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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * sysctl.c: General linux system control interface | |
4 | * | |
5 | * Begun 24 March 1995, Stephen Tweedie | |
6 | * Added /proc support, Dec 1995 | |
7 | * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. | |
8 | * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. | |
9 | * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. | |
10 | * Dynamic registration fixes, Stephen Tweedie. | |
11 | * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. | |
12 | * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris | |
13 | * Horn. | |
14 | * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. | |
15 | * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. | |
16 | * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill | |
17 | * Wendling. | |
18 | * The list_for_each() macro wasn't appropriate for the sysctl loop. | |
19 | * Removed it and replaced it with older style, 03/23/00, Bill Wendling | |
20 | */ | |
21 | ||
1da177e4 LT |
22 | #include <linux/module.h> |
23 | #include <linux/mm.h> | |
24 | #include <linux/swap.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/sysctl.h> | |
5a04cca6 | 27 | #include <linux/bitmap.h> |
d33ed52d | 28 | #include <linux/signal.h> |
f39650de | 29 | #include <linux/panic.h> |
455cd5ab | 30 | #include <linux/printk.h> |
1da177e4 | 31 | #include <linux/proc_fs.h> |
72c2d582 | 32 | #include <linux/security.h> |
1da177e4 | 33 | #include <linux/ctype.h> |
fd4b616b | 34 | #include <linux/kmemleak.h> |
b6459415 | 35 | #include <linux/filter.h> |
62239ac2 | 36 | #include <linux/fs.h> |
1da177e4 LT |
37 | #include <linux/init.h> |
38 | #include <linux/kernel.h> | |
0296b228 | 39 | #include <linux/kobject.h> |
20380731 | 40 | #include <linux/net.h> |
1da177e4 LT |
41 | #include <linux/sysrq.h> |
42 | #include <linux/highuid.h> | |
43 | #include <linux/writeback.h> | |
3fff4c42 | 44 | #include <linux/ratelimit.h> |
76ab0f53 | 45 | #include <linux/compaction.h> |
1da177e4 | 46 | #include <linux/hugetlb.h> |
1da177e4 | 47 | #include <linux/initrd.h> |
0b77f5bf | 48 | #include <linux/key.h> |
1da177e4 LT |
49 | #include <linux/times.h> |
50 | #include <linux/limits.h> | |
51 | #include <linux/dcache.h> | |
52 | #include <linux/syscalls.h> | |
c748e134 | 53 | #include <linux/vmstat.h> |
c255d844 PM |
54 | #include <linux/nfs_fs.h> |
55 | #include <linux/acpi.h> | |
10a0a8d4 | 56 | #include <linux/reboot.h> |
b0fc494f | 57 | #include <linux/ftrace.h> |
cdd6c482 | 58 | #include <linux/perf_event.h> |
b2be84df | 59 | #include <linux/kprobes.h> |
b492e95b | 60 | #include <linux/pipe_fs_i.h> |
8e4228e1 | 61 | #include <linux/oom.h> |
17f60a7d | 62 | #include <linux/kmod.h> |
73efc039 | 63 | #include <linux/capability.h> |
40401530 | 64 | #include <linux/binfmts.h> |
cf4aebc2 | 65 | #include <linux/sched/sysctl.h> |
f7ccbae4 | 66 | #include <linux/sched/coredump.h> |
7984754b | 67 | #include <linux/kexec.h> |
1be7f75d | 68 | #include <linux/bpf.h> |
d2921684 | 69 | #include <linux/mount.h> |
cefdca0a | 70 | #include <linux/userfaultfd_k.h> |
2374c09b CH |
71 | #include <linux/coredump.h> |
72 | #include <linux/latencytop.h> | |
73 | #include <linux/pid.h> | |
0cd7c741 | 74 | #include <linux/delayacct.h> |
1da177e4 | 75 | |
7f2923c4 CB |
76 | #include "../lib/kstrtox.h" |
77 | ||
7c0f6ba6 | 78 | #include <linux/uaccess.h> |
1da177e4 LT |
79 | #include <asm/processor.h> |
80 | ||
29cbc78b AK |
81 | #ifdef CONFIG_X86 |
82 | #include <asm/nmi.h> | |
0741f4d2 | 83 | #include <asm/stacktrace.h> |
6e7c4025 | 84 | #include <asm/io.h> |
29cbc78b | 85 | #endif |
d550bbd4 DH |
86 | #ifdef CONFIG_SPARC |
87 | #include <asm/setup.h> | |
88 | #endif | |
c55b7c3e DY |
89 | #ifdef CONFIG_BSD_PROCESS_ACCT |
90 | #include <linux/acct.h> | |
91 | #endif | |
4f0e056f DY |
92 | #ifdef CONFIG_RT_MUTEXES |
93 | #include <linux/rtmutex.h> | |
94 | #endif | |
2edf5e49 DY |
95 | #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) |
96 | #include <linux/lockdep.h> | |
97 | #endif | |
504d7cf1 | 98 | |
1da177e4 LT |
99 | #if defined(CONFIG_SYSCTL) |
100 | ||
c4f3b63f | 101 | /* Constants used for minimum and maximum */ |
c4f3b63f | 102 | |
af91322e | 103 | #ifdef CONFIG_PRINTK |
d73840ec | 104 | static const int ten_thousand = 10000; |
af91322e | 105 | #endif |
c5dfd78e | 106 | #ifdef CONFIG_PERF_EVENTS |
d73840ec | 107 | static const int six_hundred_forty_kb = 640 * 1024; |
c5dfd78e | 108 | #endif |
c4f3b63f | 109 | |
9e4a5bda | 110 | /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ |
d73840ec | 111 | static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE; |
9e4a5bda | 112 | |
1da177e4 | 113 | /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ |
d73840ec | 114 | static const int maxolduid = 65535; |
2452dcb9 | 115 | /* minolduid is SYSCTL_ZERO */ |
1da177e4 | 116 | |
f628867d | 117 | static const int ngroups_max = NGROUPS_MAX; |
73efc039 | 118 | static const int cap_last_cap = CAP_LAST_CAP; |
1da177e4 | 119 | |
d6f8ff73 | 120 | #ifdef CONFIG_PROC_SYSCTL |
f4aacea2 | 121 | |
a19ac337 LR |
122 | /** |
123 | * enum sysctl_writes_mode - supported sysctl write modes | |
124 | * | |
125 | * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value | |
65f50f25 WH |
126 | * to be written, and multiple writes on the same sysctl file descriptor |
127 | * will rewrite the sysctl value, regardless of file position. No warning | |
128 | * is issued when the initial position is not 0. | |
a19ac337 | 129 | * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is |
65f50f25 | 130 | * not 0. |
a19ac337 | 131 | * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at |
65f50f25 WH |
132 | * file position 0 and the value must be fully contained in the buffer |
133 | * sent to the write syscall. If dealing with strings respect the file | |
134 | * position, but restrict this to the max length of the buffer, anything | |
135 | * passed the max length will be ignored. Multiple writes will append | |
136 | * to the buffer. | |
a19ac337 LR |
137 | * |
138 | * These write modes control how current file position affects the behavior of | |
139 | * updating sysctl values through the proc interface on each write. | |
140 | */ | |
141 | enum sysctl_writes_mode { | |
142 | SYSCTL_WRITES_LEGACY = -1, | |
143 | SYSCTL_WRITES_WARN = 0, | |
144 | SYSCTL_WRITES_STRICT = 1, | |
145 | }; | |
f4aacea2 | 146 | |
a19ac337 | 147 | static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; |
f461d2dc | 148 | #endif /* CONFIG_PROC_SYSCTL */ |
ceb18132 | 149 | |
67f3977f AG |
150 | #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ |
151 | defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) | |
1da177e4 LT |
152 | int sysctl_legacy_va_layout; |
153 | #endif | |
154 | ||
5e771905 | 155 | #ifdef CONFIG_COMPACTION |
2452dcb9 | 156 | /* min_extfrag_threshold is SYSCTL_ZERO */; |
d73840ec | 157 | static const int max_extfrag_threshold = 1000; |
5e771905 MG |
158 | #endif |
159 | ||
f461d2dc CH |
160 | #endif /* CONFIG_SYSCTL */ |
161 | ||
5447e8e0 | 162 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL) |
d46edd67 | 163 | static int bpf_stats_handler(struct ctl_table *table, int write, |
7787b6fc | 164 | void *buffer, size_t *lenp, loff_t *ppos) |
d46edd67 SL |
165 | { |
166 | struct static_key *key = (struct static_key *)table->data; | |
167 | static int saved_val; | |
168 | int val, ret; | |
169 | struct ctl_table tmp = { | |
170 | .data = &val, | |
171 | .maxlen = sizeof(val), | |
172 | .mode = table->mode, | |
173 | .extra1 = SYSCTL_ZERO, | |
174 | .extra2 = SYSCTL_ONE, | |
175 | }; | |
176 | ||
177 | if (write && !capable(CAP_SYS_ADMIN)) | |
178 | return -EPERM; | |
179 | ||
180 | mutex_lock(&bpf_stats_enabled_mutex); | |
181 | val = saved_val; | |
182 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
183 | if (write && !ret && val != saved_val) { | |
184 | if (val) | |
185 | static_key_slow_inc(key); | |
186 | else | |
187 | static_key_slow_dec(key); | |
188 | saved_val = val; | |
189 | } | |
190 | mutex_unlock(&bpf_stats_enabled_mutex); | |
191 | return ret; | |
192 | } | |
08389d88 DB |
193 | |
194 | static int bpf_unpriv_handler(struct ctl_table *table, int write, | |
195 | void *buffer, size_t *lenp, loff_t *ppos) | |
196 | { | |
197 | int ret, unpriv_enable = *(int *)table->data; | |
198 | bool locked_state = unpriv_enable == 1; | |
199 | struct ctl_table tmp = *table; | |
200 | ||
201 | if (write && !capable(CAP_SYS_ADMIN)) | |
202 | return -EPERM; | |
203 | ||
204 | tmp.data = &unpriv_enable; | |
205 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
206 | if (write && !ret) { | |
207 | if (locked_state && unpriv_enable != 1) | |
208 | return -EPERM; | |
209 | *(int *)table->data = unpriv_enable; | |
210 | } | |
211 | return ret; | |
212 | } | |
213 | #endif /* CONFIG_BPF_SYSCALL && CONFIG_SYSCTL */ | |
d46edd67 | 214 | |
f461d2dc CH |
215 | /* |
216 | * /proc/sys support | |
217 | */ | |
218 | ||
b89a8171 | 219 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 220 | |
f8808300 | 221 | static int _proc_do_string(char *data, int maxlen, int write, |
32927393 | 222 | char *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
223 | { |
224 | size_t len; | |
32927393 | 225 | char c, *p; |
8d060877 ON |
226 | |
227 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
228 | *lenp = 0; |
229 | return 0; | |
230 | } | |
8d060877 | 231 | |
1da177e4 | 232 | if (write) { |
f4aacea2 KC |
233 | if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { |
234 | /* Only continue writes not past the end of buffer. */ | |
235 | len = strlen(data); | |
236 | if (len > maxlen - 1) | |
237 | len = maxlen - 1; | |
238 | ||
239 | if (*ppos > len) | |
240 | return 0; | |
241 | len = *ppos; | |
242 | } else { | |
243 | /* Start writing from beginning of buffer. */ | |
244 | len = 0; | |
245 | } | |
246 | ||
2ca9bb45 | 247 | *ppos += *lenp; |
1da177e4 | 248 | p = buffer; |
2ca9bb45 | 249 | while ((p - buffer) < *lenp && len < maxlen - 1) { |
32927393 | 250 | c = *(p++); |
1da177e4 LT |
251 | if (c == 0 || c == '\n') |
252 | break; | |
2ca9bb45 | 253 | data[len++] = c; |
1da177e4 | 254 | } |
f8808300 | 255 | data[len] = 0; |
1da177e4 | 256 | } else { |
f5dd3d6f SV |
257 | len = strlen(data); |
258 | if (len > maxlen) | |
259 | len = maxlen; | |
8d060877 ON |
260 | |
261 | if (*ppos > len) { | |
262 | *lenp = 0; | |
263 | return 0; | |
264 | } | |
265 | ||
266 | data += *ppos; | |
267 | len -= *ppos; | |
268 | ||
1da177e4 LT |
269 | if (len > *lenp) |
270 | len = *lenp; | |
271 | if (len) | |
32927393 | 272 | memcpy(buffer, data, len); |
1da177e4 | 273 | if (len < *lenp) { |
32927393 | 274 | buffer[len] = '\n'; |
1da177e4 LT |
275 | len++; |
276 | } | |
277 | *lenp = len; | |
278 | *ppos += len; | |
279 | } | |
280 | return 0; | |
281 | } | |
282 | ||
f4aacea2 KC |
283 | static void warn_sysctl_write(struct ctl_table *table) |
284 | { | |
285 | pr_warn_once("%s wrote to %s when file position was not 0!\n" | |
286 | "This will not be supported in the future. To silence this\n" | |
287 | "warning, set kernel.sysctl_writes_strict = -1\n", | |
288 | current->comm, table->procname); | |
289 | } | |
290 | ||
d383d484 | 291 | /** |
5f733e8a | 292 | * proc_first_pos_non_zero_ignore - check if first position is allowed |
d383d484 LR |
293 | * @ppos: file position |
294 | * @table: the sysctl table | |
295 | * | |
296 | * Returns true if the first position is non-zero and the sysctl_writes_strict | |
297 | * mode indicates this is not allowed for numeric input types. String proc | |
5f733e8a | 298 | * handlers can ignore the return value. |
d383d484 LR |
299 | */ |
300 | static bool proc_first_pos_non_zero_ignore(loff_t *ppos, | |
301 | struct ctl_table *table) | |
302 | { | |
303 | if (!*ppos) | |
304 | return false; | |
305 | ||
306 | switch (sysctl_writes_strict) { | |
307 | case SYSCTL_WRITES_STRICT: | |
308 | return true; | |
309 | case SYSCTL_WRITES_WARN: | |
310 | warn_sysctl_write(table); | |
311 | return false; | |
312 | default: | |
313 | return false; | |
314 | } | |
315 | } | |
316 | ||
f5dd3d6f SV |
317 | /** |
318 | * proc_dostring - read a string sysctl | |
319 | * @table: the sysctl table | |
320 | * @write: %TRUE if this is a write to the sysctl file | |
f5dd3d6f SV |
321 | * @buffer: the user buffer |
322 | * @lenp: the size of the user buffer | |
323 | * @ppos: file position | |
324 | * | |
325 | * Reads/writes a string from/to the user buffer. If the kernel | |
326 | * buffer provided is not large enough to hold the string, the | |
327 | * string is truncated. The copied string is %NULL-terminated. | |
328 | * If the string is being read by the user process, it is copied | |
329 | * and a newline '\n' is added. It is truncated if the buffer is | |
330 | * not large enough. | |
331 | * | |
332 | * Returns 0 on success. | |
333 | */ | |
8d65af78 | 334 | int proc_dostring(struct ctl_table *table, int write, |
32927393 | 335 | void *buffer, size_t *lenp, loff_t *ppos) |
f5dd3d6f | 336 | { |
d383d484 LR |
337 | if (write) |
338 | proc_first_pos_non_zero_ignore(ppos, table); | |
f4aacea2 | 339 | |
32927393 CH |
340 | return _proc_do_string(table->data, table->maxlen, write, buffer, lenp, |
341 | ppos); | |
f5dd3d6f SV |
342 | } |
343 | ||
00b7c339 AW |
344 | static size_t proc_skip_spaces(char **buf) |
345 | { | |
346 | size_t ret; | |
347 | char *tmp = skip_spaces(*buf); | |
348 | ret = tmp - *buf; | |
