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 | |
00b7c339 | 428 | static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
429 | int *valp, |
430 | int write, void *data) | |
431 | { | |
432 | if (write) { | |
230633d1 HS |
433 | if (*negp) { |
434 | if (*lvalp > (unsigned long) INT_MAX + 1) | |
435 | return -EINVAL; | |
1f1be04b | 436 | WRITE_ONCE(*valp, -*lvalp); |
230633d1 HS |
437 | } else { |
438 | if (*lvalp > (unsigned long) INT_MAX) | |
439 | return -EINVAL; | |
1f1be04b | 440 | WRITE_ONCE(*valp, *lvalp); |
230633d1 | 441 | } |
1da177e4 | 442 | } else { |
1f1be04b | 443 | int val = READ_ONCE(*valp); |
1da177e4 | 444 | if (val < 0) { |
00b7c339 | 445 | *negp = true; |
9a5bc726 | 446 | *lvalp = -(unsigned long)val; |
1da177e4 | 447 | } else { |
00b7c339 | 448 | *negp = false; |
1da177e4 LT |
449 | *lvalp = (unsigned long)val; |
450 | } | |
451 | } | |
452 | return 0; | |
453 | } | |
454 | ||
4f2fec00 LR |
455 | static int do_proc_douintvec_conv(unsigned long *lvalp, |
456 | unsigned int *valp, | |
457 | int write, void *data) | |
e7d316a0 SAK |
458 | { |
459 | if (write) { | |
425fffd8 LZ |
460 | if (*lvalp > UINT_MAX) |
461 | return -EINVAL; | |
4762b532 | 462 | WRITE_ONCE(*valp, *lvalp); |
e7d316a0 | 463 | } else { |
4762b532 | 464 | unsigned int val = READ_ONCE(*valp); |
e7d316a0 SAK |
465 | *lvalp = (unsigned long)val; |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
00b7c339 AW |
470 | static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; |
471 | ||
d8217f07 | 472 | static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, |
32927393 | 473 | int write, void *buffer, |
fcfbd547 | 474 | size_t *lenp, loff_t *ppos, |
00b7c339 | 475 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
1da177e4 LT |
476 | int write, void *data), |
477 | void *data) | |
478 | { | |
00b7c339 | 479 | int *i, vleft, first = 1, err = 0; |
00b7c339 | 480 | size_t left; |
32927393 | 481 | char *p; |
374a723c | 482 | |
00b7c339 | 483 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { |
1da177e4 LT |
484 | *lenp = 0; |
485 | return 0; | |
486 | } | |
374a723c | 487 | |
fcfbd547 | 488 | i = (int *) tbl_data; |
1da177e4 LT |
489 | vleft = table->maxlen / sizeof(*i); |
490 | left = *lenp; | |
491 | ||
492 | if (!conv) | |
493 | conv = do_proc_dointvec_conv; | |
494 | ||
00b7c339 | 495 | if (write) { |
d383d484 LR |
496 | if (proc_first_pos_non_zero_ignore(ppos, table)) |
497 | goto out; | |
f4aacea2 | 498 | |
00b7c339 AW |
499 | if (left > PAGE_SIZE - 1) |
500 | left = PAGE_SIZE - 1; | |
32927393 | 501 | p = buffer; |
00b7c339 AW |
502 | } |
503 | ||
1da177e4 | 504 | for (; left && vleft--; i++, first=0) { |
00b7c339 AW |
505 | unsigned long lval; |
506 | bool neg; | |
1da177e4 | 507 | |
00b7c339 | 508 | if (write) { |
bce93322 | 509 | proc_skip_spaces(&p, &left); |
1da177e4 | 510 | |
563b0467 O |
511 | if (!left) |
512 | break; | |
70f6cbb6 | 513 | err = proc_get_long(&p, &left, &lval, &neg, |
00b7c339 AW |
514 | proc_wspace_sep, |
515 | sizeof(proc_wspace_sep), NULL); | |
516 | if (err) | |
1da177e4 | 517 | break; |
00b7c339 AW |
518 | if (conv(&neg, &lval, i, 1, data)) { |
519 | err = -EINVAL; | |
1da177e4 | 520 | break; |
00b7c339 | 521 | } |
1da177e4 | 522 | } else { |
00b7c339 AW |
523 | if (conv(&neg, &lval, i, 0, data)) { |
524 | err = -EINVAL; | |
525 | break; | |
526 | } | |
1da177e4 | 527 | if (!first) |
32927393 CH |
528 | proc_put_char(&buffer, &left, '\t'); |
529 | proc_put_long(&buffer, &left, lval, neg); | |
1da177e4 LT |
530 | } |
531 | } | |
532 | ||
00b7c339 | 533 | if (!write && !first && left && !err) |
32927393 | 534 | proc_put_char(&buffer, &left, '\n'); |
563b0467 | 535 | if (write && !err && left) |
bce93322 | 536 | proc_skip_spaces(&p, &left); |
32927393 CH |
537 | if (write && first) |
538 | return err ? : -EINVAL; | |
1da177e4 | 539 | *lenp -= left; |
f4aacea2 | 540 | out: |
1da177e4 | 541 | *ppos += *lenp; |
00b7c339 | 542 | return err; |
1da177e4 LT |
543 | } |
544 | ||
8d65af78 | 545 | static int do_proc_dointvec(struct ctl_table *table, int write, |
32927393 | 546 | void *buffer, size_t *lenp, loff_t *ppos, |
00b7c339 | 547 | int (*conv)(bool *negp, unsigned long *lvalp, int *valp, |
fcfbd547 KK |
548 | int write, void *data), |
549 | void *data) | |
550 | { | |
8d65af78 | 551 | return __do_proc_dointvec(table->data, table, write, |
fcfbd547 KK |
552 | buffer, lenp, ppos, conv, data); |
553 | } | |
554 | ||
4f2fec00 LR |
555 | static int do_proc_douintvec_w(unsigned int *tbl_data, |
556 | struct ctl_table *table, | |
32927393 | 557 | void *buffer, |
4f2fec00 LR |
558 | size_t *lenp, loff_t *ppos, |
559 | int (*conv)(unsigned long *lvalp, | |
560 | unsigned int *valp, | |
561 | int write, void *data), | |
562 | void *data) | |
563 | { | |
564 | unsigned long lval; | |
565 | int err = 0; | |
566 | size_t left; | |
567 | bool neg; | |
32927393 | 568 | char *p = buffer; |
4f2fec00 LR |
569 | |
570 | left = *lenp; | |
571 | ||
572 | if (proc_first_pos_non_zero_ignore(ppos, table)) | |
573 | goto bail_early; | |
574 | ||
575 | if (left > PAGE_SIZE - 1) | |
576 | left = PAGE_SIZE - 1; | |
577 | ||
bce93322 | 578 | proc_skip_spaces(&p, &left); |
4f2fec00 LR |
579 | if (!left) { |
580 | err = -EINVAL; | |
581 | goto out_free; | |
582 | } | |
583 | ||
584 | err = proc_get_long(&p, &left, &lval, &neg, | |
585 | proc_wspace_sep, | |
586 | sizeof(proc_wspace_sep), NULL); | |
587 | if (err || neg) { | |
588 | err = -EINVAL; | |
589 | goto out_free; | |
590 | } | |
591 | ||
592 | if (conv(&lval, tbl_data, 1, data)) { | |
593 | err = -EINVAL; | |
594 | goto out_free; | |
595 | } | |
596 | ||
597 | if (!err && left) | |
bce93322 | 598 | proc_skip_spaces(&p, &left); |
4f2fec00 LR |
599 | |
600 | out_free: | |
4f2fec00 LR |
601 | if (err) |
602 | return -EINVAL; | |
603 | ||
604 | return 0; | |
605 | ||
606 | /* This is in keeping with old __do_proc_dointvec() */ | |
607 | bail_early: | |
608 | *ppos += *lenp; | |
609 | return err; | |
610 | } | |
611 | ||
32927393 | 612 | static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer, |
4f2fec00 LR |
613 | size_t *lenp, loff_t *ppos, |
614 | int (*conv)(unsigned long *lvalp, | |
615 | unsigned int *valp, | |
616 | int write, void *data), | |
617 | void *data) | |
618 | { | |
619 | unsigned long lval; | |
620 | int err = 0; | |
621 | size_t left; | |
622 | ||
623 | left = *lenp; | |
624 | ||
625 | if (conv(&lval, tbl_data, 0, data)) { | |
626 | err = -EINVAL; | |
627 | goto out; | |
628 | } | |
629 | ||
32927393 CH |
630 | proc_put_long(&buffer, &left, lval, false); |
631 | if (!left) | |
4f2fec00 LR |
632 | goto out; |
633 | ||
32927393 | 634 | proc_put_char(&buffer, &left, '\n'); |
4f2fec00 LR |
635 | |
636 | out: | |
637 | *lenp -= left; | |
638 | *ppos += *lenp; | |
639 | ||
640 | return err; | |
641 | } | |
642 | ||
643 | static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, | |
32927393 | 644 | int write, void *buffer, |
4f2fec00 LR |
645 | size_t *lenp, loff_t *ppos, |
646 | int (*conv)(unsigned long *lvalp, | |
647 | unsigned int *valp, | |
648 | int write, void *data), | |
649 | void *data) | |
650 | { | |
651 | unsigned int *i, vleft; | |
652 | ||
653 | if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
654 | *lenp = 0; | |
655 | return 0; | |
656 | } | |
657 | ||
658 | i = (unsigned int *) tbl_data; | |
659 | vleft = table->maxlen / sizeof(*i); | |
660 | ||
661 | /* | |
662 | * Arrays are not supported, keep this simple. *Do not* add | |
663 | * support for them. | |
664 | */ | |
665 | if (vleft != 1) { | |
666 | *lenp = 0; | |
667 | return -EINVAL; | |
668 | } | |
669 | ||
670 | if (!conv) | |
671 | conv = do_proc_douintvec_conv; | |
672 | ||
673 | if (write) | |
674 | return do_proc_douintvec_w(i, table, buffer, lenp, ppos, | |
675 | conv, data); | |
676 | return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); | |
677 | } | |
678 | ||
1998f193 LC |
679 | int do_proc_douintvec(struct ctl_table *table, int write, |
680 | void *buffer, size_t *lenp, loff_t *ppos, | |
681 | int (*conv)(unsigned long *lvalp, | |
682 | unsigned int *valp, | |
683 | int write, void *data), | |
684 | void *data) | |
4f2fec00 LR |
685 | { |
686 | return __do_proc_douintvec(table->data, table, write, | |
687 | buffer, lenp, ppos, conv, data); | |
688 | } | |
689 | ||
a2071573 JH |
690 | /** |
691 | * proc_dobool - read/write a bool | |
692 | * @table: the sysctl table | |
693 | * @write: %TRUE if this is a write to the sysctl file | |
694 | * @buffer: the user buffer | |
695 | * @lenp: the size of the user buffer | |
696 | * @ppos: file position | |
697 | * | |
f1aa2eb5 OM |
698 | * Reads/writes one integer value from/to the user buffer, |
699 | * treated as an ASCII string. | |
700 | * | |
701 | * table->data must point to a bool variable and table->maxlen must | |
702 | * be sizeof(bool). | |
a2071573 JH |
