3226 lines
75 KiB
C
3226 lines
75 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/aio.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/bitmap.h>
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#include <linux/signal.h>
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#include <linux/printk.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/kmemleak.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/ratelimit.h>
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#include <linux/compaction.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/dnotify.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/perf_event.h>
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#include <linux/kprobes.h>
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#include <linux/pipe_fs_i.h>
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#include <linux/oom.h>
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#include <linux/kmod.h>
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#include <linux/capability.h>
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#include <linux/binfmts.h>
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#include <linux/sched/sysctl.h>
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#include <linux/sched/coredump.h>
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#include <linux/kexec.h>
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#include <linux/bpf.h>
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#include <linux/mount.h>
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#include <linux/pipe_fs_i.h>
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#include <linux/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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#ifdef CONFIG_SPARC
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#include <asm/setup.h>
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#endif
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#ifdef CONFIG_BSD_PROCESS_ACCT
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#include <linux/acct.h>
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#endif
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#ifdef CONFIG_RT_MUTEXES
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#include <linux/rtmutex.h>
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#endif
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#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
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#include <linux/lockdep.h>
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#endif
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#ifdef CONFIG_CHR_DEV_SG
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#include <scsi/sg.h>
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#endif
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#ifdef CONFIG_LOCKUP_DETECTOR
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#include <linux/nmi.h>
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#endif
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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 suid_dumpable;
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#ifdef CONFIG_COREDUMP
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extern int core_uses_pid;
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extern char core_pattern[];
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extern unsigned int core_pipe_limit;
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#endif
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extern int pid_max;
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extern int pid_max_min, pid_max_max;
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extern int percpu_pagelist_fraction;
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extern int latencytop_enabled;
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extern unsigned 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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/* Constants used for minimum and maximum */
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#ifdef CONFIG_LOCKUP_DETECTOR
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static int sixty = 60;
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#endif
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static int __maybe_unused neg_one = -1;
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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 int __maybe_unused four = 4;
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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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#ifdef CONFIG_PRINTK
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static int ten_thousand = 10000;
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#endif
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#ifdef CONFIG_PERF_EVENTS
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static int six_hundred_forty_kb = 640 * 1024;
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#endif
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/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
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static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
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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 ngroups_max = NGROUPS_MAX;
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static const int cap_last_cap = CAP_LAST_CAP;
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/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
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#ifdef CONFIG_DETECT_HUNG_TASK
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static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
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#endif
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#ifdef CONFIG_INOTIFY_USER
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#include <linux/inotify.h>
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#endif
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#ifdef CONFIG_SPARC
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#endif
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#ifdef __hppa__
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extern int pwrsw_enabled;
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#endif
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#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
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extern int unaligned_enabled;
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#endif
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#ifdef CONFIG_IA64
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extern int unaligned_dump_stack;
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#endif
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#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
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extern int no_unaligned_warning;
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#endif
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#ifdef CONFIG_PROC_SYSCTL
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/**
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* enum sysctl_writes_mode - supported sysctl write modes
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*
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* @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
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* to be written, and multiple writes on the same sysctl file descriptor
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* will rewrite the sysctl value, regardless of file position. No warning
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* is issued when the initial position is not 0.
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* @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
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* not 0.
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* @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
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* file position 0 and the value must be fully contained in the buffer
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* sent to the write syscall. If dealing with strings respect the file
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* position, but restrict this to the max length of the buffer, anything
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* passed the max lenght will be ignored. Multiple writes will append
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* to the buffer.
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*
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* These write modes control how current file position affects the behavior of
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* updating sysctl values through the proc interface on each write.
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*/
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enum sysctl_writes_mode {
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SYSCTL_WRITES_LEGACY = -1,
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SYSCTL_WRITES_WARN = 0,
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SYSCTL_WRITES_STRICT = 1,
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};
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static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
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static int proc_do_cad_pid(struct ctl_table *table, int write,
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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,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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#endif
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#ifdef CONFIG_PRINTK
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static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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#endif
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static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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#ifdef CONFIG_COREDUMP
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static int proc_dostring_coredump(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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#endif
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static int proc_dopipe_max_size(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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#ifdef CONFIG_MAGIC_SYSRQ
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/* Note: sysrq code uses it's own private copy */
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static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
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static int sysrq_sysctl_handler(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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int error;
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error = proc_dointvec(table, write, buffer, lenp, ppos);
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if (error)
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return error;
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if (write)
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sysrq_toggle_support(__sysrq_enabled);
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return 0;
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}
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#endif
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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_EPOLL
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extern struct ctl_table epoll_table[];
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#endif
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#ifdef CONFIG_FW_LOADER_USER_HELPER
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extern struct ctl_table firmware_config_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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/* The default sysctl tables: */
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static struct ctl_table sysctl_base_table[] = {
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{
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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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.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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.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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.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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.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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};
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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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#ifdef CONFIG_SMP
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static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
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static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
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#endif /* CONFIG_SMP */
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#endif /* CONFIG_SCHED_DEBUG */
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#ifdef CONFIG_COMPACTION
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static int min_extfrag_threshold;
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static int max_extfrag_threshold = 1000;
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#endif
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static struct ctl_table kern_table[] = {
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{
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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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#ifdef CONFIG_SCHED_DEBUG
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{
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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_proc_update_handler,
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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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.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_proc_update_handler,
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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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.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 = sched_proc_update_handler,
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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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#ifdef CONFIG_SMP
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{
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.procname = "sched_tunable_scaling",
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.data = &sysctl_sched_tunable_scaling,
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.maxlen = sizeof(enum sched_tunable_scaling),
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.mode = 0644,
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.proc_handler = sched_proc_update_handler,
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.extra1 = &min_sched_tunable_scaling,
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.extra2 = &max_sched_tunable_scaling,
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},
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{
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.procname = "sched_migration_cost_ns",
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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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.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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{
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.procname = "sched_time_avg_ms",
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.data = &sysctl_sched_time_avg,
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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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.extra1 = &one,