349 | *buf = tmp; | |
350 | return ret; | |
351 | } | |
352 | ||
9f977fb7 OP |
353 | static void proc_skip_char(char **buf, size_t *size, const char v) |
354 | { | |
355 | while (*size) { | |
356 | if (**buf != v) | |
357 | break; | |
358 | (*size)--; | |
359 | (*buf)++; | |
360 | } | |
361 | } | |
362 | ||
7f2923c4 CB |
363 | /** |
364 | * strtoul_lenient - parse an ASCII formatted integer from a buffer and only | |
365 | * fail on overflow | |
366 | * | |
367 | * @cp: kernel buffer containing the string to parse | |
368 | * @endp: pointer to store the trailing characters | |
369 | * @base: the base to use | |
370 | * @res: where the parsed integer will be stored | |
371 | * | |
372 | * In case of success 0 is returned and @res will contain the parsed integer, | |
373 | * @endp will hold any trailing characters. | |
374 | * This function will fail the parse on overflow. If there wasn't an overflow | |
375 | * the function will defer the decision what characters count as invalid to the | |
376 | * caller. | |
377 | */ | |
378 | static int strtoul_lenient(const char *cp, char **endp, unsigned int base, | |
379 | unsigned long *res) | |
380 | { | |
381 | unsigned long long result; | |
382 | unsigned int rv; | |
383 | ||
384 | cp = _parse_integer_fixup_radix(cp, &base); | |
385 | rv = _parse_integer(cp, base, &result); | |
386 | if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result)) | |
387 | return -ERANGE; | |
388 | ||
389 | cp += rv; | |
390 | ||
391 | if (endp) | |
392 | *endp = (char *)cp; | |
393 | ||
394 | *res = (unsigned long)result; | |
395 | return 0; | |
396 | } | |
397 | ||
00b7c339 AW |
398 | #define TMPBUFLEN 22 |
399 | /** | |
0fc377bd | 400 | * proc_get_long - reads an ASCII formatted integer from a user buffer |
00b7c339 | 401 | * |
0fc377bd RD |
402 | * @buf: a kernel buffer |
403 | * @size: size of the kernel buffer | |
404 | * @val: this is where the number will be stored | |
405 | * @neg: set to %TRUE if number is negative | |
406 | * @perm_tr: a vector which contains the allowed trailers | |
407 | * @perm_tr_len: size of the perm_tr vector | |
408 | * @tr: pointer to store the trailer character | |
00b7c339 | 409 | * |
0fc377bd RD |
410 | * In case of success %0 is returned and @buf and @size are updated with |
411 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
412 | * character exists (size is non-zero after returning from this | |
413 | * function), @tr is updated with the trailing character. | |
00b7c339 AW |
414 | */ |
415 | static int proc_get_long(char **buf, size_t *size, | |
416 | unsigned long *val, bool *neg, | |
417 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
418 | { | |
419 | int len; | |
420 | char *p, tmp[TMPBUFLEN]; | |
421 | ||
422 | if (!*size) | |
423 | return -EINVAL; | |
424 | ||
425 | len = *size; | |
426 | if (len > TMPBUFLEN - 1) | |
427 | len = TMPBUFLEN - 1; | |
428 | ||
429 | memcpy(tmp, *buf, len); | |
430 | ||
431 | tmp[len] = 0; | |
432 | p = tmp; | |
433 | if (*p == '-' && *size > 1) { | |
434 | *neg = true; | |
435 | p++; | |
436 | } else | |
437 | *neg = false; | |
438 | if (!isdigit(*p)) | |
439 | return -EINVAL; | |
440 | ||
7f2923c4 CB |
441 | if (strtoul_lenient(p, &p, 0, val)) |
442 | return -EINVAL; | |
00b7c339 AW |
443 | |
444 | len = p - tmp; | |
445 | ||
446 | /* We don't know if the next char is whitespace thus we may accept | |
447 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
448 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
449 | if (len == TMPBUFLEN - 1) | |
450 | return -EINVAL; | |
451 | ||
452 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
453 | return -EINVAL; | |
1da177e4 | 454 | |
00b7c339 AW |
455 | if (tr && (len < *size)) |
456 | *tr = *p; | |
457 | ||
458 | *buf += len; | |
459 | *size -= len; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | /** | |
0fc377bd | 465 | * proc_put_long - converts an integer to a decimal ASCII formatted string |
00b7c339 | 466 | * |
0fc377bd RD |
467 | * @buf: the user buffer |
468 | * @size: the size of the user buffer | |
469 | * @val: the integer to be converted | |
470 | * @neg: sign of the number, %TRUE for negative | |
00b7c339 | 471 | * |
32927393 CH |
472 | * In case of success @buf and @size are updated with the amount of bytes |
473 | * written. | |
00b7c339 | 474 | */ |
32927393 | 475 | static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg) |
00b7c339 AW |
476 | { |
477 | int len; | |
478 | char tmp[TMPBUFLEN], *p = tmp; | |
479 | ||
480 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
481 | len = strlen(tmp); | |
482 | if (len > *size) | |
483 | len = *size; | |
32927393 | 484 | memcpy(*buf, tmp, len); |
00b7c339 AW |
485 | *size -= len; |
486 | *buf += len; | |
00b7c339 AW |
487 | } |
488 | #undef TMPBUFLEN | |
489 | ||
32927393 | 490 | static void proc_put_char(void **buf, size_t *size, char c) |
00b7c339 AW |
491 | { |
492 | if (*size) { | |
32927393 CH |
493 | char **buffer = (char **)buf; |
494 | **buffer = c; | |
495 | ||
496 | (*size)--; | |
497 | (*buffer)++; | |
00b7c339 AW |
498 | *buf = *buffer; |
499 | } | |
00b7c339 | 500 | } |
1da177e4 | 501 | |
a2071573 JH |
502 | static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp, |
503 | int *valp, | |
504 | int write, void *data) | |
505 | { | |
506 | if (write) { | |
507 | *(bool *)valp = *lvalp; | |
508 | } else { | |
509 | int val = *(bool *)valp; | |
510 | ||
511 | *lvalp = (unsigned long)val; | |
512 | *negp = false; | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | ||
00b7c339 | 517 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
518 | int *valp, |
519 | int write, void *data) | |
520 | { | |
521 | if (write) { | |
230633d1 HS |
522 | if (*negp) { |
523 | if (*lvalp > (unsigned long) INT_MAX + 1) | |
524 | return -EINVAL; | |
525 | *valp = -*lvalp; | |
526 | } else { | |
527 | if (*lvalp > (unsigned long) INT_MAX) | |
528 | return -EINVAL; | |
529 | *valp = *lvalp; | |
530 | } | |
1da177e4 LT |
531 | } else { |
532 | int val = *valp; | |
533 | if (val < 0) { | |
00b7c339 | 534 | *negp = true; |
9a5bc726 | 535 | *lvalp = -(unsigned long)val; |
1da177e4 | 536 | } else { |
00b7c339 | 537 | *negp = false; |
1da177e4 LT |
538 | *lvalp = (unsigned long)val; |
539 | } | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
4f2fec00 LR |
544 | static int do_proc_douintvec_conv(unsigned long *lvalp, |
545 | unsigned int *valp, | |
546 | int write, void *data) | |
e7d316a0 SAK |
547 | { |
548 | if (write) { | |
425fffd8 LZ |
549 | if (*lvalp > UINT_MAX) |
550 | return -EINVAL; | |
e7d316a0 SAK |
551 | *valp = *lvalp; |
552 | } else { | |
553 | unsigned int val = *valp; | |
554 | *lvalp = (unsigned long)val; | |
555 | } | |
556 | return 0; | |
557 | } | |
558 | ||
00b7c339 AW |
559 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
560 | ||
d8217f07 | 561 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
32927393 | 562 | int write, void *buffer, |
fcfbd547 | 563 | size_t *lenp, loff_t *ppos, |
00b7c339 | 564 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
1da177e4 LT |
565 | int write, void *data), |
566 | void *data) | |
567 | { | |
00b7c339 | 568 | int *i, vleft, first = 1, err = 0; |
00b7c339 | 569 | size_t left; |
32927393 | 570 | char *p; |
1da177e4 | 571 | |
00b7c339 | 572 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
1da177e4 LT |
573 | *lenp = 0; |
574 | return 0; | |
575 | } | |
576 | ||
fcfbd547 | 577 | i = (int *) tbl_data; |
1da177e4 LT |
578 | vleft = table->maxlen / sizeof(*i); |
579 | left = *lenp; | |
580 | ||
581 | if (!conv) | |
582 | conv = do_proc_dointvec_conv; | |
583 | ||
00b7c339 | 584 | if (write) { |
d383d484 LR |
585 | if (proc_first_pos_non_zero_ignore(ppos, table)) |
586 | goto out; | |
f4aacea2 | 587 | |
00b7c339 AW |
588 | if (left > PAGE_SIZE - 1) |
589 | left = PAGE_SIZE - 1; | |
32927393 | 590 | p = buffer; |
00b7c339 AW |
591 | } |
592 | ||
1da177e4 | 593 | for (; left && vleft--; i++, first=0) { |
00b7c339 AW |
594 | unsigned long lval; |
595 | bool neg; | |
1da177e4 | 596 | |
00b7c339 | 597 | if (write) { |
70f6cbb6 | 598 | left -= proc_skip_spaces(&p); |
1da177e4 | 599 | |
563b0467 O |
600 | if (!left) |
601 | break; | |
70f6cbb6 | 602 | err = proc_get_long(&p, &left, &lval, &neg, |
00b7c339 AW |
603 | proc_wspace_sep, |
604 | sizeof(proc_wspace_sep), NULL); | |
605 | if (err) | |
1da177e4 | 606 | break; |
00b7c339 AW |
607 | if (conv(&neg, &lval, i, 1, data)) { |
608 | err = -EINVAL; | |
1da177e4 | 609 | break; |
00b7c339 | 610 | } |
1da177e4 | 611 | } else { |
00b7c339 AW |
612 | if (conv(&neg, &lval, i, 0, data)) { |
613 | err = -EINVAL; | |
614 | break; | |
615 | } | |
1da177e4 | 616 | if (!first) |
32927393 CH |
617 | proc_put_char(&buffer, &left, '\t'); |
618 | proc_put_long(&buffer, &left, lval, neg); | |
1da177e4 LT |
619 | } |
620 | } | |
621 | ||
00b7c339 | 622 | if (!write && !first && left && !err) |
32927393 | 623 | proc_put_char(&buffer, &left, '\n'); |
563b0467 | 624 | if (write && !err && left) |
70f6cbb6 | 625 | left -= proc_skip_spaces(&p); |
32927393 CH |
626 | if (write && first) |
627 | return err ? : -EINVAL; | |
1da177e4 | 628 | *lenp -= left; |
f4aacea2 | 629 | out: |
1da177e4 | 630 | *ppos += *lenp; |
00b7c339 | 631 | return err; |
1da177e4 LT |
632 | } |
633 | ||
8d65af78 | 634 | static int do_proc_dointvec(struct ctl_table *table, int write, |
32927393 | 635 | void *buffer, size_t *lenp, loff_t *ppos, |
00b7c339 | 636 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
fcfbd547 KK |
637 | int write, void *data), |
638 | void *data) | |
639 | { | |
8d65af78 | 640 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
641 | buffer, lenp, ppos, conv, data); |
642 | } | |
643 | ||
4f2fec00 LR |
644 | static int do_proc_douintvec_w(unsigned int *tbl_data, |
645 | struct ctl_table *table, | |
32927393 | 646 | void *buffer, |
4f2fec00 LR |
647 | size_t *lenp, loff_t *ppos, |
648 | int (*conv)(unsigned long *lvalp, | |
649 | unsigned int *valp, | |
650 | int write, void *data), | |
651 | void *data) | |
652 | { | |
653 | unsigned long lval; | |
654 | int err = 0; | |
655 | size_t left; | |
656 | bool neg; | |
32927393 | 657 | char *p = buffer; |
4f2fec00 LR |
658 | |
659 | left = *lenp; | |
660 | ||
661 | if (proc_first_pos_non_zero_ignore(ppos, table)) | |
662 | goto bail_early; | |
663 | ||
664 | if (left > PAGE_SIZE - 1) | |
665 | left = PAGE_SIZE - 1; | |
666 | ||
4f2fec00 LR |
667 | left -= proc_skip_spaces(&p); |
668 | if (!left) { | |
669 | err = -EINVAL; | |
670 | goto out_free; | |
671 | } | |
672 | ||
673 | err = proc_get_long(&p, &left, &lval, &neg, | |
674 | proc_wspace_sep, | |
675 | sizeof(proc_wspace_sep), NULL); | |
676 | if (err || neg) { | |
677 | err = -EINVAL; | |
678 | goto out_free; | |
679 | } | |
680 | ||
681 | if (conv(&lval, tbl_data, 1, data)) { | |
682 | err = -EINVAL; | |
683 | goto out_free; | |
684 | } | |
685 | ||
686 | if (!err && left) | |
687 | left -= proc_skip_spaces(&p); | |
688 | ||
689 | out_free: | |
4f2fec00 LR |
690 | if (err) |
691 | return -EINVAL; | |
692 | ||
693 | return 0; | |
694 | ||
695 | /* This is in keeping with old __do_proc_dointvec() */ | |
696 | bail_early: | |
697 | *ppos += *lenp; | |
698 | return err; | |
699 | } | |
700 | ||
32927393 | 701 | static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer, |
4f2fec00 LR |
702 | size_t *lenp, loff_t *ppos, |
703 | int (*conv)(unsigned long *lvalp, | |
704 | unsigned int *valp, | |
705 | int write, void *data), | |
706 | void *data) | |
707 | { | |
708 | unsigned long lval; | |
709 | int err = 0; | |
710 | size_t left; | |
711 | ||
712 | left = *lenp; | |
713 | ||
714 | if (conv(&lval, tbl_data, 0, data)) { | |
715 | err = -EINVAL; | |
716 | goto out; | |
717 | } | |
718 | ||
32927393 CH |
719 | proc_put_long(&buffer, &left, lval, false); |
720 | if (!left) | |
4f2fec00 LR |
721 | goto out; |
722 | ||
32927393 | 723 | proc_put_char(&buffer, &left, '\n'); |
4f2fec00 LR |
724 | |
725 | out: | |
726 | *lenp -= left; | |
727 | *ppos += *lenp; | |
728 | ||
729 | return err; | |
730 | } | |
731 | ||
732 | static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, | |
32927393 | 733 | int write, void *buffer, |
4f2fec00 LR |
734 | size_t *lenp, loff_t *ppos, |
735 | int (*conv)(unsigned long *lvalp, | |
736 | unsigned int *valp, | |
737 | int write, void *data), | |
738 | void *data) | |
739 | { | |
740 | unsigned int *i, vleft; | |
741 | ||
742 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
743 | *lenp = 0; | |
744 | return 0; | |
745 | } | |
746 | ||
747 | i = (unsigned int *) tbl_data; | |
748 | vleft = table->maxlen / sizeof(*i); | |
749 | ||
750 | /* | |
751 | * Arrays are not supported, keep this simple. *Do not* add | |
752 | * support for them. | |
753 | */ | |
754 | if (vleft != 1) { | |
755 | *lenp = 0; | |
756 | return -EINVAL; | |
757 | } | |
758 | ||
759 | if (!conv) | |
760 | conv = do_proc_douintvec_conv; | |
761 | ||
762 | if (write) | |
763 | return do_proc_douintvec_w(i, table, buffer, lenp, ppos, | |
764 | conv, data); | |
765 | return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); | |
766 | } | |
767 | ||
768 | static int do_proc_douintvec(struct ctl_table *table, int write, | |
32927393 | 769 | void *buffer, size_t *lenp, loff_t *ppos, |
4f2fec00 LR |
770 | int (*conv)(unsigned long *lvalp, |
771 | unsigned int *valp, | |
772 | int write, void *data), | |
773 | void *data) | |
774 | { | |
775 | return __do_proc_douintvec(table->data, table, write, | |
