Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/sys.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | */ |
| 6 | |
Paul Gortmaker | 9984de1 | 2011-05-23 14:51:41 -0400 | [diff] [blame] | 7 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/mm.h> |
| 9 | #include <linux/utsname.h> |
| 10 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/reboot.h> |
| 12 | #include <linux/prctl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/highuid.h> |
| 14 | #include <linux/fs.h> |
Paul Gortmaker | 74da1ff | 2011-05-26 12:48:41 -0400 | [diff] [blame] | 15 | #include <linux/kmod.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 16 | #include <linux/perf_event.h> |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 17 | #include <linux/resource.h> |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/kexec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/workqueue.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 21 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/device.h> |
| 23 | #include <linux/key.h> |
| 24 | #include <linux/times.h> |
| 25 | #include <linux/posix-timers.h> |
| 26 | #include <linux/security.h> |
| 27 | #include <linux/dcookies.h> |
| 28 | #include <linux/suspend.h> |
| 29 | #include <linux/tty.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 30 | #include <linux/signal.h> |
Matt Helsley | 9f46080 | 2005-11-07 00:59:16 -0800 | [diff] [blame] | 31 | #include <linux/cn_proc.h> |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 32 | #include <linux/getcpu.h> |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 33 | #include <linux/task_io_accounting_ops.h> |
Andrea Arcangeli | 1d9d02f | 2007-07-15 23:41:32 -0700 | [diff] [blame] | 34 | #include <linux/seccomp.h> |
Mark Lord | 4047727 | 2007-10-01 01:20:10 -0700 | [diff] [blame] | 35 | #include <linux/cpu.h> |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 36 | #include <linux/personality.h> |
Paul Mackerras | e3d5a27 | 2009-01-06 14:41:02 -0800 | [diff] [blame] | 37 | #include <linux/ptrace.h> |
Al Viro | 5ad4e53 | 2009-03-29 19:50:06 -0400 | [diff] [blame] | 38 | #include <linux/fs_struct.h> |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 39 | #include <linux/file.h> |
| 40 | #include <linux/mount.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/gfp.h> |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 42 | #include <linux/syscore_ops.h> |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 43 | #include <linux/version.h> |
| 44 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | #include <linux/compat.h> |
| 47 | #include <linux/syscalls.h> |
Keshavamurthy Anil S | 00d7c05 | 2005-12-12 00:37:33 -0800 | [diff] [blame] | 48 | #include <linux/kprobes.h> |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 49 | #include <linux/user_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 51 | #include <linux/kmsg_dump.h> |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 52 | /* Move somewhere else to avoid recompiling? */ |
| 53 | #include <generated/utsrelease.h> |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <asm/uaccess.h> |
| 56 | #include <asm/io.h> |
| 57 | #include <asm/unistd.h> |
| 58 | |
| 59 | #ifndef SET_UNALIGN_CTL |
| 60 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) |
| 61 | #endif |
| 62 | #ifndef GET_UNALIGN_CTL |
| 63 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) |
| 64 | #endif |
| 65 | #ifndef SET_FPEMU_CTL |
| 66 | # define SET_FPEMU_CTL(a,b) (-EINVAL) |
| 67 | #endif |
| 68 | #ifndef GET_FPEMU_CTL |
| 69 | # define GET_FPEMU_CTL(a,b) (-EINVAL) |
| 70 | #endif |
| 71 | #ifndef SET_FPEXC_CTL |
| 72 | # define SET_FPEXC_CTL(a,b) (-EINVAL) |
| 73 | #endif |
| 74 | #ifndef GET_FPEXC_CTL |
| 75 | # define GET_FPEXC_CTL(a,b) (-EINVAL) |
| 76 | #endif |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 77 | #ifndef GET_ENDIAN |
| 78 | # define GET_ENDIAN(a,b) (-EINVAL) |
| 79 | #endif |
| 80 | #ifndef SET_ENDIAN |
| 81 | # define SET_ENDIAN(a,b) (-EINVAL) |
| 82 | #endif |
Erik Bosman | 8fb402b | 2008-04-11 18:54:17 +0200 | [diff] [blame] | 83 | #ifndef GET_TSC_CTL |
| 84 | # define GET_TSC_CTL(a) (-EINVAL) |
| 85 | #endif |
| 86 | #ifndef SET_TSC_CTL |
| 87 | # define SET_TSC_CTL(a) (-EINVAL) |
| 88 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | /* |
| 91 | * this is where the system-wide overflow UID and GID are defined, for |
| 92 | * architectures that now have 32-bit UID/GID but didn't in the past |
| 93 | */ |
| 94 | |
| 95 | int overflowuid = DEFAULT_OVERFLOWUID; |
| 96 | int overflowgid = DEFAULT_OVERFLOWGID; |
| 97 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | EXPORT_SYMBOL(overflowuid); |
| 99 | EXPORT_SYMBOL(overflowgid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | /* |
| 102 | * the same as above, but for filesystems which can only store a 16-bit |
| 103 | * UID and GID. as such, this is needed on all architectures |
| 104 | */ |
| 105 | |
| 106 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; |
| 107 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; |
| 108 | |
| 109 | EXPORT_SYMBOL(fs_overflowuid); |
| 110 | EXPORT_SYMBOL(fs_overflowgid); |
| 111 | |
| 112 | /* |
| 113 | * this indicates whether you can reboot with ctrl-alt-del: the default is yes |
| 114 | */ |
| 115 | |
| 116 | int C_A_D = 1; |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 117 | struct pid *cad_pid; |
| 118 | EXPORT_SYMBOL(cad_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
| 120 | /* |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 121 | * If set, this is used for preparing the system to power off. |
| 122 | */ |
| 123 | |
| 124 | void (*pm_power_off_prepare)(void); |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 125 | |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 126 | /* |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 127 | * Returns true if current's euid is same as p's uid or euid, |
| 128 | * or has CAP_SYS_NICE to p's user_ns. |
| 129 | * |
| 130 | * Called with rcu_read_lock, creds are safe |
| 131 | */ |
| 132 | static bool set_one_prio_perm(struct task_struct *p) |
| 133 | { |
| 134 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); |
| 135 | |
Eric W. Biederman | 5af6620 | 2012-03-03 20:21:47 -0800 | [diff] [blame] | 136 | if (uid_eq(pcred->uid, cred->euid) || |
| 137 | uid_eq(pcred->euid, cred->euid)) |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 138 | return true; |
Eric W. Biederman | c4a4d60 | 2011-11-16 23:15:31 -0800 | [diff] [blame] | 139 | if (ns_capable(pcred->user_ns, CAP_SYS_NICE)) |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 140 | return true; |
| 141 | return false; |
| 142 | } |
| 143 | |
| 144 | /* |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 145 | * set the priority of a task |
| 146 | * - the caller must hold the RCU read lock |
| 147 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
| 149 | { |
| 150 | int no_nice; |
| 151 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 152 | if (!set_one_prio_perm(p)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | error = -EPERM; |
| 154 | goto out; |
| 155 | } |
Matt Mackall | e43379f | 2005-05-01 08:59:00 -0700 | [diff] [blame] | 156 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | error = -EACCES; |
| 158 | goto out; |
| 159 | } |
| 160 | no_nice = security_task_setnice(p, niceval); |
| 161 | if (no_nice) { |
| 162 | error = no_nice; |
| 163 | goto out; |
| 164 | } |
| 165 | if (error == -ESRCH) |
| 166 | error = 0; |
| 167 | set_user_nice(p, niceval); |
| 168 | out: |
| 169 | return error; |
| 170 | } |
| 171 | |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 172 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
| 174 | struct task_struct *g, *p; |
| 175 | struct user_struct *user; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 176 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | int error = -EINVAL; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 178 | struct pid *pgrp; |
Eric W. Biederman | 7b44ab9 | 2011-11-16 23:20:58 -0800 | [diff] [blame] | 179 | kuid_t uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 181 | if (which > PRIO_USER || which < PRIO_PROCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | goto out; |
| 183 | |
| 184 | /* normalize: avoid signed division (rounding problems) */ |
| 185 | error = -ESRCH; |
| 186 | if (niceval < -20) |
| 187 | niceval = -20; |
| 188 | if (niceval > 19) |
| 189 | niceval = 19; |
| 190 | |
Thomas Gleixner | d4581a2 | 2009-12-10 00:52:51 +0000 | [diff] [blame] | 191 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | read_lock(&tasklist_lock); |
| 193 | switch (which) { |
| 194 | case PRIO_PROCESS: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 195 | if (who) |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 196 | p = find_task_by_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 197 | else |
| 198 | p = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | if (p) |
| 200 | error = set_one_prio(p, niceval, error); |
| 201 | break; |
| 202 | case PRIO_PGRP: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 203 | if (who) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 204 | pgrp = find_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 205 | else |
| 206 | pgrp = task_pgrp(current); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 207 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | error = set_one_prio(p, niceval, error); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 209 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | break; |
| 211 | case PRIO_USER: |
Eric W. Biederman | 7b44ab9 | 2011-11-16 23:20:58 -0800 | [diff] [blame] | 212 | uid = make_kuid(cred->user_ns, who); |
Eric W. Biederman | 74ba508 | 2012-03-03 18:58:11 -0800 | [diff] [blame] | 213 | user = cred->user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | if (!who) |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 215 | uid = cred->uid; |
| 216 | else if (!uid_eq(uid, cred->uid) && |
Eric W. Biederman | 7b44ab9 | 2011-11-16 23:20:58 -0800 | [diff] [blame] | 217 | !(user = find_user(uid))) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 218 | goto out_unlock; /* No processes for this user */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 220 | do_each_thread(g, p) { |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 221 | if (uid_eq(task_uid(p), uid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | error = set_one_prio(p, niceval, error); |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 223 | } while_each_thread(g, p); |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 224 | if (!uid_eq(uid, cred->uid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | free_uid(user); /* For find_user() */ |
| 226 | break; |
| 227 | } |
| 228 | out_unlock: |
| 229 | read_unlock(&tasklist_lock); |
Thomas Gleixner | d4581a2 | 2009-12-10 00:52:51 +0000 | [diff] [blame] | 230 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | out: |
| 232 | return error; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * Ugh. To avoid negative return values, "getpriority()" will |
| 237 | * not return the normal nice-value, but a negated value that |
| 238 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) |
| 239 | * to stay compatible. |
| 240 | */ |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 241 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | { |
| 243 | struct task_struct *g, *p; |
| 244 | struct user_struct *user; |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 245 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | long niceval, retval = -ESRCH; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 247 | struct pid *pgrp; |
Eric W. Biederman | 7b44ab9 | 2011-11-16 23:20:58 -0800 | [diff] [blame] | 248 | kuid_t uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
Daniel Walker | 3e88c55 | 2007-05-10 22:22:53 -0700 | [diff] [blame] | 250 | if (which > PRIO_USER || which < PRIO_PROCESS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | return -EINVAL; |
| 252 | |
Tetsuo Handa | 7011883 | 2010-02-22 12:44:16 -0800 | [diff] [blame] | 253 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | read_lock(&tasklist_lock); |
| 255 | switch (which) { |
| 256 | case PRIO_PROCESS: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 257 | if (who) |
Pavel Emelyanov | 228ebcb | 2007-10-18 23:40:16 -0700 | [diff] [blame] | 258 | p = find_task_by_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 259 | else |
| 260 | p = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (p) { |
| 262 | niceval = 20 - task_nice(p); |
| 263 | if (niceval > retval) |
| 264 | retval = niceval; |
| 265 | } |
| 266 | break; |
| 267 | case PRIO_PGRP: |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 268 | if (who) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 269 | pgrp = find_vpid(who); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 270 | else |
| 271 | pgrp = task_pgrp(current); |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 272 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | niceval = 20 - task_nice(p); |
| 274 | if (niceval > retval) |
| 275 | retval = niceval; |
Ken Chen | 2d70b68 | 2008-08-20 14:09:17 -0700 | [diff] [blame] | 276 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | break; |
| 278 | case PRIO_USER: |
Eric W. Biederman | 7b44ab9 | 2011-11-16 23:20:58 -0800 | [diff] [blame] | 279 | uid = make_kuid(cred->user_ns, who); |