703 | * |
704 | * Returns 0 on success. | |
705 | */ | |
706 | int proc_dobool(struct ctl_table *table, int write, void *buffer, | |
707 | size_t *lenp, loff_t *ppos) | |
708 | { | |
f1aa2eb5 OM |
709 | struct ctl_table tmp; |
710 | bool *data = table->data; | |
711 | int res, val; | |
712 | ||
713 | /* Do not support arrays yet. */ | |
714 | if (table->maxlen != sizeof(bool)) | |
715 | return -EINVAL; | |
716 | ||
717 | tmp = *table; | |
718 | tmp.maxlen = sizeof(val); | |
719 | tmp.data = &val; | |
720 | ||
721 | val = READ_ONCE(*data); | |
722 | res = proc_dointvec(&tmp, write, buffer, lenp, ppos); | |
723 | if (res) | |
724 | return res; | |
725 | if (write) | |
726 | WRITE_ONCE(*data, val); | |
727 | return 0; | |
a2071573 JH |
728 | } |
729 | ||
1da177e4 LT |
730 | /** |
731 | * proc_dointvec - read a vector of integers | |
732 | * @table: the sysctl table | |
733 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
734 | * @buffer: the user buffer |
735 | * @lenp: the size of the user buffer | |
736 | * @ppos: file position | |
737 | * | |
738 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
374a723c | 739 | * values from/to the user buffer, treated as an ASCII string. |
1da177e4 LT |
740 | * |
741 | * Returns 0 on success. | |
742 | */ | |
32927393 CH |
743 | int proc_dointvec(struct ctl_table *table, int write, void *buffer, |
744 | size_t *lenp, loff_t *ppos) | |
1da177e4 | 745 | { |
e7d316a0 SAK |
746 | return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); |
747 | } | |
748 | ||
6923aa0d SAS |
749 | #ifdef CONFIG_COMPACTION |
750 | static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table, | |
32927393 | 751 | int write, void *buffer, size_t *lenp, loff_t *ppos) |
6923aa0d SAS |
752 | { |
753 | int ret, old; | |
754 | ||
755 | if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write) | |
756 | return proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
757 | ||
758 | old = *(int *)table->data; | |
759 | ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); | |
760 | if (ret) | |
761 | return ret; | |
762 | if (old != *(int *)table->data) | |
763 | pr_warn_once("sysctl attribute %s changed by %s[%d]\n", | |
764 | table->procname, current->comm, | |
765 | task_pid_nr(current)); | |
766 | return ret; | |
767 | } | |
768 | #endif | |
769 | ||
e7d316a0 SAK |
770 | /** |
771 | * proc_douintvec - read a vector of unsigned integers | |
772 | * @table: the sysctl table | |
773 | * @write: %TRUE if this is a write to the sysctl file | |
774 | * @buffer: the user buffer | |
775 | * @lenp: the size of the user buffer | |
776 | * @ppos: file position | |
777 | * | |
778 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
779 | * values from/to the user buffer, treated as an ASCII string. | |
780 | * | |
781 | * Returns 0 on success. | |
782 | */ | |
32927393 CH |
783 | int proc_douintvec(struct ctl_table *table, int write, void *buffer, |
784 | size_t *lenp, loff_t *ppos) | |
e7d316a0 | 785 | { |
4f2fec00 LR |
786 | return do_proc_douintvec(table, write, buffer, lenp, ppos, |
787 | do_proc_douintvec_conv, NULL); | |
1da177e4 LT |
788 | } |
789 | ||
34f5a398 | 790 | /* |
25ddbb18 AK |
791 | * Taint values can only be increased |
792 | * This means we can safely use a temporary. | |
34f5a398 | 793 | */ |
8d65af78 | 794 | static int proc_taint(struct ctl_table *table, int write, |
32927393 | 795 | void *buffer, size_t *lenp, loff_t *ppos) |
34f5a398 | 796 | { |
25ddbb18 AK |
797 | struct ctl_table t; |
798 | unsigned long tmptaint = get_taint(); | |
799 | int err; | |
34f5a398 | 800 | |
91fcd412 | 801 | if (write && !capable(CAP_SYS_ADMIN)) |
34f5a398 TT |
802 | return -EPERM; |
803 | ||
25ddbb18 AK |
804 | t = *table; |
805 | t.data = &tmptaint; | |
8d65af78 | 806 | err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); |
25ddbb18 AK |
807 | if (err < 0) |
808 | return err; | |
809 | ||
810 | if (write) { | |
db38d5c1 RA |
811 | int i; |
812 | ||
813 | /* | |
814 | * If we are relying on panic_on_taint not producing | |
815 | * false positives due to userspace input, bail out | |
816 | * before setting the requested taint flags. | |
817 | */ | |
818 | if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint)) | |
819 | return -EINVAL; | |
820 | ||
25ddbb18 AK |
821 | /* |
822 | * Poor man's atomic or. Not worth adding a primitive | |
823 | * to everyone's atomic.h for this | |
824 | */ | |
e77132e7 RA |
825 | for (i = 0; i < TAINT_FLAGS_COUNT; i++) |
826 | if ((1UL << i) & tmptaint) | |
373d4d09 | 827 | add_taint(i, LOCKDEP_STILL_OK); |
25ddbb18 AK |
828 | } |
829 | ||
830 | return err; | |
34f5a398 TT |
831 | } |
832 | ||
24704f36 WL |
833 | /** |
834 | * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure | |
835 | * @min: pointer to minimum allowable value | |
836 | * @max: pointer to maximum allowable value | |
837 | * | |
838 | * The do_proc_dointvec_minmax_conv_param structure provides the | |
839 | * minimum and maximum values for doing range checking for those sysctl | |
840 | * parameters that use the proc_dointvec_minmax() handler. | |
841 | */ | |
1da177e4 LT |
842 | struct do_proc_dointvec_minmax_conv_param { |
843 | int *min; | |
844 | int *max; | |
845 | }; | |
846 | ||
00b7c339 AW |
847 | static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, |
848 | int *valp, | |
1da177e4 LT |
849 | int write, void *data) |
850 | { | |
2bc4fc60 | 851 | int tmp, ret; |
1da177e4 | 852 | struct do_proc_dointvec_minmax_conv_param *param = data; |
2bc4fc60 ZW |
853 | /* |
854 | * If writing, first do so via a temporary local int so we can | |
855 | * bounds-check it before touching *valp. | |
856 | */ | |
857 | int *ip = write ? &tmp : valp; | |
858 | ||
859 | ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data); | |
860 | if (ret) | |
861 | return ret; | |
862 | ||
1da177e4 | 863 | if (write) { |
2bc4fc60 ZW |
864 | if ((param->min && *param->min > tmp) || |
865 | (param->max && *param->max < tmp)) | |
1da177e4 | 866 | return -EINVAL; |
f613d86d | 867 | WRITE_ONCE(*valp, tmp); |
1da177e4 | 868 | } |
2bc4fc60 | 869 | |
1da177e4 LT |
870 | return 0; |
871 | } | |
872 | ||
873 | /** | |
874 | * proc_dointvec_minmax - read a vector of integers with min/max values | |
875 | * @table: the sysctl table | |
876 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
877 | * @buffer: the user buffer |
878 | * @lenp: the size of the user buffer | |
879 | * @ppos: file position | |
880 | * | |
881 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
882 | * values from/to the user buffer, treated as an ASCII string. | |
883 | * | |
884 | * This routine will ensure the values are within the range specified by | |
885 | * table->extra1 (min) and table->extra2 (max). | |
886 | * | |
24704f36 | 887 | * Returns 0 on success or -EINVAL on write when the range check fails. |
1da177e4 | 888 | */ |
8d65af78 | 889 | int proc_dointvec_minmax(struct ctl_table *table, int write, |
32927393 | 890 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
891 | { |
892 | struct do_proc_dointvec_minmax_conv_param param = { | |
893 | .min = (int *) table->extra1, | |
894 | .max = (int *) table->extra2, | |
895 | }; | |
8d65af78 | 896 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
897 | do_proc_dointvec_minmax_conv, ¶m); |
898 | } | |
899 | ||
24704f36 WL |
900 | /** |
901 | * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure | |
902 | * @min: pointer to minimum allowable value | |
903 | * @max: pointer to maximum allowable value | |
904 | * | |
905 | * The do_proc_douintvec_minmax_conv_param structure provides the | |
906 | * minimum and maximum values for doing range checking for those sysctl | |
907 | * parameters that use the proc_douintvec_minmax() handler. | |
908 | */ | |
61d9b56a LR |
909 | struct do_proc_douintvec_minmax_conv_param { |
910 | unsigned int *min; | |
911 | unsigned int *max; | |
912 | }; | |
913 | ||
914 | static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, | |
915 | unsigned int *valp, | |
916 | int write, void *data) | |
917 | { | |
2bc4fc60 ZW |
918 | int ret; |
919 | unsigned int tmp; | |
61d9b56a | 920 | struct do_proc_douintvec_minmax_conv_param *param = data; |
2bc4fc60 ZW |
921 | /* write via temporary local uint for bounds-checking */ |
922 | unsigned int *up = write ? &tmp : valp; | |
61d9b56a | 923 | |
2bc4fc60 ZW |
924 | ret = do_proc_douintvec_conv(lvalp, up, write, data); |
925 | if (ret) | |
926 | return ret; | |
fb910c42 | 927 | |
2bc4fc60 ZW |
928 | if (write) { |
929 | if ((param->min && *param->min > tmp) || | |
930 | (param->max && *param->max < tmp)) | |
61d9b56a LR |
931 | return -ERANGE; |
932 | ||
2d3b559d | 933 | WRITE_ONCE(*valp, tmp); |
61d9b56a LR |
934 | } |
935 | ||
936 | return 0; | |
937 | } | |
938 | ||
939 | /** | |
940 | * proc_douintvec_minmax - read a vector of unsigned ints with min/max values | |