776 | buffer, lenp, ppos, conv, data); | |
777 | } | |
778 | ||
a2071573 JH |
779 | /** |
780 | * proc_dobool - read/write a bool | |
781 | * @table: the sysctl table | |
782 | * @write: %TRUE if this is a write to the sysctl file | |
783 | * @buffer: the user buffer | |
784 | * @lenp: the size of the user buffer | |
785 | * @ppos: file position | |
786 | * | |
787 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
788 | * values from/to the user buffer, treated as an ASCII string. | |
789 | * | |
790 | * Returns 0 on success. | |
791 | */ | |
792 | int proc_dobool(struct ctl_table *table, int write, void *buffer, | |
793 | size_t *lenp, loff_t *ppos) | |
794 | { | |
795 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
796 | do_proc_dobool_conv, NULL); | |
797 | } | |
798 | ||
1da177e4 LT |
799 | /** |
800 | * proc_dointvec - read a vector of integers | |
801 | * @table: the sysctl table | |
802 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
803 | * @buffer: the user buffer |
804 | * @lenp: the size of the user buffer | |
805 | * @ppos: file position | |
806 | * | |
807 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
808 | * values from/to the user buffer, treated as an ASCII string. | |
809 | * | |
810 | * Returns 0 on success. | |
811 | */ | |
32927393 CH |
812 | int proc_dointvec(struct ctl_table *table, int write, void *buffer, |
813 | size_t *lenp, loff_t *ppos) | |
1da177e4 | 814 | { |
e7d316a0 SAK |
815 | return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); |
816 | } | |
817 | ||
6923aa0d SAS |
818 | #ifdef CONFIG_COMPACTION |
819 | static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table, | |
32927393 | 820 | int write, void *buffer, size_t *lenp, loff_t *ppos) |
6923aa0d SAS |
821 | { |
822 | int ret, old; | |
823 | ||
824 | if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write) | |
825 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
826 | ||
827 | old = *(int *)table->data; | |
828 | ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
829 | if (ret) | |
830 | return ret; | |
831 | if (old != *(int *)table->data) | |
832 | pr_warn_once("sysctl attribute %s changed by %s[%d]\n", | |
833 | table->procname, current->comm, | |
834 | task_pid_nr(current)); | |
835 | return ret; | |
836 | } | |
837 | #endif | |
838 | ||
e7d316a0 SAK |
839 | /** |
840 | * proc_douintvec - read a vector of unsigned integers | |
841 | * @table: the sysctl table | |
842 | * @write: %TRUE if this is a write to the sysctl file | |
843 | * @buffer: the user buffer | |
844 | * @lenp: the size of the user buffer | |
845 | * @ppos: file position | |
846 | * | |
847 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
848 | * values from/to the user buffer, treated as an ASCII string. | |
849 | * | |
850 | * Returns 0 on success. | |
851 | */ | |
32927393 CH |
852 | int proc_douintvec(struct ctl_table *table, int write, void *buffer, |
853 | size_t *lenp, loff_t *ppos) | |
e7d316a0 | 854 | { |
4f2fec00 LR |
855 | return do_proc_douintvec(table, write, buffer, lenp, ppos, |
856 | do_proc_douintvec_conv, NULL); | |
1da177e4 LT |
857 | } |
858 | ||
34f5a398 | 859 | /* |
25ddbb18 AK |
860 | * Taint values can only be increased |
861 | * This means we can safely use a temporary. | |
34f5a398 | 862 | */ |
8d65af78 | 863 | static int proc_taint(struct ctl_table *table, int write, |
32927393 | 864 | void *buffer, size_t *lenp, loff_t *ppos) |
34f5a398 | 865 | { |
25ddbb18 AK |
866 | struct ctl_table t; |
867 | unsigned long tmptaint = get_taint(); | |
868 | int err; | |
34f5a398 | 869 | |
91fcd412 | 870 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
871 | return -EPERM; |
872 | ||
25ddbb18 AK |
873 | t = *table; |
874 | t.data = &tmptaint; | |
8d65af78 | 875 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
876 | if (err < 0) |
877 | return err; | |
878 | ||
879 | if (write) { | |
db38d5c1 RA |
880 | int i; |
881 | ||
882 | /* | |
883 | * If we are relying on panic_on_taint not producing | |
884 | * false positives due to userspace input, bail out | |
885 | * before setting the requested taint flags. | |
886 | */ | |
887 | if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint)) | |
888 | return -EINVAL; | |
889 | ||
25ddbb18 AK |
890 | /* |
891 | * Poor man's atomic or. Not worth adding a primitive | |
892 | * to everyone's atomic.h for this | |
893 | */ | |
e77132e7 RA |
894 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) |
895 | if ((1UL << i) & tmptaint) | |
373d4d09 | 896 | add_taint(i, LOCKDEP_STILL_OK); |
25ddbb18 AK |
897 | } |
898 | ||
899 | return err; | |
34f5a398 TT |
900 | } |
901 | ||
24704f36 WL |
902 | /** |
903 | * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure | |
904 | * @min: pointer to minimum allowable value | |
905 | * @max: pointer to maximum allowable value | |
906 | * | |
907 | * The do_proc_dointvec_minmax_conv_param structure provides the | |
908 | * minimum and maximum values for doing range checking for those sysctl | |
909 | * parameters that use the proc_dointvec_minmax() handler. | |
910 | */ | |
1da177e4 LT |
911 | struct do_proc_dointvec_minmax_conv_param { |
912 | int *min; | |
913 | int *max; | |
914 | }; | |
915 | ||
00b7c339 AW |
916 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
917 | int *valp, | |
1da177e4 LT |
918 | int write, void *data) |
919 | { | |
2bc4fc60 | 920 | int tmp, ret; |
1da177e4 | 921 | struct do_proc_dointvec_minmax_conv_param *param = data; |
2bc4fc60 ZW |
922 | /* |
923 | * If writing, first do so via a temporary local int so we can | |
924 | * bounds-check it before touching *valp. | |
925 | */ | |
926 | int *ip = write ? &tmp : valp; | |
927 | ||
928 | ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data); | |
929 | if (ret) | |
930 | return ret; | |
931 | ||
1da177e4 | 932 | if (write) { |
2bc4fc60 ZW |
933 | if ((param->min && *param->min > tmp) || |
934 | (param->max && *param->max < tmp)) | |
1da177e4 | 935 | return -EINVAL; |
2bc4fc60 | 936 | *valp = tmp; |
1da177e4 | 937 | } |
2bc4fc60 | 938 | |
1da177e4 LT |
939 | return 0; |
940 | } | |
941 | ||
942 | /** | |
943 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
944 | * @table: the sysctl table | |
945 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
946 | * @buffer: the user buffer |
947 | * @lenp: the size of the user buffer | |
948 | * @ppos: file position | |
949 | * | |
950 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
951 | * values from/to the user buffer, treated as an ASCII string. | |
952 | * | |
953 | * This routine will ensure the values are within the range specified by | |
954 | * table->extra1 (min) and table->extra2 (max). | |
955 | * | |
24704f36 | 956 | * Returns 0 on success or -EINVAL on write when the range check fails. |
1da177e4 | 957 | */ |
8d65af78 | 958 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
32927393 | 959 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
960 | { |
961 | struct do_proc_dointvec_minmax_conv_param param = { | |
962 | .min = (int *) table->extra1, | |
963 | .max = (int *) table->extra2, | |
964 | }; | |
8d65af78 | 965 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
966 | do_proc_dointvec_minmax_conv, ¶m); |
967 | } | |
968 | ||
24704f36 WL |
969 | /** |
970 | * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure | |
971 | * @min: pointer to minimum allowable value | |
972 | * @max: pointer to maximum allowable value | |
973 | * | |
974 | * The do_proc_douintvec_minmax_conv_param structure provides the | |
975 | * minimum and maximum values for doing range checking for those sysctl | |
976 | * parameters that use the proc_douintvec_minmax() handler. | |
977 | */ | |
61d9b56a LR |
978 | struct do_proc_douintvec_minmax_conv_param { |
979 | unsigned int *min; | |
980 | unsigned int *max; | |
981 | }; | |
982 | ||
983 | static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, | |
984 | unsigned int *valp, | |
985 | int write, void *data) | |
986 | { | |
2bc4fc60 ZW |
987 | int ret; |
988 | unsigned int tmp; | |
61d9b56a | 989 | struct do_proc_douintvec_minmax_conv_param *param = data; |
2bc4fc60 ZW |
990 | /* write via temporary local uint for bounds-checking */ |
991 | unsigned int *up = write ? &tmp : valp; | |
61d9b56a | 992 | |
2bc4fc60 ZW |
993 | ret = do_proc_douintvec_conv(lvalp, up, write, data); |
994 | if (ret) | |
995 | return ret; | |
fb910c42 | 996 | |
2bc4fc60 ZW |
997 | if (write) { |
998 | if ((param->min && *param->min > tmp) || | |
999 | (param->max && *param->max < tmp)) | |
61d9b56a LR |
1000 | return -ERANGE; |
1001 | ||
2bc4fc60 | 1002 | *valp = tmp; |
61d9b56a LR |
1003 | } |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
1008 | /** | |
1009 | * proc_douintvec_minmax - read a vector of unsigned ints with min/max values | |
1010 | * @table: the sysctl table | |
1011 | * @write: %TRUE if this is a write to the sysctl file | |
1012 | * @buffer: the user buffer | |
1013 | * @lenp: the size of the user buffer | |
1014 | * @ppos: file position | |
1015 | * | |
1016 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
1017 | * values from/to the user buffer, treated as an ASCII string. Negative | |
1018 | * strings are not allowed. | |
1019 | * | |
1020 | * This routine will ensure the values are within the range specified by | |
1021 | * table->extra1 (min) and table->extra2 (max). There is a final sanity | |
1022 | * check for UINT_MAX to avoid having to support wrap around uses from | |
1023 | * userspace. | |
1024 | * | |
24704f36 | 1025 | * Returns 0 on success or -ERANGE on write when the range check fails. |
61d9b56a LR |
1026 | */ |
1027 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
32927393 | 1028 | void *buffer, size_t *lenp, loff_t *ppos) |
61d9b56a LR |
1029 | { |
1030 | struct do_proc_douintvec_minmax_conv_param param = { | |
1031 | .min = (unsigned int *) table->extra1, | |
1032 | .max = (unsigned int *) table->extra2, | |
1033 | }; | |
1034 | return do_proc_douintvec(table, write, buffer, lenp, ppos, | |
1035 | do_proc_douintvec_minmax_conv, ¶m); | |
1036 | } | |
1037 | ||
cb944413 ED |
1038 | /** |
1039 | * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values | |
1040 | * @table: the sysctl table | |
1041 | * @write: %TRUE if this is a write to the sysctl file | |
1042 | * @buffer: the user buffer | |
1043 | * @lenp: the size of the user buffer | |
1044 | * @ppos: file position | |
1045 | * | |
1046 | * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars | |
1047 | * values from/to the user buffer, treated as an ASCII string. Negative | |
1048 | * strings are not allowed. | |
1049 | * | |
1050 | * This routine will ensure the values are within the range specified by | |
1051 | * table->extra1 (min) and table->extra2 (max). | |
1052 | * | |
1053 | * Returns 0 on success or an error on write when the range check fails. | |
1054 | */ | |
1055 | int proc_dou8vec_minmax(struct ctl_table *table, int write, | |
1056 | void *buffer, size_t *lenp, loff_t *ppos) | |
1057 | { | |
1058 | struct ctl_table tmp; | |
1059 | unsigned int min = 0, max = 255U, val; | |
1060 | u8 *data = table->data; | |
1061 | struct do_proc_douintvec_minmax_conv_param param = { | |
1062 | .min = &min, | |
1063 | .max = &max, | |
1064 | }; | |
1065 | int res; | |
1066 | ||
1067 | /* Do not support arrays yet. */ | |
1068 | if (table->maxlen != sizeof(u8)) | |
1069 | return -EINVAL; | |
1070 | ||
1071 | if (table->extra1) { | |
1072 | min = *(unsigned int *) table->extra1; | |
1073 | if (min > 255U) | |
1074 | return -EINVAL; | |
1075 | } | |
1076 | if (table->extra2) { | |
1077 | max = *(unsigned int *) table->extra2; | |
1078 | if (max > 255U) | |
1079 | return -EINVAL; | |
1080 | } | |
1081 | ||
1082 | tmp = *table; | |
1083 | ||
1084 | tmp.maxlen = sizeof(val); | |
1085 | tmp.data = &val; | |
1086 | val = *data; | |
1087 | res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos, | |
1088 | do_proc_douintvec_minmax_conv, ¶m); | |
1089 | if (res) | |
1090 | return res; | |
1091 | if (write) | |
1092 | *data = val; | |
1093 | return 0; | |
1094 | } | |
1095 | EXPORT_SYMBOL_GPL(proc_dou8vec_minmax); | |
1096 | ||
7a8d1819 JL |
1097 | static int do_proc_dopipe_max_size_conv(unsigned long *lvalp, |
1098 | unsigned int *valp, | |
1099 | int write, void *data) | |
1100 | { | |
7a8d1819 | 1101 | if (write) { |
fb910c42 | 1102 | unsigned int val; |
7a8d1819 | 1103 | |
fb910c42 | 1104 | val = round_pipe_size(*lvalp); |
7a8d1819 JL |
1105 | if (val == 0) |
1106 | return -EINVAL; | |
1107 | ||
7a8d1819 JL |
1108 | *valp = val; |
1109 | } else { | |
1110 | unsigned int val = *valp; | |
1111 | *lvalp = (unsigned long) val; | |
1112 | } | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
319e0a21 | 1117 | static int proc_dopipe_max_size(struct ctl_table *table, int write, |
32927393 | 1118 | void *buffer, size_t *lenp, loff_t *ppos) |
7a8d1819 | 1119 | { |
7a8d1819 | 1120 | return do_proc_douintvec(table, write, buffer, lenp, ppos, |
4c2e4bef | 1121 | do_proc_dopipe_max_size_conv, NULL); |
7a8d1819 JL |
1122 | } |
1123 | ||
54b50199 KC |
1124 | static void validate_coredump_safety(void) |
1125 | { | |
046d662f | 1126 | #ifdef CONFIG_COREDUMP |
e579d2c2 | 1127 | if (suid_dumpable == SUID_DUMP_ROOT && |
54b50199 | 1128 | core_pattern[0] != '/' && core_pattern[0] != '|') { |
760c6a91 AD |
1129 | printk(KERN_WARNING |
1130 | "Unsafe core_pattern used with fs.suid_dumpable=2.\n" | |
1131 | "Pipe handler or fully qualified core dump path required.\n" | |
