| /* |
| * sysctl.c: General linux system control interface |
| * |
| * Begun 24 March 1995, Stephen Tweedie |
| * Added /proc support, Dec 1995 |
| * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. |
| * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. |
| * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. |
| * Dynamic registration fixes, Stephen Tweedie. |
| * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. |
| * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris |
| * Horn. |
| * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. |
| * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. |
| * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill |
| * Wendling. |
| * The list_for_each() macro wasn't appropriate for the sysctl loop. |
| * Removed it and replaced it with older style, 03/23/00, Bill Wendling |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/aio.h> |
| #include <linux/mm.h> |
| #include <linux/swap.h> |
| #include <linux/slab.h> |
| #include <linux/sysctl.h> |
| #include <linux/bitmap.h> |
| #include <linux/signal.h> |
| #include <linux/printk.h> |
| #include <linux/proc_fs.h> |
| #include <linux/security.h> |
| #include <linux/ctype.h> |
| #include <linux/kmemleak.h> |
| #include <linux/fs.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/kobject.h> |
| #include <linux/net.h> |
| #include <linux/sysrq.h> |
| #include <linux/highuid.h> |
| #include <linux/writeback.h> |
| #include <linux/ratelimit.h> |
| #include <linux/compaction.h> |
| #include <linux/hugetlb.h> |
| #include <linux/initrd.h> |
| #include <linux/key.h> |
| #include <linux/times.h> |
| #include <linux/limits.h> |
| #include <linux/dcache.h> |
| #include <linux/dnotify.h> |
| #include <linux/syscalls.h> |
| #include <linux/vmstat.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/acpi.h> |
| #include <linux/reboot.h> |
| #include <linux/ftrace.h> |
| #include <linux/perf_event.h> |
| #include <linux/kprobes.h> |
| #include <linux/pipe_fs_i.h> |
| #include <linux/oom.h> |
| #include <linux/kmod.h> |
| #include <linux/capability.h> |
| #include <linux/binfmts.h> |
| #include <linux/sched/sysctl.h> |
| #include <linux/sched/coredump.h> |
| #include <linux/kexec.h> |
| #include <linux/bpf.h> |
| #include <linux/mount.h> |
| #include <linux/pipe_fs_i.h> |
| |
| #include <linux/uaccess.h> |
| #include <asm/processor.h> |
| |
| #ifdef CONFIG_X86 |
| #include <asm/nmi.h> |
| #include <asm/stacktrace.h> |
| #include <asm/io.h> |
| #endif |
| #ifdef CONFIG_SPARC |
| #include <asm/setup.h> |
| #endif |
| #ifdef CONFIG_BSD_PROCESS_ACCT |
| #include <linux/acct.h> |
| #endif |
| #ifdef CONFIG_RT_MUTEXES |
| #include <linux/rtmutex.h> |
| #endif |
| #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
| #include <linux/lockdep.h> |
| #endif |
| #ifdef CONFIG_CHR_DEV_SG |
| #include <scsi/sg.h> |
| #endif |
| |
| #ifdef CONFIG_LOCKUP_DETECTOR |
| #include <linux/nmi.h> |
| #endif |
| |
| #if defined(CONFIG_SYSCTL) |
| |
| /* External variables not in a header file. */ |
| extern int suid_dumpable; |
| #ifdef CONFIG_COREDUMP |
| extern int core_uses_pid; |
| extern char core_pattern[]; |
| extern unsigned int core_pipe_limit; |
| #endif |
| extern int pid_max; |
| extern int pid_max_min, pid_max_max; |
| extern int percpu_pagelist_fraction; |
| extern int latencytop_enabled; |
| extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; |
| #ifndef CONFIG_MMU |
| extern int sysctl_nr_trim_pages; |
| #endif |
| |
| /* Constants used for minimum and maximum */ |
| #ifdef CONFIG_LOCKUP_DETECTOR |
| static int sixty = 60; |
| #endif |
| |
| static int __maybe_unused neg_one = -1; |
| |
| static int zero; |
| static int __maybe_unused one = 1; |
| static int __maybe_unused two = 2; |
| static int __maybe_unused four = 4; |
| static unsigned long one_ul = 1; |
| static int one_hundred = 100; |
| static int one_thousand = 1000; |
| #ifdef CONFIG_PRINTK |
| static int ten_thousand = 10000; |
| #endif |
| #ifdef CONFIG_PERF_EVENTS |
| static int six_hundred_forty_kb = 640 * 1024; |
| #endif |
| |
| /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
| static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; |
| |
| /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
| static int maxolduid = 65535; |
| static int minolduid; |
| |
| static int ngroups_max = NGROUPS_MAX; |
| static const int cap_last_cap = CAP_LAST_CAP; |
| |
| /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ |
| #ifdef CONFIG_DETECT_HUNG_TASK |
| static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); |
| #endif |
| |
| #ifdef CONFIG_INOTIFY_USER |
| #include <linux/inotify.h> |
| #endif |
| #ifdef CONFIG_SPARC |
| #endif |
| |
| #ifdef __hppa__ |
| extern int pwrsw_enabled; |
| #endif |
| |
| #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW |
| extern int unaligned_enabled; |
| #endif |
| |
| #ifdef CONFIG_IA64 |
| extern int unaligned_dump_stack; |
| #endif |
| |
| #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN |
| extern int no_unaligned_warning; |
| #endif |
| |
| #ifdef CONFIG_PROC_SYSCTL |
| |
| /** |
| * enum sysctl_writes_mode - supported sysctl write modes |
| * |
| * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value |
| * to be written, and multiple writes on the same sysctl file descriptor |
| * will rewrite the sysctl value, regardless of file position. No warning |
| * is issued when the initial position is not 0. |
| * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is |
| * not 0. |
| * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at |
| * file position 0 and the value must be fully contained in the buffer |
| * sent to the write syscall. If dealing with strings respect the file |
| * position, but restrict this to the max length of the buffer, anything |
| * passed the max lenght will be ignored. Multiple writes will append |
| * to the buffer. |
| * |
| * These write modes control how current file position affects the behavior of |
| * updating sysctl values through the proc interface on each write. |
| */ |
| enum sysctl_writes_mode { |
| SYSCTL_WRITES_LEGACY = -1, |
| SYSCTL_WRITES_WARN = 0, |
| SYSCTL_WRITES_STRICT = 1, |
| }; |
| |
| static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; |
| |
| static int proc_do_cad_pid(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| static int proc_taint(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| #endif |
| |
| #ifdef CONFIG_PRINTK |
| static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| #endif |
| |
| static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| #ifdef CONFIG_COREDUMP |
| static int proc_dostring_coredump(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| #endif |
| |
| #ifdef CONFIG_MAGIC_SYSRQ |
| /* Note: sysrq code uses it's own private copy */ |
| static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; |
| |
| static int sysrq_sysctl_handler(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, |
| loff_t *ppos) |
| { |
| int error; |
| |
| error = proc_dointvec(table, write, buffer, lenp, ppos); |
| if (error) |
| return error; |
| |
| if (write) |
| sysrq_toggle_support(__sysrq_enabled); |
| |
| return 0; |
| } |
| |
| #endif |
| |
| static struct ctl_table kern_table[]; |
| static struct ctl_table vm_table[]; |
| static struct ctl_table fs_table[]; |
| static struct ctl_table debug_table[]; |
| static struct ctl_table dev_table[]; |
| extern struct ctl_table random_table[]; |
| #ifdef CONFIG_EPOLL |
| extern struct ctl_table epoll_table[]; |
| #endif |
| |
| #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| int sysctl_legacy_va_layout; |
| #endif |
| |
| /* The default sysctl tables: */ |
| |
| static struct ctl_table sysctl_base_table[] = { |
| { |
| .procname = "kernel", |
| .mode = 0555, |
| .child = kern_table, |
| }, |
| { |
| .procname = "vm", |
| .mode = 0555, |
| .child = vm_table, |
| }, |
| { |
| .procname = "fs", |
| .mode = 0555, |
| .child = fs_table, |
| }, |
| { |
| .procname = "debug", |
| .mode = 0555, |
| .child = debug_table, |
| }, |
| { |
| .procname = "dev", |
| .mode = 0555, |
| .child = dev_table, |
| }, |
| { } |
| }; |
| |
| #ifdef CONFIG_SCHED_DEBUG |
| static int min_sched_granularity_ns = 100000; /* 100 usecs */ |
| static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
| static int min_wakeup_granularity_ns; /* 0 usecs */ |
| static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ |
| #ifdef CONFIG_SMP |
| static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; |
| static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; |
