Commit | Line | Data |
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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> |
8e4228e1 | 59 | #include <linux/oom.h> |
17f60a7d | 60 | #include <linux/kmod.h> |
73efc039 | 61 | #include <linux/capability.h> |
40401530 | 62 | #include <linux/binfmts.h> |
cf4aebc2 | 63 | #include <linux/sched/sysctl.h> |
d2921684 | 64 | #include <linux/mount.h> |
cefdca0a | 65 | #include <linux/userfaultfd_k.h> |
2374c09b | 66 | #include <linux/pid.h> |
1da177e4 | 67 | |
7f2923c4 CB |
68 | #include "../lib/kstrtox.h" |
69 | ||
7c0f6ba6 | 70 | #include <linux/uaccess.h> |
1da177e4 LT |
71 | #include <asm/processor.h> |
72 | ||
29cbc78b AK |
73 | #ifdef CONFIG_X86 |
74 | #include <asm/nmi.h> | |
0741f4d2 | 75 | #include <asm/stacktrace.h> |
6e7c4025 | 76 | #include <asm/io.h> |
29cbc78b | 77 | #endif |
d550bbd4 DH |
78 | #ifdef CONFIG_SPARC |
79 | #include <asm/setup.h> | |
80 | #endif | |
4f0e056f DY |
81 | #ifdef CONFIG_RT_MUTEXES |
82 | #include <linux/rtmutex.h> | |
83 | #endif | |
504d7cf1 | 84 | |
b13bc7cb LS |
85 | /* shared constants to be used in various sysctls */ |
86 | const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 }; | |
87 | EXPORT_SYMBOL(sysctl_vals); | |
88 | ||
89 | const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX }; | |
90 | EXPORT_SYMBOL_GPL(sysctl_long_vals); | |
91 | ||
1da177e4 LT |
92 | #if defined(CONFIG_SYSCTL) |
93 | ||
b13bc7cb | 94 | /* Constants used for minimum and maximum */ |
c4f3b63f | 95 | |
c5dfd78e | 96 | #ifdef CONFIG_PERF_EVENTS |
d73840ec | 97 | static const int six_hundred_forty_kb = 640 * 1024; |
c5dfd78e | 98 | #endif |
c4f3b63f | 99 | |
9e4a5bda | 100 | |
f628867d | 101 | static const int ngroups_max = NGROUPS_MAX; |
73efc039 | 102 | static const int cap_last_cap = CAP_LAST_CAP; |
1da177e4 | 103 | |
d6f8ff73 | 104 | #ifdef CONFIG_PROC_SYSCTL |
f4aacea2 | 105 | |
a19ac337 LR |
106 | /** |
107 | * enum sysctl_writes_mode - supported sysctl write modes | |
108 | * | |
109 | * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value | |
65f50f25 WH |
110 | * to be written, and multiple writes on the same sysctl file descriptor |
111 | * will rewrite the sysctl value, regardless of file position. No warning | |
112 | * is issued when the initial position is not 0. | |
a19ac337 | 113 | * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is |
65f50f25 | 114 | * not 0. |
a19ac337 | 115 | * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at |
65f50f25 WH |
116 | * file position 0 and the value must be fully contained in the buffer |
117 | * sent to the write syscall. If dealing with strings respect the file | |
118 | * position, but restrict this to the max length of the buffer, anything | |
119 | * passed the max length will be ignored. Multiple writes will append | |
120 | * to the buffer. | |
a19ac337 LR |
121 | * |
122 | * These write modes control how current file position affects the behavior of | |
123 | * updating sysctl values through the proc interface on each write. | |
124 | */ | |
125 | enum sysctl_writes_mode { | |
126 | SYSCTL_WRITES_LEGACY = -1, | |
127 | SYSCTL_WRITES_WARN = 0, | |
128 | SYSCTL_WRITES_STRICT = 1, | |
129 | }; | |
f4aacea2 | 130 | |
a19ac337 | 131 | static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; |
f461d2dc | 132 | #endif /* CONFIG_PROC_SYSCTL */ |
ceb18132 | 133 | |
67f3977f AG |
134 | #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ |
135 | defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) | |
1da177e4 LT |
136 | int sysctl_legacy_va_layout; |
137 | #endif | |
138 | ||
f461d2dc CH |
139 | #endif /* CONFIG_SYSCTL */ |
140 | ||
141 | /* | |
142 | * /proc/sys support | |
143 | */ | |
144 | ||
b89a8171 | 145 | #ifdef CONFIG_PROC_SYSCTL |
1da177e4 | 146 | |
f8808300 | 147 | static int _proc_do_string(char *data, int maxlen, int write, |
32927393 | 148 | char *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
149 | { |
150 | size_t len; | |
32927393 | 151 | char c, *p; |
8d060877 ON |
152 | |
153 | if (!data || !maxlen || !*lenp) { | |
1da177e4 LT |
154 | *lenp = 0; |
155 | return 0; | |
156 | } | |
8d060877 | 157 | |
1da177e4 | 158 | if (write) { |
f4aacea2 KC |
159 | if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { |
160 | /* Only continue writes not past the end of buffer. */ | |
161 | len = strlen(data); | |
162 | if (len > maxlen - 1) | |
163 | len = maxlen - 1; | |
164 | ||
165 | if (*ppos > len) | |
166 | return 0; | |
167 | len = *ppos; | |
168 | } else { | |
169 | /* Start writing from beginning of buffer. */ | |
170 | len = 0; | |
171 | } | |
172 | ||
2ca9bb45 | 173 | *ppos += *lenp; |
1da177e4 | 174 | p = buffer; |
2ca9bb45 | 175 | while ((p - buffer) < *lenp && len < maxlen - 1) { |
32927393 | 176 | c = *(p++); |
1da177e4 LT |
177 | if (c == 0 || c == '\n') |
178 | break; | |
2ca9bb45 | 179 | data[len++] = c; |
1da177e4 | 180 | } |
f8808300 | 181 | data[len] = 0; |
1da177e4 | 182 | } else { |
f5dd3d6f SV |
183 | len = strlen(data); |
184 | if (len > maxlen) | |
185 | len = maxlen; | |
8d060877 ON |
186 | |
187 | if (*ppos > len) { | |
188 | *lenp = 0; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | data += *ppos; | |
193 | len -= *ppos; | |
194 | ||
1da177e4 LT |
195 | if (len > *lenp) |
196 | len = *lenp; | |
197 | if (len) | |
32927393 | 198 | memcpy(buffer, data, len); |
1da177e4 | 199 | if (len < *lenp) { |
32927393 | 200 | buffer[len] = '\n'; |
1da177e4 LT |
201 | len++; |
202 | } | |
203 | *lenp = len; | |
204 | *ppos += len; | |
205 | } | |
206 | return 0; | |
207 | } | |
208 | ||
f4aacea2 KC |
209 | static void warn_sysctl_write(struct ctl_table *table) |
210 | { | |
211 | pr_warn_once("%s wrote to %s when file position was not 0!\n" | |
212 | "This will not be supported in the future. To silence this\n" | |
213 | "warning, set kernel.sysctl_writes_strict = -1\n", | |
214 | current->comm, table->procname); | |
215 | } | |
216 | ||
d383d484 | 217 | /** |
5f733e8a | 218 | * proc_first_pos_non_zero_ignore - check if first position is allowed |
d383d484 LR |
219 | * @ppos: file position |
220 | * @table: the sysctl table | |
221 | * | |
222 | * Returns true if the first position is non-zero and the sysctl_writes_strict | |
223 | * mode indicates this is not allowed for numeric input types. String proc | |
5f733e8a | 224 | * handlers can ignore the return value. |
d383d484 LR |
225 | */ |
226 | static bool proc_first_pos_non_zero_ignore(loff_t *ppos, | |
227 | struct ctl_table *table) | |
228 | { | |
229 | if (!*ppos) | |
230 | return false; | |
231 | ||
232 | switch (sysctl_writes_strict) { | |
233 | case SYSCTL_WRITES_STRICT: | |
234 | return true; | |
235 | case SYSCTL_WRITES_WARN: | |
236 | warn_sysctl_write(table); | |
237 | return false; | |
238 | default: | |
239 | return false; | |
240 | } | |
241 | } | |
242 | ||
f5dd3d6f SV |
243 | /** |
244 | * proc_dostring - read a string sysctl | |
245 | * @table: the sysctl table | |
246 | * @write: %TRUE if this is a write to the sysctl file | |
f5dd3d6f SV |
247 | * @buffer: the user buffer |
248 | * @lenp: the size of the user buffer | |
249 | * @ppos: file position | |
250 | * | |
251 | * Reads/writes a string from/to the user buffer. If the kernel | |
252 | * buffer provided is not large enough to hold the string, the | |
253 | * string is truncated. The copied string is %NULL-terminated. | |
254 | * If the string is being read by the user process, it is copied | |
255 | * and a newline '\n' is added. It is truncated if the buffer is | |
256 | * not large enough. | |
257 | * | |
258 | * Returns 0 on success. | |
259 | */ | |
8d65af78 | 260 | int proc_dostring(struct ctl_table *table, int write, |
32927393 | 261 | void *buffer, size_t *lenp, loff_t *ppos) |
f5dd3d6f | 262 | { |
d383d484 LR |
263 | if (write) |
264 | proc_first_pos_non_zero_ignore(ppos, table); | |
f4aacea2 | 265 | |
32927393 CH |
266 | return _proc_do_string(table->data, table->maxlen, write, buffer, lenp, |
267 | ppos); | |
f5dd3d6f SV |
268 | } |
269 | ||
bce93322 | 270 | static void proc_skip_spaces(char **buf, size_t *size) |
00b7c339 | 271 | { |
bce93322 LT |
272 | while (*size) { |
273 | if (!isspace(**buf)) | |
274 | break; | |
275 | (*size)--; | |
276 | (*buf)++; | |
277 | } | |
00b7c339 AW |
278 | } |
279 | ||
9f977fb7 OP |
280 | static void proc_skip_char(char **buf, size_t *size, const char v) |
281 | { | |
282 | while (*size) { | |
283 | if (**buf != v) | |
284 | break; | |
285 | (*size)--; | |
286 | (*buf)++; | |
287 | } | |
288 | } | |
289 | ||
7f2923c4 CB |
290 | /** |
291 | * strtoul_lenient - parse an ASCII formatted integer from a buffer and only | |
292 | * fail on overflow | |
293 | * | |
294 | * @cp: kernel buffer containing the string to parse | |
295 | * @endp: pointer to store the trailing characters | |
296 | * @base: the base to use | |
297 | * @res: where the parsed integer will be stored | |
298 | * | |
299 | * In case of success 0 is returned and @res will contain the parsed integer, | |
300 | * @endp will hold any trailing characters. | |
301 | * This function will fail the parse on overflow. If there wasn't an overflow | |
302 | * the function will defer the decision what characters count as invalid to the | |
303 | * caller. | |
304 | */ | |
305 | static int strtoul_lenient(const char *cp, char **endp, unsigned int base, | |
306 | unsigned long *res) | |
307 | { | |
308 | unsigned long long result; | |
309 | unsigned int rv; | |
310 | ||
311 | cp = _parse_integer_fixup_radix(cp, &base); | |
312 | rv = _parse_integer(cp, base, &result); | |
313 | if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result)) | |
314 | return -ERANGE; | |
315 | ||
316 | cp += rv; | |
317 | ||
318 | if (endp) | |
319 | *endp = (char *)cp; | |
320 | ||
321 | *res = (unsigned long)result; | |
322 | return 0; | |
323 | } | |
324 | ||
00b7c339 AW |
325 | #define TMPBUFLEN 22 |
326 | /** | |
0fc377bd | 327 | * proc_get_long - reads an ASCII formatted integer from a user buffer |
00b7c339 | 328 | * |
0fc377bd RD |
329 | * @buf: a kernel buffer |
330 | * @size: size of the kernel buffer | |
331 | * @val: this is where the number will be stored | |
332 | * @neg: set to %TRUE if number is negative | |
333 | * @perm_tr: a vector which contains the allowed trailers | |
334 | * @perm_tr_len: size of the perm_tr vector | |
335 | * @tr: pointer to store the trailer character | |
00b7c339 | 336 | * |
0fc377bd RD |
337 | * In case of success %0 is returned and @buf and @size are updated with |
338 | * the amount of bytes read. If @tr is non-NULL and a trailing | |
339 | * character exists (size is non-zero after returning from this | |
340 | * function), @tr is updated with the trailing character. | |
