Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /****************************************************************************/ |
| 3 | /* |
| 4 | * linux/fs/binfmt_flat.c |
| 5 | * |
| 6 | * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> |
| 7 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> |
| 8 | * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> |
| 9 | * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> |
| 10 | * based heavily on: |
| 11 | * |
| 12 | * linux/fs/binfmt_aout.c: |
| 13 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds |
| 14 | * linux/fs/binfmt_flat.c for 2.0 kernel |
| 15 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> |
| 16 | * JAN/99 -- coded full program relocation (gerg@snapgear.com) |
| 17 | */ |
| 18 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/kernel.h> |
| 22 | #include <linux/sched.h> |
Ingo Molnar | 68db0cf | 2017-02-08 18:51:37 +0100 | [diff] [blame] | 23 | #include <linux/sched/task_stack.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/mm.h> |
| 25 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/errno.h> |
| 27 | #include <linux/signal.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/ptrace.h> |
| 32 | #include <linux/user.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/binfmts.h> |
| 35 | #include <linux/personality.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/flat.h> |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 38 | #include <linux/uaccess.h> |
Nicolas Pitre | 472f95f | 2016-07-24 11:30:26 -0400 | [diff] [blame] | 39 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #include <asm/byteorder.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <asm/unaligned.h> |
| 43 | #include <asm/cacheflush.h> |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 44 | #include <asm/page.h> |
Christoph Hellwig | 06d2bfe | 2019-06-13 09:08:52 +0200 | [diff] [blame] | 45 | #include <asm/flat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Christoph Hellwig | 02da283 | 2019-06-13 09:08:49 +0200 | [diff] [blame] | 47 | #ifndef flat_get_relocate_addr |
| 48 | #define flat_get_relocate_addr(rel) (rel) |
| 49 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | /****************************************************************************/ |
| 52 | |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 53 | /* |
Mike Frysinger | 2e94de8 | 2010-06-04 14:14:53 -0700 | [diff] [blame] | 54 | * User data (data section and bss) needs to be aligned. |
| 55 | * We pick 0x20 here because it is the max value elf2flt has always |
| 56 | * used in producing FLAT files, and because it seems to be large |
| 57 | * enough to make all the gcc alignment related tests happy. |
| 58 | */ |
| 59 | #define FLAT_DATA_ALIGN (0x20) |
| 60 | |
| 61 | /* |
| 62 | * User data (stack) also needs to be aligned. |
| 63 | * Here we can be a bit looser than the data sections since this |
| 64 | * needs to only meet arch ABI requirements. |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 65 | */ |
Mike Frysinger | 2952095 | 2010-06-29 15:05:21 -0700 | [diff] [blame] | 66 | #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
| 69 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ |
| 70 | |
Christoph Hellwig | a445d98 | 2019-06-13 09:09:01 +0200 | [diff] [blame] | 71 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 72 | #define MAX_SHARED_LIBS (4) |
| 73 | #else |
| 74 | #define MAX_SHARED_LIBS (1) |
| 75 | #endif |
| 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | struct lib_info { |
| 78 | struct { |
| 79 | unsigned long start_code; /* Start of text segment */ |
| 80 | unsigned long start_data; /* Start of data segment */ |
| 81 | unsigned long start_brk; /* End of data segment */ |
| 82 | unsigned long text_len; /* Length of text segment */ |
| 83 | unsigned long entry; /* Start address for this module */ |
| 84 | unsigned long build_date; /* When this one was compiled */ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 85 | bool loaded; /* Has this library been loaded? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | } lib_list[MAX_SHARED_LIBS]; |
| 87 | }; |
| 88 | |
| 89 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 90 | static int load_flat_shared_library(int id, struct lib_info *p); |
| 91 | #endif |
| 92 | |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 93 | static int load_flat_binary(struct linux_binprm *); |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 94 | static int flat_core_dump(struct coredump_params *cprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | static struct linux_binfmt flat_format = { |
| 97 | .module = THIS_MODULE, |
| 98 | .load_binary = load_flat_binary, |
| 99 | .core_dump = flat_core_dump, |
| 100 | .min_coredump = PAGE_SIZE |
| 101 | }; |
| 102 | |
| 103 | /****************************************************************************/ |
| 104 | /* |
| 105 | * Routine writes a core dump image in the current directory. |
| 106 | * Currently only a stub-function. |
| 107 | */ |
| 108 | |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 109 | static int flat_core_dump(struct coredump_params *cprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 111 | pr_warn("Process %s:%d received signr %d and should have core dumped\n", |
| 112 | current->comm, current->pid, cprm->siginfo->si_signo); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 113 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /****************************************************************************/ |
| 117 | /* |
| 118 | * create_flat_tables() parses the env- and arg-strings in new user |
| 119 | * memory and creates the pointer tables from them, and puts their |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 120 | * addresses on the "stack", recording the new stack pointer value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | */ |
| 122 | |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 123 | static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 125 | char __user *p; |
| 126 | unsigned long __user *sp; |
| 127 | long i, len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 129 | p = (char __user *)arg_start; |
| 130 | sp = (unsigned long __user *)current->mm->start_stack; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 132 | sp -= bprm->envc + 1; |
| 133 | sp -= bprm->argc + 1; |
Christoph Hellwig | bdd15a2 | 2019-06-13 09:08:51 +0200 | [diff] [blame] | 134 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) |
| 135 | sp -= 2; /* argvp + envp */ |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 136 | sp -= 1; /* &argc */ |
| 137 | |
| 138 | current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; |