| #endif /* CONFIG_SMP */ |
| #endif /* CONFIG_SCHED_DEBUG */ |
| |
| #ifdef CONFIG_COMPACTION |
| static int min_extfrag_threshold; |
| static int max_extfrag_threshold = 1000; |
| #endif |
| |
| static struct ctl_table kern_table[] = { |
| { |
| .procname = "sched_child_runs_first", |
| .data = &sysctl_sched_child_runs_first, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #ifdef CONFIG_SCHED_DEBUG |
| { |
| .procname = "sched_min_granularity_ns", |
| .data = &sysctl_sched_min_granularity, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = sched_proc_update_handler, |
| .extra1 = &min_sched_granularity_ns, |
| .extra2 = &max_sched_granularity_ns, |
| }, |
| { |
| .procname = "sched_latency_ns", |
| .data = &sysctl_sched_latency, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = sched_proc_update_handler, |
| .extra1 = &min_sched_granularity_ns, |
| .extra2 = &max_sched_granularity_ns, |
| }, |
| { |
| .procname = "sched_wakeup_granularity_ns", |
| .data = &sysctl_sched_wakeup_granularity, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = sched_proc_update_handler, |
| .extra1 = &min_wakeup_granularity_ns, |
| .extra2 = &max_wakeup_granularity_ns, |
| }, |
| #ifdef CONFIG_SMP |
| { |
| .procname = "sched_tunable_scaling", |
| .data = &sysctl_sched_tunable_scaling, |
| .maxlen = sizeof(enum sched_tunable_scaling), |
| .mode = 0644, |
| .proc_handler = sched_proc_update_handler, |
| .extra1 = &min_sched_tunable_scaling, |
| .extra2 = &max_sched_tunable_scaling, |
| }, |
| { |
| .procname = "sched_migration_cost_ns", |
| .data = &sysctl_sched_migration_cost, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "sched_nr_migrate", |
| .data = &sysctl_sched_nr_migrate, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "sched_time_avg_ms", |
| .data = &sysctl_sched_time_avg, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &one, |
| }, |
| #ifdef CONFIG_SCHEDSTATS |
| { |
| .procname = "sched_schedstats", |
| .data = NULL, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = sysctl_schedstats, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif /* CONFIG_SCHEDSTATS */ |
| #endif /* CONFIG_SMP */ |
| #ifdef CONFIG_NUMA_BALANCING |
| { |
| .procname = "numa_balancing_scan_delay_ms", |
| .data = &sysctl_numa_balancing_scan_delay, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "numa_balancing_scan_period_min_ms", |
| .data = &sysctl_numa_balancing_scan_period_min, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "numa_balancing_scan_period_max_ms", |
| .data = &sysctl_numa_balancing_scan_period_max, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "numa_balancing_scan_size_mb", |
| .data = &sysctl_numa_balancing_scan_size, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &one, |
| }, |
| { |
| .procname = "numa_balancing", |
| .data = NULL, /* filled in by handler */ |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = sysctl_numa_balancing, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif /* CONFIG_NUMA_BALANCING */ |
| #endif /* CONFIG_SCHED_DEBUG */ |
| { |
| .procname = "sched_rt_period_us", |
| .data = &sysctl_sched_rt_period, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = sched_rt_handler, |
| }, |
| { |
| .procname = "sched_rt_runtime_us", |
| .data = &sysctl_sched_rt_runtime, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sched_rt_handler, |
| }, |
| { |
| .procname = "sched_rr_timeslice_ms", |
| .data = &sysctl_sched_rr_timeslice, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sched_rr_handler, |
| }, |
| #ifdef CONFIG_SCHED_AUTOGROUP |
| { |
| .procname = "sched_autogroup_enabled", |
| .data = &sysctl_sched_autogroup_enabled, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| #ifdef CONFIG_CFS_BANDWIDTH |
| { |
| .procname = "sched_cfs_bandwidth_slice_us", |
| .data = &sysctl_sched_cfs_bandwidth_slice, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &one, |
| }, |
| #endif |
| #ifdef CONFIG_PROVE_LOCKING |
| { |
| .procname = "prove_locking", |
| .data = &prove_locking, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_LOCK_STAT |
| { |
| .procname = "lock_stat", |
| .data = &lock_stat, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "panic", |
| .data = &panic_timeout, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #ifdef CONFIG_COREDUMP |
| { |
| .procname = "core_uses_pid", |
| .data = &core_uses_pid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "core_pattern", |
| .data = core_pattern, |
| .maxlen = CORENAME_MAX_SIZE, |
| .mode = 0644, |
| .proc_handler = proc_dostring_coredump, |
| }, |
| { |
| .procname = "core_pipe_limit", |
| .data = &core_pipe_limit, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_PROC_SYSCTL |
| { |
| .procname = "tainted", |
| .maxlen = sizeof(long), |
| .mode = 0644, |
| .proc_handler = proc_taint, |
| }, |
| { |
| .procname = "sysctl_writes_strict", |
| .data = &sysctl_writes_strict, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &neg_one, |
| .extra2 = &one, |
| }, |
| #endif |
| #ifdef CONFIG_LATENCYTOP |
| { |
| .procname = "latencytop", |
| .data = &latencytop_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sysctl_latencytop, |
| }, |
| #endif |
| #ifdef CONFIG_BLK_DEV_INITRD |
| { |
| .procname = "real-root-dev", |
| .data = &real_root_dev, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "print-fatal-signals", |
| .data = &print_fatal_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #ifdef CONFIG_SPARC |
| { |
| .procname = "reboot-cmd", |
| .data = reboot_command, |
| .maxlen = 256, |
| .mode = 0644, |
| .proc_handler = proc_dostring, |
| }, |
| { |
| .procname = "stop-a", |
| .data = &stop_a_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "scons-poweroff", |
| .data = &scons_pwroff, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_SPARC64 |
| { |
| .procname = "tsb-ratio", |
| .data = &sysctl_tsb_ratio, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef __hppa__ |
| { |
| .procname = "soft-power", |
| .data = &pwrsw_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW |
| { |
| .procname = "unaligned-trap", |
| .data = &unaligned_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "ctrl-alt-del", |
| .data = &C_A_D, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #ifdef CONFIG_FUNCTION_TRACER |
| { |
| .procname = "ftrace_enabled", |
| .data = &ftrace_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = ftrace_enable_sysctl, |
| }, |
| #endif |
| #ifdef CONFIG_STACK_TRACER |
| { |
| .procname = "stack_tracer_enabled", |
| .data = &stack_tracer_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = stack_trace_sysctl, |
| }, |
| #endif |
| #ifdef CONFIG_TRACING |
| { |
| .procname = "ftrace_dump_on_oops", |
| .data = &ftrace_dump_on_oops, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "traceoff_on_warning", |
| .data = &__disable_trace_on_warning, |
| .maxlen = sizeof(__disable_trace_on_warning), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "tracepoint_printk", |
| .data = &tracepoint_printk, |
| .maxlen = sizeof(tracepoint_printk), |
| .mode = 0644, |
| .proc_handler = tracepoint_printk_sysctl, |
| }, |
| #endif |
| #ifdef CONFIG_KEXEC_CORE |
| { |
| .procname = "kexec_load_disabled", |
| .data = &kexec_load_disabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| /* only handle a transition from default "0" to "1" */ |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &one, |
| .extra2 = &one, |
| }, |
| #endif |
| #ifdef CONFIG_MODULES |
| { |
| .procname = "modprobe", |
| .data = &modprobe_path, |
| .maxlen = KMOD_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = proc_dostring, |
| }, |
| { |
| .procname = "modules_disabled", |
| .data = &modules_disabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| /* only handle a transition from default "0" to "1" */ |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &one, |
| .extra2 = &one, |
| }, |
| #endif |
| #ifdef CONFIG_UEVENT_HELPER |
| { |
| .procname = "hotplug", |
| .data = &uevent_helper, |
| .maxlen = UEVENT_HELPER_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = proc_dostring, |
| }, |
| #endif |
| #ifdef CONFIG_CHR_DEV_SG |
| { |
| .procname = "sg-big-buff", |
| .data = &sg_big_buff, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_BSD_PROCESS_ACCT |
| { |
| .procname = "acct", |
| .data = &acct_parm, |
| .maxlen = 3*sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_MAGIC_SYSRQ |
| { |
| .procname = "sysrq", |
| .data = &__sysrq_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = sysrq_sysctl_handler, |
| }, |
| #endif |
