1 // SPDX-License-Identifier: GPL-2.0-only
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
22 #include <linux/module.h>
23 #include <linux/aio.h>
24 #include <linux/mm.h>
25 #include <linux/swap.h>
26 #include <linux/slab.h>
27 #include <linux/sysctl.h>
28 #include <linux/bitmap.h>
29 #include <linux/signal.h>
30 #include <linux/printk.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/ctype.h>
34 #include <linux/kmemleak.h>
35 #include <linux/fs.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
70 #include <linux/userfaultfd_k.h>
71 #include <linux/coredump.h>
72 #include <linux/latencytop.h>
73 #include <linux/pid.h>
74
75 #include "../lib/kstrtox.h"
76
77 #include <linux/uaccess.h>
78 #include <asm/processor.h>
79
80 #ifdef CONFIG_X86
81 #include <asm/nmi.h>
82 #include <asm/stacktrace.h>
83 #include <asm/io.h>
84 #endif
85 #ifdef CONFIG_SPARC
86 #include <asm/setup.h>
87 #endif
88 #ifdef CONFIG_BSD_PROCESS_ACCT
89 #include <linux/acct.h>
90 #endif
91 #ifdef CONFIG_RT_MUTEXES
92 #include <linux/rtmutex.h>
93 #endif
94 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
95 #include <linux/lockdep.h>
96 #endif
97 #ifdef CONFIG_CHR_DEV_SG
98 #include <scsi/sg.h>
99 #endif
100 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
101 #include <linux/stackleak.h>
102 #endif
103 #ifdef CONFIG_LOCKUP_DETECTOR
104 #include <linux/nmi.h>
105 #endif
106
107 #if defined(CONFIG_SYSCTL)
108
109 /* Constants used for minimum and maximum */
110 #ifdef CONFIG_LOCKUP_DETECTOR
111 static int sixty = 60;
112 #endif
113
114 static int __maybe_unused neg_one = -1;
115 static int __maybe_unused two = 2;
116 static int __maybe_unused four = 4;
117 static unsigned long zero_ul;
118 static unsigned long one_ul = 1;
119 static unsigned long long_max = LONG_MAX;
120 static int one_hundred = 100;
121 static int two_hundred = 200;
122 static int one_thousand = 1000;
123 #ifdef CONFIG_PRINTK
124 static int ten_thousand = 10000;
125 #endif
126 #ifdef CONFIG_PERF_EVENTS
127 static int six_hundred_forty_kb = 640 * 1024;
128 #endif
129
130 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
131 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
132
133 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
134 static int maxolduid = 65535;
135 static int minolduid;
136
137 static int ngroups_max = NGROUPS_MAX;
138 static const int cap_last_cap = CAP_LAST_CAP;
139
140 /*
141 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
142 * and hung_task_check_interval_secs
143 */
144 #ifdef CONFIG_DETECT_HUNG_TASK
145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
146 #endif
147
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
150 #endif
151
152 #ifdef CONFIG_PROC_SYSCTL
153
154 /**
155 * enum sysctl_writes_mode - supported sysctl write modes
156 *
157 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
158 * to be written, and multiple writes on the same sysctl file descriptor
159 * will rewrite the sysctl value, regardless of file position. No warning
160 * is issued when the initial position is not 0.
161 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
162 * not 0.
163 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
164 * file position 0 and the value must be fully contained in the buffer
165 * sent to the write syscall. If dealing with strings respect the file
166 * position, but restrict this to the max length of the buffer, anything
167 * passed the max length will be ignored. Multiple writes will append
168 * to the buffer.
169 *
170 * These write modes control how current file position affects the behavior of
171 * updating sysctl values through the proc interface on each write.