00b7c339 AW |
341 | */ |
342 | static int proc_get_long(char **buf, size_t *size, | |
343 | unsigned long *val, bool *neg, | |
344 | const char *perm_tr, unsigned perm_tr_len, char *tr) | |
345 | { | |
00b7c339 | 346 | char *p, tmp[TMPBUFLEN]; |
e6cfaf34 | 347 | ssize_t len = *size; |
00b7c339 | 348 | |
e6cfaf34 | 349 | if (len <= 0) |
00b7c339 AW |
350 | return -EINVAL; |
351 | ||
00b7c339 AW |
352 | if (len > TMPBUFLEN - 1) |
353 | len = TMPBUFLEN - 1; | |
354 | ||
355 | memcpy(tmp, *buf, len); | |
356 | ||
357 | tmp[len] = 0; | |
358 | p = tmp; | |
359 | if (*p == '-' && *size > 1) { | |
360 | *neg = true; | |
361 | p++; | |
362 | } else | |
363 | *neg = false; | |
364 | if (!isdigit(*p)) | |
365 | return -EINVAL; | |
366 | ||
7f2923c4 CB |
367 | if (strtoul_lenient(p, &p, 0, val)) |
368 | return -EINVAL; | |
00b7c339 AW |
369 | |
370 | len = p - tmp; | |
371 | ||
372 | /* We don't know if the next char is whitespace thus we may accept | |
373 | * invalid integers (e.g. 1234...a) or two integers instead of one | |
374 | * (e.g. 123...1). So lets not allow such large numbers. */ | |
375 | if (len == TMPBUFLEN - 1) | |
376 | return -EINVAL; | |
377 | ||
378 | if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) | |
379 | return -EINVAL; | |
1da177e4 | 380 | |
00b7c339 AW |
381 | if (tr && (len < *size)) |
382 | *tr = *p; | |
383 | ||
384 | *buf += len; | |
385 | *size -= len; | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | /** | |
0fc377bd | 391 | * proc_put_long - converts an integer to a decimal ASCII formatted string |
00b7c339 | 392 | * |
0fc377bd RD |
393 | * @buf: the user buffer |
394 | * @size: the size of the user buffer | |
395 | * @val: the integer to be converted | |
396 | * @neg: sign of the number, %TRUE for negative | |
00b7c339 | 397 | * |
32927393 CH |
398 | * In case of success @buf and @size are updated with the amount of bytes |
399 | * written. | |
00b7c339 | 400 | */ |
32927393 | 401 | static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg) |
00b7c339 AW |
402 | { |
403 | int len; | |
404 | char tmp[TMPBUFLEN], *p = tmp; | |
405 | ||
406 | sprintf(p, "%s%lu", neg ? "-" : "", val); | |
407 | len = strlen(tmp); | |
408 | if (len > *size) | |
409 | len = *size; | |
32927393 | 410 | memcpy(*buf, tmp, len); |
00b7c339 AW |
411 | *size -= len; |
412 | *buf += len; | |
00b7c339 AW |
413 | } |
414 | #undef TMPBUFLEN | |
415 | ||
32927393 | 416 | static void proc_put_char(void **buf, size_t *size, char c) |
00b7c339 AW |
417 | { |
418 | if (*size) { | |
32927393 CH |
419 | char **buffer = (char **)buf; |
420 | **buffer = c; | |
421 | ||
422 | (*size)--; | |
423 | (*buffer)++; | |
00b7c339 AW |
424 | *buf = *buffer; |
425 | } | |
00b7c339 | 426 | } |
1da177e4 | 427 | |
a2071573 JH |
428 | static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp, |
429 | int *valp, | |
430 | int write, void *data) | |
431 | { | |
432 | if (write) { | |
433 | *(bool *)valp = *lvalp; | |
434 | } else { | |
435 | int val = *(bool *)valp; | |
436 | ||
437 | *lvalp = (unsigned long)val; | |
438 | *negp = false; | |
439 | } | |
440 | return 0; | |
441 | } | |
442 | ||
00b7c339 | 443 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
444 | int *valp, |
445 | int write, void *data) | |
446 | { | |
447 | if (write) { | |
230633d1 HS |
448 | if (*negp) { |
449 | if (*lvalp > (unsigned long) INT_MAX + 1) | |
450 | return -EINVAL; | |
1f1be04b | 451 | WRITE_ONCE(*valp, -*lvalp); |
230633d1 HS |
452 | } else { |
453 | if (*lvalp > (unsigned long) INT_MAX) | |
454 | return -EINVAL; | |
1f1be04b | 455 | WRITE_ONCE(*valp, *lvalp); |
230633d1 | 456 | } |
1da177e4 | 457 | } else { |
1f1be04b | 458 | int val = READ_ONCE(*valp); |
1da177e4 | 459 | if (val < 0) { |
00b7c339 | 460 | *negp = true; |
9a5bc726 | 461 | *lvalp = -(unsigned long)val; |
1da177e4 | 462 | } else { |
00b7c339 | 463 | *negp = false; |
1da177e4 LT |
464 | *lvalp = (unsigned long)val; |
465 | } | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
4f2fec00 LR |
470 | static int do_proc_douintvec_conv(unsigned long *lvalp, |
471 | unsigned int *valp, | |
472 | int write, void *data) | |
e7d316a0 SAK |
473 | { |
474 | if (write) { | |
425fffd8 LZ |
475 | if (*lvalp > UINT_MAX) |
476 | return -EINVAL; | |
4762b532 | 477 | WRITE_ONCE(*valp, *lvalp); |
e7d316a0 | 478 | } else { |
4762b532 | 479 | unsigned int val = READ_ONCE(*valp); |
e7d316a0 SAK |
480 | *lvalp = (unsigned long)val; |
481 | } | |
482 | return 0; | |
483 | } | |
484 | ||
00b7c339 AW |
485 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
486 | ||
d8217f07 | 487 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
32927393 | 488 | int write, void *buffer, |
fcfbd547 | 489 | size_t *lenp, loff_t *ppos, |
00b7c339 | 490 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
1da177e4 LT |
491 | int write, void *data), |
492 | void *data) | |
493 | { | |
00b7c339 | 494 | int *i, vleft, first = 1, err = 0; |
00b7c339 | 495 | size_t left; |
32927393 | 496 | char *p; |
374a723c | 497 | |
00b7c339 | 498 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
1da177e4 LT |
499 | *lenp = 0; |
500 | return 0; | |
501 | } | |
374a723c | 502 | |
fcfbd547 | 503 | i = (int *) tbl_data; |
1da177e4 LT |
504 | vleft = table->maxlen / sizeof(*i); |
505 | left = *lenp; | |
506 | ||
507 | if (!conv) | |
508 | conv = do_proc_dointvec_conv; | |
509 | ||
00b7c339 | 510 | if (write) { |
d383d484 LR |
511 | if (proc_first_pos_non_zero_ignore(ppos, table)) |
512 | goto out; | |
f4aacea2 | 513 | |
00b7c339 AW |
514 | if (left > PAGE_SIZE - 1) |
515 | left = PAGE_SIZE - 1; | |
32927393 | 516 | p = buffer; |
00b7c339 AW |
517 | } |
518 | ||
1da177e4 | 519 | for (; left && vleft--; i++, first=0) { |
00b7c339 AW |
520 | unsigned long lval; |
521 | bool neg; | |
1da177e4 | 522 | |
00b7c339 | 523 | if (write) { |
bce93322 | 524 | proc_skip_spaces(&p, &left); |
1da177e4 | 525 | |
563b0467 O |
526 | if (!left) |
527 | break; | |
70f6cbb6 | 528 | err = proc_get_long(&p, &left, &lval, &neg, |
00b7c339 AW |
529 | proc_wspace_sep, |
530 | sizeof(proc_wspace_sep), NULL); | |
531 | if (err) | |
1da177e4 | 532 | break; |
00b7c339 AW |
533 | if (conv(&neg, &lval, i, 1, data)) { |
534 | err = -EINVAL; | |
1da177e4 | 535 | break; |
00b7c339 | 536 | } |
1da177e4 | 537 | } else { |
00b7c339 AW |
538 | if (conv(&neg, &lval, i, 0, data)) { |
539 | err = -EINVAL; | |
540 | break; | |
541 | } | |
1da177e4 | 542 | if (!first) |
32927393 CH |
543 | proc_put_char(&buffer, &left, '\t'); |
544 | proc_put_long(&buffer, &left, lval, neg); | |
1da177e4 LT |
545 | } |
546 | } | |
547 | ||
00b7c339 | 548 | if (!write && !first && left && !err) |
32927393 | 549 | proc_put_char(&buffer, &left, '\n'); |
563b0467 | 550 | if (write && !err && left) |
bce93322 | 551 | proc_skip_spaces(&p, &left); |
32927393 CH |
552 | if (write && first) |
553 | return err ? : -EINVAL; | |
1da177e4 | 554 | *lenp -= left; |
f4aacea2 | 555 | out: |
1da177e4 | 556 | *ppos += *lenp; |
00b7c339 | 557 | return err; |
1da177e4 LT |
558 | } |
559 | ||
8d65af78 | 560 | static int do_proc_dointvec(struct ctl_table *table, int write, |
32927393 | 561 | void *buffer, size_t *lenp, loff_t *ppos, |
00b7c339 | 562 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
fcfbd547 KK |
563 | int write, void *data), |
564 | void *data) | |
565 | { | |
8d65af78 | 566 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
567 | buffer, lenp, ppos, conv, data); |
568 | } | |
569 | ||
4f2fec00 LR |
570 | static int do_proc_douintvec_w(unsigned int *tbl_data, |
571 | struct ctl_table *table, | |
32927393 | 572 | void *buffer, |
4f2fec00 LR |
573 | size_t *lenp, loff_t *ppos, |
574 | int (*conv)(unsigned long *lvalp, | |
575 | unsigned int *valp, | |
576 | int write, void *data), | |
577 | void *data) | |
578 | { | |
579 | unsigned long lval; | |
580 | int err = 0; | |
581 | size_t left; | |
582 | bool neg; | |
32927393 | 583 | char *p = buffer; |
4f2fec00 LR |
584 | |
585 | left = *lenp; | |
586 | ||
587 | if (proc_first_pos_non_zero_ignore(ppos, table)) | |
588 | goto bail_early; | |
589 | ||
590 | if (left > PAGE_SIZE - 1) | |
591 | left = PAGE_SIZE - 1; | |
592 | ||
bce93322 | 593 | proc_skip_spaces(&p, &left); |
4f2fec00 LR |
594 | if (!left) { |
595 | err = -EINVAL; | |
596 | goto out_free; | |
597 | } | |
598 | ||
599 | err = proc_get_long(&p, &left, &lval, &neg, | |
600 | proc_wspace_sep, | |
601 | sizeof(proc_wspace_sep), NULL); | |
602 | if (err || neg) { | |
603 | err = -EINVAL; | |
604 | goto out_free; | |
605 | } | |
606 | ||
607 | if (conv(&lval, tbl_data, 1, data)) { | |
608 | err = -EINVAL; | |
609 | goto out_free; | |
610 | } | |
611 | ||
612 | if (!err && left) | |
bce93322 | 613 | proc_skip_spaces(&p, &left); |
4f2fec00 LR |
614 | |
615 | out_free: | |
4f2fec00 LR |
616 | if (err) |
617 | return -EINVAL; | |
618 | ||
619 | return 0; | |
620 | ||
621 | /* This is in keeping with old __do_proc_dointvec() */ | |
622 | bail_early: | |
623 | *ppos += *lenp; | |
624 | return err; | |
625 | } | |
626 | ||
32927393 | 627 | static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer, |
4f2fec00 LR |
628 | size_t *lenp, loff_t *ppos, |
629 | int (*conv)(unsigned long *lvalp, | |
630 | unsigned int *valp, | |
631 | int write, void *data), | |
632 | void *data) | |
633 | { | |
634 | unsigned long lval; | |
635 | int err = 0; | |
636 | size_t left; | |
637 | ||
638 | left = *lenp; | |
639 | ||
640 | if (conv(&lval, tbl_data, 0, data)) { | |
641 | err = -EINVAL; | |
642 | goto out; | |
643 | } | |
644 | ||
32927393 CH |
645 | proc_put_long(&buffer, &left, lval, false); |
646 | if (!left) | |
4f2fec00 LR |
647 | goto out; |
648 | ||
32927393 | 649 | proc_put_char(&buffer, &left, '\n'); |
4f2fec00 LR |
650 | |
651 | out: | |
652 | *lenp -= left; | |
653 | *ppos += *lenp; | |
654 | ||
655 | return err; | |
656 | } | |
657 | ||
658 | static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, | |
32927393 | 659 | int write, void *buffer, |
4f2fec00 LR |
660 | size_t *lenp, loff_t *ppos, |
661 | int (*conv)(unsigned long *lvalp, | |
662 | unsigned int *valp, | |
663 | int write, void *data), | |
664 | void *data) | |
665 | { | |
666 | unsigned int *i, vleft; | |
667 | ||
668 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
669 | *lenp = 0; | |
670 | return 0; | |
671 | } | |
672 | ||
673 | i = (unsigned int *) tbl_data; | |
674 | vleft = table->maxlen / sizeof(*i); | |
675 | ||
676 | /* | |
677 | * Arrays are not supported, keep this simple. *Do not* add | |
678 | * support for them. | |
679 | */ | |
680 | if (vleft != 1) { | |
681 | *lenp = 0; | |
682 | return -EINVAL; | |
683 | } | |
684 | ||
685 | if (!conv) | |
