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e877820877
A sysctl variable is accessed concurrently, and there is always a chance
of data-race. So, all readers and writers need some basic protection to
avoid load/store-tearing.
This patch changes proc_dointvec_jiffies() to use READ_ONCE() and
WRITE_ONCE() internally to fix data-races on the sysctl side. For now,
proc_dointvec_jiffies() itself is tolerant to a data-race, but we still
need to add annotations on the other subsystem's side.
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2466 lines
58 KiB
C
2466 lines
58 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* sysctl.c: General linux system control interface
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*
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* Begun 24 March 1995, Stephen Tweedie
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* Added /proc support, Dec 1995
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* Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
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* Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
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* Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
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* Dynamic registration fixes, Stephen Tweedie.
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* Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
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* Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
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* Horn.
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* Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
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* Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
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* Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
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* Wendling.
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* The list_for_each() macro wasn't appropriate for the sysctl loop.
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* Removed it and replaced it with older style, 03/23/00, Bill Wendling
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/bitmap.h>
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#include <linux/signal.h>
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#include <linux/panic.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/filter.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/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/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/mount.h>
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#include <linux/userfaultfd_k.h>
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#include <linux/pid.h>
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#include "../lib/kstrtox.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_RT_MUTEXES
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#include <linux/rtmutex.h>
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#endif
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#if defined(CONFIG_SYSCTL)
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/* Constants used for minimum and maximum */
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#ifdef CONFIG_PERF_EVENTS
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static const int six_hundred_forty_kb = 640 * 1024;
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#endif
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static const int ngroups_max = NGROUPS_MAX;
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static const int cap_last_cap = CAP_LAST_CAP;
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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 length 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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#endif /* CONFIG_PROC_SYSCTL */
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#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
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defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
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int sysctl_legacy_va_layout;
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#endif
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#ifdef CONFIG_COMPACTION
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/* min_extfrag_threshold is SYSCTL_ZERO */;
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static const int max_extfrag_threshold = 1000;
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#endif
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#endif /* CONFIG_SYSCTL */
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/*
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* /proc/sys support
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*/
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#ifdef CONFIG_PROC_SYSCTL
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static int _proc_do_string(char *data, int maxlen, int write,
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char *buffer, size_t *lenp, loff_t *ppos)
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{
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size_t len;
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char c, *p;
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if (!data || !maxlen || !*lenp) {
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*lenp = 0;
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return 0;
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}
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if (write) {
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if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
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/* Only continue writes not past the end of buffer. */
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len = strlen(data);
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if (len > maxlen - 1)
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len = maxlen - 1;
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if (*ppos > len)
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return 0;
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len = *ppos;
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} else {
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/* Start writing from beginning of buffer. */
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len = 0;
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}
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*ppos += *lenp;
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p = buffer;
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while ((p - buffer) < *lenp && len < maxlen - 1) {
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c = *(p++);
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if (c == 0 || c == '\n')
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break;
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data[len++] = c;
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}
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data[len] = 0;
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} else {
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len = strlen(data);
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if (len > maxlen)
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len = maxlen;
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if (*ppos > len) {
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*lenp = 0;
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return 0;
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}
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data += *ppos;
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len -= *ppos;
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if (len > *lenp)
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len = *lenp;
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if (len)
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memcpy(buffer, data, len);
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if (len < *lenp) {
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buffer[len] = '\n';
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len++;
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}
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*lenp = len;
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*ppos += len;
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}
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return 0;
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}
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static void warn_sysctl_write(struct ctl_table *table)
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{
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pr_warn_once("%s wrote to %s when file position was not 0!\n"
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"This will not be supported in the future. To silence this\n"
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"warning, set kernel.sysctl_writes_strict = -1\n",
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current->comm, table->procname);
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}
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/**
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* proc_first_pos_non_zero_ignore - check if first position is allowed
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* @ppos: file position
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* @table: the sysctl table
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*
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* Returns true if the first position is non-zero and the sysctl_writes_strict
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* mode indicates this is not allowed for numeric input types. String proc
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* handlers can ignore the return value.
