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85 lines
1.9 KiB
85 lines
1.9 KiB
// 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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#include <linux/sysctl.h> |
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#include <linux/printk.h> |
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#include <linux/capability.h> |
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#include <linux/ratelimit.h> |
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#include "internal.h" |
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static const int ten_thousand = 10000; |
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static int proc_dointvec_minmax_sysadmin(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 && !capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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return proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
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} |
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static struct ctl_table printk_sysctls[] = { |
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{ |
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.procname = "printk", |
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.data = &console_loglevel, |
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.maxlen = 4*sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ |
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.procname = "printk_ratelimit", |
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.data = &printk_ratelimit_state.interval, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec_jiffies, |
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}, |
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{ |
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.procname = "printk_ratelimit_burst", |
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.data = &printk_ratelimit_state.burst, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec, |
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}, |
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{ |
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.procname = "printk_delay", |
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.data = &printk_delay_msec, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec_minmax, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = (void *)&ten_thousand, |
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}, |
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{ |
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.procname = "printk_devkmsg", |
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.data = devkmsg_log_str, |
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.maxlen = DEVKMSG_STR_MAX_SIZE, |
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.mode = 0644, |
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.proc_handler = devkmsg_sysctl_set_loglvl, |
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}, |
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{ |
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.procname = "dmesg_restrict", |
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.data = &dmesg_restrict, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec_minmax_sysadmin, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_ONE, |
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}, |
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{ |
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.procname = "kptr_restrict", |
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.data = &kptr_restrict, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_dointvec_minmax_sysadmin, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_TWO, |
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}, |
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{} |
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}; |
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void __init printk_sysctl_init(void) |
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{ |
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register_sysctl_init("kernel", printk_sysctls); |
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}
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