686 | conv = do_proc_douintvec_conv; | |
687 | ||
688 | if (write) | |
689 | return do_proc_douintvec_w(i, table, buffer, lenp, ppos, | |
690 | conv, data); | |
691 | return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); | |
692 | } | |
693 | ||
1998f193 LC |
694 | int do_proc_douintvec(struct ctl_table *table, int write, |
695 | void *buffer, size_t *lenp, loff_t *ppos, | |
696 | int (*conv)(unsigned long *lvalp, | |
697 | unsigned int *valp, | |
698 | int write, void *data), | |
699 | void *data) | |
4f2fec00 LR |
700 | { |
701 | return __do_proc_douintvec(table->data, table, write, | |
702 | buffer, lenp, ppos, conv, data); | |
703 | } | |
704 | ||
a2071573 JH |
705 | /** |
706 | * proc_dobool - read/write a bool | |
707 | * @table: the sysctl table | |
708 | * @write: %TRUE if this is a write to the sysctl file | |
709 | * @buffer: the user buffer | |
710 | * @lenp: the size of the user buffer | |
711 | * @ppos: file position | |
712 | * | |
713 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
714 | * values from/to the user buffer, treated as an ASCII string. | |
715 | * | |
716 | * Returns 0 on success. | |
717 | */ | |
718 | int proc_dobool(struct ctl_table *table, int write, void *buffer, | |
719 | size_t *lenp, loff_t *ppos) | |
720 | { | |
721 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
722 | do_proc_dobool_conv, NULL); | |
723 | } | |
724 | ||
1da177e4 LT |
725 | /** |
726 | * proc_dointvec - read a vector of integers | |
727 | * @table: the sysctl table | |
728 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
729 | * @buffer: the user buffer |
730 | * @lenp: the size of the user buffer | |
731 | * @ppos: file position | |
732 | * | |
733 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
374a723c | 734 | * values from/to the user buffer, treated as an ASCII string. |
1da177e4 LT |
735 | * |
736 | * Returns 0 on success. | |
737 | */ | |
32927393 CH |
738 | int proc_dointvec(struct ctl_table *table, int write, void *buffer, |
739 | size_t *lenp, loff_t *ppos) | |
1da177e4 | 740 | { |
e7d316a0 SAK |
741 | return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); |
742 | } | |
743 | ||
6923aa0d SAS |
744 | #ifdef CONFIG_COMPACTION |
745 | static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table, | |
32927393 | 746 | int write, void *buffer, size_t *lenp, loff_t *ppos) |
6923aa0d SAS |
747 | { |
748 | int ret, old; | |
749 | ||
750 | if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write) | |
751 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
752 | ||
753 | old = *(int *)table->data; | |
754 | ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
755 | if (ret) | |
756 | return ret; | |
757 | if (old != *(int *)table->data) | |
758 | pr_warn_once("sysctl attribute %s changed by %s[%d]\n", | |
759 | table->procname, current->comm, | |
760 | task_pid_nr(current)); | |
761 | return ret; | |
762 | } | |
763 | #endif | |
764 | ||
e7d316a0 SAK |
765 | /** |
766 | * proc_douintvec - read a vector of unsigned integers | |
767 | * @table: the sysctl table | |
768 | * @write: %TRUE if this is a write to the sysctl file | |
769 | * @buffer: the user buffer | |
770 | * @lenp: the size of the user buffer | |
771 | * @ppos: file position | |
772 | * | |
773 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
774 | * values from/to the user buffer, treated as an ASCII string. | |
775 | * | |
776 | * Returns 0 on success. | |
777 | */ | |
32927393 CH |
778 | int proc_douintvec(struct ctl_table *table, int write, void *buffer, |
779 | size_t *lenp, loff_t *ppos) | |
e7d316a0 | 780 | { |
4f2fec00 LR |
781 | return do_proc_douintvec(table, write, buffer, lenp, ppos, |
782 | do_proc_douintvec_conv, NULL); | |
1da177e4 LT |
783 | } |
784 | ||
34f5a398 | 785 | /* |
25ddbb18 AK |
786 | * Taint values can only be increased |
787 | * This means we can safely use a temporary. | |
34f5a398 | 788 | */ |
8d65af78 | 789 | static int proc_taint(struct ctl_table *table, int write, |
32927393 | 790 | void *buffer, size_t *lenp, loff_t *ppos) |
34f5a398 | 791 | { |
25ddbb18 AK |
792 | struct ctl_table t; |
793 | unsigned long tmptaint = get_taint(); | |
794 | int err; | |
34f5a398 | 795 | |
91fcd412 | 796 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
797 | return -EPERM; |
798 | ||
25ddbb18 AK |
799 | t = *table; |
800 | t.data = &tmptaint; | |
8d65af78 | 801 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
802 | if (err < 0) |
803 | return err; | |
804 | ||
805 | if (write) { | |
db38d5c1 RA |
806 | int i; |
807 | ||
808 | /* | |
809 | * If we are relying on panic_on_taint not producing | |
810 | * false positives due to userspace input, bail out | |
811 | * before setting the requested taint flags. | |
812 | */ | |
813 | if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint)) | |
814 | return -EINVAL; | |
815 | ||
25ddbb18 AK |
816 | /* |
817 | * Poor man's atomic or. Not worth adding a primitive | |
818 | * to everyone's atomic.h for this | |
819 | */ | |
e77132e7 RA |
820 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) |
821 | if ((1UL << i) & tmptaint) | |
373d4d09 | 822 | add_taint(i, LOCKDEP_STILL_OK); |
25ddbb18 AK |
823 | } |
824 | ||
825 | return err; | |
34f5a398 TT |
826 | } |
827 | ||
24704f36 WL |
828 | /** |
829 | * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure | |
830 | * @min: pointer to minimum allowable value | |
831 | * @max: pointer to maximum allowable value | |
832 | * | |
833 | * The do_proc_dointvec_minmax_conv_param structure provides the | |
834 | * minimum and maximum values for doing range checking for those sysctl | |
835 | * parameters that use the proc_dointvec_minmax() handler. | |
836 | */ | |
1da177e4 LT |
837 | struct do_proc_dointvec_minmax_conv_param { |
838 | int *min; | |
839 | int *max; | |
840 | }; | |
841 | ||
00b7c339 AW |
842 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
843 | int *valp, | |
1da177e4 LT |
844 | int write, void *data) |
845 | { | |
2bc4fc60 | 846 | int tmp, ret; |
1da177e4 | 847 | struct do_proc_dointvec_minmax_conv_param *param = data; |
2bc4fc60 ZW |
848 | /* |
849 | * If writing, first do so via a temporary local int so we can | |
850 | * bounds-check it before touching *valp. | |
851 | */ | |
852 | int *ip = write ? &tmp : valp; | |
853 | ||
854 | ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data); | |
855 | if (ret) | |
856 | return ret; | |
857 | ||
1da177e4 | 858 | if (write) { |
2bc4fc60 ZW |
859 | if ((param->min && *param->min > tmp) || |
860 | (param->max && *param->max < tmp)) | |
1da177e4 | 861 | return -EINVAL; |
f613d86d | 862 | WRITE_ONCE(*valp, tmp); |
1da177e4 | 863 | } |
2bc4fc60 | 864 | |
1da177e4 LT |
865 | return 0; |
866 | } | |
867 | ||
868 | /** | |
869 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
870 | * @table: the sysctl table | |
871 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
872 | * @buffer: the user buffer |
873 | * @lenp: the size of the user buffer | |
874 | * @ppos: file position | |
875 | * | |
876 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
877 | * values from/to the user buffer, treated as an ASCII string. | |
878 | * | |
879 | * This routine will ensure the values are within the range specified by | |
880 | * table->extra1 (min) and table->extra2 (max). | |
881 | * | |
24704f36 | 882 | * Returns 0 on success or -EINVAL on write when the range check fails. |
1da177e4 | 883 | */ |
8d65af78 | 884 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
32927393 | 885 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
886 | { |
887 | struct do_proc_dointvec_minmax_conv_param param = { | |
888 | .min = (int *) table->extra1, | |
889 | .max = (int *) table->extra2, | |
890 | }; | |
8d65af78 | 891 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
892 | do_proc_dointvec_minmax_conv, ¶m); |
893 | } | |
894 | ||
24704f36 WL |
895 | /** |
896 | * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure | |
897 | * @min: pointer to minimum allowable value | |
898 | * @max: pointer to maximum allowable value | |
899 | * | |
900 | * The do_proc_douintvec_minmax_conv_param structure provides the | |
901 | * minimum and maximum values for doing range checking for those sysctl | |
902 | * parameters that use the proc_douintvec_minmax() handler. | |
903 | */ | |
61d9b56a LR |
904 | struct do_proc_douintvec_minmax_conv_param { |
905 | unsigned int *min; | |
906 | unsigned int *max; | |
907 | }; | |
908 | ||
909 | static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, | |
910 | unsigned int *valp, | |
911 | int write, void *data) | |
912 | { | |
2bc4fc60 ZW |
913 | int ret; |
914 | unsigned int tmp; | |
61d9b56a | 915 | struct do_proc_douintvec_minmax_conv_param *param = data; |
2bc4fc60 ZW |
916 | /* write via temporary local uint for bounds-checking */ |
917 | unsigned int *up = write ? &tmp : valp; | |
61d9b56a | 918 | |
2bc4fc60 ZW |
919 | ret = do_proc_douintvec_conv(lvalp, up, write, data); |
920 | if (ret) | |
921 | return ret; | |
fb910c42 | 922 | |
2bc4fc60 ZW |
923 | if (write) { |
924 | if ((param->min && *param->min > tmp) || | |
925 | (param->max && *param->max < tmp)) | |
61d9b56a LR |
926 | return -ERANGE; |
927 | ||
2d3b559d | 928 | WRITE_ONCE(*valp, tmp); |
61d9b56a LR |
929 | } |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
934 | /** | |
935 | * proc_douintvec_minmax - read a vector of unsigned ints with min/max values | |
936 | * @table: the sysctl table | |
937 | * @write: %TRUE if this is a write to the sysctl file | |
938 | * @buffer: the user buffer | |
939 | * @lenp: the size of the user buffer | |
940 | * @ppos: file position | |
941 | * | |
942 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
943 | * values from/to the user buffer, treated as an ASCII string. Negative | |
944 | * strings are not allowed. | |
945 | * | |
946 | * This routine will ensure the values are within the range specified by | |
947 | * table->extra1 (min) and table->extra2 (max). There is a final sanity | |
948 | * check for UINT_MAX to avoid having to support wrap around uses from | |
949 | * userspace. | |
950 | * | |
24704f36 | 951 | * Returns 0 on success or -ERANGE on write when the range check fails. |
61d9b56a LR |
952 | */ |
953 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
32927393 | 954 | void *buffer, size_t *lenp, loff_t *ppos) |
61d9b56a LR |
955 | { |
956 | struct do_proc_douintvec_minmax_conv_param param = { | |
957 | .min = (unsigned int *) table->extra1, | |
958 | .max = (unsigned int *) table->extra2, | |
959 | }; | |
960 | return do_proc_douintvec(table, write, buffer, lenp, ppos, | |
961 | do_proc_douintvec_minmax_conv, ¶m); | |
962 | } | |
963 | ||
cb944413 ED |
