| /* |
| * 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/mm.h> |
| #include <linux/swap.h> |
| #include <linux/slab.h> |
| #include <linux/sysctl.h> |
| #include <linux/proc_fs.h> |
| #include <linux/security.h> |
| #include <linux/ctype.h> |
| #include <linux/utsname.h> |
| #include <linux/smp_lock.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/hugetlb.h> |
| #include <linux/initrd.h> |
| #include <linux/key.h> |
| #include <linux/times.h> |
| #include <linux/limits.h> |
| #include <linux/dcache.h> |
| #include <linux/syscalls.h> |
| #include <linux/nfs_fs.h> |
| #include <linux/acpi.h> |
| #include <linux/reboot.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/processor.h> |
| |
| #ifdef CONFIG_X86 |
| #include <asm/nmi.h> |
| #include <asm/stacktrace.h> |
| #include <asm/io.h> |
| #endif |
| |
| static int deprecated_sysctl_warning(struct __sysctl_args *args); |
| |
| #if defined(CONFIG_SYSCTL) |
| |
| /* External variables not in a header file. */ |
| extern int C_A_D; |
| extern int print_fatal_signals; |
| extern int sysctl_overcommit_memory; |
| extern int sysctl_overcommit_ratio; |
| extern int sysctl_panic_on_oom; |
| extern int sysctl_oom_kill_allocating_task; |
| extern int sysctl_oom_dump_tasks; |
| extern int max_threads; |
| extern int core_uses_pid; |
| extern int suid_dumpable; |
| extern char core_pattern[]; |
| extern int pid_max; |
| extern int min_free_kbytes; |
| extern int pid_max_min, pid_max_max; |
| extern int sysctl_drop_caches; |
| extern int percpu_pagelist_fraction; |
| extern int compat_log; |
| extern int maps_protect; |
| extern int sysctl_stat_interval; |
| extern int latencytop_enabled; |
| extern int sysctl_nr_open_min, sysctl_nr_open_max; |
| |
| /* Constants used for minimum and maximum */ |
| #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM) |
| static int one = 1; |
| #endif |
| |
| #ifdef CONFIG_DETECT_SOFTLOCKUP |
| static int sixty = 60; |
| #endif |
| |
| #ifdef CONFIG_MMU |
| static int two = 2; |
| #endif |
| |
| static int zero; |
| static int one_hundred = 100; |
| |
| /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
| static int maxolduid = 65535; |
| static int minolduid; |
| static int min_percpu_pagelist_fract = 8; |
| |
| static int ngroups_max = NGROUPS_MAX; |
| |
| #ifdef CONFIG_KMOD |
| extern char modprobe_path[]; |
| #endif |
| #ifdef CONFIG_CHR_DEV_SG |
| extern int sg_big_buff; |
| #endif |
| |
| #ifdef __sparc__ |
| extern char reboot_command []; |
| extern int stop_a_enabled; |
| extern int scons_pwroff; |
| #endif |
| |
| #ifdef __hppa__ |
| extern int pwrsw_enabled; |
| extern int unaligned_enabled; |
| #endif |
| |
| #ifdef CONFIG_S390 |
| #ifdef CONFIG_MATHEMU |
| extern int sysctl_ieee_emulation_warnings; |
| #endif |
| extern int sysctl_userprocess_debug; |
| extern int spin_retry; |
| #endif |
| |
| extern int sysctl_hz_timer; |
| |
| #ifdef CONFIG_BSD_PROCESS_ACCT |
| extern int acct_parm[]; |
| #endif |
| |
| #ifdef CONFIG_IA64 |
| extern int no_unaligned_warning; |
| #endif |
| |
| #ifdef CONFIG_RT_MUTEXES |
| extern int max_lock_depth; |
| #endif |
| |
| #ifdef CONFIG_PROC_SYSCTL |
| static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos); |
| #endif |
| |
| static struct ctl_table root_table[]; |
| static struct ctl_table_root sysctl_table_root; |
| static struct ctl_table_header root_table_header = { |
| .ctl_table = root_table, |
| .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list), |
| .root = &sysctl_table_root, |
| }; |
| static struct ctl_table_root sysctl_table_root = { |
| .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), |
| .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry), |
| }; |
| |
| 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_INOTIFY_USER |
| extern struct ctl_table inotify_table[]; |
| #endif |
| |
| #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| int sysctl_legacy_va_layout; |
| #endif |
| |
| extern int prove_locking; |
| extern int lock_stat; |
| |
| /* The default sysctl tables: */ |
| |
| static struct ctl_table root_table[] = { |
| { |
| .ctl_name = CTL_KERN, |
| .procname = "kernel", |
| .mode = 0555, |
| .child = kern_table, |
| }, |
| { |
| .ctl_name = CTL_VM, |
| .procname = "vm", |
| .mode = 0555, |
| .child = vm_table, |
| }, |
| { |
| .ctl_name = CTL_FS, |
| .procname = "fs", |
| .mode = 0555, |
| .child = fs_table, |
| }, |
| { |
| .ctl_name = CTL_DEBUG, |
| .procname = "debug", |
| .mode = 0555, |
| .child = debug_table, |
| }, |
| { |
| .ctl_name = CTL_DEV, |
| .procname = "dev", |
| .mode = 0555, |
| .child = dev_table, |
| }, |
| /* |
| * NOTE: do not add new entries to this table unless you have read |
| * Documentation/sysctl/ctl_unnumbered.txt |
| */ |
| { .ctl_name = 0 } |
| }; |
| |
| #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 */ |
| #endif |
| |
| static struct ctl_table kern_table[] = { |
| #ifdef CONFIG_SCHED_DEBUG |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_min_granularity_ns", |
| .data = &sysctl_sched_min_granularity, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &sched_nr_latency_handler, |
| .strategy = &sysctl_intvec, |
| .extra1 = &min_sched_granularity_ns, |
| .extra2 = &max_sched_granularity_ns, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_latency_ns", |
| .data = &sysctl_sched_latency, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &sched_nr_latency_handler, |
| .strategy = &sysctl_intvec, |
| .extra1 = &min_sched_granularity_ns, |
| .extra2 = &max_sched_granularity_ns, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_wakeup_granularity_ns", |
| .data = &sysctl_sched_wakeup_granularity, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &min_wakeup_granularity_ns, |
| .extra2 = &max_wakeup_granularity_ns, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_child_runs_first", |
| .data = &sysctl_sched_child_runs_first, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_features", |
| .data = &sysctl_sched_features, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_migration_cost", |
| .data = &sysctl_sched_migration_cost, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_nr_migrate", |
| .data = &sysctl_sched_nr_migrate, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_rt_period_us", |
| .data = &sysctl_sched_rt_period, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &sched_rt_handler, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_rt_runtime_us", |
| .data = &sysctl_sched_rt_runtime, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &sched_rt_handler, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "sched_compat_yield", |
| .data = &sysctl_sched_compat_yield, |
| .maxlen = sizeof(unsigned int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #ifdef CONFIG_PROVE_LOCKING |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "prove_locking", |
| .data = &prove_locking, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_LOCK_STAT |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "lock_stat", |
| .data = &lock_stat, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = KERN_PANIC, |