172 */
173 enum sysctl_writes_mode {
174 SYSCTL_WRITES_LEGACY = -1,
175 SYSCTL_WRITES_WARN = 0,
176 SYSCTL_WRITES_STRICT = 1,
177 };
178
179 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
180 #endif /* CONFIG_PROC_SYSCTL */
181
182 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
183 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
184 int sysctl_legacy_va_layout;
185 #endif
186
187 #ifdef CONFIG_SCHED_DEBUG
188 static int min_sched_granularity_ns = 100000; /* 100 usecs */
189 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
190 static int min_wakeup_granularity_ns; /* 0 usecs */
191 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
192 #ifdef CONFIG_SMP
193 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
194 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
195 #endif /* CONFIG_SMP */
196 #endif /* CONFIG_SCHED_DEBUG */
197
198 #ifdef CONFIG_COMPACTION
199 static int min_extfrag_threshold;
200 static int max_extfrag_threshold = 1000;
201 #endif
202
203 #endif /* CONFIG_SYSCTL */
204
205 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
bpf_stats_handler(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)206 static int bpf_stats_handler(struct ctl_table *table, int write,
207 void *buffer, size_t *lenp, loff_t *ppos)
208 {
209 struct static_key *key = (struct static_key *)table->data;
210 static int saved_val;
211 int val, ret;
212 struct ctl_table tmp = {
213 .data = &val,
214 .maxlen = sizeof(val),
215 .mode = table->mode,
216 .extra1 = SYSCTL_ZERO,
217 .extra2 = SYSCTL_ONE,
218 };
219
220 if (write && !capable(CAP_SYS_ADMIN))
221 return -EPERM;
222
223 mutex_lock(&bpf_stats_enabled_mutex);
224 val = saved_val;
225 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
226 if (write && !ret && val != saved_val) {
227 if (val)
228 static_key_slow_inc(key);
229 else
230 static_key_slow_dec(key);
231 saved_val = val;
232 }
233 mutex_unlock(&bpf_stats_enabled_mutex);
234 return ret;
235 }
236
unpriv_ebpf_notify(int new_state)237 void __weak unpriv_ebpf_notify(int new_state)
238 {
239 }
240
bpf_unpriv_handler(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)241 static int bpf_unpriv_handler(struct ctl_table *table, int write,
242 void *buffer, size_t *lenp, loff_t *ppos)
243 {
244 int ret, unpriv_enable = *(int *)table->data;
245 bool locked_state = unpriv_enable == 1;
246 struct ctl_table tmp = *table;
247
248 if (write && !capable(CAP_SYS_ADMIN))
249 return -EPERM;
250
251 tmp.data = &unpriv_enable;
252 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
253 if (write && !ret) {
254 if (locked_state && unpriv_enable != 1)
255 return -EPERM;
256 *(int *)table->data = unpriv_enable;
257 }
258
259 unpriv_ebpf_notify(unpriv_enable);
260
261 return ret;
262 }
263 #endif /* CONFIG_BPF_SYSCALL && CONFIG_SYSCTL */
264
265 /*
266 * /proc/sys support
267 */
268
269 #ifdef CONFIG_PROC_SYSCTL
270
_proc_do_string(char * data,int maxlen,int write,char * buffer,size_t * lenp,loff_t * ppos)271 static int _proc_do_string(char *data, int maxlen, int write,
272 char *buffer, size_t *lenp, loff_t *ppos)
273 {
274 size_t len;
275 char c, *p;
276
277 if (!data || !maxlen || !*lenp) {
278 *lenp = 0;
279 return 0;
280 }
281
282 if (write) {
283 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
284 /* Only continue writes not past the end of buffer. */
285 len = strlen(data);
286 if (len > maxlen - 1)
287 len = maxlen - 1;
288
289 if (*ppos > len)
290 return 0;
291 len = *ppos;
292 } else {
293 /* Start writing from beginning of buffer. */
294 len = 0;
295 }
296
297 *ppos += *lenp;
298 p = buffer;
299 while ((p - buffer) < *lenp && len < maxlen - 1) {
300 c = *(p++);
301 if (c == 0 || c == '\n')
302 break;
303 data[len++] = c;
304 }
305 data[len] = 0;
306 } else {
307 len = strlen(data);
308 if (len > maxlen)
309 len = maxlen;
310
311 if (*ppos > len) {
312 *lenp = 0;
313 return 0;
314 }
315
316 data += *ppos;
317 len -= *ppos;
318
319 if (len > *lenp)
320 len = *lenp;
321 if (len)
322 memcpy(buffer, data, len);
323 if (len < *lenp) {
324 buffer[len] = '\n';
325 len++;
326 }
327 *lenp = len;
328 *ppos += len;
329 }
330 return 0;
331 }
332
warn_sysctl_write(struct ctl_table * table)333 static void warn_sysctl_write(struct ctl_table *table)
334 {
335 pr_warn_once("%s wrote to %s when file position was not 0!\n"
336 "This will not be supported in the future. To silence this\n"
337 "warning, set kernel.sysctl_writes_strict = -1\n",
338 current->comm, table->procname);
339 }
340
341 /**
342 * proc_first_pos_non_zero_ignore - check if first position is allowed
343 * @ppos: file position
344 * @table: the sysctl table
345 *
346 * Returns true if the first position is non-zero and the sysctl_writes_strict
347 * mode indicates this is not allowed for numeric input types. String proc
348 * handlers can ignore the return value.