| 139 | sp = (unsigned long __user *)current->mm->start_stack; |
| 140 | |
Al Viro | 8861fd57 | 2020-02-19 09:32:55 -0500 | [diff] [blame] | 141 | if (put_user(bprm->argc, sp++)) |
| 142 | return -EFAULT; |
Christoph Hellwig | bdd15a2 | 2019-06-13 09:08:51 +0200 | [diff] [blame] | 143 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) { |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 144 | unsigned long argv, envp; |
| 145 | argv = (unsigned long)(sp + 2); |
| 146 | envp = (unsigned long)(sp + 2 + bprm->argc + 1); |
Al Viro | 8861fd57 | 2020-02-19 09:32:55 -0500 | [diff] [blame] | 147 | if (put_user(argv, sp++) || put_user(envp, sp++)) |
| 148 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 151 | current->mm->arg_start = (unsigned long)p; |
| 152 | for (i = bprm->argc; i > 0; i--) { |
Al Viro | 8861fd57 | 2020-02-19 09:32:55 -0500 | [diff] [blame] | 153 | if (put_user((unsigned long)p, sp++)) |
| 154 | return -EFAULT; |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 155 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 156 | if (!len || len > MAX_ARG_STRLEN) |
| 157 | return -EINVAL; |
| 158 | p += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
Al Viro | 8861fd57 | 2020-02-19 09:32:55 -0500 | [diff] [blame] | 160 | if (put_user(0, sp++)) |
| 161 | return -EFAULT; |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 162 | current->mm->arg_end = (unsigned long)p; |
| 163 | |
| 164 | current->mm->env_start = (unsigned long) p; |
| 165 | for (i = bprm->envc; i > 0; i--) { |
Al Viro | 8861fd57 | 2020-02-19 09:32:55 -0500 | [diff] [blame] | 166 | if (put_user((unsigned long)p, sp++)) |
| 167 | return -EFAULT; |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 168 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 169 | if (!len || len > MAX_ARG_STRLEN) |
| 170 | return -EINVAL; |
| 171 | p += len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | } |
Al Viro | 8861fd57 | 2020-02-19 09:32:55 -0500 | [diff] [blame] | 173 | if (put_user(0, sp++)) |
| 174 | return -EFAULT; |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 175 | current->mm->env_end = (unsigned long)p; |
| 176 | |
| 177 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | /****************************************************************************/ |
| 181 | |
| 182 | #ifdef CONFIG_BINFMT_ZFLAT |
| 183 | |
| 184 | #include <linux/zlib.h> |
| 185 | |
| 186 | #define LBUFSIZE 4000 |
| 187 | |
| 188 | /* gzip flag byte */ |
| 189 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ |
| 190 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ |
| 191 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ |
| 192 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ |
| 193 | #define COMMENT 0x10 /* bit 4 set: file comment present */ |
| 194 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ |
| 195 | #define RESERVED 0xC0 /* bit 6,7: reserved */ |
| 196 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 197 | static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst, |
| 198 | long len, int fd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
| 200 | unsigned char *buf; |
| 201 | z_stream strm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | int ret, retval; |
| 203 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 204 | pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
| 206 | memset(&strm, 0, sizeof(strm)); |
| 207 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
Markus Elfring | 9367bb7 | 2017-09-08 16:16:14 -0700 | [diff] [blame] | 208 | if (!strm.workspace) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | return -ENOMEM; |
Markus Elfring | 9367bb7 | 2017-09-08 16:16:14 -0700 | [diff] [blame] | 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
Markus Elfring | 9367bb7 | 2017-09-08 16:16:14 -0700 | [diff] [blame] | 212 | if (!buf) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | retval = -ENOMEM; |
| 214 | goto out_free; |
| 215 | } |
| 216 | |
| 217 | /* Read in first chunk of data and parse gzip header. */ |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 218 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | strm.next_in = buf; |
| 221 | strm.avail_in = ret; |
| 222 | strm.total_in = 0; |
| 223 | |
| 224 | retval = -ENOEXEC; |
| 225 | |
| 226 | /* Check minimum size -- gzip header */ |
| 227 | if (ret < 10) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 228 | pr_debug("file too small?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | goto out_free_buf; |
| 230 | } |
| 231 | |
| 232 | /* Check gzip magic number */ |
| 233 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 234 | pr_debug("unknown compression magic?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | goto out_free_buf; |
| 236 | } |
| 237 | |
| 238 | /* Check gzip method */ |
| 239 | if (buf[2] != 8) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 240 | pr_debug("unknown compression method?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | goto out_free_buf; |
| 242 | } |
| 243 | /* Check gzip flags */ |
| 244 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || |
| 245 | (buf[3] & RESERVED)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 246 | pr_debug("unknown flags?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | goto out_free_buf; |
| 248 | } |
| 249 | |
| 250 | ret = 10; |
| 251 | if (buf[3] & EXTRA_FIELD) { |
| 252 | ret += 2 + buf[10] + (buf[11] << 8); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 253 | if (unlikely(ret >= LBUFSIZE)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 254 | pr_debug("buffer overflow (EXTRA)?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | goto out_free_buf; |
| 256 | } |
| 257 | } |
| 258 | if (buf[3] & ORIG_NAME) { |
Volodymyr G. Lukiianyk | f4cfb18 | 2008-10-15 22:01:15 -0700 | [diff] [blame] | 259 | while (ret < LBUFSIZE && buf[ret++] != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | ; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 261 | if (unlikely(ret == LBUFSIZE)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 262 | pr_debug("buffer overflow (ORIG_NAME)?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | goto out_free_buf; |
| 264 | } |
| 265 | } |
| 266 | if (buf[3] & COMMENT) { |
Volodymyr G. Lukiianyk | f4cfb18 | 2008-10-15 22:01:15 -0700 | [diff] [blame] | 267 | while (ret < LBUFSIZE && buf[ret++] != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | ; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 269 | if (unlikely(ret == LBUFSIZE)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 270 | pr_debug("buffer overflow (COMMENT)?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | goto out_free_buf; |
| 272 | } |
| 273 | } |
| 274 | |
| 275 | strm.next_in += ret; |