| .procname = "panic", |
| .data = &panic_timeout, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = KERN_CORE_USES_PID, |
| .procname = "core_uses_pid", |
| .data = &core_uses_pid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = KERN_CORE_PATTERN, |
| .procname = "core_pattern", |
| .data = core_pattern, |
| .maxlen = CORENAME_MAX_SIZE, |
| .mode = 0644, |
| .proc_handler = &proc_dostring, |
| .strategy = &sysctl_string, |
| }, |
| #ifdef CONFIG_PROC_SYSCTL |
| { |
| .procname = "tainted", |
| .data = &tainted, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_taint, |
| }, |
| #endif |
| #ifdef CONFIG_LATENCYTOP |
| { |
| .procname = "latencytop", |
| .data = &latencytop_enabled, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_BLK_DEV_INITRD |
| { |
| .ctl_name = KERN_REALROOTDEV, |
| .procname = "real-root-dev", |
| .data = &real_root_dev, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "print-fatal-signals", |
| .data = &print_fatal_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #ifdef __sparc__ |
| { |
| .ctl_name = KERN_SPARC_REBOOT, |
| .procname = "reboot-cmd", |
| .data = reboot_command, |
| .maxlen = 256, |
| .mode = 0644, |
| .proc_handler = &proc_dostring, |
| .strategy = &sysctl_string, |
| }, |
| { |
| .ctl_name = KERN_SPARC_STOP_A, |
| .procname = "stop-a", |
| .data = &stop_a_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = KERN_SPARC_SCONS_PWROFF, |
| .procname = "scons-poweroff", |
| .data = &scons_pwroff, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef __hppa__ |
| { |
| .ctl_name = KERN_HPPA_PWRSW, |
| .procname = "soft-power", |
| .data = &pwrsw_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = KERN_HPPA_UNALIGNED, |
| .procname = "unaligned-trap", |
| .data = &unaligned_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = KERN_CTLALTDEL, |
| .procname = "ctrl-alt-del", |
| .data = &C_A_D, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #ifdef CONFIG_KMOD |
| { |
| .ctl_name = KERN_MODPROBE, |
| .procname = "modprobe", |
| .data = &modprobe_path, |
| .maxlen = KMOD_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = &proc_dostring, |
| .strategy = &sysctl_string, |
| }, |
| #endif |
| #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
| { |
| .ctl_name = KERN_HOTPLUG, |
| .procname = "hotplug", |
| .data = &uevent_helper, |
| .maxlen = UEVENT_HELPER_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = &proc_dostring, |
| .strategy = &sysctl_string, |
| }, |
| #endif |
| #ifdef CONFIG_CHR_DEV_SG |
| { |
| .ctl_name = KERN_SG_BIG_BUFF, |
| .procname = "sg-big-buff", |
| .data = &sg_big_buff, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_BSD_PROCESS_ACCT |
| { |
| .ctl_name = KERN_ACCT, |
| .procname = "acct", |
| .data = &acct_parm, |
| .maxlen = 3*sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_MAGIC_SYSRQ |
| { |
| .ctl_name = KERN_SYSRQ, |
| .procname = "sysrq", |
| .data = &__sysrq_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_PROC_SYSCTL |
| { |
| .procname = "cad_pid", |
| .data = NULL, |
| .maxlen = sizeof (int), |
| .mode = 0600, |
| .proc_handler = &proc_do_cad_pid, |
| }, |
| #endif |
| { |
| .ctl_name = KERN_MAX_THREADS, |
| .procname = "threads-max", |
| .data = &max_threads, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = KERN_RANDOM, |
| .procname = "random", |
| .mode = 0555, |
| .child = random_table, |
| }, |
| { |
| .ctl_name = KERN_OVERFLOWUID, |
| .procname = "overflowuid", |
| .data = &overflowuid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| { |
| .ctl_name = KERN_OVERFLOWGID, |
| .procname = "overflowgid", |
| .data = &overflowgid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| #ifdef CONFIG_S390 |
| #ifdef CONFIG_MATHEMU |
| { |
| .ctl_name = KERN_IEEE_EMULATION_WARNINGS, |
| .procname = "ieee_emulation_warnings", |
| .data = &sysctl_ieee_emulation_warnings, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_NO_IDLE_HZ |
| { |
| .ctl_name = KERN_HZ_TIMER, |
| .procname = "hz_timer", |
| .data = &sysctl_hz_timer, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = KERN_S390_USER_DEBUG_LOGGING, |
| .procname = "userprocess_debug", |
| .data = &sysctl_userprocess_debug, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = KERN_PIDMAX, |
| .procname = "pid_max", |
| .data = &pid_max, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = sysctl_intvec, |
| .extra1 = &pid_max_min, |
| .extra2 = &pid_max_max, |
| }, |
| { |
| .ctl_name = KERN_PANIC_ON_OOPS, |
| .procname = "panic_on_oops", |
| .data = &panic_on_oops, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #if defined CONFIG_PRINTK |
| { |
| .ctl_name = KERN_PRINTK, |
| .procname = "printk", |
| .data = &console_loglevel, |
| .maxlen = 4*sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = KERN_PRINTK_RATELIMIT, |
| .procname = "printk_ratelimit", |
| .data = &printk_ratelimit_jiffies, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| .strategy = &sysctl_jiffies, |
| }, |
| { |
| .ctl_name = KERN_PRINTK_RATELIMIT_BURST, |
| .procname = "printk_ratelimit_burst", |
| .data = &printk_ratelimit_burst, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = KERN_NGROUPS_MAX, |
| .procname = "ngroups_max", |
| .data = &ngroups_max, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = &proc_dointvec, |
| }, |
| #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
| { |
| .ctl_name = KERN_UNKNOWN_NMI_PANIC, |
| .procname = "unknown_nmi_panic", |
| .data = &unknown_nmi_panic, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .procname = "nmi_watchdog", |
| .data = &nmi_watchdog_enabled, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_nmi_enabled, |
| }, |
| #endif |
| #if defined(CONFIG_X86) |
| { |
| .ctl_name = KERN_PANIC_ON_NMI, |
| .procname = "panic_on_unrecovered_nmi", |
| .data = &panic_on_unrecovered_nmi, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = KERN_BOOTLOADER_TYPE, |
| .procname = "bootloader_type", |
| .data = &bootloader_type, |
| .maxlen = sizeof (int), |
| .mode = 0444, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "kstack_depth_to_print", |
| .data = &kstack_depth_to_print, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "io_delay_type", |
| .data = &io_delay_type, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #if defined(CONFIG_MMU) |
| { |
| .ctl_name = KERN_RANDOMIZE, |
| .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) |
| { |
| .ctl_name = KERN_SPIN_RETRY, |
| .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_IA64 |
| { |
| .ctl_name = KERN_IA64_UNALIGNED, |
| .procname = "ignore-unaligned-usertrap", |
| .data = &no_unaligned_warning, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_DETECT_SOFTLOCKUP |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "softlockup_thresh", |
| .data = &softlockup_thresh, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &proc_doulongvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &one, |
| .extra2 = &sixty, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "hung_task_check_count", |
| .data = &sysctl_hung_task_check_count, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &proc_doulongvec_minmax, |
