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-rw-r--r--kernel/sysctl.c270
1 files changed, 5 insertions, 265 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9b4f0cff76ea..cb6196e3fa99 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1,69 +1,28 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* sysctl.c: General linux system control interface
- *
- * Begun 24 March 1995, Stephen Tweedie
- * Added /proc support, Dec 1995
- * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
- * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
- * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
- * Dynamic registration fixes, Stephen Tweedie.
- * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
- * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
- * Horn.
- * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
- * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
- * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
- * Wendling.
- * The list_for_each() macro wasn't appropriate for the sysctl loop.
- * Removed it and replaced it with older style, 03/23/00, Bill Wendling
*/
-#include <linux/module.h>
#include <linux/sysctl.h>
#include <linux/bitmap.h>
-#include <linux/printk.h>
#include <linux/proc_fs.h>
-#include <linux/security.h>
#include <linux/ctype.h>
-#include <linux/filter.h>
-#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kobject.h>
-#include <linux/net.h>
-#include <linux/sysrq.h>
#include <linux/highuid.h>
#include <linux/writeback.h>
-#include <linux/ratelimit.h>
#include <linux/initrd.h>
-#include <linux/key.h>
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/syscalls.h>
-#include <linux/nfs_fs.h>
-#include <linux/acpi.h>
-#include <linux/reboot.h>
-#include <linux/kmod.h>
#include <linux/capability.h>
-#include <linux/binfmts.h>
-#include <linux/sched/sysctl.h>
-#include <linux/mount.h>
-#include <linux/pid.h>
#include "../lib/kstrtox.h"
#include <linux/uaccess.h>
#include <asm/processor.h>
-#ifdef CONFIG_X86
-#include <asm/nmi.h>
-#include <asm/io.h>
-#endif
-#ifdef CONFIG_RT_MUTEXES
-#include <linux/rtmutex.h>
-#endif
-
/* shared constants to be used in various sysctls */
const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 };
EXPORT_SYMBOL(sysctl_vals);
@@ -736,49 +695,6 @@ int proc_douintvec(const struct ctl_table *table, int write, void *buffer,
do_proc_douintvec_conv, NULL);
}
-/*
- * Taint values can only be increased
- * This means we can safely use a temporary.
- */
-static int proc_taint(const 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
@@ -968,26 +884,6 @@ int proc_dou8vec_minmax(const struct ctl_table *table, int write,
}
EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
-#ifdef CONFIG_MAGIC_SYSRQ
-static int sysrq_sysctl_handler(const 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,
const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos,
@@ -1292,28 +1188,6 @@ int proc_dointvec_ms_jiffies(const struct ctl_table *table, int write, void *buf
do_proc_dointvec_ms_jiffies_conv, NULL);
}
-static int proc_do_cad_pid(const 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
@@ -1580,15 +1454,9 @@ int proc_do_static_key(const struct ctl_table *table, int write,
return ret;
}
-static const struct ctl_table kern_table[] = {
+static const struct ctl_table sysctl_subsys_table[] = {
#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),
@@ -1598,95 +1466,6 @@ static const struct ctl_table kern_table[] = {
.extra2 = SYSCTL_ONE,
},
#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_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 = "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,
- },
{
.procname = "ngroups_max",
.data = (void *)&ngroups_max,
@@ -1701,20 +1480,10 @@ static const struct ctl_table kern_table[] = {
.mode = 0444,
.proc_handler = proc_dointvec,
},
-#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_MMU)
+#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
{
- .procname = "randomize_va_space",
- .data = &randomize_va_space,
+ .procname = "unaligned-trap",
+ .data = &unaligned_enabled,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
@@ -1729,40 +1498,11 @@ static const struct ctl_table kern_table[] = {
.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_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,
- },
- {
- .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
};
int __init sysctl_init_bases(void)
{
- register_sysctl_init("kernel", kern_table);
+ register_sysctl_init("kernel", sysctl_subsys_table);
return 0;
}
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