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},
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#ifdef CONFIG_SCHEDSTATS
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{
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.procname = "sched_schedstats",
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.data = NULL,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = sysctl_schedstats,
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.extra1 = &zero,
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.extra2 = &one,
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},
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#endif /* CONFIG_SCHEDSTATS */
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_NUMA_BALANCING
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{
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.procname = "numa_balancing_scan_delay_ms",
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.data = &sysctl_numa_balancing_scan_delay,
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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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.procname = "numa_balancing_scan_period_min_ms",
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.data = &sysctl_numa_balancing_scan_period_min,
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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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.procname = "numa_balancing_scan_period_max_ms",
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.data = &sysctl_numa_balancing_scan_period_max,
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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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.procname = "numa_balancing_scan_size_mb",
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.data = &sysctl_numa_balancing_scan_size,
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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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.extra1 = &one,
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},
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{
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.procname = "numa_balancing",
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.data = NULL, /* filled in by handler */
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = sysctl_numa_balancing,
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.extra1 = &zero,
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.extra2 = &one,
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},
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#endif /* CONFIG_NUMA_BALANCING */
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#endif /* CONFIG_SCHED_DEBUG */
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{
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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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.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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.procname = "sched_rr_timeslice_ms",
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.data = &sysctl_sched_rr_timeslice,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = sched_rr_handler,
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},
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|
#ifdef CONFIG_SCHED_AUTOGROUP
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{
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.procname = "sched_autogroup_enabled",
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.data = &sysctl_sched_autogroup_enabled,
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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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.extra1 = &zero,
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.extra2 = &one,
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},
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#endif
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#ifdef CONFIG_CFS_BANDWIDTH
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{
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.procname = "sched_cfs_bandwidth_slice_us",
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.data = &sysctl_sched_cfs_bandwidth_slice,
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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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.extra1 = &one,
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},
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#endif
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|
#ifdef CONFIG_PROVE_LOCKING
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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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|
.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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|
.procname = "panic",
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|
.data = &panic_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#ifdef CONFIG_COREDUMP
|
|
{
|
|
.procname = "core_uses_pid",
|
|
.data = &core_uses_pid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "core_pattern",
|
|
.data = core_pattern,
|
|
.maxlen = CORENAME_MAX_SIZE,
|
|
.mode = 0644,
|
|
.proc_handler = proc_dostring_coredump,
|
|
},
|
|
{
|
|
.procname = "core_pipe_limit",
|
|
.data = &core_pipe_limit,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_PROC_SYSCTL
|
|
{
|
|
.procname = "tainted",
|
|
.maxlen = sizeof(long),
|
|
.mode = 0644,
|
|
.proc_handler = proc_taint,
|
|
},
|
|
{
|
|
.procname = "sysctl_writes_strict",
|
|
.data = &sysctl_writes_strict,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &neg_one,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_LATENCYTOP
|
|
{
|
|
.procname = "latencytop",
|
|
.data = &latencytop_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = sysctl_latencytop,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
{
|
|
.procname = "real-root-dev",
|
|
.data = &real_root_dev,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "print-fatal-signals",
|
|
.data = &print_fatal_signals,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#ifdef CONFIG_SPARC
|
|
{
|
|
.procname = "reboot-cmd",
|
|
.data = reboot_command,
|
|
.maxlen = 256,
|
|
.mode = 0644,
|
|
.proc_handler = proc_dostring,
|
|
},
|
|
{
|
|
.procname = "stop-a",
|
|
.data = &stop_a_enabled,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "scons-poweroff",
|
|
.data = &scons_pwroff,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SPARC64
|
|
{
|
|
.procname = "tsb-ratio",
|
|
.data = &sysctl_tsb_ratio,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef __hppa__
|
|
{
|
|
.procname = "soft-power",
|
|
.data = &pwrsw_enabled,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
|
|
{
|
|
.procname = "unaligned-trap",
|
|
.data = &unaligned_enabled,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "ctrl-alt-del",
|
|
.data = &C_A_D,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#ifdef CONFIG_FUNCTION_TRACER
|
|
{
|
|
.procname = "ftrace_enabled",
|
|
.data = &ftrace_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = ftrace_enable_sysctl,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_STACK_TRACER
|
|
{
|
|
.procname = "stack_tracer_enabled",
|
|
.data = &stack_tracer_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = stack_trace_sysctl,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_TRACING
|
|
{
|
|
.procname = "ftrace_dump_on_oops",
|
|
.data = &ftrace_dump_on_oops,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "traceoff_on_warning",
|
|
.data = &__disable_trace_on_warning,
|
|
.maxlen = sizeof(__disable_trace_on_warning),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tracepoint_printk",
|
|
.data = &tracepoint_printk,
|
|
.maxlen = sizeof(tracepoint_printk),
|
|
.mode = 0644,
|
|
.proc_handler = tracepoint_printk_sysctl,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
{
|
|
.procname = "kexec_load_disabled",
|
|
.data = &kexec_load_disabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
/* only handle a transition from default "0" to "1" */
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_MODULES
|
|
{
|
|
.procname = "modprobe",
|
|
.data = &modprobe_path,
|
|
.maxlen = KMOD_PATH_LEN,
|
|
.mode = 0644,
|
|
.proc_handler = proc_dostring,
|
|
},
|
|
{
|
|
.procname = "modules_disabled",
|
|
.data = &modules_disabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
/* only handle a transition from default "0" to "1" */
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_UEVENT_HELPER
|
|
{
|
|
.procname = "hotplug",
|
|
.data = &uevent_helper,
|
|
.maxlen = UEVENT_HELPER_PATH_LEN,
|
|
.mode = 0644,
|
|
.proc_handler = proc_dostring,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_CHR_DEV_SG
|
|
{
|
|
.procname = "sg-big-buff",
|
|
.data = &sg_big_buff,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_BSD_PROCESS_ACCT
|
|
{
|
|
.procname = "acct",
|
|
.data = &acct_parm,
|
|
.maxlen = 3*sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
{
|
|
.procname = "sysrq",
|
|
.data = &__sysrq_enabled,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = sysrq_sysctl_handler,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_PROC_SYSCTL
|
|
{
|
|
.procname = "cad_pid",
|
|
.data = NULL,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0600,
|
|
.proc_handler = proc_do_cad_pid,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "threads-max",
|
|
.data = NULL,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = sysctl_max_threads,
|
|
},
|
|
{
|
|
.procname = "random",
|
|
.mode = 0555,
|
|
.child = random_table,
|
|
},
|
|
{
|
|
.procname = "usermodehelper",
|
|
.mode = 0555,
|
|
.child = usermodehelper_table,
|
|
},
|
|
#ifdef CONFIG_FW_LOADER_USER_HELPER
|
|
{
|
|
.procname = "firmware_config",
|
|
.mode = 0555,
|
|
.child = firmware_config_table,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "overflowuid",
|
|
.data = &overflowuid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
{
|
|
.procname = "overflowgid",
|
|
.data = &overflowgid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
#ifdef CONFIG_S390
|
|
#ifdef CONFIG_MATHEMU
|
|
{
|
|
.procname = "ieee_emulation_warnings",
|
|
.data = &sysctl_ieee_emulation_warnings,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "userprocess_debug",
|
|
.data = &show_unhandled_signals,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "pid_max",
|
|
.data = &pid_max,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &pid_max_min,
|
|
.extra2 = &pid_max_max,
|
|
},
|
|
{
|
|
.procname = "panic_on_oops",
|
|
.data = &panic_on_oops,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#if defined CONFIG_PRINTK
|
|
{
|
|
.procname = "printk",
|
|
.data = &console_loglevel,
|
|
.maxlen = 4*sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "printk_ratelimit",
|
|
.data = &printk_ratelimit_state.interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "printk_ratelimit_burst",
|
|
.data = &printk_ratelimit_state.burst,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "printk_delay",
|
|
.data = &printk_delay_msec,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &ten_thousand,
|
|
},
|
|
{
|
|
.procname = "printk_devkmsg",
|
|
.data = devkmsg_log_str,
|
|
.maxlen = DEVKMSG_STR_MAX_SIZE,
|
|
.mode = 0644,
|
|
.proc_handler = devkmsg_sysctl_set_loglvl,
|
|
},
|
|
{
|
|
.procname = "dmesg_restrict",
|
|
.data = &dmesg_restrict,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax_sysadmin,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "kptr_restrict",
|
|
.data = &kptr_restrict,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax_sysadmin,
|
|
.extra1 = &zero,
|
|
.extra2 = &two,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "ngroups_max",
|
|
.data = &ngroups_max,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "cap_last_cap",
|
|
.data = (void *)&cap_last_cap,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#if defined(CONFIG_LOCKUP_DETECTOR)
|
|
{
|
|
.procname = "watchdog",
|
|
.data = &watchdog_user_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_watchdog,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "watchdog_thresh",
|
|
.data = &watchdog_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_watchdog_thresh,
|
|
.extra1 = &zero,
|
|
.extra2 = &sixty,
|
|
},
|
|
{
|
|
.procname = "nmi_watchdog",
|
|
.data = &nmi_watchdog_user_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = NMI_WATCHDOG_SYSCTL_PERM,
|
|
.proc_handler = proc_nmi_watchdog,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "watchdog_cpumask",
|
|
.data = &watchdog_cpumask_bits,
|
|
.maxlen = NR_CPUS,
|
|
.mode = 0644,
|
|
.proc_handler = proc_watchdog_cpumask,
|
|
},
|
|
#ifdef CONFIG_SOFTLOCKUP_DETECTOR
|
|
{
|
|
.procname = "soft_watchdog",
|
|
.data = &soft_watchdog_user_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_soft_watchdog,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "softlockup_panic",
|
|
.data = &softlockup_panic,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#ifdef CONFIG_SMP
|
|
{
|
|
.procname = "softlockup_all_cpu_backtrace",
|
|
.data = &sysctl_softlockup_all_cpu_backtrace,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif /* CONFIG_SMP */
|
|
#endif
|
|
#ifdef CONFIG_HARDLOCKUP_DETECTOR
|
|
{
|
|
.procname = "hardlockup_panic",
|
|
.data = &hardlockup_panic,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#ifdef CONFIG_SMP
|
|
{
|
|
.procname = "hardlockup_all_cpu_backtrace",
|
|
.data = &sysctl_hardlockup_all_cpu_backtrace,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif /* CONFIG_SMP */
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
|
|
{
|
|
.procname = "unknown_nmi_panic",
|
|
.data = &unknown_nmi_panic,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_X86)
|
|
{
|
|
.procname = "panic_on_unrecovered_nmi",
|
|
.data = &panic_on_unrecovered_nmi,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "panic_on_io_nmi",
|
|
.data = &panic_on_io_nmi,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
|
{
|
|
.procname = "panic_on_stackoverflow",
|
|
.data = &sysctl_panic_on_stackoverflow,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "bootloader_type",
|
|
.data = &bootloader_type,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "bootloader_version",
|
|
.data = &bootloader_version,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "io_delay_type",
|
|
.data = &io_delay_type,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_MMU)
|
|
{
|
|
.procname = "randomize_va_space",
|
|
.data = &randomize_va_space,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
|
|
{
|
|
.procname = "spin_retry",
|
|
.data = &spin_retry,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
|
|
{
|
|
.procname = "acpi_video_flags",
|
|
.data = &acpi_realmode_flags,
|
|
.maxlen = sizeof (unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
|
|
{
|
|
.procname = "ignore-unaligned-usertrap",
|
|
.data = &no_unaligned_warning,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_IA64
|
|
{
|
|
.procname = "unaligned-dump-stack",
|
|
.data = &unaligned_dump_stack,
|
|
.maxlen = sizeof (int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_DETECT_HUNG_TASK
|
|
{
|
|
.procname = "hung_task_panic",
|
|
.data = &sysctl_hung_task_panic,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "hung_task_check_count",
|
|
.data = &sysctl_hung_task_check_count,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.procname = "hung_task_timeout_secs",
|
|
.data = &sysctl_hung_task_timeout_secs,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dohung_task_timeout_secs,
|
|
.extra2 = &hung_task_timeout_max,
|
|
},
|
|
{
|
|
.procname = "hung_task_warnings",
|
|
.data = &sysctl_hung_task_warnings,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &neg_one,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_RT_MUTEXES
|
|
{
|
|
.procname = "max_lock_depth",
|
|
.data = &max_lock_depth,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "poweroff_cmd",
|
|
.data = &poweroff_cmd,
|
|
.maxlen = POWEROFF_CMD_PATH_LEN,
|
|
.mode = 0644,
|
|
.proc_handler = proc_dostring,
|
|
},
|
|
#ifdef CONFIG_KEYS
|
|
{
|
|
.procname = "keys",
|
|
.mode = 0555,
|
|
.child = key_sysctls,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
/*
|
|
* User-space scripts rely on the existence of this file
|
|
* as a feature check for perf_events being enabled.