1132 | "Set kernel.core_pattern before fs.suid_dumpable.\n" | |
1133 | ); | |
54b50199 | 1134 | } |
046d662f | 1135 | #endif |
54b50199 KC |
1136 | } |
1137 | ||
1138 | static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, | |
32927393 | 1139 | void *buffer, size_t *lenp, loff_t *ppos) |
54b50199 KC |
1140 | { |
1141 | int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
1142 | if (!error) | |
1143 | validate_coredump_safety(); | |
1144 | return error; | |
1145 | } | |
1146 | ||
046d662f | 1147 | #ifdef CONFIG_COREDUMP |
54b50199 | 1148 | static int proc_dostring_coredump(struct ctl_table *table, int write, |
32927393 | 1149 | void *buffer, size_t *lenp, loff_t *ppos) |
54b50199 KC |
1150 | { |
1151 | int error = proc_dostring(table, write, buffer, lenp, ppos); | |
1152 | if (!error) | |
1153 | validate_coredump_safety(); | |
1154 | return error; | |
1155 | } | |
046d662f | 1156 | #endif |
54b50199 | 1157 | |
eaee4172 DS |
1158 | #ifdef CONFIG_MAGIC_SYSRQ |
1159 | static int sysrq_sysctl_handler(struct ctl_table *table, int write, | |
32927393 | 1160 | void *buffer, size_t *lenp, loff_t *ppos) |
eaee4172 DS |
1161 | { |
1162 | int tmp, ret; | |
1163 | ||
1164 | tmp = sysrq_mask(); | |
1165 | ||
1166 | ret = __do_proc_dointvec(&tmp, table, write, buffer, | |
1167 | lenp, ppos, NULL, NULL); | |
1168 | if (ret || !write) | |
1169 | return ret; | |
1170 | ||
1171 | if (write) | |
1172 | sysrq_toggle_support(tmp); | |
1173 | ||
1174 | return 0; | |
1175 | } | |
1176 | #endif | |
1177 | ||
32927393 CH |
1178 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, |
1179 | int write, void *buffer, size_t *lenp, loff_t *ppos, | |
1180 | unsigned long convmul, unsigned long convdiv) | |
1da177e4 | 1181 | { |
00b7c339 AW |
1182 | unsigned long *i, *min, *max; |
1183 | int vleft, first = 1, err = 0; | |
00b7c339 | 1184 | size_t left; |
32927393 | 1185 | char *p; |
00b7c339 AW |
1186 | |
1187 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1da177e4 LT |
1188 | *lenp = 0; |
1189 | return 0; | |
1190 | } | |
00b7c339 | 1191 | |
fcfbd547 | 1192 | i = (unsigned long *) data; |
1da177e4 LT |
1193 | min = (unsigned long *) table->extra1; |
1194 | max = (unsigned long *) table->extra2; | |
1195 | vleft = table->maxlen / sizeof(unsigned long); | |
1196 | left = *lenp; | |
00b7c339 AW |
1197 | |
1198 | if (write) { | |
d383d484 LR |
1199 | if (proc_first_pos_non_zero_ignore(ppos, table)) |
1200 | goto out; | |
f4aacea2 | 1201 | |
00b7c339 AW |
1202 | if (left > PAGE_SIZE - 1) |
1203 | left = PAGE_SIZE - 1; | |
32927393 | 1204 | p = buffer; |
00b7c339 AW |
1205 | } |
1206 | ||
27b3d80a | 1207 | for (; left && vleft--; i++, first = 0) { |
00b7c339 AW |
1208 | unsigned long val; |
1209 | ||
1da177e4 | 1210 | if (write) { |
00b7c339 AW |
1211 | bool neg; |
1212 | ||
70f6cbb6 | 1213 | left -= proc_skip_spaces(&p); |
09be1784 CL |
1214 | if (!left) |
1215 | break; | |
00b7c339 | 1216 | |
70f6cbb6 | 1217 | err = proc_get_long(&p, &left, &val, &neg, |
00b7c339 AW |
1218 | proc_wspace_sep, |
1219 | sizeof(proc_wspace_sep), NULL); | |
1220 | if (err) | |
1da177e4 LT |
1221 | break; |
1222 | if (neg) | |
1da177e4 | 1223 | continue; |
ff9f8a7c | 1224 | val = convmul * val / convdiv; |
e260ad01 CB |
1225 | if ((min && val < *min) || (max && val > *max)) { |
1226 | err = -EINVAL; | |
1227 | break; | |
1228 | } | |
1da177e4 LT |
1229 | *i = val; |
1230 | } else { | |
00b7c339 | 1231 | val = convdiv * (*i) / convmul; |
32927393 CH |
1232 | if (!first) |
1233 | proc_put_char(&buffer, &left, '\t'); | |
1234 | proc_put_long(&buffer, &left, val, false); | |
1da177e4 LT |
1235 | } |
1236 | } | |
1237 | ||
00b7c339 | 1238 | if (!write && !first && left && !err) |
32927393 | 1239 | proc_put_char(&buffer, &left, '\n'); |
00b7c339 | 1240 | if (write && !err) |
70f6cbb6 | 1241 | left -= proc_skip_spaces(&p); |
32927393 CH |
1242 | if (write && first) |
1243 | return err ? : -EINVAL; | |
1da177e4 | 1244 | *lenp -= left; |
f4aacea2 | 1245 | out: |
1da177e4 | 1246 | *ppos += *lenp; |
00b7c339 | 1247 | return err; |
1da177e4 LT |
1248 | } |
1249 | ||
d8217f07 | 1250 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 CH |
1251 | void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul, |
1252 | unsigned long convdiv) | |
fcfbd547 KK |
1253 | { |
1254 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 1255 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
1256 | } |
1257 | ||
1da177e4 LT |
1258 | /** |
1259 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
1260 | * @table: the sysctl table | |
1261 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1262 | * @buffer: the user buffer |
1263 | * @lenp: the size of the user buffer | |
1264 | * @ppos: file position | |
1265 | * | |
1266 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1267 | * values from/to the user buffer, treated as an ASCII string. | |
1268 | * | |
1269 | * This routine will ensure the values are within the range specified by | |
1270 | * table->extra1 (min) and table->extra2 (max). | |
1271 | * | |
1272 | * Returns 0 on success. | |
1273 | */ | |
8d65af78 | 1274 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 | 1275 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1276 | { |
8d65af78 | 1277 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | /** | |
1281 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
1282 | * @table: the sysctl table | |
1283 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1284 | * @buffer: the user buffer |
1285 | * @lenp: the size of the user buffer | |
1286 | * @ppos: file position | |
1287 | * | |
1288 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1289 | * values from/to the user buffer, treated as an ASCII string. The values | |
1290 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
1291 | * | |
1292 | * This routine will ensure the values are within the range specified by | |
1293 | * table->extra1 (min) and table->extra2 (max). | |
1294 | * | |
1295 | * Returns 0 on success. | |
1296 | */ | |
d8217f07 | 1297 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
32927393 | 1298 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1299 | { |
8d65af78 | 1300 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
1301 | lenp, ppos, HZ, 1000l); |
1302 | } | |
1303 | ||
1304 | ||
00b7c339 | 1305 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1306 | int *valp, |
1307 | int write, void *data) | |
1308 | { | |
1309 | if (write) { | |
63259457 | 1310 | if (*lvalp > INT_MAX / HZ) |
cba9f33d | 1311 | return 1; |
1da177e4 LT |
1312 | *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); |
1313 | } else { | |
1314 | int val = *valp; | |
1315 | unsigned long lval; | |
1316 | if (val < 0) { | |
00b7c339 | 1317 | *negp = true; |
9a5bc726 | 1318 | lval = -(unsigned long)val; |
1da177e4 | 1319 | } else { |
00b7c339 | 1320 | *negp = false; |
1da177e4 LT |
1321 | lval = (unsigned long)val; |
1322 | } | |
1323 | *lvalp = lval / HZ; | |
1324 | } | |
1325 | return 0; | |
1326 | } | |
1327 | ||
00b7c339 | 1328 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1329 | int *valp, |
1330 | int write, void *data) | |
1331 | { | |
1332 | if (write) { | |
cba9f33d BS |
1333 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
1334 | return 1; | |
1da177e4 LT |
1335 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
1336 | } else { | |
1337 | int val = *valp; | |
1338 | unsigned long lval; | |
1339 | if (val < 0) { | |
00b7c339 | 1340 | *negp = true; |
9a5bc726 | 1341 | lval = -(unsigned long)val; |
1da177e4 | 1342 | } else { |
00b7c339 | 1343 | *negp = false; |
1da177e4 LT |
1344 | lval = (unsigned long)val; |
1345 | } | |
1346 | *lvalp = jiffies_to_clock_t(lval); | |
1347 | } | |
1348 | return 0; | |
1349 | } | |
1350 | ||
00b7c339 | 1351 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1352 | int *valp, |
1353 | int write, void *data) | |
1354 | { | |
1355 | if (write) { | |
d738ce8f FF |
1356 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
1357 | ||
1358 | if (jif > INT_MAX) | |
1359 | return 1; | |
1360 | *valp = (int)jif; | |
1da177e4 LT |
1361 | } else { |
1362 | int val = *valp; | |
1363 | unsigned long lval; | |
1364 | if (val < 0) { | |
00b7c339 | 1365 | *negp = true; |
9a5bc726 | 1366 | lval = -(unsigned long)val; |
1da177e4 | 1367 | } else { |
00b7c339 | 1368 | *negp = false; |
1da177e4 LT |
1369 | lval = (unsigned long)val; |
1370 | } | |
1371 | *lvalp = jiffies_to_msecs(lval); | |
1372 | } | |
1373 | return 0; | |
1374 | } | |
1375 | ||
1376 | /** | |
1377 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
1378 | * @table: the sysctl table | |
1379 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1380 | * @buffer: the user buffer |
1381 | * @lenp: the size of the user buffer | |
1382 | * @ppos: file position | |
1383 | * | |
1384 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1385 | * values from/to the user buffer, treated as an ASCII string. | |
1386 | * The values read are assumed to be in seconds, and are converted into | |
1387 | * jiffies. | |
1388 | * | |
1389 | * Returns 0 on success. | |
1390 | */ | |
8d65af78 | 1391 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
32927393 | 1392 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1393 | { |
8d65af78 | 1394 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
1395 | do_proc_dointvec_jiffies_conv,NULL); |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
1400 | * @table: the sysctl table | |
1401 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1402 | * @buffer: the user buffer |
1403 | * @lenp: the size of the user buffer | |
1e5d5331 | 1404 | * @ppos: pointer to the file position |
1da177e4 LT |
1405 | * |
1406 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1407 | * values from/to the user buffer, treated as an ASCII string. | |
1408 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
1409 | * are converted into jiffies. | |
1410 | * | |
1411 | * Returns 0 on success. | |
1412 | */ | |
8d65af78 | 1413 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
32927393 | 1414 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1415 | { |
8d65af78 | 1416 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
1417 | do_proc_dointvec_userhz_jiffies_conv,NULL); |
1418 | } | |
1419 | ||
1420 | /** | |
1421 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
1422 | * @table: the sysctl table | |
1423 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1424 | * @buffer: the user buffer |
1425 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
1426 | * @ppos: file position |
1427 | * @ppos: the current position in the file | |
1da177e4 LT |
1428 | * |
1429 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
1430 | * values from/to the user buffer, treated as an ASCII string. | |
1431 | * The values read are assumed to be in 1/1000 seconds, and | |
1432 | * are converted into jiffies. | |
1433 | * | |
1434 | * Returns 0 on success. | |
1435 | */ | |
32927393 CH |
1436 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer, |
1437 | size_t *lenp, loff_t *ppos) | |
1da177e4 | 1438 | { |
8d65af78 | 1439 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
1440 | do_proc_dointvec_ms_jiffies_conv, NULL); |
1441 | } | |
1442 | ||
32927393 CH |
1443 | static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer, |
1444 | size_t *lenp, loff_t *ppos) | |
9ec52099 CLG |
1445 | { |
1446 | struct pid *new_pid; | |
1447 | pid_t tmp; | |
1448 | int r; | |
1449 | ||
6c5f3e7b | 1450 | tmp = pid_vnr(cad_pid); |
9ec52099 | 1451 | |
8d65af78 | 1452 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
1453 | lenp, ppos, NULL, NULL); |
1454 | if (r || !write) | |
1455 | return r; | |
1456 | ||
1457 | new_pid = find_get_pid(tmp); | |
1458 | if (!new_pid) | |
1459 | return -ESRCH; | |
1460 | ||
1461 | put_pid(xchg(&cad_pid, new_pid)); | |
1462 | return 0; | |
1463 | } | |
1464 | ||
9f977fb7 OP |
1465 | /** |
1466 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
1467 | * @table: the sysctl table | |
1468 | * @write: %TRUE if this is a write to the sysctl file | |
1469 | * @buffer: the user buffer | |
1470 | * @lenp: the size of the user buffer | |
1471 | * @ppos: file position | |
1472 | * | |
1473 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
1474 | * in table->maxlen. | |
1475 | * | |
1476 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
1477 | * large bitmaps may be represented in a compact manner. Writing into | |
1478 | * the file will clear the bitmap then update it with the given input. | |
1479 | * | |
1480 | * Returns 0 on success. | |
1481 | */ | |
1482 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
32927393 | 1483 | void *buffer, size_t *lenp, loff_t *ppos) |
9f977fb7 OP |
1484 | { |
1485 | int err = 0; | |
9f977fb7 OP |
1486 | size_t left = *lenp; |
1487 | unsigned long bitmap_len = table->maxlen; | |
122ff243 | 1488 | unsigned long *bitmap = *(unsigned long **) table->data; |
9f977fb7 OP |
1489 | unsigned long *tmp_bitmap = NULL; |
1490 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
1491 | ||
122ff243 | 1492 | if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { |
9f977fb7 OP |
1493 | *lenp = 0; |
1494 | return 0; | |
1495 | } | |
1496 | ||
1497 | if (write) { | |
32927393 | 1498 | char *p = buffer; |
3116ad38 | 1499 | size_t skipped = 0; |
9f977fb7 | 1500 | |
3116ad38 | 1501 | if (left > PAGE_SIZE - 1) { |
9f977fb7 | 1502 | left = PAGE_SIZE - 1; |
