3149 lines
74 KiB
C
3149 lines
74 KiB
C
/*
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* sysctl.c: General linux system control interface
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*
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* Begun 24 March 1995, Stephen Tweedie
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* Added /proc support, Dec 1995
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* Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
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* Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
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* Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
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* Dynamic registration fixes, Stephen Tweedie.
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* Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
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* Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
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* Horn.
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* Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
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* Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
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* Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
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* Wendling.
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* The list_for_each() macro wasn't appropriate for the sysctl loop.
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* Removed it and replaced it with older style, 03/23/00, Bill Wendling
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/proc_fs.h>
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#include <linux/security.h>
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#include <linux/ctype.h>
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#include <linux/utsname.h>
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#include <linux/smp_lock.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/kobject.h>
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#include <linux/net.h>
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#include <linux/sysrq.h>
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#include <linux/highuid.h>
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#include <linux/writeback.h>
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#include <linux/hugetlb.h>
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#include <linux/initrd.h>
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#include <linux/key.h>
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#include <linux/times.h>
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#include <linux/limits.h>
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#include <linux/dcache.h>
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#include <linux/syscalls.h>
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#include <linux/vmstat.h>
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#include <linux/nfs_fs.h>
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#include <linux/acpi.h>
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#include <linux/reboot.h>
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#include <linux/ftrace.h>
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#include <linux/slow-work.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#ifdef CONFIG_X86
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#include <asm/nmi.h>
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#include <asm/stacktrace.h>
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#include <asm/io.h>
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#endif
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static int deprecated_sysctl_warning(struct __sysctl_args *args);
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#if defined(CONFIG_SYSCTL)
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/* External variables not in a header file. */
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extern int C_A_D;
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extern int print_fatal_signals;
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extern int sysctl_overcommit_memory;
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extern int sysctl_overcommit_ratio;
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extern int sysctl_panic_on_oom;
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extern int sysctl_oom_kill_allocating_task;
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extern int sysctl_oom_dump_tasks;
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extern int max_threads;
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extern int core_uses_pid;
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extern int suid_dumpable;
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extern char core_pattern[];
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extern int pid_max;
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extern int min_free_kbytes;
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extern int pid_max_min, pid_max_max;
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extern int sysctl_drop_caches;
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extern int percpu_pagelist_fraction;
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extern int compat_log;
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extern int latencytop_enabled;
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extern int sysctl_nr_open_min, sysctl_nr_open_max;
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#ifndef CONFIG_MMU
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extern int sysctl_nr_trim_pages;
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#endif
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#ifdef CONFIG_RCU_TORTURE_TEST
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extern int rcutorture_runnable;
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#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
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/* Constants used for minimum and maximum */
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#ifdef CONFIG_DETECT_SOFTLOCKUP
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static int sixty = 60;
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static int neg_one = -1;