941 | * @table: the sysctl table | |
942 | * @write: %TRUE if this is a write to the sysctl file | |
943 | * @buffer: the user buffer | |
944 | * @lenp: the size of the user buffer | |
945 | * @ppos: file position | |
946 | * | |
947 | * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer | |
948 | * values from/to the user buffer, treated as an ASCII string. Negative | |
949 | * strings are not allowed. | |
950 | * | |
951 | * This routine will ensure the values are within the range specified by | |
952 | * table->extra1 (min) and table->extra2 (max). There is a final sanity | |
953 | * check for UINT_MAX to avoid having to support wrap around uses from | |
954 | * userspace. | |
955 | * | |
24704f36 | 956 | * Returns 0 on success or -ERANGE on write when the range check fails. |
61d9b56a LR |
957 | */ |
958 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
32927393 | 959 | void *buffer, size_t *lenp, loff_t *ppos) |
61d9b56a LR |
960 | { |
961 | struct do_proc_douintvec_minmax_conv_param param = { | |
962 | .min = (unsigned int *) table->extra1, | |
963 | .max = (unsigned int *) table->extra2, | |
964 | }; | |
965 | return do_proc_douintvec(table, write, buffer, lenp, ppos, | |
966 | do_proc_douintvec_minmax_conv, ¶m); | |
967 | } | |
968 | ||
cb944413 ED |
969 | /** |
970 | * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values | |
971 | * @table: the sysctl table | |
972 | * @write: %TRUE if this is a write to the sysctl file | |
973 | * @buffer: the user buffer | |
974 | * @lenp: the size of the user buffer | |
975 | * @ppos: file position | |
976 | * | |
977 | * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars | |
978 | * values from/to the user buffer, treated as an ASCII string. Negative | |
979 | * strings are not allowed. | |
980 | * | |
981 | * This routine will ensure the values are within the range specified by | |
982 | * table->extra1 (min) and table->extra2 (max). | |
983 | * | |
984 | * Returns 0 on success or an error on write when the range check fails. | |
985 | */ | |
986 | int proc_dou8vec_minmax(struct ctl_table *table, int write, | |
987 | void *buffer, size_t *lenp, loff_t *ppos) | |
988 | { | |
989 | struct ctl_table tmp; | |
990 | unsigned int min = 0, max = 255U, val; | |
991 | u8 *data = table->data; | |
992 | struct do_proc_douintvec_minmax_conv_param param = { | |
993 | .min = &min, | |
994 | .max = &max, | |
995 | }; | |
996 | int res; | |
997 | ||
998 | /* Do not support arrays yet. */ | |
999 | if (table->maxlen != sizeof(u8)) | |
1000 | return -EINVAL; | |
1001 | ||
1002 | if (table->extra1) { | |
1003 | min = *(unsigned int *) table->extra1; | |
1004 | if (min > 255U) | |
1005 | return -EINVAL; | |
1006 | } | |
1007 | if (table->extra2) { | |
1008 | max = *(unsigned int *) table->extra2; | |
1009 | if (max > 255U) | |
1010 | return -EINVAL; | |
1011 | } | |
1012 | ||
1013 | tmp = *table; | |
1014 | ||
1015 | tmp.maxlen = sizeof(val); | |
1016 | tmp.data = &val; | |
7dee5d77 | 1017 | val = READ_ONCE(*data); |
cb944413 ED |
1018 | res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos, |
1019 | do_proc_douintvec_minmax_conv, ¶m); | |
1020 | if (res) | |
1021 | return res; | |
1022 | if (write) | |
7dee5d77 | 1023 | WRITE_ONCE(*data, val); |
cb944413 ED |
1024 | return 0; |
1025 | } | |
1026 | EXPORT_SYMBOL_GPL(proc_dou8vec_minmax); | |
1027 | ||
eaee4172 DS |
1028 | #ifdef CONFIG_MAGIC_SYSRQ |
1029 | static int sysrq_sysctl_handler(struct ctl_table *table, int write, | |
32927393 | 1030 | void *buffer, size_t *lenp, loff_t *ppos) |
eaee4172 DS |
1031 | { |
1032 | int tmp, ret; | |
1033 | ||
1034 | tmp = sysrq_mask(); | |
1035 | ||
1036 | ret = __do_proc_dointvec(&tmp, table, write, buffer, | |
1037 | lenp, ppos, NULL, NULL); | |
1038 | if (ret || !write) | |
1039 | return ret; | |
1040 | ||
1041 | if (write) | |
1042 | sysrq_toggle_support(tmp); | |
1043 | ||
1044 | return 0; | |
1045 | } | |
1046 | #endif | |
1047 | ||
32927393 CH |
1048 | static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, |
1049 | int write, void *buffer, size_t *lenp, loff_t *ppos, | |
1050 | unsigned long convmul, unsigned long convdiv) | |
1da177e4 | 1051 | { |
00b7c339 AW |
1052 | unsigned long *i, *min, *max; |
1053 | int vleft, first = 1, err = 0; | |
00b7c339 | 1054 | size_t left; |
32927393 | 1055 | char *p; |
00b7c339 AW |
1056 | |
1057 | if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { | |
1da177e4 LT |
1058 | *lenp = 0; |
1059 | return 0; | |
1060 | } | |
00b7c339 | 1061 | |
8ebc4123 DC |
1062 | i = data; |
1063 | min = table->extra1; | |
1064 | max = table->extra2; | |
1da177e4 LT |
1065 | vleft = table->maxlen / sizeof(unsigned long); |
1066 | left = *lenp; | |
00b7c339 AW |
1067 | |
1068 | if (write) { | |
d383d484 LR |
1069 | if (proc_first_pos_non_zero_ignore(ppos, table)) |
1070 | goto out; | |
f4aacea2 | 1071 | |
00b7c339 AW |
1072 | if (left > PAGE_SIZE - 1) |
1073 | left = PAGE_SIZE - 1; | |
32927393 | 1074 | p = buffer; |
00b7c339 AW |
1075 | } |
1076 | ||
27b3d80a | 1077 | for (; left && vleft--; i++, first = 0) { |
00b7c339 AW |
1078 | unsigned long val; |
1079 | ||
1da177e4 | 1080 | if (write) { |
00b7c339 AW |
1081 | bool neg; |
1082 | ||
bce93322 | 1083 | proc_skip_spaces(&p, &left); |
09be1784 CL |
1084 | if (!left) |
1085 | break; | |
00b7c339 | 1086 | |
70f6cbb6 | 1087 | err = proc_get_long(&p, &left, &val, &neg, |
00b7c339 AW |
1088 | proc_wspace_sep, |
1089 | sizeof(proc_wspace_sep), NULL); | |
1622ed7d BL |
1090 | if (err || neg) { |
1091 | err = -EINVAL; | |
1da177e4 | 1092 | break; |
1622ed7d BL |
1093 | } |
1094 | ||
ff9f8a7c | 1095 | val = convmul * val / convdiv; |
e260ad01 CB |
1096 | if ((min && val < *min) || (max && val > *max)) { |
1097 | err = -EINVAL; | |
1098 | break; | |
1099 | } | |
c31bcc8f | 1100 | WRITE_ONCE(*i, val); |
1da177e4 | 1101 | } else { |
c31bcc8f | 1102 | val = convdiv * READ_ONCE(*i) / convmul; |
32927393 CH |
1103 | if (!first) |
1104 | proc_put_char(&buffer, &left, '\t'); | |
1105 | proc_put_long(&buffer, &left, val, false); | |
1da177e4 LT |
1106 | } |
1107 | } | |
1108 | ||
00b7c339 | 1109 | if (!write && !first && left && !err) |
32927393 | 1110 | proc_put_char(&buffer, &left, '\n'); |
00b7c339 | 1111 | if (write && !err) |
bce93322 | 1112 | proc_skip_spaces(&p, &left); |
32927393 CH |
1113 | if (write && first) |
1114 | return err ? : -EINVAL; | |
1da177e4 | 1115 | *lenp -= left; |
f4aacea2 | 1116 | out: |
1da177e4 | 1117 | *ppos += *lenp; |
00b7c339 | 1118 | return err; |
1da177e4 LT |
1119 | } |
1120 | ||
d8217f07 | 1121 | static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 CH |
1122 | void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul, |
1123 | unsigned long convdiv) | |
fcfbd547 KK |
1124 | { |
1125 | return __do_proc_doulongvec_minmax(table->data, table, write, | |
8d65af78 | 1126 | buffer, lenp, ppos, convmul, convdiv); |
fcfbd547 KK |
1127 | } |
1128 | ||
1da177e4 LT |
1129 | /** |
1130 | * proc_doulongvec_minmax - read a vector of long integers with min/max values | |
1131 | * @table: the sysctl table | |
1132 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1133 | * @buffer: the user buffer |
1134 | * @lenp: the size of the user buffer | |
1135 | * @ppos: file position | |
1136 | * | |
1137 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1138 | * values from/to the user buffer, treated as an ASCII string. | |
1139 | * | |
1140 | * This routine will ensure the values are within the range specified by | |
1141 | * table->extra1 (min) and table->extra2 (max). | |
1142 | * | |
1143 | * Returns 0 on success. | |
1144 | */ | |
8d65af78 | 1145 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 | 1146 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1147 | { |
8d65af78 | 1148 | return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | /** | |
1152 | * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values | |
1153 | * @table: the sysctl table | |
1154 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1155 | * @buffer: the user buffer |
1156 | * @lenp: the size of the user buffer | |
1157 | * @ppos: file position | |
1158 | * | |
1159 | * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long | |
1160 | * values from/to the user buffer, treated as an ASCII string. The values | |
1161 | * are treated as milliseconds, and converted to jiffies when they are stored. | |
1162 | * | |
1163 | * This routine will ensure the values are within the range specified by | |
1164 | * table->extra1 (min) and table->extra2 (max). | |
1165 | * | |
1166 | * Returns 0 on success. | |
1167 | */ | |
d8217f07 | 1168 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
32927393 | 1169 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1170 | { |
8d65af78 | 1171 | return do_proc_doulongvec_minmax(table, write, buffer, |
1da177e4 LT |