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*/
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static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
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struct ctl_table *table)
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{
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if (!*ppos)
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return false;
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switch (sysctl_writes_strict) {
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case SYSCTL_WRITES_STRICT:
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return true;
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case SYSCTL_WRITES_WARN:
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warn_sysctl_write(table);
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return false;
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default:
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return false;
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}
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}
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/**
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* proc_dostring - read a string sysctl
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* @table: the sysctl table
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* @write: %TRUE if this is a write to the sysctl file
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* @buffer: the user buffer
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* @lenp: the size of the user buffer
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* @ppos: file position
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*
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* Reads/writes a string from/to the user buffer. If the kernel
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* buffer provided is not large enough to hold the string, the
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* string is truncated. The copied string is %NULL-terminated.
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* If the string is being read by the user process, it is copied
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* and a newline '\n' is added. It is truncated if the buffer is
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* not large enough.
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*
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* Returns 0 on success.
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*/
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int proc_dostring(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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if (write)
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proc_first_pos_non_zero_ignore(ppos, table);
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return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
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ppos);
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}
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static size_t proc_skip_spaces(char **buf)
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{
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size_t ret;
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char *tmp = skip_spaces(*buf);
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ret = tmp - *buf;
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*buf = tmp;
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return ret;
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}
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static void proc_skip_char(char **buf, size_t *size, const char v)
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{
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while (*size) {
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if (**buf != v)
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break;
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(*size)--;
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(*buf)++;
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}
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}
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/**
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* strtoul_lenient - parse an ASCII formatted integer from a buffer and only
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* fail on overflow
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*
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* @cp: kernel buffer containing the string to parse
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* @endp: pointer to store the trailing characters
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* @base: the base to use
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* @res: where the parsed integer will be stored
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*
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* In case of success 0 is returned and @res will contain the parsed integer,
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* @endp will hold any trailing characters.
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* This function will fail the parse on overflow. If there wasn't an overflow
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* the function will defer the decision what characters count as invalid to the
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* caller.
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*/
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static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
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unsigned long *res)
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{
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unsigned long long result;
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unsigned int rv;
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cp = _parse_integer_fixup_radix(cp, &base);
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rv = _parse_integer(cp, base, &result);
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if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
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return -ERANGE;
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cp += rv;
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if (endp)
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*endp = (char *)cp;
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*res = (unsigned long)result;
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return 0;
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}
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#define TMPBUFLEN 22
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/**
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* proc_get_long - reads an ASCII formatted integer from a user buffer
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*
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* @buf: a kernel buffer
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* @size: size of the kernel buffer
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* @val: this is where the number will be stored
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* @neg: set to %TRUE if number is negative
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* @perm_tr: a vector which contains the allowed trailers
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* @perm_tr_len: size of the perm_tr vector
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* @tr: pointer to store the trailer character
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*
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* In case of success %0 is returned and @buf and @size are updated with
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* the amount of bytes read. If @tr is non-NULL and a trailing
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* character exists (size is non-zero after returning from this
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* function), @tr is updated with the trailing character.
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*/
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static int proc_get_long(char **buf, size_t *size,
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unsigned long *val, bool *neg,
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const char *perm_tr, unsigned perm_tr_len, char *tr)
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{
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int len;
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char *p, tmp[TMPBUFLEN];
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if (!*size)
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return -EINVAL;
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len = *size;
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if (len > TMPBUFLEN - 1)
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len = TMPBUFLEN - 1;
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memcpy(tmp, *buf, len);
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tmp[len] = 0;
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p = tmp;
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if (*p == '-' && *size > 1) {
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*neg = true;
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p++;
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} else
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*neg = false;
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if (!isdigit(*p))
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return -EINVAL;
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if (strtoul_lenient(p, &p, 0, val))
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return -EINVAL;
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len = p - tmp;
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/* We don't know if the next char is whitespace thus we may accept
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* invalid integers (e.g. 1234...a) or two integers instead of one
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* (e.g. 123...1). So lets not allow such large numbers. */
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if (len == TMPBUFLEN - 1)
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return -EINVAL;
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if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
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return -EINVAL;
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if (tr && (len < *size))
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*tr = *p;
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*buf += len;
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*size -= len;
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return 0;
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}
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/**
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* proc_put_long - converts an integer to a decimal ASCII formatted string
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*
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* @buf: the user buffer
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* @size: the size of the user buffer
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* @val: the integer to be converted
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* @neg: sign of the number, %TRUE for negative
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*
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* In case of success @buf and @size are updated with the amount of bytes
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* written.