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#endif
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static int zero;
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static int __maybe_unused one = 1;
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static int __maybe_unused two = 2;
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static unsigned long one_ul = 1;
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static int one_hundred = 100;
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static int one_thousand = 1000;
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/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
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static int maxolduid = 65535;
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static int minolduid;
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static int min_percpu_pagelist_fract = 8;
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static int ngroups_max = NGROUPS_MAX;
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#ifdef CONFIG_MODULES
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extern char modprobe_path[];
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#endif
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#ifdef CONFIG_CHR_DEV_SG
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extern int sg_big_buff;
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#endif
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#ifdef CONFIG_SPARC
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#include <asm/system.h>
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#endif
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#ifdef CONFIG_SPARC64
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extern int sysctl_tsb_ratio;
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#endif
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#ifdef __hppa__
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extern int pwrsw_enabled;
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extern int unaligned_enabled;
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#endif
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#ifdef CONFIG_S390
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#ifdef CONFIG_MATHEMU
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extern int sysctl_ieee_emulation_warnings;
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#endif
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extern int sysctl_userprocess_debug;
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extern int spin_retry;
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#endif
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#ifdef CONFIG_BSD_PROCESS_ACCT
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extern int acct_parm[];
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#endif
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#ifdef CONFIG_IA64
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extern int no_unaligned_warning;
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extern int unaligned_dump_stack;
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#endif
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#ifdef CONFIG_RT_MUTEXES
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extern int max_lock_depth;
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#endif
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#ifdef CONFIG_PROC_SYSCTL
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static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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static int proc_taint(struct ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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#endif
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static struct ctl_table root_table[];
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static struct ctl_table_root sysctl_table_root;
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static struct ctl_table_header root_table_header = {
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.count = 1,
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.ctl_table = root_table,
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.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
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.root = &sysctl_table_root,
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.set = &sysctl_table_root.default_set,
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};
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static struct ctl_table_root sysctl_table_root = {
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.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
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.default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
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};
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static struct ctl_table kern_table[];
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static struct ctl_table vm_table[];
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static struct ctl_table fs_table[];
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static struct ctl_table debug_table[];
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static struct ctl_table dev_table[];
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extern struct ctl_table random_table[];
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#ifdef CONFIG_INOTIFY_USER
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extern struct ctl_table inotify_table[];
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#endif
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#ifdef CONFIG_EPOLL
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extern struct ctl_table epoll_table[];
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#endif
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#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
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int sysctl_legacy_va_layout;
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#endif
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extern int prove_locking;
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extern int lock_stat;
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/* The default sysctl tables: */
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static struct ctl_table root_table[] = {