| 276 | strm.avail_in -= ret; |
| 277 | |
| 278 | strm.next_out = dst; |
| 279 | strm.avail_out = len; |
| 280 | strm.total_out = 0; |
| 281 | |
| 282 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 283 | pr_debug("zlib init failed?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | goto out_free_buf; |
| 285 | } |
| 286 | |
| 287 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 288 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | if (ret <= 0) |
| 290 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | len -= ret; |
| 292 | |
| 293 | strm.next_in = buf; |
| 294 | strm.avail_in = ret; |
| 295 | strm.total_in = 0; |
| 296 | } |
| 297 | |
| 298 | if (ret < 0) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 299 | pr_debug("decompression failed (%d), %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | ret, strm.msg); |
| 301 | goto out_zlib; |
| 302 | } |
| 303 | |
| 304 | retval = 0; |
| 305 | out_zlib: |
| 306 | zlib_inflateEnd(&strm); |
| 307 | out_free_buf: |
| 308 | kfree(buf); |
| 309 | out_free: |
| 310 | kfree(strm.workspace); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | return retval; |
| 312 | } |
| 313 | |
| 314 | #endif /* CONFIG_BINFMT_ZFLAT */ |
| 315 | |
| 316 | /****************************************************************************/ |
| 317 | |
| 318 | static unsigned long |
| 319 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) |
| 320 | { |
| 321 | unsigned long addr; |
| 322 | int id; |
| 323 | unsigned long start_brk; |
| 324 | unsigned long start_data; |
| 325 | unsigned long text_len; |
| 326 | unsigned long start_code; |
| 327 | |
| 328 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 329 | if (r == 0) |
| 330 | id = curid; /* Relocs of 0 are always self referring */ |
| 331 | else { |
| 332 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ |
| 333 | r &= 0x00ffffff; /* Trim ID off here */ |
| 334 | } |
| 335 | if (id >= MAX_SHARED_LIBS) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 336 | pr_err("reference 0x%lx to shared library %d", r, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | goto failed; |
| 338 | } |
| 339 | if (curid != id) { |
| 340 | if (internalp) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 341 | pr_err("reloc address 0x%lx not in same module " |
| 342 | "(%d != %d)", r, curid, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | goto failed; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 344 | } else if (!p->lib_list[id].loaded && |
| 345 | load_flat_shared_library(id, p) < 0) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 346 | pr_err("failed to load library %d", id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | goto failed; |
| 348 | } |
| 349 | /* Check versioning information (i.e. time stamps) */ |
| 350 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && |
| 351 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 352 | pr_err("library %d is younger than %d", id, curid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | goto failed; |
| 354 | } |
| 355 | } |
| 356 | #else |
| 357 | id = 0; |
| 358 | #endif |
| 359 | |
| 360 | start_brk = p->lib_list[id].start_brk; |
| 361 | start_data = p->lib_list[id].start_data; |
| 362 | start_code = p->lib_list[id].start_code; |
| 363 | text_len = p->lib_list[id].text_len; |
| 364 | |
Christoph Hellwig | 9ee24b2 | 2019-06-13 09:08:47 +0200 | [diff] [blame] | 365 | if (r > start_brk - start_data + text_len) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 366 | pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 367 | r, start_brk-start_data+text_len, text_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | goto failed; |
| 369 | } |
| 370 | |
| 371 | if (r < text_len) /* In text segment */ |
| 372 | addr = r + start_code; |
| 373 | else /* In data segment */ |
| 374 | addr = r - text_len + start_data; |
| 375 | |
| 376 | /* Range checked already above so doing the range tests is redundant...*/ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 377 | return addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | |
| 379 | failed: |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 380 | pr_cont(", killing %s!\n", current->comm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | send_sig(SIGSEGV, current, 0); |
| 382 | |
| 383 | return RELOC_FAILED; |
| 384 | } |
| 385 | |
| 386 | /****************************************************************************/ |
| 387 | |
Christoph Hellwig | cf9a566 | 2019-06-13 09:08:58 +0200 | [diff] [blame] | 388 | #ifdef CONFIG_BINFMT_FLAT_OLD |
Axel Lin | 3430343 | 2014-06-04 16:12:15 -0700 | [diff] [blame] | 389 | static void old_reloc(unsigned long rl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 391 | static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | flat_v2_reloc_t r; |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 393 | unsigned long __user *ptr; |
| 394 | unsigned long val; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | r.value = rl; |
| 397 | #if defined(CONFIG_COLDFIRE) |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 398 | ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | #else |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 400 | ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | #endif |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 402 | get_user(val, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 404 | pr_debug("Relocation of variable at DATASEG+%x " |
| 405 | "(address %p, currently %lx) into segment %s\n", |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 406 | r.reloc.offset, ptr, val, segment[r.reloc.type]); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | switch (r.reloc.type) { |
| 409 | case OLD_FLAT_RELOC_TYPE_TEXT: |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 410 | val += current->mm->start_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | break; |
| 412 | case OLD_FLAT_RELOC_TYPE_DATA: |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 413 | val += current->mm->start_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | break; |
| 415 | case OLD_FLAT_RELOC_TYPE_BSS: |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 416 | val += current->mm->end_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | break; |
| 418 | default: |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 419 | pr_err("Unknown relocation type=%x\n", r.reloc.type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | break; |
| 421 | } |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 422 | put_user(val, ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 424 | pr_debug("Relocation became %lx\n", val); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 425 | } |