964 | /** |
965 | * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values | |
966 | * @table: the sysctl table | |
967 | * @write: %TRUE if this is a write to the sysctl file | |
968 | * @buffer: the user buffer | |
969 | * @lenp: the size of the user buffer | |
970 | * @ppos: file position | |
971 | * | |
972 | * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars | |
973 | * values from/to the user buffer, treated as an ASCII string. Negative | |
974 | * strings are not allowed. | |
975 | * | |
976 | * This routine will ensure the values are within the range specified by | |
977 | * table->extra1 (min) and table->extra2 (max). | |
978 | * | |
979 | * Returns 0 on success or an error on write when the range check fails. | |
980 | */ | |
981 | int proc_dou8vec_minmax(struct ctl_table *table, int write, | |
982 | void *buffer, size_t *lenp, loff_t *ppos) | |
983 | { | |
984 | struct ctl_table tmp; | |
985 | unsigned int min = 0, max = 255U, val; | |
986 | u8 *data = table->data; | |
987 | struct do_proc_douintvec_minmax_conv_param param = { | |
988 | .min = &min, | |
989 | .max = &max, | |
990 | }; | |
991 | int res; | |
992 | ||
993 | /* Do not support arrays yet. */ | |
994 | if (table->maxlen != sizeof(u8)) | |
995 | return -EINVAL; | |
996 | ||
997 | if (table->extra1) { | |
998 | min = *(unsigned int *) table->extra1; | |
999 | if (min > 255U) | |
1000 | return -EINVAL; | |
1001 | } | |
1002 | if (table->extra2) { | |
1003 | max = *(unsigned int *) table->extra2; | |
1004 | if (max > 255U) | |
1005 | return -EINVAL; | |
1006 | } | |
1007 | ||
1008 | tmp = *table; | |
1009 | ||
1010 | tmp.maxlen = sizeof(val); | |
1011 | tmp.data = &val; | |
7dee5d77 | 1012 | val = READ_ONCE(*data); |
cb944413 ED |
1013 | res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos, |
1014 | do_proc_douintvec_minmax_conv, ¶m); | |
1015 | if (res) | |
1016 | return res; | |
1017 | if (write) | |
7dee5d77 | 1018 | WRITE_ONCE(*data, val); |
cb944413 ED |
1019 | return 0; |
1020 | } | |
1021 | EXPORT_SYMBOL_GPL(proc_dou8vec_minmax); | |
1022 | ||
eaee4172 DS |
1023 | #ifdef CONFIG_MAGIC_SYSRQ |
1024 | static int sysrq_sysctl_handler(struct ctl_table *table, int write, | |
32927393 | 1025 | void *buffer, size_t *lenp, loff_t *ppos) |
eaee4172 DS |
1026 | { |
1027 | int tmp, ret; | |
1028 | ||
1029 | tmp = sysrq_mask(); | |
1030 | ||
1031 | ret = __do_proc_dointvec(&tmp, table, write, buffer, | |
1032 | lenp, ppos, NULL, NULL); | |
1033 | if (ret || !write) | |
1034 | return ret; | |
1035 | ||
1036 | if (write) | |
1037 | sysrq_toggle_support(tmp); | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | #endif | |
1042 | ||
32927393 CH |
1043 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, |
1044 | int write, void *buffer, size_t *lenp, loff_t *ppos, | |
1045 | unsigned long convmul, unsigned long convdiv) | |
1da177e4 | 1046 | { |
00b7c339 AW |
1047 | unsigned long *i, *min, *max; |
1048 | int vleft, first = 1, err = 0; | |
00b7c339 | 1049 | size_t left; |
32927393 | 1050 | char *p; |
00b7c339 AW |
1051 | |
1052 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1da177e4 LT |
1053 | *lenp = 0; |
1054 | return 0; | |
1055 | } | |
00b7c339 | 1056 | |
8ebc4123 DC |
1057 | i = data; |
1058 | min = table->extra1; | |
1059 | max = table->extra2; | |
1da177e4 LT |
1060 | vleft = table->maxlen / sizeof(unsigned long); |
1061 | left = *lenp; | |
00b7c339 AW |
1062 | |
1063 | if (write) { | |
d383d484 LR |
1064 | if (proc_first_pos_non_zero_ignore(ppos, table)) |
1065 | goto out; | |
f4aacea2 | 1066 | |
00b7c339 AW |
1067 | if (left > PAGE_SIZE - 1) |
1068 | left = PAGE_SIZE - 1; | |
32927393 | 1069 | p = buffer; |
00b7c339 AW |
1070 | } |
1071 | ||
27b3d80a | 1072 | for (; left && vleft--; i++, first = 0) { |
00b7c339 AW |
1073 | unsigned long val; |
1074 | ||
1da177e4 | 1075 | if (write) { |
00b7c339 AW |
1076 | bool neg; |
1077 | ||
bce93322 | 1078 | proc_skip_spaces(&p, &left); |
09be1784 CL |
1079 | if (!left) |
1080 | break; | |
00b7c339 | 1081 | |
70f6cbb6 | 1082 | err = proc_get_long(&p, &left, &val, &neg, |
00b7c339 AW |
1083 | proc_wspace_sep, |
1084 | sizeof(proc_wspace_sep), NULL); | |
1622ed7d BL |
1085 | if (err || neg) { |
1086 | err = -EINVAL; | |
1da177e4 | 1087 | break; |
1622ed7d BL |
1088 | } |
1089 | ||
ff9f8a7c | 1090 | val = convmul * val / convdiv; |
e260ad01 CB |
1091 | if ((min && val < *min) || (max && val > *max)) { |
1092 | err = -EINVAL; | |
1093 | break; | |
1094 | } | |
c31bcc8f | 1095 | WRITE_ONCE(*i, val); |
1da177e4 | 1096 | } else { |
c31bcc8f | 1097 | val = convdiv * READ_ONCE(*i) / convmul; |
32927393 CH |
1098 | if (!first) |
1099 | proc_put_char(&buffer, &left, '\t'); | |
1100 | proc_put_long(&buffer, &left, val, false); | |
1da177e4 LT |
1101 | } |
1102 | } | |
1103 | ||
00b7c339 | 1104 | if (!write && !first && left && !err) |
32927393 | 1105 | proc_put_char(&buffer, &left, '\n'); |
00b7c339 | 1106 | if (write && !err) |
bce93322 | 1107 | proc_skip_spaces(&p, &left); |
32927393 CH |
1108 | if (write && first) |
1109 | return err ? : -EINVAL; | |
1da177e4 | 1110 | *lenp -= left; |
f4aacea2 | 1111 | out: |
1da177e4 | 1112 | *ppos += *lenp; |
00b7c339 | 1113 | return err; |
1da177e4 LT |
1114 | } |
1115 | ||
d8217f07 | 1116 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 CH |
1117 | void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul, |
1118 | unsigned long convdiv) | |
fcfbd547 KK |
1119 | { |
1120 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 1121 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
1122 | } |
1123 | ||
1da177e4 LT |
1124 | /** |
1125 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
1126 | * @table: the sysctl table | |
1127 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1128 | * @buffer: the user buffer |
1129 | * @lenp: the size of the user buffer | |
1130 | * @ppos: file position | |
1131 | * | |
1132 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1133 | * values from/to the user buffer, treated as an ASCII string. | |
1134 | * | |
1135 | * This routine will ensure the values are within the range specified by | |
1136 | * table->extra1 (min) and table->extra2 (max). | |
1137 | * | |
1138 | * Returns 0 on success. | |
1139 | */ | |
8d65af78 | 1140 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 | 1141 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1142 | { |
8d65af78 | 1143 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
1144 | } |
1145 | ||
1146 | /** | |
1147 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
1148 | * @table: the sysctl table | |
1149 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1150 | * @buffer: the user buffer |
1151 | * @lenp: the size of the user buffer | |
1152 | * @ppos: file position | |
1153 | * | |
1154 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1155 | * values from/to the user buffer, treated as an ASCII string. The values | |
1156 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
1157 | * | |
1158 | * This routine will ensure the values are within the range specified by | |
1159 | * table->extra1 (min) and table->extra2 (max). | |
1160 | * | |
1161 | * Returns 0 on success. | |
1162 | */ | |
d8217f07 | 1163 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
32927393 | 1164 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1165 | { |
8d65af78 | 1166 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
1167 | lenp, ppos, HZ, 1000l); |
1168 | } | |
1169 | ||
1170 | ||
00b7c339 | 1171 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1172 | int *valp, |
1173 | int write, void *data) | |
1174 | { | |
1175 | if (write) { | |
63259457 | 1176 | if (*lvalp > INT_MAX / HZ) |
cba9f33d | 1177 | return 1; |
e8778208 KI |
1178 | if (*negp) |
1179 | WRITE_ONCE(*valp, -*lvalp * HZ); | |
1180 | else | |
1181 | WRITE_ONCE(*valp, *lvalp * HZ); | |
1da177e4 | 1182 | } else { |
e8778208 | 1183 | int val = READ_ONCE(*valp); |
1da177e4 LT |
1184 | unsigned long lval; |
1185 | if (val < 0) { | |
00b7c339 | 1186 | *negp = true; |
9a5bc726 | 1187 | lval = -(unsigned long)val; |
1da177e4 | 1188 | } else { |
00b7c339 | 1189 | *negp = false; |
1da177e4 LT |
1190 | lval = (unsigned long)val; |
1191 | } | |
1192 | *lvalp = lval / HZ; | |
1193 | } | |
1194 | return 0; | |
1195 | } | |
1196 | ||
00b7c339 | 1197 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1198 | int *valp, |
1199 | int write, void *data) | |
1200 | { | |
1201 | if (write) { | |
cba9f33d BS |
1202 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
1203 | return 1; | |
1da177e4 LT |
1204 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
1205 | } else { | |
1206 | int val = *valp; | |
1207 | unsigned long lval; | |
1208 | if (val < 0) { | |
00b7c339 | 1209 | *negp = true; |
9a5bc726 | 1210 | lval = -(unsigned long)val; |
1da177e4 | 1211 | } else { |
00b7c339 | 1212 | *negp = false; |
1da177e4 LT |
1213 | lval = (unsigned long)val; |
1214 | } | |
1215 | *lvalp = jiffies_to_clock_t(lval); | |
1216 | } | |
1217 | return 0; | |
1218 | } | |
1219 | ||
00b7c339 | 1220 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1221 | int *valp, |
1222 | int write, void *data) | |
1223 | { | |
1224 | if (write) { | |
d738ce8f FF |
1225 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
1226 | ||
1227 | if (jif > INT_MAX) | |
1228 | return 1; | |
7d1025e5 | 1229 | WRITE_ONCE(*valp, (int)jif); |
1da177e4 | 1230 | } else { |
7d1025e5 | 1231 | int val = READ_ONCE(*valp); |
1da177e4 LT |
1232 | unsigned long lval; |
1233 | if (val < 0) { | |
00b7c339 | 1234 | *negp = true; |
9a5bc726 | 1235 | lval = -(unsigned long)val; |
1da177e4 | 1236 | } else { |
00b7c339 | 1237 | *negp = false; |
1da177e4 LT |
1238 | lval = (unsigned long)val; |
1239 | } | |
1240 | *lvalp = jiffies_to_msecs(lval); | |
1241 | } | |
1242 | return 0; | |
1243 | } | |
1244 | ||
c381d02b YW |
1245 | static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp, |
1246 | int *valp, int write, void *data) | |
1247 | { | |
1248 | int tmp, ret; | |
1249 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1250 | /* | |
1251 | * If writing, first do so via a temporary local int so we can | |
1252 | * bounds-check it before touching *valp. | |
1253 | */ | |
1254 | int *ip = write ? &tmp : valp; | |
1255 | ||
1256 | ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data); | |
1257 | if (ret) | |
1258 | return ret; | |
1259 | ||
1260 | if (write) { | |
1261 | if ((param->min && *param->min > tmp) || | |
1262 | (param->max && *param->max < tmp)) | |
1263 | return -EINVAL; | |
1264 | *valp = tmp; | |
1265 | } | |
1266 | return 0; | |
1267 | } | |
1268 | ||
1da177e4 LT |
1269 | /** |
1270 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