| .strategy = &sysctl_intvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "hung_task_timeout_secs", |
| .data = &sysctl_hung_task_timeout_secs, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &proc_doulongvec_minmax, |
| .strategy = &sysctl_intvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "hung_task_warnings", |
| .data = &sysctl_hung_task_warnings, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &proc_doulongvec_minmax, |
| .strategy = &sysctl_intvec, |
| }, |
| #endif |
| #ifdef CONFIG_COMPAT |
| { |
| .ctl_name = KERN_COMPAT_LOG, |
| .procname = "compat-log", |
| .data = &compat_log, |
| .maxlen = sizeof (int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_RT_MUTEXES |
| { |
| .ctl_name = KERN_MAX_LOCK_DEPTH, |
| .procname = "max_lock_depth", |
| .data = &max_lock_depth, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_PROC_FS |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "maps_protect", |
| .data = &maps_protect, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "poweroff_cmd", |
| .data = &poweroff_cmd, |
| .maxlen = POWEROFF_CMD_PATH_LEN, |
| .mode = 0644, |
| .proc_handler = &proc_dostring, |
| .strategy = &sysctl_string, |
| }, |
| #ifdef CONFIG_KEYS |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "keys", |
| .mode = 0555, |
| .child = key_sysctls, |
| }, |
| #endif |
| /* |
| * NOTE: do not add new entries to this table unless you have read |
| * Documentation/sysctl/ctl_unnumbered.txt |
| */ |
| { .ctl_name = 0 } |
| }; |
| |
| static struct ctl_table vm_table[] = { |
| { |
| .ctl_name = VM_OVERCOMMIT_MEMORY, |
| .procname = "overcommit_memory", |
| .data = &sysctl_overcommit_memory, |
| .maxlen = sizeof(sysctl_overcommit_memory), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = VM_PANIC_ON_OOM, |
| .procname = "panic_on_oom", |
| .data = &sysctl_panic_on_oom, |
| .maxlen = sizeof(sysctl_panic_on_oom), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "oom_kill_allocating_task", |
| .data = &sysctl_oom_kill_allocating_task, |
| .maxlen = sizeof(sysctl_oom_kill_allocating_task), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "oom_dump_tasks", |
| .data = &sysctl_oom_dump_tasks, |
| .maxlen = sizeof(sysctl_oom_dump_tasks), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = VM_OVERCOMMIT_RATIO, |
| .procname = "overcommit_ratio", |
| .data = &sysctl_overcommit_ratio, |
| .maxlen = sizeof(sysctl_overcommit_ratio), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = VM_PAGE_CLUSTER, |
| .procname = "page-cluster", |
| .data = &page_cluster, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = VM_DIRTY_BACKGROUND, |
| .procname = "dirty_background_ratio", |
| .data = &dirty_background_ratio, |
| .maxlen = sizeof(dirty_background_ratio), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| { |
| .ctl_name = VM_DIRTY_RATIO, |
| .procname = "dirty_ratio", |
| .data = &vm_dirty_ratio, |
| .maxlen = sizeof(vm_dirty_ratio), |
| .mode = 0644, |
| .proc_handler = &dirty_ratio_handler, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| { |
| .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_userhz_jiffies, |
| }, |
| { |
| .ctl_name = VM_NR_PDFLUSH_THREADS, |
| .procname = "nr_pdflush_threads", |
| .data = &nr_pdflush_threads, |
| .maxlen = sizeof nr_pdflush_threads, |
| .mode = 0444 /* read-only*/, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = VM_SWAPPINESS, |
| .procname = "swappiness", |
| .data = &vm_swappiness, |
| .maxlen = sizeof(vm_swappiness), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| #ifdef CONFIG_HUGETLB_PAGE |
| { |
| .procname = "nr_hugepages", |
| .data = &max_huge_pages, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &hugetlb_sysctl_handler, |
| .extra1 = (void *)&hugetlb_zero, |
| .extra2 = (void *)&hugetlb_infinity, |
| }, |
| { |
| .ctl_name = VM_HUGETLB_GROUP, |
| .procname = "hugetlb_shm_group", |
| .data = &sysctl_hugetlb_shm_group, |
| .maxlen = sizeof(gid_t), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "hugepages_treat_as_movable", |
| .data = &hugepages_treat_as_movable, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &hugetlb_treat_movable_handler, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "nr_overcommit_hugepages", |
| .data = &sysctl_overcommit_huge_pages, |
| .maxlen = sizeof(sysctl_overcommit_huge_pages), |
| .mode = 0644, |
| .proc_handler = &hugetlb_overcommit_handler, |
| }, |
| #endif |
| { |
| .ctl_name = VM_LOWMEM_RESERVE_RATIO, |
| .procname = "lowmem_reserve_ratio", |
| .data = &sysctl_lowmem_reserve_ratio, |
| .maxlen = sizeof(sysctl_lowmem_reserve_ratio), |
| .mode = 0644, |
| .proc_handler = &lowmem_reserve_ratio_sysctl_handler, |
| .strategy = &sysctl_intvec, |
| }, |
| { |
| .ctl_name = VM_DROP_PAGECACHE, |
| .procname = "drop_caches", |
| .data = &sysctl_drop_caches, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = drop_caches_sysctl_handler, |
| .strategy = &sysctl_intvec, |
| }, |
| { |
| .ctl_name = VM_MIN_FREE_KBYTES, |
| .procname = "min_free_kbytes", |
| .data = &min_free_kbytes, |
| .maxlen = sizeof(min_free_kbytes), |
| .mode = 0644, |
| .proc_handler = &min_free_kbytes_sysctl_handler, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| }, |
| { |
| .ctl_name = VM_PERCPU_PAGELIST_FRACTION, |
| .procname = "percpu_pagelist_fraction", |
| .data = &percpu_pagelist_fraction, |
| .maxlen = sizeof(percpu_pagelist_fraction), |
| .mode = 0644, |
| .proc_handler = &percpu_pagelist_fraction_sysctl_handler, |
| .strategy = &sysctl_intvec, |
| .extra1 = &min_percpu_pagelist_fract, |
| }, |
| #ifdef CONFIG_MMU |
| { |
| .ctl_name = VM_MAX_MAP_COUNT, |
| .procname = "max_map_count", |
| .data = &sysctl_max_map_count, |
| .maxlen = sizeof(sysctl_max_map_count), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec |
| }, |
| #endif |
| { |
| .ctl_name = VM_LAPTOP_MODE, |
| .procname = "laptop_mode", |
| .data = &laptop_mode, |
| .maxlen = sizeof(laptop_mode), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| .strategy = &sysctl_jiffies, |
| }, |
| { |
| .ctl_name = VM_BLOCK_DUMP, |
| .procname = "block_dump", |
| .data = &block_dump, |
| .maxlen = sizeof(block_dump), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| }, |
| { |
| .ctl_name = VM_VFS_CACHE_PRESSURE, |
| .procname = "vfs_cache_pressure", |
| .data = &sysctl_vfs_cache_pressure, |
| .maxlen = sizeof(sysctl_vfs_cache_pressure), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| }, |
| #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT |
| { |
| .ctl_name = VM_LEGACY_VA_LAYOUT, |
| .procname = "legacy_va_layout", |
| .data = &sysctl_legacy_va_layout, |
| .maxlen = sizeof(sysctl_legacy_va_layout), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| }, |
| #endif |
| #ifdef CONFIG_NUMA |
| { |
| .ctl_name = VM_ZONE_RECLAIM_MODE, |
| .procname = "zone_reclaim_mode", |
| .data = &zone_reclaim_mode, |
| .maxlen = sizeof(zone_reclaim_mode), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| }, |
| { |
| .ctl_name = VM_MIN_UNMAPPED, |
| .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, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| { |