|
|
*
|
|
* So it's an ABI, do not remove!
|
|
*/
|
|
{
|
|
.procname = "perf_event_paranoid",
|
|
.data = &sysctl_perf_event_paranoid,
|
|
.maxlen = sizeof(sysctl_perf_event_paranoid),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "perf_event_mlock_kb",
|
|
.data = &sysctl_perf_event_mlock,
|
|
.maxlen = sizeof(sysctl_perf_event_mlock),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "perf_event_max_sample_rate",
|
|
.data = &sysctl_perf_event_sample_rate,
|
|
.maxlen = sizeof(sysctl_perf_event_sample_rate),
|
|
.mode = 0644,
|
|
.proc_handler = perf_proc_update_handler,
|
|
.extra1 = &one,
|
|
},
|
|
{
|
|
.procname = "perf_cpu_time_max_percent",
|
|
.data = &sysctl_perf_cpu_time_max_percent,
|
|
.maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
|
|
.mode = 0644,
|
|
.proc_handler = perf_cpu_time_max_percent_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
{
|
|
.procname = "perf_event_max_stack",
|
|
.data = &sysctl_perf_event_max_stack,
|
|
.maxlen = sizeof(sysctl_perf_event_max_stack),
|
|
.mode = 0644,
|
|
.proc_handler = perf_event_max_stack_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &six_hundred_forty_kb,
|
|
},
|
|
{
|
|
.procname = "perf_event_max_contexts_per_stack",
|
|
.data = &sysctl_perf_event_max_contexts_per_stack,
|
|
.maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
|
|
.mode = 0644,
|
|
.proc_handler = perf_event_max_stack_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_thousand,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "panic_on_warn",
|
|
.data = &panic_on_warn,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
|
|
{
|
|
.procname = "timer_migration",
|
|
.data = &sysctl_timer_migration,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = timer_migration_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
{
|
|
.procname = "unprivileged_bpf_disabled",
|
|
.data = &sysctl_unprivileged_bpf_disabled,
|
|
.maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
|
|
.mode = 0644,
|
|
/* only handle a transition from default "0" to "1" */
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
|
|
{
|
|
.procname = "panic_on_rcu_stall",
|
|
.data = &sysctl_panic_on_rcu_stall,
|
|
.maxlen = sizeof(sysctl_panic_on_rcu_stall),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table vm_table[] = {
|
|
{
|
|
.procname = "overcommit_memory",
|
|
.data = &sysctl_overcommit_memory,
|
|
.maxlen = sizeof(sysctl_overcommit_memory),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &two,
|
|
},
|
|
{
|
|
.procname = "panic_on_oom",
|
|
.data = &sysctl_panic_on_oom,
|
|
.maxlen = sizeof(sysctl_panic_on_oom),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &two,
|
|
},
|
|
{
|
|
.procname = "oom_kill_allocating_task",
|
|
.data = &sysctl_oom_kill_allocating_task,
|
|
.maxlen = sizeof(sysctl_oom_kill_allocating_task),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "oom_dump_tasks",
|
|
.data = &sysctl_oom_dump_tasks,
|
|
.maxlen = sizeof(sysctl_oom_dump_tasks),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "overcommit_ratio",
|
|
.data = &sysctl_overcommit_ratio,
|
|
.maxlen = sizeof(sysctl_overcommit_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = overcommit_ratio_handler,
|
|
},
|
|
{
|
|
.procname = "overcommit_kbytes",
|
|
.data = &sysctl_overcommit_kbytes,
|
|
.maxlen = sizeof(sysctl_overcommit_kbytes),
|
|
.mode = 0644,
|
|
.proc_handler = overcommit_kbytes_handler,
|
|
},
|
|
{
|
|
.procname = "page-cluster",
|
|
.data = &page_cluster,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.procname = "dirty_background_ratio",
|
|
.data = &dirty_background_ratio,
|
|
.maxlen = sizeof(dirty_background_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = dirty_background_ratio_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
{
|
|
.procname = "dirty_background_bytes",
|
|
.data = &dirty_background_bytes,
|
|
.maxlen = sizeof(dirty_background_bytes),
|
|
.mode = 0644,
|
|
.proc_handler = dirty_background_bytes_handler,
|
|
.extra1 = &one_ul,
|
|
},
|
|
{
|
|
.procname = "dirty_ratio",
|
|
.data = &vm_dirty_ratio,
|
|
.maxlen = sizeof(vm_dirty_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = dirty_ratio_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
{
|
|
.procname = "dirty_bytes",
|
|
.data = &vm_dirty_bytes,
|
|
.maxlen = sizeof(vm_dirty_bytes),
|
|
.mode = 0644,
|
|
.proc_handler = dirty_bytes_handler,
|
|
.extra1 = &dirty_bytes_min,
|
|
},
|
|
{
|
|
.procname = "dirty_writeback_centisecs",
|
|
.data = &dirty_writeback_interval,
|
|
.maxlen = sizeof(dirty_writeback_interval),
|
|
.mode = 0644,
|
|
.proc_handler = dirty_writeback_centisecs_handler,
|
|
},
|
|
{
|
|
.procname = "dirty_expire_centisecs",
|
|
.data = &dirty_expire_interval,
|
|
.maxlen = sizeof(dirty_expire_interval),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.procname = "dirtytime_expire_seconds",
|
|
.data = &dirtytime_expire_interval,
|
|
.maxlen = sizeof(dirtytime_expire_interval),
|
|
.mode = 0644,
|
|
.proc_handler = dirtytime_interval_handler,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.procname = "swappiness",
|
|
.data = &vm_swappiness,
|
|
.maxlen = sizeof(vm_swappiness),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
{
|
|
.procname = "nr_hugepages",
|
|
.data = NULL,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = hugetlb_sysctl_handler,
|
|
},
|
|
#ifdef CONFIG_NUMA
|
|
{
|
|
.procname = "nr_hugepages_mempolicy",
|
|
.data = NULL,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = &hugetlb_mempolicy_sysctl_handler,
|
|
},
|
|
{
|
|
.procname = "numa_stat",
|
|
.data = &sysctl_vm_numa_stat,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = sysctl_vm_numa_stat_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "hugetlb_shm_group",
|
|
.data = &sysctl_hugetlb_shm_group,
|
|
.maxlen = sizeof(gid_t),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "nr_overcommit_hugepages",
|
|
.data = NULL,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = hugetlb_overcommit_handler,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "lowmem_reserve_ratio",
|
|
.data = &sysctl_lowmem_reserve_ratio,
|
|
.maxlen = sizeof(sysctl_lowmem_reserve_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = lowmem_reserve_ratio_sysctl_handler,
|
|
},
|
|
{
|
|
.procname = "drop_caches",
|
|
.data = &sysctl_drop_caches,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = drop_caches_sysctl_handler,
|
|
.extra1 = &one,
|
|
.extra2 = &four,
|
|
},
|
|
#ifdef CONFIG_COMPACTION
|
|
{
|
|
.procname = "compact_memory",
|
|
.data = &sysctl_compact_memory,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0200,
|
|
.proc_handler = sysctl_compaction_handler,
|
|
},
|
|
{
|
|
.procname = "extfrag_threshold",
|
|
.data = &sysctl_extfrag_threshold,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = sysctl_extfrag_handler,
|
|
.extra1 = &min_extfrag_threshold,
|
|
.extra2 = &max_extfrag_threshold,
|
|
},
|
|
{
|
|
.procname = "compact_unevictable_allowed",
|
|
.data = &sysctl_compact_unevictable_allowed,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
|
|
#endif /* CONFIG_COMPACTION */
|
|
{
|
|
.procname = "min_free_kbytes",
|
|
.data = &min_free_kbytes,
|
|
.maxlen = sizeof(min_free_kbytes),
|
|
.mode = 0644,
|
|
.proc_handler = min_free_kbytes_sysctl_handler,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.procname = "watermark_scale_factor",
|
|
.data = &watermark_scale_factor,
|
|
.maxlen = sizeof(watermark_scale_factor),