Eric W. Biederman | 74ba508 | 2012-03-03 18:58:11 -0800 | [diff] [blame] | 280 | user = cred->user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | if (!who) |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 282 | uid = cred->uid; |
| 283 | else if (!uid_eq(uid, cred->uid) && |
Eric W. Biederman | 7b44ab9 | 2011-11-16 23:20:58 -0800 | [diff] [blame] | 284 | !(user = find_user(uid))) |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 285 | goto out_unlock; /* No processes for this user */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 287 | do_each_thread(g, p) { |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 288 | if (uid_eq(task_uid(p), uid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | niceval = 20 - task_nice(p); |
| 290 | if (niceval > retval) |
| 291 | retval = niceval; |
| 292 | } |
H Hartley Sweeten | dfc6a73 | 2009-12-14 18:00:22 -0800 | [diff] [blame] | 293 | } while_each_thread(g, p); |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 294 | if (!uid_eq(uid, cred->uid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | free_uid(user); /* for find_user() */ |
| 296 | break; |
| 297 | } |
| 298 | out_unlock: |
| 299 | read_unlock(&tasklist_lock); |
Tetsuo Handa | 7011883 | 2010-02-22 12:44:16 -0800 | [diff] [blame] | 300 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | return retval; |
| 303 | } |
| 304 | |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 305 | /** |
| 306 | * emergency_restart - reboot the system |
| 307 | * |
| 308 | * Without shutting down any hardware or taking any locks |
| 309 | * reboot the system. This is called when we know we are in |
| 310 | * trouble so this is our best effort to reboot. This is |
| 311 | * safe to call in interrupt context. |
| 312 | */ |
Eric W. Biederman | 7c90347 | 2005-07-26 11:29:55 -0600 | [diff] [blame] | 313 | void emergency_restart(void) |
| 314 | { |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 315 | kmsg_dump(KMSG_DUMP_EMERG); |
Eric W. Biederman | 7c90347 | 2005-07-26 11:29:55 -0600 | [diff] [blame] | 316 | machine_emergency_restart(); |
| 317 | } |
| 318 | EXPORT_SYMBOL_GPL(emergency_restart); |
| 319 | |
Huang Ying | ca195b7 | 2008-08-15 00:40:24 -0700 | [diff] [blame] | 320 | void kernel_restart_prepare(char *cmd) |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 321 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 322 | blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 323 | system_state = SYSTEM_RESTART; |
Kay Sievers | b50fa7c | 2011-05-05 13:32:05 +0200 | [diff] [blame] | 324 | usermodehelper_disable(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 325 | device_shutdown(); |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 326 | syscore_shutdown(); |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 327 | } |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 328 | |
| 329 | /** |
Amerigo Wang | c5f4175 | 2011-07-25 17:13:10 -0700 | [diff] [blame] | 330 | * register_reboot_notifier - Register function to be called at reboot time |
| 331 | * @nb: Info about notifier function to be called |
| 332 | * |
| 333 | * Registers a function with the list of functions |
| 334 | * to be called at reboot time. |
| 335 | * |
| 336 | * Currently always returns zero, as blocking_notifier_chain_register() |
| 337 | * always returns zero. |
| 338 | */ |
| 339 | int register_reboot_notifier(struct notifier_block *nb) |
| 340 | { |
| 341 | return blocking_notifier_chain_register(&reboot_notifier_list, nb); |
| 342 | } |
| 343 | EXPORT_SYMBOL(register_reboot_notifier); |
| 344 | |
| 345 | /** |
| 346 | * unregister_reboot_notifier - Unregister previously registered reboot notifier |
| 347 | * @nb: Hook to be unregistered |
| 348 | * |
| 349 | * Unregisters a previously registered reboot |
| 350 | * notifier function. |
| 351 | * |
| 352 | * Returns zero on success, or %-ENOENT on failure. |
| 353 | */ |
| 354 | int unregister_reboot_notifier(struct notifier_block *nb) |
| 355 | { |
| 356 | return blocking_notifier_chain_unregister(&reboot_notifier_list, nb); |
| 357 | } |
| 358 | EXPORT_SYMBOL(unregister_reboot_notifier); |
| 359 | |
| 360 | /** |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 361 | * kernel_restart - reboot the system |
| 362 | * @cmd: pointer to buffer containing command to execute for restart |
Randy Dunlap | b8887e6 | 2005-11-07 01:01:07 -0800 | [diff] [blame] | 363 | * or %NULL |
Randy Dunlap | 1e5d533 | 2005-11-07 01:01:06 -0800 | [diff] [blame] | 364 | * |
| 365 | * Shutdown everything and perform a clean reboot. |
| 366 | * This is not safe to call in interrupt context. |
| 367 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 368 | void kernel_restart(char *cmd) |
| 369 | { |
| 370 | kernel_restart_prepare(cmd); |
Shawn Guo | f96972f | 2012-10-04 17:12:23 -0700 | [diff] [blame] | 371 | disable_nonboot_cpus(); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 372 | if (!cmd) |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 373 | printk(KERN_EMERG "Restarting system.\n"); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 374 | else |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 375 | printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd); |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 376 | kmsg_dump(KMSG_DUMP_RESTART); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 377 | machine_restart(cmd); |
| 378 | } |
| 379 | EXPORT_SYMBOL_GPL(kernel_restart); |
| 380 | |
Adrian Bunk | 4ef7229 | 2008-02-04 22:30:06 -0800 | [diff] [blame] | 381 | static void kernel_shutdown_prepare(enum system_states state) |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 382 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 383 | blocking_notifier_call_chain(&reboot_notifier_list, |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 384 | (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); |
| 385 | system_state = state; |
Kay Sievers | b50fa7c | 2011-05-05 13:32:05 +0200 | [diff] [blame] | 386 | usermodehelper_disable(); |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 387 | device_shutdown(); |
| 388 | } |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 389 | /** |
| 390 | * kernel_halt - halt the system |
| 391 | * |
| 392 | * Shutdown everything and perform a clean system halt. |
| 393 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 394 | void kernel_halt(void) |
| 395 | { |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 396 | kernel_shutdown_prepare(SYSTEM_HALT); |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 397 | syscore_shutdown(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 398 | printk(KERN_EMERG "System halted.\n"); |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 399 | kmsg_dump(KMSG_DUMP_HALT); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 400 | machine_halt(); |
| 401 | } |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 402 | |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 403 | EXPORT_SYMBOL_GPL(kernel_halt); |
| 404 | |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 405 | /** |
| 406 | * kernel_power_off - power_off the system |
| 407 | * |
| 408 | * Shutdown everything and perform a clean system power_off. |
| 409 | */ |
Eric W. Biederman | e4c9433 | 2005-09-22 21:43:45 -0700 | [diff] [blame] | 410 | void kernel_power_off(void) |
| 411 | { |
Alexey Starikovskiy | 729b4d4 | 2005-12-01 04:29:00 -0500 | [diff] [blame] | 412 | kernel_shutdown_prepare(SYSTEM_POWER_OFF); |
Rafael J. Wysocki | bd804eb | 2007-07-19 01:47:40 -0700 | [diff] [blame] | 413 | if (pm_power_off_prepare) |
| 414 | pm_power_off_prepare(); |
Mark Lord | 4047727 | 2007-10-01 01:20:10 -0700 | [diff] [blame] | 415 | disable_nonboot_cpus(); |
Rafael J. Wysocki | 40dc166 | 2011-03-15 00:43:46 +0100 | [diff] [blame] | 416 | syscore_shutdown(); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 417 | printk(KERN_EMERG "Power down.\n"); |
Seiji Aguchi | 04c6862 | 2011-01-12 16:59:30 -0800 | [diff] [blame] | 418 | kmsg_dump(KMSG_DUMP_POWEROFF); |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 419 | machine_power_off(); |
| 420 | } |
| 421 | EXPORT_SYMBOL_GPL(kernel_power_off); |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 422 | |
| 423 | static DEFINE_MUTEX(reboot_mutex); |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | /* |
| 426 | * Reboot system call: for obvious reasons only root may call it, |
| 427 | * and even root needs to set up some magic numbers in the registers |
| 428 | * so that some mistake won't make this reboot the whole machine. |
| 429 | * You can also set the meaning of the ctrl-alt-del-key here. |
| 430 | * |
| 431 | * reboot doesn't sync: do that yourself before calling this. |
| 432 | */ |
Heiko Carstens | 754fe8d | 2009-01-14 14:14:09 +0100 | [diff] [blame] | 433 | SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd, |
| 434 | void __user *, arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
| 436 | char buffer[256]; |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 437 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | /* We only trust the superuser with rebooting the system. */ |
| 440 | if (!capable(CAP_SYS_BOOT)) |
| 441 | return -EPERM; |
| 442 | |
| 443 | /* For safety, we require "magic" arguments. */ |
| 444 | if (magic1 != LINUX_REBOOT_MAGIC1 || |
| 445 | (magic2 != LINUX_REBOOT_MAGIC2 && |
| 446 | magic2 != LINUX_REBOOT_MAGIC2A && |
| 447 | magic2 != LINUX_REBOOT_MAGIC2B && |
| 448 | magic2 != LINUX_REBOOT_MAGIC2C)) |
| 449 | return -EINVAL; |
| 450 | |
Daniel Lezcano | cf3f892 | 2012-03-28 14:42:51 -0700 | [diff] [blame] | 451 | /* |
| 452 | * If pid namespaces are enabled and the current task is in a child |
| 453 | * pid_namespace, the command is handled by reboot_pid_ns() which will |
| 454 | * call do_exit(). |
| 455 | */ |
| 456 | ret = reboot_pid_ns(task_active_pid_ns(current), cmd); |
| 457 | if (ret) |
| 458 | return ret; |
| 459 | |
Eric W. Biederman | 5e38291 | 2006-01-08 01:03:46 -0800 | [diff] [blame] | 460 | /* Instead of trying to make the power_off code look like |
| 461 | * halt when pm_power_off is not set do it the easy way. |
| 462 | */ |
| 463 | if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off) |
| 464 | cmd = LINUX_REBOOT_CMD_HALT; |
| 465 | |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 466 | mutex_lock(&reboot_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | switch (cmd) { |
| 468 | case LINUX_REBOOT_CMD_RESTART: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 469 | kernel_restart(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | break; |
| 471 | |
| 472 | case LINUX_REBOOT_CMD_CAD_ON: |
| 473 | C_A_D = 1; |
| 474 | break; |
| 475 | |
| 476 | case LINUX_REBOOT_CMD_CAD_OFF: |
| 477 | C_A_D = 0; |
| 478 | break; |
| 479 | |
| 480 | case LINUX_REBOOT_CMD_HALT: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 481 | kernel_halt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | do_exit(0); |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 483 | panic("cannot halt"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
| 485 | case LINUX_REBOOT_CMD_POWER_OFF: |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 486 | kernel_power_off(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | do_exit(0); |
| 488 | break; |
| 489 | |
| 490 | case LINUX_REBOOT_CMD_RESTART2: |
| 491 | if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) { |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 492 | ret = -EFAULT; |
| 493 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | buffer[sizeof(buffer) - 1] = '\0'; |
| 496 | |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 497 | kernel_restart(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | break; |
| 499 | |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 500 | #ifdef CONFIG_KEXEC |
Eric W. Biederman | dc009d9 | 2005-06-25 14:57:52 -0700 | [diff] [blame] | 501 | case LINUX_REBOOT_CMD_KEXEC: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 502 | ret = kernel_kexec(); |
| 503 | break; |
Huang Ying | 3ab8352 | 2008-07-25 19:45:07 -0700 | [diff] [blame] | 504 | #endif |
Eric W. Biederman | 4a00ea1 | 2005-07-26 11:24:14 -0600 | [diff] [blame] | 505 | |
Rafael J. Wysocki | b0cb1a1 | 2007-07-29 23:24:36 +0200 | [diff] [blame] | 506 | #ifdef CONFIG_HIBERNATION |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | case LINUX_REBOOT_CMD_SW_SUSPEND: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 508 | ret = hibernate(); |
| 509 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | #endif |
| 511 | |
| 512 | default: |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 513 | ret = -EINVAL; |
| 514 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
Thomas Gleixner | 6f15fa5 | 2009-10-09 20:31:33 +0200 | [diff] [blame] | 516 | mutex_unlock(&reboot_mutex); |
Andi Kleen | 3d26dcf | 2009-04-13 14:40:08 -0700 | [diff] [blame] | 517 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | } |
| 519 | |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 520 | static void deferred_cad(struct work_struct *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | { |
Eric W. Biederman | abcd9e5 | 2005-07-26 11:27:34 -0600 | [diff] [blame] | 522 | kernel_restart(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | } |
| 524 | |
| 525 | /* |
| 526 | * This function gets called by ctrl-alt-del - ie the keyboard interrupt. |
| 527 | * As it's called within an interrupt, it may NOT sync: the only choice |
| 528 | * is whether to reboot at once, or just ignore the ctrl-alt-del. |
| 529 | */ |
| 530 | void ctrl_alt_del(void) |
| 531 | { |