| .ctl_name = VM_MIN_SLAB, |
| .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, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| .extra2 = &one_hundred, |
| }, |
| #endif |
| #ifdef CONFIG_SMP |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "stat_interval", |
| .data = &sysctl_stat_interval, |
| .maxlen = sizeof(sysctl_stat_interval), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| .strategy = &sysctl_jiffies, |
| }, |
| #endif |
| #ifdef CONFIG_SECURITY |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "mmap_min_addr", |
| .data = &mmap_min_addr, |
| .maxlen = sizeof(unsigned long), |
| .mode = 0644, |
| .proc_handler = &proc_doulongvec_minmax, |
| }, |
| #endif |
| #ifdef CONFIG_NUMA |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "numa_zonelist_order", |
| .data = &numa_zonelist_order, |
| .maxlen = NUMA_ZONELIST_ORDER_LEN, |
| .mode = 0644, |
| .proc_handler = &numa_zonelist_order_handler, |
| .strategy = &sysctl_string, |
| }, |
| #endif |
| #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ |
| (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) |
| { |
| .ctl_name = VM_VDSO_ENABLED, |
| .procname = "vdso_enabled", |
| .data = &vdso_enabled, |
| .maxlen = sizeof(vdso_enabled), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| }, |
| #endif |
| #ifdef CONFIG_HIGHMEM |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "highmem_is_dirtyable", |
| .data = &vm_highmem_is_dirtyable, |
| .maxlen = sizeof(vm_highmem_is_dirtyable), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| .extra2 = &one, |
| }, |
| #endif |
| /* |
| * NOTE: do not add new entries to this table unless you have read |
| * Documentation/sysctl/ctl_unnumbered.txt |
| */ |
| { .ctl_name = 0 } |
| }; |
| |
| #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
| static struct ctl_table binfmt_misc_table[] = { |
| { .ctl_name = 0 } |
| }; |
| #endif |
| |
| static struct ctl_table fs_table[] = { |
| { |
| .ctl_name = FS_NRINODE, |
| .procname = "inode-nr", |
| .data = &inodes_stat, |
| .maxlen = 2*sizeof(int), |
| .mode = 0444, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = FS_STATINODE, |
| .procname = "inode-state", |
| .data = &inodes_stat, |
| .maxlen = 7*sizeof(int), |
| .mode = 0444, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .procname = "file-nr", |
| .data = &files_stat, |
| .maxlen = 3*sizeof(int), |
| .mode = 0444, |
| .proc_handler = &proc_nr_files, |
| }, |
| { |
| .ctl_name = FS_MAXFILE, |
| .procname = "file-max", |
| .data = &files_stat.max_files, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "nr_open", |
| .data = &sysctl_nr_open, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .extra1 = &sysctl_nr_open_min, |
| .extra2 = &sysctl_nr_open_max, |
| }, |
| { |
| .ctl_name = FS_DENTRY, |
| .procname = "dentry-state", |
| .data = &dentry_stat, |
| .maxlen = 6*sizeof(int), |
| .mode = 0444, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .ctl_name = FS_OVERFLOWUID, |
| .procname = "overflowuid", |
| .data = &fs_overflowuid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| { |
| .ctl_name = FS_OVERFLOWGID, |
| .procname = "overflowgid", |
| .data = &fs_overflowgid, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &minolduid, |
| .extra2 = &maxolduid, |
| }, |
| { |
| .ctl_name = FS_LEASES, |
| .procname = "leases-enable", |
| .data = &leases_enable, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #ifdef CONFIG_DNOTIFY |
| { |
| .ctl_name = FS_DIR_NOTIFY, |
| .procname = "dir-notify-enable", |
| .data = &dir_notify_enable, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| #ifdef CONFIG_MMU |
| { |
| .ctl_name = FS_LEASE_TIME, |
| .procname = "lease-break-time", |
| .data = &lease_break_time, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_minmax, |
| .strategy = &sysctl_intvec, |
| .extra1 = &zero, |
| .extra2 = &two, |
| }, |
| { |
| .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, |
| }, |
| #ifdef CONFIG_INOTIFY_USER |
| { |
| .ctl_name = FS_INOTIFY, |
| .procname = "inotify", |
| .mode = 0555, |
| .child = inotify_table, |
| }, |
| #endif |
| #endif |
| { |
| .ctl_name = KERN_SETUID_DUMPABLE, |
| .procname = "suid_dumpable", |
| .data = &suid_dumpable, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "binfmt_misc", |
| .mode = 0555, |
| .child = binfmt_misc_table, |
| }, |
| #endif |
| /* |
| * NOTE: do not add new entries to this table unless you have read |
| * Documentation/sysctl/ctl_unnumbered.txt |
| */ |
| { .ctl_name = 0 } |
| }; |
| |
| static struct ctl_table debug_table[] = { |
| #if defined(CONFIG_X86) || defined(CONFIG_PPC) |
| { |
| .ctl_name = CTL_UNNUMBERED, |
| .procname = "exception-trace", |
| .data = &show_unhandled_signals, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec |
| }, |
| #endif |
| { .ctl_name = 0 } |
| }; |
| |
| static struct ctl_table dev_table[] = { |
| { .ctl_name = 0 } |
| }; |
| |
| static DEFINE_SPINLOCK(sysctl_lock); |
| |
| /* called under sysctl_lock */ |
| static int use_table(struct ctl_table_header *p) |
| { |
| if (unlikely(p->unregistering)) |
| return 0; |
| p->used++; |
| return 1; |
| } |
| |
| /* called under sysctl_lock */ |
| static void unuse_table(struct ctl_table_header *p) |
| { |
| if (!--p->used) |
| if (unlikely(p->unregistering)) |
| complete(p->unregistering); |
| } |
| |
| /* called under sysctl_lock, will reacquire if has to wait */ |
| static void start_unregistering(struct ctl_table_header *p) |
| { |
| /* |
| * if p->used is 0, nobody will ever touch that entry again; |
| * we'll eliminate all paths to it before dropping sysctl_lock |
| */ |
| if (unlikely(p->used)) { |
| struct completion wait; |
| init_completion(&wait); |
| p->unregistering = &wait; |
| spin_unlock(&sysctl_lock); |
| wait_for_completion(&wait); |
| spin_lock(&sysctl_lock); |
| } |
| /* |
| * do not remove from the list until nobody holds it; walking the |
| * list in do_sysctl() relies on that. |
| */ |
| list_del_init(&p->ctl_entry); |
| } |
| |
| void sysctl_head_finish(struct ctl_table_header *head) |
| { |
| if (!head) |
| return; |
| spin_lock(&sysctl_lock); |
| unuse_table(head); |
| spin_unlock(&sysctl_lock); |
| } |
| |
| static struct list_head * |
| lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) |
| { |
| struct list_head *header_list; |
| header_list = &root->header_list; |
| if (root->lookup) |
| header_list = root->lookup(root, namespaces); |
| return header_list; |
| } |
| |
| struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, |
| struct ctl_table_header *prev) |
| { |
| struct ctl_table_root *root; |
| struct list_head *header_list; |
| struct ctl_table_header *head; |
| struct list_head *tmp; |
| |
| spin_lock(&sysctl_lock); |
| if (prev) { |
| head = prev; |
| tmp = &prev->ctl_entry; |
| unuse_table(prev); |
| goto next; |
| } |
| tmp = &root_table_header.ctl_entry; |
| for (;;) { |
| head = list_entry(tmp, struct ctl_table_header, ctl_entry); |
| |
| if (!use_table(head)) |
| goto next; |
| spin_unlock(&sysctl_lock); |
| return head; |
| next: |
| root = head->root; |