| #ifdef CONFIG_PROC_SYSCTL |
| { |
| .procname = "cad_pid", |
| .data = NULL, |
| .maxlen = sizeof (int), |
| .mode = 0600, |
| .proc_handler = proc_do_cad_pid, |
| }, |
| #endif |
| { |
| .procname = "threads-max", |
| .data = NULL, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sysctl_max_threads, |
| }, |
| { |
| .procname = "random", |
| .mode = 0555, |
| .child = random_table, |
| }, |
| { |
| .procname = "usermodehelper", |
| .mode = 0555, |
| .child = usermodehelper_table, |
| }, |
| { |
| .procname = "overflowuid", |
| .data = &overflowuid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| { |
| .procname = "overflowgid", |
| .data = &overflowgid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| #ifdef CONFIG_S390 |
| #ifdef CONFIG_MATHEMU |
| { |
| .procname = "ieee_emulation_warnings", |
| .data = &sysctl_ieee_emulation_warnings, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "userprocess_debug", |
| .data = &show_unhandled_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "pid_max", |
| .data = &pid_max, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &pid_max_min, |
| .extra2 = &pid_max_max, |
| }, |
| { |
| .procname = "panic_on_oops", |
| .data = &panic_on_oops, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #if defined CONFIG_PRINTK |
| { |
| .procname = "printk", |
| .data = &console_loglevel, |
| .maxlen = 4*sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "printk_ratelimit", |
| .data = &printk_ratelimit_state.interval, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "printk_ratelimit_burst", |
| .data = &printk_ratelimit_state.burst, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "printk_delay", |
| .data = &printk_delay_msec, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &ten_thousand, |
| }, |
| { |
| .procname = "printk_devkmsg", |
| .data = devkmsg_log_str, |
| .maxlen = DEVKMSG_STR_MAX_SIZE, |
| .mode = 0644, |
| .proc_handler = devkmsg_sysctl_set_loglvl, |
| }, |
| { |
| .procname = "dmesg_restrict", |
| .data = &dmesg_restrict, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax_sysadmin, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "kptr_restrict", |
| .data = &kptr_restrict, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax_sysadmin, |
| .extra1 = &zero, |
| .extra2 = &two, |
| }, |
| #endif |
| { |
| .procname = "ngroups_max", |
| .data = &ngroups_max, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "cap_last_cap", |
| .data = (void *)&cap_last_cap, |
| .maxlen = sizeof(int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| #if defined(CONFIG_LOCKUP_DETECTOR) |
| { |
| .procname = "watchdog", |
| .data = &watchdog_user_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_watchdog, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "watchdog_thresh", |
| .data = &watchdog_thresh, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_watchdog_thresh, |
| .extra1 = &zero, |
| .extra2 = &sixty, |
| }, |
| { |
| .procname = "nmi_watchdog", |
| .data = &nmi_watchdog_user_enabled, |
| .maxlen = sizeof(int), |
| .mode = NMI_WATCHDOG_SYSCTL_PERM, |
| .proc_handler = proc_nmi_watchdog, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "watchdog_cpumask", |
| .data = &watchdog_cpumask_bits, |
| .maxlen = NR_CPUS, |
| .mode = 0644, |
| .proc_handler = proc_watchdog_cpumask, |
| }, |
| #ifdef CONFIG_SOFTLOCKUP_DETECTOR |
| { |
| .procname = "soft_watchdog", |
| .data = &soft_watchdog_user_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_soft_watchdog, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "softlockup_panic", |
| .data = &softlockup_panic, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #ifdef CONFIG_SMP |
| { |
| .procname = "softlockup_all_cpu_backtrace", |
| .data = &sysctl_softlockup_all_cpu_backtrace, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif /* CONFIG_SMP */ |
| #endif |
| #ifdef CONFIG_HARDLOCKUP_DETECTOR |
| { |
| .procname = "hardlockup_panic", |
| .data = &hardlockup_panic, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #ifdef CONFIG_SMP |
| { |
| .procname = "hardlockup_all_cpu_backtrace", |
| .data = &sysctl_hardlockup_all_cpu_backtrace, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif /* CONFIG_SMP */ |
| #endif |
| #endif |
| |
| #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
| { |
| .procname = "unknown_nmi_panic", |
| .data = &unknown_nmi_panic, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_X86) |
| { |
| .procname = "panic_on_unrecovered_nmi", |
| .data = &panic_on_unrecovered_nmi, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "panic_on_io_nmi", |
| .data = &panic_on_io_nmi, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #ifdef CONFIG_DEBUG_STACKOVERFLOW |
| { |
| .procname = "panic_on_stackoverflow", |
| .data = &sysctl_panic_on_stackoverflow, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "bootloader_type", |
| .data = &bootloader_type, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "bootloader_version", |
| .data = &bootloader_version, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "io_delay_type", |
| .data = &io_delay_type, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_MMU) |
| { |
| .procname = "randomize_va_space", |
| .data = &randomize_va_space, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_S390) && defined(CONFIG_SMP) |
| { |
| .procname = "spin_retry", |
| .data = &spin_retry, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) |
| { |
| .procname = "acpi_video_flags", |
| .data = &acpi_realmode_flags, |
| .maxlen = sizeof (unsigned long), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| #endif |
| #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN |
| { |
| .procname = "ignore-unaligned-usertrap", |
| .data = &no_unaligned_warning, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_IA64 |
| { |
| .procname = "unaligned-dump-stack", |
| .data = &unaligned_dump_stack, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_DETECT_HUNG_TASK |
| { |
| .procname = "hung_task_panic", |
| .data = &sysctl_hung_task_panic, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "hung_task_check_count", |
| .data = &sysctl_hung_task_check_count, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| }, |
| { |
| .procname = "hung_task_timeout_secs", |
| .data = &sysctl_hung_task_timeout_secs, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = proc_dohung_task_timeout_secs, |
| .extra2 = &hung_task_timeout_max, |
| }, |
| { |
| .procname = "hung_task_warnings", |
| .data = &sysctl_hung_task_warnings, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &neg_one, |
| }, |
| #endif |
| #ifdef CONFIG_RT_MUTEXES |
| { |
| .procname = "max_lock_depth", |
| .data = &max_lock_depth, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "poweroff_cmd", |
| .data = &poweroff_cmd, |
| .maxlen = POWEROFF_CMD_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = proc_dostring, |
| }, |
| #ifdef CONFIG_KEYS |
| { |
| .procname = "keys", |
| .mode = 0555, |
| .child = key_sysctls, |
| }, |
| #endif |
| #ifdef CONFIG_PERF_EVENTS |
| /* |
| * User-space scripts rely on the existence of this file |
| * as a feature check for perf_events being enabled. |
| * |
| * So it's an ABI, do not remove! |
| */ |
| { |
| .procname = "perf_event_paranoid", |
| .data = &sysctl_perf_event_paranoid, |
| .maxlen = sizeof(sysctl_perf_event_paranoid), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "perf_event_mlock_kb", |
| .data = &sysctl_perf_event_mlock, |
| .maxlen = sizeof(sysctl_perf_event_mlock), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "perf_event_max_sample_rate", |
| .data = &sysctl_perf_event_sample_rate, |
| .maxlen = sizeof(sysctl_perf_event_sample_rate), |
| .mode = 0644, |
| .proc_handler = perf_proc_update_handler, |
| .extra1 = &one, |
| }, |
| { |
| .procname = "perf_cpu_time_max_percent", |
| .data = &sysctl_perf_cpu_time_max_percent, |
| .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), |
| .mode = 0644, |
| .proc_handler = perf_cpu_time_max_percent_handler, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| { |
| .procname = "perf_event_max_stack", |
| .data = &sysctl_perf_event_max_stack, |
| .maxlen = sizeof(sysctl_perf_event_max_stack), |
| .mode = 0644, |
| .proc_handler = perf_event_max_stack_handler, |
| .extra1 = &zero, |
| .extra2 = &six_hundred_forty_kb, |
| }, |
| { |
| .procname = "perf_event_max_contexts_per_stack", |
| .data = &sysctl_perf_event_max_contexts_per_stack, |
| .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), |
| .mode = 0644, |
| .proc_handler = perf_event_max_stack_handler, |