1271 | * @table: the sysctl table | |
1272 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1273 | * @buffer: the user buffer |
1274 | * @lenp: the size of the user buffer | |
1275 | * @ppos: file position | |
1276 | * | |
1277 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
374a723c | 1278 | * values from/to the user buffer, treated as an ASCII string. |
1da177e4 LT |
1279 | * The values read are assumed to be in seconds, and are converted into |
1280 | * jiffies. | |
1281 | * | |
1282 | * Returns 0 on success. | |
1283 | */ | |
8d65af78 | 1284 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
32927393 | 1285 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1286 | { |
8d65af78 | 1287 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
1288 | do_proc_dointvec_jiffies_conv,NULL); |
1289 | } | |
1290 | ||
c381d02b YW |
1291 | int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1292 | void *buffer, size_t *lenp, loff_t *ppos) | |
1293 | { | |
1294 | struct do_proc_dointvec_minmax_conv_param param = { | |
1295 | .min = (int *) table->extra1, | |
1296 | .max = (int *) table->extra2, | |
1297 | }; | |
1298 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
1299 | do_proc_dointvec_ms_jiffies_minmax_conv, ¶m); | |
1300 | } | |
1301 | ||
1da177e4 LT |
1302 | /** |
1303 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
1304 | * @table: the sysctl table | |
1305 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1306 | * @buffer: the user buffer |
1307 | * @lenp: the size of the user buffer | |
1e5d5331 | 1308 | * @ppos: pointer to the file position |
1da177e4 LT |
1309 | * |
1310 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
374a723c FK |
1311 | * values from/to the user buffer, treated as an ASCII string. |
1312 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
1da177e4 LT |
1313 | * are converted into jiffies. |
1314 | * | |
1315 | * Returns 0 on success. | |
1316 | */ | |
8d65af78 | 1317 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
32927393 | 1318 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1319 | { |
5bfd5d3e FK |
1320 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1321 | do_proc_dointvec_userhz_jiffies_conv, NULL); | |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | /** | |
1325 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
1326 | * @table: the sysctl table | |
1327 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1328 | * @buffer: the user buffer |
1329 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
1330 | * @ppos: file position |
1331 | * @ppos: the current position in the file | |
1da177e4 LT |
1332 | * |
1333 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
7d1025e5 KI |
1334 | * values from/to the user buffer, treated as an ASCII string. |
1335 | * The values read are assumed to be in 1/1000 seconds, and | |
1da177e4 LT |
1336 | * are converted into jiffies. |
1337 | * | |
1338 | * Returns 0 on success. | |
1339 | */ | |
32927393 CH |
1340 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer, |
1341 | size_t *lenp, loff_t *ppos) | |
1da177e4 | 1342 | { |
8d65af78 | 1343 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
1344 | do_proc_dointvec_ms_jiffies_conv, NULL); |
1345 | } | |
1346 | ||
32927393 CH |
1347 | static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer, |
1348 | size_t *lenp, loff_t *ppos) | |
9ec52099 CLG |
1349 | { |
1350 | struct pid *new_pid; | |
1351 | pid_t tmp; | |
1352 | int r; | |
1353 | ||
6c5f3e7b | 1354 | tmp = pid_vnr(cad_pid); |
9ec52099 | 1355 | |
8d65af78 | 1356 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
1357 | lenp, ppos, NULL, NULL); |
1358 | if (r || !write) | |
1359 | return r; | |
1360 | ||
1361 | new_pid = find_get_pid(tmp); | |
1362 | if (!new_pid) | |
1363 | return -ESRCH; | |
1364 | ||
1365 | put_pid(xchg(&cad_pid, new_pid)); | |
1366 | return 0; | |
1367 | } | |
1368 | ||
9f977fb7 OP |
1369 | /** |
1370 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
1371 | * @table: the sysctl table | |
1372 | * @write: %TRUE if this is a write to the sysctl file | |
1373 | * @buffer: the user buffer | |
1374 | * @lenp: the size of the user buffer | |
1375 | * @ppos: file position | |
1376 | * | |
1377 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
1378 | * in table->maxlen. | |
1379 | * | |
1380 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
1381 | * large bitmaps may be represented in a compact manner. Writing into | |
1382 | * the file will clear the bitmap then update it with the given input. | |
1383 | * | |
1384 | * Returns 0 on success. | |
1385 | */ | |
1386 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
32927393 | 1387 | void *buffer, size_t *lenp, loff_t *ppos) |
9f977fb7 OP |
1388 | { |
1389 | int err = 0; | |
9f977fb7 OP |
1390 | size_t left = *lenp; |
1391 | unsigned long bitmap_len = table->maxlen; | |
122ff243 | 1392 | unsigned long *bitmap = *(unsigned long **) table->data; |
9f977fb7 OP |
1393 | unsigned long *tmp_bitmap = NULL; |
1394 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
1395 | ||
122ff243 | 1396 | if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { |
9f977fb7 OP |
1397 | *lenp = 0; |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | if (write) { | |
32927393 | 1402 | char *p = buffer; |
3116ad38 | 1403 | size_t skipped = 0; |
9f977fb7 | 1404 | |
3116ad38 | 1405 | if (left > PAGE_SIZE - 1) { |
9f977fb7 | 1406 | left = PAGE_SIZE - 1; |
3116ad38 ES |
1407 | /* How much of the buffer we'll skip this pass */ |
1408 | skipped = *lenp - left; | |
1409 | } | |
9f977fb7 | 1410 | |
475dae38 | 1411 | tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL); |
32927393 | 1412 | if (!tmp_bitmap) |
9f977fb7 | 1413 | return -ENOMEM; |
70f6cbb6 | 1414 | proc_skip_char(&p, &left, '\n'); |
9f977fb7 OP |
1415 | while (!err && left) { |
1416 | unsigned long val_a, val_b; | |
1417 | bool neg; | |
3116ad38 | 1418 | size_t saved_left; |
9f977fb7 | 1419 | |
3116ad38 ES |
1420 | /* In case we stop parsing mid-number, we can reset */ |
1421 | saved_left = left; | |
70f6cbb6 | 1422 | err = proc_get_long(&p, &left, &val_a, &neg, tr_a, |
9f977fb7 | 1423 | sizeof(tr_a), &c); |
3116ad38 ES |
1424 | /* |
1425 | * If we consumed the entirety of a truncated buffer or | |
1426 | * only one char is left (may be a "-"), then stop here, | |
1427 | * reset, & come back for more. | |
1428 | */ | |
1429 | if ((left <= 1) && skipped) { | |
1430 | left = saved_left; | |
1431 | break; | |
1432 | } | |
1433 | ||
9f977fb7 OP |
1434 | if (err) |
1435 | break; | |
1436 | if (val_a >= bitmap_len || neg) { | |
1437 | err = -EINVAL; | |
1438 | break; | |
1439 | } | |
1440 | ||
1441 | val_b = val_a; | |
1442 | if (left) { | |
70f6cbb6 | 1443 | p++; |
9f977fb7 OP |
1444 | left--; |
1445 | } | |
1446 | ||
1447 | if (c == '-') { | |
70f6cbb6 | 1448 | err = proc_get_long(&p, &left, &val_b, |
9f977fb7 OP |
1449 | &neg, tr_b, sizeof(tr_b), |
1450 | &c); | |
3116ad38 ES |
1451 | /* |
1452 | * If we consumed all of a truncated buffer or | |
1453 | * then stop here, reset, & come back for more. | |
1454 | */ | |
1455 | if (!left && skipped) { | |
1456 | left = saved_left; | |
1457 | break; | |
1458 | } | |
1459 | ||
9f977fb7 OP |
1460 | if (err) |
1461 | break; | |
1462 | if (val_b >= bitmap_len || neg || | |
1463 | val_a > val_b) { | |
1464 | err = -EINVAL; | |
1465 | break; | |
1466 | } | |
1467 | if (left) { | |
70f6cbb6 | 1468 | p++; |
9f977fb7 OP |
1469 | left--; |
1470 | } | |
1471 | } | |
1472 | ||
5a04cca6 | 1473 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); |
70f6cbb6 | 1474 | proc_skip_char(&p, &left, '\n'); |
9f977fb7 | 1475 | } |
3116ad38 | 1476 | left += skipped; |
9f977fb7 OP |
1477 | } else { |
1478 | unsigned long bit_a, bit_b = 0; | |
9a52c5f3 | 1479 | bool first = 1; |
9f977fb7 OP |
1480 | |
1481 | while (left) { | |
1482 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
1483 | if (bit_a >= bitmap_len) | |
1484 | break; | |
1485 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
1486 | bit_a + 1) - 1; | |
1487 | ||
32927393 CH |
1488 | if (!first) |
1489 | proc_put_char(&buffer, &left, ','); | |
1490 | proc_put_long(&buffer, &left, bit_a, false); | |
9f977fb7 | 1491 | if (bit_a != bit_b) { |
32927393 CH |
1492 | proc_put_char(&buffer, &left, '-'); |
1493 | proc_put_long(&buffer, &left, bit_b, false); | |
9f977fb7 OP |
1494 | } |
1495 | ||
1496 | first = 0; bit_b++; | |
1497 | } | |
32927393 | 1498 | proc_put_char(&buffer, &left, '\n'); |
9f977fb7 OP |
1499 | } |
1500 | ||
1501 | if (!err) { | |
1502 | if (write) { | |
1503 | if (*ppos) | |
1504 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
1505 | else | |
5a04cca6 | 1506 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len); |
9f977fb7 | 1507 | } |
9f977fb7 OP |
1508 | *lenp -= left; |
1509 | *ppos += *lenp; | |
9f977fb7 | 1510 | } |
f9eb2fdd | 1511 | |
475dae38 | 1512 | bitmap_free(tmp_bitmap); |
f9eb2fdd | 1513 | return err; |
9f977fb7 OP |
1514 | } |
1515 | ||
55610500 | 1516 | #else /* CONFIG_PROC_SYSCTL */ |
1da177e4 | 1517 | |
8d65af78 | 1518 | int proc_dostring(struct ctl_table *table, int write, |
32927393 | 1519 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1520 | { |
1521 | return -ENOSYS; | |
1522 | } | |
1523 | ||
a2071573 JH |
1524 | int proc_dobool(struct ctl_table *table, int write, |
1525 | void *buffer, size_t *lenp, loff_t *ppos) | |
1526 | { | |
1527 | return -ENOSYS; | |
1528 | } | |
1529 | ||
f461d2dc | 1530 | int proc_dointvec(struct ctl_table *table, int write, |
32927393 | 1531 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1532 | { |
1533 | return -ENOSYS; | |
1534 | } | |
1535 | ||
1536 | int proc_douintvec(struct ctl_table *table, int write, | |
32927393 | 1537 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1538 | { |
1539 | return -ENOSYS; | |
1540 | } | |
1541 | ||
1542 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
32927393 | 1543 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1544 | { |
1545 | return -ENOSYS; | |
1546 | } | |
1547 | ||
1548 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
32927393 | 1549 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1550 | { |
1551 | return -ENOSYS; | |
9f977fb7 OP |
1552 | } |
1553 | ||
cb944413 ED |
1554 | int proc_dou8vec_minmax(struct ctl_table *table, int write, |
1555 | void *buffer, size_t *lenp, loff_t *ppos) | |
1556 | { | |
1557 | return -ENOSYS; | |
1558 | } | |
1559 | ||
f461d2dc | 1560 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
32927393 | 1561 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1562 | { |
1563 | return -ENOSYS; | |
1564 | } | |
1da177e4 | 1565 | |
c381d02b YW |