David Howells | 65f27f3 | 2006-11-22 14:55:48 +0000 | [diff] [blame] | 532 | static DECLARE_WORK(cad_work, deferred_cad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
| 534 | if (C_A_D) |
| 535 | schedule_work(&cad_work); |
| 536 | else |
Cedric Le Goater | 9ec5209 | 2006-10-02 02:19:00 -0700 | [diff] [blame] | 537 | kill_cad_pid(SIGINT, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | /* |
| 541 | * Unprivileged users may change the real gid to the effective gid |
| 542 | * or vice versa. (BSD-style) |
| 543 | * |
| 544 | * If you set the real gid at all, or set the effective gid to a value not |
| 545 | * equal to the real gid, then the saved gid is set to the new effective gid. |
| 546 | * |
| 547 | * This makes it possible for a setgid program to completely drop its |
| 548 | * privileges, which is often a useful assertion to make when you are doing |
| 549 | * a security audit over a program. |
| 550 | * |
| 551 | * The general idea is that a program which uses just setregid() will be |
| 552 | * 100% compatible with BSD. A program which uses just setgid() will be |
| 553 | * 100% compatible with POSIX with saved IDs. |
| 554 | * |
| 555 | * SMP: There are not races, the GIDs are checked only by filesystem |
| 556 | * operations (as far as semantic preservation is concerned). |
| 557 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 558 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 560 | struct user_namespace *ns = current_user_ns(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 561 | const struct cred *old; |
| 562 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 564 | kgid_t krgid, kegid; |
| 565 | |
| 566 | krgid = make_kgid(ns, rgid); |
| 567 | kegid = make_kgid(ns, egid); |
| 568 | |
| 569 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) |
| 570 | return -EINVAL; |
| 571 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) |
| 572 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 574 | new = prepare_creds(); |
| 575 | if (!new) |
| 576 | return -ENOMEM; |
| 577 | old = current_cred(); |
| 578 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 579 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (rgid != (gid_t) -1) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 581 | if (gid_eq(old->gid, krgid) || |
| 582 | gid_eq(old->egid, krgid) || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 583 | nsown_capable(CAP_SETGID)) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 584 | new->gid = krgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 586 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } |
| 588 | if (egid != (gid_t) -1) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 589 | if (gid_eq(old->gid, kegid) || |
| 590 | gid_eq(old->egid, kegid) || |
| 591 | gid_eq(old->sgid, kegid) || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 592 | nsown_capable(CAP_SETGID)) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 593 | new->egid = kegid; |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 594 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 595 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 597 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | if (rgid != (gid_t) -1 || |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 599 | (egid != (gid_t) -1 && !gid_eq(kegid, old->gid))) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 600 | new->sgid = new->egid; |
| 601 | new->fsgid = new->egid; |
| 602 | |
| 603 | return commit_creds(new); |
| 604 | |
| 605 | error: |
| 606 | abort_creds(new); |
| 607 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
| 610 | /* |
| 611 | * setgid() is implemented like SysV w/ SAVED_IDS |
| 612 | * |
| 613 | * SMP: Same implicit races as above. |
| 614 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 615 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 617 | struct user_namespace *ns = current_user_ns(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 618 | const struct cred *old; |
| 619 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 621 | kgid_t kgid; |
| 622 | |
| 623 | kgid = make_kgid(ns, gid); |
| 624 | if (!gid_valid(kgid)) |
| 625 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 627 | new = prepare_creds(); |
| 628 | if (!new) |
| 629 | return -ENOMEM; |
| 630 | old = current_cred(); |
| 631 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 632 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 633 | if (nsown_capable(CAP_SETGID)) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 634 | new->gid = new->egid = new->sgid = new->fsgid = kgid; |
| 635 | else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid)) |
| 636 | new->egid = new->fsgid = kgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 638 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 640 | return commit_creds(new); |
| 641 | |
| 642 | error: |
| 643 | abort_creds(new); |
| 644 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 646 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 647 | /* |
| 648 | * change the user struct in a credentials set to match the new UID |
| 649 | */ |
| 650 | static int set_user(struct cred *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | { |
| 652 | struct user_struct *new_user; |
| 653 | |
Eric W. Biederman | 078de5f | 2012-02-08 07:00:08 -0800 | [diff] [blame] | 654 | new_user = alloc_uid(new->uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | if (!new_user) |
| 656 | return -EAGAIN; |
| 657 | |
Vasiliy Kulikov | 72fa599 | 2011-08-08 19:02:04 +0400 | [diff] [blame] | 658 | /* |
| 659 | * We don't fail in case of NPROC limit excess here because too many |
| 660 | * poorly written programs don't check set*uid() return code, assuming |
| 661 | * it never fails if called by root. We may still enforce NPROC limit |
| 662 | * for programs doing set*uid()+execve() by harmlessly deferring the |
| 663 | * failure to the execve() stage. |
| 664 | */ |
Jiri Slaby | 78d7d40 | 2010-03-05 13:42:54 -0800 | [diff] [blame] | 665 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
Vasiliy Kulikov | 72fa599 | 2011-08-08 19:02:04 +0400 | [diff] [blame] | 666 | new_user != INIT_USER) |
| 667 | current->flags |= PF_NPROC_EXCEEDED; |
| 668 | else |
| 669 | current->flags &= ~PF_NPROC_EXCEEDED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 671 | free_uid(new->user); |
| 672 | new->user = new_user; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | return 0; |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | * Unprivileged users may change the real uid to the effective uid |
| 678 | * or vice versa. (BSD-style) |
| 679 | * |
| 680 | * If you set the real uid at all, or set the effective uid to a value not |
| 681 | * equal to the real uid, then the saved uid is set to the new effective uid. |
| 682 | * |
| 683 | * This makes it possible for a setuid program to completely drop its |
| 684 | * privileges, which is often a useful assertion to make when you are doing |
| 685 | * a security audit over a program. |
| 686 | * |
| 687 | * The general idea is that a program which uses just setreuid() will be |
| 688 | * 100% compatible with BSD. A program which uses just setuid() will be |
| 689 | * 100% compatible with POSIX with saved IDs. |
| 690 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 691 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 693 | struct user_namespace *ns = current_user_ns(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 694 | const struct cred *old; |
| 695 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 697 | kuid_t kruid, keuid; |
| 698 | |
| 699 | kruid = make_kuid(ns, ruid); |
| 700 | keuid = make_kuid(ns, euid); |
| 701 | |
| 702 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) |
| 703 | return -EINVAL; |
| 704 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) |
| 705 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 707 | new = prepare_creds(); |
| 708 | if (!new) |
| 709 | return -ENOMEM; |
| 710 | old = current_cred(); |
| 711 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 712 | retval = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | if (ruid != (uid_t) -1) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 714 | new->uid = kruid; |
| 715 | if (!uid_eq(old->uid, kruid) && |
| 716 | !uid_eq(old->euid, kruid) && |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 717 | !nsown_capable(CAP_SETUID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 718 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | } |
| 720 | |
| 721 | if (euid != (uid_t) -1) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 722 | new->euid = keuid; |
| 723 | if (!uid_eq(old->uid, keuid) && |
| 724 | !uid_eq(old->euid, keuid) && |
| 725 | !uid_eq(old->suid, keuid) && |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 726 | !nsown_capable(CAP_SETUID)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 727 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } |
| 729 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 730 | if (!uid_eq(new->uid, old->uid)) { |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 731 | retval = set_user(new); |
| 732 | if (retval < 0) |
| 733 | goto error; |
| 734 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | if (ruid != (uid_t) -1 || |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 736 | (euid != (uid_t) -1 && !uid_eq(keuid, old->uid))) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 737 | new->suid = new->euid; |
| 738 | new->fsuid = new->euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 740 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
| 741 | if (retval < 0) |
| 742 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 744 | return commit_creds(new); |
| 745 | |
| 746 | error: |
| 747 | abort_creds(new); |
| 748 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
| 751 | /* |
| 752 | * setuid() is implemented like SysV with SAVED_IDS |
| 753 | * |
| 754 | * Note that SAVED_ID's is deficient in that a setuid root program |
| 755 | * like sendmail, for example, cannot set its uid to be a normal |
| 756 | * user and then switch back, because if you're root, setuid() sets |
| 757 | * the saved uid too. If you don't like this, blame the bright people |
| 758 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() |
| 759 | * will allow a root program to temporarily drop privileges and be able to |
| 760 | * regain them by swapping the real and effective uid. |
| 761 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 762 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 764 | struct user_namespace *ns = current_user_ns(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 765 | const struct cred *old; |
| 766 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 768 | kuid_t kuid; |
| 769 | |
| 770 | kuid = make_kuid(ns, uid); |
| 771 | if (!uid_valid(kuid)) |
| 772 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 774 | new = prepare_creds(); |
| 775 | if (!new) |
| 776 | return -ENOMEM; |
| 777 | old = current_cred(); |
| 778 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 779 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 780 | if (nsown_capable(CAP_SETUID)) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 781 | new->suid = new->uid = kuid; |
| 782 | if (!uid_eq(kuid, old->uid)) { |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 783 | retval = set_user(new); |
| 784 | if (retval < 0) |
| 785 | goto error; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 786 | } |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 787 | } else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 788 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 791 | new->fsuid = new->euid = kuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 793 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); |
| 794 | if (retval < 0) |
| 795 | goto error; |
| 796 | |
| 797 | return commit_creds(new); |
| 798 | |
| 799 | error: |
| 800 | abort_creds(new); |
| 801 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } |
| 803 | |
| 804 | |
| 805 | /* |
| 806 | * This function implements a generic ability to update ruid, euid, |
| 807 | * and suid. This allows you to implement the 4.4 compatible seteuid(). |
| 808 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 809 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 811 | struct user_namespace *ns = current_user_ns(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 812 | const struct cred *old; |
| 813 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 815 | kuid_t kruid, keuid, ksuid; |
| 816 | |
| 817 | kruid = make_kuid(ns, ruid); |
| 818 | keuid = make_kuid(ns, euid); |
| 819 | ksuid = make_kuid(ns, suid); |
| 820 | |
| 821 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) |
| 822 | return -EINVAL; |
| 823 | |
| 824 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) |
| 825 | return -EINVAL; |
| 826 | |
| 827 | if ((suid != (uid_t) -1) && !uid_valid(ksuid)) |
| 828 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 830 | new = prepare_creds(); |
| 831 | if (!new) |
| 832 | return -ENOMEM; |
| 833 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 834 | old = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 836 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 837 | if (!nsown_capable(CAP_SETUID)) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 838 | if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) && |
| 839 | !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 840 | goto error; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 841 | if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) && |