| .extra1 = &zero, |
| .extra2 = &one_thousand, |
| }, |
| #endif |
| { |
| .procname = "panic_on_warn", |
| .data = &panic_on_warn, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
| { |
| .procname = "timer_migration", |
| .data = &sysctl_timer_migration, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = timer_migration_handler, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| #ifdef CONFIG_BPF_SYSCALL |
| { |
| .procname = "unprivileged_bpf_disabled", |
| .data = &sysctl_unprivileged_bpf_disabled, |
| .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), |
| .mode = 0644, |
| /* only handle a transition from default "0" to "1" */ |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &one, |
| .extra2 = &one, |
| }, |
| #endif |
| #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) |
| { |
| .procname = "panic_on_rcu_stall", |
| .data = &sysctl_panic_on_rcu_stall, |
| .maxlen = sizeof(sysctl_panic_on_rcu_stall), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| { } |
| }; |
| |
| static struct ctl_table vm_table[] = { |
| { |
| .procname = "overcommit_memory", |
| .data = &sysctl_overcommit_memory, |
| .maxlen = sizeof(sysctl_overcommit_memory), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &two, |
| }, |
| { |
| .procname = "panic_on_oom", |
| .data = &sysctl_panic_on_oom, |
| .maxlen = sizeof(sysctl_panic_on_oom), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &two, |
| }, |
| { |
| .procname = "oom_kill_allocating_task", |
| .data = &sysctl_oom_kill_allocating_task, |
| .maxlen = sizeof(sysctl_oom_kill_allocating_task), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "oom_dump_tasks", |
| .data = &sysctl_oom_dump_tasks, |
| .maxlen = sizeof(sysctl_oom_dump_tasks), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "overcommit_ratio", |
| .data = &sysctl_overcommit_ratio, |
| .maxlen = sizeof(sysctl_overcommit_ratio), |
| .mode = 0644, |
| .proc_handler = overcommit_ratio_handler, |
| }, |
| { |
| .procname = "overcommit_kbytes", |
| .data = &sysctl_overcommit_kbytes, |
| .maxlen = sizeof(sysctl_overcommit_kbytes), |
| .mode = 0644, |
| .proc_handler = overcommit_kbytes_handler, |
| }, |
| { |
| .procname = "page-cluster", |
| .data = &page_cluster, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| }, |
| { |
| .procname = "dirty_background_ratio", |
| .data = &dirty_background_ratio, |
| .maxlen = sizeof(dirty_background_ratio), |
| .mode = 0644, |
| .proc_handler = dirty_background_ratio_handler, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| { |
| .procname = "dirty_background_bytes", |
| .data = &dirty_background_bytes, |
| .maxlen = sizeof(dirty_background_bytes), |
| .mode = 0644, |
| .proc_handler = dirty_background_bytes_handler, |
| .extra1 = &one_ul, |
| }, |
| { |
| .procname = "dirty_ratio", |
| .data = &vm_dirty_ratio, |
| .maxlen = sizeof(vm_dirty_ratio), |
| .mode = 0644, |
| .proc_handler = dirty_ratio_handler, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| { |
| .procname = "dirty_bytes", |
| .data = &vm_dirty_bytes, |
| .maxlen = sizeof(vm_dirty_bytes), |
| .mode = 0644, |
| .proc_handler = dirty_bytes_handler, |
| .extra1 = &dirty_bytes_min, |
| }, |
| { |
| .procname = "dirty_writeback_centisecs", |
| .data = &dirty_writeback_interval, |
| .maxlen = sizeof(dirty_writeback_interval), |
| .mode = 0644, |
| .proc_handler = dirty_writeback_centisecs_handler, |
| }, |
| { |
| .procname = "dirty_expire_centisecs", |
| .data = &dirty_expire_interval, |
| .maxlen = sizeof(dirty_expire_interval), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| }, |
| { |
| .procname = "dirtytime_expire_seconds", |
| .data = &dirtytime_expire_interval, |
| .maxlen = sizeof(dirty_expire_interval), |
| .mode = 0644, |
| .proc_handler = dirtytime_interval_handler, |
| .extra1 = &zero, |
| }, |
| { |
| .procname = "swappiness", |
| .data = &vm_swappiness, |
| .maxlen = sizeof(vm_swappiness), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| #ifdef CONFIG_HUGETLB_PAGE |
| { |
| .procname = "nr_hugepages", |
| .data = NULL, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = hugetlb_sysctl_handler, |
| }, |
| #ifdef CONFIG_NUMA |
| { |
| .procname = "nr_hugepages_mempolicy", |
| .data = NULL, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &hugetlb_mempolicy_sysctl_handler, |
| }, |
| { |
| .procname = "numa_stat", |
| .data = &sysctl_vm_numa_stat, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sysctl_vm_numa_stat_handler, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| { |
| .procname = "hugetlb_shm_group", |
| .data = &sysctl_hugetlb_shm_group, |
| .maxlen = sizeof(gid_t), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| { |
| .procname = "nr_overcommit_hugepages", |
| .data = NULL, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = hugetlb_overcommit_handler, |
| }, |
| #endif |
| { |
| .procname = "lowmem_reserve_ratio", |
| .data = &sysctl_lowmem_reserve_ratio, |
| .maxlen = sizeof(sysctl_lowmem_reserve_ratio), |
| .mode = 0644, |
| .proc_handler = lowmem_reserve_ratio_sysctl_handler, |
| }, |
| { |
| .procname = "drop_caches", |
| .data = &sysctl_drop_caches, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = drop_caches_sysctl_handler, |
| .extra1 = &one, |
| .extra2 = &four, |
| }, |
| #ifdef CONFIG_COMPACTION |
| { |
| .procname = "compact_memory", |
| .data = &sysctl_compact_memory, |
| .maxlen = sizeof(int), |
| .mode = 0200, |
| .proc_handler = sysctl_compaction_handler, |
| }, |
| { |
| .procname = "extfrag_threshold", |
| .data = &sysctl_extfrag_threshold, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = sysctl_extfrag_handler, |
| .extra1 = &min_extfrag_threshold, |
| .extra2 = &max_extfrag_threshold, |
| }, |
| { |
| .procname = "compact_unevictable_allowed", |
| .data = &sysctl_compact_unevictable_allowed, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| |
| #endif /* CONFIG_COMPACTION */ |
| { |
| .procname = "min_free_kbytes", |
| .data = &min_free_kbytes, |
| .maxlen = sizeof(min_free_kbytes), |
| .mode = 0644, |
| .proc_handler = min_free_kbytes_sysctl_handler, |
| .extra1 = &zero, |
| }, |
| { |
| .procname = "watermark_scale_factor", |
| .data = &watermark_scale_factor, |
| .maxlen = sizeof(watermark_scale_factor), |
| .mode = 0644, |
| .proc_handler = watermark_scale_factor_sysctl_handler, |
| .extra1 = &one, |
| .extra2 = &one_thousand, |
| }, |
| { |
| .procname = "percpu_pagelist_fraction", |
| .data = &percpu_pagelist_fraction, |
| .maxlen = sizeof(percpu_pagelist_fraction), |
| .mode = 0644, |
| .proc_handler = percpu_pagelist_fraction_sysctl_handler, |
| .extra1 = &zero, |
| }, |
| #ifdef CONFIG_MMU |
| { |
| .procname = "max_map_count", |
| .data = &sysctl_max_map_count, |
| .maxlen = sizeof(sysctl_max_map_count), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| }, |
| #else |
| { |
| .procname = "nr_trim_pages", |
| .data = &sysctl_nr_trim_pages, |
| .maxlen = sizeof(sysctl_nr_trim_pages), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| }, |
| #endif |
| { |
| .procname = "laptop_mode", |
| .data = &laptop_mode, |
| .maxlen = sizeof(laptop_mode), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "block_dump", |
| .data = &block_dump, |
| .maxlen = sizeof(block_dump), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| .extra1 = &zero, |
| }, |
| { |
| .procname = "vfs_cache_pressure", |
| .data = &sysctl_vfs_cache_pressure, |
| .maxlen = sizeof(sysctl_vfs_cache_pressure), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| .extra1 = &zero, |
| }, |
| #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| { |
| .procname = "legacy_va_layout", |
| .data = &sysctl_legacy_va_layout, |
| .maxlen = sizeof(sysctl_legacy_va_layout), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| .extra1 = &zero, |
| }, |
| #endif |
| #ifdef CONFIG_NUMA |
| { |
| .procname = "zone_reclaim_mode", |
| .data = &node_reclaim_mode, |
| .maxlen = sizeof(node_reclaim_mode), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| .extra1 = &zero, |
| }, |
| { |
| .procname = "min_unmapped_ratio", |
| .data = &sysctl_min_unmapped_ratio, |
| .maxlen = sizeof(sysctl_min_unmapped_ratio), |
| .mode = 0644, |
| .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| { |
| .procname = "min_slab_ratio", |
| .data = &sysctl_min_slab_ratio, |
| .maxlen = sizeof(sysctl_min_slab_ratio), |
| .mode = 0644, |
| .proc_handler = sysctl_min_slab_ratio_sysctl_handler, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| #endif |
| #ifdef CONFIG_SMP |
| { |
| .procname = "stat_interval", |