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*/
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static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
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{
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int len;
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char tmp[TMPBUFLEN], *p = tmp;
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sprintf(p, "%s%lu", neg ? "-" : "", val);
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len = strlen(tmp);
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if (len > *size)
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len = *size;
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memcpy(*buf, tmp, len);
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*size -= len;
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*buf += len;
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}
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#undef TMPBUFLEN
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static void proc_put_char(void **buf, size_t *size, char c)
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{
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if (*size) {
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char **buffer = (char **)buf;
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**buffer = c;
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(*size)--;
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(*buffer)++;
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*buf = *buffer;
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}
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}
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static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp,
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int *valp,
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int write, void *data)
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{
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if (write) {
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*(bool *)valp = *lvalp;
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} else {
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int val = *(bool *)valp;
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*lvalp = (unsigned long)val;
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*negp = false;
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}
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return 0;
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}
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|
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static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
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int *valp,
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int write, void *data)
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{
|
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if (write) {
|
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if (*negp) {
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|
if (*lvalp > (unsigned long) INT_MAX + 1)
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return -EINVAL;
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WRITE_ONCE(*valp, -*lvalp);
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} else {
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if (*lvalp > (unsigned long) INT_MAX)
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return -EINVAL;
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WRITE_ONCE(*valp, *lvalp);
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}
|
|
} else {
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int val = READ_ONCE(*valp);
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if (val < 0) {
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*negp = true;
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*lvalp = -(unsigned long)val;
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} else {
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*negp = false;
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*lvalp = (unsigned long)val;
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}
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}
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return 0;
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}
|
|
|
|
static int do_proc_douintvec_conv(unsigned long *lvalp,
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unsigned int *valp,
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int write, void *data)
|
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{
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|
if (write) {
|
|
if (*lvalp > UINT_MAX)
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return -EINVAL;
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WRITE_ONCE(*valp, *lvalp);
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|
} else {
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unsigned int val = READ_ONCE(*valp);
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|
*lvalp = (unsigned long)val;
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|
}
|
|
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 *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 *p;
|
|
|
|
if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
|
|
*lenp = 0;
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|
return 0;
|
|
}
|
|
|
|
i = (int *) tbl_data;
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|
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 = buffer;
|
|
}
|
|
|
|
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)
|
|
proc_put_char(&buffer, &left, '\t');
|
|
proc_put_long(&buffer, &left, lval, neg);
|
|
}
|
|
}
|
|
|
|
if (!write && !first && left && !err)
|
|
proc_put_char(&buffer, &left, '\n');
|
|
if (write && !err && left)
|
|
left -= proc_skip_spaces(&p);
|
|
if (write && first)
|
|
return err ? : -EINVAL;
|
|
*lenp -= left;
|
|
out:
|
|
*ppos += *lenp;
|
|
return err;
|
|
}
|
|
|
|
static int do_proc_dointvec(struct ctl_table *table, int write,
|
|
void *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 *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 *p = buffer;
|
|
|
|
left = *lenp;
|
|
|
|
if (proc_first_pos_non_zero_ignore(ppos, table))
|
|
goto bail_early;
|
|
|
|
if (left > PAGE_SIZE - 1)
|
|
left = PAGE_SIZE - 1;
|
|
|
|
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:
|
|
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 *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;
|
|
}
|
|
|
|
proc_put_long(&buffer, &left, lval, false);
|
|
if (!left)
|
|
goto out;
|
|
|
|
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 *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);
|
|
}
|
|
|
|
int do_proc_douintvec(struct ctl_table *table, int write,
|
|
void *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_dobool - read/write a bool
|
|
* @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_dobool(struct ctl_table *table, int write, void *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table, write, buffer, lenp, ppos,
|
|
do_proc_dobool_conv, NULL);
|
|
}
|
|
|
|
/**
|
|
* 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 *buffer,
|
|
size_t *lenp, loff_t *ppos)
|
|
{
|
|
return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPACTION
|
|
static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
|
|
int write, void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int ret, old;
|
|
|
|
if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
|
|
return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
|
|
|
old = *(int *)table->data;
|
|
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
|
if (ret)
|
|
return ret;
|
|
if (old != *(int *)table->data)
|
|
pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
|
|
table->procname, current->comm,
|
|
task_pid_nr(current));
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* 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 *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 *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) {
|
|
int i;
|
|
|
|
/*
|
|
* If we are relying on panic_on_taint not producing
|
|
* false positives due to userspace input, bail out
|
|
* before setting the requested taint flags.