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{
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.ctl_name = CTL_KERN,
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.procname = "kernel",
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.mode = 0555,
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.child = kern_table,
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},
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{
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.ctl_name = CTL_VM,
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.procname = "vm",
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.mode = 0555,
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.child = vm_table,
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},
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{
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.ctl_name = CTL_FS,
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.procname = "fs",
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.mode = 0555,
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.child = fs_table,
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},
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{
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.ctl_name = CTL_DEBUG,
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.procname = "debug",
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.mode = 0555,
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.child = debug_table,
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},
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{
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.ctl_name = CTL_DEV,
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.procname = "dev",
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.mode = 0555,
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.child = dev_table,
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},
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/*
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* NOTE: do not add new entries to this table unless you have read
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* Documentation/sysctl/ctl_unnumbered.txt
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*/
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{ .ctl_name = 0 }
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};
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#ifdef CONFIG_SCHED_DEBUG
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static int min_sched_granularity_ns = 100000; /* 100 usecs */
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static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
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static int min_wakeup_granularity_ns; /* 0 usecs */
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static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
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#endif
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static struct ctl_table kern_table[] = {
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#ifdef CONFIG_SCHED_DEBUG
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_min_granularity_ns",
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.data = &sysctl_sched_min_granularity,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &sched_nr_latency_handler,
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.strategy = &sysctl_intvec,
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.extra1 = &min_sched_granularity_ns,
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.extra2 = &max_sched_granularity_ns,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_latency_ns",
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.data = &sysctl_sched_latency,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &sched_nr_latency_handler,
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.strategy = &sysctl_intvec,
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.extra1 = &min_sched_granularity_ns,
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.extra2 = &max_sched_granularity_ns,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_wakeup_granularity_ns",
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.data = &sysctl_sched_wakeup_granularity,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &min_wakeup_granularity_ns,
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.extra2 = &max_wakeup_granularity_ns,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_shares_ratelimit",
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.data = &sysctl_sched_shares_ratelimit,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_shares_thresh",
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.data = &sysctl_sched_shares_thresh,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec_minmax,
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.strategy = &sysctl_intvec,
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.extra1 = &zero,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_child_runs_first",
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.data = &sysctl_sched_child_runs_first,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_features",
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.data = &sysctl_sched_features,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_migration_cost",
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.data = &sysctl_sched_migration_cost,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_nr_migrate",
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.data = &sysctl_sched_nr_migrate,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_rt_period_us",
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.data = &sysctl_sched_rt_period,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &sched_rt_handler,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_rt_runtime_us",
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.data = &sysctl_sched_rt_runtime,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &sched_rt_handler,
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},
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "sched_compat_yield",
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.data = &sysctl_sched_compat_yield,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#ifdef CONFIG_PROVE_LOCKING
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "prove_locking",