1566 | int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1567 | void *buffer, size_t *lenp, loff_t *ppos) | |
1568 | { | |
1569 | return -ENOSYS; | |
1570 | } | |
1571 | ||
f461d2dc | 1572 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
32927393 | 1573 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1574 | { |
1575 | return -ENOSYS; | |
1576 | } | |
1577 | ||
f461d2dc | 1578 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
32927393 | 1579 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1580 | { |
1581 | return -ENOSYS; | |
1582 | } | |
1583 | ||
f461d2dc | 1584 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 | 1585 | void *buffer, size_t *lenp, loff_t *ppos) |
e7d316a0 SAK |
1586 | { |
1587 | return -ENOSYS; | |
1588 | } | |
1589 | ||
f461d2dc | 1590 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
32927393 | 1591 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1592 | { |
32927393 | 1593 | return -ENOSYS; |
1da177e4 LT |
1594 | } |
1595 | ||
f461d2dc | 1596 | int proc_do_large_bitmap(struct ctl_table *table, int write, |
32927393 | 1597 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1598 | { |
1599 | return -ENOSYS; | |
1600 | } | |
1601 | ||
f461d2dc CH |
1602 | #endif /* CONFIG_PROC_SYSCTL */ |
1603 | ||
1604 | #if defined(CONFIG_SYSCTL) | |
1605 | int proc_do_static_key(struct ctl_table *table, int write, | |
32927393 | 1606 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1607 | { |
f461d2dc CH |
1608 | struct static_key *key = (struct static_key *)table->data; |
1609 | static DEFINE_MUTEX(static_key_mutex); | |
1610 | int val, ret; | |
1611 | struct ctl_table tmp = { | |
1612 | .data = &val, | |
1613 | .maxlen = sizeof(val), | |
1614 | .mode = table->mode, | |
1615 | .extra1 = SYSCTL_ZERO, | |
1616 | .extra2 = SYSCTL_ONE, | |
1617 | }; | |
1618 | ||
1619 | if (write && !capable(CAP_SYS_ADMIN)) | |
1620 | return -EPERM; | |
1621 | ||
1622 | mutex_lock(&static_key_mutex); | |
1623 | val = static_key_enabled(key); | |
1624 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1625 | if (write && !ret) { | |
1626 | if (val) | |
1627 | static_key_enable(key); | |
1628 | else | |
1629 | static_key_disable(key); | |
1630 | } | |
1631 | mutex_unlock(&static_key_mutex); | |
1632 | return ret; | |
1da177e4 LT |
1633 | } |
1634 | ||
f461d2dc | 1635 | static struct ctl_table kern_table[] = { |
f461d2dc CH |
1636 | { |
1637 | .procname = "panic", | |
1638 | .data = &panic_timeout, | |
1639 | .maxlen = sizeof(int), | |
1640 | .mode = 0644, | |
1641 | .proc_handler = proc_dointvec, | |
1642 | }, | |
f461d2dc CH |
1643 | #ifdef CONFIG_PROC_SYSCTL |
1644 | { | |
1645 | .procname = "tainted", | |
1646 | .maxlen = sizeof(long), | |
1647 | .mode = 0644, | |
1648 | .proc_handler = proc_taint, | |
1649 | }, | |
1650 | { | |
1651 | .procname = "sysctl_writes_strict", | |
1652 | .data = &sysctl_writes_strict, | |
1653 | .maxlen = sizeof(int), | |
1654 | .mode = 0644, | |
1655 | .proc_handler = proc_dointvec_minmax, | |
78e36f3b | 1656 | .extra1 = SYSCTL_NEG_ONE, |
f461d2dc CH |
1657 | .extra2 = SYSCTL_ONE, |
1658 | }, | |
f461d2dc CH |
1659 | #endif |
1660 | { | |
1661 | .procname = "print-fatal-signals", | |
1662 | .data = &print_fatal_signals, | |
1663 | .maxlen = sizeof(int), | |
1664 | .mode = 0644, | |
1665 | .proc_handler = proc_dointvec, | |
1666 | }, | |
1667 | #ifdef CONFIG_SPARC | |
1668 | { | |
1669 | .procname = "reboot-cmd", | |
1670 | .data = reboot_command, | |
1671 | .maxlen = 256, | |
1672 | .mode = 0644, | |
1673 | .proc_handler = proc_dostring, | |
1674 | }, | |
1675 | { | |
1676 | .procname = "stop-a", | |
1677 | .data = &stop_a_enabled, | |
1678 | .maxlen = sizeof (int), | |
1679 | .mode = 0644, | |
1680 | .proc_handler = proc_dointvec, | |
1681 | }, | |
1682 | { | |
1683 | .procname = "scons-poweroff", | |
1684 | .data = &scons_pwroff, | |
1685 | .maxlen = sizeof (int), | |
1686 | .mode = 0644, | |
1687 | .proc_handler = proc_dointvec, | |
1688 | }, | |
1689 | #endif | |
1690 | #ifdef CONFIG_SPARC64 | |
1691 | { | |
1692 | .procname = "tsb-ratio", | |
1693 | .data = &sysctl_tsb_ratio, | |
1694 | .maxlen = sizeof (int), | |
1695 | .mode = 0644, | |
1696 | .proc_handler = proc_dointvec, | |
1697 | }, | |
1698 | #endif | |
1699 | #ifdef CONFIG_PARISC | |
1700 | { | |
1701 | .procname = "soft-power", | |
1702 | .data = &pwrsw_enabled, | |
1703 | .maxlen = sizeof (int), | |
1704 | .mode = 0644, | |
1705 | .proc_handler = proc_dointvec, | |
1706 | }, | |
1707 | #endif | |
1708 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
1709 | { | |
1710 | .procname = "unaligned-trap", | |
1711 | .data = &unaligned_enabled, | |
1712 | .maxlen = sizeof (int), | |
1713 | .mode = 0644, | |
1714 | .proc_handler = proc_dointvec, | |
1715 | }, | |
f461d2dc CH |
1716 | #endif |
1717 | #ifdef CONFIG_STACK_TRACER | |
1718 | { | |
1719 | .procname = "stack_tracer_enabled", | |
1720 | .data = &stack_tracer_enabled, | |
1721 | .maxlen = sizeof(int), | |
1722 | .mode = 0644, | |
1723 | .proc_handler = stack_trace_sysctl, | |
1724 | }, | |
1725 | #endif | |
1726 | #ifdef CONFIG_TRACING | |
1727 | { | |
1728 | .procname = "ftrace_dump_on_oops", | |
1729 | .data = &ftrace_dump_on_oops, | |
1730 | .maxlen = sizeof(int), | |
1731 | .mode = 0644, | |
1732 | .proc_handler = proc_dointvec, | |
1733 | }, | |
1734 | { | |
1735 | .procname = "traceoff_on_warning", | |
1736 | .data = &__disable_trace_on_warning, | |
1737 | .maxlen = sizeof(__disable_trace_on_warning), | |
1738 | .mode = 0644, | |
1739 | .proc_handler = proc_dointvec, | |
1740 | }, | |
1741 | { | |
1742 | .procname = "tracepoint_printk", | |
1743 | .data = &tracepoint_printk, | |
1744 | .maxlen = sizeof(tracepoint_printk), | |
1745 | .mode = 0644, | |
1746 | .proc_handler = tracepoint_printk_sysctl, | |
1747 | }, | |
1748 | #endif | |
f461d2dc CH |
1749 | #ifdef CONFIG_MODULES |
1750 | { | |
1751 | .procname = "modprobe", | |
1752 | .data = &modprobe_path, | |
1753 | .maxlen = KMOD_PATH_LEN, | |
1754 | .mode = 0644, | |
1755 | .proc_handler = proc_dostring, | |
1756 | }, | |
1757 | { | |
1758 | .procname = "modules_disabled", | |
1759 | .data = &modules_disabled, | |
1760 | .maxlen = sizeof(int), | |
1761 | .mode = 0644, | |
1762 | /* only handle a transition from default "0" to "1" */ | |
1763 | .proc_handler = proc_dointvec_minmax, | |
1764 | .extra1 = SYSCTL_ONE, | |
1765 | .extra2 = SYSCTL_ONE, | |
1766 | }, | |
1767 | #endif | |
1768 | #ifdef CONFIG_UEVENT_HELPER | |
1769 | { | |
1770 | .procname = "hotplug", | |
1771 | .data = &uevent_helper, | |
1772 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1773 | .mode = 0644, | |
1774 | .proc_handler = proc_dostring, | |
1775 | }, | |
1776 | #endif | |
f461d2dc CH |
1777 | #ifdef CONFIG_MAGIC_SYSRQ |
1778 | { | |
1779 | .procname = "sysrq", | |
1780 | .data = NULL, | |
1781 | .maxlen = sizeof (int), | |
1782 | .mode = 0644, | |
1783 | .proc_handler = sysrq_sysctl_handler, | |
1784 | }, | |
1785 | #endif | |
1786 | #ifdef CONFIG_PROC_SYSCTL | |
1787 | { | |
1788 | .procname = "cad_pid", | |
1789 | .data = NULL, | |
1790 | .maxlen = sizeof (int), | |
1791 | .mode = 0600, | |
1792 | .proc_handler = proc_do_cad_pid, | |
1793 | }, | |
1794 | #endif | |
1795 | { | |
1796 | .procname = "threads-max", | |
1797 | .data = NULL, | |
1798 | .maxlen = sizeof(int), | |
1799 | .mode = 0644, | |
1800 | .proc_handler = sysctl_max_threads, | |
1801 | }, | |
f461d2dc CH |
1802 | { |
1803 | .procname = "usermodehelper", | |
1804 | .mode = 0555, | |
1805 | .child = usermodehelper_table, | |
1806 | }, | |
f461d2dc CH |
1807 | { |
1808 | .procname = "overflowuid", | |
1809 | .data = &overflowuid, | |
1810 | .maxlen = sizeof(int), | |
1811 | .mode = 0644, | |
1812 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 1813 | .extra1 = SYSCTL_ZERO, |
54771613 | 1814 | .extra2 = SYSCTL_MAXOLDUID, |
f461d2dc CH |
1815 | }, |
1816 | { | |
1817 | .procname = "overflowgid", | |
1818 | .data = &overflowgid, | |
1819 | .maxlen = sizeof(int), | |
1820 | .mode = 0644, | |
1821 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 1822 | .extra1 = SYSCTL_ZERO, |
54771613 | 1823 | .extra2 = SYSCTL_MAXOLDUID, |
f461d2dc CH |
1824 | }, |
1825 | #ifdef CONFIG_S390 | |
1826 | { | |
1827 | .procname = "userprocess_debug", | |
1828 | .data = &show_unhandled_signals, | |
1829 | .maxlen = sizeof(int), | |
1830 | .mode = 0644, | |
1831 | .proc_handler = proc_dointvec, | |
1832 | }, | |
1833 | #endif | |
1834 | { | |
1835 | .procname = "pid_max", | |
1836 | .data = &pid_max, | |
1837 | .maxlen = sizeof (int), | |
1838 | .mode = 0644, | |
1839 | .proc_handler = proc_dointvec_minmax, | |
1840 | .extra1 = &pid_max_min, | |
1841 | .extra2 = &pid_max_max, | |
1842 | }, | |
1843 | { | |
1844 | .procname = "panic_on_oops", | |
1845 | .data = &panic_on_oops, | |
1846 | .maxlen = sizeof(int), | |
1847 | .mode = 0644, | |
1848 | .proc_handler = proc_dointvec, | |
1849 | }, | |
1850 | { | |
1851 | .procname = "panic_print", | |
1852 | .data = &panic_print, | |
1853 | .maxlen = sizeof(unsigned long), | |
1854 | .mode = 0644, | |
1855 | .proc_handler = proc_doulongvec_minmax, | |
1856 | }, | |
f461d2dc CH |
1857 | { |
1858 | .procname = "ngroups_max", | |
f628867d | 1859 | .data = (void *)&ngroups_max, |
f461d2dc CH |
1860 | .maxlen = sizeof (int), |
1861 | .mode = 0444, | |
1862 | .proc_handler = proc_dointvec, | |
1863 | }, | |
1864 | { | |
1865 | .procname = "cap_last_cap", | |
1866 | .data = (void *)&cap_last_cap, | |
1867 | .maxlen = sizeof(int), | |
1868 | .mode = 0444, | |
1869 | .proc_handler = proc_dointvec, | |
1870 | }, | |
f461d2dc CH |
1871 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
1872 | { | |
1873 | .procname = "unknown_nmi_panic", | |
1874 | .data = &unknown_nmi_panic, | |
1875 | .maxlen = sizeof (int), | |
1876 | .mode = 0644, | |
1877 | .proc_handler = proc_dointvec, | |
1878 | }, | |
1879 | #endif | |
61d9b56a | 1880 | |
cb8e59cc LT |
1881 | #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \ |
1882 | defined(CONFIG_DEBUG_STACKOVERFLOW) | |
f461d2dc | 1883 | { |
cb8e59cc LT |
1884 | .procname = "panic_on_stackoverflow", |
1885 | .data = &sysctl_panic_on_stackoverflow, | |
f461d2dc CH |
1886 | .maxlen = sizeof(int), |
1887 | .mode = 0644, | |
1888 | .proc_handler = proc_dointvec, | |
1889 | }, | |
cb8e59cc LT |
1890 | #endif |
1891 | #if defined(CONFIG_X86) | |
f461d2dc | 1892 | { |
cb8e59cc LT |
1893 | .procname = "panic_on_unrecovered_nmi", |
1894 | .data = &panic_on_unrecovered_nmi, | |
f461d2dc CH |
1895 | .maxlen = sizeof(int), |
1896 | .mode = 0644, | |
1897 | .proc_handler = proc_dointvec, | |
1898 | }, | |
f461d2dc | 1899 | { |
cb8e59cc LT |
1900 | .procname = "panic_on_io_nmi", |