| tmp = tmp->next; |
| header_list = lookup_header_list(root, namespaces); |
| if (tmp != header_list) |
| continue; |
| |
| do { |
| root = list_entry(root->root_list.next, |
| struct ctl_table_root, root_list); |
| if (root == &sysctl_table_root) |
| goto out; |
| header_list = lookup_header_list(root, namespaces); |
| } while (list_empty(header_list)); |
| tmp = header_list->next; |
| } |
| out: |
| spin_unlock(&sysctl_lock); |
| return NULL; |
| } |
| |
| struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) |
| { |
| return __sysctl_head_next(current->nsproxy, prev); |
| } |
| |
| void register_sysctl_root(struct ctl_table_root *root) |
| { |
| spin_lock(&sysctl_lock); |
| list_add_tail(&root->root_list, &sysctl_table_root.root_list); |
| spin_unlock(&sysctl_lock); |
| } |
| |
| #ifdef CONFIG_SYSCTL_SYSCALL |
| /* Perform the actual read/write of a sysctl table entry. */ |
| static int do_sysctl_strategy(struct ctl_table_root *root, |
| struct ctl_table *table, |
| int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| int op = 0, rc; |
| |
| if (oldval) |
| op |= 004; |
| if (newval) |
| op |= 002; |
| if (sysctl_perm(root, table, op)) |
| return -EPERM; |
| |
| if (table->strategy) { |
| rc = table->strategy(table, name, nlen, oldval, oldlenp, |
| newval, newlen); |
| if (rc < 0) |
| return rc; |
| if (rc > 0) |
| return 0; |
| } |
| |
| /* If there is no strategy routine, or if the strategy returns |
| * zero, proceed with automatic r/w */ |
| if (table->data && table->maxlen) { |
| rc = sysctl_data(table, name, nlen, oldval, oldlenp, |
| newval, newlen); |
| if (rc < 0) |
| return rc; |
| } |
| return 0; |
| } |
| |
| static int parse_table(int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen, |
| struct ctl_table_root *root, |
| struct ctl_table *table) |
| { |
| int n; |
| repeat: |
| if (!nlen) |
| return -ENOTDIR; |
| if (get_user(n, name)) |
| return -EFAULT; |
| for ( ; table->ctl_name || table->procname; table++) { |
| if (!table->ctl_name) |
| continue; |
| if (n == table->ctl_name) { |
| int error; |
| if (table->child) { |
| if (sysctl_perm(root, table, 001)) |
| return -EPERM; |
| name++; |
| nlen--; |
| table = table->child; |
| goto repeat; |
| } |
| error = do_sysctl_strategy(root, table, name, nlen, |
| oldval, oldlenp, |
| newval, newlen); |
| return error; |
| } |
| } |
| return -ENOTDIR; |
| } |
| |
| int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| struct ctl_table_header *head; |
| int error = -ENOTDIR; |
| |
| if (nlen <= 0 || nlen >= CTL_MAXNAME) |
| return -ENOTDIR; |
| if (oldval) { |
| int old_len; |
| if (!oldlenp || get_user(old_len, oldlenp)) |
| return -EFAULT; |
| } |
| |
| for (head = sysctl_head_next(NULL); head; |
| head = sysctl_head_next(head)) { |
| error = parse_table(name, nlen, oldval, oldlenp, |
| newval, newlen, |
| head->root, head->ctl_table); |
| if (error != -ENOTDIR) { |
| sysctl_head_finish(head); |
| break; |
| } |
| } |
| return error; |
| } |
| |
| asmlinkage long sys_sysctl(struct __sysctl_args __user *args) |
| { |
| struct __sysctl_args tmp; |
| int error; |
| |
| if (copy_from_user(&tmp, args, sizeof(tmp))) |
| return -EFAULT; |
| |
| error = deprecated_sysctl_warning(&tmp); |
| if (error) |
| goto out; |
| |
| lock_kernel(); |
| error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, |
| tmp.newval, tmp.newlen); |
| unlock_kernel(); |
| out: |
| return error; |
| } |
| #endif /* CONFIG_SYSCTL_SYSCALL */ |
| |
| /* |
| * sysctl_perm does NOT grant the superuser all rights automatically, because |
| * some sysctl variables are readonly even to root. |
| */ |
| |
| static int test_perm(int mode, int op) |
| { |
| if (!current->euid) |
| mode >>= 6; |
| else if (in_egroup_p(0)) |
| mode >>= 3; |
| if ((mode & op & 0007) == op) |
| return 0; |
| return -EACCES; |
| } |
| |
| int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) |
| { |
| int error; |
| int mode; |
| |
| error = security_sysctl(table, op); |
| if (error) |
| return error; |
| |
| if (root->permissions) |
| mode = root->permissions(root, current->nsproxy, table); |
| else |
| mode = table->mode; |
| |
| return test_perm(mode, op); |
| } |
| |
| static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) |
| { |
| for (; table->ctl_name || table->procname; table++) { |
| table->parent = parent; |
| if (table->child) |
| sysctl_set_parent(table, table->child); |
| } |
| } |
| |
| static __init int sysctl_init(void) |
| { |
| sysctl_set_parent(NULL, root_table); |
| #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
| { |
| int err; |
| err = sysctl_check_table(current->nsproxy, root_table); |
| } |
| #endif |
| return 0; |
| } |
| |
| core_initcall(sysctl_init); |
| |
| /** |
| * __register_sysctl_paths - register a sysctl hierarchy |
| * @root: List of sysctl headers to register on |
| * @namespaces: Data to compute which lists of sysctl entries are visible |
| * @path: The path to the directory the sysctl table is in. |
| * @table: the top-level table structure |
| * |
| * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
| * array. A completely 0 filled entry terminates the table. |
| * |
| * The members of the &struct ctl_table structure are used as follows: |
| * |
| * ctl_name - This is the numeric sysctl value used by sysctl(2). The number |
| * must be unique within that level of sysctl |
| * |
| * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not |
| * enter a sysctl file |
| * |
| * data - a pointer to data for use by proc_handler |
| * |
| * maxlen - the maximum size in bytes of the data |
| * |
| * mode - the file permissions for the /proc/sys file, and for sysctl(2) |
| * |
| * child - a pointer to the child sysctl table if this entry is a directory, or |
| * %NULL. |
| * |
| * proc_handler - the text handler routine (described below) |
| * |
| * strategy - the strategy routine (described below) |
| * |
| * de - for internal use by the sysctl routines |
| * |
| * extra1, extra2 - extra pointers usable by the proc handler routines |
| * |
| * Leaf nodes in the sysctl tree will be represented by a single file |
| * under /proc; non-leaf nodes will be represented by directories. |
| * |
| * sysctl(2) can automatically manage read and write requests through |
| * the sysctl table. The data and maxlen fields of the ctl_table |
| * struct enable minimal validation of the values being written to be |
| * performed, and the mode field allows minimal authentication. |
| * |
| * More sophisticated management can be enabled by the provision of a |
| * strategy routine with the table entry. This will be called before |
| * any automatic read or write of the data is performed. |
| * |
| * The strategy routine may return |
| * |
| * < 0 - Error occurred (error is passed to user process) |
| * |
| * 0 - OK - proceed with automatic read or write. |
| * |
| * > 0 - OK - read or write has been done by the strategy routine, so |
| * return immediately. |
| * |
| * There must be a proc_handler routine for any terminal nodes |
| * mirrored under /proc/sys (non-terminals are handled by a built-in |