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.data = &prove_locking,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef CONFIG_LOCK_STAT
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "lock_stat",
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.data = &lock_stat,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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{
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.ctl_name = KERN_PANIC,
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.procname = "panic",
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.data = &panic_timeout,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_CORE_USES_PID,
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.procname = "core_uses_pid",
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.data = &core_uses_pid,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_CORE_PATTERN,
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.procname = "core_pattern",
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.data = core_pattern,
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.maxlen = CORENAME_MAX_SIZE,
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.mode = 0644,
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.proc_handler = &proc_dostring,
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.strategy = &sysctl_string,
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},
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#ifdef CONFIG_PROC_SYSCTL
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{
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.procname = "tainted",
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.maxlen = sizeof(long),
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.mode = 0644,
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.proc_handler = &proc_taint,
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},
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#endif
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#ifdef CONFIG_LATENCYTOP
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{
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.procname = "latencytop",
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.data = &latencytop_enabled,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef CONFIG_BLK_DEV_INITRD
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{
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.ctl_name = KERN_REALROOTDEV,
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.procname = "real-root-dev",
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.data = &real_root_dev,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "print-fatal-signals",
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.data = &print_fatal_signals,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#ifdef CONFIG_SPARC
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{
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.ctl_name = KERN_SPARC_REBOOT,
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.procname = "reboot-cmd",
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.data = reboot_command,
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.maxlen = 256,
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.mode = 0644,
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.proc_handler = &proc_dostring,
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.strategy = &sysctl_string,
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},
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{
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.ctl_name = KERN_SPARC_STOP_A,
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.procname = "stop-a",
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.data = &stop_a_enabled,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_SPARC_SCONS_PWROFF,
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.procname = "scons-poweroff",
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.data = &scons_pwroff,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef CONFIG_SPARC64
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "tsb-ratio",
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.data = &sysctl_tsb_ratio,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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#ifdef __hppa__
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{
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.ctl_name = KERN_HPPA_PWRSW,
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.procname = "soft-power",
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.data = &pwrsw_enabled,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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{
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.ctl_name = KERN_HPPA_UNALIGNED,
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.procname = "unaligned-trap",
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.data = &unaligned_enabled,
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.maxlen = sizeof (int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#endif
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{
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.ctl_name = KERN_CTLALTDEL,
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.procname = "ctrl-alt-del",
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.data = &C_A_D,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &proc_dointvec,
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},
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#ifdef CONFIG_FUNCTION_TRACER
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{
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.ctl_name = CTL_UNNUMBERED,
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.procname = "ftrace_enabled",
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.data = &ftrace_enabled,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = &ftrace_enable_sysctl,
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},
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#endif
|
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#ifdef CONFIG_STACK_TRACER
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{
|
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.ctl_name = CTL_UNNUMBERED,
|
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.procname = "stack_tracer_enabled",
|
|
.data = &stack_tracer_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &stack_trace_sysctl,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_TRACING