349 */
proc_first_pos_non_zero_ignore(loff_t * ppos,struct ctl_table * table)350 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
351 struct ctl_table *table)
352 {
353 if (!*ppos)
354 return false;
355
356 switch (sysctl_writes_strict) {
357 case SYSCTL_WRITES_STRICT:
358 return true;
359 case SYSCTL_WRITES_WARN:
360 warn_sysctl_write(table);
361 return false;
362 default:
363 return false;
364 }
365 }
366
367 /**
368 * proc_dostring - read a string sysctl
369 * @table: the sysctl table
370 * @write: %TRUE if this is a write to the sysctl file
371 * @buffer: the user buffer
372 * @lenp: the size of the user buffer
373 * @ppos: file position
374 *
375 * Reads/writes a string from/to the user buffer. If the kernel
376 * buffer provided is not large enough to hold the string, the
377 * string is truncated. The copied string is %NULL-terminated.
378 * If the string is being read by the user process, it is copied
379 * and a newline '\n' is added. It is truncated if the buffer is
380 * not large enough.
381 *
382 * Returns 0 on success.
383 */
proc_dostring(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)384 int proc_dostring(struct ctl_table *table, int write,
385 void *buffer, size_t *lenp, loff_t *ppos)
386 {
387 if (write)
388 proc_first_pos_non_zero_ignore(ppos, table);
389
390 return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
391 ppos);
392 }
393
proc_skip_spaces(char ** buf,size_t * size)394 static void proc_skip_spaces(char **buf, size_t *size)
395 {
396 while (*size) {
397 if (!isspace(**buf))
398 break;
399 (*size)--;
400 (*buf)++;
401 }
402 }
403
proc_skip_char(char ** buf,size_t * size,const char v)404 static void proc_skip_char(char **buf, size_t *size, const char v)
405 {
406 while (*size) {
407 if (**buf != v)
408 break;
409 (*size)--;
410 (*buf)++;
411 }
412 }
413
414 /**
415 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
416 * fail on overflow
417 *
418 * @cp: kernel buffer containing the string to parse
419 * @endp: pointer to store the trailing characters
420 * @base: the base to use
421 * @res: where the parsed integer will be stored
422 *
423 * In case of success 0 is returned and @res will contain the parsed integer,
424 * @endp will hold any trailing characters.
425 * This function will fail the parse on overflow. If there wasn't an overflow
426 * the function will defer the decision what characters count as invalid to the
427 * caller.
428 */
strtoul_lenient(const char * cp,char ** endp,unsigned int base,unsigned long * res)429 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
430 unsigned long *res)
431 {
432 unsigned long long result;
433 unsigned int rv;
434
435 cp = _parse_integer_fixup_radix(cp, &base);
436 rv = _parse_integer(cp, base, &result);
437 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
438 return -ERANGE;
439
440 cp += rv;
441
442 if (endp)
443 *endp = (char *)cp;
444
445 *res = (unsigned long)result;
446 return 0;
447 }
448
449 #define TMPBUFLEN 22
450 /**
451 * proc_get_long - reads an ASCII formatted integer from a user buffer
452 *
453 * @buf: a kernel buffer
454 * @size: size of the kernel buffer
455 * @val: this is where the number will be stored
456 * @neg: set to %TRUE if number is negative
457 * @perm_tr: a vector which contains the allowed trailers
458 * @perm_tr_len: size of the perm_tr vector
459 * @tr: pointer to store the trailer character
460 *
461 * In case of success %0 is returned and @buf and @size are updated with
462 * the amount of bytes read. If @tr is non-NULL and a trailing
463 * character exists (size is non-zero after returning from this
464 * function), @tr is updated with the trailing character.
465 */
proc_get_long(char ** buf,size_t * size,unsigned long * val,bool * neg,const char * perm_tr,unsigned perm_tr_len,char * tr)466 static int proc_get_long(char **buf, size_t *size,
467 unsigned long *val, bool *neg,
468 const char *perm_tr, unsigned perm_tr_len, char *tr)
469 {
470 char *p, tmp[TMPBUFLEN];
471 ssize_t len = *size;
472
473 if (len <= 0)
474 return -EINVAL;
475
476 if (len > TMPBUFLEN - 1)
477 len = TMPBUFLEN - 1;
478
479 memcpy(tmp, *buf, len);
480
481 tmp[len] = 0;
482 p = tmp;
483 if (*p == '-' && *size > 1) {
484 *neg = true;
485 p++;
486 } else
487 *neg = false;
488 if (!isdigit(*p))
489 return -EINVAL;
490
491 if (strtoul_lenient(p, &p, 0, val))
492 return -EINVAL;
493
494 len = p - tmp;
495
496 /* We don't know if the next char is whitespace thus we may accept
497 * invalid integers (e.g. 1234...a) or two integers instead of one
498 * (e.g. 123...1). So lets not allow such large numbers. */
499 if (len == TMPBUFLEN - 1)
500 return -EINVAL;
501
502 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
503 return -EINVAL;
504
505 if (tr && (len < *size))
506 *tr = *p;
507
508 *buf += len;
509 *size -= len;
510
511 return 0;
512 }
513
514 /**
515 * proc_put_long - converts an integer to a decimal ASCII formatted string
516 *
517 * @buf: the user buffer
518 * @size: the size of the user buffer
519 * @val: the integer to be converted
520 * @neg: sign of the number, %TRUE for negative
521 *
522 * In case of success @buf and @size are updated with the amount of bytes
523 * written.