| * directory handler). Several default handlers are available to |
| * cover common cases - |
| * |
| * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), |
| * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), |
| * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() |
| * |
| * It is the handler's job to read the input buffer from user memory |
| * and process it. The handler should return 0 on success. |
| * |
| * This routine returns %NULL on a failure to register, and a pointer |
| * to the table header on success. |
| */ |
| struct ctl_table_header *__register_sysctl_paths( |
| struct ctl_table_root *root, |
| struct nsproxy *namespaces, |
| const struct ctl_path *path, struct ctl_table *table) |
| { |
| struct list_head *header_list; |
| struct ctl_table_header *header; |
| struct ctl_table *new, **prevp; |
| unsigned int n, npath; |
| |
| /* Count the path components */ |
| for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) |
| ; |
| |
| /* |
| * For each path component, allocate a 2-element ctl_table array. |
| * The first array element will be filled with the sysctl entry |
| * for this, the second will be the sentinel (ctl_name == 0). |
| * |
| * We allocate everything in one go so that we don't have to |
| * worry about freeing additional memory in unregister_sysctl_table. |
| */ |
| header = kzalloc(sizeof(struct ctl_table_header) + |
| (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); |
| if (!header) |
| return NULL; |
| |
| new = (struct ctl_table *) (header + 1); |
| |
| /* Now connect the dots */ |
| prevp = &header->ctl_table; |
| for (n = 0; n < npath; ++n, ++path) { |
| /* Copy the procname */ |
| new->procname = path->procname; |
| new->ctl_name = path->ctl_name; |
| new->mode = 0555; |
| |
| *prevp = new; |
| prevp = &new->child; |
| |
| new += 2; |
| } |
| *prevp = table; |
| header->ctl_table_arg = table; |
| |
| INIT_LIST_HEAD(&header->ctl_entry); |
| header->used = 0; |
| header->unregistering = NULL; |
| header->root = root; |
| sysctl_set_parent(NULL, header->ctl_table); |
| #ifdef CONFIG_SYSCTL_SYSCALL_CHECK |
| if (sysctl_check_table(namespaces, header->ctl_table)) { |
| kfree(header); |
| return NULL; |
| } |
| #endif |
| spin_lock(&sysctl_lock); |
| header_list = lookup_header_list(root, namespaces); |
| list_add_tail(&header->ctl_entry, header_list); |
| spin_unlock(&sysctl_lock); |
| |
| return header; |
| } |
| |
| /** |
| * register_sysctl_table_path - register a sysctl table hierarchy |
| * @path: The path to the directory the sysctl table is in. |
| * @table: the top-level table structure |
| * |
| * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
| * array. A completely 0 filled entry terminates the table. |
| * |
| * See __register_sysctl_paths for more details. |
| */ |
| struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
| struct ctl_table *table) |
| { |
| return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, |
| path, table); |
| } |
| |
| /** |
| * register_sysctl_table - register a sysctl table hierarchy |
| * @table: the top-level table structure |
| * |
| * Register a sysctl table hierarchy. @table should be a filled in ctl_table |
| * array. A completely 0 filled entry terminates the table. |
| * |
| * See register_sysctl_paths for more details. |
| */ |
| struct ctl_table_header *register_sysctl_table(struct ctl_table *table) |
| { |
| static const struct ctl_path null_path[] = { {} }; |
| |
| return register_sysctl_paths(null_path, table); |
| } |
| |
| /** |
| * unregister_sysctl_table - unregister a sysctl table hierarchy |
| * @header: the header returned from register_sysctl_table |
| * |
| * Unregisters the sysctl table and all children. proc entries may not |
| * actually be removed until they are no longer used by anyone. |
| */ |
| void unregister_sysctl_table(struct ctl_table_header * header) |
| { |
| might_sleep(); |
| |
| if (header == NULL) |
| return; |
| |
| spin_lock(&sysctl_lock); |
| start_unregistering(header); |
| spin_unlock(&sysctl_lock); |
| kfree(header); |
| } |
| |
| #else /* !CONFIG_SYSCTL */ |
| struct ctl_table_header *register_sysctl_table(struct ctl_table * table) |
| { |
| return NULL; |
| } |
| |
| struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, |
| struct ctl_table *table) |
| { |
| return NULL; |
| } |
| |
| void unregister_sysctl_table(struct ctl_table_header * table) |
| { |
| } |
| |
| #endif /* CONFIG_SYSCTL */ |
| |
| /* |
| * /proc/sys support |
| */ |
| |
| #ifdef CONFIG_PROC_SYSCTL |
| |
| static int _proc_do_string(void* data, int maxlen, int write, |
| struct file *filp, void __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) { |
| len = 0; |
| p = buffer; |
| while (len < *lenp) { |
| if (get_user(c, p++)) |
| return -EFAULT; |
| if (c == 0 || c == '\n') |
| break; |
| len++; |
| } |
| if (len >= maxlen) |
| len = maxlen-1; |
| if(copy_from_user(data, buffer, len)) |
| return -EFAULT; |
| ((char *) data)[len] = 0; |
| *ppos += *lenp; |
| } 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', ((char __user *) buffer) + len)) |
| return -EFAULT; |
| len++; |
| } |
| *lenp = len; |
| *ppos += len; |
| } |
| return 0; |
| } |
| |
| /** |
| * proc_dostring - read a string sysctl |
| * @table: the sysctl table |
| * @write: %TRUE if this is a write to the sysctl file |
| * @filp: the file structure |
| * @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, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return _proc_do_string(table->data, table->maxlen, write, filp, |
| buffer, lenp, ppos); |
| } |
| |
| |
| static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| *valp = *negp ? -*lvalp : *lvalp; |
| } else { |
| int val = *valp; |
| if (val < 0) { |
| *negp = -1; |
| *lvalp = (unsigned long)-val; |
| } else { |
| *negp = 0; |
| *lvalp = (unsigned long)val; |
| } |
| } |
| return 0; |
| } |
| |
| static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
| int write, struct file *filp, void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
| int write, void *data), |
| void *data) |
| { |
| #define TMPBUFLEN 21 |
| int *i, vleft, first=1, neg, val; |
| unsigned long lval; |
| size_t left, len; |
| |
| char buf[TMPBUFLEN], *p; |
| char __user *s = buffer; |
| |
| 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; |
| |
| for (; left && vleft--; i++, first=0) { |
| if (write) { |
| while (left) { |
| char c; |
| if (get_user(c, s)) |
| return -EFAULT; |
| if (!isspace(c)) |
| break; |
| left--; |
| s++; |
| } |
| if (!left) |
| break; |
| neg = 0; |
| len = left; |
| if (len > sizeof(buf) - 1) |
| len = sizeof(buf) - 1; |
| if (copy_from_user(buf, s, len)) |
| return -EFAULT; |
| buf[len] = 0; |
| p = buf; |
| if (*p == '-' && left > 1) { |
| neg = 1; |
| p++; |
| } |
| if (*p < '0' || *p > '9') |
| break; |
| |
| lval = simple_strtoul(p, &p, 0); |
| |
| len = p-buf; |
| if ((len < left) && *p && !isspace(*p)) |
| break; |
| if (neg) |
| val = -val; |
| s += len; |
| left -= len; |
| |
| if (conv(&neg, &lval, i, 1, data)) |
| break; |
| } else { |
| p = buf; |
| if (!first) |
| *p++ = '\t'; |
| |