| 842 | !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 843 | goto error; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 844 | if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) && |
| 845 | !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 846 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | if (ruid != (uid_t) -1) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 850 | new->uid = kruid; |
| 851 | if (!uid_eq(kruid, old->uid)) { |
Dhaval Giani | 54e9912 | 2009-02-27 15:13:54 +0530 | [diff] [blame] | 852 | retval = set_user(new); |
| 853 | if (retval < 0) |
| 854 | goto error; |
| 855 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 857 | if (euid != (uid_t) -1) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 858 | new->euid = keuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | if (suid != (uid_t) -1) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 860 | new->suid = ksuid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 861 | new->fsuid = new->euid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 863 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
| 864 | if (retval < 0) |
| 865 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 867 | return commit_creds(new); |
| 868 | |
| 869 | error: |
| 870 | abort_creds(new); |
| 871 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | } |
| 873 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 874 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 876 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 878 | uid_t ruid, euid, suid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 880 | ruid = from_kuid_munged(cred->user_ns, cred->uid); |
| 881 | euid = from_kuid_munged(cred->user_ns, cred->euid); |
| 882 | suid = from_kuid_munged(cred->user_ns, cred->suid); |
| 883 | |
| 884 | if (!(retval = put_user(ruid, ruidp)) && |
| 885 | !(retval = put_user(euid, euidp))) |
| 886 | retval = put_user(suid, suidp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
| 888 | return retval; |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * Same as above, but for rgid, egid, sgid. |
| 893 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 894 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 896 | struct user_namespace *ns = current_user_ns(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 897 | const struct cred *old; |
| 898 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 900 | kgid_t krgid, kegid, ksgid; |
| 901 | |
| 902 | krgid = make_kgid(ns, rgid); |
| 903 | kegid = make_kgid(ns, egid); |
| 904 | ksgid = make_kgid(ns, sgid); |
| 905 | |
| 906 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) |
| 907 | return -EINVAL; |
| 908 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) |
| 909 | return -EINVAL; |
| 910 | if ((sgid != (gid_t) -1) && !gid_valid(ksgid)) |
| 911 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 913 | new = prepare_creds(); |
| 914 | if (!new) |
| 915 | return -ENOMEM; |
| 916 | old = current_cred(); |
| 917 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 918 | retval = -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 919 | if (!nsown_capable(CAP_SETGID)) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 920 | if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) && |
| 921 | !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 922 | goto error; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 923 | if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) && |
| 924 | !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 925 | goto error; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 926 | if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) && |
| 927 | !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid)) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 928 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 931 | if (rgid != (gid_t) -1) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 932 | new->gid = krgid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 933 | if (egid != (gid_t) -1) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 934 | new->egid = kegid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 935 | if (sgid != (gid_t) -1) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 936 | new->sgid = ksgid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 937 | new->fsgid = new->egid; |
| 938 | |
| 939 | return commit_creds(new); |
| 940 | |
| 941 | error: |
| 942 | abort_creds(new); |
| 943 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 946 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 948 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | int retval; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 950 | gid_t rgid, egid, sgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 952 | rgid = from_kgid_munged(cred->user_ns, cred->gid); |
| 953 | egid = from_kgid_munged(cred->user_ns, cred->egid); |
| 954 | sgid = from_kgid_munged(cred->user_ns, cred->sgid); |
| 955 | |
| 956 | if (!(retval = put_user(rgid, rgidp)) && |
| 957 | !(retval = put_user(egid, egidp))) |
| 958 | retval = put_user(sgid, sgidp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
| 960 | return retval; |
| 961 | } |
| 962 | |
| 963 | |
| 964 | /* |
| 965 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This |
| 966 | * is used for "access()" and for the NFS daemon (letting nfsd stay at |
| 967 | * whatever uid it wants to). It normally shadows "euid", except when |
| 968 | * explicitly set by setfsuid() or for access.. |
| 969 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 970 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 972 | const struct cred *old; |
| 973 | struct cred *new; |
| 974 | uid_t old_fsuid; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 975 | kuid_t kuid; |
| 976 | |
| 977 | old = current_cred(); |
| 978 | old_fsuid = from_kuid_munged(old->user_ns, old->fsuid); |
| 979 | |
| 980 | kuid = make_kuid(old->user_ns, uid); |
| 981 | if (!uid_valid(kuid)) |
| 982 | return old_fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 984 | new = prepare_creds(); |
| 985 | if (!new) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 986 | return old_fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 988 | if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) || |
| 989 | uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 990 | nsown_capable(CAP_SETUID)) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 991 | if (!uid_eq(kuid, old->fsuid)) { |
| 992 | new->fsuid = kuid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 993 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) |
| 994 | goto change_okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
| 997 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 998 | abort_creds(new); |
| 999 | return old_fsuid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1001 | change_okay: |
| 1002 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | return old_fsuid; |
| 1004 | } |
| 1005 | |
| 1006 | /* |
John Anthony Kazos Jr | f42df9e | 2007-05-09 08:23:08 +0200 | [diff] [blame] | 1007 | * Samma på svenska.. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | */ |
Heiko Carstens | ae1251a | 2009-01-14 14:14:05 +0100 | [diff] [blame] | 1009 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1011 | const struct cred *old; |
| 1012 | struct cred *new; |
| 1013 | gid_t old_fsgid; |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 1014 | kgid_t kgid; |
| 1015 | |
| 1016 | old = current_cred(); |
| 1017 | old_fsgid = from_kgid_munged(old->user_ns, old->fsgid); |
| 1018 | |
| 1019 | kgid = make_kgid(old->user_ns, gid); |
| 1020 | if (!gid_valid(kgid)) |
| 1021 | return old_fsgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1023 | new = prepare_creds(); |
| 1024 | if (!new) |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 1025 | return old_fsgid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1026 | |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 1027 | if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) || |
| 1028 | gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) || |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1029 | nsown_capable(CAP_SETGID)) { |
Eric W. Biederman | a29c33f | 2012-02-07 18:51:01 -0800 | [diff] [blame] | 1030 | if (!gid_eq(kgid, old->fsgid)) { |
| 1031 | new->fsgid = kgid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1032 | goto change_okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1035 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1036 | abort_creds(new); |
| 1037 | return old_fsgid; |
| 1038 | |
| 1039 | change_okay: |
| 1040 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | return old_fsgid; |
| 1042 | } |
| 1043 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1044 | void do_sys_times(struct tms *tms) |
| 1045 | { |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1046 | cputime_t tgutime, tgstime, cutime, cstime; |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1047 | |
Oleg Nesterov | 2b5fe6d | 2008-11-17 15:40:08 +0100 | [diff] [blame] | 1048 | spin_lock_irq(¤t->sighand->siglock); |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1049 | thread_group_times(current, &tgutime, &tgstime); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1050 | cutime = current->signal->cutime; |
| 1051 | cstime = current->signal->cstime; |
| 1052 | spin_unlock_irq(¤t->sighand->siglock); |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1053 | tms->tms_utime = cputime_to_clock_t(tgutime); |
| 1054 | tms->tms_stime = cputime_to_clock_t(tgstime); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1055 | tms->tms_cutime = cputime_to_clock_t(cutime); |
| 1056 | tms->tms_cstime = cputime_to_clock_t(cstime); |
| 1057 | } |
| 1058 | |
Heiko Carstens | 58fd3aa | 2009-01-14 14:14:03 +0100 | [diff] [blame] | 1059 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | if (tbuf) { |
| 1062 | struct tms tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1064 | do_sys_times(&tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
| 1066 | return -EFAULT; |
| 1067 | } |
Paul Mackerras | e3d5a27 | 2009-01-06 14:41:02 -0800 | [diff] [blame] | 1068 | force_successful_syscall_return(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
| 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * This needs some heavy checking ... |
| 1074 | * I just haven't the stomach for it. I also don't fully |
| 1075 | * understand sessions/pgrp etc. Let somebody who does explain it. |
| 1076 | * |
| 1077 | * OK, I think I have the protection semantics right.... this is really |
| 1078 | * only important on a multi-user system anyway, to make sure one user |
| 1079 | * can't send a signal to a process owned by another. -TYT, 12/12/91 |
| 1080 | * |
| 1081 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. |
| 1082 | * LBT 04.03.94 |
| 1083 | */ |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 1084 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | { |
| 1086 | struct task_struct *p; |
Oleg Nesterov | ee0acf9 | 2006-01-08 01:03:53 -0800 | [diff] [blame] | 1087 | struct task_struct *group_leader = current->group_leader; |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1088 | struct pid *pgrp; |
| 1089 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
| 1091 | if (!pid) |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1092 | pid = task_pid_vnr(group_leader); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | if (!pgid) |
| 1094 | pgid = pid; |
| 1095 | if (pgid < 0) |
| 1096 | return -EINVAL; |
Paul E. McKenney | 950eaac | 2010-08-31 17:00:18 -0700 | [diff] [blame] | 1097 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | |
| 1099 | /* From this point forward we keep holding onto the tasklist lock |
| 1100 | * so that our parent does not change from under us. -DaveM |
| 1101 | */ |
| 1102 | write_lock_irq(&tasklist_lock); |
| 1103 | |
| 1104 | err = -ESRCH; |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1105 | p = find_task_by_vpid(pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | if (!p) |
| 1107 | goto out; |
| 1108 | |
| 1109 | err = -EINVAL; |
| 1110 | if (!thread_group_leader(p)) |
| 1111 | goto out; |
| 1112 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1113 | if (same_thread_group(p->real_parent, group_leader)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | err = -EPERM; |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 1115 | if (task_session(p) != task_session(group_leader)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | goto out; |
| 1117 | err = -EACCES; |
| 1118 | if (p->did_exec) |
| 1119 | goto out; |
| 1120 | } else { |
| 1121 | err = -ESRCH; |
Oleg Nesterov | ee0acf9 | 2006-01-08 01:03:53 -0800 | [diff] [blame] | 1122 | if (p != group_leader) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | goto out; |
| 1124 | } |
| 1125 | |
| 1126 | err = -EPERM; |
| 1127 | if (p->signal->leader) |
| 1128 | goto out; |
| 1129 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1130 | pgrp = task_pid(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | if (pgid != pid) { |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1132 | struct task_struct *g; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | |
Oleg Nesterov | 4e02130 | 2008-02-08 04:19:08 -0800 | [diff] [blame] | 1134 | pgrp = find_vpid(pgid); |
| 1135 | g = pid_task(pgrp, PIDTYPE_PGID); |