Christoph Hellwig | cf9a566 | 2019-06-13 09:08:58 +0200 | [diff] [blame] | 426 | #endif /* CONFIG_BINFMT_FLAT_OLD */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | /****************************************************************************/ |
| 429 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 430 | static int load_flat_file(struct linux_binprm *bprm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
| 432 | { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 433 | struct flat_hdr *hdr; |
| 434 | unsigned long textpos, datapos, realdatastart; |
Al Viro | 468138d | 2017-05-02 19:52:17 -0400 | [diff] [blame] | 435 | u32 text_len, data_len, bss_len, stack_len, full_data, flags; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 436 | unsigned long len, memp, memp_size, extra, rlim; |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 437 | __be32 __user *reloc; |
| 438 | u32 __user *rp; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 439 | int i, rev, relocs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | loff_t fpos; |
| 441 | unsigned long start_code, end_code; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 442 | ssize_t result; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 443 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
| 445 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | text_len = ntohl(hdr->data_start); |
| 448 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); |
| 449 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); |
| 450 | stack_len = ntohl(hdr->stack_size); |
| 451 | if (extra_stack) { |
| 452 | stack_len += *extra_stack; |
| 453 | *extra_stack = stack_len; |
| 454 | } |
| 455 | relocs = ntohl(hdr->reloc_count); |
| 456 | flags = ntohl(hdr->flags); |
| 457 | rev = ntohl(hdr->rev); |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 458 | full_data = data_len + relocs * sizeof(unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Greg Ungerer | 845884d | 2006-01-10 16:59:37 +1000 | [diff] [blame] | 460 | if (strncmp(hdr->magic, "bFLT", 4)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | /* |
Mike Frysinger | e2a366d | 2008-02-14 19:31:29 -0800 | [diff] [blame] | 462 | * Previously, here was a printk to tell people |
| 463 | * "BINFMT_FLAT: bad header magic". |
| 464 | * But for the kernel which also use ELF FD-PIC format, this |
| 465 | * error message is confusing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | * because a lot of people do not manage to produce good |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | */ |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 468 | ret = -ENOEXEC; |
| 469 | goto err; |
Greg Ungerer | 845884d | 2006-01-10 16:59:37 +1000 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | if (flags & FLAT_FLAG_KTRACE) |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 473 | pr_info("Loading file: %s\n", bprm->filename); |
Greg Ungerer | 845884d | 2006-01-10 16:59:37 +1000 | [diff] [blame] | 474 | |
Christoph Hellwig | cf9a566 | 2019-06-13 09:08:58 +0200 | [diff] [blame] | 475 | #ifdef CONFIG_BINFMT_FLAT_OLD |
Greg Ungerer | 845884d | 2006-01-10 16:59:37 +1000 | [diff] [blame] | 476 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 477 | pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n", |
| 478 | rev, FLAT_VERSION, OLD_FLAT_VERSION); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 479 | ret = -ENOEXEC; |
| 480 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 482 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | /* Don't allow old format executables to use shared libraries */ |
| 484 | if (rev == OLD_FLAT_VERSION && id != 0) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 485 | pr_err("shared libraries are not available before rev 0x%lx\n", |
| 486 | FLAT_VERSION); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 487 | ret = -ENOEXEC; |
| 488 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | } |
| 490 | |
| 491 | /* |
Christoph Hellwig | cf9a566 | 2019-06-13 09:08:58 +0200 | [diff] [blame] | 492 | * fix up the flags for the older format, there were all kinds |
| 493 | * of endian hacks, this only works for the simple cases |
| 494 | */ |
| 495 | if (rev == OLD_FLAT_VERSION && |
| 496 | (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM))) |
| 497 | flags = FLAT_FLAG_RAM; |
| 498 | |
| 499 | #else /* CONFIG_BINFMT_FLAT_OLD */ |
| 500 | if (rev != FLAT_VERSION) { |
| 501 | pr_err("bad flat file version 0x%x (supported 0x%lx)\n", |
| 502 | rev, FLAT_VERSION); |
| 503 | ret = -ENOEXEC; |
| 504 | goto err; |
| 505 | } |
| 506 | #endif /* !CONFIG_BINFMT_FLAT_OLD */ |
| 507 | |
| 508 | /* |
Nicolas Pitre | c995ee2 | 2016-07-24 11:30:17 -0400 | [diff] [blame] | 509 | * Make sure the header params are sane. |
| 510 | * 28 bits (256 MB) is way more than reasonable in this case. |
| 511 | * If some top bits are set we have probable binary corruption. |
| 512 | */ |
| 513 | if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) { |
| 514 | pr_err("bad header\n"); |
| 515 | ret = -ENOEXEC; |
| 516 | goto err; |
| 517 | } |
| 518 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | #ifndef CONFIG_BINFMT_ZFLAT |
| 520 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 521 | pr_err("Support for ZFLAT executables is not enabled.\n"); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 522 | ret = -ENOEXEC; |
| 523 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
| 525 | #endif |
| 526 | |
| 527 | /* |
| 528 | * Check initial limits. This avoids letting people circumvent |
| 529 | * size limits imposed on them by creating programs with large |
| 530 | * arrays in the data or bss. |
| 531 | */ |
Jiri Slaby | d554ed89 | 2010-03-05 13:42:42 -0800 | [diff] [blame] | 532 | rlim = rlimit(RLIMIT_DATA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | if (rlim >= RLIM_INFINITY) |
| 534 | rlim = ~0; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 535 | if (data_len + bss_len > rlim) { |
| 536 | ret = -ENOMEM; |
| 537 | goto err; |
| 538 | } |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | /* Flush all traces of the currently running executable */ |
| 541 | if (id == 0) { |
Eric W. Biederman | 2388777 | 2020-05-03 07:54:10 -0500 | [diff] [blame] | 542 | ret = begin_new_exec(bprm); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 543 | if (ret) |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 544 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | /* OK, This is the point of no return */ |
Malcolm Parsons | fcc18e8 | 2006-06-26 11:49:41 +1000 | [diff] [blame] | 547 | set_personality(PER_LINUX_32BIT); |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 548 | setup_new_exec(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | } |
| 550 | |
| 551 | /* |
| 552 | * calculate the extra space we need to map in |
| 553 | */ |
Andrew Morton | 0e647c0 | 2007-10-16 23:27:26 -0700 | [diff] [blame] | 554 | extra = max_t(unsigned long, bss_len + stack_len, |
| 555 | relocs * sizeof(unsigned long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
| 557 | /* |
| 558 | * there are a couple of cases here, the separate code/data |
| 559 | * case, and then the fully copied to RAM case which lumps |
| 560 | * it all together. |
| 561 | */ |
Nicolas Pitre | 015feac | 2016-07-24 11:30:25 -0400 | [diff] [blame] | 562 | if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | /* |
| 564 | * this should give us a ROM ptr, but if it doesn't we don't |
| 565 | * really care |
| 566 | */ |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 567 | pr_debug("ROM mapping of file (we hope)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 569 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 570 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 571 | if (!textpos || IS_ERR_VALUE(textpos)) { |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 572 | ret = textpos; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 573 | if (!textpos) |
| 574 | ret = -ENOMEM; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 575 | pr_err("Unable to mmap process text, errno %d\n", ret); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 576 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | } |
| 578 | |
Christoph Hellwig | a235722 | 2019-06-13 09:09:02 +0200 | [diff] [blame] | 579 | len = data_len + extra; |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 580 | len = PAGE_ALIGN(len); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 581 | realdatastart = vm_mmap(NULL, 0, len, |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 582 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 584 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 585 | ret = realdatastart; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 586 | if (!realdatastart) |
| 587 | ret = -ENOMEM; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 588 | pr_err("Unable to allocate RAM for process data, " |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 589 | "errno %d\n", ret); |
| 590 | vm_munmap(textpos, text_len); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 591 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
Christoph Hellwig | a235722 | 2019-06-13 09:09:02 +0200 | [diff] [blame] | 593 | datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
Geert Uytterhoeven | a860542 | 2017-07-16 13:57:27 +0200 | [diff] [blame] | 595 | pr_debug("Allocated data+bss+stack (%u bytes): %lx\n", |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 596 | data_len + bss_len + stack_len, datapos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
| 598 | fpos = ntohl(hdr->data_start); |
| 599 | #ifdef CONFIG_BINFMT_ZFLAT |
| 600 | if (flags & FLAT_FLAG_GZDATA) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 601 | result = decompress_exec(bprm, fpos, (char *)datapos, |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 602 | full_data, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } else |
| 604 | #endif |
| 605 | { |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 606 | result = read_code(bprm->file, datapos, fpos, |
| 607 | full_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 609 | if (IS_ERR_VALUE(result)) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 610 | ret = result; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 611 | pr_err("Unable to read data+bss, errno %d\n", ret); |
Al Viro | 7696e0c3 | 2012-05-30 01:56:23 -0400 | [diff] [blame] | 612 | vm_munmap(textpos, text_len); |
| 613 | vm_munmap(realdatastart, len); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 614 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |
| 616 | |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 617 | reloc = (__be32 __user *) |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 618 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | memp = realdatastart; |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 620 | memp_size = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | } else { |
| 622 | |
Christoph Hellwig | a235722 | 2019-06-13 09:09:02 +0200 | [diff] [blame] | 623 | len = text_len + data_len + extra; |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 624 | len = PAGE_ALIGN(len); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 625 | textpos = vm_mmap(NULL, 0, len, |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 626 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 627 | |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 628 | if (!textpos || IS_ERR_VALUE(textpos)) { |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 629 | ret = textpos; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 630 | if (!textpos) |
| 631 | ret = -ENOMEM; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 632 | pr_err("Unable to allocate RAM for process text/data, " |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 633 | "errno %d\n", ret); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 634 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | } |
| 636 | |
| 637 | realdatastart = textpos + ntohl(hdr->data_start); |
Christoph Hellwig | a235722 | 2019-06-13 09:09:02 +0200 | [diff] [blame] | 638 | datapos = ALIGN(realdatastart, FLAT_DATA_ALIGN); |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 639 | |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 640 | reloc = (__be32 __user *) |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 641 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | memp = textpos; |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 643 | memp_size = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | #ifdef CONFIG_BINFMT_ZFLAT |
| 645 | /* |
| 646 | * load it all in and treat it like a RAM load from now on |
| 647 | */ |
| 648 | if (flags & FLAT_FLAG_GZIP) { |
Nicolas Pitre | 472f95f | 2016-07-24 11:30:26 -0400 | [diff] [blame] | 649 | #ifndef CONFIG_MMU |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 650 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
| 651 | (((char *)textpos) + sizeof(struct flat_hdr)), |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 652 | (text_len + full_data |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 653 | - sizeof(struct flat_hdr)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | 0); |
Christoph Hellwig | a235722 | 2019-06-13 09:09:02 +0200 | [diff] [blame] | 655 | if (datapos != realdatastart) |
| 656 | memmove((void *)datapos, (void *)realdatastart, |
| 657 | full_data); |