1901 | .data = &panic_on_io_nmi, | |
f461d2dc CH |
1902 | .maxlen = sizeof(int), |
1903 | .mode = 0644, | |
1904 | .proc_handler = proc_dointvec, | |
1905 | }, | |
f461d2dc CH |
1906 | { |
1907 | .procname = "bootloader_type", | |
1908 | .data = &bootloader_type, | |
1909 | .maxlen = sizeof (int), | |
1910 | .mode = 0444, | |
1911 | .proc_handler = proc_dointvec, | |
1912 | }, | |
1913 | { | |
1914 | .procname = "bootloader_version", | |
1915 | .data = &bootloader_version, | |
1916 | .maxlen = sizeof (int), | |
1917 | .mode = 0444, | |
1918 | .proc_handler = proc_dointvec, | |
1919 | }, | |
1920 | { | |
1921 | .procname = "io_delay_type", | |
1922 | .data = &io_delay_type, | |
1923 | .maxlen = sizeof(int), | |
1924 | .mode = 0644, | |
1925 | .proc_handler = proc_dointvec, | |
1926 | }, | |
1927 | #endif | |
1928 | #if defined(CONFIG_MMU) | |
1929 | { | |
1930 | .procname = "randomize_va_space", | |
1931 | .data = &randomize_va_space, | |
1932 | .maxlen = sizeof(int), | |
1933 | .mode = 0644, | |
1934 | .proc_handler = proc_dointvec, | |
1935 | }, | |
1936 | #endif | |
1937 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) | |
1938 | { | |
1939 | .procname = "spin_retry", | |
1940 | .data = &spin_retry, | |
1941 | .maxlen = sizeof (int), | |
1942 | .mode = 0644, | |
1943 | .proc_handler = proc_dointvec, | |
1944 | }, | |
1945 | #endif | |
1946 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) | |
1947 | { | |
1948 | .procname = "acpi_video_flags", | |
1949 | .data = &acpi_realmode_flags, | |
1950 | .maxlen = sizeof (unsigned long), | |
1951 | .mode = 0644, | |
1952 | .proc_handler = proc_doulongvec_minmax, | |
1953 | }, | |
1954 | #endif | |
1955 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
1956 | { | |
1957 | .procname = "ignore-unaligned-usertrap", | |
1958 | .data = &no_unaligned_warning, | |
1959 | .maxlen = sizeof (int), | |
1960 | .mode = 0644, | |
1961 | .proc_handler = proc_dointvec, | |
1962 | }, | |
1963 | #endif | |
1964 | #ifdef CONFIG_IA64 | |
1965 | { | |
1966 | .procname = "unaligned-dump-stack", | |
1967 | .data = &unaligned_dump_stack, | |
1968 | .maxlen = sizeof (int), | |
1969 | .mode = 0644, | |
1970 | .proc_handler = proc_dointvec, | |
1971 | }, | |
1972 | #endif | |
f461d2dc CH |
1973 | #ifdef CONFIG_RT_MUTEXES |
1974 | { | |
1975 | .procname = "max_lock_depth", | |
1976 | .data = &max_lock_depth, | |
1977 | .maxlen = sizeof(int), | |
1978 | .mode = 0644, | |
1979 | .proc_handler = proc_dointvec, | |
1980 | }, | |
1981 | #endif | |
f461d2dc CH |
1982 | #ifdef CONFIG_KEYS |
1983 | { | |
1984 | .procname = "keys", | |
1985 | .mode = 0555, | |
1986 | .child = key_sysctls, | |
1987 | }, | |
1988 | #endif | |
1989 | #ifdef CONFIG_PERF_EVENTS | |
1990 | /* | |
1991 | * User-space scripts rely on the existence of this file | |
1992 | * as a feature check for perf_events being enabled. | |
1993 | * | |
1994 | * So it's an ABI, do not remove! | |
1995 | */ | |
1996 | { | |
1997 | .procname = "perf_event_paranoid", | |
1998 | .data = &sysctl_perf_event_paranoid, | |
1999 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
2000 | .mode = 0644, | |
2001 | .proc_handler = proc_dointvec, | |
2002 | }, | |
2003 | { | |
2004 | .procname = "perf_event_mlock_kb", | |
2005 | .data = &sysctl_perf_event_mlock, | |
2006 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
2007 | .mode = 0644, | |
2008 | .proc_handler = proc_dointvec, | |
2009 | }, | |
2010 | { | |
2011 | .procname = "perf_event_max_sample_rate", | |
2012 | .data = &sysctl_perf_event_sample_rate, | |
2013 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
2014 | .mode = 0644, | |
2015 | .proc_handler = perf_proc_update_handler, | |
2016 | .extra1 = SYSCTL_ONE, | |
2017 | }, | |
2018 | { | |
2019 | .procname = "perf_cpu_time_max_percent", | |
2020 | .data = &sysctl_perf_cpu_time_max_percent, | |
2021 | .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), | |
2022 | .mode = 0644, | |
2023 | .proc_handler = perf_cpu_time_max_percent_handler, | |
2024 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2025 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2026 | }, |
2027 | { | |
2028 | .procname = "perf_event_max_stack", | |
2029 | .data = &sysctl_perf_event_max_stack, | |
2030 | .maxlen = sizeof(sysctl_perf_event_max_stack), | |
2031 | .mode = 0644, | |
2032 | .proc_handler = perf_event_max_stack_handler, | |
2033 | .extra1 = SYSCTL_ZERO, | |
d73840ec | 2034 | .extra2 = (void *)&six_hundred_forty_kb, |
f461d2dc CH |
2035 | }, |
2036 | { | |
2037 | .procname = "perf_event_max_contexts_per_stack", | |
2038 | .data = &sysctl_perf_event_max_contexts_per_stack, | |
2039 | .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), | |
2040 | .mode = 0644, | |
2041 | .proc_handler = perf_event_max_stack_handler, | |
2042 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2043 | .extra2 = SYSCTL_ONE_THOUSAND, |
f461d2dc CH |
2044 | }, |
2045 | #endif | |
2046 | { | |
2047 | .procname = "panic_on_warn", | |
2048 | .data = &panic_on_warn, | |
2049 | .maxlen = sizeof(int), | |
2050 | .mode = 0644, | |
2051 | .proc_handler = proc_dointvec_minmax, | |
2052 | .extra1 = SYSCTL_ZERO, | |
2053 | .extra2 = SYSCTL_ONE, | |
2054 | }, | |
7251ceb5 | 2055 | #ifdef CONFIG_TREE_RCU |
f461d2dc CH |
2056 | { |
2057 | .procname = "panic_on_rcu_stall", | |
2058 | .data = &sysctl_panic_on_rcu_stall, | |
2059 | .maxlen = sizeof(sysctl_panic_on_rcu_stall), | |
2060 | .mode = 0644, | |
2061 | .proc_handler = proc_dointvec_minmax, | |
2062 | .extra1 = SYSCTL_ZERO, | |
2063 | .extra2 = SYSCTL_ONE, | |
2064 | }, | |
dfe56404 | 2065 | { |
2066 | .procname = "max_rcu_stall_to_panic", | |
2067 | .data = &sysctl_max_rcu_stall_to_panic, | |
2068 | .maxlen = sizeof(sysctl_max_rcu_stall_to_panic), | |
2069 | .mode = 0644, | |
2070 | .proc_handler = proc_dointvec_minmax, | |
2071 | .extra1 = SYSCTL_ONE, | |
2072 | .extra2 = SYSCTL_INT_MAX, | |
2073 | }, | |
f461d2dc CH |
2074 | #endif |
2075 | { } | |
2076 | }; | |
1da177e4 | 2077 | |
f461d2dc CH |
2078 | static struct ctl_table vm_table[] = { |
2079 | { | |
2080 | .procname = "overcommit_memory", | |
2081 | .data = &sysctl_overcommit_memory, | |
2082 | .maxlen = sizeof(sysctl_overcommit_memory), | |
2083 | .mode = 0644, | |
56f3547b | 2084 | .proc_handler = overcommit_policy_handler, |
f461d2dc | 2085 | .extra1 = SYSCTL_ZERO, |
78e36f3b | 2086 | .extra2 = SYSCTL_TWO, |
f461d2dc | 2087 | }, |
f461d2dc CH |
2088 | { |
2089 | .procname = "overcommit_ratio", | |
2090 | .data = &sysctl_overcommit_ratio, | |
2091 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
2092 | .mode = 0644, | |
2093 | .proc_handler = overcommit_ratio_handler, | |
2094 | }, | |
2095 | { | |
2096 | .procname = "overcommit_kbytes", | |
2097 | .data = &sysctl_overcommit_kbytes, | |
2098 | .maxlen = sizeof(sysctl_overcommit_kbytes), | |
2099 | .mode = 0644, | |
2100 | .proc_handler = overcommit_kbytes_handler, | |
2101 | }, | |
2102 | { | |
2103 | .procname = "page-cluster", | |
2104 | .data = &page_cluster, | |
2105 | .maxlen = sizeof(int), | |
2106 | .mode = 0644, | |
2107 | .proc_handler = proc_dointvec_minmax, | |
2108 | .extra1 = SYSCTL_ZERO, | |
ea0ffd0c | 2109 | .extra2 = (void *)&page_cluster_max, |
f461d2dc | 2110 | }, |
f461d2dc CH |
2111 | { |
2112 | .procname = "dirtytime_expire_seconds", | |
2113 | .data = &dirtytime_expire_interval, | |
2114 | .maxlen = sizeof(dirtytime_expire_interval), | |
2115 | .mode = 0644, | |
2116 | .proc_handler = dirtytime_interval_handler, | |
2117 | .extra1 = SYSCTL_ZERO, | |
2118 | }, | |
2119 | { | |
2120 | .procname = "swappiness", | |
2121 | .data = &vm_swappiness, | |
2122 | .maxlen = sizeof(vm_swappiness), | |
2123 | .mode = 0644, | |
2124 | .proc_handler = proc_dointvec_minmax, | |
2125 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2126 | .extra2 = SYSCTL_TWO_HUNDRED, |
f461d2dc | 2127 | }, |
43b5240c MS |
2128 | #ifdef CONFIG_NUMA |
2129 | { | |
2130 | .procname = "numa_stat", | |
2131 | .data = &sysctl_vm_numa_stat, | |
2132 | .maxlen = sizeof(int), | |
2133 | .mode = 0644, | |
2134 | .proc_handler = sysctl_vm_numa_stat_handler, | |
2135 | .extra1 = SYSCTL_ZERO, | |
2136 | .extra2 = SYSCTL_ONE, | |
2137 | }, | |
2138 | #endif | |
f461d2dc CH |
2139 | #ifdef CONFIG_HUGETLB_PAGE |
2140 | { | |
2141 | .procname = "nr_hugepages", | |
2142 | .data = NULL, | |
2143 | .maxlen = sizeof(unsigned long), | |
2144 | .mode = 0644, | |
2145 | .proc_handler = hugetlb_sysctl_handler, | |
2146 | }, | |
2147 | #ifdef CONFIG_NUMA | |
2148 | { | |
2149 | .procname = "nr_hugepages_mempolicy", | |
2150 | .data = NULL, | |
2151 | .maxlen = sizeof(unsigned long), | |
2152 | .mode = 0644, | |
2153 | .proc_handler = &hugetlb_mempolicy_sysctl_handler, | |
2154 | }, | |
f461d2dc CH |
2155 | #endif |
2156 | { | |
2157 | .procname = "hugetlb_shm_group", | |
2158 | .data = &sysctl_hugetlb_shm_group, | |
2159 | .maxlen = sizeof(gid_t), | |
2160 | .mode = 0644, | |
2161 | .proc_handler = proc_dointvec, | |
2162 | }, | |
2163 | { | |
2164 | .procname = "nr_overcommit_hugepages", | |
2165 | .data = NULL, | |
2166 | .maxlen = sizeof(unsigned long), | |
2167 | .mode = 0644, | |
2168 | .proc_handler = hugetlb_overcommit_handler, | |
2169 | }, | |
2170 | #endif | |
2171 | { | |
2172 | .procname = "lowmem_reserve_ratio", | |
2173 | .data = &sysctl_lowmem_reserve_ratio, | |
2174 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
2175 | .mode = 0644, | |
2176 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, | |
2177 | }, | |
2178 | { | |
2179 | .procname = "drop_caches", | |
2180 | .data = &sysctl_drop_caches, | |
2181 | .maxlen = sizeof(int), | |
2182 | .mode = 0200, | |
2183 | .proc_handler = drop_caches_sysctl_handler, | |
2184 | .extra1 = SYSCTL_ONE, | |
78e36f3b | 2185 | .extra2 = SYSCTL_FOUR, |
f461d2dc CH |
2186 | }, |
2187 | #ifdef CONFIG_COMPACTION | |
2188 | { | |
2189 | .procname = "compact_memory", | |
ef498438 | 2190 | .data = NULL, |
f461d2dc CH |
2191 | .maxlen = sizeof(int), |
2192 | .mode = 0200, | |
2193 | .proc_handler = sysctl_compaction_handler, | |
2194 | }, | |
facdaa91 NG |
2195 | { |
2196 | .procname = "compaction_proactiveness", | |
2197 | .data = &sysctl_compaction_proactiveness, | |
d34c0a75 | 2198 | .maxlen = sizeof(sysctl_compaction_proactiveness), |
facdaa91 | 2199 | .mode = 0644, |
65d759c8 | 2200 | .proc_handler = compaction_proactiveness_sysctl_handler, |
facdaa91 | 2201 | .extra1 = SYSCTL_ZERO, |
78e36f3b | 2202 | .extra2 = SYSCTL_ONE_HUNDRED, |
facdaa91 | 2203 | }, |
f461d2dc CH |
2204 | { |
2205 | .procname = "extfrag_threshold", | |
2206 | .data = &sysctl_extfrag_threshold, | |
2207 | .maxlen = sizeof(int), | |
2208 | .mode = 0644, | |