Eric W. Biederman | 41487c6 | 2007-02-12 00:53:01 -0800 | [diff] [blame] | 1136 | if (!g || task_session(g) != task_session(group_leader)) |
Oleg Nesterov | f020bc4 | 2006-12-08 02:38:02 -0800 | [diff] [blame] | 1137 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | } |
| 1139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | err = security_task_setpgid(p, pgid); |
| 1141 | if (err) |
| 1142 | goto out; |
| 1143 | |
Oleg Nesterov | 1b0f7ffd | 2009-04-02 16:58:39 -0700 | [diff] [blame] | 1144 | if (task_pgrp(p) != pgrp) |
Oleg Nesterov | 83beaf3 | 2008-04-30 00:54:27 -0700 | [diff] [blame] | 1145 | change_pid(p, PIDTYPE_PGID, pgrp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | |
| 1147 | err = 0; |
| 1148 | out: |
| 1149 | /* All paths lead to here, thus we are safe. -DaveM */ |
| 1150 | write_unlock_irq(&tasklist_lock); |
Paul E. McKenney | 950eaac | 2010-08-31 17:00:18 -0700 | [diff] [blame] | 1151 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | return err; |
| 1153 | } |
| 1154 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1155 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | { |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1157 | struct task_struct *p; |
| 1158 | struct pid *grp; |
| 1159 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1161 | rcu_read_lock(); |
| 1162 | if (!pid) |
| 1163 | grp = task_pgrp(current); |
| 1164 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | retval = -ESRCH; |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1166 | p = find_task_by_vpid(pid); |
| 1167 | if (!p) |
| 1168 | goto out; |
| 1169 | grp = task_pgrp(p); |
| 1170 | if (!grp) |
| 1171 | goto out; |
| 1172 | |
| 1173 | retval = security_task_getpgid(p); |
| 1174 | if (retval) |
| 1175 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | } |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1177 | retval = pid_vnr(grp); |
| 1178 | out: |
| 1179 | rcu_read_unlock(); |
| 1180 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | } |
| 1182 | |
| 1183 | #ifdef __ARCH_WANT_SYS_GETPGRP |
| 1184 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1185 | SYSCALL_DEFINE0(getpgrp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | { |
Oleg Nesterov | 12a3de0a | 2008-04-30 00:54:29 -0700 | [diff] [blame] | 1187 | return sys_getpgid(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | } |
| 1189 | |
| 1190 | #endif |
| 1191 | |
Heiko Carstens | dbf040d | 2009-01-14 14:14:04 +0100 | [diff] [blame] | 1192 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | { |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1194 | struct task_struct *p; |
| 1195 | struct pid *sid; |
| 1196 | int retval; |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1197 | |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1198 | rcu_read_lock(); |
| 1199 | if (!pid) |
| 1200 | sid = task_session(current); |
| 1201 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | retval = -ESRCH; |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1203 | p = find_task_by_vpid(pid); |
| 1204 | if (!p) |
| 1205 | goto out; |
| 1206 | sid = task_session(p); |
| 1207 | if (!sid) |
| 1208 | goto out; |
| 1209 | |
| 1210 | retval = security_task_getsid(p); |
| 1211 | if (retval) |
| 1212 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | } |
Oleg Nesterov | 1dd768c0 | 2008-04-30 00:54:28 -0700 | [diff] [blame] | 1214 | retval = pid_vnr(sid); |
| 1215 | out: |
| 1216 | rcu_read_unlock(); |
| 1217 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | } |
| 1219 | |
Heiko Carstens | b290ebe | 2009-01-14 14:14:06 +0100 | [diff] [blame] | 1220 | SYSCALL_DEFINE0(setsid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | { |
Oren Laadan | e19f247 | 2006-01-08 01:03:58 -0800 | [diff] [blame] | 1222 | struct task_struct *group_leader = current->group_leader; |
Oleg Nesterov | e4cc0a9 | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1223 | struct pid *sid = task_pid(group_leader); |
| 1224 | pid_t session = pid_vnr(sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | int err = -EPERM; |
| 1226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | write_lock_irq(&tasklist_lock); |
Eric W. Biederman | 390e2ff | 2006-03-31 02:31:33 -0800 | [diff] [blame] | 1228 | /* Fail if I am already a session leader */ |
| 1229 | if (group_leader->signal->leader) |
| 1230 | goto out; |
| 1231 | |
Oleg Nesterov | 430c623 | 2008-02-08 04:19:11 -0800 | [diff] [blame] | 1232 | /* Fail if a process group id already exists that equals the |
| 1233 | * proposed session id. |
Eric W. Biederman | 390e2ff | 2006-03-31 02:31:33 -0800 | [diff] [blame] | 1234 | */ |
Oleg Nesterov | 6806aac | 2008-02-08 04:19:12 -0800 | [diff] [blame] | 1235 | if (pid_task(sid, PIDTYPE_PGID)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | goto out; |
| 1237 | |
Oren Laadan | e19f247 | 2006-01-08 01:03:58 -0800 | [diff] [blame] | 1238 | group_leader->signal->leader = 1; |
Oleg Nesterov | 8520d7c | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1239 | __set_special_pids(sid); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 1240 | |
Alan Cox | 9c9f4de | 2008-10-13 10:37:26 +0100 | [diff] [blame] | 1241 | proc_clear_tty(group_leader); |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 1242 | |
Oleg Nesterov | e4cc0a9 | 2008-02-08 04:19:09 -0800 | [diff] [blame] | 1243 | err = session; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | out: |
| 1245 | write_unlock_irq(&tasklist_lock); |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1246 | if (err > 0) { |
Christian Borntraeger | 0d0df59 | 2009-10-26 16:49:34 -0700 | [diff] [blame] | 1247 | proc_sid_connector(group_leader); |
Mike Galbraith | 5091faa | 2010-11-30 14:18:03 +0100 | [diff] [blame] | 1248 | sched_autogroup_create_attach(group_leader); |
| 1249 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | return err; |
| 1251 | } |
| 1252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | DECLARE_RWSEM(uts_sem); |
| 1254 | |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1255 | #ifdef COMPAT_UTS_MACHINE |
| 1256 | #define override_architecture(name) \ |
Andreas Schwab | 46da276 | 2010-04-23 13:17:44 -0400 | [diff] [blame] | 1257 | (personality(current->personality) == PER_LINUX32 && \ |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1258 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
| 1259 | sizeof(COMPAT_UTS_MACHINE))) |
| 1260 | #else |
| 1261 | #define override_architecture(name) 0 |
| 1262 | #endif |
| 1263 | |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1264 | /* |
| 1265 | * Work around broken programs that cannot handle "Linux 3.0". |
| 1266 | * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 |
| 1267 | */ |
| 1268 | static int override_release(char __user *release, int len) |
| 1269 | { |
| 1270 | int ret = 0; |
Linus Torvalds | a84a79e | 2011-10-17 08:24:24 -0700 | [diff] [blame] | 1271 | char buf[65]; |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1272 | |
| 1273 | if (current->personality & UNAME26) { |
| 1274 | char *rest = UTS_RELEASE; |
| 1275 | int ndots = 0; |
| 1276 | unsigned v; |
| 1277 | |
| 1278 | while (*rest) { |
| 1279 | if (*rest == '.' && ++ndots >= 3) |
| 1280 | break; |
| 1281 | if (!isdigit(*rest) && *rest != '.') |
| 1282 | break; |
| 1283 | rest++; |
| 1284 | } |
| 1285 | v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40; |
| 1286 | snprintf(buf, len, "2.6.%u%s", v, rest); |
| 1287 | ret = copy_to_user(release, buf, len); |
| 1288 | } |
| 1289 | return ret; |
| 1290 | } |
| 1291 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1292 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | { |
| 1294 | int errno = 0; |
| 1295 | |
| 1296 | down_read(&uts_sem); |
Serge E. Hallyn | e9ff399 | 2006-10-02 02:18:11 -0700 | [diff] [blame] | 1297 | if (copy_to_user(name, utsname(), sizeof *name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | errno = -EFAULT; |
| 1299 | up_read(&uts_sem); |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1300 | |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1301 | if (!errno && override_release(name->release, sizeof(name->release))) |
| 1302 | errno = -EFAULT; |
Christoph Hellwig | e28cbf2 | 2010-03-10 15:21:19 -0800 | [diff] [blame] | 1303 | if (!errno && override_architecture(name)) |
| 1304 | errno = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | return errno; |
| 1306 | } |
| 1307 | |
Christoph Hellwig | 5cacdb4 | 2010-03-10 15:21:21 -0800 | [diff] [blame] | 1308 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
| 1309 | /* |
| 1310 | * Old cruft |
| 1311 | */ |
| 1312 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) |
| 1313 | { |
| 1314 | int error = 0; |
| 1315 | |
| 1316 | if (!name) |
| 1317 | return -EFAULT; |
| 1318 | |
| 1319 | down_read(&uts_sem); |
| 1320 | if (copy_to_user(name, utsname(), sizeof(*name))) |
| 1321 | error = -EFAULT; |
| 1322 | up_read(&uts_sem); |
| 1323 | |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1324 | if (!error && override_release(name->release, sizeof(name->release))) |
| 1325 | error = -EFAULT; |
Christoph Hellwig | 5cacdb4 | 2010-03-10 15:21:21 -0800 | [diff] [blame] | 1326 | if (!error && override_architecture(name)) |
| 1327 | error = -EFAULT; |
| 1328 | return error; |
| 1329 | } |
| 1330 | |
| 1331 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) |
| 1332 | { |
| 1333 | int error; |
| 1334 | |
| 1335 | if (!name) |
| 1336 | return -EFAULT; |
| 1337 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) |
| 1338 | return -EFAULT; |
| 1339 | |
| 1340 | down_read(&uts_sem); |
| 1341 | error = __copy_to_user(&name->sysname, &utsname()->sysname, |
| 1342 | __OLD_UTS_LEN); |
| 1343 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); |
| 1344 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, |
| 1345 | __OLD_UTS_LEN); |
| 1346 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); |
| 1347 | error |= __copy_to_user(&name->release, &utsname()->release, |
| 1348 | __OLD_UTS_LEN); |
| 1349 | error |= __put_user(0, name->release + __OLD_UTS_LEN); |
| 1350 | error |= __copy_to_user(&name->version, &utsname()->version, |
| 1351 | __OLD_UTS_LEN); |
| 1352 | error |= __put_user(0, name->version + __OLD_UTS_LEN); |
| 1353 | error |= __copy_to_user(&name->machine, &utsname()->machine, |
| 1354 | __OLD_UTS_LEN); |
| 1355 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); |
| 1356 | up_read(&uts_sem); |
| 1357 | |
| 1358 | if (!error && override_architecture(name)) |
| 1359 | error = -EFAULT; |
Andi Kleen | be27425 | 2011-08-19 16:15:10 -0700 | [diff] [blame] | 1360 | if (!error && override_release(name->release, sizeof(name->release))) |
| 1361 | error = -EFAULT; |
Christoph Hellwig | 5cacdb4 | 2010-03-10 15:21:21 -0800 | [diff] [blame] | 1362 | return error ? -EFAULT : 0; |
| 1363 | } |
| 1364 | #endif |
| 1365 | |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1366 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | { |
| 1368 | int errno; |
| 1369 | char tmp[__NEW_UTS_LEN]; |
| 1370 | |
Serge E. Hallyn | bb96a6f | 2011-03-23 16:43:18 -0700 | [diff] [blame] | 1371 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | return -EPERM; |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | if (len < 0 || len > __NEW_UTS_LEN) |
| 1375 | return -EINVAL; |
| 1376 | down_write(&uts_sem); |
| 1377 | errno = -EFAULT; |
| 1378 | if (!copy_from_user(tmp, name, len)) { |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1379 | struct new_utsname *u = utsname(); |
| 1380 | |
| 1381 | memcpy(u->nodename, tmp, len); |
| 1382 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | errno = 0; |
Sasikantha babu | 499eea6 | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 1384 | uts_proc_notify(UTS_PROC_HOSTNAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | } |
| 1386 | up_write(&uts_sem); |
| 1387 | return errno; |
| 1388 | } |
| 1389 | |
| 1390 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME |
| 1391 | |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1392 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | { |
| 1394 | int i, errno; |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1395 | struct new_utsname *u; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | |
| 1397 | if (len < 0) |
| 1398 | return -EINVAL; |
| 1399 | down_read(&uts_sem); |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1400 | u = utsname(); |
| 1401 | i = 1 + strlen(u->nodename); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | if (i > len) |
| 1403 | i = len; |
| 1404 | errno = 0; |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1405 | if (copy_to_user(name, u->nodename, i)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | errno = -EFAULT; |
| 1407 | up_read(&uts_sem); |
| 1408 | return errno; |
| 1409 | } |
| 1410 | |
| 1411 | #endif |
| 1412 | |
| 1413 | /* |
| 1414 | * Only setdomainname; getdomainname can be implemented by calling |
| 1415 | * uname() |
| 1416 | */ |
Heiko Carstens | 5a8a82b | 2009-01-14 14:14:25 +0100 | [diff] [blame] | 1417 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | { |
| 1419 | int errno; |
| 1420 | char tmp[__NEW_UTS_LEN]; |
| 1421 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1422 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | return -EPERM; |
| 1424 | if (len < 0 || len > __NEW_UTS_LEN) |
| 1425 | return -EINVAL; |
| 1426 | |
| 1427 | down_write(&uts_sem); |
| 1428 | errno = -EFAULT; |
| 1429 | if (!copy_from_user(tmp, name, len)) { |
Andrew Morton | 9679e4d | 2008-10-15 22:01:51 -0700 | [diff] [blame] | 1430 | struct new_utsname *u = utsname(); |
| 1431 | |