Nicolas Pitre | 472f95f | 2016-07-24 11:30:26 -0400 | [diff] [blame] | 658 | #else |
| 659 | /* |
| 660 | * This is used on MMU systems mainly for testing. |
| 661 | * Let's use a kernel buffer to simplify things. |
| 662 | */ |
| 663 | long unz_text_len = text_len - sizeof(struct flat_hdr); |
| 664 | long unz_len = unz_text_len + full_data; |
| 665 | char *unz_data = vmalloc(unz_len); |
| 666 | if (!unz_data) { |
| 667 | result = -ENOMEM; |
| 668 | } else { |
| 669 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
| 670 | unz_data, unz_len, 0); |
| 671 | if (result == 0 && |
| 672 | (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr), |
| 673 | unz_data, unz_text_len) || |
| 674 | copy_to_user((void __user *)datapos, |
| 675 | unz_data + unz_text_len, full_data))) |
| 676 | result = -EFAULT; |
| 677 | vfree(unz_data); |
| 678 | } |
| 679 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } else if (flags & FLAT_FLAG_GZDATA) { |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 681 | result = read_code(bprm->file, textpos, 0, text_len); |
Nicolas Pitre | 472f95f | 2016-07-24 11:30:26 -0400 | [diff] [blame] | 682 | if (!IS_ERR_VALUE(result)) { |
| 683 | #ifndef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | result = decompress_exec(bprm, text_len, (char *) datapos, |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 685 | full_data, 0); |
Nicolas Pitre | 472f95f | 2016-07-24 11:30:26 -0400 | [diff] [blame] | 686 | #else |
| 687 | char *unz_data = vmalloc(full_data); |
| 688 | if (!unz_data) { |
| 689 | result = -ENOMEM; |
| 690 | } else { |
| 691 | result = decompress_exec(bprm, text_len, |
| 692 | unz_data, full_data, 0); |
| 693 | if (result == 0 && |
| 694 | copy_to_user((void __user *)datapos, |
| 695 | unz_data, full_data)) |
| 696 | result = -EFAULT; |
| 697 | vfree(unz_data); |
| 698 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | #endif |
Nicolas Pitre | 472f95f | 2016-07-24 11:30:26 -0400 | [diff] [blame] | 700 | } |
| 701 | } else |
| 702 | #endif /* CONFIG_BINFMT_ZFLAT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | { |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 704 | result = read_code(bprm->file, textpos, 0, text_len); |
| 705 | if (!IS_ERR_VALUE(result)) |
| 706 | result = read_code(bprm->file, datapos, |
| 707 | ntohl(hdr->data_start), |
| 708 | full_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 710 | if (IS_ERR_VALUE(result)) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 711 | ret = result; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 712 | pr_err("Unable to read code+data+bss, errno %d\n", ret); |
Christoph Hellwig | a235722 | 2019-06-13 09:09:02 +0200 | [diff] [blame] | 713 | vm_munmap(textpos, text_len + data_len + extra); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 714 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
| 716 | } |
| 717 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 718 | start_code = textpos + sizeof(struct flat_hdr); |
| 719 | end_code = textpos + text_len; |
| 720 | text_len -= sizeof(struct flat_hdr); /* the real code len */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
| 722 | /* The main program needs a little extra setup in the task structure */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | if (id == 0) { |
| 724 | current->mm->start_code = start_code; |
| 725 | current->mm->end_code = end_code; |
| 726 | current->mm->start_data = datapos; |
| 727 | current->mm->end_data = datapos + data_len; |
| 728 | /* |
| 729 | * set up the brk stuff, uses any slack left in data/bss/stack |
| 730 | * allocation. We put the brk after the bss (between the bss |
| 731 | * and stack) like other platforms. |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 732 | * Userspace code relies on the stack pointer starting out at |
| 733 | * an address right at the end of a page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | */ |
| 735 | current->mm->start_brk = datapos + data_len + bss_len; |
| 736 | current->mm->brk = (current->mm->start_brk + 3) & ~3; |
Nicolas Pitre | 015feac | 2016-07-24 11:30:25 -0400 | [diff] [blame] | 737 | #ifndef CONFIG_MMU |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 738 | current->mm->context.end_brk = memp + memp_size - stack_len; |
Nicolas Pitre | 015feac | 2016-07-24 11:30:25 -0400 | [diff] [blame] | 739 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
| 741 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 742 | if (flags & FLAT_FLAG_KTRACE) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 743 | pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", |
| 744 | textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); |
| 745 | pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", |
| 746 | id ? "Lib" : "Load", bprm->filename, |
| 747 | start_code, end_code, datapos, datapos + data_len, |
| 748 | datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 749 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
| 751 | /* Store the current module values into the global library structure */ |
| 752 | libinfo->lib_list[id].start_code = start_code; |
| 753 | libinfo->lib_list[id].start_data = datapos; |
| 754 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; |
| 755 | libinfo->lib_list[id].text_len = text_len; |
| 756 | libinfo->lib_list[id].loaded = 1; |
| 757 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
| 758 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | /* |
| 761 | * We just load the allocations into some temporary memory to |
| 762 | * help simplify all this mumbo jumbo |
| 763 | * |
| 764 | * We've got two different sections of relocation entries. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 765 | * The first is the GOT which resides at the beginning of the data segment |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | * and is terminated with a -1. This one can be relocated in place. |
| 767 | * The second is the extra relocation entries tacked after the image's |
| 768 | * data segment. These require a little more processing as the entry is |
| 769 | * really an offset into the image which contains an offset into the |
| 770 | * image. |
| 771 | */ |
| 772 | if (flags & FLAT_FLAG_GOTPIC) { |
Al Viro | 468138d | 2017-05-02 19:52:17 -0400 | [diff] [blame] | 773 | for (rp = (u32 __user *)datapos; ; rp++) { |
| 774 | u32 addr, rp_val; |
Nicolas Pitre | 6e572ff | 2016-07-24 11:30:21 -0400 | [diff] [blame] | 775 | if (get_user(rp_val, rp)) |
| 776 | return -EFAULT; |
| 777 | if (rp_val == 0xffffffff) |
| 778 | break; |
| 779 | if (rp_val) { |
| 780 | addr = calc_reloc(rp_val, libinfo, id, 0); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 781 | if (addr == RELOC_FAILED) { |