1172 | lenp, ppos, HZ, 1000l); |
1173 | } | |
1174 | ||
1175 | ||
00b7c339 | 1176 | static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1177 | int *valp, |
1178 | int write, void *data) | |
1179 | { | |
1180 | if (write) { | |
63259457 | 1181 | if (*lvalp > INT_MAX / HZ) |
cba9f33d | 1182 | return 1; |
e8778208 KI |
1183 | if (*negp) |
1184 | WRITE_ONCE(*valp, -*lvalp * HZ); | |
1185 | else | |
1186 | WRITE_ONCE(*valp, *lvalp * HZ); | |
1da177e4 | 1187 | } else { |
e8778208 | 1188 | int val = READ_ONCE(*valp); |
1da177e4 LT |
1189 | unsigned long lval; |
1190 | if (val < 0) { | |
00b7c339 | 1191 | *negp = true; |
9a5bc726 | 1192 | lval = -(unsigned long)val; |
1da177e4 | 1193 | } else { |
00b7c339 | 1194 | *negp = false; |
1da177e4 LT |
1195 | lval = (unsigned long)val; |
1196 | } | |
1197 | *lvalp = lval / HZ; | |
1198 | } | |
1199 | return 0; | |
1200 | } | |
1201 | ||
00b7c339 | 1202 | static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1203 | int *valp, |
1204 | int write, void *data) | |
1205 | { | |
1206 | if (write) { | |
cba9f33d BS |
1207 | if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) |
1208 | return 1; | |
1da177e4 LT |
1209 | *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); |
1210 | } else { | |
1211 | int val = *valp; | |
1212 | unsigned long lval; | |
1213 | if (val < 0) { | |
00b7c339 | 1214 | *negp = true; |
9a5bc726 | 1215 | lval = -(unsigned long)val; |
1da177e4 | 1216 | } else { |
00b7c339 | 1217 | *negp = false; |
1da177e4 LT |
1218 | lval = (unsigned long)val; |
1219 | } | |
1220 | *lvalp = jiffies_to_clock_t(lval); | |
1221 | } | |
1222 | return 0; | |
1223 | } | |
1224 | ||
00b7c339 | 1225 | static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, |
1da177e4 LT |
1226 | int *valp, |
1227 | int write, void *data) | |
1228 | { | |
1229 | if (write) { | |
d738ce8f FF |
1230 | unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); |
1231 | ||
1232 | if (jif > INT_MAX) | |
1233 | return 1; | |
7d1025e5 | 1234 | WRITE_ONCE(*valp, (int)jif); |
1da177e4 | 1235 | } else { |
7d1025e5 | 1236 | int val = READ_ONCE(*valp); |
1da177e4 LT |
1237 | unsigned long lval; |
1238 | if (val < 0) { | |
00b7c339 | 1239 | *negp = true; |
9a5bc726 | 1240 | lval = -(unsigned long)val; |
1da177e4 | 1241 | } else { |
00b7c339 | 1242 | *negp = false; |
1da177e4 LT |
1243 | lval = (unsigned long)val; |
1244 | } | |
1245 | *lvalp = jiffies_to_msecs(lval); | |
1246 | } | |
1247 | return 0; | |
1248 | } | |
1249 | ||
c381d02b YW |
1250 | static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp, |
1251 | int *valp, int write, void *data) | |
1252 | { | |
1253 | int tmp, ret; | |
1254 | struct do_proc_dointvec_minmax_conv_param *param = data; | |
1255 | /* | |
1256 | * If writing, first do so via a temporary local int so we can | |
1257 | * bounds-check it before touching *valp. | |
1258 | */ | |
1259 | int *ip = write ? &tmp : valp; | |
1260 | ||
1261 | ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data); | |
1262 | if (ret) | |
1263 | return ret; | |
1264 | ||
1265 | if (write) { | |
1266 | if ((param->min && *param->min > tmp) || | |
1267 | (param->max && *param->max < tmp)) | |
1268 | return -EINVAL; | |
1269 | *valp = tmp; | |
1270 | } | |
1271 | return 0; | |
1272 | } | |
1273 | ||
1da177e4 LT |
1274 | /** |
1275 | * proc_dointvec_jiffies - read a vector of integers as seconds | |
1276 | * @table: the sysctl table | |
1277 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1278 | * @buffer: the user buffer |
1279 | * @lenp: the size of the user buffer | |
1280 | * @ppos: file position | |
1281 | * | |
1282 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
374a723c | 1283 | * values from/to the user buffer, treated as an ASCII string. |
1da177e4 LT |
1284 | * The values read are assumed to be in seconds, and are converted into |
1285 | * jiffies. | |
1286 | * | |
1287 | * Returns 0 on success. | |
1288 | */ | |
8d65af78 | 1289 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
32927393 | 1290 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1291 | { |
8d65af78 | 1292 | return do_proc_dointvec(table,write,buffer,lenp,ppos, |
1da177e4 LT |
1293 | do_proc_dointvec_jiffies_conv,NULL); |
1294 | } | |
1295 | ||
c381d02b YW |
1296 | int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1297 | void *buffer, size_t *lenp, loff_t *ppos) | |
1298 | { | |
1299 | struct do_proc_dointvec_minmax_conv_param param = { | |
1300 | .min = (int *) table->extra1, | |
1301 | .max = (int *) table->extra2, | |
1302 | }; | |
1303 | return do_proc_dointvec(table, write, buffer, lenp, ppos, | |
1304 | do_proc_dointvec_ms_jiffies_minmax_conv, ¶m); | |
1305 | } | |
1306 | ||
1da177e4 LT |
1307 | /** |
1308 | * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds | |
1309 | * @table: the sysctl table | |
1310 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1311 | * @buffer: the user buffer |
1312 | * @lenp: the size of the user buffer | |
1e5d5331 | 1313 | * @ppos: pointer to the file position |
1da177e4 LT |
1314 | * |
1315 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
374a723c FK |
1316 | * values from/to the user buffer, treated as an ASCII string. |
1317 | * The values read are assumed to be in 1/USER_HZ seconds, and | |
1da177e4 LT |
1318 | * are converted into jiffies. |
1319 | * | |
1320 | * Returns 0 on success. | |
1321 | */ | |
8d65af78 | 1322 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
32927393 | 1323 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1324 | { |
5bfd5d3e FK |
1325 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1326 | do_proc_dointvec_userhz_jiffies_conv, NULL); | |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | /** | |
1330 | * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds | |
1331 | * @table: the sysctl table | |
1332 | * @write: %TRUE if this is a write to the sysctl file | |
1da177e4 LT |
1333 | * @buffer: the user buffer |
1334 | * @lenp: the size of the user buffer | |
67be2dd1 MW |
1335 | * @ppos: file position |
1336 | * @ppos: the current position in the file | |
1da177e4 LT |
1337 | * |
1338 | * Reads/writes up to table->maxlen/sizeof(unsigned int) integer | |
7d1025e5 KI |
1339 | * values from/to the user buffer, treated as an ASCII string. |
1340 | * The values read are assumed to be in 1/1000 seconds, and | |
1da177e4 LT |
1341 | * are converted into jiffies. |
1342 | * | |
1343 | * Returns 0 on success. | |
1344 | */ | |
32927393 CH |
1345 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer, |
1346 | size_t *lenp, loff_t *ppos) | |
1da177e4 | 1347 | { |
8d65af78 | 1348 | return do_proc_dointvec(table, write, buffer, lenp, ppos, |
1da177e4 LT |
1349 | do_proc_dointvec_ms_jiffies_conv, NULL); |
1350 | } | |
1351 | ||
32927393 CH |
1352 | static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer, |
1353 | size_t *lenp, loff_t *ppos) | |
9ec52099 CLG |
1354 | { |
1355 | struct pid *new_pid; | |
1356 | pid_t tmp; | |
1357 | int r; | |
1358 | ||
6c5f3e7b | 1359 | tmp = pid_vnr(cad_pid); |
9ec52099 | 1360 | |
8d65af78 | 1361 | r = __do_proc_dointvec(&tmp, table, write, buffer, |
9ec52099 CLG |
1362 | lenp, ppos, NULL, NULL); |
1363 | if (r || !write) | |
1364 | return r; | |
1365 | ||
1366 | new_pid = find_get_pid(tmp); | |
1367 | if (!new_pid) | |
1368 | return -ESRCH; | |
1369 | ||
1370 | put_pid(xchg(&cad_pid, new_pid)); | |
1371 | return 0; | |
1372 | } | |
1373 | ||
9f977fb7 OP |
1374 | /** |
1375 | * proc_do_large_bitmap - read/write from/to a large bitmap | |
1376 | * @table: the sysctl table | |
1377 | * @write: %TRUE if this is a write to the sysctl file | |
1378 | * @buffer: the user buffer | |
1379 | * @lenp: the size of the user buffer | |
1380 | * @ppos: file position | |
1381 | * | |
1382 | * The bitmap is stored at table->data and the bitmap length (in bits) | |
1383 | * in table->maxlen. | |
1384 | * | |
1385 | * We use a range comma separated format (e.g. 1,3-4,10-10) so that | |
1386 | * large bitmaps may be represented in a compact manner. Writing into | |
1387 | * the file will clear the bitmap then update it with the given input. | |
1388 | * | |
1389 | * Returns 0 on success. | |
1390 | */ | |
1391 | int proc_do_large_bitmap(struct ctl_table *table, int write, | |
32927393 | 1392 | void *buffer, size_t *lenp, loff_t *ppos) |
9f977fb7 OP |
1393 | { |
1394 | int err = 0; | |
9f977fb7 OP |
1395 | size_t left = *lenp; |
1396 | unsigned long bitmap_len = table->maxlen; | |
122ff243 | 1397 | unsigned long *bitmap = *(unsigned long **) table->data; |
9f977fb7 OP |
1398 | unsigned long *tmp_bitmap = NULL; |
1399 | char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; | |
1400 | ||
122ff243 | 1401 | if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { |
9f977fb7 OP |
1402 | *lenp = 0; |
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | if (write) { | |