| .data = &sysctl_stat_interval, |
| .maxlen = sizeof(sysctl_stat_interval), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "stat_refresh", |
| .data = NULL, |
| .maxlen = 0, |
| .mode = 0600, |
| .proc_handler = vmstat_refresh, |
| }, |
| #endif |
| #ifdef CONFIG_MMU |
| { |
| .procname = "mmap_min_addr", |
| .data = &dac_mmap_min_addr, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = mmap_min_addr_handler, |
| }, |
| #endif |
| #ifdef CONFIG_NUMA |
| { |
| .procname = "numa_zonelist_order", |
| .data = &numa_zonelist_order, |
| .maxlen = NUMA_ZONELIST_ORDER_LEN, |
| .mode = 0644, |
| .proc_handler = numa_zonelist_order_handler, |
| }, |
| #endif |
| #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
| (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
| { |
| .procname = "vdso_enabled", |
| #ifdef CONFIG_X86_32 |
| .data = &vdso32_enabled, |
| .maxlen = sizeof(vdso32_enabled), |
| #else |
| .data = &vdso_enabled, |
| .maxlen = sizeof(vdso_enabled), |
| #endif |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| .extra1 = &zero, |
| }, |
| #endif |
| #ifdef CONFIG_HIGHMEM |
| { |
| .procname = "highmem_is_dirtyable", |
| .data = &vm_highmem_is_dirtyable, |
| .maxlen = sizeof(vm_highmem_is_dirtyable), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| #ifdef CONFIG_MEMORY_FAILURE |
| { |
| .procname = "memory_failure_early_kill", |
| .data = &sysctl_memory_failure_early_kill, |
| .maxlen = sizeof(sysctl_memory_failure_early_kill), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "memory_failure_recovery", |
| .data = &sysctl_memory_failure_recovery, |
| .maxlen = sizeof(sysctl_memory_failure_recovery), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| { |
| .procname = "user_reserve_kbytes", |
| .data = &sysctl_user_reserve_kbytes, |
| .maxlen = sizeof(sysctl_user_reserve_kbytes), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| { |
| .procname = "admin_reserve_kbytes", |
| .data = &sysctl_admin_reserve_kbytes, |
| .maxlen = sizeof(sysctl_admin_reserve_kbytes), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS |
| { |
| .procname = "mmap_rnd_bits", |
| .data = &mmap_rnd_bits, |
| .maxlen = sizeof(mmap_rnd_bits), |
| .mode = 0600, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = (void *)&mmap_rnd_bits_min, |
| .extra2 = (void *)&mmap_rnd_bits_max, |
| }, |
| #endif |
| #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS |
| { |
| .procname = "mmap_rnd_compat_bits", |
| .data = &mmap_rnd_compat_bits, |
| .maxlen = sizeof(mmap_rnd_compat_bits), |
| .mode = 0600, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = (void *)&mmap_rnd_compat_bits_min, |
| .extra2 = (void *)&mmap_rnd_compat_bits_max, |
| }, |
| #endif |
| { } |
| }; |
| |
| static struct ctl_table fs_table[] = { |
| { |
| .procname = "inode-nr", |
| .data = &inodes_stat, |
| .maxlen = 2*sizeof(long), |
| .mode = 0444, |
| .proc_handler = proc_nr_inodes, |
| }, |
| { |
| .procname = "inode-state", |
| .data = &inodes_stat, |
| .maxlen = 7*sizeof(long), |
| .mode = 0444, |
| .proc_handler = proc_nr_inodes, |
| }, |
| { |
| .procname = "file-nr", |
| .data = &files_stat, |
| .maxlen = sizeof(files_stat), |
| .mode = 0444, |
| .proc_handler = proc_nr_files, |
| }, |
| { |
| .procname = "file-max", |
| .data = &files_stat.max_files, |
| .maxlen = sizeof(files_stat.max_files), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| { |
| .procname = "nr_open", |
| .data = &sysctl_nr_open, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &sysctl_nr_open_min, |
| .extra2 = &sysctl_nr_open_max, |
| }, |
| { |
| .procname = "dentry-state", |
| .data = &dentry_stat, |
| .maxlen = 6*sizeof(long), |
| .mode = 0444, |
| .proc_handler = proc_nr_dentry, |
| }, |
| { |
| .procname = "overflowuid", |
| .data = &fs_overflowuid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| { |
| .procname = "overflowgid", |
| .data = &fs_overflowgid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| #ifdef CONFIG_FILE_LOCKING |
| { |
| .procname = "leases-enable", |
| .data = &leases_enable, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_DNOTIFY |
| { |
| .procname = "dir-notify-enable", |
| .data = &dir_notify_enable, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_MMU |
| #ifdef CONFIG_FILE_LOCKING |
| { |
| .procname = "lease-break-time", |
| .data = &lease_break_time, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_AIO |
| { |
| .procname = "aio-nr", |
| .data = &aio_nr, |
| .maxlen = sizeof(aio_nr), |
| .mode = 0444, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| { |
| .procname = "aio-max-nr", |
| .data = &aio_max_nr, |
| .maxlen = sizeof(aio_max_nr), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| #endif /* CONFIG_AIO */ |
| #ifdef CONFIG_INOTIFY_USER |
| { |
| .procname = "inotify", |
| .mode = 0555, |
| .child = inotify_table, |
| }, |
| #endif |
| #ifdef CONFIG_EPOLL |
| { |
| .procname = "epoll", |
| .mode = 0555, |
| .child = epoll_table, |
| }, |
| #endif |
| #endif |
| { |
| .procname = "protected_symlinks", |
| .data = &sysctl_protected_symlinks, |
| .maxlen = sizeof(int), |
| .mode = 0600, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "protected_hardlinks", |
| .data = &sysctl_protected_hardlinks, |
| .maxlen = sizeof(int), |
| .mode = 0600, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| { |
| .procname = "suid_dumpable", |
| .data = &suid_dumpable, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax_coredump, |
| .extra1 = &zero, |
| .extra2 = &two, |
| }, |
| #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
| { |
| .procname = "binfmt_misc", |
| .mode = 0555, |
| .child = sysctl_mount_point, |
| }, |
| #endif |
| { |
| .procname = "pipe-max-size", |
| .data = &pipe_max_size, |
| .maxlen = sizeof(pipe_max_size), |
| .mode = 0644, |
| .proc_handler = &pipe_proc_fn, |
| .extra1 = &pipe_min_size, |
| }, |
| { |
| .procname = "pipe-user-pages-hard", |
| .data = &pipe_user_pages_hard, |
| .maxlen = sizeof(pipe_user_pages_hard), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| { |
| .procname = "pipe-user-pages-soft", |
| .data = &pipe_user_pages_soft, |
| .maxlen = sizeof(pipe_user_pages_soft), |
| .mode = 0644, |
| .proc_handler = proc_doulongvec_minmax, |
| }, |
| { |
| .procname = "mount-max", |
| .data = &sysctl_mount_max, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_minmax, |
| .extra1 = &one, |
| }, |
| { } |
| }; |
| |
| static struct ctl_table debug_table[] = { |
| #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE |
| { |
| .procname = "exception-trace", |
| .data = &show_unhandled_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec |
| }, |
| #endif |
| #if defined(CONFIG_OPTPROBES) |
| { |
| .procname = "kprobes-optimization", |
| .data = &sysctl_kprobes_optimization, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_kprobes_optimization_handler, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| { } |
| }; |
| |
| static struct ctl_table dev_table[] = { |
| { } |
| }; |
| |
| int __init sysctl_init(void) |
| { |
| struct ctl_table_header *hdr; |
| |
| hdr = register_sysctl_table(sysctl_base_table); |
| kmemleak_not_leak(hdr); |
| return 0; |
| } |
| |
| #endif /* CONFIG_SYSCTL */ |
| |
| /* |
| * /proc/sys support |
| */ |
| |
| #ifdef CONFIG_PROC_SYSCTL |
| |
| static int _proc_do_string(char *data, int maxlen, int write, |
| char __user *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| size_t len; |
| char __user *p; |
| char c; |
| |
| if (!data || !maxlen || !*lenp) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| if (write) { |
| if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { |
| /* Only continue writes not past the end of buffer. */ |
| len = strlen(data); |
| if (len > maxlen - 1) |
| len = maxlen - 1; |
| |
| if (*ppos > len) |
| return 0; |
| len = *ppos; |
| } else { |
| /* Start writing from beginning of buffer. */ |
| len = 0; |
| } |
| |
| *ppos += *lenp; |
| p = buffer; |
| while ((p - buffer) < *lenp && len < maxlen - 1) { |
| if (get_user(c, p++)) |
| return -EFAULT; |
| if (c == 0 || c == '\n') |
| break; |
| data[len++] = c; |
| } |
| data[len] = 0; |
| } else { |
| len = strlen(data); |
| if (len > maxlen) |
| len = maxlen; |
| |
| if (*ppos > len) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| data += *ppos; |
| len -= *ppos; |
| |
| if (len > *lenp) |
| len = *lenp; |
| if (len) |
| if (copy_to_user(buffer, data, len)) |
| return -EFAULT; |
| if (len < *lenp) { |
| if (put_user('\n', buffer + len)) |
| return -EFAULT; |
| len++; |
| } |
| *lenp = len; |
| *ppos += len; |
| } |