|
|
*/
|
|
if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Poor man's atomic or. Not worth adding a primitive
|
|
* to everyone's atomic.h for this
|
|
*/
|
|
for (i = 0; i < TAINT_FLAGS_COUNT; i++)
|
|
if ((1UL << i) & tmptaint)
|
|
add_taint(i, LOCKDEP_STILL_OK);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int tmp, ret;
|
|
struct do_proc_dointvec_minmax_conv_param *param = data;
|
|
/*
|
|
* If writing, first do so via a temporary local int so we can
|
|
* bounds-check it before touching *valp.
|
|
*/
|
|
int *ip = write ? &tmp : valp;
|
|
|
|
ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (write) {
|
|
if ((param->min && *param->min > tmp) ||
|
|
(param->max && *param->max < tmp))
|
|
return -EINVAL;
|
|
WRITE_ONCE(*valp, tmp);
|
|
}
|
|
|
|
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 *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)
|
|
{
|
|
int ret;
|
|
unsigned int tmp;
|
|
struct do_proc_douintvec_minmax_conv_param *param = data;
|
|
/* write via temporary local uint for bounds-checking */
|
|
unsigned int *up = write ? &tmp : valp;
|
|
|
|
ret = do_proc_douintvec_conv(lvalp, up, write, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (write) {
|
|
if ((param->min && *param->min > tmp) ||
|
|
(param->max && *param->max < tmp))
|
|
return -ERANGE;
|
|
|
|
WRITE_ONCE(*valp, tmp);
|
|
}
|
|
|
|
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 *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);
|
|
}
|
|
|
|
/**
|
|
* proc_dou8vec_minmax - read a vector of unsigned chars 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(u8) unsigned chars
|
|
* 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).
|
|
*
|
|
* Returns 0 on success or an error on write when the range check fails.
|
|
*/
|
|
int proc_dou8vec_minmax(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct ctl_table tmp;
|
|
unsigned int min = 0, max = 255U, val;
|
|
u8 *data = table->data;
|
|
struct do_proc_douintvec_minmax_conv_param param = {
|
|
.min = &min,
|
|
.max = &max,
|
|
};
|
|
int res;
|
|
|
|
/* Do not support arrays yet. */
|
|
if (table->maxlen != sizeof(u8))
|
|
return -EINVAL;
|
|
|
|
if (table->extra1) {
|
|
min = *(unsigned int *) table->extra1;
|
|
if (min > 255U)
|
|
return -EINVAL;
|
|
}
|
|
if (table->extra2) {
|
|
max = *(unsigned int *) table->extra2;
|
|
if (max > 255U)
|
|
return -EINVAL;
|
|
}
|
|
|
|
tmp = *table;
|
|
|
|
tmp.maxlen = sizeof(val);
|
|
tmp.data = &val;
|
|
val = *data;
|
|
res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
|
|
do_proc_douintvec_minmax_conv, ¶m);
|
|
if (res)
|
|
return res;
|
|
if (write)
|
|
*data = val;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
|
|
|
|
#ifdef CONFIG_MAGIC_SYSRQ
|
|
static int sysrq_sysctl_handler(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int tmp, ret;
|
|
|
|
tmp = sysrq_mask();
|
|
|
|
ret = __do_proc_dointvec(&tmp, table, write, buffer,
|
|
lenp, ppos, NULL, NULL);
|
|
if (ret || !write)
|
|
return ret;
|
|
|
|
if (write)
|
|
sysrq_toggle_support(tmp);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
|
|
int write, void *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 *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 = buffer;
|
|
}
|
|
|
|
for (; left && vleft--; i++, first = 0) {
|
|
unsigned long val;
|
|
|
|
if (write) {
|
|
bool neg;
|
|
|
|
left -= proc_skip_spaces(&p);
|
|
if (!left)
|
|
break;
|
|
|
|
err = proc_get_long(&p, &left, &val, &neg,
|
|
proc_wspace_sep,
|
|
sizeof(proc_wspace_sep), NULL);
|
|
if (err || neg) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
val = convmul * val / convdiv;
|
|
if ((min && val < *min) || (max && val > *max)) {
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
WRITE_ONCE(*i, val);
|
|
} else {
|
|
val = convdiv * READ_ONCE(*i) / convmul;
|
|
if (!first)
|
|
proc_put_char(&buffer, &left, '\t');
|
|
proc_put_long(&buffer, &left, val, false);
|
|
}
|
|
}
|
|
|
|
if (!write && !first && left && !err)
|
|
proc_put_char(&buffer, &left, '\n');
|
|
if (write && !err)
|
|
left -= proc_skip_spaces(&p);
|
|
if (write && first)
|
|
return err ? : -EINVAL;
|
|
*lenp -= left;
|
|
out:
|
|
*ppos += *lenp;
|
|
return err;
|
|
}
|
|
|