32927393 | 1407 | char *p = buffer; |
3116ad38 | 1408 | size_t skipped = 0; |
9f977fb7 | 1409 | |
3116ad38 | 1410 | if (left > PAGE_SIZE - 1) { |
9f977fb7 | 1411 | left = PAGE_SIZE - 1; |
3116ad38 ES |
1412 | /* How much of the buffer we'll skip this pass */ |
1413 | skipped = *lenp - left; | |
1414 | } | |
9f977fb7 | 1415 | |
475dae38 | 1416 | tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL); |
32927393 | 1417 | if (!tmp_bitmap) |
9f977fb7 | 1418 | return -ENOMEM; |
70f6cbb6 | 1419 | proc_skip_char(&p, &left, '\n'); |
9f977fb7 OP |
1420 | while (!err && left) { |
1421 | unsigned long val_a, val_b; | |
1422 | bool neg; | |
3116ad38 | 1423 | size_t saved_left; |
9f977fb7 | 1424 | |
3116ad38 ES |
1425 | /* In case we stop parsing mid-number, we can reset */ |
1426 | saved_left = left; | |
70f6cbb6 | 1427 | err = proc_get_long(&p, &left, &val_a, &neg, tr_a, |
9f977fb7 | 1428 | sizeof(tr_a), &c); |
3116ad38 ES |
1429 | /* |
1430 | * If we consumed the entirety of a truncated buffer or | |
1431 | * only one char is left (may be a "-"), then stop here, | |
1432 | * reset, & come back for more. | |
1433 | */ | |
1434 | if ((left <= 1) && skipped) { | |
1435 | left = saved_left; | |
1436 | break; | |
1437 | } | |
1438 | ||
9f977fb7 OP |
1439 | if (err) |
1440 | break; | |
1441 | if (val_a >= bitmap_len || neg) { | |
1442 | err = -EINVAL; | |
1443 | break; | |
1444 | } | |
1445 | ||
1446 | val_b = val_a; | |
1447 | if (left) { | |
70f6cbb6 | 1448 | p++; |
9f977fb7 OP |
1449 | left--; |
1450 | } | |
1451 | ||
1452 | if (c == '-') { | |
70f6cbb6 | 1453 | err = proc_get_long(&p, &left, &val_b, |
9f977fb7 OP |
1454 | &neg, tr_b, sizeof(tr_b), |
1455 | &c); | |
3116ad38 ES |
1456 | /* |
1457 | * If we consumed all of a truncated buffer or | |
1458 | * then stop here, reset, & come back for more. | |
1459 | */ | |
1460 | if (!left && skipped) { | |
1461 | left = saved_left; | |
1462 | break; | |
1463 | } | |
1464 | ||
9f977fb7 OP |
1465 | if (err) |
1466 | break; | |
1467 | if (val_b >= bitmap_len || neg || | |
1468 | val_a > val_b) { | |
1469 | err = -EINVAL; | |
1470 | break; | |
1471 | } | |
1472 | if (left) { | |
70f6cbb6 | 1473 | p++; |
9f977fb7 OP |
1474 | left--; |
1475 | } | |
1476 | } | |
1477 | ||
5a04cca6 | 1478 | bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); |
70f6cbb6 | 1479 | proc_skip_char(&p, &left, '\n'); |
9f977fb7 | 1480 | } |
3116ad38 | 1481 | left += skipped; |
9f977fb7 OP |
1482 | } else { |
1483 | unsigned long bit_a, bit_b = 0; | |
9a52c5f3 | 1484 | bool first = 1; |
9f977fb7 OP |
1485 | |
1486 | while (left) { | |
1487 | bit_a = find_next_bit(bitmap, bitmap_len, bit_b); | |
1488 | if (bit_a >= bitmap_len) | |
1489 | break; | |
1490 | bit_b = find_next_zero_bit(bitmap, bitmap_len, | |
1491 | bit_a + 1) - 1; | |
1492 | ||
32927393 CH |
1493 | if (!first) |
1494 | proc_put_char(&buffer, &left, ','); | |
1495 | proc_put_long(&buffer, &left, bit_a, false); | |
9f977fb7 | 1496 | if (bit_a != bit_b) { |
32927393 CH |
1497 | proc_put_char(&buffer, &left, '-'); |
1498 | proc_put_long(&buffer, &left, bit_b, false); | |
9f977fb7 OP |
1499 | } |
1500 | ||
1501 | first = 0; bit_b++; | |
1502 | } | |
32927393 | 1503 | proc_put_char(&buffer, &left, '\n'); |
9f977fb7 OP |
1504 | } |
1505 | ||
1506 | if (!err) { | |
1507 | if (write) { | |
1508 | if (*ppos) | |
1509 | bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); | |
1510 | else | |
5a04cca6 | 1511 | bitmap_copy(bitmap, tmp_bitmap, bitmap_len); |
9f977fb7 | 1512 | } |
9f977fb7 OP |
1513 | *lenp -= left; |
1514 | *ppos += *lenp; | |
9f977fb7 | 1515 | } |
f9eb2fdd | 1516 | |
475dae38 | 1517 | bitmap_free(tmp_bitmap); |
f9eb2fdd | 1518 | return err; |
9f977fb7 OP |
1519 | } |
1520 | ||
55610500 | 1521 | #else /* CONFIG_PROC_SYSCTL */ |
1da177e4 | 1522 | |
8d65af78 | 1523 | int proc_dostring(struct ctl_table *table, int write, |
32927393 | 1524 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1525 | { |
1526 | return -ENOSYS; | |
1527 | } | |
1528 | ||
a2071573 JH |
1529 | int proc_dobool(struct ctl_table *table, int write, |
1530 | void *buffer, size_t *lenp, loff_t *ppos) | |
1531 | { | |
1532 | return -ENOSYS; | |
1533 | } | |
1534 | ||
f461d2dc | 1535 | int proc_dointvec(struct ctl_table *table, int write, |
32927393 | 1536 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1537 | { |
1538 | return -ENOSYS; | |
1539 | } | |
1540 | ||
1541 | int proc_douintvec(struct ctl_table *table, int write, | |
32927393 | 1542 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1543 | { |
1544 | return -ENOSYS; | |
1545 | } | |
1546 | ||
1547 | int proc_dointvec_minmax(struct ctl_table *table, int write, | |
32927393 | 1548 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1549 | { |
1550 | return -ENOSYS; | |
1551 | } | |
1552 | ||
1553 | int proc_douintvec_minmax(struct ctl_table *table, int write, | |
32927393 | 1554 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1555 | { |
1556 | return -ENOSYS; | |
9f977fb7 OP |
1557 | } |
1558 | ||
cb944413 ED |
1559 | int proc_dou8vec_minmax(struct ctl_table *table, int write, |
1560 | void *buffer, size_t *lenp, loff_t *ppos) | |
1561 | { | |
1562 | return -ENOSYS; | |
1563 | } | |
1564 | ||
f461d2dc | 1565 | int proc_dointvec_jiffies(struct ctl_table *table, int write, |
32927393 | 1566 | void *buffer, size_t *lenp, loff_t *ppos) |
f461d2dc CH |
1567 | { |
1568 | return -ENOSYS; | |
1569 | } | |
1da177e4 | 1570 | |
c381d02b YW |
1571 | int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
1572 | void *buffer, size_t *lenp, loff_t *ppos) | |
1573 | { | |
1574 | return -ENOSYS; | |
1575 | } | |
1576 | ||
f461d2dc | 1577 | int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, |
32927393 | 1578 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1579 | { |
1580 | return -ENOSYS; | |
1581 | } | |
1582 | ||
f461d2dc | 1583 | int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, |
32927393 | 1584 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1585 | { |
1586 | return -ENOSYS; | |
1587 | } | |
1588 | ||
f461d2dc | 1589 | int proc_doulongvec_minmax(struct ctl_table *table, int write, |
32927393 | 1590 | void *buffer, size_t *lenp, loff_t *ppos) |
e7d316a0 SAK |
1591 | { |
1592 | return -ENOSYS; | |
1593 | } | |
1594 | ||
f461d2dc | 1595 | int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, |
32927393 | 1596 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1597 | { |
32927393 | 1598 | return -ENOSYS; |
1da177e4 LT |
1599 | } |
1600 | ||
f461d2dc | 1601 | int proc_do_large_bitmap(struct ctl_table *table, int write, |
32927393 | 1602 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1603 | { |
1604 | return -ENOSYS; | |
1605 | } | |
1606 | ||
f461d2dc CH |
1607 | #endif /* CONFIG_PROC_SYSCTL */ |
1608 | ||
1609 | #if defined(CONFIG_SYSCTL) | |
1610 | int proc_do_static_key(struct ctl_table *table, int write, | |
32927393 | 1611 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 1612 | { |
f461d2dc CH |
1613 | struct static_key *key = (struct static_key *)table->data; |
1614 | static DEFINE_MUTEX(static_key_mutex); | |
1615 | int val, ret; | |
1616 | struct ctl_table tmp = { | |
1617 | .data = &val, | |
1618 | .maxlen = sizeof(val), | |
1619 | .mode = table->mode, | |
1620 | .extra1 = SYSCTL_ZERO, | |
1621 | .extra2 = SYSCTL_ONE, | |
1622 | }; | |
1623 | ||
1624 | if (write && !capable(CAP_SYS_ADMIN)) | |
1625 | return -EPERM; | |
1626 | ||
1627 | mutex_lock(&static_key_mutex); | |
1628 | val = static_key_enabled(key); | |
1629 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
1630 | if (write && !ret) { | |
1631 | if (val) | |
1632 | static_key_enable(key); | |
1633 | else | |
1634 | static_key_disable(key); | |
1635 | } | |
1636 | mutex_unlock(&static_key_mutex); | |
1637 | return ret; | |
1da177e4 LT |
1638 | } |
1639 | ||
f461d2dc | 1640 | static struct ctl_table kern_table[] = { |
f461d2dc CH |
1641 | { |
1642 | .procname = "panic", | |
1643 | .data = &panic_timeout, | |
1644 | .maxlen = sizeof(int), | |
1645 | .mode = 0644, | |
1646 | .proc_handler = proc_dointvec, | |
1647 | }, | |
f461d2dc CH |
1648 | #ifdef CONFIG_PROC_SYSCTL |
1649 | { | |
1650 | .procname = "tainted", | |
1651 | .maxlen = sizeof(long), | |
1652 | .mode = 0644, | |
1653 | .proc_handler = proc_taint, | |
1654 | }, | |
1655 | { | |
1656 | .procname = "sysctl_writes_strict", | |
1657 | .data = &sysctl_writes_strict, | |
1658 | .maxlen = sizeof(int), | |
1659 | .mode = 0644, | |
1660 | .proc_handler = proc_dointvec_minmax, | |
78e36f3b | 1661 | .extra1 = SYSCTL_NEG_ONE, |
f461d2dc CH |
1662 | .extra2 = SYSCTL_ONE, |
1663 | }, | |
f461d2dc CH |
1664 | #endif |
1665 | { | |
1666 | .procname = "print-fatal-signals", | |
1667 | .data = &print_fatal_signals, | |
1668 | .maxlen = sizeof(int), | |
1669 | .mode = 0644, | |
1670 | .proc_handler = proc_dointvec, | |
1671 | }, | |