524 */
proc_put_long(void ** buf,size_t * size,unsigned long val,bool neg)525 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
526 {
527 int len;
528 char tmp[TMPBUFLEN], *p = tmp;
529
530 sprintf(p, "%s%lu", neg ? "-" : "", val);
531 len = strlen(tmp);
532 if (len > *size)
533 len = *size;
534 memcpy(*buf, tmp, len);
535 *size -= len;
536 *buf += len;
537 }
538 #undef TMPBUFLEN
539
proc_put_char(void ** buf,size_t * size,char c)540 static void proc_put_char(void **buf, size_t *size, char c)
541 {
542 if (*size) {
543 char **buffer = (char **)buf;
544 **buffer = c;
545
546 (*size)--;
547 (*buffer)++;
548 *buf = *buffer;
549 }
550 }
551
do_proc_dointvec_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)552 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
553 int *valp,
554 int write, void *data)
555 {
556 if (write) {
557 if (*negp) {
558 if (*lvalp > (unsigned long) INT_MAX + 1)
559 return -EINVAL;
560 *valp = -*lvalp;
561 } else {
562 if (*lvalp > (unsigned long) INT_MAX)
563 return -EINVAL;
564 *valp = *lvalp;
565 }
566 } else {
567 int val = *valp;
568 if (val < 0) {
569 *negp = true;
570 *lvalp = -(unsigned long)val;
571 } else {
572 *negp = false;
573 *lvalp = (unsigned long)val;
574 }
575 }
576 return 0;
577 }
578
do_proc_douintvec_conv(unsigned long * lvalp,unsigned int * valp,int write,void * data)579 static int do_proc_douintvec_conv(unsigned long *lvalp,
580 unsigned int *valp,
581 int write, void *data)
582 {
583 if (write) {
584 if (*lvalp > UINT_MAX)
585 return -EINVAL;
586 *valp = *lvalp;
587 } else {
588 unsigned int val = *valp;
589 *lvalp = (unsigned long)val;
590 }
591 return 0;
592 }
593
594 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
595
__do_proc_dointvec(void * tbl_data,struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos,int (* conv)(bool * negp,unsigned long * lvalp,int * valp,int write,void * data),void * data)596 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
597 int write, void *buffer,
598 size_t *lenp, loff_t *ppos,
599 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
600 int write, void *data),
601 void *data)
602 {
603 int *i, vleft, first = 1, err = 0;
604 size_t left;
605 char *p;
606
607 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
608 *lenp = 0;
609 return 0;
610 }
611
612 i = (int *) tbl_data;
613 vleft = table->maxlen / sizeof(*i);
614 left = *lenp;
615
616 if (!conv)
617 conv = do_proc_dointvec_conv;
618
619 if (write) {
620 if (proc_first_pos_non_zero_ignore(ppos, table))
621 goto out;
622
623 if (left > PAGE_SIZE - 1)
624 left = PAGE_SIZE - 1;
625 p = buffer;
626 }
627
628 for (; left && vleft--; i++, first=0) {
629 unsigned long lval;
630 bool neg;
631
632 if (write) {
633 proc_skip_spaces(&p, &left);
634
635 if (!left)
636 break;
637 err = proc_get_long(&p, &left, &lval, &neg,
638 proc_wspace_sep,
639 sizeof(proc_wspace_sep), NULL);
640 if (err)
641 break;
642 if (conv(&neg, &lval, i, 1, data)) {
643 err = -EINVAL;
644 break;
645 }
646 } else {
647 if (conv(&neg, &lval, i, 0, data)) {
648 err = -EINVAL;
649 break;
650 }
651 if (!first)
652 proc_put_char(&buffer, &left, '\t');
653 proc_put_long(&buffer, &left, lval, neg);
654 }
655 }
656
657 if (!write && !first && left && !err)
658 proc_put_char(&buffer, &left, '\n');
659 if (write && !err && left)
660 proc_skip_spaces(&p, &left);
661 if (write && first)
662 return err ? : -EINVAL;
663 *lenp -= left;
664 out:
665 *ppos += *lenp;
666 return err;
667 }
668
do_proc_dointvec(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos,int (* conv)(bool * negp,unsigned long * lvalp,int * valp,int write,void * data),void * data)669 static int do_proc_dointvec(struct ctl_table *table, int write,
670 void *buffer, size_t *lenp, loff_t *ppos,
671 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
672 int write, void *data),
673 void *data)
674 {
675 return __do_proc_dointvec(table->data, table, write,
676 buffer, lenp, ppos, conv, data);
677 }
678
do_proc_douintvec_w(unsigned int * tbl_data,struct ctl_table * table,void * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)679 static int do_proc_douintvec_w(unsigned int *tbl_data,
680 struct ctl_table *table,
681 void *buffer,
682 size_t *lenp, loff_t *ppos,
683 int (*conv)(unsigned long *lvalp,
684 unsigned int *valp,
685 int write, void *data),
686 void *data)
687 {
688 unsigned long lval;
689 int err = 0;
690 size_t left;
691 bool neg;
692 char *p = buffer;
693
694 left = *lenp;
695