3116ad38 ES |
1503 | /* How much of the buffer we'll skip this pass */ |
1504 | skipped = *lenp - left; | |
1505 | } | |
9f977fb7 | 1506 | |
475dae38 | 1507 | tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL); |
32927393 | 1508 | if (!tmp_bitmap) |
9f977fb7 | 1509 | return -ENOMEM; |
70f6cbb6 | 1510 | proc_skip_char(&p, &left, '\n'); |
9f977fb7 OP |
1511 | while (!err && left) { |
1512 | unsigned long val_a, val_b; | |
1513 | bool neg; | |
3116ad38 | 1514 | size_t saved_left; |
9f977fb7 | 1515 | |
3116ad38 ES |
1516 | /* In case we stop parsing mid-number, we can reset */ |
1517 | saved_left = left; | |
70f6cbb6 | 1518 | err = proc_get_long(&p, &left, &val_a, &neg, tr_a, |
9f977fb7 | 1519 | sizeof(tr_a), &c); |
3116ad38 ES |
1520 | /* |
1521 | * If we consumed the entirety of a truncated buffer or | |
1522 | * only one char is left (may be a "-"), then stop here, | |
1523 | * reset, & come back for more. | |
1524 | */ | |
1525 | if ((left <= 1) && skipped) { | |
1526 | left = saved_left; | |
1527 | break; | |
1528 | } | |
1529 | ||
9f977fb7 OP |
1530 | if (err) |
1531 | break; | |
1532 | if (val_a >= bitmap_len || neg) { | |
1533 | err = -EINVAL; | |
1534 | break; | |
1535 | } | |
1536 | ||
1537 | val_b = val_a; | |
1538 | if (left) { | |
70f6cbb6 | 1539 | p++; |
9f977fb7 OP |
1540 | left--; |
1541 | } | |
1542 | ||
1543 | if (c == '-') { | |
70f6cbb6 | 1544 | err = proc_get_long(&p, &left, &val_b, |
9f977fb7 OP |
1545 | &neg, tr_b, sizeof(tr_b), |
1546 | &c); | |
3116ad38 ES |
1547 | /* |
1548 | * If we consumed all of a truncated buffer or | |
1549 | * then stop here, reset, & come back for more. | |
1550 | */ | |
1551 | if (!left && skipped) { | |
1552 | left = saved_left; | |
1553 | break; | |
1554 | } | |
1555 | ||
9f977fb7 OP |
1556 | if (err) |
1557 | break; | |
1558 | if (val_b >= bitmap_len || neg || | |
1559 | val_a > val_b) { | |
1560 | err = -EINVAL; | |
1561 | break; | |
1562 | } | |
1563 | if (left) { | |
70f6cbb6 | 1564 | p++; |
9f977fb7 OP |
1565 | left--; |
1566 | } | |
1567 | } | |
1568 | ||
5a04cca6 | 1569 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); |
70f6cbb6 | 1570 | proc_skip_char(&p, &left, '\n'); |
9f977fb7 | 1571 | } |
3116ad38 | 1572 | left += skipped; |
9f977fb7 OP |
1573 | } else { |
1574 | unsigned long bit_a, bit_b = 0; | |
9a52c5f3 | 1575 | bool first = 1; |
9f977fb7 OP |
1576 | |
1577 | while (left) { | |
1578 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
1579 | if (bit_a >= bitmap_len) | |
1580 | break; | |
1581 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
1582 | bit_a + 1) - 1; | |
1583 | ||
32927393 CH |
1584 | if (!first) |
1585 | proc_put_char(&buffer, &left, ','); | |
1586 | proc_put_long(&buffer, &left, bit_a, false); | |
9f977fb7 | 1587 | if (bit_a != bit_b) { |
32927393 CH |
1588 | proc_put_char(&buffer, &left, '-'); |
1589 | proc_put_long(&buffer, &left, bit_b, false); | |
9f977fb7 OP |
1590 | } |
1591 | ||
1592 | first = 0; bit_b++; | |
1593 | } | |
32927393 | 1594 | proc_put_char(&buffer, &left, '\n'); |
9f977fb7 OP |
1595 | } |
1596 | ||
1597 | if (!err) { | |
1598 | if (write) { | |
1599 | if (*ppos) | |
1600 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
1601 | else | |
5a04cca6 | 1602 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len); |
9f977fb7 | 1603 | } |
9f977fb7 OP |
1604 | *lenp -= left; |
1605 | *ppos += *lenp; | |
9f977fb7 | 1606 | } |
f9eb2fdd | 1607 | |
475dae38 | 1608 | bitmap_free(tmp_bitmap); |
f9eb2fdd | 1609 | return err; |
9f977fb7 OP |
1610 | } |
1611 | ||
55610500 | 1612 | #else /* CONFIG_PROC_SYSCTL */ |
1da177e4 | 1613 | |
8d65af78 | 1614 | int proc_dostring(struct ctl_table *table, int write, |
32927393 | 1615 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1616 | { |
1617 | return -ENOSYS; | |
1618 | } | |
1619 | ||
a2071573 JH |
1620 | int proc_dobool(struct ctl_table *table, int write, |
1621 | void *buffer, size_t *lenp, loff_t *ppos) | |
1622 | { | |
1623 | return -ENOSYS; | |
1624 | } | |
1625 | ||
f461d2dc | 1626 | int proc_dointvec(struct ctl_table *table, int write, |
32927393 | 1627 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1628 | { |
1629 | return -ENOSYS; | |
1630 | } | |
1631 | ||
1632 | int proc_douintvec(struct ctl_table *table, int write, | |
32927393 | 1633 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1634 | { |
1635 | return -ENOSYS; | |
1636 | } | |
1637 | ||
1638 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
32927393 | 1639 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1640 | { |
1641 | return -ENOSYS; | |
1642 | } | |
1643 | ||
1644 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
32927393 | 1645 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1646 | { |
1647 | return -ENOSYS; | |
9f977fb7 OP |
1648 | } |
1649 | ||
cb944413 ED |
1650 | int proc_dou8vec_minmax(struct ctl_table *table, int write, |
1651 | void *buffer, size_t *lenp, loff_t *ppos) | |
1652 | { | |
1653 | return -ENOSYS; | |
1654 | } | |
1655 | ||
f461d2dc | 1656 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
32927393 | 1657 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1658 | { |
1659 | return -ENOSYS; | |
1660 | } | |
1da177e4 | 1661 | |
f461d2dc | 1662 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
32927393 | 1663 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1664 | { |
1665 | return -ENOSYS; | |
1666 | } | |
1667 | ||
f461d2dc | 1668 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
32927393 | 1669 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1670 | { |
1671 | return -ENOSYS; | |
1672 | } | |
1673 | ||
f461d2dc | 1674 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 | 1675 | void *buffer, size_t *lenp, loff_t *ppos) |
e7d316a0 SAK |
1676 | { |
1677 | return -ENOSYS; | |
1678 | } | |
1679 | ||
f461d2dc | 1680 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
32927393 | 1681 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1682 | { |
32927393 | 1683 | return -ENOSYS; |
1da177e4 LT |
1684 | } |
1685 | ||
f461d2dc | 1686 | int proc_do_large_bitmap(struct ctl_table *table, int write, |
32927393 | 1687 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1688 | { |
1689 | return -ENOSYS; | |
1690 | } | |
1691 | ||
f461d2dc CH |
1692 | #endif /* CONFIG_PROC_SYSCTL */ |
1693 | ||
1694 | #if defined(CONFIG_SYSCTL) | |
1695 | int proc_do_static_key(struct ctl_table *table, int write, | |
32927393 | 1696 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1697 | { |
f461d2dc CH |
1698 | struct static_key *key = (struct static_key *)table->data; |
1699 | static DEFINE_MUTEX(static_key_mutex); | |
1700 | int val, ret; | |
1701 | struct ctl_table tmp = { | |
1702 | .data = &val, | |
1703 | .maxlen = sizeof(val), | |
1704 | .mode = table->mode, | |
1705 | .extra1 = SYSCTL_ZERO, | |
1706 | .extra2 = SYSCTL_ONE, | |
1707 | }; | |
1708 | ||
1709 | if (write && !capable(CAP_SYS_ADMIN)) | |
1710 | return -EPERM; | |
1711 | ||
1712 | mutex_lock(&static_key_mutex); | |
1713 | val = static_key_enabled(key); | |
1714 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1715 | if (write && !ret) { | |
1716 | if (val) | |
1717 | static_key_enable(key); | |
1718 | else | |
1719 | static_key_disable(key); | |
1720 | } | |
1721 | mutex_unlock(&static_key_mutex); | |
1722 | return ret; | |
1da177e4 LT |
1723 | } |
1724 | ||
f461d2dc CH |
1725 | static struct ctl_table kern_table[] = { |
1726 | { | |
1727 | .procname = "sched_child_runs_first", | |
1728 | .data = &sysctl_sched_child_runs_first, | |
1729 | .maxlen = sizeof(unsigned int), | |
1730 | .mode = 0644, | |
1731 | .proc_handler = proc_dointvec, | |
1732 | }, | |
1d1c2509 PZ |
1733 | #ifdef CONFIG_SCHEDSTATS |
1734 | { | |
1735 | .procname = "sched_schedstats", | |
1736 | .data = NULL, | |
1737 | .maxlen = sizeof(unsigned int), | |
1738 | .mode = 0644, | |
1739 | .proc_handler = sysctl_schedstats, | |
1740 | .extra1 = SYSCTL_ZERO, | |
1741 | .extra2 = SYSCTL_ONE, | |
1742 | }, | |
1743 | #endif /* CONFIG_SCHEDSTATS */ | |
0cd7c741 PZ |
1744 | #ifdef CONFIG_TASK_DELAY_ACCT |
1745 | { | |
1746 | .procname = "task_delayacct", | |
1747 | .data = NULL, | |
1748 | .maxlen = sizeof(unsigned int), | |
1749 | .mode = 0644, | |
1750 | .proc_handler = sysctl_delayacct, | |
1751 | .extra1 = SYSCTL_ZERO, | |
1752 | .extra2 = SYSCTL_ONE, | |
1753 | }, | |
1754 | #endif /* CONFIG_TASK_DELAY_ACCT */ | |
b7cc6ec7 | 1755 | #ifdef CONFIG_NUMA_BALANCING |
f461d2dc CH |
1756 | { |
1757 | .procname = "numa_balancing", | |
1758 | .data = NULL, /* filled in by handler */ | |
1759 | .maxlen = sizeof(unsigned int), | |
1760 | .mode = 0644, | |
1761 | .proc_handler = sysctl_numa_balancing, | |
1762 | .extra1 = SYSCTL_ZERO, | |
1763 | .extra2 = SYSCTL_ONE, | |
1764 | }, | |
1765 | #endif /* CONFIG_NUMA_BALANCING */ | |
f461d2dc CH |
1766 | { |
1767 | .procname = "sched_rt_period_us", | |
1768 | .data = &sysctl_sched_rt_period, | |
1769 | .maxlen = sizeof(unsigned int), | |
1770 | .mode = 0644, | |
1771 | .proc_handler = sched_rt_handler, | |
1772 | }, | |
1773 | { | |
1774 | .procname = "sched_rt_runtime_us", | |
1775 | .data = &sysctl_sched_rt_runtime, | |
1776 | .maxlen = sizeof(int), | |
1777 | .mode = 0644, | |
1778 | .proc_handler = sched_rt_handler, | |
1779 | }, | |
b4098bfc PZ |
1780 | { |
1781 | .procname = "sched_deadline_period_max_us", | |
1782 | .data = &sysctl_sched_dl_period_max, | |
1783 | .maxlen = sizeof(unsigned int), | |
1784 | .mode = 0644, | |
1785 | .proc_handler = proc_dointvec, | |
1786 | }, | |
1787 | { | |
1788 | .procname = "sched_deadline_period_min_us", | |
1789 | .data = &sysctl_sched_dl_period_min, | |
1790 | .maxlen = sizeof(unsigned int), | |
1791 | .mode = 0644, | |
1792 | .proc_handler = proc_dointvec, | |
1793 | }, | |
f461d2dc CH |
1794 | { |
1795 | .procname = "sched_rr_timeslice_ms", | |
1796 | .data = &sysctl_sched_rr_timeslice, | |
1797 | .maxlen = sizeof(int), | |
1798 | .mode = 0644, | |
1799 | .proc_handler = sched_rr_handler, | |
1800 | }, | |
1801 | #ifdef CONFIG_UCLAMP_TASK | |
1802 | { | |
1803 | .procname = "sched_util_clamp_min", | |
1804 | .data = &sysctl_sched_uclamp_util_min, | |
1805 | .maxlen = sizeof(unsigned int), | |
1806 | .mode = 0644, | |
1807 | .proc_handler = sysctl_sched_uclamp_handler, | |
1808 | }, | |
1809 | { | |
1810 | .procname = "sched_util_clamp_max", | |
1811 | .data = &sysctl_sched_uclamp_util_max, | |
1812 | .maxlen = sizeof(unsigned int), | |
1813 | .mode = 0644, | |
1814 | .proc_handler = sysctl_sched_uclamp_handler, | |
1815 | }, | |
13685c4a QY |
1816 | { |
1817 | .procname = "sched_util_clamp_min_rt_default", | |
1818 | .data = &sysctl_sched_uclamp_util_min_rt_default, | |
1819 | .maxlen = sizeof(unsigned int), | |
1820 | .mode = 0644, | |
1821 | .proc_handler = sysctl_sched_uclamp_handler, | |
1822 | }, | |
f461d2dc CH |
1823 | #endif |
1824 | #ifdef CONFIG_SCHED_AUTOGROUP | |
1825 | { | |
1826 | .procname = "sched_autogroup_enabled", | |
1827 | .data = &sysctl_sched_autogroup_enabled, | |
1828 | .maxlen = sizeof(unsigned int), | |
1829 | .mode = 0644, | |
1830 | .proc_handler = proc_dointvec_minmax, | |
1831 | .extra1 = SYSCTL_ZERO, | |
1832 | .extra2 = SYSCTL_ONE, | |
1833 | }, | |
1834 | #endif | |
1835 | #ifdef CONFIG_CFS_BANDWIDTH | |
1836 | { | |
1837 | .procname = "sched_cfs_bandwidth_slice_us", | |
1838 | .data = &sysctl_sched_cfs_bandwidth_slice, | |
1839 | .maxlen = sizeof(unsigned int), | |
1840 | .mode = 0644, | |
1841 | .proc_handler = proc_dointvec_minmax, | |
1842 | .extra1 = SYSCTL_ONE, | |
1843 | }, | |
1844 | #endif | |
1845 | #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL) | |
1846 | { | |
1847 | .procname = "sched_energy_aware", | |
1848 | .data = &sysctl_sched_energy_aware, | |
1849 | .maxlen = sizeof(unsigned int), | |
1850 | .mode = 0644, | |
1851 | .proc_handler = sched_energy_aware_handler, | |
1852 | .extra1 = SYSCTL_ZERO, | |
1853 | .extra2 = SYSCTL_ONE, | |
1854 | }, | |
1855 | #endif | |
1856 | #ifdef CONFIG_PROVE_LOCKING | |
1857 | { | |
1858 | .procname = "prove_locking", | |
1859 | .data = &prove_locking, | |
1860 | .maxlen = sizeof(int), | |
1861 | .mode = 0644, | |
1862 | .proc_handler = proc_dointvec, | |
1863 | }, | |
1864 | #endif | |
1865 | #ifdef CONFIG_LOCK_STAT | |
1866 | { | |
1867 | .procname = "lock_stat", | |
1868 | .data = &lock_stat, | |
1869 | .maxlen = sizeof(int), | |
1870 | .mode = 0644, | |
1871 | .proc_handler = proc_dointvec, | |
1872 | }, | |
1873 | #endif | |
1874 | { | |
1875 | .procname = "panic", | |
1876 | .data = &panic_timeout, | |
1877 | .maxlen = sizeof(int), | |
1878 | .mode = 0644, | |
1879 | .proc_handler = proc_dointvec, | |
1880 | }, | |
1881 | #ifdef CONFIG_COREDUMP | |
1882 | { | |
1883 | .procname = "core_uses_pid", | |
1884 | .data = &core_uses_pid, | |
1885 | .maxlen = sizeof(int), | |
1886 | .mode = 0644, | |
1887 | .proc_handler = proc_dointvec, | |
1888 | }, | |
1889 | { | |
1890 | .procname = "core_pattern", | |
1891 | .data = core_pattern, | |
1892 | .maxlen = CORENAME_MAX_SIZE, | |
1893 | .mode = 0644, | |
1894 | .proc_handler = proc_dostring_coredump, | |
1895 | }, | |
1896 | { | |
1897 | .procname = "core_pipe_limit", | |
1898 | .data = &core_pipe_limit, | |
1899 | .maxlen = sizeof(unsigned int), | |
1900 | .mode = 0644, | |
1901 | .proc_handler = proc_dointvec, | |
1902 | }, | |
1903 | #endif | |
1904 | #ifdef CONFIG_PROC_SYSCTL | |
1905 | { | |
1906 | .procname = "tainted", | |
1907 | .maxlen = sizeof(long), | |