1672 | #ifdef CONFIG_SPARC | |
1673 | { | |
1674 | .procname = "reboot-cmd", | |
1675 | .data = reboot_command, | |
1676 | .maxlen = 256, | |
1677 | .mode = 0644, | |
1678 | .proc_handler = proc_dostring, | |
1679 | }, | |
1680 | { | |
1681 | .procname = "stop-a", | |
1682 | .data = &stop_a_enabled, | |
1683 | .maxlen = sizeof (int), | |
1684 | .mode = 0644, | |
1685 | .proc_handler = proc_dointvec, | |
1686 | }, | |
1687 | { | |
1688 | .procname = "scons-poweroff", | |
1689 | .data = &scons_pwroff, | |
1690 | .maxlen = sizeof (int), | |
1691 | .mode = 0644, | |
1692 | .proc_handler = proc_dointvec, | |
1693 | }, | |
1694 | #endif | |
1695 | #ifdef CONFIG_SPARC64 | |
1696 | { | |
1697 | .procname = "tsb-ratio", | |
1698 | .data = &sysctl_tsb_ratio, | |
1699 | .maxlen = sizeof (int), | |
1700 | .mode = 0644, | |
1701 | .proc_handler = proc_dointvec, | |
1702 | }, | |
1703 | #endif | |
1704 | #ifdef CONFIG_PARISC | |
1705 | { | |
1706 | .procname = "soft-power", | |
1707 | .data = &pwrsw_enabled, | |
1708 | .maxlen = sizeof (int), | |
1709 | .mode = 0644, | |
1710 | .proc_handler = proc_dointvec, | |
1711 | }, | |
1712 | #endif | |
1713 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW | |
1714 | { | |
1715 | .procname = "unaligned-trap", | |
1716 | .data = &unaligned_enabled, | |
1717 | .maxlen = sizeof (int), | |
1718 | .mode = 0644, | |
1719 | .proc_handler = proc_dointvec, | |
1720 | }, | |
f461d2dc CH |
1721 | #endif |
1722 | #ifdef CONFIG_STACK_TRACER | |
1723 | { | |
1724 | .procname = "stack_tracer_enabled", | |
1725 | .data = &stack_tracer_enabled, | |
1726 | .maxlen = sizeof(int), | |
1727 | .mode = 0644, | |
1728 | .proc_handler = stack_trace_sysctl, | |
1729 | }, | |
1730 | #endif | |
1731 | #ifdef CONFIG_TRACING | |
1732 | { | |
1733 | .procname = "ftrace_dump_on_oops", | |
1734 | .data = &ftrace_dump_on_oops, | |
1735 | .maxlen = sizeof(int), | |
1736 | .mode = 0644, | |
1737 | .proc_handler = proc_dointvec, | |
1738 | }, | |
1739 | { | |
1740 | .procname = "traceoff_on_warning", | |
1741 | .data = &__disable_trace_on_warning, | |
1742 | .maxlen = sizeof(__disable_trace_on_warning), | |
1743 | .mode = 0644, | |
1744 | .proc_handler = proc_dointvec, | |
1745 | }, | |
1746 | { | |
1747 | .procname = "tracepoint_printk", | |
1748 | .data = &tracepoint_printk, | |
1749 | .maxlen = sizeof(tracepoint_printk), | |
1750 | .mode = 0644, | |
1751 | .proc_handler = tracepoint_printk_sysctl, | |
1752 | }, | |
1753 | #endif | |
f461d2dc CH |
1754 | #ifdef CONFIG_MODULES |
1755 | { | |
1756 | .procname = "modprobe", | |
1757 | .data = &modprobe_path, | |
1758 | .maxlen = KMOD_PATH_LEN, | |
1759 | .mode = 0644, | |
1760 | .proc_handler = proc_dostring, | |
1761 | }, | |
1762 | { | |
1763 | .procname = "modules_disabled", | |
1764 | .data = &modules_disabled, | |
1765 | .maxlen = sizeof(int), | |
1766 | .mode = 0644, | |
1767 | /* only handle a transition from default "0" to "1" */ | |
1768 | .proc_handler = proc_dointvec_minmax, | |
1769 | .extra1 = SYSCTL_ONE, | |
1770 | .extra2 = SYSCTL_ONE, | |
1771 | }, | |
1772 | #endif | |
1773 | #ifdef CONFIG_UEVENT_HELPER | |
1774 | { | |
1775 | .procname = "hotplug", | |
1776 | .data = &uevent_helper, | |
1777 | .maxlen = UEVENT_HELPER_PATH_LEN, | |
1778 | .mode = 0644, | |
1779 | .proc_handler = proc_dostring, | |
1780 | }, | |
1781 | #endif | |
f461d2dc CH |
1782 | #ifdef CONFIG_MAGIC_SYSRQ |
1783 | { | |
1784 | .procname = "sysrq", | |
1785 | .data = NULL, | |
1786 | .maxlen = sizeof (int), | |
1787 | .mode = 0644, | |
1788 | .proc_handler = sysrq_sysctl_handler, | |
1789 | }, | |
1790 | #endif | |
1791 | #ifdef CONFIG_PROC_SYSCTL | |
1792 | { | |
1793 | .procname = "cad_pid", | |
1794 | .data = NULL, | |
1795 | .maxlen = sizeof (int), | |
1796 | .mode = 0600, | |
1797 | .proc_handler = proc_do_cad_pid, | |
1798 | }, | |
1799 | #endif | |
1800 | { | |
1801 | .procname = "threads-max", | |
1802 | .data = NULL, | |
1803 | .maxlen = sizeof(int), | |
1804 | .mode = 0644, | |
1805 | .proc_handler = sysctl_max_threads, | |
1806 | }, | |
f461d2dc CH |
1807 | { |
1808 | .procname = "usermodehelper", | |
1809 | .mode = 0555, | |
1810 | .child = usermodehelper_table, | |
1811 | }, | |
f461d2dc CH |
1812 | { |
1813 | .procname = "overflowuid", | |
1814 | .data = &overflowuid, | |
1815 | .maxlen = sizeof(int), | |
1816 | .mode = 0644, | |
1817 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 1818 | .extra1 = SYSCTL_ZERO, |
54771613 | 1819 | .extra2 = SYSCTL_MAXOLDUID, |
f461d2dc CH |
1820 | }, |
1821 | { | |
1822 | .procname = "overflowgid", | |
1823 | .data = &overflowgid, | |
1824 | .maxlen = sizeof(int), | |
1825 | .mode = 0644, | |
1826 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 1827 | .extra1 = SYSCTL_ZERO, |
54771613 | 1828 | .extra2 = SYSCTL_MAXOLDUID, |
f461d2dc CH |
1829 | }, |
1830 | #ifdef CONFIG_S390 | |
1831 | { | |
1832 | .procname = "userprocess_debug", | |
1833 | .data = &show_unhandled_signals, | |
1834 | .maxlen = sizeof(int), | |
1835 | .mode = 0644, | |
1836 | .proc_handler = proc_dointvec, | |
1837 | }, | |
1838 | #endif | |
1839 | { | |
1840 | .procname = "pid_max", | |
1841 | .data = &pid_max, | |
1842 | .maxlen = sizeof (int), | |
1843 | .mode = 0644, | |
1844 | .proc_handler = proc_dointvec_minmax, | |
1845 | .extra1 = &pid_max_min, | |
1846 | .extra2 = &pid_max_max, | |
1847 | }, | |
1848 | { | |
1849 | .procname = "panic_on_oops", | |
1850 | .data = &panic_on_oops, | |
1851 | .maxlen = sizeof(int), | |
1852 | .mode = 0644, | |
1853 | .proc_handler = proc_dointvec, | |
1854 | }, | |
1855 | { | |
1856 | .procname = "panic_print", | |
1857 | .data = &panic_print, | |
1858 | .maxlen = sizeof(unsigned long), | |
1859 | .mode = 0644, | |
1860 | .proc_handler = proc_doulongvec_minmax, | |
1861 | }, | |
f461d2dc CH |
1862 | { |
1863 | .procname = "ngroups_max", | |
f628867d | 1864 | .data = (void *)&ngroups_max, |
f461d2dc CH |
1865 | .maxlen = sizeof (int), |
1866 | .mode = 0444, | |
1867 | .proc_handler = proc_dointvec, | |
1868 | }, | |
1869 | { | |
1870 | .procname = "cap_last_cap", | |
1871 | .data = (void *)&cap_last_cap, | |
1872 | .maxlen = sizeof(int), | |
1873 | .mode = 0444, | |
1874 | .proc_handler = proc_dointvec, | |
1875 | }, | |
f461d2dc CH |
1876 | #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) |
1877 | { | |
1878 | .procname = "unknown_nmi_panic", | |
1879 | .data = &unknown_nmi_panic, | |
1880 | .maxlen = sizeof (int), | |
1881 | .mode = 0644, | |
1882 | .proc_handler = proc_dointvec, | |
1883 | }, | |
1884 | #endif | |
61d9b56a | 1885 | |
cb8e59cc LT |
1886 | #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \ |
1887 | defined(CONFIG_DEBUG_STACKOVERFLOW) | |
f461d2dc | 1888 | { |
cb8e59cc LT |
1889 | .procname = "panic_on_stackoverflow", |
1890 | .data = &sysctl_panic_on_stackoverflow, | |
f461d2dc CH |
1891 | .maxlen = sizeof(int), |
1892 | .mode = 0644, | |
1893 | .proc_handler = proc_dointvec, | |
1894 | }, | |
cb8e59cc LT |
1895 | #endif |
1896 | #if defined(CONFIG_X86) | |
f461d2dc | 1897 | { |
cb8e59cc LT |
1898 | .procname = "panic_on_unrecovered_nmi", |
1899 | .data = &panic_on_unrecovered_nmi, | |
f461d2dc CH |
1900 | .maxlen = sizeof(int), |
1901 | .mode = 0644, | |
1902 | .proc_handler = proc_dointvec, | |
1903 | }, | |
f461d2dc | 1904 | { |
cb8e59cc LT |
1905 | .procname = "panic_on_io_nmi", |
1906 | .data = &panic_on_io_nmi, | |
f461d2dc CH |
1907 | .maxlen = sizeof(int), |
1908 | .mode = 0644, | |
1909 | .proc_handler = proc_dointvec, | |
1910 | }, | |
f461d2dc CH |
1911 | { |
1912 | .procname = "bootloader_type", | |
1913 | .data = &bootloader_type, | |
1914 | .maxlen = sizeof (int), | |
1915 | .mode = 0444, | |
1916 | .proc_handler = proc_dointvec, | |
1917 | }, | |
1918 | { | |
1919 | .procname = "bootloader_version", | |
1920 | .data = &bootloader_version, | |
1921 | .maxlen = sizeof (int), | |
1922 | .mode = 0444, | |
1923 | .proc_handler = proc_dointvec, | |
1924 | }, | |
1925 | { | |
1926 | .procname = "io_delay_type", | |
1927 | .data = &io_delay_type, | |
1928 | .maxlen = sizeof(int), | |
1929 | .mode = 0644, | |
1930 | .proc_handler = proc_dointvec, | |
1931 | }, | |
1932 | #endif | |
1933 | #if defined(CONFIG_MMU) | |
1934 | { | |
1935 | .procname = "randomize_va_space", | |
1936 | .data = &randomize_va_space, | |
1937 | .maxlen = sizeof(int), | |
1938 | .mode = 0644, | |
1939 | .proc_handler = proc_dointvec, | |
1940 | }, | |
1941 | #endif | |
1942 | #if defined(CONFIG_S390) && defined(CONFIG_SMP) | |
1943 | { | |
1944 | .procname = "spin_retry", | |
1945 | .data = &spin_retry, | |
1946 | .maxlen = sizeof (int), | |
1947 | .mode = 0644, | |
1948 | .proc_handler = proc_dointvec, | |
1949 | }, | |
1950 | #endif | |
1951 | #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) | |
1952 | { | |
1953 | .procname = "acpi_video_flags", | |
1954 | .data = &acpi_realmode_flags, | |