696 if (proc_first_pos_non_zero_ignore(ppos, table))
697 goto bail_early;
698
699 if (left > PAGE_SIZE - 1)
700 left = PAGE_SIZE - 1;
701
702 proc_skip_spaces(&p, &left);
703 if (!left) {
704 err = -EINVAL;
705 goto out_free;
706 }
707
708 err = proc_get_long(&p, &left, &lval, &neg,
709 proc_wspace_sep,
710 sizeof(proc_wspace_sep), NULL);
711 if (err || neg) {
712 err = -EINVAL;
713 goto out_free;
714 }
715
716 if (conv(&lval, tbl_data, 1, data)) {
717 err = -EINVAL;
718 goto out_free;
719 }
720
721 if (!err && left)
722 proc_skip_spaces(&p, &left);
723
724 out_free:
725 if (err)
726 return -EINVAL;
727
728 return 0;
729
730 /* This is in keeping with old __do_proc_dointvec() */
731 bail_early:
732 *ppos += *lenp;
733 return err;
734 }
735
do_proc_douintvec_r(unsigned int * tbl_data,void * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)736 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
737 size_t *lenp, loff_t *ppos,
738 int (*conv)(unsigned long *lvalp,
739 unsigned int *valp,
740 int write, void *data),
741 void *data)
742 {
743 unsigned long lval;
744 int err = 0;
745 size_t left;
746
747 left = *lenp;
748
749 if (conv(&lval, tbl_data, 0, data)) {
750 err = -EINVAL;
751 goto out;
752 }
753
754 proc_put_long(&buffer, &left, lval, false);
755 if (!left)
756 goto out;
757
758 proc_put_char(&buffer, &left, '\n');
759
760 out:
761 *lenp -= left;
762 *ppos += *lenp;
763
764 return err;
765 }
766
__do_proc_douintvec(void * tbl_data,struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)767 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
768 int write, void *buffer,
769 size_t *lenp, loff_t *ppos,
770 int (*conv)(unsigned long *lvalp,
771 unsigned int *valp,
772 int write, void *data),
773 void *data)
774 {
775 unsigned int *i, vleft;
776
777 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
778 *lenp = 0;
779 return 0;
780 }
781
782 i = (unsigned int *) tbl_data;
783 vleft = table->maxlen / sizeof(*i);
784
785 /*
786 * Arrays are not supported, keep this simple. *Do not* add
787 * support for them.
788 */
789 if (vleft != 1) {
790 *lenp = 0;
791 return -EINVAL;
792 }
793
794 if (!conv)
795 conv = do_proc_douintvec_conv;
796
797 if (write)
798 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
799 conv, data);
800 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
801 }
802
do_proc_douintvec(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)803 static int do_proc_douintvec(struct ctl_table *table, int write,
804 void *buffer, size_t *lenp, loff_t *ppos,
805 int (*conv)(unsigned long *lvalp,
806 unsigned int *valp,
807 int write, void *data),
808 void *data)
809 {
810 return __do_proc_douintvec(table->data, table, write,
811 buffer, lenp, ppos, conv, data);
812 }
813
814 /**
815 * proc_dointvec - read a vector of integers
816 * @table: the sysctl table
817 * @write: %TRUE if this is a write to the sysctl file
818 * @buffer: the user buffer
819 * @lenp: the size of the user buffer
820 * @ppos: file position
821 *
822 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
823 * values from/to the user buffer, treated as an ASCII string.
824 *
825 * Returns 0 on success.
826 */
proc_dointvec(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)827 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
828 size_t *lenp, loff_t *ppos)
829 {
830 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
831 }
832
833 #ifdef CONFIG_COMPACTION
proc_dointvec_minmax_warn_RT_change(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)834 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
835 int write, void *buffer, size_t *lenp, loff_t *ppos)
836 {
837 int ret, old;
838
839 if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
840 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
841
842 old = *(int *)table->data;
843 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
844 if (ret)
845 return ret;
846 if (old != *(int *)table->data)
847 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
848 table->procname, current->comm,
849 task_pid_nr(current));
850 return ret;
851 }
852 #endif
853
854 /**
855 * proc_douintvec - read a vector of unsigned integers
856 * @table: the sysctl table
857 * @write: %TRUE if this is a write to the sysctl file
858 * @buffer: the user buffer
859 * @lenp: the size of the user buffer
860 * @ppos: file position
861 *
862 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
863 * values from/to the user buffer, treated as an ASCII string.