| 1432 | memcpy(u->domainname, tmp, len); |
| 1433 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | errno = 0; |
Sasikantha babu | 499eea6 | 2012-05-31 16:26:07 -0700 | [diff] [blame] | 1435 | uts_proc_notify(UTS_PROC_DOMAINNAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | } |
| 1437 | up_write(&uts_sem); |
| 1438 | return errno; |
| 1439 | } |
| 1440 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1441 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | { |
Jiri Slaby | b951834 | 2010-05-04 11:28:25 +0200 | [diff] [blame] | 1443 | struct rlimit value; |
| 1444 | int ret; |
| 1445 | |
| 1446 | ret = do_prlimit(current, resource, NULL, &value); |
| 1447 | if (!ret) |
| 1448 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; |
| 1449 | |
| 1450 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | } |
| 1452 | |
| 1453 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT |
| 1454 | |
| 1455 | /* |
| 1456 | * Back compatibility for getrlimit. Needed for some apps. |
| 1457 | */ |
| 1458 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1459 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
| 1460 | struct rlimit __user *, rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | { |
| 1462 | struct rlimit x; |
| 1463 | if (resource >= RLIM_NLIMITS) |
| 1464 | return -EINVAL; |
| 1465 | |
| 1466 | task_lock(current->group_leader); |
| 1467 | x = current->signal->rlim[resource]; |
| 1468 | task_unlock(current->group_leader); |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1469 | if (x.rlim_cur > 0x7FFFFFFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | x.rlim_cur = 0x7FFFFFFF; |
Cal Peake | 756184b | 2006-09-30 23:27:24 -0700 | [diff] [blame] | 1471 | if (x.rlim_max > 0x7FFFFFFF) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | x.rlim_max = 0x7FFFFFFF; |
| 1473 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; |
| 1474 | } |
| 1475 | |
| 1476 | #endif |
| 1477 | |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1478 | static inline bool rlim64_is_infinity(__u64 rlim64) |
| 1479 | { |
| 1480 | #if BITS_PER_LONG < 64 |
| 1481 | return rlim64 >= ULONG_MAX; |
| 1482 | #else |
| 1483 | return rlim64 == RLIM64_INFINITY; |
| 1484 | #endif |
| 1485 | } |
| 1486 | |
| 1487 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) |
| 1488 | { |
| 1489 | if (rlim->rlim_cur == RLIM_INFINITY) |
| 1490 | rlim64->rlim_cur = RLIM64_INFINITY; |
| 1491 | else |
| 1492 | rlim64->rlim_cur = rlim->rlim_cur; |
| 1493 | if (rlim->rlim_max == RLIM_INFINITY) |
| 1494 | rlim64->rlim_max = RLIM64_INFINITY; |
| 1495 | else |
| 1496 | rlim64->rlim_max = rlim->rlim_max; |
| 1497 | } |
| 1498 | |
| 1499 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) |
| 1500 | { |
| 1501 | if (rlim64_is_infinity(rlim64->rlim_cur)) |
| 1502 | rlim->rlim_cur = RLIM_INFINITY; |
| 1503 | else |
| 1504 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; |
| 1505 | if (rlim64_is_infinity(rlim64->rlim_max)) |
| 1506 | rlim->rlim_max = RLIM_INFINITY; |
| 1507 | else |
| 1508 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; |
| 1509 | } |
| 1510 | |
Jiri Slaby | 1c1e618d | 2009-08-28 14:08:17 +0200 | [diff] [blame] | 1511 | /* make sure you are allowed to change @tsk limits before calling this */ |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1512 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
| 1513 | struct rlimit *new_rlim, struct rlimit *old_rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | { |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1515 | struct rlimit *rlim; |
Jiri Slaby | 86f162f | 2009-11-14 17:37:04 +0100 | [diff] [blame] | 1516 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
| 1518 | if (resource >= RLIM_NLIMITS) |
| 1519 | return -EINVAL; |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1520 | if (new_rlim) { |
| 1521 | if (new_rlim->rlim_cur > new_rlim->rlim_max) |
| 1522 | return -EINVAL; |
| 1523 | if (resource == RLIMIT_NOFILE && |
| 1524 | new_rlim->rlim_max > sysctl_nr_open) |
| 1525 | return -EPERM; |
| 1526 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | |
Jiri Slaby | 1c1e618d | 2009-08-28 14:08:17 +0200 | [diff] [blame] | 1528 | /* protect tsk->signal and tsk->sighand from disappearing */ |
| 1529 | read_lock(&tasklist_lock); |
| 1530 | if (!tsk->sighand) { |
| 1531 | retval = -ESRCH; |
| 1532 | goto out; |
| 1533 | } |
| 1534 | |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1535 | rlim = tsk->signal->rlim + resource; |
Jiri Slaby | 86f162f | 2009-11-14 17:37:04 +0100 | [diff] [blame] | 1536 | task_lock(tsk->group_leader); |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1537 | if (new_rlim) { |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1538 | /* Keep the capable check against init_user_ns until |
| 1539 | cgroups can contain all limits */ |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1540 | if (new_rlim->rlim_max > rlim->rlim_max && |
| 1541 | !capable(CAP_SYS_RESOURCE)) |
| 1542 | retval = -EPERM; |
| 1543 | if (!retval) |
| 1544 | retval = security_task_setrlimit(tsk->group_leader, |
| 1545 | resource, new_rlim); |
| 1546 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { |
| 1547 | /* |
| 1548 | * The caller is asking for an immediate RLIMIT_CPU |
| 1549 | * expiry. But we use the zero value to mean "it was |
| 1550 | * never set". So let's cheat and make it one second |
| 1551 | * instead |
| 1552 | */ |
| 1553 | new_rlim->rlim_cur = 1; |
| 1554 | } |
Tom Alsberg | 9926e4c | 2007-05-08 00:30:31 -0700 | [diff] [blame] | 1555 | } |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1556 | if (!retval) { |
| 1557 | if (old_rlim) |
| 1558 | *old_rlim = *rlim; |
| 1559 | if (new_rlim) |
| 1560 | *rlim = *new_rlim; |
| 1561 | } |
Jiri Slaby | 7855c35 | 2009-08-26 23:45:34 +0200 | [diff] [blame] | 1562 | task_unlock(tsk->group_leader); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
Andrew Morton | d3561f7 | 2006-03-24 03:18:36 -0800 | [diff] [blame] | 1564 | /* |
| 1565 | * RLIMIT_CPU handling. Note that the kernel fails to return an error |
| 1566 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a |
| 1567 | * very long-standing error, and fixing it now risks breakage of |
| 1568 | * applications, so we live with it |
| 1569 | */ |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1570 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
| 1571 | new_rlim->rlim_cur != RLIM_INFINITY) |
| 1572 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); |
Andrew Morton | ec9e16b | 2006-03-24 03:18:34 -0800 | [diff] [blame] | 1573 | out: |
Jiri Slaby | 1c1e618d | 2009-08-28 14:08:17 +0200 | [diff] [blame] | 1574 | read_unlock(&tasklist_lock); |
Oleg Nesterov | 2fb9d26 | 2009-09-03 19:21:45 +0200 | [diff] [blame] | 1575 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1576 | } |
| 1577 | |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1578 | /* rcu lock must be held */ |
| 1579 | static int check_prlimit_permission(struct task_struct *task) |
| 1580 | { |
| 1581 | const struct cred *cred = current_cred(), *tcred; |
| 1582 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1583 | if (current == task) |
| 1584 | return 0; |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1585 | |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1586 | tcred = __task_cred(task); |
Eric W. Biederman | 5af6620 | 2012-03-03 20:21:47 -0800 | [diff] [blame] | 1587 | if (uid_eq(cred->uid, tcred->euid) && |
| 1588 | uid_eq(cred->uid, tcred->suid) && |
| 1589 | uid_eq(cred->uid, tcred->uid) && |
| 1590 | gid_eq(cred->gid, tcred->egid) && |
| 1591 | gid_eq(cred->gid, tcred->sgid) && |
| 1592 | gid_eq(cred->gid, tcred->gid)) |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1593 | return 0; |
Eric W. Biederman | c4a4d60 | 2011-11-16 23:15:31 -0800 | [diff] [blame] | 1594 | if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) |
Serge E. Hallyn | fc832ad | 2011-03-23 16:43:22 -0700 | [diff] [blame] | 1595 | return 0; |
| 1596 | |
| 1597 | return -EPERM; |
Jiri Slaby | c022a0a | 2010-05-04 18:03:50 +0200 | [diff] [blame] | 1598 | } |
| 1599 | |
| 1600 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, |
| 1601 | const struct rlimit64 __user *, new_rlim, |
| 1602 | struct rlimit64 __user *, old_rlim) |
| 1603 | { |
| 1604 | struct rlimit64 old64, new64; |
| 1605 | struct rlimit old, new; |
| 1606 | struct task_struct *tsk; |
| 1607 | int ret; |
| 1608 | |
| 1609 | if (new_rlim) { |
| 1610 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) |
| 1611 | return -EFAULT; |
| 1612 | rlim64_to_rlim(&new64, &new); |
| 1613 | } |
| 1614 | |
| 1615 | rcu_read_lock(); |
| 1616 | tsk = pid ? find_task_by_vpid(pid) : current; |
| 1617 | if (!tsk) { |
| 1618 | rcu_read_unlock(); |
| 1619 | return -ESRCH; |
| 1620 | } |
| 1621 | ret = check_prlimit_permission(tsk); |
| 1622 | if (ret) { |
| 1623 | rcu_read_unlock(); |
| 1624 | return ret; |
| 1625 | } |
| 1626 | get_task_struct(tsk); |
| 1627 | rcu_read_unlock(); |
| 1628 | |
| 1629 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, |
| 1630 | old_rlim ? &old : NULL); |
| 1631 | |
| 1632 | if (!ret && old_rlim) { |
| 1633 | rlim_to_rlim64(&old, &old64); |
| 1634 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) |
| 1635 | ret = -EFAULT; |
| 1636 | } |
| 1637 | |
| 1638 | put_task_struct(tsk); |
| 1639 | return ret; |
| 1640 | } |
| 1641 | |
Jiri Slaby | 7855c35 | 2009-08-26 23:45:34 +0200 | [diff] [blame] | 1642 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
| 1643 | { |
| 1644 | struct rlimit new_rlim; |
| 1645 | |
| 1646 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) |
| 1647 | return -EFAULT; |
Jiri Slaby | 5b41535 | 2010-03-24 16:11:29 +0100 | [diff] [blame] | 1648 | return do_prlimit(current, resource, &new_rlim, NULL); |
Jiri Slaby | 7855c35 | 2009-08-26 23:45:34 +0200 | [diff] [blame] | 1649 | } |
| 1650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | /* |
| 1652 | * It would make sense to put struct rusage in the task_struct, |
| 1653 | * except that would make the task_struct be *really big*. After |
| 1654 | * task_struct gets moved into malloc'ed memory, it would |
| 1655 | * make sense to do this. It will make moving the rest of the information |
| 1656 | * a lot simpler! (Which we're not doing right now because we're not |
| 1657 | * measuring them yet). |
| 1658 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
| 1660 | * races with threads incrementing their own counters. But since word |
| 1661 | * reads are atomic, we either get new values or old values and we don't |
| 1662 | * care which for the sums. We always take the siglock to protect reading |
| 1663 | * the c* fields from p->signal from races with exit.c updating those |
| 1664 | * fields when reaping, so a sample either gets all the additions of a |
| 1665 | * given child after it's reaped, or none so this sample is before reaping. |
Ravikiran G Thirumalai | 2dd0ebc | 2006-03-23 03:00:13 -0800 | [diff] [blame] | 1666 | * |
Ravikiran G Thirumalai | de047c1b | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1667 | * Locking: |
| 1668 | * We need to take the siglock for CHILDEREN, SELF and BOTH |
| 1669 | * for the cases current multithreaded, non-current single threaded |
| 1670 | * non-current multithreaded. Thread traversal is now safe with |
| 1671 | * the siglock held. |
| 1672 | * Strictly speaking, we donot need to take the siglock if we are current and |
| 1673 | * single threaded, as no one else can take our signal_struct away, no one |
| 1674 | * else can reap the children to update signal->c* counters, and no one else |
| 1675 | * can race with the signal-> fields. If we do not take any lock, the |
| 1676 | * signal-> fields could be read out of order while another thread was just |
| 1677 | * exiting. So we should place a read memory barrier when we avoid the lock. |
| 1678 | * On the writer side, write memory barrier is implied in __exit_signal |
| 1679 | * as __exit_signal releases the siglock spinlock after updating the signal-> |
| 1680 | * fields. But we don't do this yet to keep things simple. |
Ravikiran G Thirumalai | 2dd0ebc | 2006-03-23 03:00:13 -0800 | [diff] [blame] | 1681 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | */ |
| 1683 | |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1684 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1685 | { |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1686 | r->ru_nvcsw += t->nvcsw; |
| 1687 | r->ru_nivcsw += t->nivcsw; |
| 1688 | r->ru_minflt += t->min_flt; |
| 1689 | r->ru_majflt += t->maj_flt; |
| 1690 | r->ru_inblock += task_io_get_inblock(t); |
| 1691 | r->ru_oublock += task_io_get_oublock(t); |
| 1692 | } |
| 1693 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
| 1695 | { |
| 1696 | struct task_struct *t; |
| 1697 | unsigned long flags; |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1698 | cputime_t tgutime, tgstime, utime, stime; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1699 | unsigned long maxrss = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | |
| 1701 | memset((char *) r, 0, sizeof *r); |
Martin Schwidefsky | 6486163 | 2011-12-15 14:56:09 +0100 | [diff] [blame] | 1702 | utime = stime = 0; |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1703 | |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1704 | if (who == RUSAGE_THREAD) { |
Hidetoshi Seto | d180c5b | 2009-11-26 14:48:30 +0900 | [diff] [blame] | 1705 | task_times(current, &utime, &stime); |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1706 | accumulate_thread_rusage(p, r); |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1707 | maxrss = p->signal->maxrss; |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1708 | goto out; |
