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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384// SPDX-License-Identifier: GPL-2.0-only/* * sysctl.c: General linux system control interface */
#include <linux/printk.h>#include <linux/capability.h>#include <linux/ratelimit.h>#include "internal.h"
static const int ten_thousand = 10000;
static int proc_dointvec_minmax_sysadmin(const struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos){ if (write && !capable(CAP_SYS_ADMIN)) return -EPERM;
return proc_dointvec_minmax(table, write, buffer, lenp, ppos);}
static const struct ctl_table printk_sysctls[] = { { .procname = "printk", .data = &console_loglevel, .maxlen = 4*sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, { .procname = "printk_ratelimit", .data = &printk_ratelimit_state.interval, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_jiffies, }, { .procname = "printk_ratelimit_burst", .data = &printk_ratelimit_state.burst, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, { .procname = "printk_delay", .data = &printk_delay_msec, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax, .extra1 = SYSCTL_ZERO, .extra2 = (void *)&ten_thousand, }, { .procname = "printk_devkmsg", .data = devkmsg_log_str, .maxlen = DEVKMSG_STR_MAX_SIZE, .mode = 0644, .proc_handler = devkmsg_sysctl_set_loglvl, }, { .procname = "dmesg_restrict", .data = &dmesg_restrict, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax_sysadmin, .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_ONE, }, { .procname = "kptr_restrict", .data = &kptr_restrict, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec_minmax_sysadmin, .extra1 = SYSCTL_ZERO, .extra2 = SYSCTL_TWO, },};
void __init printk_sysctl_init(void){ register_sysctl_init("kernel", printk_sysctls);}