864 *
865 * Returns 0 on success.
866 */
proc_douintvec(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)867 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
868 size_t *lenp, loff_t *ppos)
869 {
870 return do_proc_douintvec(table, write, buffer, lenp, ppos,
871 do_proc_douintvec_conv, NULL);
872 }
873
874 /*
875 * Taint values can only be increased
876 * This means we can safely use a temporary.
877 */
proc_taint(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)878 static int proc_taint(struct ctl_table *table, int write,
879 void *buffer, size_t *lenp, loff_t *ppos)
880 {
881 struct ctl_table t;
882 unsigned long tmptaint = get_taint();
883 int err;
884
885 if (write && !capable(CAP_SYS_ADMIN))
886 return -EPERM;
887
888 t = *table;
889 t.data = &tmptaint;
890 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
891 if (err < 0)
892 return err;
893
894 if (write) {
895 int i;
896
897 /*
898 * If we are relying on panic_on_taint not producing
899 * false positives due to userspace input, bail out
900 * before setting the requested taint flags.
901 */
902 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
903 return -EINVAL;
904
905 /*
906 * Poor man's atomic or. Not worth adding a primitive
907 * to everyone's atomic.h for this
908 */
909 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
910 if ((1UL << i) & tmptaint)
911 add_taint(i, LOCKDEP_STILL_OK);
912 }
913
914 return err;
915 }
916
917 #ifdef CONFIG_PRINTK
proc_dointvec_minmax_sysadmin(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)918 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
919 void *buffer, size_t *lenp, loff_t *ppos)
920 {
921 if (write && !capable(CAP_SYS_ADMIN))
922 return -EPERM;
923
924 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
925 }
926 #endif
927
928 /**
929 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
930 * @min: pointer to minimum allowable value
931 * @max: pointer to maximum allowable value
932 *
933 * The do_proc_dointvec_minmax_conv_param structure provides the
934 * minimum and maximum values for doing range checking for those sysctl
935 * parameters that use the proc_dointvec_minmax() handler.
936 */
937 struct do_proc_dointvec_minmax_conv_param {
938 int *min;
939 int *max;
940 };
941
do_proc_dointvec_minmax_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)942 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
943 int *valp,
944 int write, void *data)
945 {
946 int tmp, ret;
947 struct do_proc_dointvec_minmax_conv_param *param = data;
948 /*
949 * If writing, first do so via a temporary local int so we can
950 * bounds-check it before touching *valp.
951 */
952 int *ip = write ? &tmp : valp;
953
954 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
955 if (ret)
956 return ret;
957
958 if (write) {
959 if ((param->min && *param->min > tmp) ||
960 (param->max && *param->max < tmp))
961 return -EINVAL;
962 *valp = tmp;
963 }
964
965 return 0;
966 }
967
968 /**
969 * proc_dointvec_minmax - read a vector of integers with min/max values
970 * @table: the sysctl table
971 * @write: %TRUE if this is a write to the sysctl file
972 * @buffer: the user buffer
973 * @lenp: the size of the user buffer
974 * @ppos: file position
975 *
976 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
977 * values from/to the user buffer, treated as an ASCII string.
978 *
979 * This routine will ensure the values are within the range specified by
980 * table->extra1 (min) and table->extra2 (max).
981 *
982 * Returns 0 on success or -EINVAL on write when the range check fails.
983 */
proc_dointvec_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)984 int proc_dointvec_minmax(struct ctl_table *table, int write,
985 void *buffer, size_t *lenp, loff_t *ppos)
986 {
987 struct do_proc_dointvec_minmax_conv_param param = {
988 .min = (int *) table->extra1,
989 .max = (int *) table->extra2,
990 };
991 return do_proc_dointvec(table, write, buffer, lenp, ppos,
992 do_proc_dointvec_minmax_conv, ¶m);
993 }
994
995 /**
996 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
997 * @min: pointer to minimum allowable value
998 * @max: pointer to maximum allowable value
999 *
1000 * The do_proc_douintvec_minmax_conv_param structure provides the
1001 * minimum and maximum values for doing range checking for those sysctl
1002 * parameters that use the proc_douintvec_minmax() handler.