| 1709 | } |
| 1710 | |
Oleg Nesterov | d6cf723 | 2008-04-30 00:52:38 -0700 | [diff] [blame] | 1711 | if (!lock_task_sighand(p, &flags)) |
Ravikiran G Thirumalai | de047c1b | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1712 | return; |
Ravikiran G Thirumalai | 2dd0ebc | 2006-03-23 03:00:13 -0800 | [diff] [blame] | 1713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | switch (who) { |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1715 | case RUSAGE_BOTH: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | case RUSAGE_CHILDREN: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | utime = p->signal->cutime; |
| 1718 | stime = p->signal->cstime; |
| 1719 | r->ru_nvcsw = p->signal->cnvcsw; |
| 1720 | r->ru_nivcsw = p->signal->cnivcsw; |
| 1721 | r->ru_minflt = p->signal->cmin_flt; |
| 1722 | r->ru_majflt = p->signal->cmaj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 1723 | r->ru_inblock = p->signal->cinblock; |
| 1724 | r->ru_oublock = p->signal->coublock; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1725 | maxrss = p->signal->cmaxrss; |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1726 | |
| 1727 | if (who == RUSAGE_CHILDREN) |
| 1728 | break; |
| 1729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | case RUSAGE_SELF: |
Hidetoshi Seto | 0cf55e1 | 2009-12-02 17:28:07 +0900 | [diff] [blame] | 1731 | thread_group_times(p, &tgutime, &tgstime); |
Martin Schwidefsky | 6486163 | 2011-12-15 14:56:09 +0100 | [diff] [blame] | 1732 | utime += tgutime; |
| 1733 | stime += tgstime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | r->ru_nvcsw += p->signal->nvcsw; |
| 1735 | r->ru_nivcsw += p->signal->nivcsw; |
| 1736 | r->ru_minflt += p->signal->min_flt; |
| 1737 | r->ru_majflt += p->signal->maj_flt; |
Eric Dumazet | 6eaeeab | 2007-05-10 22:22:37 -0700 | [diff] [blame] | 1738 | r->ru_inblock += p->signal->inblock; |
| 1739 | r->ru_oublock += p->signal->oublock; |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1740 | if (maxrss < p->signal->maxrss) |
| 1741 | maxrss = p->signal->maxrss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | t = p; |
| 1743 | do { |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 1744 | accumulate_thread_rusage(t, r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | t = next_thread(t); |
| 1746 | } while (t != p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | break; |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | default: |
| 1750 | BUG(); |
| 1751 | } |
Ravikiran G Thirumalai | de047c1b | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1752 | unlock_task_sighand(p, &flags); |
Ravikiran G Thirumalai | de047c1b | 2006-06-22 14:47:26 -0700 | [diff] [blame] | 1753 | |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1754 | out: |
Oleg Nesterov | 0f59cc4 | 2006-01-08 01:05:15 -0800 | [diff] [blame] | 1755 | cputime_to_timeval(utime, &r->ru_utime); |
| 1756 | cputime_to_timeval(stime, &r->ru_stime); |
Jiri Pirko | 1f10206 | 2009-09-22 16:44:10 -0700 | [diff] [blame] | 1757 | |
| 1758 | if (who != RUSAGE_CHILDREN) { |
| 1759 | struct mm_struct *mm = get_task_mm(p); |
| 1760 | if (mm) { |
| 1761 | setmax_mm_hiwater_rss(&maxrss, mm); |
| 1762 | mmput(mm); |
| 1763 | } |
| 1764 | } |
| 1765 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | } |
| 1767 | |
| 1768 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) |
| 1769 | { |
| 1770 | struct rusage r; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | k_getrusage(p, who, &r); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
| 1773 | } |
| 1774 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1775 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | { |
Sripathi Kodi | 679c9cd | 2008-04-29 00:58:42 -0700 | [diff] [blame] | 1777 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
| 1778 | who != RUSAGE_THREAD) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | return -EINVAL; |
| 1780 | return getrusage(current, who, ru); |
| 1781 | } |
| 1782 | |
Heiko Carstens | e48fbb6 | 2009-01-14 14:14:26 +0100 | [diff] [blame] | 1783 | SYSCALL_DEFINE1(umask, int, mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | { |
| 1785 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); |
| 1786 | return mask; |
| 1787 | } |
Serge E. Hallyn | 3b7391d | 2008-02-04 22:29:45 -0800 | [diff] [blame] | 1788 | |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1789 | #ifdef CONFIG_CHECKPOINT_RESTORE |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1790 | static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) |
| 1791 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1792 | struct fd exe; |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1793 | struct dentry *dentry; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1794 | int err; |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1795 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1796 | exe = fdget(fd); |
| 1797 | if (!exe.file) |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1798 | return -EBADF; |
| 1799 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1800 | dentry = exe.file->f_path.dentry; |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1801 | |
| 1802 | /* |
| 1803 | * Because the original mm->exe_file points to executable file, make |
| 1804 | * sure that this one is executable as well, to avoid breaking an |
| 1805 | * overall picture. |
| 1806 | */ |
| 1807 | err = -EACCES; |
| 1808 | if (!S_ISREG(dentry->d_inode->i_mode) || |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1809 | exe.file->f_path.mnt->mnt_flags & MNT_NOEXEC) |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1810 | goto exit; |
| 1811 | |
| 1812 | err = inode_permission(dentry->d_inode, MAY_EXEC); |
| 1813 | if (err) |
| 1814 | goto exit; |
| 1815 | |
Konstantin Khlebnikov | bafb282 | 2012-06-07 14:21:11 -0700 | [diff] [blame] | 1816 | down_write(&mm->mmap_sem); |
| 1817 | |
| 1818 | /* |
Konstantin Khlebnikov | 4229fb1d | 2012-07-11 14:02:11 -0700 | [diff] [blame] | 1819 | * Forbid mm->exe_file change if old file still mapped. |
Konstantin Khlebnikov | bafb282 | 2012-06-07 14:21:11 -0700 | [diff] [blame] | 1820 | */ |
| 1821 | err = -EBUSY; |
Konstantin Khlebnikov | 4229fb1d | 2012-07-11 14:02:11 -0700 | [diff] [blame] | 1822 | if (mm->exe_file) { |
| 1823 | struct vm_area_struct *vma; |
| 1824 | |
| 1825 | for (vma = mm->mmap; vma; vma = vma->vm_next) |
| 1826 | if (vma->vm_file && |
| 1827 | path_equal(&vma->vm_file->f_path, |
| 1828 | &mm->exe_file->f_path)) |
| 1829 | goto exit_unlock; |
Konstantin Khlebnikov | bafb282 | 2012-06-07 14:21:11 -0700 | [diff] [blame] | 1830 | } |
| 1831 | |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1832 | /* |
| 1833 | * The symlink can be changed only once, just to disallow arbitrary |
| 1834 | * transitions malicious software might bring in. This means one |
| 1835 | * could make a snapshot over all processes running and monitor |
| 1836 | * /proc/pid/exe changes to notice unusual activity if needed. |
| 1837 | */ |
Konstantin Khlebnikov | bafb282 | 2012-06-07 14:21:11 -0700 | [diff] [blame] | 1838 | err = -EPERM; |
| 1839 | if (test_and_set_bit(MMF_EXE_FILE_CHANGED, &mm->flags)) |
| 1840 | goto exit_unlock; |
| 1841 | |
Konstantin Khlebnikov | 4229fb1d | 2012-07-11 14:02:11 -0700 | [diff] [blame] | 1842 | err = 0; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1843 | set_mm_exe_file(mm, exe.file); /* this grabs a reference to exe.file */ |
Konstantin Khlebnikov | bafb282 | 2012-06-07 14:21:11 -0700 | [diff] [blame] | 1844 | exit_unlock: |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1845 | up_write(&mm->mmap_sem); |
| 1846 | |
| 1847 | exit: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 1848 | fdput(exe); |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1849 | return err; |
| 1850 | } |
| 1851 | |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1852 | static int prctl_set_mm(int opt, unsigned long addr, |
| 1853 | unsigned long arg4, unsigned long arg5) |
| 1854 | { |
| 1855 | unsigned long rlim = rlimit(RLIMIT_DATA); |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1856 | struct mm_struct *mm = current->mm; |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1857 | struct vm_area_struct *vma; |
| 1858 | int error; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1859 | |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1860 | if (arg5 || (arg4 && opt != PR_SET_MM_AUXV)) |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1861 | return -EINVAL; |
| 1862 | |
Cyrill Gorcunov | 79f0713 | 2012-03-15 15:17:10 -0700 | [diff] [blame] | 1863 | if (!capable(CAP_SYS_RESOURCE)) |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1864 | return -EPERM; |
| 1865 | |
Cyrill Gorcunov | b32dfe3 | 2012-05-31 16:26:46 -0700 | [diff] [blame] | 1866 | if (opt == PR_SET_MM_EXE_FILE) |
| 1867 | return prctl_set_mm_exe_file(mm, (unsigned int)addr); |
| 1868 | |
Cyrill Gorcunov | 1ad75b9 | 2012-06-07 14:21:11 -0700 | [diff] [blame] | 1869 | if (addr >= TASK_SIZE || addr < mmap_min_addr) |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1870 | return -EINVAL; |
| 1871 | |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1872 | error = -EINVAL; |
| 1873 | |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1874 | down_read(&mm->mmap_sem); |
| 1875 | vma = find_vma(mm, addr); |
| 1876 | |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1877 | switch (opt) { |
| 1878 | case PR_SET_MM_START_CODE: |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1879 | mm->start_code = addr; |
| 1880 | break; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1881 | case PR_SET_MM_END_CODE: |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1882 | mm->end_code = addr; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1883 | break; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1884 | case PR_SET_MM_START_DATA: |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1885 | mm->start_data = addr; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1886 | break; |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1887 | case PR_SET_MM_END_DATA: |
| 1888 | mm->end_data = addr; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1889 | break; |
| 1890 | |
| 1891 | case PR_SET_MM_START_BRK: |
| 1892 | if (addr <= mm->end_data) |
| 1893 | goto out; |
| 1894 | |
| 1895 | if (rlim < RLIM_INFINITY && |
| 1896 | (mm->brk - addr) + |
| 1897 | (mm->end_data - mm->start_data) > rlim) |
| 1898 | goto out; |
| 1899 | |
| 1900 | mm->start_brk = addr; |
| 1901 | break; |
| 1902 | |
| 1903 | case PR_SET_MM_BRK: |
| 1904 | if (addr <= mm->end_data) |
| 1905 | goto out; |
| 1906 | |
| 1907 | if (rlim < RLIM_INFINITY && |
| 1908 | (addr - mm->start_brk) + |
| 1909 | (mm->end_data - mm->start_data) > rlim) |
| 1910 | goto out; |
| 1911 | |
| 1912 | mm->brk = addr; |
| 1913 | break; |
| 1914 | |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1915 | /* |
| 1916 | * If command line arguments and environment |
| 1917 | * are placed somewhere else on stack, we can |
| 1918 | * set them up here, ARG_START/END to setup |
| 1919 | * command line argumets and ENV_START/END |
| 1920 | * for environment. |
| 1921 | */ |
| 1922 | case PR_SET_MM_START_STACK: |
| 1923 | case PR_SET_MM_ARG_START: |
| 1924 | case PR_SET_MM_ARG_END: |
| 1925 | case PR_SET_MM_ENV_START: |
| 1926 | case PR_SET_MM_ENV_END: |
| 1927 | if (!vma) { |
| 1928 | error = -EFAULT; |
| 1929 | goto out; |
| 1930 | } |
Cyrill Gorcunov | fe8c7f5 | 2012-05-31 16:26:45 -0700 | [diff] [blame] | 1931 | if (opt == PR_SET_MM_START_STACK) |
| 1932 | mm->start_stack = addr; |
| 1933 | else if (opt == PR_SET_MM_ARG_START) |
| 1934 | mm->arg_start = addr; |
| 1935 | else if (opt == PR_SET_MM_ARG_END) |
| 1936 | mm->arg_end = addr; |
| 1937 | else if (opt == PR_SET_MM_ENV_START) |
| 1938 | mm->env_start = addr; |
| 1939 | else if (opt == PR_SET_MM_ENV_END) |
| 1940 | mm->env_end = addr; |
| 1941 | break; |
| 1942 | |
| 1943 | /* |
| 1944 | * This doesn't move auxiliary vector itself |
| 1945 | * since it's pinned to mm_struct, but allow |
| 1946 | * to fill vector with new values. It's up |
| 1947 | * to a caller to provide sane values here |
| 1948 | * otherwise user space tools which use this |
| 1949 | * vector might be unhappy. |
| 1950 | */ |
| 1951 | case PR_SET_MM_AUXV: { |
| 1952 | unsigned long user_auxv[AT_VECTOR_SIZE]; |
| 1953 | |
| 1954 | if (arg4 > sizeof(user_auxv)) |
| 1955 | goto out; |
| 1956 | up_read(&mm->mmap_sem); |
| 1957 | |
| 1958 | if (copy_from_user(user_auxv, (const void __user *)addr, arg4)) |
| 1959 | return -EFAULT; |
| 1960 | |
| 1961 | /* Make sure the last entry is always AT_NULL */ |
| 1962 | user_auxv[AT_VECTOR_SIZE - 2] = 0; |
| 1963 | user_auxv[AT_VECTOR_SIZE - 1] = 0; |
| 1964 | |
| 1965 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); |
| 1966 | |
| 1967 | task_lock(current); |
| 1968 | memcpy(mm->saved_auxv, user_auxv, arg4); |
| 1969 | task_unlock(current); |
| 1970 | |
| 1971 | return 0; |
| 1972 | } |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1973 | default: |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1974 | goto out; |
| 1975 | } |
| 1976 | |
| 1977 | error = 0; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1978 | out: |
| 1979 | up_read(&mm->mmap_sem); |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1980 | return error; |
| 1981 | } |