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "ftrace_dump_on_oops",
|
|
.data = &ftrace_dump_on_oops,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_MODULES
|
|
{
|
|
.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
|
|
{
|
|
.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_state.interval,
|
|
.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_state.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,
|
|
},
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "unaligned-dump-stack",
|
|
.data = &unaligned_dump_stack,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_DETECT_SOFTLOCKUP
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "softlockup_panic",
|
|
.data = &softlockup_panic,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "softlockup_thresh",
|
|
.data = &softlockup_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dosoftlockup_thresh,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &neg_one,
|
|
.extra2 = &sixty,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_DETECT_HUNG_TASK
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "hung_task_panic",
|
|
.data = &sysctl_hung_task_panic,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.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_dohung_task_timeout_secs,
|
|
.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
|
|
{
|
|
.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
|
|
#ifdef CONFIG_RCU_TORTURE_TEST
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "rcutorture_runnable",
|
|
.data = &rcutorture_runnable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SLOW_WORK
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "slow-work",
|
|
.mode = 0555,
|
|
.child = slow_work_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 = &dirty_background_ratio_handler,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "dirty_background_bytes",
|
|
.data = &dirty_background_bytes,
|
|
.maxlen = sizeof(dirty_background_bytes),
|
|
.mode = 0644,
|
|
.proc_handler = &dirty_background_bytes_handler,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &one_ul,
|
|
},
|
|
{
|
|
.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,
|
|
},
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "dirty_bytes",
|
|
.data = &vm_dirty_bytes,
|
|
.maxlen = sizeof(vm_dirty_bytes),
|
|
.mode = 0644,
|
|
.proc_handler = &dirty_bytes_handler,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &one_ul,
|
|
},
|
|
{
|
|
.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,
|
|
},
|
|
{
|
|
.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 = CTL_UNNUMBERED,
|
|
.procname = "nr_pdflush_threads_min",
|
|
.data = &nr_pdflush_threads_min,
|
|
.maxlen = sizeof nr_pdflush_threads_min,
|
|
.mode = 0644 /* read-write */,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &one,
|
|
.extra2 = &nr_pdflush_threads_max,
|
|
},
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "nr_pdflush_threads_max",
|
|
.data = &nr_pdflush_threads_max,
|
|
.maxlen = sizeof nr_pdflush_threads_max,
|
|
.mode = 0644 /* read-write */,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &nr_pdflush_threads_min,
|
|
.extra2 = &one_thousand,
|
|
},
|
|
{
|
|
.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 = NULL,
|
|
.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 = NULL,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = &hugetlb_overcommit_handler,
|
|
.extra1 = (void *)&hugetlb_zero,
|
|
.extra2 = (void *)&hugetlb_infinity,
|
|
},
|
|
#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
|
|
},
|
|
#else
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "nr_trim_pages",
|
|
.data = &sysctl_nr_trim_pages,
|
|
.maxlen = sizeof(sysctl_nr_trim_pages),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
},
|
|
#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
|
|
#ifdef CONFIG_UNEVICTABLE_LRU
|
|
{
|
|
.ctl_name = CTL_UNNUMBERED,
|
|
.procname = "scan_unevictable_pages",
|
|
.data = &scan_unevictable_pages,
|
|
.maxlen = sizeof(scan_unevictable_pages),
|
|
.mode = 0644,
|
|
.proc_handler = &scan_unevictable_handler,
|
|
},
|
|
#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,
|
|
},
|
|
#ifdef CONFIG_FILE_LOCKING
|
|
{
|
|
.ctl_name = FS_LEASES,
|
|
.procname = "leases-enable",
|
|
.data = &leases_enable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
#endif
|
|
#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
|
|
#ifdef CONFIG_FILE_LOCKING
|
|
{
|
|
.ctl_name = FS_LEASE_TIME,
|
|
.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
|
|
{
|
|
.ctl_name = FS_INOTIFY,
|
|
.procname = "inotify",
|
|
.mode = 0555,
|
|
.child = inotify_table,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_EPOLL
|
|
{
|
|
.procname = "epoll",
|
|
.mode = 0555,
|
|
.child = epoll_table,
|
|
},
|
|
#endif
|
|
#endif
|
|
{
|
|
.ctl_name = KERN_SETUID_DUMPABLE,
|
|
.procname = "suid_dumpable",
|
|
.data = &suid_dumpable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_minmax,
|
|
.strategy = &sysctl_intvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &two,
|
|
},
|
|
#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);
|
|
} else {
|
|
/* anything non-NULL; we'll never dereference it */
|
|
p->unregistering = ERR_PTR(-EINVAL);
|
|
}
|
|
/*
|
|
* 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_get(struct ctl_table_header *head)
|
|
{
|
|
spin_lock(&sysctl_lock);
|
|
head->count++;
|
|
spin_unlock(&sysctl_lock);
|
|
}
|
|
|
|
void sysctl_head_put(struct ctl_table_header *head)
|
|
{
|
|
spin_lock(&sysctl_lock);
|
|
if (!--head->count)
|
|
kfree(head);
|
|
spin_unlock(&sysctl_lock);
|
|
}
|
|
|
|
struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
|
|
{
|
|
if (!head)
|
|
BUG();
|
|
spin_lock(&sysctl_lock);
|
|
if (!use_table(head))
|
|
head = ERR_PTR(-ENOENT);
|
|
spin_unlock(&sysctl_lock);
|
|
return head;
|
|
}
|
|
|
|
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 ctl_table_set *
|
|
lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
|
|
{
|
|
struct ctl_table_set *set = &root->default_set;
|
|
if (root->lookup)
|
|
set = root->lookup(root, namespaces);
|
|
return set;
|
|
}
|
|
|
|
static struct list_head *
|
|
lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
|
|
{
|
|
struct ctl_table_set *set = lookup_header_set(root, namespaces);
|
|
return &set->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,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
int op = 0, rc;
|
|
|
|
if (oldval)
|
|
op |= MAY_READ;
|
|
if (newval)
|
|
op |= MAY_WRITE;
|
|
if (sysctl_perm(root, table, op))
|
|
return -EPERM;
|
|
|
|