1908 | .mode = 0644, | |
1909 | .proc_handler = proc_taint, | |
1910 | }, | |
1911 | { | |
1912 | .procname = "sysctl_writes_strict", | |
1913 | .data = &sysctl_writes_strict, | |
1914 | .maxlen = sizeof(int), | |
1915 | .mode = 0644, | |
1916 | .proc_handler = proc_dointvec_minmax, | |
78e36f3b | 1917 | .extra1 = SYSCTL_NEG_ONE, |
f461d2dc CH |
1918 | .extra2 = SYSCTL_ONE, |
1919 | }, | |
1920 | #endif | |
1921 | #ifdef CONFIG_LATENCYTOP | |
1922 | { | |
1923 | .procname = "latencytop", | |
1924 | .data = &latencytop_enabled, | |
1925 | .maxlen = sizeof(int), | |
1926 | .mode = 0644, | |
1927 | .proc_handler = sysctl_latencytop, | |
1928 | }, | |
1929 | #endif | |
1930 | #ifdef CONFIG_BLK_DEV_INITRD | |
1931 | { | |
1932 | .procname = "real-root-dev", | |
1933 | .data = &real_root_dev, | |
1934 | .maxlen = sizeof(int), | |
1935 | .mode = 0644, | |
1936 | .proc_handler = proc_dointvec, | |
1937 | }, | |
1938 | #endif | |
1939 | { | |
1940 | .procname = "print-fatal-signals", | |
1941 | .data = &print_fatal_signals, | |
1942 | .maxlen = sizeof(int), | |
1943 | .mode = 0644, | |
1944 | .proc_handler = proc_dointvec, | |
1945 | }, | |
1946 | #ifdef CONFIG_SPARC | |
1947 | { | |
1948 | .procname = "reboot-cmd", | |
1949 | .data = reboot_command, | |
1950 | .maxlen = 256, | |
1951 | .mode = 0644, | |
1952 | .proc_handler = proc_dostring, | |
1953 | }, | |
1954 | { | |
1955 | .procname = "stop-a", | |
1956 | .data = &stop_a_enabled, | |
1957 | .maxlen = sizeof (int), | |
1958 | .mode = 0644, | |
1959 | .proc_handler = proc_dointvec, | |
1960 | }, | |
1961 | { | |
1962 | .procname = "scons-poweroff", | |
1963 | .data = &scons_pwroff, | |
1964 | .maxlen = sizeof (int), | |
1965 | .mode = 0644, | |
1966 | .proc_handler = proc_dointvec, | |
1967 | }, | |
1968 | #endif | |
1969 | #ifdef CONFIG_SPARC64 | |
1970 | { | |
1971 | .procname = "tsb-ratio", | |
1972 | .data = &sysctl_tsb_ratio, | |
1973 | .maxlen = sizeof (int), | |
1974 | .mode = 0644, | |
1975 | .proc_handler = proc_dointvec, | |
1976 | }, | |
1977 | #endif | |
1978 | #ifdef CONFIG_PARISC | |
1979 | { | |
1980 | .procname = "soft-power", | |
1981 | .data = &pwrsw_enabled, | |
1982 | .maxlen = sizeof (int), | |
1983 | .mode = 0644, | |
1984 | .proc_handler = proc_dointvec, | |
1985 | }, | |
1986 | #endif | |
1987 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
1988 | { | |
1989 | .procname = "unaligned-trap", | |
1990 | .data = &unaligned_enabled, | |
1991 | .maxlen = sizeof (int), | |
1992 | .mode = 0644, | |
1993 | .proc_handler = proc_dointvec, | |
1994 | }, | |
1995 | #endif | |
1996 | { | |
1997 | .procname = "ctrl-alt-del", | |
1998 | .data = &C_A_D, | |
1999 | .maxlen = sizeof(int), | |
2000 | .mode = 0644, | |
2001 | .proc_handler = proc_dointvec, | |
2002 | }, | |
2003 | #ifdef CONFIG_FUNCTION_TRACER | |
2004 | { | |
2005 | .procname = "ftrace_enabled", | |
2006 | .data = &ftrace_enabled, | |
2007 | .maxlen = sizeof(int), | |
2008 | .mode = 0644, | |
2009 | .proc_handler = ftrace_enable_sysctl, | |
2010 | }, | |
2011 | #endif | |
2012 | #ifdef CONFIG_STACK_TRACER | |
2013 | { | |
2014 | .procname = "stack_tracer_enabled", | |
2015 | .data = &stack_tracer_enabled, | |
2016 | .maxlen = sizeof(int), | |
2017 | .mode = 0644, | |
2018 | .proc_handler = stack_trace_sysctl, | |
2019 | }, | |
2020 | #endif | |
2021 | #ifdef CONFIG_TRACING | |
2022 | { | |
2023 | .procname = "ftrace_dump_on_oops", | |
2024 | .data = &ftrace_dump_on_oops, | |
2025 | .maxlen = sizeof(int), | |
2026 | .mode = 0644, | |
2027 | .proc_handler = proc_dointvec, | |
2028 | }, | |
2029 | { | |
2030 | .procname = "traceoff_on_warning", | |
2031 | .data = &__disable_trace_on_warning, | |
2032 | .maxlen = sizeof(__disable_trace_on_warning), | |
2033 | .mode = 0644, | |
2034 | .proc_handler = proc_dointvec, | |
2035 | }, | |
2036 | { | |
2037 | .procname = "tracepoint_printk", | |
2038 | .data = &tracepoint_printk, | |
2039 | .maxlen = sizeof(tracepoint_printk), | |
2040 | .mode = 0644, | |
2041 | .proc_handler = tracepoint_printk_sysctl, | |
2042 | }, | |
2043 | #endif | |
2044 | #ifdef CONFIG_KEXEC_CORE | |
2045 | { | |
2046 | .procname = "kexec_load_disabled", | |
2047 | .data = &kexec_load_disabled, | |
2048 | .maxlen = sizeof(int), | |
2049 | .mode = 0644, | |
2050 | /* only handle a transition from default "0" to "1" */ | |
2051 | .proc_handler = proc_dointvec_minmax, | |
2052 | .extra1 = SYSCTL_ONE, | |
2053 | .extra2 = SYSCTL_ONE, | |
2054 | }, | |
2055 | #endif | |
2056 | #ifdef CONFIG_MODULES | |
2057 | { | |
2058 | .procname = "modprobe", | |
2059 | .data = &modprobe_path, | |
2060 | .maxlen = KMOD_PATH_LEN, | |
2061 | .mode = 0644, | |
2062 | .proc_handler = proc_dostring, | |
2063 | }, | |
2064 | { | |
2065 | .procname = "modules_disabled", | |
2066 | .data = &modules_disabled, | |
2067 | .maxlen = sizeof(int), | |
2068 | .mode = 0644, | |
2069 | /* only handle a transition from default "0" to "1" */ | |
2070 | .proc_handler = proc_dointvec_minmax, | |
2071 | .extra1 = SYSCTL_ONE, | |
2072 | .extra2 = SYSCTL_ONE, | |
2073 | }, | |
2074 | #endif | |
2075 | #ifdef CONFIG_UEVENT_HELPER | |
2076 | { | |
2077 | .procname = "hotplug", | |
2078 | .data = &uevent_helper, | |
2079 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
2080 | .mode = 0644, | |
2081 | .proc_handler = proc_dostring, | |
2082 | }, | |
2083 | #endif | |
f461d2dc CH |
2084 | #ifdef CONFIG_BSD_PROCESS_ACCT |
2085 | { | |
2086 | .procname = "acct", | |
2087 | .data = &acct_parm, | |
2088 | .maxlen = 3*sizeof(int), | |
2089 | .mode = 0644, | |
2090 | .proc_handler = proc_dointvec, | |
2091 | }, | |
2092 | #endif | |
2093 | #ifdef CONFIG_MAGIC_SYSRQ | |
2094 | { | |
2095 | .procname = "sysrq", | |
2096 | .data = NULL, | |
2097 | .maxlen = sizeof (int), | |
2098 | .mode = 0644, | |
2099 | .proc_handler = sysrq_sysctl_handler, | |
2100 | }, | |
2101 | #endif | |
2102 | #ifdef CONFIG_PROC_SYSCTL | |
2103 | { | |
2104 | .procname = "cad_pid", | |
2105 | .data = NULL, | |
2106 | .maxlen = sizeof (int), | |
2107 | .mode = 0600, | |
2108 | .proc_handler = proc_do_cad_pid, | |
2109 | }, | |
2110 | #endif | |
2111 | { | |
2112 | .procname = "threads-max", | |
2113 | .data = NULL, | |
2114 | .maxlen = sizeof(int), | |
2115 | .mode = 0644, | |
2116 | .proc_handler = sysctl_max_threads, | |
2117 | }, | |
f461d2dc CH |
2118 | { |
2119 | .procname = "usermodehelper", | |
2120 | .mode = 0555, | |
2121 | .child = usermodehelper_table, | |
2122 | }, | |
f461d2dc CH |
2123 | { |
2124 | .procname = "overflowuid", | |
2125 | .data = &overflowuid, | |
2126 | .maxlen = sizeof(int), | |
2127 | .mode = 0644, | |
2128 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 2129 | .extra1 = SYSCTL_ZERO, |
d73840ec | 2130 | .extra2 = (void *)&maxolduid, |
f461d2dc CH |
2131 | }, |
2132 | { | |
2133 | .procname = "overflowgid", | |
2134 | .data = &overflowgid, | |
2135 | .maxlen = sizeof(int), | |
2136 | .mode = 0644, | |
2137 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 2138 | .extra1 = SYSCTL_ZERO, |
d73840ec | 2139 | .extra2 = (void *)&maxolduid, |
f461d2dc CH |
2140 | }, |
2141 | #ifdef CONFIG_S390 | |
2142 | { | |
2143 | .procname = "userprocess_debug", | |
2144 | .data = &show_unhandled_signals, | |
2145 | .maxlen = sizeof(int), | |
2146 | .mode = 0644, | |
2147 | .proc_handler = proc_dointvec, | |
2148 | }, | |
2149 | #endif | |
60c958d8 GP |
2150 | #ifdef CONFIG_SMP |
2151 | { | |
2152 | .procname = "oops_all_cpu_backtrace", | |
2153 | .data = &sysctl_oops_all_cpu_backtrace, | |
2154 | .maxlen = sizeof(int), | |
2155 | .mode = 0644, | |
2156 | .proc_handler = proc_dointvec_minmax, | |
2157 | .extra1 = SYSCTL_ZERO, | |
2158 | .extra2 = SYSCTL_ONE, | |
2159 | }, | |
2160 | #endif /* CONFIG_SMP */ | |
f461d2dc CH |
2161 | { |
2162 | .procname = "pid_max", | |
2163 | .data = &pid_max, | |
2164 | .maxlen = sizeof (int), | |
2165 | .mode = 0644, | |
2166 | .proc_handler = proc_dointvec_minmax, | |
2167 | .extra1 = &pid_max_min, | |
2168 | .extra2 = &pid_max_max, | |
2169 | }, | |
2170 | { | |
2171 | .procname = "panic_on_oops", | |
2172 | .data = &panic_on_oops, | |
2173 | .maxlen = sizeof(int), | |
2174 | .mode = 0644, | |
2175 | .proc_handler = proc_dointvec, | |
2176 | }, | |
2177 | { | |
2178 | .procname = "panic_print", | |
2179 | .data = &panic_print, | |
2180 | .maxlen = sizeof(unsigned long), | |
2181 | .mode = 0644, | |
2182 | .proc_handler = proc_doulongvec_minmax, | |
2183 | }, | |
f461d2dc CH |
2184 | { |
2185 | .procname = "ngroups_max", | |
f628867d | 2186 | .data = (void *)&ngroups_max, |
f461d2dc CH |
2187 | .maxlen = sizeof (int), |
2188 | .mode = 0444, | |
2189 | .proc_handler = proc_dointvec, | |
2190 | }, | |
2191 | { | |
2192 | .procname = "cap_last_cap", | |
2193 | .data = (void *)&cap_last_cap, | |
2194 | .maxlen = sizeof(int), | |
2195 | .mode = 0444, | |
2196 | .proc_handler = proc_dointvec, | |
2197 | }, | |
f461d2dc CH |
2198 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
2199 | { | |
2200 | .procname = "unknown_nmi_panic", | |
2201 | .data = &unknown_nmi_panic, | |
2202 | .maxlen = sizeof (int), | |
2203 | .mode = 0644, | |
2204 | .proc_handler = proc_dointvec, | |
2205 | }, | |
2206 | #endif | |
61d9b56a | 2207 | |
cb8e59cc LT |
2208 | #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \ |
2209 | defined(CONFIG_DEBUG_STACKOVERFLOW) | |
f461d2dc | 2210 | { |
cb8e59cc LT |
2211 | .procname = "panic_on_stackoverflow", |
2212 | .data = &sysctl_panic_on_stackoverflow, | |
f461d2dc CH |
2213 | .maxlen = sizeof(int), |
2214 | .mode = 0644, | |
2215 | .proc_handler = proc_dointvec, | |
2216 | }, | |
cb8e59cc LT |
2217 | #endif |
2218 | #if defined(CONFIG_X86) | |
f461d2dc | 2219 | { |
cb8e59cc LT |
2220 | .procname = "panic_on_unrecovered_nmi", |
2221 | .data = &panic_on_unrecovered_nmi, | |
f461d2dc CH |
2222 | .maxlen = sizeof(int), |
2223 | .mode = 0644, | |
2224 | .proc_handler = proc_dointvec, | |
2225 | }, | |
f461d2dc | 2226 | { |
cb8e59cc LT |
2227 | .procname = "panic_on_io_nmi", |
2228 | .data = &panic_on_io_nmi, | |
f461d2dc CH |
2229 | .maxlen = sizeof(int), |
2230 | .mode = 0644, | |
2231 | .proc_handler = proc_dointvec, | |
2232 | }, | |
f461d2dc CH |
2233 | { |
2234 | .procname = "bootloader_type", | |
2235 | .data = &bootloader_type, | |
2236 | .maxlen = sizeof (int), | |
2237 | .mode = 0444, | |
2238 | .proc_handler = proc_dointvec, | |
2239 | }, | |
2240 | { | |
2241 | .procname = "bootloader_version", | |
2242 | .data = &bootloader_version, | |
2243 | .maxlen = sizeof (int), | |
2244 | .mode = 0444, | |
2245 | .proc_handler = proc_dointvec, | |
2246 | }, | |
2247 | { | |
2248 | .procname = "io_delay_type", | |
2249 | .data = &io_delay_type, | |
2250 | .maxlen = sizeof(int), | |
2251 | .mode = 0644, | |
2252 | .proc_handler = proc_dointvec, | |
2253 | }, | |
2254 | #endif | |
2255 | #if defined(CONFIG_MMU) | |
2256 | { | |
2257 | .procname = "randomize_va_space", | |
2258 | .data = &randomize_va_space, | |
2259 | .maxlen = sizeof(int), | |
2260 | .mode = 0644, | |
2261 | .proc_handler = proc_dointvec, | |
2262 | }, | |
2263 | #endif | |
2264 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) | |
2265 | { | |
2266 | .procname = "spin_retry", | |
2267 | .data = &spin_retry, | |
2268 | .maxlen = sizeof (int), | |
2269 | .mode = 0644, | |
2270 | .proc_handler = proc_dointvec, | |
2271 | }, | |
2272 | #endif | |
2273 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) | |
2274 | { | |
2275 | .procname = "acpi_video_flags", | |
2276 | .data = &acpi_realmode_flags, | |
2277 | .maxlen = sizeof (unsigned long), | |
2278 | .mode = 0644, | |
2279 | .proc_handler = proc_doulongvec_minmax, | |
2280 | }, | |
2281 | #endif | |
2282 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
2283 | { | |
2284 | .procname = "ignore-unaligned-usertrap", | |
2285 | .data = &no_unaligned_warning, | |
2286 | .maxlen = sizeof (int), | |
2287 | .mode = 0644, | |
2288 | .proc_handler = proc_dointvec, | |
2289 | }, | |
2290 | #endif | |
2291 | #ifdef CONFIG_IA64 | |
2292 | { | |
2293 | .procname = "unaligned-dump-stack", | |
2294 | .data = &unaligned_dump_stack, | |
2295 | .maxlen = sizeof (int), | |
2296 | .mode = 0644, | |
2297 | .proc_handler = proc_dointvec, | |
2298 | }, | |
2299 | #endif | |
f461d2dc CH |
2300 | #ifdef CONFIG_RT_MUTEXES |
2301 | { | |
2302 | .procname = "max_lock_depth", | |
2303 | .data = &max_lock_depth, | |
2304 | .maxlen = sizeof(int), | |
2305 | .mode = 0644, | |
2306 | .proc_handler = proc_dointvec, | |
2307 | }, | |
2308 | #endif | |
2309 | { | |
2310 | .procname = "poweroff_cmd", | |
2311 | .data = &poweroff_cmd, | |
2312 | .maxlen = POWEROFF_CMD_PATH_LEN, | |
2313 | .mode = 0644, | |
2314 | .proc_handler = proc_dostring, | |
2315 | }, | |
2316 | #ifdef CONFIG_KEYS | |
2317 | { | |
2318 | .procname = "keys", | |
2319 | .mode = 0555, | |
2320 | .child = key_sysctls, | |
2321 | }, | |
2322 | #endif | |
2323 | #ifdef CONFIG_PERF_EVENTS | |
2324 | /* | |
2325 | * User-space scripts rely on the existence of this file | |
2326 | * as a feature check for perf_events being enabled. | |
2327 | * | |
2328 | * So it's an ABI, do not remove! | |
2329 | */ | |
2330 | { | |
2331 | .procname = "perf_event_paranoid", | |
2332 | .data = &sysctl_perf_event_paranoid, | |
2333 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
2334 | .mode = 0644, | |
2335 | .proc_handler = proc_dointvec, | |
2336 | }, | |
2337 | { | |
2338 | .procname = "perf_event_mlock_kb", | |
2339 | .data = &sysctl_perf_event_mlock, | |
