| 1 | |
| 2 | |
| 3 | * sysctl.c: General linux system control interface
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| 4 |
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| 5 |
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| 6 | #include <linux/sysctl.h>
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| 7 | #include <linux/printk.h>
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| 8 | #include <linux/capability.h>
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| 9 | #include <linux/ratelimit.h>
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| 10 | #include "internal.h"
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| 11 |
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| 12 | static const int ten_thousand = 10000;
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| 13 |
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| 14 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
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| 15 | void *buffer, size_t *lenp, loff_t *ppos)
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| 16 | {
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| 17 | if (write && !capable(CAP_SYS_ADMIN))
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| 18 | return -EPERM;
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| 19 |
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| 20 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
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| 21 | }
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| 22 |
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| 23 | static struct ctl_table printk_sysctls[] = {
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| 24 | {
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| 25 | .procname = "printk",
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| 26 | .data = &console_loglevel,
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| 27 | .maxlen = 4*sizeof(int),
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| 28 | .mode = 0644,
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| 29 | .proc_handler = proc_dointvec,
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| 30 | },
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| 31 | {
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| 32 | .procname = "printk_ratelimit",
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| 33 | .data = &printk_ratelimit_state.interval,
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| 34 | .maxlen = sizeof(int),
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| 35 | .mode = 0644,
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| 36 | .proc_handler = proc_dointvec_jiffies,
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| 37 | },
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| 38 | {
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| 39 | .procname = "printk_ratelimit_burst",
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| 40 | .data = &printk_ratelimit_state.burst,
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| 41 | .maxlen = sizeof(int),
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| 42 | .mode = 0644,
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| 43 | .proc_handler = proc_dointvec,
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| 44 | },
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| 45 | {
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| 46 | .procname = "printk_delay",
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| 47 | .data = &printk_delay_msec,
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| 48 | .maxlen = sizeof(int),
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| 49 | .mode = 0644,
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| 50 | .proc_handler = proc_dointvec_minmax,
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| 51 | .extra1 = SYSCTL_ZERO,
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| 52 | .extra2 = (void *)&ten_thousand,
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| 53 | },
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| 54 | {
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| 55 | .procname = "printk_devkmsg",
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| 56 | .data = devkmsg_log_str,
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| 57 | .maxlen = DEVKMSG_STR_MAX_SIZE,
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| 58 | .mode = 0644,
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| 59 | .proc_handler = devkmsg_sysctl_set_loglvl,
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| 60 | },
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| 61 | {
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| 62 | .procname = "dmesg_restrict",
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| 63 | .data = &dmesg_restrict,
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| 64 | .maxlen = sizeof(int),
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| 65 | .mode = 0644,
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| 66 | .proc_handler = proc_dointvec_minmax_sysadmin,
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| 67 | .extra1 = SYSCTL_ZERO,
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| 68 | .extra2 = SYSCTL_ONE,
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| 69 | },
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| 70 | {
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| 71 | .procname = "kptr_restrict",
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| 72 | .data = &kptr_restrict,
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| 73 | .maxlen = sizeof(int),
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| 74 | .mode = 0644,
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| 75 | .proc_handler = proc_dointvec_minmax_sysadmin,
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| 76 | .extra1 = SYSCTL_ZERO,
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| 77 | .extra2 = SYSCTL_TWO,
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| 78 | },
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| 79 | {}
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| 80 | };
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| 81 |
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| 82 | void __init printk_sysctl_init(void)
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| 83 | {
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| 84 | register_sysctl_init("kernel", printk_sysctls);
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| 85 | }
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