1003 */
1004 struct do_proc_douintvec_minmax_conv_param {
1005 unsigned int *min;
1006 unsigned int *max;
1007 };
1008
do_proc_douintvec_minmax_conv(unsigned long * lvalp,unsigned int * valp,int write,void * data)1009 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
1010 unsigned int *valp,
1011 int write, void *data)
1012 {
1013 int ret;
1014 unsigned int tmp;
1015 struct do_proc_douintvec_minmax_conv_param *param = data;
1016 /* write via temporary local uint for bounds-checking */
1017 unsigned int *up = write ? &tmp : valp;
1018
1019 ret = do_proc_douintvec_conv(lvalp, up, write, data);
1020 if (ret)
1021 return ret;
1022
1023 if (write) {
1024 if ((param->min && *param->min > tmp) ||
1025 (param->max && *param->max < tmp))
1026 return -ERANGE;
1027
1028 *valp = tmp;
1029 }
1030
1031 return 0;
1032 }
1033
1034 /**
1035 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1036 * @table: the sysctl table
1037 * @write: %TRUE if this is a write to the sysctl file
1038 * @buffer: the user buffer
1039 * @lenp: the size of the user buffer
1040 * @ppos: file position
1041 *
1042 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1043 * values from/to the user buffer, treated as an ASCII string. Negative
1044 * strings are not allowed.
1045 *
1046 * This routine will ensure the values are within the range specified by
1047 * table->extra1 (min) and table->extra2 (max). There is a final sanity
1048 * check for UINT_MAX to avoid having to support wrap around uses from
1049 * userspace.
1050 *
1051 * Returns 0 on success or -ERANGE on write when the range check fails.
1052 */
proc_douintvec_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1053 int proc_douintvec_minmax(struct ctl_table *table, int write,
1054 void *buffer, size_t *lenp, loff_t *ppos)
1055 {
1056 struct do_proc_douintvec_minmax_conv_param param = {
1057 .min = (unsigned int *) table->extra1,
1058 .max = (unsigned int *) table->extra2,
1059 };
1060 return do_proc_douintvec(table, write, buffer, lenp, ppos,
1061 do_proc_douintvec_minmax_conv, ¶m);
1062 }
1063
do_proc_dopipe_max_size_conv(unsigned long * lvalp,unsigned int * valp,int write,void * data)1064 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
1065 unsigned int *valp,
1066 int write, void *data)
1067 {
1068 if (write) {
1069 unsigned int val;
1070
1071 val = round_pipe_size(*lvalp);
1072 if (val == 0)
1073 return -EINVAL;
1074
1075 *valp = val;
1076 } else {
1077 unsigned int val = *valp;
1078 *lvalp = (unsigned long) val;
1079 }
1080
1081 return 0;
1082 }
1083
proc_dopipe_max_size(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1084 static int proc_dopipe_max_size(struct ctl_table *table, int write,
1085 void *buffer, size_t *lenp, loff_t *ppos)
1086 {
1087 return do_proc_douintvec(table, write, buffer, lenp, ppos,
1088 do_proc_dopipe_max_size_conv, NULL);
1089 }
1090
validate_coredump_safety(void)1091 static void validate_coredump_safety(void)
1092 {
1093 #ifdef CONFIG_COREDUMP
1094 if (suid_dumpable == SUID_DUMP_ROOT &&
1095 core_pattern[0] != '/' && core_pattern[0] != '|') {
1096 printk(KERN_WARNING
1097 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
1098 "Pipe handler or fully qualified core dump path required.\n"
1099 "Set kernel.core_pattern before fs.suid_dumpable.\n"
1100 );
1101 }
1102 #endif
1103 }
1104
proc_dointvec_minmax_coredump(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1105 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
1106 void *buffer, size_t *lenp, loff_t *ppos)
1107 {
1108 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1109 if (!error)
1110 validate_coredump_safety();
1111 return error;
1112 }
1113
1114 #ifdef CONFIG_COREDUMP
proc_dostring_coredump(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1115 static int proc_dostring_coredump(struct ctl_table *table, int write,
1116 void *buffer, size_t *lenp, loff_t *ppos)
1117 {
1118 int error = proc_dostring(table, write, buffer, lenp, ppos);
1119 if (!error)
1120 validate_coredump_safety();
1121 return error;
1122 }
1123 #endif
1124
1125 #ifdef CONFIG_MAGIC_SYSRQ
sysrq_sysctl_handler(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1126 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1127 void *buffer, size_t *lenp, loff_t *ppos)
1128 {
1129 int tmp, ret;
1130
1131 tmp = sysrq_mask();
1132
1133 ret = __do_proc_dointvec(&tmp, table, write, buffer,
1134 lenp, ppos, NULL, NULL);
1135 if (ret || !write)
1136 return ret;
1137
1138 if (write)
1139 sysrq_toggle_support(tmp);
1140
1141 return 0;
1142 }
1143 #endif
1144