1955 | .maxlen = sizeof (unsigned long), | |
1956 | .mode = 0644, | |
1957 | .proc_handler = proc_doulongvec_minmax, | |
1958 | }, | |
1959 | #endif | |
1960 | #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN | |
1961 | { | |
1962 | .procname = "ignore-unaligned-usertrap", | |
1963 | .data = &no_unaligned_warning, | |
1964 | .maxlen = sizeof (int), | |
1965 | .mode = 0644, | |
1966 | .proc_handler = proc_dointvec, | |
1967 | }, | |
1968 | #endif | |
1969 | #ifdef CONFIG_IA64 | |
1970 | { | |
1971 | .procname = "unaligned-dump-stack", | |
1972 | .data = &unaligned_dump_stack, | |
1973 | .maxlen = sizeof (int), | |
1974 | .mode = 0644, | |
1975 | .proc_handler = proc_dointvec, | |
1976 | }, | |
1977 | #endif | |
f461d2dc CH |
1978 | #ifdef CONFIG_RT_MUTEXES |
1979 | { | |
1980 | .procname = "max_lock_depth", | |
1981 | .data = &max_lock_depth, | |
1982 | .maxlen = sizeof(int), | |
1983 | .mode = 0644, | |
1984 | .proc_handler = proc_dointvec, | |
1985 | }, | |
1986 | #endif | |
f461d2dc CH |
1987 | #ifdef CONFIG_KEYS |
1988 | { | |
1989 | .procname = "keys", | |
1990 | .mode = 0555, | |
1991 | .child = key_sysctls, | |
1992 | }, | |
1993 | #endif | |
1994 | #ifdef CONFIG_PERF_EVENTS | |
1995 | /* | |
1996 | * User-space scripts rely on the existence of this file | |
1997 | * as a feature check for perf_events being enabled. | |
1998 | * | |
1999 | * So it's an ABI, do not remove! | |
2000 | */ | |
2001 | { | |
2002 | .procname = "perf_event_paranoid", | |
2003 | .data = &sysctl_perf_event_paranoid, | |
2004 | .maxlen = sizeof(sysctl_perf_event_paranoid), | |
2005 | .mode = 0644, | |
2006 | .proc_handler = proc_dointvec, | |
2007 | }, | |
2008 | { | |
2009 | .procname = "perf_event_mlock_kb", | |
2010 | .data = &sysctl_perf_event_mlock, | |
2011 | .maxlen = sizeof(sysctl_perf_event_mlock), | |
2012 | .mode = 0644, | |
2013 | .proc_handler = proc_dointvec, | |
2014 | }, | |
2015 | { | |
2016 | .procname = "perf_event_max_sample_rate", | |
2017 | .data = &sysctl_perf_event_sample_rate, | |
2018 | .maxlen = sizeof(sysctl_perf_event_sample_rate), | |
2019 | .mode = 0644, | |
2020 | .proc_handler = perf_proc_update_handler, | |
2021 | .extra1 = SYSCTL_ONE, | |
2022 | }, | |
2023 | { | |
2024 | .procname = "perf_cpu_time_max_percent", | |
2025 | .data = &sysctl_perf_cpu_time_max_percent, | |
2026 | .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), | |
2027 | .mode = 0644, | |
2028 | .proc_handler = perf_cpu_time_max_percent_handler, | |
2029 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2030 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2031 | }, |
2032 | { | |
2033 | .procname = "perf_event_max_stack", | |
2034 | .data = &sysctl_perf_event_max_stack, | |
2035 | .maxlen = sizeof(sysctl_perf_event_max_stack), | |
2036 | .mode = 0644, | |
2037 | .proc_handler = perf_event_max_stack_handler, | |
2038 | .extra1 = SYSCTL_ZERO, | |
d73840ec | 2039 | .extra2 = (void *)&six_hundred_forty_kb, |
f461d2dc CH |
2040 | }, |
2041 | { | |
2042 | .procname = "perf_event_max_contexts_per_stack", | |
2043 | .data = &sysctl_perf_event_max_contexts_per_stack, | |
2044 | .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), | |
2045 | .mode = 0644, | |
2046 | .proc_handler = perf_event_max_stack_handler, | |
2047 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2048 | .extra2 = SYSCTL_ONE_THOUSAND, |
f461d2dc CH |
2049 | }, |
2050 | #endif | |
2051 | { | |
2052 | .procname = "panic_on_warn", | |
2053 | .data = &panic_on_warn, | |
2054 | .maxlen = sizeof(int), | |
2055 | .mode = 0644, | |
2056 | .proc_handler = proc_dointvec_minmax, | |
2057 | .extra1 = SYSCTL_ZERO, | |
2058 | .extra2 = SYSCTL_ONE, | |
2059 | }, | |
7251ceb5 | 2060 | #ifdef CONFIG_TREE_RCU |
f461d2dc CH |
2061 | { |
2062 | .procname = "panic_on_rcu_stall", | |
2063 | .data = &sysctl_panic_on_rcu_stall, | |
2064 | .maxlen = sizeof(sysctl_panic_on_rcu_stall), | |
2065 | .mode = 0644, | |
2066 | .proc_handler = proc_dointvec_minmax, | |
2067 | .extra1 = SYSCTL_ZERO, | |
2068 | .extra2 = SYSCTL_ONE, | |
2069 | }, | |
dfe56404 | 2070 | { |
2071 | .procname = "max_rcu_stall_to_panic", | |
2072 | .data = &sysctl_max_rcu_stall_to_panic, | |
2073 | .maxlen = sizeof(sysctl_max_rcu_stall_to_panic), | |
2074 | .mode = 0644, | |
2075 | .proc_handler = proc_dointvec_minmax, | |
2076 | .extra1 = SYSCTL_ONE, | |
2077 | .extra2 = SYSCTL_INT_MAX, | |
2078 | }, | |
f461d2dc CH |
2079 | #endif |
2080 | { } | |
2081 | }; | |
1da177e4 | 2082 | |
f461d2dc CH |
2083 | static struct ctl_table vm_table[] = { |
2084 | { | |
2085 | .procname = "overcommit_memory", | |
2086 | .data = &sysctl_overcommit_memory, | |
2087 | .maxlen = sizeof(sysctl_overcommit_memory), | |
2088 | .mode = 0644, | |
56f3547b | 2089 | .proc_handler = overcommit_policy_handler, |
f461d2dc | 2090 | .extra1 = SYSCTL_ZERO, |
78e36f3b | 2091 | .extra2 = SYSCTL_TWO, |
f461d2dc | 2092 | }, |
f461d2dc CH |
2093 | { |
2094 | .procname = "overcommit_ratio", | |
2095 | .data = &sysctl_overcommit_ratio, | |
2096 | .maxlen = sizeof(sysctl_overcommit_ratio), | |
2097 | .mode = 0644, | |
2098 | .proc_handler = overcommit_ratio_handler, | |
2099 | }, | |
2100 | { | |
2101 | .procname = "overcommit_kbytes", | |
2102 | .data = &sysctl_overcommit_kbytes, | |
2103 | .maxlen = sizeof(sysctl_overcommit_kbytes), | |
2104 | .mode = 0644, | |
2105 | .proc_handler = overcommit_kbytes_handler, | |
2106 | }, | |
2107 | { | |
2108 | .procname = "page-cluster", | |
2109 | .data = &page_cluster, | |
2110 | .maxlen = sizeof(int), | |
2111 | .mode = 0644, | |
2112 | .proc_handler = proc_dointvec_minmax, | |
2113 | .extra1 = SYSCTL_ZERO, | |
ea0ffd0c | 2114 | .extra2 = (void *)&page_cluster_max, |
f461d2dc | 2115 | }, |
f461d2dc CH |
2116 | { |
2117 | .procname = "dirtytime_expire_seconds", | |
2118 | .data = &dirtytime_expire_interval, | |
2119 | .maxlen = sizeof(dirtytime_expire_interval), | |
2120 | .mode = 0644, | |
2121 | .proc_handler = dirtytime_interval_handler, | |
2122 | .extra1 = SYSCTL_ZERO, | |
2123 | }, | |
2124 | { | |
2125 | .procname = "swappiness", | |
2126 | .data = &vm_swappiness, | |
2127 | .maxlen = sizeof(vm_swappiness), | |
2128 | .mode = 0644, | |
2129 | .proc_handler = proc_dointvec_minmax, | |
2130 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2131 | .extra2 = SYSCTL_TWO_HUNDRED, |
f461d2dc | 2132 | }, |
43b5240c MS |
2133 | #ifdef CONFIG_NUMA |
2134 | { | |
2135 | .procname = "numa_stat", | |
2136 | .data = &sysctl_vm_numa_stat, | |
2137 | .maxlen = sizeof(int), | |
2138 | .mode = 0644, | |
2139 | .proc_handler = sysctl_vm_numa_stat_handler, | |
2140 | .extra1 = SYSCTL_ZERO, | |
2141 | .extra2 = SYSCTL_ONE, | |
2142 | }, | |
f461d2dc CH |
2143 | #endif |
2144 | { | |
2145 | .procname = "lowmem_reserve_ratio", | |
2146 | .data = &sysctl_lowmem_reserve_ratio, | |
2147 | .maxlen = sizeof(sysctl_lowmem_reserve_ratio), | |
2148 | .mode = 0644, | |
2149 | .proc_handler = lowmem_reserve_ratio_sysctl_handler, | |
2150 | }, | |
2151 | { | |
2152 | .procname = "drop_caches", | |
2153 | .data = &sysctl_drop_caches, | |
2154 | .maxlen = sizeof(int), | |
2155 | .mode = 0200, | |
2156 | .proc_handler = drop_caches_sysctl_handler, | |
2157 | .extra1 = SYSCTL_ONE, | |
78e36f3b | 2158 | .extra2 = SYSCTL_FOUR, |
f461d2dc CH |
2159 | }, |
2160 | #ifdef CONFIG_COMPACTION | |
2161 | { | |
2162 | .procname = "compact_memory", | |
ef498438 | 2163 | .data = NULL, |
f461d2dc CH |
2164 | .maxlen = sizeof(int), |
2165 | .mode = 0200, | |
2166 | .proc_handler = sysctl_compaction_handler, | |
2167 | }, | |
facdaa91 NG |
2168 | { |
2169 | .procname = "compaction_proactiveness", | |
2170 | .data = &sysctl_compaction_proactiveness, | |
d34c0a75 | 2171 | .maxlen = sizeof(sysctl_compaction_proactiveness), |
facdaa91 | 2172 | .mode = 0644, |
65d759c8 | 2173 | .proc_handler = compaction_proactiveness_sysctl_handler, |
facdaa91 | 2174 | .extra1 = SYSCTL_ZERO, |
78e36f3b | 2175 | .extra2 = SYSCTL_ONE_HUNDRED, |
facdaa91 | 2176 | }, |
f461d2dc CH |
2177 | { |
2178 | .procname = "extfrag_threshold", | |
2179 | .data = &sysctl_extfrag_threshold, | |
2180 | .maxlen = sizeof(int), | |
2181 | .mode = 0644, | |
2182 | .proc_handler = proc_dointvec_minmax, | |
2452dcb9 | 2183 | .extra1 = SYSCTL_ZERO, |
feb2bd01 | 2184 | .extra2 = SYSCTL_ONE_THOUSAND, |
f461d2dc CH |
2185 | }, |
2186 | { | |
2187 | .procname = "compact_unevictable_allowed", | |
2188 | .data = &sysctl_compact_unevictable_allowed, | |
2189 | .maxlen = sizeof(int), | |
2190 | .mode = 0644, | |
2191 | .proc_handler = proc_dointvec_minmax_warn_RT_change, | |
2192 | .extra1 = SYSCTL_ZERO, | |
2193 | .extra2 = SYSCTL_ONE, | |
2194 | }, | |
1da177e4 | 2195 | |
f461d2dc CH |
2196 | #endif /* CONFIG_COMPACTION */ |
2197 | { | |
2198 | .procname = "min_free_kbytes", | |
2199 | .data = &min_free_kbytes, | |
2200 | .maxlen = sizeof(min_free_kbytes), | |