2209 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 2210 | .extra1 = SYSCTL_ZERO, |
feb2bd01 | 2211 | .extra2 = SYSCTL_ONE_THOUSAND, |
f461d2dc CH |
2212 | }, |
2213 | { | |
2214 | .procname = "compact_unevictable_allowed", | |
2215 | .data = &sysctl_compact_unevictable_allowed, | |
2216 | .maxlen = sizeof(int), | |
2217 | .mode = 0644, | |
2218 | .proc_handler = proc_dointvec_minmax_warn_RT_change, | |
2219 | .extra1 = SYSCTL_ZERO, | |
2220 | .extra2 = SYSCTL_ONE, | |
2221 | }, | |
1da177e4 | 2222 | |
f461d2dc CH |
2223 | #endif /* CONFIG_COMPACTION */ |
2224 | { | |
2225 | .procname = "min_free_kbytes", | |
2226 | .data = &min_free_kbytes, | |
2227 | .maxlen = sizeof(min_free_kbytes), | |
2228 | .mode = 0644, | |
2229 | .proc_handler = min_free_kbytes_sysctl_handler, | |
2230 | .extra1 = SYSCTL_ZERO, | |
2231 | }, | |
2232 | { | |
2233 | .procname = "watermark_boost_factor", | |
2234 | .data = &watermark_boost_factor, | |
2235 | .maxlen = sizeof(watermark_boost_factor), | |
2236 | .mode = 0644, | |
2237 | .proc_handler = proc_dointvec_minmax, | |
2238 | .extra1 = SYSCTL_ZERO, | |
2239 | }, | |
2240 | { | |
2241 | .procname = "watermark_scale_factor", | |
2242 | .data = &watermark_scale_factor, | |
2243 | .maxlen = sizeof(watermark_scale_factor), | |
2244 | .mode = 0644, | |
2245 | .proc_handler = watermark_scale_factor_sysctl_handler, | |
2246 | .extra1 = SYSCTL_ONE, | |
78e36f3b | 2247 | .extra2 = SYSCTL_THREE_THOUSAND, |
f461d2dc CH |
2248 | }, |
2249 | { | |
74f44822 MG |
2250 | .procname = "percpu_pagelist_high_fraction", |
2251 | .data = &percpu_pagelist_high_fraction, | |
2252 | .maxlen = sizeof(percpu_pagelist_high_fraction), | |
f461d2dc | 2253 | .mode = 0644, |
74f44822 | 2254 | .proc_handler = percpu_pagelist_high_fraction_sysctl_handler, |
f461d2dc CH |
2255 | .extra1 = SYSCTL_ZERO, |
2256 | }, | |
5ef64cc8 LT |
2257 | { |
2258 | .procname = "page_lock_unfairness", | |
2259 | .data = &sysctl_page_lock_unfairness, | |
2260 | .maxlen = sizeof(sysctl_page_lock_unfairness), | |
2261 | .mode = 0644, | |
2262 | .proc_handler = proc_dointvec_minmax, | |
2263 | .extra1 = SYSCTL_ZERO, | |
2264 | }, | |
f461d2dc CH |
2265 | #ifdef CONFIG_MMU |
2266 | { | |
2267 | .procname = "max_map_count", | |
2268 | .data = &sysctl_max_map_count, | |
2269 | .maxlen = sizeof(sysctl_max_map_count), | |
2270 | .mode = 0644, | |
2271 | .proc_handler = proc_dointvec_minmax, | |
2272 | .extra1 = SYSCTL_ZERO, | |
2273 | }, | |
2274 | #else | |
2275 | { | |
2276 | .procname = "nr_trim_pages", | |
2277 | .data = &sysctl_nr_trim_pages, | |
2278 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
2279 | .mode = 0644, | |
2280 | .proc_handler = proc_dointvec_minmax, | |
2281 | .extra1 = SYSCTL_ZERO, | |
2282 | }, | |
2283 | #endif | |
f461d2dc CH |
2284 | { |
2285 | .procname = "vfs_cache_pressure", | |
2286 | .data = &sysctl_vfs_cache_pressure, | |
2287 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
2288 | .mode = 0644, | |
3b3376f2 | 2289 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2290 | .extra1 = SYSCTL_ZERO, |
2291 | }, | |
2292 | #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ | |
2293 | defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) | |
2294 | { | |
2295 | .procname = "legacy_va_layout", | |
2296 | .data = &sysctl_legacy_va_layout, | |
2297 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
2298 | .mode = 0644, | |
3b3376f2 | 2299 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2300 | .extra1 = SYSCTL_ZERO, |
2301 | }, | |
2302 | #endif | |
2303 | #ifdef CONFIG_NUMA | |
2304 | { | |
2305 | .procname = "zone_reclaim_mode", | |
2306 | .data = &node_reclaim_mode, | |
2307 | .maxlen = sizeof(node_reclaim_mode), | |
2308 | .mode = 0644, | |
3b3376f2 | 2309 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2310 | .extra1 = SYSCTL_ZERO, |
2311 | }, | |
2312 | { | |
2313 | .procname = "min_unmapped_ratio", | |
2314 | .data = &sysctl_min_unmapped_ratio, | |
2315 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
2316 | .mode = 0644, | |
2317 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, | |
2318 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2319 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2320 | }, |
2321 | { | |
2322 | .procname = "min_slab_ratio", | |
2323 | .data = &sysctl_min_slab_ratio, | |
2324 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
2325 | .mode = 0644, | |
2326 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, | |
2327 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2328 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2329 | }, |
2330 | #endif | |
2331 | #ifdef CONFIG_SMP | |
2332 | { | |
2333 | .procname = "stat_interval", | |
2334 | .data = &sysctl_stat_interval, | |
2335 | .maxlen = sizeof(sysctl_stat_interval), | |
2336 | .mode = 0644, | |
2337 | .proc_handler = proc_dointvec_jiffies, | |
2338 | }, | |
2339 | { | |
2340 | .procname = "stat_refresh", | |
2341 | .data = NULL, | |
2342 | .maxlen = 0, | |
2343 | .mode = 0600, | |
2344 | .proc_handler = vmstat_refresh, | |
2345 | }, | |
2346 | #endif | |
2347 | #ifdef CONFIG_MMU | |
2348 | { | |
2349 | .procname = "mmap_min_addr", | |
2350 | .data = &dac_mmap_min_addr, | |
2351 | .maxlen = sizeof(unsigned long), | |
2352 | .mode = 0644, | |
2353 | .proc_handler = mmap_min_addr_handler, | |
2354 | }, | |
2355 | #endif | |
2356 | #ifdef CONFIG_NUMA | |
2357 | { | |
2358 | .procname = "numa_zonelist_order", | |
2359 | .data = &numa_zonelist_order, | |
2360 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
2361 | .mode = 0644, | |
2362 | .proc_handler = numa_zonelist_order_handler, | |
2363 | }, | |
2364 | #endif | |
2365 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ | |
2366 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
2367 | { | |
2368 | .procname = "vdso_enabled", | |
2369 | #ifdef CONFIG_X86_32 | |
2370 | .data = &vdso32_enabled, | |
2371 | .maxlen = sizeof(vdso32_enabled), | |
2372 | #else | |
2373 | .data = &vdso_enabled, | |
2374 | .maxlen = sizeof(vdso_enabled), | |
2375 | #endif | |
2376 | .mode = 0644, | |
2377 | .proc_handler = proc_dointvec, | |
2378 | .extra1 = SYSCTL_ZERO, | |
2379 | }, | |
2380 | #endif | |
f461d2dc CH |
2381 | #ifdef CONFIG_MEMORY_FAILURE |
2382 | { | |
2383 | .procname = "memory_failure_early_kill", | |
2384 | .data = &sysctl_memory_failure_early_kill, | |
2385 | .maxlen = sizeof(sysctl_memory_failure_early_kill), | |
2386 | .mode = 0644, | |
2387 | .proc_handler = proc_dointvec_minmax, | |
2388 | .extra1 = SYSCTL_ZERO, | |
2389 | .extra2 = SYSCTL_ONE, | |
2390 | }, | |
2391 | { | |
2392 | .procname = "memory_failure_recovery", | |
2393 | .data = &sysctl_memory_failure_recovery, | |
2394 | .maxlen = sizeof(sysctl_memory_failure_recovery), | |
2395 | .mode = 0644, | |
2396 | .proc_handler = proc_dointvec_minmax, | |
2397 | .extra1 = SYSCTL_ZERO, | |
2398 | .extra2 = SYSCTL_ONE, | |
2399 | }, | |
2400 | #endif | |
2401 | { | |
2402 | .procname = "user_reserve_kbytes", | |
2403 | .data = &sysctl_user_reserve_kbytes, | |
2404 | .maxlen = sizeof(sysctl_user_reserve_kbytes), | |
2405 | .mode = 0644, | |
2406 | .proc_handler = proc_doulongvec_minmax, | |
2407 | }, | |
2408 | { | |
2409 | .procname = "admin_reserve_kbytes", | |
2410 | .data = &sysctl_admin_reserve_kbytes, | |
2411 | .maxlen = sizeof(sysctl_admin_reserve_kbytes), | |
2412 | .mode = 0644, | |
2413 | .proc_handler = proc_doulongvec_minmax, | |
2414 | }, | |
2415 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS | |
2416 | { | |
2417 | .procname = "mmap_rnd_bits", | |
2418 | .data = &mmap_rnd_bits, | |
2419 | .maxlen = sizeof(mmap_rnd_bits), | |
2420 | .mode = 0600, | |
2421 | .proc_handler = proc_dointvec_minmax, | |
2422 | .extra1 = (void *)&mmap_rnd_bits_min, | |
2423 | .extra2 = (void *)&mmap_rnd_bits_max, | |
2424 | }, | |
2425 | #endif | |
2426 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
2427 | { | |
2428 | .procname = "mmap_rnd_compat_bits", | |
2429 | .data = &mmap_rnd_compat_bits, | |
2430 | .maxlen = sizeof(mmap_rnd_compat_bits), | |
2431 | .mode = 0600, | |
2432 | .proc_handler = proc_dointvec_minmax, | |
2433 | .extra1 = (void *)&mmap_rnd_compat_bits_min, | |
2434 | .extra2 = (void *)&mmap_rnd_compat_bits_max, | |
2435 | }, | |
2436 | #endif | |
2437 | #ifdef CONFIG_USERFAULTFD | |
2438 | { | |
2439 | .procname = "unprivileged_userfaultfd", | |
2440 | .data = &sysctl_unprivileged_userfaultfd, | |
2441 | .maxlen = sizeof(sysctl_unprivileged_userfaultfd), | |
2442 | .mode = 0644, | |
2443 | .proc_handler = proc_dointvec_minmax, | |
2444 | .extra1 = SYSCTL_ZERO, | |
2445 | .extra2 = SYSCTL_ONE, | |
2446 | }, | |
2447 | #endif | |
2448 | { } | |
2449 | }; | |
1da177e4 | 2450 | |
f461d2dc CH |
2451 | static struct ctl_table debug_table[] = { |
2452 | #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE | |
2453 | { | |
2454 | .procname = "exception-trace", | |
2455 | .data = &show_unhandled_signals, | |
2456 | .maxlen = sizeof(int), | |
2457 | .mode = 0644, | |
2458 | .proc_handler = proc_dointvec | |
2459 | }, | |
f461d2dc CH |
2460 | #endif |
2461 | { } | |
2462 | }; | |
1da177e4 | 2463 | |
f461d2dc CH |
2464 | static struct ctl_table dev_table[] = { |
2465 | { } | |
2466 | }; | |
1da177e4 | 2467 | |
51cb8dfc LC |
2468 | DECLARE_SYSCTL_BASE(kernel, kern_table); |
2469 | DECLARE_SYSCTL_BASE(vm, vm_table); | |
51cb8dfc LC |
2470 | DECLARE_SYSCTL_BASE(debug, debug_table); |
2471 | DECLARE_SYSCTL_BASE(dev, dev_table); | |
1da177e4 | 2472 | |
d8c0418a | 2473 | int __init sysctl_init_bases(void) |
492ecee8 | 2474 | { |
51cb8dfc LC |
2475 | register_sysctl_base(kernel); |
2476 | register_sysctl_base(vm); | |
51cb8dfc LC |
2477 | register_sysctl_base(debug); |
2478 | register_sysctl_base(dev); | |
492ecee8 | 2479 | |
f461d2dc | 2480 | return 0; |
492ecee8 | 2481 | } |
f461d2dc | 2482 | #endif /* CONFIG_SYSCTL */ |
1da177e4 LT |
2483 | /* |
2484 | * No sense putting this after each symbol definition, twice, | |
2485 | * exception granted :-) | |
2486 | */ | |
a2071573 | 2487 | EXPORT_SYMBOL(proc_dobool); |
1da177e4 | 2488 | EXPORT_SYMBOL(proc_dointvec); |
e7d316a0 | 2489 | EXPORT_SYMBOL(proc_douintvec); |
1da177e4 LT |
2490 | EXPORT_SYMBOL(proc_dointvec_jiffies); |
2491 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
61d9b56a | 2492 | EXPORT_SYMBOL_GPL(proc_douintvec_minmax); |
1da177e4 LT |
2493 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
2494 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2495 | EXPORT_SYMBOL(proc_dostring); | |
2496 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2497 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
0bc19985 | 2498 | EXPORT_SYMBOL(proc_do_large_bitmap); |