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faaa357a XN |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * sysctl.c: General linux system control interface | |
4 | */ | |
5 | ||
6 | #include <linux/sysctl.h> | |
7 | #include <linux/printk.h> | |
8 | #include <linux/capability.h> | |
9 | #include <linux/ratelimit.h> | |
10 | #include "internal.h" | |
11 | ||
12 | static const int ten_thousand = 10000; | |
13 | ||
14 | static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, | |
1f2cfdd3 | 15 | void *buffer, size_t *lenp, loff_t *ppos) |
faaa357a XN |
16 | { |
17 | if (write && !capable(CAP_SYS_ADMIN)) | |
18 | return -EPERM; | |
19 | ||
20 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
21 | } | |
22 | ||
23 | static struct ctl_table printk_sysctls[] = { | |
24 | { | |
25 | .procname = "printk", | |
26 | .data = &console_loglevel, | |
27 | .maxlen = 4*sizeof(int), | |
28 | .mode = 0644, | |
29 | .proc_handler = proc_dointvec, | |
30 | }, | |
31 | { | |
32 | .procname = "printk_ratelimit", | |
33 | .data = &printk_ratelimit_state.interval, | |
34 | .maxlen = sizeof(int), | |
35 | .mode = 0644, | |
36 | .proc_handler = proc_dointvec_jiffies, | |
37 | }, | |
38 | { | |
39 | .procname = "printk_ratelimit_burst", | |
40 | .data = &printk_ratelimit_state.burst, | |
41 | .maxlen = sizeof(int), | |
42 | .mode = 0644, | |
43 | .proc_handler = proc_dointvec, | |
44 | }, | |
45 | { | |
46 | .procname = "printk_delay", | |
47 | .data = &printk_delay_msec, | |
48 | .maxlen = sizeof(int), | |
49 | .mode = 0644, | |
50 | .proc_handler = proc_dointvec_minmax, | |
51 | .extra1 = SYSCTL_ZERO, | |
52 | .extra2 = (void *)&ten_thousand, | |
53 | }, | |
54 | { | |
55 | .procname = "printk_devkmsg", | |
56 | .data = devkmsg_log_str, | |
57 | .maxlen = DEVKMSG_STR_MAX_SIZE, | |
58 | .mode = 0644, | |
59 | .proc_handler = devkmsg_sysctl_set_loglvl, | |
60 | }, | |
61 | { | |
62 | .procname = "dmesg_restrict", | |
63 | .data = &dmesg_restrict, | |
64 | .maxlen = sizeof(int), | |
65 | .mode = 0644, | |
66 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
67 | .extra1 = SYSCTL_ZERO, | |
68 | .extra2 = SYSCTL_ONE, | |
69 | }, | |
70 | { | |
71 | .procname = "kptr_restrict", | |
72 | .data = &kptr_restrict, | |
73 | .maxlen = sizeof(int), | |
74 | .mode = 0644, | |
75 | .proc_handler = proc_dointvec_minmax_sysadmin, | |
76 | .extra1 = SYSCTL_ZERO, | |
77 | .extra2 = SYSCTL_TWO, | |
78 | }, | |
79 | {} | |
80 | }; | |
81 | ||
82 | void __init printk_sysctl_init(void) | |
83 | { | |
84 | register_sysctl_init("kernel", printk_sysctls); | |
85 | } |