2340 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
2341 | .mode = 0644, | |
2342 | .proc_handler = proc_dointvec, | |
2343 | }, | |
2344 | { | |
2345 | .procname = "perf_event_max_sample_rate", | |
2346 | .data = &sysctl_perf_event_sample_rate, | |
2347 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
2348 | .mode = 0644, | |
2349 | .proc_handler = perf_proc_update_handler, | |
2350 | .extra1 = SYSCTL_ONE, | |
2351 | }, | |
2352 | { | |
2353 | .procname = "perf_cpu_time_max_percent", | |
2354 | .data = &sysctl_perf_cpu_time_max_percent, | |
2355 | .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), | |
2356 | .mode = 0644, | |
2357 | .proc_handler = perf_cpu_time_max_percent_handler, | |
2358 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2359 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2360 | }, |
2361 | { | |
2362 | .procname = "perf_event_max_stack", | |
2363 | .data = &sysctl_perf_event_max_stack, | |
2364 | .maxlen = sizeof(sysctl_perf_event_max_stack), | |
2365 | .mode = 0644, | |
2366 | .proc_handler = perf_event_max_stack_handler, | |
2367 | .extra1 = SYSCTL_ZERO, | |
d73840ec | 2368 | .extra2 = (void *)&six_hundred_forty_kb, |
f461d2dc CH |
2369 | }, |
2370 | { | |
2371 | .procname = "perf_event_max_contexts_per_stack", | |
2372 | .data = &sysctl_perf_event_max_contexts_per_stack, | |
2373 | .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), | |
2374 | .mode = 0644, | |
2375 | .proc_handler = perf_event_max_stack_handler, | |
2376 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2377 | .extra2 = SYSCTL_ONE_THOUSAND, |
f461d2dc CH |
2378 | }, |
2379 | #endif | |
2380 | { | |
2381 | .procname = "panic_on_warn", | |
2382 | .data = &panic_on_warn, | |
2383 | .maxlen = sizeof(int), | |
2384 | .mode = 0644, | |
2385 | .proc_handler = proc_dointvec_minmax, | |
2386 | .extra1 = SYSCTL_ZERO, | |
2387 | .extra2 = SYSCTL_ONE, | |
2388 | }, | |
2389 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) | |
2390 | { | |
2391 | .procname = "timer_migration", | |
2392 | .data = &sysctl_timer_migration, | |
2393 | .maxlen = sizeof(unsigned int), | |
2394 | .mode = 0644, | |
2395 | .proc_handler = timer_migration_handler, | |
2396 | .extra1 = SYSCTL_ZERO, | |
2397 | .extra2 = SYSCTL_ONE, | |
2398 | }, | |
2399 | #endif | |
2400 | #ifdef CONFIG_BPF_SYSCALL | |
2401 | { | |
2402 | .procname = "unprivileged_bpf_disabled", | |
2403 | .data = &sysctl_unprivileged_bpf_disabled, | |
2404 | .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), | |
2405 | .mode = 0644, | |
08389d88 DB |
2406 | .proc_handler = bpf_unpriv_handler, |
2407 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2408 | .extra2 = SYSCTL_TWO, |
f461d2dc CH |
2409 | }, |
2410 | { | |
2411 | .procname = "bpf_stats_enabled", | |
2412 | .data = &bpf_stats_enabled_key.key, | |
2413 | .maxlen = sizeof(bpf_stats_enabled_key), | |
2414 | .mode = 0644, | |
d46edd67 | 2415 | .proc_handler = bpf_stats_handler, |
f461d2dc CH |
2416 | }, |
2417 | #endif | |
2418 | #if defined(CONFIG_TREE_RCU) | |
2419 | { | |
2420 | .procname = "panic_on_rcu_stall", | |
2421 | .data = &sysctl_panic_on_rcu_stall, | |
2422 | .maxlen = sizeof(sysctl_panic_on_rcu_stall), | |
2423 | .mode = 0644, | |
2424 | .proc_handler = proc_dointvec_minmax, | |
2425 | .extra1 = SYSCTL_ZERO, | |
2426 | .extra2 = SYSCTL_ONE, | |
2427 | }, | |
2428 | #endif | |
dfe56404 | 2429 | #if defined(CONFIG_TREE_RCU) |
2430 | { | |
2431 | .procname = "max_rcu_stall_to_panic", | |
2432 | .data = &sysctl_max_rcu_stall_to_panic, | |
2433 | .maxlen = sizeof(sysctl_max_rcu_stall_to_panic), | |
2434 | .mode = 0644, | |
2435 | .proc_handler = proc_dointvec_minmax, | |
2436 | .extra1 = SYSCTL_ONE, | |
2437 | .extra2 = SYSCTL_INT_MAX, | |
2438 | }, | |
f461d2dc CH |
2439 | #endif |
2440 | { } | |
2441 | }; | |
1da177e4 | 2442 | |
f461d2dc CH |
2443 | static struct ctl_table vm_table[] = { |
2444 | { | |
2445 | .procname = "overcommit_memory", | |
2446 | .data = &sysctl_overcommit_memory, | |
2447 | .maxlen = sizeof(sysctl_overcommit_memory), | |
2448 | .mode = 0644, | |
56f3547b | 2449 | .proc_handler = overcommit_policy_handler, |
f461d2dc | 2450 | .extra1 = SYSCTL_ZERO, |
78e36f3b | 2451 | .extra2 = SYSCTL_TWO, |
f461d2dc CH |
2452 | }, |
2453 | { | |
2454 | .procname = "panic_on_oom", | |
2455 | .data = &sysctl_panic_on_oom, | |
2456 | .maxlen = sizeof(sysctl_panic_on_oom), | |
2457 | .mode = 0644, | |
2458 | .proc_handler = proc_dointvec_minmax, | |
2459 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2460 | .extra2 = SYSCTL_TWO, |
f461d2dc CH |
2461 | }, |
2462 | { | |
2463 | .procname = "oom_kill_allocating_task", | |
2464 | .data = &sysctl_oom_kill_allocating_task, | |
2465 | .maxlen = sizeof(sysctl_oom_kill_allocating_task), | |
2466 | .mode = 0644, | |
2467 | .proc_handler = proc_dointvec, | |
2468 | }, | |
2469 | { | |
2470 | .procname = "oom_dump_tasks", | |
2471 | .data = &sysctl_oom_dump_tasks, | |
2472 | .maxlen = sizeof(sysctl_oom_dump_tasks), | |
2473 | .mode = 0644, | |
2474 | .proc_handler = proc_dointvec, | |
2475 | }, | |
2476 | { | |
2477 | .procname = "overcommit_ratio", | |
2478 | .data = &sysctl_overcommit_ratio, | |
2479 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
2480 | .mode = 0644, | |
2481 | .proc_handler = overcommit_ratio_handler, | |
2482 | }, | |
2483 | { | |
2484 | .procname = "overcommit_kbytes", | |
2485 | .data = &sysctl_overcommit_kbytes, | |
2486 | .maxlen = sizeof(sysctl_overcommit_kbytes), | |
2487 | .mode = 0644, | |
2488 | .proc_handler = overcommit_kbytes_handler, | |
2489 | }, | |
2490 | { | |
2491 | .procname = "page-cluster", | |
2492 | .data = &page_cluster, | |
2493 | .maxlen = sizeof(int), | |
2494 | .mode = 0644, | |
2495 | .proc_handler = proc_dointvec_minmax, | |
2496 | .extra1 = SYSCTL_ZERO, | |
2497 | }, | |
2498 | { | |
2499 | .procname = "dirty_background_ratio", | |
2500 | .data = &dirty_background_ratio, | |
2501 | .maxlen = sizeof(dirty_background_ratio), | |
2502 | .mode = 0644, | |
2503 | .proc_handler = dirty_background_ratio_handler, | |
2504 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2505 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2506 | }, |
2507 | { | |
2508 | .procname = "dirty_background_bytes", | |
2509 | .data = &dirty_background_bytes, | |
2510 | .maxlen = sizeof(dirty_background_bytes), | |
2511 | .mode = 0644, | |
2512 | .proc_handler = dirty_background_bytes_handler, | |
b1f2aff8 | 2513 | .extra1 = SYSCTL_LONG_ONE, |
f461d2dc CH |
2514 | }, |
2515 | { | |
2516 | .procname = "dirty_ratio", | |
2517 | .data = &vm_dirty_ratio, | |
2518 | .maxlen = sizeof(vm_dirty_ratio), | |
2519 | .mode = 0644, | |
2520 | .proc_handler = dirty_ratio_handler, | |
2521 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2522 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2523 | }, |
2524 | { | |
2525 | .procname = "dirty_bytes", | |
2526 | .data = &vm_dirty_bytes, | |
2527 | .maxlen = sizeof(vm_dirty_bytes), | |
2528 | .mode = 0644, | |
2529 | .proc_handler = dirty_bytes_handler, | |
d73840ec | 2530 | .extra1 = (void *)&dirty_bytes_min, |
f461d2dc CH |
2531 | }, |
2532 | { | |
2533 | .procname = "dirty_writeback_centisecs", | |
2534 | .data = &dirty_writeback_interval, | |
2535 | .maxlen = sizeof(dirty_writeback_interval), | |
2536 | .mode = 0644, | |
2537 | .proc_handler = dirty_writeback_centisecs_handler, | |
2538 | }, | |
2539 | { | |
2540 | .procname = "dirty_expire_centisecs", | |
2541 | .data = &dirty_expire_interval, | |
2542 | .maxlen = sizeof(dirty_expire_interval), | |
2543 | .mode = 0644, | |
2544 | .proc_handler = proc_dointvec_minmax, | |
2545 | .extra1 = SYSCTL_ZERO, | |
2546 | }, | |
2547 | { | |
2548 | .procname = "dirtytime_expire_seconds", | |
2549 | .data = &dirtytime_expire_interval, | |
2550 | .maxlen = sizeof(dirtytime_expire_interval), | |
2551 | .mode = 0644, | |
2552 | .proc_handler = dirtytime_interval_handler, | |
2553 | .extra1 = SYSCTL_ZERO, | |
2554 | }, | |
2555 | { | |
2556 | .procname = "swappiness", | |
2557 | .data = &vm_swappiness, | |
2558 | .maxlen = sizeof(vm_swappiness), | |
2559 | .mode = 0644, | |
2560 | .proc_handler = proc_dointvec_minmax, | |
2561 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2562 | .extra2 = SYSCTL_TWO_HUNDRED, |
f461d2dc CH |
2563 | }, |
2564 | #ifdef CONFIG_HUGETLB_PAGE | |
2565 | { | |
2566 | .procname = "nr_hugepages", | |
2567 | .data = NULL, | |
2568 | .maxlen = sizeof(unsigned long), | |
2569 | .mode = 0644, | |
2570 | .proc_handler = hugetlb_sysctl_handler, | |
2571 | }, | |
2572 | #ifdef CONFIG_NUMA | |
2573 | { | |
2574 | .procname = "nr_hugepages_mempolicy", | |
2575 | .data = NULL, | |
2576 | .maxlen = sizeof(unsigned long), | |
2577 | .mode = 0644, | |
2578 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
2579 | }, | |
2580 | { | |
2581 | .procname = "numa_stat", | |
2582 | .data = &sysctl_vm_numa_stat, | |
2583 | .maxlen = sizeof(int), | |
2584 | .mode = 0644, | |
2585 | .proc_handler = sysctl_vm_numa_stat_handler, | |
2586 | .extra1 = SYSCTL_ZERO, | |
2587 | .extra2 = SYSCTL_ONE, | |
2588 | }, | |
2589 | #endif | |
2590 | { | |
2591 | .procname = "hugetlb_shm_group", | |
2592 | .data = &sysctl_hugetlb_shm_group, | |
2593 | .maxlen = sizeof(gid_t), | |
2594 | .mode = 0644, | |
2595 | .proc_handler = proc_dointvec, | |
2596 | }, | |
2597 | { | |
2598 | .procname = "nr_overcommit_hugepages", | |
2599 | .data = NULL, | |
2600 | .maxlen = sizeof(unsigned long), | |
2601 | .mode = 0644, | |
2602 | .proc_handler = hugetlb_overcommit_handler, | |
2603 | }, | |
2604 | #endif | |
2605 | { | |
2606 | .procname = "lowmem_reserve_ratio", | |
2607 | .data = &sysctl_lowmem_reserve_ratio, | |
2608 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
2609 | .mode = 0644, | |
2610 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, | |
2611 | }, | |
2612 | { | |
2613 | .procname = "drop_caches", | |
2614 | .data = &sysctl_drop_caches, | |
2615 | .maxlen = sizeof(int), | |
2616 | .mode = 0200, | |
2617 | .proc_handler = drop_caches_sysctl_handler, | |
2618 | .extra1 = SYSCTL_ONE, | |
78e36f3b | 2619 | .extra2 = SYSCTL_FOUR, |
f461d2dc CH |
2620 | }, |
2621 | #ifdef CONFIG_COMPACTION | |
2622 | { | |
2623 | .procname = "compact_memory", | |
ef498438 | 2624 | .data = NULL, |
f461d2dc CH |
2625 | .maxlen = sizeof(int), |
2626 | .mode = 0200, | |
2627 | .proc_handler = sysctl_compaction_handler, | |
2628 | }, | |
facdaa91 NG |
2629 | { |
2630 | .procname = "compaction_proactiveness", | |
2631 | .data = &sysctl_compaction_proactiveness, | |
d34c0a75 | 2632 | .maxlen = sizeof(sysctl_compaction_proactiveness), |
facdaa91 | 2633 | .mode = 0644, |
65d759c8 | 2634 | .proc_handler = compaction_proactiveness_sysctl_handler, |
facdaa91 | 2635 | .extra1 = SYSCTL_ZERO, |
78e36f3b | 2636 | .extra2 = SYSCTL_ONE_HUNDRED, |
facdaa91 | 2637 | }, |
f461d2dc CH |
2638 | { |
2639 | .procname = "extfrag_threshold", | |
2640 | .data = &sysctl_extfrag_threshold, | |
2641 | .maxlen = sizeof(int), | |
2642 | .mode = 0644, | |
2643 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 2644 | .extra1 = SYSCTL_ZERO, |
d73840ec | 2645 | .extra2 = (void *)&max_extfrag_threshold, |
f461d2dc CH |
2646 | }, |
2647 | { | |
2648 | .procname = "compact_unevictable_allowed", | |
2649 | .data = &sysctl_compact_unevictable_allowed, | |
2650 | .maxlen = sizeof(int), | |
2651 | .mode = 0644, | |
2652 | .proc_handler = proc_dointvec_minmax_warn_RT_change, | |
2653 | .extra1 = SYSCTL_ZERO, | |
2654 | .extra2 = SYSCTL_ONE, | |
2655 | }, | |
1da177e4 | 2656 | |
f461d2dc CH |
2657 | #endif /* CONFIG_COMPACTION */ |
2658 | { | |
2659 | .procname = "min_free_kbytes", | |
2660 | .data = &min_free_kbytes, | |
2661 | .maxlen = sizeof(min_free_kbytes), | |
2662 | .mode = 0644, | |
2663 | .proc_handler = min_free_kbytes_sysctl_handler, | |
2664 | .extra1 = SYSCTL_ZERO, | |
2665 | }, | |
2666 | { | |
2667 | .procname = "watermark_boost_factor", | |
2668 | .data = &watermark_boost_factor, | |
2669 | .maxlen = sizeof(watermark_boost_factor), | |
2670 | .mode = 0644, | |
2671 | .proc_handler = proc_dointvec_minmax, | |
2672 | .extra1 = SYSCTL_ZERO, | |
2673 | }, | |
2674 | { | |
2675 | .procname = "watermark_scale_factor", | |
2676 | .data = &watermark_scale_factor, | |
2677 | .maxlen = sizeof(watermark_scale_factor), | |
2678 | .mode = 0644, | |
2679 | .proc_handler = watermark_scale_factor_sysctl_handler, | |
2680 | .extra1 = SYSCTL_ONE, | |
78e36f3b | 2681 | .extra2 = SYSCTL_THREE_THOUSAND, |
f461d2dc CH |
2682 | }, |
2683 | { | |
74f44822 MG |
2684 | .procname = "percpu_pagelist_high_fraction", |
2685 | .data = &percpu_pagelist_high_fraction, | |
2686 | .maxlen = sizeof(percpu_pagelist_high_fraction), | |
f461d2dc | 2687 | .mode = 0644, |
74f44822 | 2688 | .proc_handler = percpu_pagelist_high_fraction_sysctl_handler, |
f461d2dc CH |
2689 | .extra1 = SYSCTL_ZERO, |
2690 | }, | |
5ef64cc8 LT |
2691 | { |
2692 | .procname = "page_lock_unfairness", | |
2693 | .data = &sysctl_page_lock_unfairness, | |
2694 | .maxlen = sizeof(sysctl_page_lock_unfairness), | |
2695 | .mode = 0644, | |
2696 | .proc_handler = proc_dointvec_minmax, | |
2697 | .extra1 = SYSCTL_ZERO, | |
2698 | }, | |
f461d2dc CH |
2699 | #ifdef CONFIG_MMU |
2700 | { | |
2701 | .procname = "max_map_count", | |
2702 | .data = &sysctl_max_map_count, | |
2703 | .maxlen = sizeof(sysctl_max_map_count), | |
2704 | .mode = 0644, | |
2705 | .proc_handler = proc_dointvec_minmax, | |