|
|
.mode = 0644,
|
|
.proc_handler = watermark_scale_factor_sysctl_handler,
|
|
.extra1 = &one,
|
|
.extra2 = &one_thousand,
|
|
},
|
|
{
|
|
.procname = "percpu_pagelist_fraction",
|
|
.data = &percpu_pagelist_fraction,
|
|
.maxlen = sizeof(percpu_pagelist_fraction),
|
|
.mode = 0644,
|
|
.proc_handler = percpu_pagelist_fraction_sysctl_handler,
|
|
.extra1 = &zero,
|
|
},
|
|
#ifdef CONFIG_MMU
|
|
{
|
|
.procname = "max_map_count",
|
|
.data = &sysctl_max_map_count,
|
|
.maxlen = sizeof(sysctl_max_map_count),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
},
|
|
#else
|
|
{
|
|
.procname = "nr_trim_pages",
|
|
.data = &sysctl_nr_trim_pages,
|
|
.maxlen = sizeof(sysctl_nr_trim_pages),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "laptop_mode",
|
|
.data = &laptop_mode,
|
|
.maxlen = sizeof(laptop_mode),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "block_dump",
|
|
.data = &block_dump,
|
|
.maxlen = sizeof(block_dump),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.procname = "vfs_cache_pressure",
|
|
.data = &sysctl_vfs_cache_pressure,
|
|
.maxlen = sizeof(sysctl_vfs_cache_pressure),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.extra1 = &zero,
|
|
},
|
|
#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
|
|
{
|
|
.procname = "legacy_va_layout",
|
|
.data = &sysctl_legacy_va_layout,
|
|
.maxlen = sizeof(sysctl_legacy_va_layout),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.extra1 = &zero,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
{
|
|
.procname = "zone_reclaim_mode",
|
|
.data = &node_reclaim_mode,
|
|
.maxlen = sizeof(node_reclaim_mode),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.extra1 = &zero,
|
|
},
|
|
{
|
|
.procname = "min_unmapped_ratio",
|
|
.data = &sysctl_min_unmapped_ratio,
|
|
.maxlen = sizeof(sysctl_min_unmapped_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
{
|
|
.procname = "min_slab_ratio",
|
|
.data = &sysctl_min_slab_ratio,
|
|
.maxlen = sizeof(sysctl_min_slab_ratio),
|
|
.mode = 0644,
|
|
.proc_handler = sysctl_min_slab_ratio_sysctl_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one_hundred,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_SMP
|
|
{
|
|
.procname = "stat_interval",
|
|
.data = &sysctl_stat_interval,
|
|
.maxlen = sizeof(sysctl_stat_interval),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "stat_refresh",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0600,
|
|
.proc_handler = vmstat_refresh,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_MMU
|
|
{
|
|
.procname = "mmap_min_addr",
|
|
.data = &dac_mmap_min_addr,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = mmap_min_addr_handler,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
{
|
|
.procname = "numa_zonelist_order",
|
|
.data = &numa_zonelist_order,
|
|
.maxlen = NUMA_ZONELIST_ORDER_LEN,
|
|
.mode = 0644,
|
|
.proc_handler = numa_zonelist_order_handler,
|
|
},
|
|
#endif
|
|
#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
|
|
(defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
|
|
{
|
|
.procname = "vdso_enabled",
|
|
#ifdef CONFIG_X86_32
|
|
.data = &vdso32_enabled,
|
|
.maxlen = sizeof(vdso32_enabled),
|
|
#else
|
|
.data = &vdso_enabled,
|
|
.maxlen = sizeof(vdso_enabled),
|
|
#endif
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
.extra1 = &zero,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_HIGHMEM
|
|
{
|
|
.procname = "highmem_is_dirtyable",
|
|
.data = &vm_highmem_is_dirtyable,
|
|
.maxlen = sizeof(vm_highmem_is_dirtyable),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
{
|
|
.procname = "memory_failure_early_kill",
|
|
.data = &sysctl_memory_failure_early_kill,
|
|
.maxlen = sizeof(sysctl_memory_failure_early_kill),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "memory_failure_recovery",
|
|
.data = &sysctl_memory_failure_recovery,
|
|
.maxlen = sizeof(sysctl_memory_failure_recovery),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "user_reserve_kbytes",
|
|
.data = &sysctl_user_reserve_kbytes,
|
|
.maxlen = sizeof(sysctl_user_reserve_kbytes),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "admin_reserve_kbytes",
|
|
.data = &sysctl_admin_reserve_kbytes,
|
|
.maxlen = sizeof(sysctl_admin_reserve_kbytes),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
|
|
{
|
|
.procname = "mmap_rnd_bits",
|
|
.data = &mmap_rnd_bits,
|
|
.maxlen = sizeof(mmap_rnd_bits),
|
|
.mode = 0600,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = (void *)&mmap_rnd_bits_min,
|
|
.extra2 = (void *)&mmap_rnd_bits_max,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
|
|
{
|
|
.procname = "mmap_rnd_compat_bits",
|
|
.data = &mmap_rnd_compat_bits,
|
|
.maxlen = sizeof(mmap_rnd_compat_bits),
|
|
.mode = 0600,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = (void *)&mmap_rnd_compat_bits_min,
|
|
.extra2 = (void *)&mmap_rnd_compat_bits_max,
|
|
},
|
|
#endif
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table fs_table[] = {
|
|
{
|
|
.procname = "inode-nr",
|
|
.data = &inodes_stat,
|
|
.maxlen = 2*sizeof(long),
|
|
.mode = 0444,
|
|
.proc_handler = proc_nr_inodes,
|
|
},
|
|
{
|
|
.procname = "inode-state",
|
|
.data = &inodes_stat,
|
|
.maxlen = 7*sizeof(long),
|
|
.mode = 0444,
|
|
.proc_handler = proc_nr_inodes,
|
|
},
|
|
{
|
|
.procname = "file-nr",
|
|
.data = &files_stat,
|
|
.maxlen = sizeof(files_stat),
|
|
.mode = 0444,
|
|
.proc_handler = proc_nr_files,
|
|
},
|
|
{
|
|
.procname = "file-max",
|
|
.data = &files_stat.max_files,
|
|
.maxlen = sizeof(files_stat.max_files),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "nr_open",
|
|
.data = &sysctl_nr_open,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &sysctl_nr_open_min,
|
|
.extra2 = &sysctl_nr_open_max,
|
|
},
|
|
{
|
|
.procname = "dentry-state",
|
|
.data = &dentry_stat,
|
|
.maxlen = 6*sizeof(long),
|
|
.mode = 0444,
|
|
.proc_handler = proc_nr_dentry,
|
|
},
|
|
{
|
|
.procname = "overflowuid",
|
|
.data = &fs_overflowuid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
{
|
|
.procname = "overflowgid",
|
|
.data = &fs_overflowgid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &minolduid,
|
|
.extra2 = &maxolduid,
|
|
},
|
|
#ifdef CONFIG_FILE_LOCKING
|
|
{
|
|
.procname = "leases-enable",
|
|
.data = &leases_enable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_DNOTIFY
|
|
{
|
|
.procname = "dir-notify-enable",
|
|
.data = &dir_notify_enable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_MMU
|
|
#ifdef CONFIG_FILE_LOCKING
|
|
{
|
|
.procname = "lease-break-time",
|
|
.data = &lease_break_time,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_AIO
|
|
{
|
|
.procname = "aio-nr",
|
|
.data = &aio_nr,
|
|
.maxlen = sizeof(aio_nr),
|
|
.mode = 0444,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "aio-max-nr",
|
|
.data = &aio_max_nr,
|
|
.maxlen = sizeof(aio_max_nr),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
#endif /* CONFIG_AIO */
|
|
#ifdef CONFIG_INOTIFY_USER
|
|
{
|
|
.procname = "inotify",
|
|
.mode = 0555,
|
|
.child = inotify_table,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_EPOLL
|
|
{
|
|
.procname = "epoll",
|
|
.mode = 0555,
|
|
.child = epoll_table,
|
|
},
|
|
#endif
|
|
#endif
|
|
{
|
|
.procname = "protected_symlinks",
|
|
.data = &sysctl_protected_symlinks,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0600,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "protected_hardlinks",
|
|