| return 0; |
| } |
| |
| static void warn_sysctl_write(struct ctl_table *table) |
| { |
| pr_warn_once("%s wrote to %s when file position was not 0!\n" |
| "This will not be supported in the future. To silence this\n" |
| "warning, set kernel.sysctl_writes_strict = -1\n", |
| current->comm, table->procname); |
| } |
| |
| /** |
| * proc_first_pos_non_zero_ignore - check if firs position is allowed |
| * @ppos: file position |
| * @table: the sysctl table |
| * |
| * Returns true if the first position is non-zero and the sysctl_writes_strict |
| * mode indicates this is not allowed for numeric input types. String proc |
| * hadlers can ignore the return value. |
| */ |
| static bool proc_first_pos_non_zero_ignore(loff_t *ppos, |
| struct ctl_table *table) |
| { |
| if (!*ppos) |
| return false; |
| |
| switch (sysctl_writes_strict) { |
| case SYSCTL_WRITES_STRICT: |
| return true; |
| case SYSCTL_WRITES_WARN: |
| warn_sysctl_write(table); |
| return false; |
| default: |
| return false; |
| } |
| } |
| |
| /** |
| * proc_dostring - read a string sysctl |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes a string from/to the user buffer. If the kernel |
| * buffer provided is not large enough to hold the string, the |
| * string is truncated. The copied string is %NULL-terminated. |
| * If the string is being read by the user process, it is copied |
| * and a newline '\n' is added. It is truncated if the buffer is |
| * not large enough. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dostring(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| if (write) |
| proc_first_pos_non_zero_ignore(ppos, table); |
| |
| return _proc_do_string((char *)(table->data), table->maxlen, write, |
| (char __user *)buffer, lenp, ppos); |
| } |
| |
| static size_t proc_skip_spaces(char **buf) |
| { |
| size_t ret; |
| char *tmp = skip_spaces(*buf); |
| ret = tmp - *buf; |
| *buf = tmp; |
| return ret; |
| } |
| |
| static void proc_skip_char(char **buf, size_t *size, const char v) |
| { |
| while (*size) { |
| if (**buf != v) |
| break; |
| (*size)--; |
| (*buf)++; |
| } |
| } |
| |
| #define TMPBUFLEN 22 |
| /** |
| * proc_get_long - reads an ASCII formatted integer from a user buffer |
| * |
| * @buf: a kernel buffer |
| * @size: size of the kernel buffer |
| * @val: this is where the number will be stored |
| * @neg: set to %TRUE if number is negative |
| * @perm_tr: a vector which contains the allowed trailers |
| * @perm_tr_len: size of the perm_tr vector |
| * @tr: pointer to store the trailer character |
| * |
| * In case of success %0 is returned and @buf and @size are updated with |
| * the amount of bytes read. If @tr is non-NULL and a trailing |
| * character exists (size is non-zero after returning from this |
| * function), @tr is updated with the trailing character. |
| */ |
| static int proc_get_long(char **buf, size_t *size, |
| unsigned long *val, bool *neg, |
| const char *perm_tr, unsigned perm_tr_len, char *tr) |
| { |
| int len; |
| char *p, tmp[TMPBUFLEN]; |
| |
| if (!*size) |
| return -EINVAL; |
| |
| len = *size; |
| if (len > TMPBUFLEN - 1) |
| len = TMPBUFLEN - 1; |
| |
| memcpy(tmp, *buf, len); |
| |
| tmp[len] = 0; |
| p = tmp; |
| if (*p == '-' && *size > 1) { |
| *neg = true; |
| p++; |
| } else |
| *neg = false; |
| if (!isdigit(*p)) |
| return -EINVAL; |
| |
| *val = simple_strtoul(p, &p, 0); |
| |
| len = p - tmp; |
| |
| /* We don't know if the next char is whitespace thus we may accept |
| * invalid integers (e.g. 1234...a) or two integers instead of one |
| * (e.g. 123...1). So lets not allow such large numbers. */ |
| if (len == TMPBUFLEN - 1) |
| return -EINVAL; |
| |
| if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) |
| return -EINVAL; |
| |
| if (tr && (len < *size)) |
| *tr = *p; |
| |
| *buf += len; |
| *size -= len; |
| |
| return 0; |
| } |
| |
| /** |
| * proc_put_long - converts an integer to a decimal ASCII formatted string |
| * |
| * @buf: the user buffer |
| * @size: the size of the user buffer |
| * @val: the integer to be converted |
| * @neg: sign of the number, %TRUE for negative |
| * |
| * In case of success %0 is returned and @buf and @size are updated with |
| * the amount of bytes written. |
| */ |
| static int proc_put_long(void __user **buf, size_t *size, unsigned long val, |
| bool neg) |
| { |
| int len; |
| char tmp[TMPBUFLEN], *p = tmp; |
| |
| sprintf(p, "%s%lu", neg ? "-" : "", val); |
| len = strlen(tmp); |
| if (len > *size) |
| len = *size; |
| if (copy_to_user(*buf, tmp, len)) |
| return -EFAULT; |
| *size -= len; |
| *buf += len; |
| return 0; |
| } |
| #undef TMPBUFLEN |
| |
| static int proc_put_char(void __user **buf, size_t *size, char c) |
| { |
| if (*size) { |
| char __user **buffer = (char __user **)buf; |
| if (put_user(c, *buffer)) |
| return -EFAULT; |
| (*size)--, (*buffer)++; |
| *buf = *buffer; |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (*negp) { |
| if (*lvalp > (unsigned long) INT_MAX + 1) |
| return -EINVAL; |
| *valp = -*lvalp; |
| } else { |
| if (*lvalp > (unsigned long) INT_MAX) |
| return -EINVAL; |
| *valp = *lvalp; |
| } |
| } else { |
| int val = *valp; |
| if (val < 0) { |
| *negp = true; |
| *lvalp = -(unsigned long)val; |
| } else { |
| *negp = false; |
| *lvalp = (unsigned long)val; |
| } |
| } |
| return 0; |
| } |
| |
| static int do_proc_douintvec_conv(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (*lvalp > UINT_MAX) |
| return -EINVAL; |
| *valp = *lvalp; |
| } else { |
| unsigned int val = *valp; |
| *lvalp = (unsigned long)val; |
| } |
| return 0; |
| } |
| |
| static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
| |
| static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
| int write, void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
| int write, void *data), |
| void *data) |
| { |
| int *i, vleft, first = 1, err = 0; |
| size_t left; |
| char *kbuf = NULL, *p; |
| |
| if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| i = (int *) tbl_data; |
| vleft = table->maxlen / sizeof(*i); |
| left = *lenp; |
| |
| if (!conv) |
| conv = do_proc_dointvec_conv; |
| |
| if (write) { |
| if (proc_first_pos_non_zero_ignore(ppos, table)) |
| goto out; |
| |
| if (left > PAGE_SIZE - 1) |
| left = PAGE_SIZE - 1; |
| p = kbuf = memdup_user_nul(buffer, left); |
| if (IS_ERR(kbuf)) |
| return PTR_ERR(kbuf); |
| } |
| |
| for (; left && vleft--; i++, first=0) { |
| unsigned long lval; |
| bool neg; |
| |
| if (write) { |
| left -= proc_skip_spaces(&p); |
| |
| if (!left) |
| break; |
| err = proc_get_long(&p, &left, &lval, &neg, |
| proc_wspace_sep, |
| sizeof(proc_wspace_sep), NULL); |
| if (err) |
| break; |
| if (conv(&neg, &lval, i, 1, data)) { |
| err = -EINVAL; |
| break; |
| } |
| } else { |
| if (conv(&neg, &lval, i, 0, data)) { |
| err = -EINVAL; |
| break; |
| } |
| if (!first) |
| err = proc_put_char(&buffer, &left, '\t'); |
| if (err) |
| break; |
| err = proc_put_long(&buffer, &left, lval, neg); |
| if (err) |
| break; |
| } |
| } |
| |
| if (!write && !first && left && !err) |
| err = proc_put_char(&buffer, &left, '\n'); |
| if (write && !err && left) |
| left -= proc_skip_spaces(&p); |
| if (write) { |
| kfree(kbuf); |
| if (first) |
| return err ? : -EINVAL; |
| } |
| *lenp -= left; |
| out: |
| *ppos += *lenp; |
| return err; |
| } |
| |
| static int do_proc_dointvec(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos, |
| int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
| int write, void *data), |
| void *data) |
| { |
| return __do_proc_dointvec(table->data, table, write, |
| buffer, lenp, ppos, conv, data); |
| } |
| |
| static int do_proc_douintvec_w(unsigned int *tbl_data, |
| struct ctl_table *table, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| unsigned long lval; |
| int err = 0; |
| size_t left; |
| bool neg; |
| char *kbuf = NULL, *p; |
| |
| left = *lenp; |
| |
| if (proc_first_pos_non_zero_ignore(ppos, table)) |
| goto bail_early; |
| |
| if (left > PAGE_SIZE - 1) |
| left = PAGE_SIZE - 1; |
| |
| p = kbuf = memdup_user_nul(buffer, left); |
| if (IS_ERR(kbuf)) |
| return -EINVAL; |
| |
| left -= proc_skip_spaces(&p); |
| if (!left) { |
| err = -EINVAL; |
| goto out_free; |
| } |
| |
| err = proc_get_long(&p, &left, &lval, &neg, |
| proc_wspace_sep, |
| sizeof(proc_wspace_sep), NULL); |
| if (err || neg) { |
| err = -EINVAL; |
| goto out_free; |
| } |
| |
| if (conv(&lval, tbl_data, 1, data)) { |
| err = -EINVAL; |
| goto out_free; |
| } |
| |
| if (!err && left) |
| left -= proc_skip_spaces(&p); |
| |
| out_free: |
| kfree(kbuf); |