2706 | .extra1 = SYSCTL_ZERO, | |
2707 | }, | |
2708 | #else | |
2709 | { | |
2710 | .procname = "nr_trim_pages", | |
2711 | .data = &sysctl_nr_trim_pages, | |
2712 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
2713 | .mode = 0644, | |
2714 | .proc_handler = proc_dointvec_minmax, | |
2715 | .extra1 = SYSCTL_ZERO, | |
2716 | }, | |
2717 | #endif | |
2718 | { | |
2719 | .procname = "laptop_mode", | |
2720 | .data = &laptop_mode, | |
2721 | .maxlen = sizeof(laptop_mode), | |
2722 | .mode = 0644, | |
2723 | .proc_handler = proc_dointvec_jiffies, | |
2724 | }, | |
f461d2dc CH |
2725 | { |
2726 | .procname = "vfs_cache_pressure", | |
2727 | .data = &sysctl_vfs_cache_pressure, | |
2728 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
2729 | .mode = 0644, | |
3b3376f2 | 2730 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2731 | .extra1 = SYSCTL_ZERO, |
2732 | }, | |
2733 | #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ | |
2734 | defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) | |
2735 | { | |
2736 | .procname = "legacy_va_layout", | |
2737 | .data = &sysctl_legacy_va_layout, | |
2738 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
2739 | .mode = 0644, | |
3b3376f2 | 2740 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2741 | .extra1 = SYSCTL_ZERO, |
2742 | }, | |
2743 | #endif | |
2744 | #ifdef CONFIG_NUMA | |
2745 | { | |
2746 | .procname = "zone_reclaim_mode", | |
2747 | .data = &node_reclaim_mode, | |
2748 | .maxlen = sizeof(node_reclaim_mode), | |
2749 | .mode = 0644, | |
3b3376f2 | 2750 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2751 | .extra1 = SYSCTL_ZERO, |
2752 | }, | |
2753 | { | |
2754 | .procname = "min_unmapped_ratio", | |
2755 | .data = &sysctl_min_unmapped_ratio, | |
2756 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
2757 | .mode = 0644, | |
2758 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, | |
2759 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2760 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2761 | }, |
2762 | { | |
2763 | .procname = "min_slab_ratio", | |
2764 | .data = &sysctl_min_slab_ratio, | |
2765 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
2766 | .mode = 0644, | |
2767 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, | |
2768 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2769 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2770 | }, |
2771 | #endif | |
2772 | #ifdef CONFIG_SMP | |
2773 | { | |
2774 | .procname = "stat_interval", | |
2775 | .data = &sysctl_stat_interval, | |
2776 | .maxlen = sizeof(sysctl_stat_interval), | |
2777 | .mode = 0644, | |
2778 | .proc_handler = proc_dointvec_jiffies, | |
2779 | }, | |
2780 | { | |
2781 | .procname = "stat_refresh", | |
2782 | .data = NULL, | |
2783 | .maxlen = 0, | |
2784 | .mode = 0600, | |
2785 | .proc_handler = vmstat_refresh, | |
2786 | }, | |
2787 | #endif | |
2788 | #ifdef CONFIG_MMU | |
2789 | { | |
2790 | .procname = "mmap_min_addr", | |
2791 | .data = &dac_mmap_min_addr, | |
2792 | .maxlen = sizeof(unsigned long), | |
2793 | .mode = 0644, | |
2794 | .proc_handler = mmap_min_addr_handler, | |
2795 | }, | |
2796 | #endif | |
2797 | #ifdef CONFIG_NUMA | |
2798 | { | |
2799 | .procname = "numa_zonelist_order", | |
2800 | .data = &numa_zonelist_order, | |
2801 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
2802 | .mode = 0644, | |
2803 | .proc_handler = numa_zonelist_order_handler, | |
2804 | }, | |
2805 | #endif | |
2806 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ | |
2807 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
2808 | { | |
2809 | .procname = "vdso_enabled", | |
2810 | #ifdef CONFIG_X86_32 | |
2811 | .data = &vdso32_enabled, | |
2812 | .maxlen = sizeof(vdso32_enabled), | |
2813 | #else | |
2814 | .data = &vdso_enabled, | |
2815 | .maxlen = sizeof(vdso_enabled), | |
2816 | #endif | |
2817 | .mode = 0644, | |
2818 | .proc_handler = proc_dointvec, | |
2819 | .extra1 = SYSCTL_ZERO, | |
2820 | }, | |
2821 | #endif | |
2822 | #ifdef CONFIG_HIGHMEM | |
2823 | { | |
2824 | .procname = "highmem_is_dirtyable", | |
2825 | .data = &vm_highmem_is_dirtyable, | |
2826 | .maxlen = sizeof(vm_highmem_is_dirtyable), | |
2827 | .mode = 0644, | |
2828 | .proc_handler = proc_dointvec_minmax, | |
2829 | .extra1 = SYSCTL_ZERO, | |
2830 | .extra2 = SYSCTL_ONE, | |
2831 | }, | |
2832 | #endif | |
2833 | #ifdef CONFIG_MEMORY_FAILURE | |
2834 | { | |
2835 | .procname = "memory_failure_early_kill", | |
2836 | .data = &sysctl_memory_failure_early_kill, | |
2837 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
2838 | .mode = 0644, | |
2839 | .proc_handler = proc_dointvec_minmax, | |
2840 | .extra1 = SYSCTL_ZERO, | |
2841 | .extra2 = SYSCTL_ONE, | |
2842 | }, | |
2843 | { | |
2844 | .procname = "memory_failure_recovery", | |
2845 | .data = &sysctl_memory_failure_recovery, | |
2846 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
2847 | .mode = 0644, | |
2848 | .proc_handler = proc_dointvec_minmax, | |
2849 | .extra1 = SYSCTL_ZERO, | |
2850 | .extra2 = SYSCTL_ONE, | |
2851 | }, | |
2852 | #endif | |
2853 | { | |
2854 | .procname = "user_reserve_kbytes", | |
2855 | .data = &sysctl_user_reserve_kbytes, | |
2856 | .maxlen = sizeof(sysctl_user_reserve_kbytes), | |
2857 | .mode = 0644, | |
2858 | .proc_handler = proc_doulongvec_minmax, | |
2859 | }, | |
2860 | { | |
2861 | .procname = "admin_reserve_kbytes", | |
2862 | .data = &sysctl_admin_reserve_kbytes, | |
2863 | .maxlen = sizeof(sysctl_admin_reserve_kbytes), | |
2864 | .mode = 0644, | |
2865 | .proc_handler = proc_doulongvec_minmax, | |
2866 | }, | |
2867 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS | |
2868 | { | |
2869 | .procname = "mmap_rnd_bits", | |
2870 | .data = &mmap_rnd_bits, | |
2871 | .maxlen = sizeof(mmap_rnd_bits), | |
2872 | .mode = 0600, | |
2873 | .proc_handler = proc_dointvec_minmax, | |
2874 | .extra1 = (void *)&mmap_rnd_bits_min, | |
2875 | .extra2 = (void *)&mmap_rnd_bits_max, | |
2876 | }, | |
2877 | #endif | |
2878 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
2879 | { | |
2880 | .procname = "mmap_rnd_compat_bits", | |
2881 | .data = &mmap_rnd_compat_bits, | |
2882 | .maxlen = sizeof(mmap_rnd_compat_bits), | |
2883 | .mode = 0600, | |
2884 | .proc_handler = proc_dointvec_minmax, | |
2885 | .extra1 = (void *)&mmap_rnd_compat_bits_min, | |
2886 | .extra2 = (void *)&mmap_rnd_compat_bits_max, | |
2887 | }, | |
2888 | #endif | |
2889 | #ifdef CONFIG_USERFAULTFD | |
2890 | { | |
2891 | .procname = "unprivileged_userfaultfd", | |
2892 | .data = &sysctl_unprivileged_userfaultfd, | |
2893 | .maxlen = sizeof(sysctl_unprivileged_userfaultfd), | |
2894 | .mode = 0644, | |
2895 | .proc_handler = proc_dointvec_minmax, | |
2896 | .extra1 = SYSCTL_ZERO, | |
2897 | .extra2 = SYSCTL_ONE, | |
2898 | }, | |
2899 | #endif | |
2900 | { } | |
2901 | }; | |
1da177e4 | 2902 | |
f461d2dc | 2903 | static struct ctl_table fs_table[] = { |
f461d2dc CH |
2904 | { |
2905 | .procname = "overflowuid", | |
2906 | .data = &fs_overflowuid, | |
2907 | .maxlen = sizeof(int), | |
2908 | .mode = 0644, | |
2909 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 2910 | .extra1 = SYSCTL_ZERO, |
d73840ec | 2911 | .extra2 = (void *)&maxolduid, |
f461d2dc CH |
2912 | }, |
2913 | { | |
2914 | .procname = "overflowgid", | |
2915 | .data = &fs_overflowgid, | |
2916 | .maxlen = sizeof(int), | |
2917 | .mode = 0644, | |
2918 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 2919 | .extra1 = SYSCTL_ZERO, |
d73840ec | 2920 | .extra2 = (void *)&maxolduid, |
f461d2dc CH |
2921 | }, |
2922 | #ifdef CONFIG_FILE_LOCKING | |
2923 | { | |
2924 | .procname = "leases-enable", | |
2925 | .data = &leases_enable, | |
2926 | .maxlen = sizeof(int), | |
2927 | .mode = 0644, | |
2928 | .proc_handler = proc_dointvec, | |
2929 | }, | |
2930 | #endif | |
f461d2dc CH |
2931 | #ifdef CONFIG_MMU |
2932 | #ifdef CONFIG_FILE_LOCKING | |
2933 | { | |
2934 | .procname = "lease-break-time", | |
2935 | .data = &lease_break_time, | |
2936 | .maxlen = sizeof(int), | |
2937 | .mode = 0644, | |
2938 | .proc_handler = proc_dointvec, | |
2939 | }, | |
2940 | #endif | |
f461d2dc CH |
2941 | #endif |
2942 | { | |
2943 | .procname = "protected_symlinks", | |
2944 | .data = &sysctl_protected_symlinks, | |
2945 | .maxlen = sizeof(int), | |
2946 | .mode = 0600, | |
2947 | .proc_handler = proc_dointvec_minmax, | |
2948 | .extra1 = SYSCTL_ZERO, | |
2949 | .extra2 = SYSCTL_ONE, | |
2950 | }, | |
2951 | { | |
2952 | .procname = "protected_hardlinks", | |
2953 | .data = &sysctl_protected_hardlinks, | |
2954 | .maxlen = sizeof(int), | |
2955 | .mode = 0600, | |
2956 | .proc_handler = proc_dointvec_minmax, | |
2957 | .extra1 = SYSCTL_ZERO, | |
2958 | .extra2 = SYSCTL_ONE, | |
2959 | }, | |
2960 | { | |
2961 | .procname = "protected_fifos", | |
2962 | .data = &sysctl_protected_fifos, | |
2963 | .maxlen = sizeof(int), | |
2964 | .mode = 0600, | |
2965 | .proc_handler = proc_dointvec_minmax, | |
2966 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2967 | .extra2 = SYSCTL_TWO, |
f461d2dc CH |
2968 | }, |
2969 | { | |
2970 | .procname = "protected_regular", | |
2971 | .data = &sysctl_protected_regular, | |
2972 | .maxlen = sizeof(int), | |
2973 | .mode = 0600, | |
2974 | .proc_handler = proc_dointvec_minmax, | |
2975 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2976 | .extra2 = SYSCTL_TWO, |
f461d2dc CH |
2977 | }, |
2978 | { | |
2979 | .procname = "suid_dumpable", | |
2980 | .data = &suid_dumpable, | |
2981 | .maxlen = sizeof(int), | |
2982 | .mode = 0644, | |
2983 | .proc_handler = proc_dointvec_minmax_coredump, | |
2984 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2985 | .extra2 = SYSCTL_TWO, |
f461d2dc | 2986 | }, |
f461d2dc CH |
2987 | { |
2988 | .procname = "pipe-max-size", | |
2989 | .data = &pipe_max_size, | |
2990 | .maxlen = sizeof(pipe_max_size), | |
2991 | .mode = 0644, | |
2992 | .proc_handler = proc_dopipe_max_size, | |
2993 | }, | |
2994 | { | |
2995 | .procname = "pipe-user-pages-hard", | |
2996 | .data = &pipe_user_pages_hard, | |
2997 | .maxlen = sizeof(pipe_user_pages_hard), | |
2998 | .mode = 0644, | |
2999 | .proc_handler = proc_doulongvec_minmax, | |
3000 | }, | |
3001 | { | |
3002 | .procname = "pipe-user-pages-soft", | |
3003 | .data = &pipe_user_pages_soft, | |
3004 | .maxlen = sizeof(pipe_user_pages_soft), | |
3005 | .mode = 0644, | |
3006 | .proc_handler = proc_doulongvec_minmax, | |
3007 | }, | |
3008 | { | |
3009 | .procname = "mount-max", | |
3010 | .data = &sysctl_mount_max, | |
3011 | .maxlen = sizeof(unsigned int), | |
3012 | .mode = 0644, | |
3013 | .proc_handler = proc_dointvec_minmax, | |
3014 | .extra1 = SYSCTL_ONE, | |
3015 | }, | |
3016 | { } | |
3017 | }; | |
1da177e4 | 3018 | |
f461d2dc CH |
3019 | static struct ctl_table debug_table[] = { |
3020 | #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE | |
3021 | { | |
3022 | .procname = "exception-trace", | |
3023 | .data = &show_unhandled_signals, | |
3024 | .maxlen = sizeof(int), | |
3025 | .mode = 0644, | |
3026 | .proc_handler = proc_dointvec | |
3027 | }, | |
3028 | #endif | |
3029 | #if defined(CONFIG_OPTPROBES) | |
3030 | { | |
3031 | .procname = "kprobes-optimization", | |
3032 | .data = &sysctl_kprobes_optimization, | |
3033 | .maxlen = sizeof(int), | |
3034 | .mode = 0644, | |
3035 | .proc_handler = proc_kprobes_optimization_handler, | |
3036 | .extra1 = SYSCTL_ZERO, | |
3037 | .extra2 = SYSCTL_ONE, | |
3038 | }, | |
3039 | #endif | |
3040 | { } | |
3041 | }; | |
1da177e4 | 3042 | |
f461d2dc CH |
3043 | static struct ctl_table dev_table[] = { |
3044 | { } | |
3045 | }; | |
1da177e4 | 3046 | |
f461d2dc CH |
3047 | static struct ctl_table sysctl_base_table[] = { |
3048 | { | |
3049 | .procname = "kernel", | |
3050 | .mode = 0555, | |
3051 | .child = kern_table, | |
3052 | }, | |
3053 | { | |
3054 | .procname = "vm", | |
3055 | .mode = 0555, | |
3056 | .child = vm_table, | |
3057 | }, | |
3058 | { | |
3059 | .procname = "fs", | |
3060 | .mode = 0555, | |
3061 | .child = fs_table, | |
3062 | }, | |
3063 | { | |
3064 | .procname = "debug", | |
3065 | .mode = 0555, | |
3066 | .child = debug_table, | |
3067 | }, | |
3068 | { | |
3069 | .procname = "dev", | |
3070 | .mode = 0555, | |
3071 | .child = dev_table, | |
3072 | }, | |
3073 | { } | |
3074 | }; | |
1da177e4 | 3075 | |
f461d2dc | 3076 | int __init sysctl_init(void) |
492ecee8 | 3077 | { |
f461d2dc | 3078 | struct ctl_table_header *hdr; |
492ecee8 | 3079 | |
f461d2dc CH |
3080 | hdr = register_sysctl_table(sysctl_base_table); |
3081 | kmemleak_not_leak(hdr); | |
3082 | return 0; | |
492ecee8 | 3083 | } |
f461d2dc | 3084 | #endif /* CONFIG_SYSCTL */ |
1da177e4 LT |
3085 | /* |
3086 | * No sense putting this after each symbol definition, twice, | |
3087 | * exception granted :-) | |
3088 | */ | |
a2071573 | 3089 | EXPORT_SYMBOL(proc_dobool); |
1da177e4 | 3090 | EXPORT_SYMBOL(proc_dointvec); |
e7d316a0 | 3091 | EXPORT_SYMBOL(proc_douintvec); |
1da177e4 LT |
3092 | EXPORT_SYMBOL(proc_dointvec_jiffies); |
3093 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
61d9b56a | 3094 | EXPORT_SYMBOL_GPL(proc_douintvec_minmax); |
1da177e4 LT |
3095 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
3096 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
3097 | EXPORT_SYMBOL(proc_dostring); | |
3098 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
3099 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
0bc19985 | 3100 | EXPORT_SYMBOL(proc_do_large_bitmap); |