|
static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
|
|
void *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 *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 *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;
|
|
if (*negp)
|
|
WRITE_ONCE(*valp, -*lvalp * HZ);
|
|
else
|
|
WRITE_ONCE(*valp, *lvalp * HZ);
|
|
} else {
|
|
int val = READ_ONCE(*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 *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 *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 *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 *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 *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
int err = 0;
|
|
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 *p = buffer;
|
|
size_t skipped = 0;
|
|
|
|
if (left > PAGE_SIZE - 1) {
|
|
left = PAGE_SIZE - 1;
|
|
/* How much of the buffer we'll skip this pass */
|
|
skipped = *lenp - left;
|
|
}
|
|
|
|
tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
|
|
if (!tmp_bitmap)
|
|
return -ENOMEM;
|
|
proc_skip_char(&p, &left, '\n');
|
|
while (!err && left) {
|
|
unsigned long val_a, val_b;
|
|
bool neg;
|
|
size_t saved_left;
|
|
|
|
/* In case we stop parsing mid-number, we can reset */
|
|
saved_left = left;
|
|
err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
|
|
sizeof(tr_a), &c);
|
|
/*
|
|
* If we consumed the entirety of a truncated buffer or
|
|
* only one char is left (may be a "-"), then stop here,
|
|
* reset, & come back for more.
|
|
*/
|
|
if ((left <= 1) && skipped) {
|
|
left = saved_left;
|
|
break;
|
|
}
|
|
|
|
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 we consumed all of a truncated buffer or
|
|
* then stop here, reset, & come back for more.
|
|
*/
|
|
if (!left && skipped) {
|
|
left = saved_left;
|
|
break;
|
|
}
|
|
|
|
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);
|
|
proc_skip_char(&p, &left, '\n');
|
|
}
|
|
left += skipped;
|
|
} else {
|
|
unsigned long bit_a, bit_b = 0;
|
|
bool first = 1;
|
|
|
|
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)
|
|
proc_put_char(&buffer, &left, ',');
|
|
proc_put_long(&buffer, &left, bit_a, false);
|
|
if (bit_a != bit_b) {
|
|
proc_put_char(&buffer, &left, '-');
|
|
proc_put_long(&buffer, &left, bit_b, false);
|
|
}
|
|
|
|
first = 0; bit_b++;
|
|
}
|
|
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;
|
|
}
|
|
|
|
bitmap_free(tmp_bitmap);
|
|
return err;
|
|
}
|
|
|
|
#else /* CONFIG_PROC_SYSCTL */
|
|
|
|
int proc_dostring(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dobool(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_douintvec(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_minmax(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_douintvec_minmax(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dou8vec_minmax(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_jiffies(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_minmax(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
int proc_do_large_bitmap(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif /* CONFIG_PROC_SYSCTL */
|
|
|
|
#if defined(CONFIG_SYSCTL)
|
|
int proc_do_static_key(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct static_key *key = (struct static_key *)table->data;
|
|
static DEFINE_MUTEX(static_key_mutex);
|
|
int val, ret;
|
|
struct ctl_table tmp = {
|
|
.data = &val,
|
|
.maxlen = sizeof(val),
|
|
.mode = table->mode,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
};
|
|
|
|
if (write && !capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
mutex_lock(&static_key_mutex);
|
|
val = static_key_enabled(key);
|
|
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
|
|
if (write && !ret) {
|
|
if (val)
|
|
static_key_enable(key);
|
|
else
|
|
static_key_disable(key);
|
|
}
|
|
mutex_unlock(&static_key_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static struct ctl_table kern_table[] = {
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
{
|
|
.procname = "numa_balancing",
|
|
.data = NULL, /* filled in by handler */
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = sysctl_numa_balancing,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_FOUR,