.data = &sysctl_protected_hardlinks,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0600,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "suid_dumpable",
|
|
.data = &suid_dumpable,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax_coredump,
|
|
.extra1 = &zero,
|
|
.extra2 = &two,
|
|
},
|
|
#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
|
|
{
|
|
.procname = "binfmt_misc",
|
|
.mode = 0555,
|
|
.child = sysctl_mount_point,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "pipe-max-size",
|
|
.data = &pipe_max_size,
|
|
.maxlen = sizeof(pipe_max_size),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dopipe_max_size,
|
|
},
|
|
{
|
|
.procname = "pipe-user-pages-hard",
|
|
.data = &pipe_user_pages_hard,
|
|
.maxlen = sizeof(pipe_user_pages_hard),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "pipe-user-pages-soft",
|
|
.data = &pipe_user_pages_soft,
|
|
.maxlen = sizeof(pipe_user_pages_soft),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "mount-max",
|
|
.data = &sysctl_mount_max,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table debug_table[] = {
|
|
#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
|
|
{
|
|
.procname = "exception-trace",
|
|
.data = &show_unhandled_signals,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_OPTPROBES)
|
|
{
|
|
.procname = "kprobes-optimization",
|
|
.data = &sysctl_kprobes_optimization,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_kprobes_optimization_handler,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
#endif
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table dev_table[] = {
|
|
{ }
|
|
};
|
|
|
|
int __init sysctl_init(void)
|
|
{
|
|
struct ctl_table_header *hdr;
|
|
|
|
hdr = register_sysctl_table(sysctl_base_table);
|
|
kmemleak_not_leak(hdr);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_SYSCTL */
|
|
|
|
/*
|
|
* /proc/sys support
|
|
*/
|
|
|
|
#ifdef CONFIG_PROC_SYSCTL
|
|
|
|
static int _proc_do_string(char *data, int maxlen, int write,
|
|
char __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
size_t len;
|
|
char __user *p;
|
|
char c;
|
|
|
|
if (!data || !maxlen || !*lenp) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (write) {
|
|
if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
|
|
/* Only continue writes not past the end of buffer. */
|
|
len = strlen(data);
|
|
if (len > maxlen - 1)
|
|
len = maxlen - 1;
|
|
|
|
if (*ppos > len)
|
|
return 0;
|
|
len = *ppos;
|
|
} else {
|
|
/* Start writing from beginning of buffer. */
|
|
len = 0;
|
|
}
|
|
|
|
*ppos += *lenp;
|
|
p = buffer;
|
|
while ((p - buffer) < *lenp && len < maxlen - 1) {
|
|
if (get_user(c, p++))
|
|
return -EFAULT;
|
|
if (c == 0 || c == '\n')
|
|
break;
|
|
data[len++] = c;
|
|
}
|
|
data[len] = 0;
|
|
} else {
|
|
len = strlen(data);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
if (*ppos > len) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
data += *ppos;
|
|
len -= *ppos;
|
|
|
|
if (len > *lenp)
|
|
len = *lenp;
|
|
if (len)
|
|
if (copy_to_user(buffer, data, len))
|
|
return -EFAULT;
|
|
if (len < *lenp) {
|
|
if (put_user('\n', buffer + len))
|
|
return -EFAULT;
|
|
len++;
|
|
}
|
|
*lenp = len;
|
|
*ppos += len;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void warn_sysctl_write(struct ctl_table *table)
|
|
{
|
|
pr_warn_once("%s wrote to %s when file position was not 0!\n"
|
|
"This will not be supported in the future. To silence this\n"
|
|
"warning, set kernel.sysctl_writes_strict = -1\n",
|
|
current->comm, table->procname);
|
|
}
|
|
|
|
/**
|
|
* proc_first_pos_non_zero_ignore - check if firs position is allowed
|
|
* @ppos: file position
|
|
* @table: the sysctl table
|
|
*
|
|
* Returns true if the first position is non-zero and the sysctl_writes_strict
|
|
* mode indicates this is not allowed for numeric input types. String proc
|
|
* hadlers can ignore the return value.
|
|
*/
|
|
static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
|
|
struct ctl_table *table)
|
|
{
|
|
if (!*ppos)
|
|
return false;
|
|
|
|
switch (sysctl_writes_strict) {
|
|
case SYSCTL_WRITES_STRICT:
|
|
return true;
|
|
case SYSCTL_WRITES_WARN:
|
|
warn_sysctl_write(table);
|
|
return false;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* proc_dostring - read a string sysctl
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes a string from/to the user buffer. If the kernel
|
|
* buffer provided is not large enough to hold the string, the
|
|
* string is truncated. The copied string is %NULL-terminated.
|
|
* If the string is being read by the user process, it is copied
|
|
* and a newline '\n' is added. It is truncated if the buffer is
|
|
* not large enough.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dostring(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
if (write)
|
|
proc_first_pos_non_zero_ignore(ppos, table);
|
|
|
|
return _proc_do_string((char *)(table->data), table->maxlen, write,
|
|
(char __user *)buffer, lenp, ppos);
|
|
}
|
|
|
|
static size_t proc_skip_spaces(char **buf)
|
|
{
|
|
size_t ret;
|
|
char *tmp = skip_spaces(*buf);
|
|
ret = tmp - *buf;
|
|
*buf = tmp;
|
|
return ret;
|
|
}
|
|
|
|
static void proc_skip_char(char **buf, size_t *size, const char v)
|
|
{
|
|
while (*size) {
|
|
if (**buf != v)
|
|
break;
|
|
(*size)--;
|
|
(*buf)++;
|
|
}
|
|
}
|
|
|
|
#define TMPBUFLEN 22
|
|
/**
|
|
* proc_get_long - reads an ASCII formatted integer from a user buffer
|
|
*
|
|
* @buf: a kernel buffer
|
|
* @size: size of the kernel buffer
|
|
* @val: this is where the number will be stored
|
|
* @neg: set to %TRUE if number is negative
|
|
* @perm_tr: a vector which contains the allowed trailers
|
|
* @perm_tr_len: size of the perm_tr vector
|
|
* @tr: pointer to store the trailer character
|
|
*
|
|
* In case of success %0 is returned and @buf and @size are updated with
|
|
* the amount of bytes read. If @tr is non-NULL and a trailing
|
|
* character exists (size is non-zero after returning from this
|
|
* function), @tr is updated with the trailing character.
|
|
*/
|
|
static int proc_get_long(char **buf, size_t *size,
|
|
unsigned long *val, bool *neg,
|
|
const char *perm_tr, unsigned perm_tr_len, char *tr)
|
|
{
|
|
int len;
|
|
char *p, tmp[TMPBUFLEN];
|
|
|
|
if (!*size)
|
|
return -EINVAL;
|
|
|
|
len = *size;
|
|
if (len > TMPBUFLEN - 1)
|
|
len = TMPBUFLEN - 1;
|
|
|
|
memcpy(tmp, *buf, len);
|
|
|
|
tmp[len] = 0;
|
|
p = tmp;
|
|
if (*p == '-' && *size > 1) {
|
|
*neg = true;
|
|
p++;
|
|
} else
|
|
*neg = false;
|
|
if (!isdigit(*p))
|
|
return -EINVAL;
|
|
|
|
*val = simple_strtoul(p, &p, 0);
|
|
|
|
len = p - tmp;
|
|
|
|
/* We don't know if the next char is whitespace thus we may accept
|
|
* invalid integers (e.g. 1234...a) or two integers instead of one
|
|
* (e.g. 123...1). So lets not allow such large numbers. */
|
|
if (len == TMPBUFLEN - 1)
|
|
return -EINVAL;
|
|
|
|
if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
|
|
return -EINVAL;
|
|
|
|
if (tr && (len < *size))
|
|
*tr = *p;
|
|
|
|
*buf += len;
|
|
*size -= len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proc_put_long - converts an integer to a decimal ASCII formatted string
|
|
*
|
|
* @buf: the user buffer
|
|
* @size: the size of the user buffer
|
|
* @val: the integer to be converted
|
|
* @neg: sign of the number, %TRUE for negative
|
|
*
|
|
* In case of success %0 is returned and @buf and @size are updated with
|
|
* the amount of bytes written.