| if (err) |
| return -EINVAL; |
| |
| return 0; |
| |
| /* This is in keeping with old __do_proc_dointvec() */ |
| bail_early: |
| *ppos += *lenp; |
| return err; |
| } |
| |
| static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| unsigned long lval; |
| int err = 0; |
| size_t left; |
| |
| left = *lenp; |
| |
| if (conv(&lval, tbl_data, 0, data)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| err = proc_put_long(&buffer, &left, lval, false); |
| if (err || !left) |
| goto out; |
| |
| err = proc_put_char(&buffer, &left, '\n'); |
| |
| out: |
| *lenp -= left; |
| *ppos += *lenp; |
| |
| return err; |
| } |
| |
| static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, |
| int write, void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| unsigned int *i, vleft; |
| |
| if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| i = (unsigned int *) tbl_data; |
| vleft = table->maxlen / sizeof(*i); |
| |
| /* |
| * Arrays are not supported, keep this simple. *Do not* add |
| * support for them. |
| */ |
| if (vleft != 1) { |
| *lenp = 0; |
| return -EINVAL; |
| } |
| |
| if (!conv) |
| conv = do_proc_douintvec_conv; |
| |
| if (write) |
| return do_proc_douintvec_w(i, table, buffer, lenp, ppos, |
| conv, data); |
| return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); |
| } |
| |
| static int do_proc_douintvec(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos, |
| int (*conv)(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data), |
| void *data) |
| { |
| return __do_proc_douintvec(table->data, table, write, |
| buffer, lenp, ppos, conv, data); |
| } |
| |
| /** |
| * proc_dointvec - read a vector of integers |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); |
| } |
| |
| /** |
| * proc_douintvec - read a vector of unsigned integers |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_douintvec(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_douintvec(table, write, buffer, lenp, ppos, |
| do_proc_douintvec_conv, NULL); |
| } |
| |
| /* |
| * Taint values can only be increased |
| * This means we can safely use a temporary. |
| */ |
| static int proc_taint(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct ctl_table t; |
| unsigned long tmptaint = get_taint(); |
| int err; |
| |
| if (write && !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| t = *table; |
| t.data = &tmptaint; |
| err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
| if (err < 0) |
| return err; |
| |
| if (write) { |
| /* |
| * Poor man's atomic or. Not worth adding a primitive |
| * to everyone's atomic.h for this |
| */ |
| int i; |
| for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { |
| if ((tmptaint >> i) & 1) |
| add_taint(i, LOCKDEP_STILL_OK); |
| } |
| } |
| |
| return err; |
| } |
| |
| #ifdef CONFIG_PRINTK |
| static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| if (write && !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| return proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
| } |
| #endif |
| |
| struct do_proc_dointvec_minmax_conv_param { |
| int *min; |
| int *max; |
| }; |
| |
| static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| struct do_proc_dointvec_minmax_conv_param *param = data; |
| if (write) { |
| int val = *negp ? -*lvalp : *lvalp; |
| if ((param->min && *param->min > val) || |
| (param->max && *param->max < val)) |
| return -EINVAL; |
| *valp = val; |
| } else { |
| int val = *valp; |
| if (val < 0) { |
| *negp = true; |
| *lvalp = -(unsigned long)val; |
| } else { |
| *negp = false; |
| *lvalp = (unsigned long)val; |
| } |
| } |
| return 0; |
| } |
| |
| /** |
| * proc_dointvec_minmax - read a vector of integers with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec_minmax(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct do_proc_dointvec_minmax_conv_param param = { |
| .min = (int *) table->extra1, |
| .max = (int *) table->extra2, |
| }; |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, |
| do_proc_dointvec_minmax_conv, ¶m); |
| } |
| |
| struct do_proc_douintvec_minmax_conv_param { |
| unsigned int *min; |
| unsigned int *max; |
| }; |
| |
| static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data) |
| { |
| struct do_proc_douintvec_minmax_conv_param *param = data; |
| |
| if (write) { |
| unsigned int val = *lvalp; |
| |
| if (*lvalp > UINT_MAX) |
| return -EINVAL; |
| |
| if ((param->min && *param->min > val) || |
| (param->max && *param->max < val)) |
| return -ERANGE; |
| |
| *valp = val; |
| } else { |
| unsigned int val = *valp; |
| *lvalp = (unsigned long) val; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * proc_douintvec_minmax - read a vector of unsigned ints with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer |
| * values from/to the user buffer, treated as an ASCII string. Negative |
| * strings are not allowed. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). There is a final sanity |
| * check for UINT_MAX to avoid having to support wrap around uses from |
| * userspace. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_douintvec_minmax(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct do_proc_douintvec_minmax_conv_param param = { |
| .min = (unsigned int *) table->extra1, |
| .max = (unsigned int *) table->extra2, |
| }; |
| return do_proc_douintvec(table, write, buffer, lenp, ppos, |
| do_proc_douintvec_minmax_conv, ¶m); |
| } |
| |
| struct do_proc_dopipe_max_size_conv_param { |
| unsigned int *min; |
| }; |
| |
| static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, |
| unsigned int *valp, |
| int write, void *data) |
| { |
| struct do_proc_dopipe_max_size_conv_param *param = data; |
| |
| if (write) { |
| unsigned int val; |
| |
| if (*lvalp > UINT_MAX) |
| return -EINVAL; |
| |
| val = round_pipe_size(*lvalp); |
| if (val == 0) |
| return -EINVAL; |
| |
| if (param->min && *param->min > val) |
| return -ERANGE; |
| |
| *valp = val; |
| } else { |
| unsigned int val = *valp; |
| *lvalp = (unsigned long) val; |
| } |
| |
| return 0; |
| } |
| |
| int proc_dopipe_max_size(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct do_proc_dopipe_max_size_conv_param param = { |
| .min = (unsigned int *) table->extra1, |
| }; |
| return do_proc_douintvec(table, write, buffer, lenp, ppos, |
| do_proc_dopipe_max_size_conv, ¶m); |
| } |
| |
| static void validate_coredump_safety(void) |
| { |
| #ifdef CONFIG_COREDUMP |
| if (suid_dumpable == SUID_DUMP_ROOT && |
| core_pattern[0] != '/' && core_pattern[0] != '|') { |
| printk(KERN_WARNING |
| "Unsafe core_pattern used with fs.suid_dumpable=2.\n" |
| "Pipe handler or fully qualified core dump path required.\n" |
| "Set kernel.core_pattern before fs.suid_dumpable.\n" |
| ); |
| } |
| #endif |
| } |
| |
| static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
| if (!error) |
| validate_coredump_safety(); |
| return error; |
| } |
| |
| #ifdef CONFIG_COREDUMP |
| static int proc_dostring_coredump(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int error = proc_dostring(table, write, buffer, lenp, ppos); |
| if (!error) |
| validate_coredump_safety(); |
| return error; |
| } |
| #endif |
| |
| static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| unsigned long convmul, |
| unsigned long convdiv) |
| { |
| unsigned long *i, *min, *max; |
| int vleft, first = 1, err = 0; |
| size_t left; |
| char *kbuf = NULL, *p; |
| |
| if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| i = (unsigned long *) data; |
| min = (unsigned long *) table->extra1; |
| max = (unsigned long *) table->extra2; |
| vleft = table->maxlen / sizeof(unsigned long); |
| left = *lenp; |
| |
| if (write) { |
| if (proc_first_pos_non_zero_ignore(ppos, table)) |
| goto out; |
| |
| if (left > PAGE_SIZE - 1) |
| left = PAGE_SIZE - 1; |
| p = kbuf = memdup_user_nul(buffer, left); |
| if (IS_ERR(kbuf)) |
| return PTR_ERR(kbuf); |
| } |
| |
| for (; left && vleft--; i++, first = 0) { |
| unsigned long val; |
| |
| if (write) { |
| bool neg; |
| |
| left -= proc_skip_spaces(&p); |
| |
| err = proc_get_long(&p, &left, &val, &neg, |
| proc_wspace_sep, |
| sizeof(proc_wspace_sep), NULL); |
| if (err) |
| break; |
| if (neg) |
| continue; |
| val = convmul * val / convdiv; |
| if ((min && val < *min) || (max && val > *max)) |
| continue; |
| *i = val; |
| } else { |
| val = convdiv * (*i) / convmul; |
| if (!first) { |
| err = proc_put_char(&buffer, &left, '\t'); |
| if (err) |
| break; |
| } |
| err = proc_put_long(&buffer, &left, val, false); |
| if (err) |
| break; |
| } |
| } |
| |
| if (!write && !first && left && !err) |