|
|
},
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
{
|
|
.procname = "panic",
|
|
.data = &panic_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#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 = SYSCTL_NEG_ONE,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
#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 CONFIG_PARISC
|
|
{
|
|
.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
|
|
#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_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 = SYSCTL_ONE,
|
|
.extra2 = SYSCTL_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_MAGIC_SYSRQ
|
|
{
|
|
.procname = "sysrq",
|
|
.data = NULL,
|
|
.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 = "usermodehelper",
|
|
.mode = 0555,
|
|
.child = usermodehelper_table,
|
|
},
|
|
{
|
|
.procname = "overflowuid",
|
|
.data = &overflowuid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_MAXOLDUID,
|
|
},
|
|
{
|
|
.procname = "overflowgid",
|
|
.data = &overflowgid,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_MAXOLDUID,
|
|
},
|
|
#ifdef CONFIG_S390
|
|
{
|
|
.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,
|
|
},
|
|
{
|
|
.procname = "panic_print",
|
|
.data = &panic_print,
|
|
.maxlen = sizeof(unsigned long),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "ngroups_max",
|
|
.data = (void *)&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_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_32) || defined(CONFIG_PARISC)) && \
|
|
defined(CONFIG_DEBUG_STACKOVERFLOW)
|
|
{
|
|
.procname = "panic_on_stackoverflow",
|
|
.data = &sysctl_panic_on_stackoverflow,
|
|
.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,
|
|
},
|
|
{
|
|
.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_RT_MUTEXES
|
|
{
|
|
.procname = "max_lock_depth",
|
|
.data = &max_lock_depth,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
#endif
|
|
#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 = SYSCTL_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 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_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 = SYSCTL_ZERO,
|
|
.extra2 = (void *)&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 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE_THOUSAND,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "panic_on_warn",
|
|
.data = &panic_on_warn,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
#if defined(CONFIG_TREE_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 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
#endif
|
|
#if defined(CONFIG_TREE_RCU)
|
|
{
|
|
.procname = "max_rcu_stall_to_panic",
|
|
.data = &sysctl_max_rcu_stall_to_panic,
|
|
.maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ONE,
|
|
.extra2 = SYSCTL_INT_MAX,
|
|
},
|
|
#endif
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table vm_table[] = {
|
|
{
|
|
.procname = "overcommit_memory",
|
|
.data = &sysctl_overcommit_memory,
|
|
.maxlen = sizeof(sysctl_overcommit_memory),
|
|
.mode = 0644,
|
|
.proc_handler = overcommit_policy_handler,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_TWO,
|
|
},
|
|
{
|
|
.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 = SYSCTL_ZERO,
|
|
},
|
|
{
|
|
.procname = "dirtytime_expire_seconds",
|
|
.data = &dirtytime_expire_interval,
|
|
.maxlen = sizeof(dirtytime_expire_interval),
|
|
.mode = 0644,
|
|
.proc_handler = dirtytime_interval_handler,
|
|
.extra1 = SYSCTL_ZERO,
|
|
},
|
|
{
|
|
.procname = "swappiness",
|
|
.data = &vm_swappiness,
|
|
.maxlen = sizeof(vm_swappiness),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_TWO_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 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_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 = 0200,
|
|
.proc_handler = drop_caches_sysctl_handler,
|
|
.extra1 = SYSCTL_ONE,
|
|
.extra2 = SYSCTL_FOUR,
|
|
},
|
|
#ifdef CONFIG_COMPACTION
|
|
{
|
|
.procname = "compact_memory",
|
|
.data = NULL,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0200,
|
|
.proc_handler = sysctl_compaction_handler,
|
|
},
|
|
{
|
|
.procname = "compaction_proactiveness",