|
|
*/
|
|
static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
|
|
bool neg)
|
|
{
|
|
int len;
|
|
char tmp[TMPBUFLEN], *p = tmp;
|
|
|
|
sprintf(p, "%s%lu", neg ? "-" : "", val);
|
|
len = strlen(tmp);
|
|
if (len > *size)
|
|
len = *size;
|
|
if (copy_to_user(*buf, tmp, len))
|
|
return -EFAULT;
|
|
*size -= len;
|
|
*buf += len;
|
|
return 0;
|
|
}
|
|
#undef TMPBUFLEN
|
|
|
|
static int proc_put_char(void __user **buf, size_t *size, char c)
|
|
{
|
|
if (*size) {
|
|
char __user **buffer = (char __user **)buf;
|
|
if (put_user(c, *buffer))
|
|
return -EFAULT;
|
|
(*size)--, (*buffer)++;
|
|
*buf = *buffer;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
if (*negp) {
|
|
if (*lvalp > (unsigned long) INT_MAX + 1)
|
|
return -EINVAL;
|
|
*valp = -*lvalp;
|
|
} else {
|
|
if (*lvalp > (unsigned long) INT_MAX)
|
|
return -EINVAL;
|
|
*valp = *lvalp;
|
|
}
|
|
} else {
|
|
int val = *valp;
|
|
if (val < 0) {
|
|
*negp = true;
|
|
*lvalp = -(unsigned long)val;
|
|
} else {
|
|
*negp = false;
|
|
*lvalp = (unsigned long)val;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_proc_douintvec_conv(unsigned long *lvalp,
|
|
unsigned int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
if (*lvalp > UINT_MAX)
|
|
return -EINVAL;
|
|
*valp = *lvalp;
|
|
} else {
|
|
unsigned int val = *valp;
|
|
*lvalp = (unsigned long)val;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
|
|
|
|
static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
|
|
int write, void __user *buffer,
|
|
size_t *lenp, loff_t *ppos,
|
|
int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
|
|
int write, void *data),
|
|
void *data)
|
|
{
|
|
int *i, vleft, first = 1, err = 0;
|
|
size_t left;
|
|
char *kbuf = NULL, *p;
|
|
|
|
if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
i = (int *) tbl_data;
|
|
vleft = table->maxlen / sizeof(*i);
|
|
left = *lenp;
|
|
|
|
if (!conv)
|
|
conv = do_proc_dointvec_conv;
|
|
|
|
if (write) {
|
|
if (proc_first_pos_non_zero_ignore(ppos, table))
|
|
goto out;
|
|
|
|
if (left > PAGE_SIZE - 1)
|
|
left = PAGE_SIZE - 1;
|
|
p = kbuf = memdup_user_nul(buffer, left);
|
|
if (IS_ERR(kbuf))
|
|
return PTR_ERR(kbuf);
|
|
}
|
|
|
|
for (; left && vleft--; i++, first=0) {
|
|
unsigned long lval;
|
|
bool neg;
|
|
|
|
if (write) {
|
|
left -= proc_skip_spaces(&p);
|
|
|
|
if (!left)
|
|
break;
|
|
err = proc_get_long(&p, &left, &lval, &neg,
|
|
proc_wspace_sep,
|
|
sizeof(proc_wspace_sep), NULL);
|
|
if (err)
|
|
break;
|
|
if (conv(&neg, &lval, i, 1, data)) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
} else {
|
|
if (conv(&neg, &lval, i, 0, data)) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
if (!first)
|
|
err = proc_put_char(&buffer, &left, '\t');
|
|
if (err)
|
|
break;
|
|
err = proc_put_long(&buffer, &left, lval, neg);
|
|
if (err)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!write && !first && left && !err)
|
|
err = proc_put_char(&buffer, &left, '\n');
|
|
if (write && !err && left)
|
|
left -= proc_skip_spaces(&p);
|
|
if (write) {
|
|
kfree(kbuf);
|
|
if (first)
|
|
return err ? : -EINVAL;
|
|
}
|
|
*lenp -= left;
|
|
out:
|
|
*ppos += *lenp;
|
|
return err;
|
|
}
|
|
|
|
static int do_proc_dointvec(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos,
|
|
int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
|
|
int write, void *data),
|
|
void *data)
|
|
{
|
|
return __do_proc_dointvec(table->data, table, write,
|
|
buffer, lenp, ppos, conv, data);
|
|
}
|
|
|
|
static int do_proc_douintvec_w(unsigned int *tbl_data,
|
|
struct ctl_table *table,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos,
|
|
int (*conv)(unsigned long *lvalp,
|
|
unsigned int *valp,
|
|
int write, void *data),
|
|
void *data)
|
|
{
|
|
unsigned long lval;
|
|
int err = 0;
|
|
size_t left;
|
|
bool neg;
|
|
char *kbuf = NULL, *p;
|
|
|
|
left = *lenp;
|
|
|
|
if (proc_first_pos_non_zero_ignore(ppos, table))
|
|
goto bail_early;
|
|
|
|
if (left > PAGE_SIZE - 1)
|
|
left = PAGE_SIZE - 1;
|
|
|
|
p = kbuf = memdup_user_nul(buffer, left);
|
|
if (IS_ERR(kbuf))
|
|
return -EINVAL;
|
|
|
|
left -= proc_skip_spaces(&p);
|
|
if (!left) {
|
|
err = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
err = proc_get_long(&p, &left, &lval, &neg,
|
|
proc_wspace_sep,
|
|
sizeof(proc_wspace_sep), NULL);
|
|
if (err || neg) {
|
|
err = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
if (conv(&lval, tbl_data, 1, data)) {
|
|
err = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
if (!err && left)
|
|
left -= proc_skip_spaces(&p);
|
|
|
|
out_free:
|
|
kfree(kbuf);
|
|
if (err)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
|
|
/* This is in keeping with old __do_proc_dointvec() */
|
|
bail_early:
|
|
*ppos += *lenp;
|
|
return err;
|
|
}
|
|
|
|
static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
|
|
size_t *lenp, loff_t *ppos,
|
|
int (*conv)(unsigned long *lvalp,
|
|
unsigned int *valp,
|
|
int write, void *data),
|
|
void *data)
|
|
{
|
|
unsigned long lval;
|
|
int err = 0;
|
|
size_t left;
|
|
|
|
left = *lenp;
|
|
|
|
if (conv(&lval, tbl_data, 0, data)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
err = proc_put_long(&buffer, &left, lval, false);
|
|
if (err || !left)
|
|
goto out;
|
|
|
|
err = proc_put_char(&buffer, &left, '\n');
|
|
|
|
out:
|
|
*lenp -= left;
|
|
*ppos += *lenp;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
|
|
int write, void __user *buffer,
|
|
size_t *lenp, loff_t *ppos,
|
|
int (*conv)(unsigned long *lvalp,
|
|
unsigned int *valp,
|
|
int write, void *data),
|
|
void *data)
|
|
{
|
|
unsigned int *i, vleft;
|
|
|
|
if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
i = (unsigned int *) tbl_data;
|
|
vleft = table->maxlen / sizeof(*i);
|
|
|
|
/*
|
|
* Arrays are not supported, keep this simple. *Do not* add
|
|
* support for them.
|
|
*/
|
|
if (vleft != 1) {
|
|
*lenp = 0;
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!conv)
|
|
conv = do_proc_douintvec_conv;
|
|
|
|
if (write)
|
|
return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
|
|
conv, data);
|
|
return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
|
|
}
|
|
|
|
static int do_proc_douintvec(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos,
|
|
int (*conv)(unsigned long *lvalp,
|
|
unsigned int *valp,
|
|
int write, void *data),
|
|
void *data)
|
|
{
|
|
return __do_proc_douintvec(table->data, table, write,
|
|
buffer, lenp, ppos, conv, data);
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec - read a vector of integers
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
|
|
}
|
|
|
|
/**
|
|
* proc_douintvec - read a vector of unsigned integers
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_douintvec(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_douintvec(table, write, buffer, lenp, ppos,
|
|
do_proc_douintvec_conv, NULL);
|
|
}
|
|
|
|
/*
|
|
* Taint values can only be increased
|
|
* This means we can safely use a temporary.