| if (conv(&neg, &lval, i, 0, data)) |
| break; |
| |
| sprintf(p, "%s%lu", neg ? "-" : "", lval); |
| len = strlen(buf); |
| if (len > left) |
| len = left; |
| if(copy_to_user(s, buf, len)) |
| return -EFAULT; |
| left -= len; |
| s += len; |
| } |
| } |
| |
| if (!write && !first && left) { |
| if(put_user('\n', s)) |
| return -EFAULT; |
| left--, s++; |
| } |
| if (write) { |
| while (left) { |
| char c; |
| if (get_user(c, s++)) |
| return -EFAULT; |
| if (!isspace(c)) |
| break; |
| left--; |
| } |
| } |
| if (write && first) |
| return -EINVAL; |
| *lenp -= left; |
| *ppos += *lenp; |
| return 0; |
| #undef TMPBUFLEN |
| } |
| |
| static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos, |
| int (*conv)(int *negp, unsigned long *lvalp, int *valp, |
| int write, void *data), |
| void *data) |
| { |
| return __do_proc_dointvec(table->data, table, write, filp, |
| 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 |
| * @filp: the file structure |
| * @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, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
| NULL,NULL); |
| } |
| |
| #define OP_SET 0 |
| #define OP_AND 1 |
| #define OP_OR 2 |
| |
| static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| int op = *(int *)data; |
| if (write) { |
| int val = *negp ? -*lvalp : *lvalp; |
| switch(op) { |
| case OP_SET: *valp = val; break; |
| case OP_AND: *valp &= val; break; |
| case OP_OR: *valp |= val; break; |
| } |
| } else { |
| int val = *valp; |
| if (val < 0) { |
| *negp = -1; |
| *lvalp = (unsigned long)-val; |
| } else { |
| *negp = 0; |
| *lvalp = (unsigned long)val; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * Taint values can only be increased |
| */ |
| static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| int op; |
| |
| if (write && !capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| op = OP_OR; |
| return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, |
| do_proc_dointvec_bset_conv,&op); |
| } |
| |
| struct do_proc_dointvec_minmax_conv_param { |
| int *min; |
| int *max; |
| }; |
| |
| static int do_proc_dointvec_minmax_conv(int *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 = -1; |
| *lvalp = (unsigned long)-val; |
| } else { |
| *negp = 0; |
| *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 |
| * @filp: the file structure |
| * @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, struct file *filp, |
| 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, filp, buffer, lenp, ppos, |
| do_proc_dointvec_minmax_conv, ¶m); |
| } |
| |
| static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, |
| struct file *filp, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| unsigned long convmul, |
| unsigned long convdiv) |
| { |
| #define TMPBUFLEN 21 |
| unsigned long *i, *min, *max, val; |
| int vleft, first=1, neg; |
| size_t len, left; |
| char buf[TMPBUFLEN], *p; |
| char __user *s = buffer; |
| |
| 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; |
| |
| for (; left && vleft--; i++, min++, max++, first=0) { |
| if (write) { |
| while (left) { |
| char c; |
| if (get_user(c, s)) |
| return -EFAULT; |
| if (!isspace(c)) |
| break; |
| left--; |
| s++; |
| } |
| if (!left) |
| break; |
| neg = 0; |
| len = left; |
| if (len > TMPBUFLEN-1) |
| len = TMPBUFLEN-1; |
| if (copy_from_user(buf, s, len)) |
| return -EFAULT; |
| buf[len] = 0; |
| p = buf; |
| if (*p == '-' && left > 1) { |
| neg = 1; |
| p++; |
| } |
| if (*p < '0' || *p > '9') |
| break; |
| val = simple_strtoul(p, &p, 0) * convmul / convdiv ; |
| len = p-buf; |
| if ((len < left) && *p && !isspace(*p)) |
| break; |
| if (neg) |
| val = -val; |
| s += len; |
| left -= len; |
| |
| if(neg) |
| continue; |
| if ((min && val < *min) || (max && val > *max)) |
| continue; |
| *i = val; |
| } else { |
| p = buf; |
| if (!first) |
| *p++ = '\t'; |
| sprintf(p, "%lu", convdiv * (*i) / convmul); |
| len = strlen(buf); |
| if (len > left) |
| len = left; |
| if(copy_to_user(s, buf, len)) |
| return -EFAULT; |
| left -= len; |
| s += len; |
| } |
| } |
| |
| if (!write && !first && left) { |
| if(put_user('\n', s)) |
| return -EFAULT; |
| left--, s++; |
| } |
| if (write) { |
| while (left) { |
| char c; |
| if (get_user(c, s++)) |
| return -EFAULT; |
| if (!isspace(c)) |
| break; |
| left--; |
| } |
| } |
| if (write && first) |
| return -EINVAL; |
| *lenp -= left; |
| *ppos += *lenp; |
| return 0; |
| #undef TMPBUFLEN |
| } |
| |
| static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
| struct file *filp, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos, |
| unsigned long convmul, |
| unsigned long convdiv) |
| { |
| return __do_proc_doulongvec_minmax(table->data, table, write, |
| filp, 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 |
| * @filp: the file structure |
| * @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, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_doulongvec_minmax(table, write, filp, 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 |
| * @filp: the file structure |
| * @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, |
| struct file *filp, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_doulongvec_minmax(table, write, filp, buffer, |
| lenp, ppos, HZ, 1000l); |
| } |
| |
| |
| static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| if (*lvalp > LONG_MAX / HZ) |
| return 1; |
| *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
| } else { |
| int val = *valp; |
| unsigned long lval; |
| if (val < 0) { |
| *negp = -1; |
| lval = (unsigned long)-val; |
| } else { |
| *negp = 0; |
| lval = (unsigned long)val; |
| } |
| *lvalp = lval / HZ; |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_userhz_jiffies_conv(int *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 = -1; |
| lval = (unsigned long)-val; |
| } else { |
| *negp = 0; |
| lval = (unsigned long)val; |
| } |
| *lvalp = jiffies_to_clock_t(lval); |
| } |
| return 0; |
| } |
| |
| static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, |
| int *valp, |
| int write, void *data) |
| { |
| if (write) { |
| *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
| } else { |
| int val = *valp; |
| unsigned long lval; |
| if (val < 0) { |
| *negp = -1; |
| lval = (unsigned long)-val; |
| } else { |
| *negp = 0; |
| 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 |
| * @filp: the file structure |
| * @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, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table,write,filp,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 |
| * @filp: the file structure |
| * @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, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table,write,filp,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 |
| * @filp: the file structure |
| * @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, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, |
| do_proc_dointvec_ms_jiffies_conv, NULL); |
| } |
| |
| static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, |