|
|
.data = &sysctl_compaction_proactiveness,
|
|
.maxlen = sizeof(sysctl_compaction_proactiveness),
|
|
.mode = 0644,
|
|
.proc_handler = compaction_proactiveness_sysctl_handler,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE_HUNDRED,
|
|
},
|
|
{
|
|
.procname = "extfrag_threshold",
|
|
.data = &sysctl_extfrag_threshold,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = (void *)&max_extfrag_threshold,
|
|
},
|
|
{
|
|
.procname = "compact_unevictable_allowed",
|
|
.data = &sysctl_compact_unevictable_allowed,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax_warn_RT_change,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_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 = SYSCTL_ZERO,
|
|
},
|
|
{
|
|
.procname = "watermark_boost_factor",
|
|
.data = &watermark_boost_factor,
|
|
.maxlen = sizeof(watermark_boost_factor),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
},
|
|
{
|
|
.procname = "watermark_scale_factor",
|
|
.data = &watermark_scale_factor,
|
|
.maxlen = sizeof(watermark_scale_factor),
|
|
.mode = 0644,
|
|
.proc_handler = watermark_scale_factor_sysctl_handler,
|
|
.extra1 = SYSCTL_ONE,
|
|
.extra2 = SYSCTL_THREE_THOUSAND,
|
|
},
|
|
{
|
|
.procname = "percpu_pagelist_high_fraction",
|
|
.data = &percpu_pagelist_high_fraction,
|
|
.maxlen = sizeof(percpu_pagelist_high_fraction),
|
|
.mode = 0644,
|
|
.proc_handler = percpu_pagelist_high_fraction_sysctl_handler,
|
|
.extra1 = SYSCTL_ZERO,
|
|
},
|
|
{
|
|
.procname = "page_lock_unfairness",
|
|
.data = &sysctl_page_lock_unfairness,
|
|
.maxlen = sizeof(sysctl_page_lock_unfairness),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_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 = SYSCTL_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 = SYSCTL_ZERO,
|
|
},
|
|
#endif
|
|
{
|
|
.procname = "vfs_cache_pressure",
|
|
.data = &sysctl_vfs_cache_pressure,
|
|
.maxlen = sizeof(sysctl_vfs_cache_pressure),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
},
|
|
#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
|
|
defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
|
|
{
|
|
.procname = "legacy_va_layout",
|
|
.data = &sysctl_legacy_va_layout,
|
|
.maxlen = sizeof(sysctl_legacy_va_layout),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_NUMA
|
|
{
|
|
.procname = "zone_reclaim_mode",
|
|
.data = &node_reclaim_mode,
|
|
.maxlen = sizeof(node_reclaim_mode),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_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 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_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 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_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 = SYSCTL_ZERO,
|
|
},
|
|
#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 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
{
|
|
.procname = "memory_failure_recovery",
|
|
.data = &sysctl_memory_failure_recovery,
|
|
.maxlen = sizeof(sysctl_memory_failure_recovery),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_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
|
|
#ifdef CONFIG_USERFAULTFD
|
|
{
|
|
.procname = "unprivileged_userfaultfd",
|
|
.data = &sysctl_unprivileged_userfaultfd,
|
|
.maxlen = sizeof(sysctl_unprivileged_userfaultfd),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
#endif
|
|
{ }
|
|
};
|
|
|
|
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
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table dev_table[] = {
|
|
{ }
|
|
};
|
|
|
|
DECLARE_SYSCTL_BASE(kernel, kern_table);
|
|
DECLARE_SYSCTL_BASE(vm, vm_table);
|
|
DECLARE_SYSCTL_BASE(debug, debug_table);
|
|
DECLARE_SYSCTL_BASE(dev, dev_table);
|
|
|
|
int __init sysctl_init_bases(void)
|
|
{
|
|
register_sysctl_base(kernel);
|
|
register_sysctl_base(vm);
|
|
register_sysctl_base(debug);
|
|
register_sysctl_base(dev);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_SYSCTL */
|
|
/*
|
|
* No sense putting this after each symbol definition, twice,
|
|
* exception granted :-)
|
|
*/
|
|
EXPORT_SYMBOL(proc_dobool);
|
|
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);
|
|
EXPORT_SYMBOL(proc_do_large_bitmap);
|