| 782 | ret = -ENOEXEC; |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 783 | goto err; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 784 | } |
Nicolas Pitre | 6e572ff | 2016-07-24 11:30:21 -0400 | [diff] [blame] | 785 | if (put_user(addr, rp)) |
| 786 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | /* |
| 792 | * Now run through the relocation entries. |
| 793 | * We've got to be careful here as C++ produces relocatable zero |
| 794 | * entries in the constructor and destructor tables which are then |
| 795 | * tested for being not zero (which will always occur unless we're |
| 796 | * based from address zero). This causes an endless loop as __start |
| 797 | * is at zero. The solution used is to not relocate zero addresses. |
| 798 | * This has the negative side effect of not allowing a global data |
| 799 | * reference to be statically initialised to _stext (I've moved |
| 800 | * __start to address 4 so that is okay). |
| 801 | */ |
| 802 | if (rev > OLD_FLAT_VERSION) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 803 | for (i = 0; i < relocs; i++) { |
Al Viro | 468138d | 2017-05-02 19:52:17 -0400 | [diff] [blame] | 804 | u32 addr, relval; |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 805 | __be32 tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 807 | /* |
| 808 | * Get the address of the pointer to be |
| 809 | * relocated (of course, the address has to be |
| 810 | * relocated first). |
| 811 | */ |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 812 | if (get_user(tmp, reloc + i)) |
Nicolas Pitre | 6e572ff | 2016-07-24 11:30:21 -0400 | [diff] [blame] | 813 | return -EFAULT; |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 814 | relval = ntohl(tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | addr = flat_get_relocate_addr(relval); |
Al Viro | 468138d | 2017-05-02 19:52:17 -0400 | [diff] [blame] | 816 | rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1); |
| 817 | if (rp == (u32 __user *)RELOC_FAILED) { |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 818 | ret = -ENOEXEC; |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 819 | goto err; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 820 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
| 822 | /* Get the pointer's value. */ |
Christoph Hellwig | 6843d8a | 2019-06-13 09:09:00 +0200 | [diff] [blame] | 823 | ret = flat_get_addr_from_rp(rp, relval, flags, &addr); |
Al Viro | 468138d | 2017-05-02 19:52:17 -0400 | [diff] [blame] | 824 | if (unlikely(ret)) |
| 825 | goto err; |
| 826 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | if (addr != 0) { |
| 828 | /* |
| 829 | * Do the relocation. PIC relocs in the data section are |
| 830 | * already in target order |
| 831 | */ |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 832 | if ((flags & FLAT_FLAG_GOTPIC) == 0) { |
| 833 | /* |
| 834 | * Meh, the same value can have a different |
| 835 | * byte order based on a flag.. |
| 836 | */ |
| 837 | addr = ntohl((__force __be32)addr); |
| 838 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | addr = calc_reloc(addr, libinfo, id, 0); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 840 | if (addr == RELOC_FAILED) { |
| 841 | ret = -ENOEXEC; |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 842 | goto err; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 843 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
| 845 | /* Write back the relocated pointer. */ |
Al Viro | 468138d | 2017-05-02 19:52:17 -0400 | [diff] [blame] | 846 | ret = flat_put_addr_at_rp(rp, addr, relval); |
| 847 | if (unlikely(ret)) |
| 848 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } |
| 850 | } |
Christoph Hellwig | cf9a566 | 2019-06-13 09:08:58 +0200 | [diff] [blame] | 851 | #ifdef CONFIG_BINFMT_FLAT_OLD |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } else { |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 853 | for (i = 0; i < relocs; i++) { |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 854 | __be32 relval; |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 855 | if (get_user(relval, reloc + i)) |
| 856 | return -EFAULT; |
Christoph Hellwig | 3b97771 | 2019-06-13 09:08:56 +0200 | [diff] [blame] | 857 | old_reloc(ntohl(relval)); |
Nicolas Pitre | 1b2ce44 | 2016-07-24 11:30:22 -0400 | [diff] [blame] | 858 | } |
Christoph Hellwig | cf9a566 | 2019-06-13 09:08:58 +0200 | [diff] [blame] | 859 | #endif /* CONFIG_BINFMT_FLAT_OLD */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | } |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 861 | |
Christoph Hellwig | 79ef1e1 | 2020-06-07 21:42:46 -0700 | [diff] [blame] | 862 | flush_icache_user_range(start_code, end_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | /* zero the BSS, BRK and stack areas */ |
Nicolas Pitre | 467aa14 | 2016-07-24 11:30:23 -0400 | [diff] [blame] | 865 | if (clear_user((void __user *)(datapos + data_len), bss_len + |
| 866 | (memp + memp_size - stack_len - /* end brk */ |
| 867 | libinfo->lib_list[id].start_brk) + /* start brk */ |
| 868 | stack_len)) |
| 869 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | |
| 871 | return 0; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 872 | err: |
| 873 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | } |
| 875 | |
| 876 | |
| 877 | /****************************************************************************/ |
| 878 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 879 | |
| 880 | /* |
| 881 | * Load a shared library into memory. The library gets its own data |
| 882 | * segment (including bss) but not argv/argc/environ. |
| 883 | */ |
| 884 | |
| 885 | static int load_flat_shared_library(int id, struct lib_info *libs) |
| 886 | { |
Jann Horn | 867bfa4 | 2019-06-28 12:06:46 -0700 | [diff] [blame] | 887 | /* |
| 888 | * This is a fake bprm struct; only the members "buf", "file" and |
| 889 | * "filename" are actually used. |
| 890 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | struct linux_binprm bprm; |
| 892 | int res; |
| 893 | char buf[16]; |
Jann Horn | 867bfa4 | 2019-06-28 12:06:46 -0700 | [diff] [blame] | 894 | loff_t pos = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
David Howells | 3a852d3 | 2011-04-28 16:26:38 +0100 | [diff] [blame] | 896 | memset(&bprm, 0, sizeof(bprm)); |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | /* Create the file name */ |
| 899 | sprintf(buf, "/lib/lib%d.so", id); |
| 900 | |
| 901 | /* Open the file up */ |
| 902 | bprm.filename = buf; |
| 903 | bprm.file = open_exec(bprm.filename); |
| 904 | res = PTR_ERR(bprm.file); |
| 905 | if (IS_ERR(bprm.file)) |
| 906 | return res; |
| 907 | |
Jann Horn | 867bfa4 | 2019-06-28 12:06:46 -0700 | [diff] [blame] | 908 | res = kernel_read(bprm.file, bprm.buf, BINPRM_BUF_SIZE, &pos); |