| 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, filp, 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; |
| } |
| |
| #else /* CONFIG_PROC_FS */ |
| |
| int proc_dostring(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, |
| void __user *buffer, size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
| struct file *filp, |
| void __user *buffer, |
| size_t *lenp, loff_t *ppos) |
| { |
| return -ENOSYS; |
| } |
| |
| |
| #endif /* CONFIG_PROC_FS */ |
| |
| |
| #ifdef CONFIG_SYSCTL_SYSCALL |
| /* |
| * General sysctl support routines |
| */ |
| |
| /* The generic sysctl data routine (used if no strategy routine supplied) */ |
| int sysctl_data(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| size_t len; |
| |
| /* Get out of I don't have a variable */ |
| if (!table->data || !table->maxlen) |
| return -ENOTDIR; |
| |
| if (oldval && oldlenp) { |
| if (get_user(len, oldlenp)) |
| return -EFAULT; |
| if (len) { |
| if (len > table->maxlen) |
| len = table->maxlen; |
| if (copy_to_user(oldval, table->data, len)) |
| return -EFAULT; |
| if (put_user(len, oldlenp)) |
| return -EFAULT; |
| } |
| } |
| |
| if (newval && newlen) { |
| if (newlen > table->maxlen) |
| newlen = table->maxlen; |
| |
| if (copy_from_user(table->data, newval, newlen)) |
| return -EFAULT; |
| } |
| return 1; |
| } |
| |
| /* The generic string strategy routine: */ |
| int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| if (!table->data || !table->maxlen) |
| return -ENOTDIR; |
| |
| if (oldval && oldlenp) { |
| size_t bufsize; |
| if (get_user(bufsize, oldlenp)) |
| return -EFAULT; |
| if (bufsize) { |
| size_t len = strlen(table->data), copied; |
| |
| /* This shouldn't trigger for a well-formed sysctl */ |
| if (len > table->maxlen) |
| len = table->maxlen; |
| |
| /* Copy up to a max of bufsize-1 bytes of the string */ |
| copied = (len >= bufsize) ? bufsize - 1 : len; |
| |
| if (copy_to_user(oldval, table->data, copied) || |
| put_user(0, (char __user *)(oldval + copied))) |
| return -EFAULT; |
| if (put_user(len, oldlenp)) |
| return -EFAULT; |
| } |
| } |
| if (newval && newlen) { |
| size_t len = newlen; |
| if (len > table->maxlen) |
| len = table->maxlen; |
| if(copy_from_user(table->data, newval, len)) |
| return -EFAULT; |
| if (len == table->maxlen) |
| len--; |
| ((char *) table->data)[len] = 0; |
| } |
| return 1; |
| } |
| |
| /* |
| * This function makes sure that all of the integers in the vector |
| * are between the minimum and maximum values given in the arrays |
| * table->extra1 and table->extra2, respectively. |
| */ |
| int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| |
| if (newval && newlen) { |
| int __user *vec = (int __user *) newval; |
| int *min = (int *) table->extra1; |
| int *max = (int *) table->extra2; |
| size_t length; |
| int i; |
| |
| if (newlen % sizeof(int) != 0) |
| return -EINVAL; |
| |
| if (!table->extra1 && !table->extra2) |
| return 0; |
| |
| if (newlen > table->maxlen) |
| newlen = table->maxlen; |
| length = newlen / sizeof(int); |
| |
| for (i = 0; i < length; i++) { |
| int value; |
| if (get_user(value, vec + i)) |
| return -EFAULT; |
| if (min && value < min[i]) |
| return -EINVAL; |
| if (max && value > max[i]) |
| return -EINVAL; |
| } |
| } |
| return 0; |
| } |
| |
| /* Strategy function to convert jiffies to seconds */ |
| int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| if (oldval && oldlenp) { |
| size_t olen; |
| |
| if (get_user(olen, oldlenp)) |
| return -EFAULT; |
| if (olen) { |
| int val; |
| |
| if (olen < sizeof(int)) |
| return -EINVAL; |
| |
| val = *(int *)(table->data) / HZ; |
| if (put_user(val, (int __user *)oldval)) |
| return -EFAULT; |
| if (put_user(sizeof(int), oldlenp)) |
| return -EFAULT; |
| } |
| } |
| if (newval && newlen) { |
| int new; |
| if (newlen != sizeof(int)) |
| return -EINVAL; |
| if (get_user(new, (int __user *)newval)) |
| return -EFAULT; |
| *(int *)(table->data) = new*HZ; |
| } |
| return 1; |
| } |
| |
| /* Strategy function to convert jiffies to seconds */ |
| int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| if (oldval && oldlenp) { |
| size_t olen; |
| |
| if (get_user(olen, oldlenp)) |
| return -EFAULT; |
| if (olen) { |
| int val; |
| |
| if (olen < sizeof(int)) |
| return -EINVAL; |
| |
| val = jiffies_to_msecs(*(int *)(table->data)); |
| if (put_user(val, (int __user *)oldval)) |
| return -EFAULT; |
| if (put_user(sizeof(int), oldlenp)) |
| return -EFAULT; |
| } |
| } |
| if (newval && newlen) { |
| int new; |
| if (newlen != sizeof(int)) |
| return -EINVAL; |
| if (get_user(new, (int __user *)newval)) |
| return -EFAULT; |
| *(int *)(table->data) = msecs_to_jiffies(new); |
| } |
| return 1; |
| } |
| |
| |
| |
| #else /* CONFIG_SYSCTL_SYSCALL */ |
| |
| |
| asmlinkage long sys_sysctl(struct __sysctl_args __user *args) |
| { |
| struct __sysctl_args tmp; |
| int error; |
| |
| if (copy_from_user(&tmp, args, sizeof(tmp))) |
| return -EFAULT; |
| |
| error = deprecated_sysctl_warning(&tmp); |
| |
| /* If no error reading the parameters then just -ENOSYS ... */ |
| if (!error) |
| error = -ENOSYS; |
| |
| return error; |
| } |
| |
| int sysctl_data(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| return -ENOSYS; |
| } |
| |
| int sysctl_string(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| return -ENOSYS; |
| } |
| |
| int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| return -ENOSYS; |
| } |
| |
| int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| return -ENOSYS; |
| } |
| |
| int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, |
| void __user *oldval, size_t __user *oldlenp, |
| void __user *newval, size_t newlen) |
| { |
| return -ENOSYS; |
| } |
| |
| #endif /* CONFIG_SYSCTL_SYSCALL */ |
| |
| static int deprecated_sysctl_warning(struct __sysctl_args *args) |
| { |
| static int msg_count; |
| int name[CTL_MAXNAME]; |
| int i; |
| |
| /* Check args->nlen. */ |
| if (args->nlen < 0 || args->nlen > CTL_MAXNAME) |
| return -ENOTDIR; |
| |
| /* Read in the sysctl name for better debug message logging */ |
| for (i = 0; i < args->nlen; i++) |
| if (get_user(name[i], args->name + i)) |
| return -EFAULT; |
| |
| /* Ignore accesses to kernel.version */ |
| if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) |
| return 0; |
| |
| if (msg_count < 5) { |
| msg_count++; |
| printk(KERN_INFO |
| "warning: process `%s' used the deprecated sysctl " |
| "system call with ", current->comm); |
| for (i = 0; i < args->nlen; i++) |
| printk("%d.", name[i]); |
| printk("\n"); |
| } |
| return 0; |
| } |
| |
| /* |
| * No sense putting this after each symbol definition, twice, |
| * exception granted :-) |
| */ |
| EXPORT_SYMBOL(proc_dointvec); |
| EXPORT_SYMBOL(proc_dointvec_jiffies); |
| EXPORT_SYMBOL(proc_dointvec_minmax); |
| 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); |
| EXPORT_SYMBOL(register_sysctl_table); |
| EXPORT_SYMBOL(register_sysctl_paths); |
| EXPORT_SYMBOL(sysctl_intvec); |
| EXPORT_SYMBOL(sysctl_jiffies); |
| EXPORT_SYMBOL(sysctl_ms_jiffies); |
| EXPORT_SYMBOL(sysctl_string); |
| EXPORT_SYMBOL(sysctl_data); |
| EXPORT_SYMBOL(unregister_sysctl_table); |