|
|
*/
|
|
static int proc_taint(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct ctl_table t;
|
|
unsigned long tmptaint = get_taint();
|
|
int err;
|
|
|
|
if (write && !capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
t = *table;
|
|
t.data = &tmptaint;
|
|
err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (write) {
|
|
/*
|
|
* Poor man's atomic or. Not worth adding a primitive
|
|
* to everyone's atomic.h for this
|
|
*/
|
|
int i;
|
|
for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
|
|
if ((tmptaint >> i) & 1)
|
|
add_taint(i, LOCKDEP_STILL_OK);
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
if (write && !capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
|
|
* @min: pointer to minimum allowable value
|
|
* @max: pointer to maximum allowable value
|
|
*
|
|
* The do_proc_dointvec_minmax_conv_param structure provides the
|
|
* minimum and maximum values for doing range checking for those sysctl
|
|
* parameters that use the proc_dointvec_minmax() handler.
|
|
*/
|
|
struct do_proc_dointvec_minmax_conv_param {
|
|
int *min;
|
|
int *max;
|
|
};
|
|
|
|
static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
struct do_proc_dointvec_minmax_conv_param *param = data;
|
|
if (write) {
|
|
int val = *negp ? -*lvalp : *lvalp;
|
|
if ((param->min && *param->min > val) ||
|
|
(param->max && *param->max < val))
|
|
return -EINVAL;
|
|
*valp = val;
|
|
} else {
|
|
int val = *valp;
|
|
if (val < 0) {
|
|
*negp = true;
|
|
*lvalp = -(unsigned long)val;
|
|
} else {
|
|
*negp = false;
|
|
*lvalp = (unsigned long)val;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_minmax - read a vector of integers with min/max values
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
*
|
|
* This routine will ensure the values are within the range specified by
|
|
* table->extra1 (min) and table->extra2 (max).
|
|
*
|
|
* Returns 0 on success or -EINVAL on write when the range check fails.
|
|
*/
|
|
int proc_dointvec_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct do_proc_dointvec_minmax_conv_param param = {
|
|
.min = (int *) table->extra1,
|
|
.max = (int *) table->extra2,
|
|
};
|
|
return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
|
do_proc_dointvec_minmax_conv, ¶m);
|
|
}
|
|
|
|
/**
|
|
* struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
|
|
* @min: pointer to minimum allowable value
|
|
* @max: pointer to maximum allowable value
|
|
*
|
|
* The do_proc_douintvec_minmax_conv_param structure provides the
|
|
* minimum and maximum values for doing range checking for those sysctl
|
|
* parameters that use the proc_douintvec_minmax() handler.
|
|
*/
|
|
struct do_proc_douintvec_minmax_conv_param {
|
|
unsigned int *min;
|
|
unsigned int *max;
|
|
};
|
|
|
|
static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
|
|
unsigned int *valp,
|
|
int write, void *data)
|
|
{
|
|
struct do_proc_douintvec_minmax_conv_param *param = data;
|
|
|
|
if (write) {
|
|
unsigned int val = *lvalp;
|
|
|
|
if (*lvalp > UINT_MAX)
|
|
return -EINVAL;
|
|
|
|
if ((param->min && *param->min > val) ||
|
|
(param->max && *param->max < val))
|
|
return -ERANGE;
|
|
|
|
*valp = val;
|
|
} else {
|
|
unsigned int val = *valp;
|
|
*lvalp = (unsigned long) val;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proc_douintvec_minmax - read a vector of unsigned ints with min/max values
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
|
|
* values from/to the user buffer, treated as an ASCII string. Negative
|
|
* strings are not allowed.
|
|
*
|
|
* This routine will ensure the values are within the range specified by
|
|
* table->extra1 (min) and table->extra2 (max). There is a final sanity
|
|
* check for UINT_MAX to avoid having to support wrap around uses from
|
|
* userspace.
|
|
*
|
|
* Returns 0 on success or -ERANGE on write when the range check fails.
|
|
*/
|
|
int proc_douintvec_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct do_proc_douintvec_minmax_conv_param param = {
|
|
.min = (unsigned int *) table->extra1,
|
|
.max = (unsigned int *) table->extra2,
|
|
};
|
|
return do_proc_douintvec(table, write, buffer, lenp, ppos,
|
|
do_proc_douintvec_minmax_conv, ¶m);
|
|
}
|
|
|
|
static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
|
|
unsigned int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
unsigned int val;
|
|
|
|
val = round_pipe_size(*lvalp);
|
|
if (val == 0)
|
|
return -EINVAL;
|
|
|
|
*valp = val;
|
|
} else {
|
|
unsigned int val = *valp;
|
|
*lvalp = (unsigned long) val;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int proc_dopipe_max_size(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_douintvec(table, write, buffer, lenp, ppos,
|
|
do_proc_dopipe_max_size_conv, NULL);
|
|
}
|
|
|
|
static void validate_coredump_safety(void)
|
|
{
|
|
#ifdef CONFIG_COREDUMP
|
|
if (suid_dumpable == SUID_DUMP_ROOT &&
|
|
core_pattern[0] != '/' && core_pattern[0] != '|') {
|
|
printk(KERN_WARNING
|
|
"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
|
|
"Pipe handler or fully qualified core dump path required.\n"
|
|
"Set kernel.core_pattern before fs.suid_dumpable.\n"
|
|
);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
|
if (!error)
|
|
validate_coredump_safety();
|
|
return error;
|
|
}
|
|
|
|
#ifdef CONFIG_COREDUMP
|
|
static int proc_dostring_coredump(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int error = proc_dostring(table, write, buffer, lenp, ppos);
|
|
if (!error)
|
|
validate_coredump_safety();
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos,
|
|
unsigned long convmul,
|
|
unsigned long convdiv)
|
|
{
|
|
unsigned long *i, *min, *max;
|
|
int vleft, first = 1, err = 0;
|
|
size_t left;
|
|
char *kbuf = NULL, *p;
|
|
|
|
if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
i = (unsigned long *) data;
|
|
min = (unsigned long *) table->extra1;
|
|
max = (unsigned long *) table->extra2;
|
|
vleft = table->maxlen / sizeof(unsigned long);
|
|
left = *lenp;
|
|
|
|
if (write) {
|
|
if (proc_first_pos_non_zero_ignore(ppos, table))
|
|
goto out;
|
|
|
|
if (left > PAGE_SIZE - 1)
|
|
left = PAGE_SIZE - 1;
|
|
p = kbuf = memdup_user_nul(buffer, left);
|
|
if (IS_ERR(kbuf))
|
|
return PTR_ERR(kbuf);
|
|
}
|
|
|
|
for (; left && vleft--; i++, first = 0) {
|
|
unsigned long val;
|
|
|
|
if (write) {
|
|
bool neg;
|
|
|
|
left -= proc_skip_spaces(&p);
|
|
|
|
err = proc_get_long(&p, &left, &val, &neg,
|
|
proc_wspace_sep,
|
|
sizeof(proc_wspace_sep), NULL);
|
|
if (err)
|
|
break;
|
|
if (neg)
|
|
continue;
|
|
val = convmul * val / convdiv;
|
|
if ((min && val < *min) || (max && val > *max))
|
|
continue;
|
|
*i = val;
|
|
} else {
|
|
val = convdiv * (*i) / convmul;
|
|
if (!first) {
|
|
err = proc_put_char(&buffer, &left, '\t');
|
|
if (err)
|
|
break;
|
|
}
|
|
err = proc_put_long(&buffer, &left, val, false);
|
|
if (err)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!write && !first && left && !err)
|
|
err = proc_put_char(&buffer, &left, '\n');
|
|
if (write && !err)
|
|
left -= proc_skip_spaces(&p);
|
|
if (write) {
|
|
kfree(kbuf);
|
|
if (first)
|
|
return err ? : -EINVAL;
|
|
}
|
|
*lenp -= left;
|
|
out:
|
|
*ppos += *lenp;
|
|
return err;
|
|
}
|
|
|
|
static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos,
|
|
unsigned long convmul,
|
|
unsigned long convdiv)
|
|
{
|
|
return __do_proc_doulongvec_minmax(table->data, table, write,
|
|
buffer, lenp, ppos, convmul, convdiv);
|
|
}
|
|
|
|
/**
|
|
* proc_doulongvec_minmax - read a vector of long integers with min/max values
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
*
|
|
* This routine will ensure the values are within the range specified by
|
|
* table->extra1 (min) and table->extra2 (max).