Linus Torvalds | 3440625 | 2009-08-06 15:09:34 -0700 | [diff] [blame] | 909 | |
Jann Horn | 867bfa4 | 2019-06-28 12:06:46 -0700 | [diff] [blame] | 910 | if (res >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | res = load_flat_file(&bprm, libs, id, NULL); |
Linus Torvalds | 3440625 | 2009-08-06 15:09:34 -0700 | [diff] [blame] | 912 | |
Linus Torvalds | 3440625 | 2009-08-06 15:09:34 -0700 | [diff] [blame] | 913 | allow_write_access(bprm.file); |
| 914 | fput(bprm.file); |
| 915 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 916 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ |
| 920 | /****************************************************************************/ |
| 921 | |
| 922 | /* |
| 923 | * These are the functions used to load flat style executables and shared |
| 924 | * libraries. There is no binary dependent code anywhere else. |
| 925 | */ |
| 926 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 927 | static int load_flat_binary(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
| 929 | struct lib_info libinfo; |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 930 | struct pt_regs *regs = current_pt_regs(); |
Nicolas Pitre | 015feac | 2016-07-24 11:30:25 -0400 | [diff] [blame] | 931 | unsigned long stack_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | unsigned long start_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | int res; |
| 934 | int i, j; |
| 935 | |
| 936 | memset(&libinfo, 0, sizeof(libinfo)); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | /* |
| 939 | * We have to add the size of our arguments to our stack size |
| 940 | * otherwise it's too easy for users to create stack overflows |
| 941 | * by passing in a huge argument list. And yes, we have to be |
| 942 | * pedantic and include space for the argv/envp array as it may have |
| 943 | * a lot of entries. |
| 944 | */ |
Nicolas Pitre | 015feac | 2016-07-24 11:30:25 -0400 | [diff] [blame] | 945 | #ifndef CONFIG_MMU |
| 946 | stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */ |
| 947 | #endif |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 948 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
| 949 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ |
| 950 | stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 951 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
Arnd Bergmann | 287980e | 2016-05-27 23:23:25 +0200 | [diff] [blame] | 953 | if (res < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | return res; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 955 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | /* Update data segment pointers for all libraries */ |
Nicolas Pitre | af521f9 | 2016-07-24 11:30:24 -0400 | [diff] [blame] | 957 | for (i = 0; i < MAX_SHARED_LIBS; i++) { |
| 958 | if (!libinfo.lib_list[i].loaded) |
| 959 | continue; |
| 960 | for (j = 0; j < MAX_SHARED_LIBS; j++) { |
| 961 | unsigned long val = libinfo.lib_list[j].loaded ? |
| 962 | libinfo.lib_list[j].start_data : UNLOADED_LIB; |
| 963 | unsigned long __user *p = (unsigned long __user *) |
| 964 | libinfo.lib_list[i].start_data; |
| 965 | p -= j + 1; |
| 966 | if (put_user(val, p)) |
| 967 | return -EFAULT; |
| 968 | } |
| 969 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | set_binfmt(&flat_format); |
| 972 | |
Nicolas Pitre | 015feac | 2016-07-24 11:30:25 -0400 | [diff] [blame] | 973 | #ifdef CONFIG_MMU |
| 974 | res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); |
| 975 | if (!res) |
| 976 | res = create_flat_tables(bprm, bprm->p); |
| 977 | #else |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 978 | /* Stash our initial stack pointer into the mm structure */ |
| 979 | current->mm->start_stack = |
| 980 | ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; |
| 981 | pr_debug("sp=%lx\n", current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | |
Nicolas Pitre | 687fd77 | 2016-07-24 11:30:19 -0400 | [diff] [blame] | 983 | /* copy the arg pages onto the stack */ |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 984 | res = transfer_args_to_stack(bprm, ¤t->mm->start_stack); |
| 985 | if (!res) |
| 986 | res = create_flat_tables(bprm, current->mm->start_stack); |
Nicolas Pitre | 015feac | 2016-07-24 11:30:25 -0400 | [diff] [blame] | 987 | #endif |
Nicolas Pitre | 687fd77 | 2016-07-24 11:30:19 -0400 | [diff] [blame] | 988 | if (res) |
| 989 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | /* Fake some return addresses to ensure the call chain will |
| 992 | * initialise library in order for us. We are required to call |
| 993 | * lib 1 first, then 2, ... and finally the main program (id 0). |
| 994 | */ |
| 995 | start_addr = libinfo.lib_list[0].entry; |
| 996 | |
| 997 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 998 | for (i = MAX_SHARED_LIBS-1; i > 0; i--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | if (libinfo.lib_list[i].loaded) { |
| 1000 | /* Push previos first to call address */ |
Nicolas Pitre | a97d157 | 2016-07-24 11:30:20 -0400 | [diff] [blame] | 1001 | unsigned long __user *sp; |
| 1002 | current->mm->start_stack -= sizeof(unsigned long); |
| 1003 | sp = (unsigned long __user *)current->mm->start_stack; |
Al Viro | 8861fd57 | 2020-02-19 09:32:55 -0500 | [diff] [blame] | 1004 | if (put_user(start_addr, sp)) |
| 1005 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | start_addr = libinfo.lib_list[i].entry; |
| 1007 | } |
| 1008 | } |
| 1009 | #endif |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 1010 | |
Takashi YOSHII | 74c27c4 | 2008-08-11 20:10:54 +0900 | [diff] [blame] | 1011 | #ifdef FLAT_PLAT_INIT |
| 1012 | FLAT_PLAT_INIT(regs); |
| 1013 | #endif |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 1014 | |
Kees Cook | b838383 | 2018-04-10 16:34:57 -0700 | [diff] [blame] | 1015 | finalize_exec(bprm); |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame] | 1016 | pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", |
| 1017 | regs, start_addr, current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | start_thread(regs, start_addr, current->mm->start_stack); |
| 1019 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | return 0; |
| 1021 | } |
| 1022 | |
| 1023 | /****************************************************************************/ |
| 1024 | |
| 1025 | static int __init init_flat_binfmt(void) |
| 1026 | { |
Al Viro | 8fc3dc5 | 2012-03-17 03:05:16 -0400 | [diff] [blame] | 1027 | register_binfmt(&flat_format); |
| 1028 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | core_initcall(init_flat_binfmt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | |
| 1032 | /****************************************************************************/ |