| err = proc_put_char(&buffer, &left, '\n'); |
| if (write && !err) |
| left -= proc_skip_spaces(&p); |
| if (write) { |
| kfree(kbuf); |
| if (first) |
| return err ? : -EINVAL; |
| } |
| *lenp -= left; |
| out: |
| *ppos += *lenp; |
| return err; |
| } |
| |
| static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| unsigned long convmul, |
| unsigned long convdiv) |
| { |
| return __do_proc_doulongvec_minmax(table->data, table, write, |
| buffer, lenp, ppos, convmul, convdiv); |
| } |
| |
| /** |
| * proc_doulongvec_minmax - read a vector of long integers with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
| * values from/to the user buffer, treated as an ASCII string. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). |
| * |
| * Returns 0 on success. |
| */ |
| int proc_doulongvec_minmax(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
| } |
| |
| /** |
| * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long |
| * values from/to the user buffer, treated as an ASCII string. The values |
| * are treated as milliseconds, and converted to jiffies when they are stored. |
| * |
| * This routine will ensure the values are within the range specified by |
| * table->extra1 (min) and table->extra2 (max). |
| * |
| * Returns 0 on success. |
| */ |
| int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_doulongvec_minmax(table, write, buffer, |
| lenp, ppos, HZ, 1000l); |
| } |
| |
| |
| static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (*lvalp > INT_MAX / HZ) |
| return 1; |
| *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
| } else { |
| int val = *valp; |
| unsigned long lval; |
| if (val < 0) { |
| *negp = true; |
| lval = -(unsigned long)val; |
| } else { |
| *negp = false; |
| lval = (unsigned long)val; |
| } |
| *lvalp = lval / HZ; |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
| return 1; |
| *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
| } else { |
| int val = *valp; |
| unsigned long lval; |
| if (val < 0) { |
| *negp = true; |
| lval = -(unsigned long)val; |
| } else { |
| *negp = false; |
| lval = (unsigned long)val; |
| } |
| *lvalp = jiffies_to_clock_t(lval); |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
| |
| if (jif > INT_MAX) |
| return 1; |
| *valp = (int)jif; |
| } else { |
| int val = *valp; |
| unsigned long lval; |
| if (val < 0) { |
| *negp = true; |
| lval = -(unsigned long)val; |
| } else { |
| *negp = false; |
| lval = (unsigned long)val; |
| } |
| *lvalp = jiffies_to_msecs(lval); |
| } |
| return 0; |
| } |
| |
| /** |
| * proc_dointvec_jiffies - read a vector of integers as seconds |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * The values read are assumed to be in seconds, and are converted into |
| * jiffies. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec_jiffies(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table,write,buffer,lenp,ppos, |
| do_proc_dointvec_jiffies_conv,NULL); |
| } |
| |
| /** |
| * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: pointer to the file position |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * The values read are assumed to be in 1/USER_HZ seconds, and |
| * are converted into jiffies. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table,write,buffer,lenp,ppos, |
| do_proc_dointvec_userhz_jiffies_conv,NULL); |
| } |
| |
| /** |
| * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * @ppos: the current position in the file |
| * |
| * Reads/writes up to table->maxlen/sizeof(unsigned int) integer |
| * values from/to the user buffer, treated as an ASCII string. |
| * The values read are assumed to be in 1/1000 seconds, and |
| * are converted into jiffies. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table, write, buffer, lenp, ppos, |
| do_proc_dointvec_ms_jiffies_conv, NULL); |
| } |
| |
| static int proc_do_cad_pid(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| struct pid *new_pid; |
| pid_t tmp; |
| int r; |
| |
| tmp = pid_vnr(cad_pid); |
| |
| r = __do_proc_dointvec(&tmp, table, write, buffer, |
| lenp, ppos, NULL, NULL); |
| if (r || !write) |
| return r; |
| |
| new_pid = find_get_pid(tmp); |
| if (!new_pid) |
| return -ESRCH; |
| |
| put_pid(xchg(&cad_pid, new_pid)); |
| return 0; |
| } |
| |
| /** |
| * proc_do_large_bitmap - read/write from/to a large bitmap |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @buffer: the user buffer |
| * @lenp: the size of the user buffer |
| * @ppos: file position |
| * |
| * The bitmap is stored at table->data and the bitmap length (in bits) |
| * in table->maxlen. |
| * |
| * We use a range comma separated format (e.g. 1,3-4,10-10) so that |
| * large bitmaps may be represented in a compact manner. Writing into |
| * the file will clear the bitmap then update it with the given input. |
| * |
| * Returns 0 on success. |
| */ |
| int proc_do_large_bitmap(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int err = 0; |
| bool first = 1; |
| size_t left = *lenp; |
| unsigned long bitmap_len = table->maxlen; |
| unsigned long *bitmap = *(unsigned long **) table->data; |
| unsigned long *tmp_bitmap = NULL; |
| char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; |
| |
| if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { |
| *lenp = 0; |
| return 0; |
| } |
| |
| if (write) { |
| char *kbuf, *p; |
| |
| if (left > PAGE_SIZE - 1) |
| left = PAGE_SIZE - 1; |
| |
| p = kbuf = memdup_user_nul(buffer, left); |
| if (IS_ERR(kbuf)) |
| return PTR_ERR(kbuf); |
| |
| tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), |
| GFP_KERNEL); |
| if (!tmp_bitmap) { |
| kfree(kbuf); |
| return -ENOMEM; |
| } |
| proc_skip_char(&p, &left, '\n'); |
| while (!err && left) { |
| unsigned long val_a, val_b; |
| bool neg; |
| |
| err = proc_get_long(&p, &left, &val_a, &neg, tr_a, |
| sizeof(tr_a), &c); |
| if (err) |
| break; |
| if (val_a >= bitmap_len || neg) { |
| err = -EINVAL; |
| break; |
| } |
| |
| val_b = val_a; |
| if (left) { |
| p++; |
| left--; |
| } |
| |
| if (c == '-') { |
| err = proc_get_long(&p, &left, &val_b, |
| &neg, tr_b, sizeof(tr_b), |
| &c); |
| if (err) |
| break; |
| if (val_b >= bitmap_len || neg || |
| val_a > val_b) { |
| err = -EINVAL; |
| break; |
| } |
| if (left) { |
| p++; |
| left--; |
| } |
| } |
| |
| bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); |
| first = 0; |
| proc_skip_char(&p, &left, '\n'); |
| } |
| kfree(kbuf); |
| } else { |
| unsigned long bit_a, bit_b = 0; |
| |
| while (left) { |
| bit_a = find_next_bit(bitmap, bitmap_len, bit_b); |
| if (bit_a >= bitmap_len) |
| break; |
| bit_b = find_next_zero_bit(bitmap, bitmap_len, |
| bit_a + 1) - 1; |
| |
| if (!first) { |
| err = proc_put_char(&buffer, &left, ','); |
| if (err) |
| break; |
| } |
| err = proc_put_long(&buffer, &left, bit_a, false); |
| if (err) |
| break; |
| if (bit_a != bit_b) { |
| err = proc_put_char(&buffer, &left, '-'); |
| if (err) |
| break; |
| err = proc_put_long(&buffer, &left, bit_b, false); |
| if (err) |
| break; |
| } |
| |
| first = 0; bit_b++; |
| } |
| if (!err) |
| err = proc_put_char(&buffer, &left, '\n'); |
| } |
| |
| if (!err) { |
| if (write) { |
| if (*ppos) |
| bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); |
| else |
| bitmap_copy(bitmap, tmp_bitmap, bitmap_len); |
| } |
| *lenp -= left; |
| *ppos += *lenp; |
| } |
| |
| kfree(tmp_bitmap); |
| return err; |
| } |
| |
| #else /* CONFIG_PROC_SYSCTL */ |
| |
| int proc_dostring(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_douintvec(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_minmax(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_douintvec_minmax(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dopipe_max_size(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_jiffies(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_doulongvec_minmax(struct ctl_table *table, int write, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| |
| #endif /* CONFIG_PROC_SYSCTL */ |
| |
| /* |
| * No sense putting this after each symbol definition, twice, |
| * exception granted :-) |
| */ |
| EXPORT_SYMBOL(proc_dointvec); |
| EXPORT_SYMBOL(proc_douintvec); |
| EXPORT_SYMBOL(proc_dointvec_jiffies); |
| EXPORT_SYMBOL(proc_dointvec_minmax); |
| EXPORT_SYMBOL_GPL(proc_douintvec_minmax); |
| EXPORT_SYMBOL_GPL(proc_dopipe_max_size); |
| EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
| EXPORT_SYMBOL(proc_dointvec_ms_jiffies); |
| EXPORT_SYMBOL(proc_dostring); |
| EXPORT_SYMBOL(proc_doulongvec_minmax); |
| EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); |