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_doulongvec_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
|
|
}
|
|
|
|
/**
|
|
* proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
|
|
* values from/to the user buffer, treated as an ASCII string. The values
|
|
* are treated as milliseconds, and converted to jiffies when they are stored.
|
|
*
|
|
* This routine will ensure the values are within the range specified by
|
|
* table->extra1 (min) and table->extra2 (max).
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_doulongvec_minmax(table, write, buffer,
|
|
lenp, ppos, HZ, 1000l);
|
|
}
|
|
|
|
|
|
static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
if (*lvalp > INT_MAX / HZ)
|
|
return 1;
|
|
*valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
|
|
} else {
|
|
int val = *valp;
|
|
unsigned long lval;
|
|
if (val < 0) {
|
|
*negp = true;
|
|
lval = -(unsigned long)val;
|
|
} else {
|
|
*negp = false;
|
|
lval = (unsigned long)val;
|
|
}
|
|
*lvalp = lval / HZ;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
|
|
return 1;
|
|
*valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
|
|
} else {
|
|
int val = *valp;
|
|
unsigned long lval;
|
|
if (val < 0) {
|
|
*negp = true;
|
|
lval = -(unsigned long)val;
|
|
} else {
|
|
*negp = false;
|
|
lval = (unsigned long)val;
|
|
}
|
|
*lvalp = jiffies_to_clock_t(lval);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
|
|
int *valp,
|
|
int write, void *data)
|
|
{
|
|
if (write) {
|
|
unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
|
|
|
|
if (jif > INT_MAX)
|
|
return 1;
|
|
*valp = (int)jif;
|
|
} else {
|
|
int val = *valp;
|
|
unsigned long lval;
|
|
if (val < 0) {
|
|
*negp = true;
|
|
lval = -(unsigned long)val;
|
|
} else {
|
|
*negp = false;
|
|
lval = (unsigned long)val;
|
|
}
|
|
*lvalp = jiffies_to_msecs(lval);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_jiffies - read a vector of integers as seconds
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
* The values read are assumed to be in seconds, and are converted into
|
|
* jiffies.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec_jiffies(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table,write,buffer,lenp,ppos,
|
|
do_proc_dointvec_jiffies_conv,NULL);
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: pointer to the file position
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
* The values read are assumed to be in 1/USER_HZ seconds, and
|
|
* are converted into jiffies.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table,write,buffer,lenp,ppos,
|
|
do_proc_dointvec_userhz_jiffies_conv,NULL);
|
|
}
|
|
|
|
/**
|
|
* proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
* @ppos: the current position in the file
|
|
*
|
|
* Reads/writes up to table->maxlen/sizeof(unsigned int) integer
|
|
* values from/to the user buffer, treated as an ASCII string.
|
|
* The values read are assumed to be in 1/1000 seconds, and
|
|
* are converted into jiffies.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
|
do_proc_dointvec_ms_jiffies_conv, NULL);
|
|
}
|
|
|
|
static int proc_do_cad_pid(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct pid *new_pid;
|
|
pid_t tmp;
|
|
int r;
|
|
|
|
tmp = pid_vnr(cad_pid);
|
|
|
|
r = __do_proc_dointvec(&tmp, table, write, buffer,
|
|
lenp, ppos, NULL, NULL);
|
|
if (r || !write)
|
|
return r;
|
|
|
|
new_pid = find_get_pid(tmp);
|
|
if (!new_pid)
|
|
return -ESRCH;
|
|
|
|
put_pid(xchg(&cad_pid, new_pid));
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proc_do_large_bitmap - read/write from/to a large bitmap
|
|
* @table: the sysctl table
|
|
* @write: %TRUE if this is a write to the sysctl file
|
|
* @buffer: the user buffer
|
|
* @lenp: the size of the user buffer
|
|
* @ppos: file position
|
|
*
|
|
* The bitmap is stored at table->data and the bitmap length (in bits)
|
|
* in table->maxlen.
|
|
*
|
|
* We use a range comma separated format (e.g. 1,3-4,10-10) so that
|
|
* large bitmaps may be represented in a compact manner. Writing into
|
|
* the file will clear the bitmap then update it with the given input.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
int proc_do_large_bitmap(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int err = 0;
|
|
bool first = 1;
|
|
size_t left = *lenp;
|
|
unsigned long bitmap_len = table->maxlen;
|
|
unsigned long *bitmap = *(unsigned long **) table->data;
|
|
unsigned long *tmp_bitmap = NULL;
|
|
char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
|
|
|
|
if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
|
|
*lenp = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (write) {
|
|
char *kbuf, *p;
|
|
|
|
if (left > PAGE_SIZE - 1)
|
|
left = PAGE_SIZE - 1;
|
|
|
|
p = kbuf = memdup_user_nul(buffer, left);
|
|
if (IS_ERR(kbuf))
|
|
return PTR_ERR(kbuf);
|
|
|
|
tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
|
|
GFP_KERNEL);
|
|
if (!tmp_bitmap) {
|
|
kfree(kbuf);
|
|
return -ENOMEM;
|
|
}
|
|
proc_skip_char(&p, &left, '\n');
|
|
while (!err && left) {
|
|
unsigned long val_a, val_b;
|
|
bool neg;
|
|
|
|
err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
|
|
sizeof(tr_a), &c);
|
|
if (err)
|
|
break;
|
|
if (val_a >= bitmap_len || neg) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
val_b = val_a;
|
|
if (left) {
|
|
p++;
|
|
left--;
|
|
}
|
|
|
|
if (c == '-') {
|
|
err = proc_get_long(&p, &left, &val_b,
|
|
&neg, tr_b, sizeof(tr_b),
|
|
&c);
|
|
if (err)
|
|
break;
|
|
if (val_b >= bitmap_len || neg ||
|
|
val_a > val_b) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
if (left) {
|
|
p++;
|
|
left--;
|
|
}
|
|
}
|
|
|
|
bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
|
|
first = 0;
|
|
proc_skip_char(&p, &left, '\n');
|
|
}
|
|
kfree(kbuf);
|
|
} else {
|
|
unsigned long bit_a, bit_b = 0;
|
|
|
|
while (left) {
|
|
bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
|
|
if (bit_a >= bitmap_len)
|
|
break;
|
|
bit_b = find_next_zero_bit(bitmap, bitmap_len,
|
|
bit_a + 1) - 1;
|
|
|
|
if (!first) {
|
|
err = proc_put_char(&buffer, &left, ',');
|
|
if (err)
|
|
break;
|
|
}
|
|
err = proc_put_long(&buffer, &left, bit_a, false);
|
|
if (err)
|
|
break;
|
|
if (bit_a != bit_b) {
|
|
err = proc_put_char(&buffer, &left, '-');
|
|
if (err)
|
|
break;
|
|
err = proc_put_long(&buffer, &left, bit_b, false);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
first = 0; bit_b++;
|
|
}
|
|
if (!err)
|
|
err = proc_put_char(&buffer, &left, '\n');
|
|
}
|
|
|
|
if (!err) {
|
|
if (write) {
|
|
if (*ppos)
|
|
bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
|
|
else
|
|
bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
|
|
}
|
|
*lenp -= left;
|
|
*ppos += *lenp;
|
|
}
|
|
|
|
kfree(tmp_bitmap);
|
|
return err;
|
|
}
|
|
|
|
#else /* CONFIG_PROC_SYSCTL */
|
|
|
|
int proc_dostring(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_douintvec(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_douintvec_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_jiffies(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
|
|
void __user *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
|
|
#endif /* CONFIG_PROC_SYSCTL */
|
|
|
|
/*
|
|
* No sense putting this after each symbol definition, twice,
|
|
* exception granted :-)
|
|
*/
|
|
EXPORT_SYMBOL(proc_dointvec);
|
|
EXPORT_SYMBOL(proc_douintvec);
|
|
EXPORT_SYMBOL(proc_dointvec_jiffies);
|
|
EXPORT_SYMBOL(proc_dointvec_minmax);
|
|
EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
|
|
EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
|
|
EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
|
|
EXPORT_SYMBOL(proc_dostring);
|
|
EXPORT_SYMBOL(proc_doulongvec_minmax);
|
|
EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
|