| 1 | |
| 2 | |
| 3 | * sysctl.c: General linux system control interface
|
| 4 |
|
| 5 |
|
| 6 | #include <linux/printk.h>
|
| 7 | #include <linux/capability.h>
|
| 8 | #include <linux/ratelimit.h>
|
| 9 | #include "internal.h"
|
| 10 |
|
| 11 | static const int ten_thousand = 10000;
|
| 12 |
|
| 13 | static int proc_dointvec_minmax_sysadmin(const struct ctl_table *table, int write,
|
| 14 | void *buffer, size_t *lenp, loff_t *ppos)
|
| 15 | {
|
| 16 | if (write && !capable(CAP_SYS_ADMIN))
|
| 17 | return -EPERM;
|
| 18 |
|
| 19 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
| 20 | }
|
| 21 |
|
| 22 | static const struct ctl_table printk_sysctls[] = {
|
| 23 | {
|
| 24 | .procname = "printk",
|
| 25 | .data = &console_loglevel,
|
| 26 | .maxlen = 4*sizeof(int),
|
| 27 | .mode = 0644,
|
| 28 | .proc_handler = proc_dointvec,
|
| 29 | },
|
| 30 | {
|
| 31 | .procname = "printk_ratelimit",
|
| 32 | .data = &printk_ratelimit_state.interval,
|
| 33 | .maxlen = sizeof(int),
|
| 34 | .mode = 0644,
|
| 35 | .proc_handler = proc_dointvec_jiffies,
|
| 36 | },
|
| 37 | {
|
| 38 | .procname = "printk_ratelimit_burst",
|
| 39 | .data = &printk_ratelimit_state.burst,
|
| 40 | .maxlen = sizeof(int),
|
| 41 | .mode = 0644,
|
| 42 | .proc_handler = proc_dointvec,
|
| 43 | },
|
| 44 | {
|
| 45 | .procname = "printk_delay",
|
| 46 | .data = &printk_delay_msec,
|
| 47 | .maxlen = sizeof(int),
|
| 48 | .mode = 0644,
|
| 49 | .proc_handler = proc_dointvec_minmax,
|
| 50 | .extra1 = SYSCTL_ZERO,
|
| 51 | .extra2 = (void *)&ten_thousand,
|
| 52 | },
|
| 53 | {
|
| 54 | .procname = "printk_devkmsg",
|
| 55 | .data = devkmsg_log_str,
|
| 56 | .maxlen = DEVKMSG_STR_MAX_SIZE,
|
| 57 | .mode = 0644,
|
| 58 | .proc_handler = devkmsg_sysctl_set_loglvl,
|
| 59 | },
|
| 60 | {
|
| 61 | .procname = "dmesg_restrict",
|
| 62 | .data = &dmesg_restrict,
|
| 63 | .maxlen = sizeof(int),
|
| 64 | .mode = 0644,
|
| 65 | .proc_handler = proc_dointvec_minmax_sysadmin,
|
| 66 | .extra1 = SYSCTL_ZERO,
|
| 67 | .extra2 = SYSCTL_ONE,
|
| 68 | },
|
| 69 | {
|
| 70 | .procname = "kptr_restrict",
|
| 71 | .data = &kptr_restrict,
|
| 72 | .maxlen = sizeof(int),
|
| 73 | .mode = 0644,
|
| 74 | .proc_handler = proc_dointvec_minmax_sysadmin,
|
| 75 | .extra1 = SYSCTL_ZERO,
|
| 76 | .extra2 = SYSCTL_TWO,
|
| 77 | },
|
| 78 | };
|
| 79 |
|
| 80 | void __init printk_sysctl_init(void)
|
| 81 | {
|
| 82 | register_sysctl_init("kernel", printk_sysctls);
|
| 83 | }
|