if (table->strategy) {
|
|
rc = table->strategy(table, 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, 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, MAY_EXEC))
|
|
return -EPERM;
|
|
name++;
|
|
nlen--;
|
|
table = table->child;
|
|
goto repeat;
|
|
}
|
|
error = do_sysctl_strategy(root, table,
|
|
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;
|
|
}
|
|
|
|
SYSCALL_DEFINE1(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 ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
|
|
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 & (MAY_READ | MAY_WRITE | MAY_EXEC));
|
|
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);
|
|
|
|
static struct ctl_table *is_branch_in(struct ctl_table *branch,
|
|
struct ctl_table *table)
|
|
{
|
|
struct ctl_table *p;
|
|
const char *s = branch->procname;
|
|
|
|
/* branch should have named subdirectory as its first element */
|
|
if (!s || !branch->child)
|
|
return NULL;
|
|
|
|
/* ... and nothing else */
|
|
if (branch[1].procname || branch[1].ctl_name)
|
|
return NULL;
|
|
|
|
/* table should contain subdirectory with the same name */
|
|
for (p = table; p->procname || p->ctl_name; p++) {
|
|
if (!p->child)
|
|
continue;
|
|
if (p->procname && strcmp(p->procname, s) == 0)
|
|
return p;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* see if attaching q to p would be an improvement */
|
|
static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
|
|
{
|
|
struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
|
|
struct ctl_table *next;
|
|
int is_better = 0;
|
|
int not_in_parent = !p->attached_by;
|
|
|
|
while ((next = is_branch_in(by, to)) != NULL) {
|
|
if (by == q->attached_by)
|
|
is_better = 1;
|
|
if (to == p->attached_by)
|
|
not_in_parent = 1;
|
|
by = by->child;
|
|
to = next->child;
|
|
}
|
|
|
|
if (is_better && not_in_parent) {
|
|
q->attached_by = by;
|
|
q->attached_to = to;
|
|
q->parent = p;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* __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 ctl_table_header *header;
|
|
struct ctl_table *new, **prevp;
|
|
unsigned int n, npath;
|
|
struct ctl_table_set *set;
|
|
|
|
/* 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);
|
|
header->count = 1;
|
|
#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
|
|
if (sysctl_check_table(namespaces, header->ctl_table)) {
|
|
kfree(header);
|
|
return NULL;
|
|
}
|
|
#endif
|
|
spin_lock(&sysctl_lock);
|
|
header->set = lookup_header_set(root, namespaces);
|
|
header->attached_by = header->ctl_table;
|
|
header->attached_to = root_table;
|
|
header->parent = &root_table_header;
|
|
for (set = header->set; set; set = set->parent) {
|
|
struct ctl_table_header *p;
|
|
list_for_each_entry(p, &set->list, ctl_entry) {
|
|
if (p->unregistering)
|
|
continue;
|
|
try_attach(p, header);
|
|
}
|
|
}
|
|
header->parent->count++;
|
|
list_add_tail(&header->ctl_entry, &header->set->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);
|
|
if (!--header->parent->count) {
|
|
WARN_ON(1);
|
|
kfree(header->parent);
|
|
}
|
|
if (!--header->count)
|
|
kfree(header);
|
|
spin_unlock(&sysctl_lock);
|
|
}
|
|
|
|
int sysctl_is_seen(struct ctl_table_header *p)
|
|
{
|
|
struct ctl_table_set *set = p->set;
|
|
int res;
|
|
spin_lock(&sysctl_lock);
|
|
if (p->unregistering)
|
|
res = 0;
|
|
else if (!set->is_seen)
|
|
res = 1;
|
|
else
|
|
res = set->is_seen(set);
|
|
spin_unlock(&sysctl_lock);
|
|
return res;
|
|
}
|
|
|
|
void setup_sysctl_set(struct ctl_table_set *p,
|
|
struct ctl_table_set *parent,
|
|
int (*is_seen)(struct ctl_table_set *))
|
|
{
|
|
INIT_LIST_HEAD(&p->list);
|
|
p->parent = parent ? parent : &sysctl_table_root.default_set;
|
|
p->is_seen = is_seen;
|
|
}
|
|
|
|
#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)
|
|
{
|
|
}
|
|
|
|
void setup_sysctl_set(struct ctl_table_set *p,
|
|
struct ctl_table_set *parent,
|
|
int (*is_seen)(struct ctl_table_set *))
|
|
{
|
|
}
|
|
|
|
void sysctl_head_put(struct ctl_table_header *head)
|
|
{
|
|
}
|
|
|
|
#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);
|
|
}
|
|
|
|
/*
|
|
* Taint values can only be increased
|
|
* This means we can safely use a temporary.
|
|
*/
|
|
static int proc_taint(struct ctl_table *table, int write, struct file *filp,
|
|
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, filp, 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);
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
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,
|
|
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,
|
|
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,
|
|
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,
|
|
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,
|
|
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 */
|
|
|
|
|
|
SYSCALL_DEFINE1(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,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_string(struct ctl_table *table,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_intvec(struct ctl_table *table,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_jiffies(struct ctl_table *table,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int sysctl_ms_jiffies(struct ctl_table *table,
|
|
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 :-)
|
|
*/
|
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EXPORT_SYMBOL(proc_dointvec);
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EXPORT_SYMBOL(proc_dointvec_jiffies);
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EXPORT_SYMBOL(proc_dointvec_minmax);
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EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
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EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
|
|
EXPORT_SYMBOL(proc_dostring);
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EXPORT_SYMBOL(proc_doulongvec_minmax);
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EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
|
|
EXPORT_SYMBOL(register_sysctl_table);
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|
EXPORT_SYMBOL(register_sysctl_paths);
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|
EXPORT_SYMBOL(sysctl_intvec);
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|
EXPORT_SYMBOL(sysctl_jiffies);
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|
EXPORT_SYMBOL(sysctl_ms_jiffies);
|
|
EXPORT_SYMBOL(sysctl_string);
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|
EXPORT_SYMBOL(sysctl_data);
|
|
EXPORT_SYMBOL(unregister_sysctl_table);
|