Cyrill Gorcunov | 300f786 | 2012-06-07 14:21:12 -0700 | [diff] [blame] | 1982 | |
| 1983 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
| 1984 | { |
| 1985 | return put_user(me->clear_child_tid, tid_addr); |
| 1986 | } |
| 1987 | |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1988 | #else /* CONFIG_CHECKPOINT_RESTORE */ |
| 1989 | static int prctl_set_mm(int opt, unsigned long addr, |
| 1990 | unsigned long arg4, unsigned long arg5) |
| 1991 | { |
| 1992 | return -EINVAL; |
| 1993 | } |
Cyrill Gorcunov | 300f786 | 2012-06-07 14:21:12 -0700 | [diff] [blame] | 1994 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
| 1995 | { |
| 1996 | return -EINVAL; |
| 1997 | } |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 1998 | #endif |
| 1999 | |
Heiko Carstens | c4ea37c | 2009-01-14 14:14:28 +0100 | [diff] [blame] | 2000 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
| 2001 | unsigned long, arg4, unsigned long, arg5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | { |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2003 | struct task_struct *me = current; |
| 2004 | unsigned char comm[sizeof(me->comm)]; |
| 2005 | long error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2007 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
| 2008 | if (error != -ENOSYS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | return error; |
| 2010 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2011 | error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2012 | switch (option) { |
| 2013 | case PR_SET_PDEATHSIG: |
Jesper Juhl | 0730ded | 2005-09-06 15:17:37 -0700 | [diff] [blame] | 2014 | if (!valid_signal(arg2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2015 | error = -EINVAL; |
| 2016 | break; |
| 2017 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2018 | me->pdeath_signal = arg2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | break; |
| 2020 | case PR_GET_PDEATHSIG: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2021 | error = put_user(me->pdeath_signal, (int __user *)arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | break; |
| 2023 | case PR_GET_DUMPABLE: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2024 | error = get_dumpable(me->mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | break; |
| 2026 | case PR_SET_DUMPABLE: |
Marcel Holtmann | abf75a5 | 2006-07-12 13:12:00 +0200 | [diff] [blame] | 2027 | if (arg2 < 0 || arg2 > 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | error = -EINVAL; |
| 2029 | break; |
| 2030 | } |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2031 | set_dumpable(me->mm, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | break; |
| 2033 | |
| 2034 | case PR_SET_UNALIGN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2035 | error = SET_UNALIGN_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | break; |
| 2037 | case PR_GET_UNALIGN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2038 | error = GET_UNALIGN_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | break; |
| 2040 | case PR_SET_FPEMU: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2041 | error = SET_FPEMU_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | break; |
| 2043 | case PR_GET_FPEMU: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2044 | error = GET_FPEMU_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | break; |
| 2046 | case PR_SET_FPEXC: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2047 | error = SET_FPEXC_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | break; |
| 2049 | case PR_GET_FPEXC: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2050 | error = GET_FPEXC_CTL(me, arg2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | break; |
| 2052 | case PR_GET_TIMING: |
| 2053 | error = PR_TIMING_STATISTICAL; |
| 2054 | break; |
| 2055 | case PR_SET_TIMING: |
Shi Weihua | 7b26655 | 2008-05-23 13:04:59 -0700 | [diff] [blame] | 2056 | if (arg2 != PR_TIMING_STATISTICAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | error = -EINVAL; |
| 2058 | break; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2059 | case PR_SET_NAME: |
| 2060 | comm[sizeof(me->comm)-1] = 0; |
| 2061 | if (strncpy_from_user(comm, (char __user *)arg2, |
| 2062 | sizeof(me->comm) - 1) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | return -EFAULT; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2064 | set_task_comm(me, comm); |
Vladimir Zapolskiy | f786ecb | 2011-09-21 09:26:44 +0000 | [diff] [blame] | 2065 | proc_comm_connector(me); |
Sasikantha babu | f1fd75b | 2012-07-30 14:39:08 -0700 | [diff] [blame] | 2066 | break; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2067 | case PR_GET_NAME: |
| 2068 | get_task_comm(comm, me); |
| 2069 | if (copy_to_user((char __user *)arg2, comm, |
| 2070 | sizeof(comm))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | return -EFAULT; |
Sasikantha babu | f1fd75b | 2012-07-30 14:39:08 -0700 | [diff] [blame] | 2072 | break; |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 2073 | case PR_GET_ENDIAN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2074 | error = GET_ENDIAN(me, arg2); |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 2075 | break; |
| 2076 | case PR_SET_ENDIAN: |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 2077 | error = SET_ENDIAN(me, arg2); |
Anton Blanchard | 651d765 | 2006-06-07 16:10:19 +1000 | [diff] [blame] | 2078 | break; |
Andrea Arcangeli | 1d9d02f | 2007-07-15 23:41:32 -0700 | [diff] [blame] | 2079 | case PR_GET_SECCOMP: |
| 2080 | error = prctl_get_seccomp(); |
| 2081 | break; |
| 2082 | case PR_SET_SECCOMP: |
Will Drewry | e2cfabdf | 2012-04-12 16:47:57 -0500 | [diff] [blame] | 2083 | error = prctl_set_seccomp(arg2, (char __user *)arg3); |
Andrea Arcangeli | 1d9d02f | 2007-07-15 23:41:32 -0700 | [diff] [blame] | 2084 | break; |
Erik Bosman | 8fb402b | 2008-04-11 18:54:17 +0200 | [diff] [blame] | 2085 | case PR_GET_TSC: |
| 2086 | error = GET_TSC_CTL(arg2); |
| 2087 | break; |
| 2088 | case PR_SET_TSC: |
| 2089 | error = SET_TSC_CTL(arg2); |
| 2090 | break; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2091 | case PR_TASK_PERF_EVENTS_DISABLE: |
| 2092 | error = perf_event_task_disable(); |
Ingo Molnar | 1d1c7dd | 2008-12-11 14:59:31 +0100 | [diff] [blame] | 2093 | break; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2094 | case PR_TASK_PERF_EVENTS_ENABLE: |
| 2095 | error = perf_event_task_enable(); |
Ingo Molnar | 1d1c7dd | 2008-12-11 14:59:31 +0100 | [diff] [blame] | 2096 | break; |
Arjan van de Ven | 6976675 | 2008-09-01 15:52:40 -0700 | [diff] [blame] | 2097 | case PR_GET_TIMERSLACK: |
| 2098 | error = current->timer_slack_ns; |
| 2099 | break; |
| 2100 | case PR_SET_TIMERSLACK: |
| 2101 | if (arg2 <= 0) |
| 2102 | current->timer_slack_ns = |
| 2103 | current->default_timer_slack_ns; |
| 2104 | else |
| 2105 | current->timer_slack_ns = arg2; |
| 2106 | break; |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 2107 | case PR_MCE_KILL: |
| 2108 | if (arg4 | arg5) |
| 2109 | return -EINVAL; |
| 2110 | switch (arg2) { |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 2111 | case PR_MCE_KILL_CLEAR: |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 2112 | if (arg3 != 0) |
| 2113 | return -EINVAL; |
| 2114 | current->flags &= ~PF_MCE_PROCESS; |
| 2115 | break; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 2116 | case PR_MCE_KILL_SET: |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 2117 | current->flags |= PF_MCE_PROCESS; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 2118 | if (arg3 == PR_MCE_KILL_EARLY) |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 2119 | current->flags |= PF_MCE_EARLY; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 2120 | else if (arg3 == PR_MCE_KILL_LATE) |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 2121 | current->flags &= ~PF_MCE_EARLY; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 2122 | else if (arg3 == PR_MCE_KILL_DEFAULT) |
| 2123 | current->flags &= |
| 2124 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); |
| 2125 | else |
| 2126 | return -EINVAL; |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 2127 | break; |
| 2128 | default: |
| 2129 | return -EINVAL; |
| 2130 | } |
Andi Kleen | 4db96cf | 2009-09-16 11:50:14 +0200 | [diff] [blame] | 2131 | break; |
Andi Kleen | 1087e9b | 2009-10-04 02:20:11 +0200 | [diff] [blame] | 2132 | case PR_MCE_KILL_GET: |
| 2133 | if (arg2 | arg3 | arg4 | arg5) |
| 2134 | return -EINVAL; |
| 2135 | if (current->flags & PF_MCE_PROCESS) |
| 2136 | error = (current->flags & PF_MCE_EARLY) ? |
| 2137 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; |
| 2138 | else |
| 2139 | error = PR_MCE_KILL_DEFAULT; |
| 2140 | break; |
Cyrill Gorcunov | 028ee4b | 2012-01-12 17:20:55 -0800 | [diff] [blame] | 2141 | case PR_SET_MM: |
| 2142 | error = prctl_set_mm(arg2, arg3, arg4, arg5); |
| 2143 | break; |
Cyrill Gorcunov | 5702c5e | 2012-06-20 12:53:04 -0700 | [diff] [blame] | 2144 | case PR_GET_TID_ADDRESS: |
| 2145 | error = prctl_get_tid_address(me, (int __user **)arg2); |
| 2146 | break; |
Lennart Poettering | ebec18a | 2012-03-23 15:01:54 -0700 | [diff] [blame] | 2147 | case PR_SET_CHILD_SUBREAPER: |
| 2148 | me->signal->is_child_subreaper = !!arg2; |
Lennart Poettering | ebec18a | 2012-03-23 15:01:54 -0700 | [diff] [blame] | 2149 | break; |
| 2150 | case PR_GET_CHILD_SUBREAPER: |
| 2151 | error = put_user(me->signal->is_child_subreaper, |
| 2152 | (int __user *) arg2); |
| 2153 | break; |
Andy Lutomirski | 259e5e6 | 2012-04-12 16:47:50 -0500 | [diff] [blame] | 2154 | case PR_SET_NO_NEW_PRIVS: |
| 2155 | if (arg2 != 1 || arg3 || arg4 || arg5) |
| 2156 | return -EINVAL; |
| 2157 | |
| 2158 | current->no_new_privs = 1; |
| 2159 | break; |
| 2160 | case PR_GET_NO_NEW_PRIVS: |
| 2161 | if (arg2 || arg3 || arg4 || arg5) |
| 2162 | return -EINVAL; |
| 2163 | return current->no_new_privs ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2164 | default: |
| 2165 | error = -EINVAL; |
| 2166 | break; |
| 2167 | } |
| 2168 | return error; |
| 2169 | } |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 2170 | |
Heiko Carstens | 836f92a | 2009-01-14 14:14:33 +0100 | [diff] [blame] | 2171 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
| 2172 | struct getcpu_cache __user *, unused) |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 2173 | { |
| 2174 | int err = 0; |
| 2175 | int cpu = raw_smp_processor_id(); |
| 2176 | if (cpup) |
| 2177 | err |= put_user(cpu, cpup); |
| 2178 | if (nodep) |
| 2179 | err |= put_user(cpu_to_node(cpu), nodep); |
Andi Kleen | 3cfc348 | 2006-09-26 10:52:28 +0200 | [diff] [blame] | 2180 | return err ? -EFAULT : 0; |
| 2181 | } |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 2182 | |
| 2183 | char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; |
| 2184 | |
Neil Horman | a06a4dc | 2010-05-26 14:42:58 -0700 | [diff] [blame] | 2185 | static void argv_cleanup(struct subprocess_info *info) |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 2186 | { |
Neil Horman | a06a4dc | 2010-05-26 14:42:58 -0700 | [diff] [blame] | 2187 | argv_free(info->argv); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 2188 | } |
| 2189 | |
Andrew Morton | b57b44a | 2012-07-30 14:40:03 -0700 | [diff] [blame] | 2190 | static int __orderly_poweroff(void) |
| 2191 | { |
| 2192 | int argc; |
| 2193 | char **argv; |
| 2194 | static char *envp[] = { |
| 2195 | "HOME=/", |
| 2196 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", |
| 2197 | NULL |
| 2198 | }; |
| 2199 | int ret; |
| 2200 | |
| 2201 | argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc); |
| 2202 | if (argv == NULL) { |
| 2203 | printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n", |
| 2204 | __func__, poweroff_cmd); |
| 2205 | return -ENOMEM; |
| 2206 | } |
| 2207 | |
hongfeng | 6c0c0d4 | 2012-10-04 17:12:25 -0700 | [diff] [blame] | 2208 | ret = call_usermodehelper_fns(argv[0], argv, envp, UMH_WAIT_EXEC, |
Andrew Morton | b57b44a | 2012-07-30 14:40:03 -0700 | [diff] [blame] | 2209 | NULL, argv_cleanup, NULL); |
| 2210 | if (ret == -ENOMEM) |
| 2211 | argv_free(argv); |
| 2212 | |
| 2213 | return ret; |
| 2214 | } |
| 2215 | |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 2216 | /** |
| 2217 | * orderly_poweroff - Trigger an orderly system poweroff |
| 2218 | * @force: force poweroff if command execution fails |
| 2219 | * |
| 2220 | * This may be called from any context to trigger a system shutdown. |
| 2221 | * If the orderly shutdown fails, it will force an immediate shutdown. |
| 2222 | */ |
| 2223 | int orderly_poweroff(bool force) |
| 2224 | { |
Andrew Morton | b57b44a | 2012-07-30 14:40:03 -0700 | [diff] [blame] | 2225 | int ret = __orderly_poweroff(); |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 2226 | |
Andrew Morton | b57b44a | 2012-07-30 14:40:03 -0700 | [diff] [blame] | 2227 | if (ret && force) { |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 2228 | printk(KERN_WARNING "Failed to start orderly shutdown: " |
| 2229 | "forcing the issue\n"); |
| 2230 | |
Andrew Morton | b57b44a | 2012-07-30 14:40:03 -0700 | [diff] [blame] | 2231 | /* |
| 2232 | * I guess this should try to kick off some daemon to sync and |
| 2233 | * poweroff asap. Or not even bother syncing if we're doing an |
| 2234 | * emergency shutdown? |
| 2235 | */ |
Jeremy Fitzhardinge | 10a0a8d | 2007-07-17 18:37:02 -0700 | [diff] [blame] | 2236 | emergency_sync(); |
| 2237 | kernel_power_off(); |
| 2238 | } |
| 2239 | |
| 2240 | return ret; |
| 2241 | } |
| 2242 | EXPORT_SYMBOL_GPL(orderly_poweroff); |