2201 | .mode = 0644, | |
2202 | .proc_handler = min_free_kbytes_sysctl_handler, | |
2203 | .extra1 = SYSCTL_ZERO, | |
2204 | }, | |
2205 | { | |
2206 | .procname = "watermark_boost_factor", | |
2207 | .data = &watermark_boost_factor, | |
2208 | .maxlen = sizeof(watermark_boost_factor), | |
2209 | .mode = 0644, | |
2210 | .proc_handler = proc_dointvec_minmax, | |
2211 | .extra1 = SYSCTL_ZERO, | |
2212 | }, | |
2213 | { | |
2214 | .procname = "watermark_scale_factor", | |
2215 | .data = &watermark_scale_factor, | |
2216 | .maxlen = sizeof(watermark_scale_factor), | |
2217 | .mode = 0644, | |
2218 | .proc_handler = watermark_scale_factor_sysctl_handler, | |
2219 | .extra1 = SYSCTL_ONE, | |
78e36f3b | 2220 | .extra2 = SYSCTL_THREE_THOUSAND, |
f461d2dc CH |
2221 | }, |
2222 | { | |
74f44822 MG |
2223 | .procname = "percpu_pagelist_high_fraction", |
2224 | .data = &percpu_pagelist_high_fraction, | |
2225 | .maxlen = sizeof(percpu_pagelist_high_fraction), | |
f461d2dc | 2226 | .mode = 0644, |
74f44822 | 2227 | .proc_handler = percpu_pagelist_high_fraction_sysctl_handler, |
f461d2dc CH |
2228 | .extra1 = SYSCTL_ZERO, |
2229 | }, | |
5ef64cc8 LT |
2230 | { |
2231 | .procname = "page_lock_unfairness", | |
2232 | .data = &sysctl_page_lock_unfairness, | |
2233 | .maxlen = sizeof(sysctl_page_lock_unfairness), | |
2234 | .mode = 0644, | |
2235 | .proc_handler = proc_dointvec_minmax, | |
2236 | .extra1 = SYSCTL_ZERO, | |
2237 | }, | |
f461d2dc CH |
2238 | #ifdef CONFIG_MMU |
2239 | { | |
2240 | .procname = "max_map_count", | |
2241 | .data = &sysctl_max_map_count, | |
2242 | .maxlen = sizeof(sysctl_max_map_count), | |
2243 | .mode = 0644, | |
2244 | .proc_handler = proc_dointvec_minmax, | |
2245 | .extra1 = SYSCTL_ZERO, | |
2246 | }, | |
2247 | #else | |
2248 | { | |
2249 | .procname = "nr_trim_pages", | |
2250 | .data = &sysctl_nr_trim_pages, | |
2251 | .maxlen = sizeof(sysctl_nr_trim_pages), | |
2252 | .mode = 0644, | |
2253 | .proc_handler = proc_dointvec_minmax, | |
2254 | .extra1 = SYSCTL_ZERO, | |
2255 | }, | |
2256 | #endif | |
f461d2dc CH |
2257 | { |
2258 | .procname = "vfs_cache_pressure", | |
2259 | .data = &sysctl_vfs_cache_pressure, | |
2260 | .maxlen = sizeof(sysctl_vfs_cache_pressure), | |
2261 | .mode = 0644, | |
3b3376f2 | 2262 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2263 | .extra1 = SYSCTL_ZERO, |
2264 | }, | |
2265 | #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \ | |
2266 | defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT) | |
2267 | { | |
2268 | .procname = "legacy_va_layout", | |
2269 | .data = &sysctl_legacy_va_layout, | |
2270 | .maxlen = sizeof(sysctl_legacy_va_layout), | |
2271 | .mode = 0644, | |
3b3376f2 | 2272 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2273 | .extra1 = SYSCTL_ZERO, |
2274 | }, | |
2275 | #endif | |
2276 | #ifdef CONFIG_NUMA | |
2277 | { | |
2278 | .procname = "zone_reclaim_mode", | |
2279 | .data = &node_reclaim_mode, | |
2280 | .maxlen = sizeof(node_reclaim_mode), | |
2281 | .mode = 0644, | |
3b3376f2 | 2282 | .proc_handler = proc_dointvec_minmax, |
f461d2dc CH |
2283 | .extra1 = SYSCTL_ZERO, |
2284 | }, | |
2285 | { | |
2286 | .procname = "min_unmapped_ratio", | |
2287 | .data = &sysctl_min_unmapped_ratio, | |
2288 | .maxlen = sizeof(sysctl_min_unmapped_ratio), | |
2289 | .mode = 0644, | |
2290 | .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, | |
2291 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2292 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2293 | }, |
2294 | { | |
2295 | .procname = "min_slab_ratio", | |
2296 | .data = &sysctl_min_slab_ratio, | |
2297 | .maxlen = sizeof(sysctl_min_slab_ratio), | |
2298 | .mode = 0644, | |
2299 | .proc_handler = sysctl_min_slab_ratio_sysctl_handler, | |
2300 | .extra1 = SYSCTL_ZERO, | |
78e36f3b | 2301 | .extra2 = SYSCTL_ONE_HUNDRED, |
f461d2dc CH |
2302 | }, |
2303 | #endif | |
2304 | #ifdef CONFIG_SMP | |
2305 | { | |
2306 | .procname = "stat_interval", | |
2307 | .data = &sysctl_stat_interval, | |
2308 | .maxlen = sizeof(sysctl_stat_interval), | |
2309 | .mode = 0644, | |
2310 | .proc_handler = proc_dointvec_jiffies, | |
2311 | }, | |
2312 | { | |
2313 | .procname = "stat_refresh", | |
2314 | .data = NULL, | |
2315 | .maxlen = 0, | |
2316 | .mode = 0600, | |
2317 | .proc_handler = vmstat_refresh, | |
2318 | }, | |
2319 | #endif | |
2320 | #ifdef CONFIG_MMU | |
2321 | { | |
2322 | .procname = "mmap_min_addr", | |
2323 | .data = &dac_mmap_min_addr, | |
2324 | .maxlen = sizeof(unsigned long), | |
2325 | .mode = 0644, | |
2326 | .proc_handler = mmap_min_addr_handler, | |
2327 | }, | |
2328 | #endif | |
2329 | #ifdef CONFIG_NUMA | |
2330 | { | |
2331 | .procname = "numa_zonelist_order", | |
2332 | .data = &numa_zonelist_order, | |
2333 | .maxlen = NUMA_ZONELIST_ORDER_LEN, | |
2334 | .mode = 0644, | |
2335 | .proc_handler = numa_zonelist_order_handler, | |
2336 | }, | |
2337 | #endif | |
2338 | #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ | |
2339 | (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) | |
2340 | { | |
2341 | .procname = "vdso_enabled", | |
2342 | #ifdef CONFIG_X86_32 | |
2343 | .data = &vdso32_enabled, | |
2344 | .maxlen = sizeof(vdso32_enabled), | |
2345 | #else | |
2346 | .data = &vdso_enabled, | |
2347 | .maxlen = sizeof(vdso_enabled), | |
2348 | #endif | |
2349 | .mode = 0644, | |
2350 | .proc_handler = proc_dointvec, | |
2351 | .extra1 = SYSCTL_ZERO, | |
2352 | }, | |
f461d2dc CH |
2353 | #endif |
2354 | { | |
2355 | .procname = "user_reserve_kbytes", | |
2356 | .data = &sysctl_user_reserve_kbytes, | |
2357 | .maxlen = sizeof(sysctl_user_reserve_kbytes), | |
2358 | .mode = 0644, | |
2359 | .proc_handler = proc_doulongvec_minmax, | |
2360 | }, | |
2361 | { | |
2362 | .procname = "admin_reserve_kbytes", | |
2363 | .data = &sysctl_admin_reserve_kbytes, | |
2364 | .maxlen = sizeof(sysctl_admin_reserve_kbytes), | |
2365 | .mode = 0644, | |
2366 | .proc_handler = proc_doulongvec_minmax, | |
2367 | }, | |
2368 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS | |
2369 | { | |
2370 | .procname = "mmap_rnd_bits", | |
2371 | .data = &mmap_rnd_bits, | |
2372 | .maxlen = sizeof(mmap_rnd_bits), | |
2373 | .mode = 0600, | |
2374 | .proc_handler = proc_dointvec_minmax, | |
2375 | .extra1 = (void *)&mmap_rnd_bits_min, | |
2376 | .extra2 = (void *)&mmap_rnd_bits_max, | |
2377 | }, | |
2378 | #endif | |
2379 | #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS | |
2380 | { | |
2381 | .procname = "mmap_rnd_compat_bits", | |
2382 | .data = &mmap_rnd_compat_bits, | |
2383 | .maxlen = sizeof(mmap_rnd_compat_bits), | |
2384 | .mode = 0600, | |
2385 | .proc_handler = proc_dointvec_minmax, | |
2386 | .extra1 = (void *)&mmap_rnd_compat_bits_min, | |
2387 | .extra2 = (void *)&mmap_rnd_compat_bits_max, | |
2388 | }, | |
f461d2dc CH |
2389 | #endif |
2390 | { } | |
2391 | }; | |
1da177e4 | 2392 | |
f461d2dc CH |
2393 | static struct ctl_table debug_table[] = { |
2394 | #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE | |
2395 | { | |
2396 | .procname = "exception-trace", | |
2397 | .data = &show_unhandled_signals, | |
2398 | .maxlen = sizeof(int), | |
2399 | .mode = 0644, | |
2400 | .proc_handler = proc_dointvec | |
2401 | }, | |
f461d2dc CH |
2402 | #endif |
2403 | { } | |
2404 | }; | |
1da177e4 | 2405 | |
f461d2dc CH |
2406 | static struct ctl_table dev_table[] = { |
2407 | { } | |
2408 | }; | |
1da177e4 | 2409 | |
51cb8dfc LC |
2410 | DECLARE_SYSCTL_BASE(kernel, kern_table); |
2411 | DECLARE_SYSCTL_BASE(vm, vm_table); | |
51cb8dfc LC |
2412 | DECLARE_SYSCTL_BASE(debug, debug_table); |
2413 | DECLARE_SYSCTL_BASE(dev, dev_table); | |
1da177e4 | 2414 | |
d8c0418a | 2415 | int __init sysctl_init_bases(void) |
492ecee8 | 2416 | { |
51cb8dfc LC |
2417 | register_sysctl_base(kernel); |
2418 | register_sysctl_base(vm); | |
51cb8dfc LC |
2419 | register_sysctl_base(debug); |
2420 | register_sysctl_base(dev); | |
492ecee8 | 2421 | |
f461d2dc | 2422 | return 0; |
492ecee8 | 2423 | } |
f461d2dc | 2424 | #endif /* CONFIG_SYSCTL */ |
1da177e4 LT |
2425 | /* |
2426 | * No sense putting this after each symbol definition, twice, | |
2427 | * exception granted :-) | |
2428 | */ | |
a2071573 | 2429 | EXPORT_SYMBOL(proc_dobool); |
1da177e4 | 2430 | EXPORT_SYMBOL(proc_dointvec); |
e7d316a0 | 2431 | EXPORT_SYMBOL(proc_douintvec); |
1da177e4 LT |
2432 | EXPORT_SYMBOL(proc_dointvec_jiffies); |
2433 | EXPORT_SYMBOL(proc_dointvec_minmax); | |
61d9b56a | 2434 | EXPORT_SYMBOL_GPL(proc_douintvec_minmax); |
1da177e4 LT |
2435 | EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); |
2436 | EXPORT_SYMBOL(proc_dointvec_ms_jiffies); | |
2437 | EXPORT_SYMBOL(proc_dostring); | |
2438 | EXPORT_SYMBOL(proc_doulongvec_minmax); | |
2439 | EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); | |
0bc19985 | 2440 | EXPORT_SYMBOL(proc_do_large_bitmap); |