__do_proc_doulongvec_minmax(void * data,struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos,unsigned long convmul,unsigned long convdiv)1145 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1146 int write, void *buffer, size_t *lenp, loff_t *ppos,
1147 unsigned long convmul, unsigned long convdiv)
1148 {
1149 unsigned long *i, *min, *max;
1150 int vleft, first = 1, err = 0;
1151 size_t left;
1152 char *p;
1153
1154 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1155 *lenp = 0;
1156 return 0;
1157 }
1158
1159 i = (unsigned long *) data;
1160 min = (unsigned long *) table->extra1;
1161 max = (unsigned long *) table->extra2;
1162 vleft = table->maxlen / sizeof(unsigned long);
1163 left = *lenp;
1164
1165 if (write) {
1166 if (proc_first_pos_non_zero_ignore(ppos, table))
1167 goto out;
1168
1169 if (left > PAGE_SIZE - 1)
1170 left = PAGE_SIZE - 1;
1171 p = buffer;
1172 }
1173
1174 for (; left && vleft--; i++, first = 0) {
1175 unsigned long val;
1176
1177 if (write) {
1178 bool neg;
1179
1180 proc_skip_spaces(&p, &left);
1181 if (!left)
1182 break;
1183
1184 err = proc_get_long(&p, &left, &val, &neg,
1185 proc_wspace_sep,
1186 sizeof(proc_wspace_sep), NULL);
1187 if (err)
1188 break;
1189 if (neg)
1190 continue;
1191 val = convmul * val / convdiv;
1192 if ((min && val < *min) || (max && val > *max)) {
1193 err = -EINVAL;
1194 break;
1195 }
1196 *i = val;
1197 } else {
1198 val = convdiv * (*i) / convmul;
1199 if (!first)
1200 proc_put_char(&buffer, &left, '\t');
1201 proc_put_long(&buffer, &left, val, false);
1202 }
1203 }
1204
1205 if (!write && !first && left && !err)
1206 proc_put_char(&buffer, &left, '\n');
1207 if (write && !err)
1208 proc_skip_spaces(&p, &left);
1209 if (write && first)
1210 return err ? : -EINVAL;
1211 *lenp -= left;
1212 out:
1213 *ppos += *lenp;
1214 return err;
1215 }
1216
do_proc_doulongvec_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos,unsigned long convmul,unsigned long convdiv)1217 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1218 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1219 unsigned long convdiv)
1220 {
1221 return __do_proc_doulongvec_minmax(table->data, table, write,
1222 buffer, lenp, ppos, convmul, convdiv);
1223 }
1224
1225 /**
1226 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1227 * @table: the sysctl table
1228 * @write: %TRUE if this is a write to the sysctl file
1229 * @buffer: the user buffer
1230 * @lenp: the size of the user buffer
1231 * @ppos: file position
1232 *
1233 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1234 * values from/to the user buffer, treated as an ASCII string.
1235 *
1236 * This routine will ensure the values are within the range specified by
1237 * table->extra1 (min) and table->extra2 (max).
1238 *
1239 * Returns 0 on success.
1240 */
proc_doulongvec_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1241 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1242 void *buffer, size_t *lenp, loff_t *ppos)
1243 {
1244 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1245 }
1246
1247 /**
1248 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1249 * @table: the sysctl table
1250 * @write: %TRUE if this is a write to the sysctl file
1251 * @buffer: the user buffer
1252 * @lenp: the size of the user buffer
1253 * @ppos: file position
1254 *
1255 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1256 * values from/to the user buffer, treated as an ASCII string. The values
1257 * are treated as milliseconds, and converted to jiffies when they are stored.
1258 *
1259 * This routine will ensure the values are within the range specified by
1260 * table->extra1 (min) and table->extra2 (max).
1261 *
1262 * Returns 0 on success.
1263 */
proc_doulongvec_ms_jiffies_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1264 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1265 void *buffer, size_t *lenp, loff_t *ppos)
1266 {
1267 return do_proc_doulongvec_minmax(table, write, buffer,
1268 lenp, ppos, HZ, 1000l);
1269 }
1270
1271
do_proc_dointvec_jiffies_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)1272 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1273 int *valp,
1274 int write, void *data)
1275 {
1276 if (write) {
1277 if (*lvalp > INT_MAX / HZ)
1278 return 1;
1279 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1280 } else {
1281 int val = *valp;
1282 unsigned long lval;
1283 if (val < 0) {
1284 *negp = true;
1285 lval = -(unsigned long)val;
1286 } else {
1287 *negp = false;
1288 lval = (unsigned long)val;
1289 }
1290 *lvalp = lval / HZ;
1291 }
1292 return 0;
1293 }
1294
do_proc_dointvec_userhz_jiffies_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)1295 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1296 int *valp,
1297 int write, void *data)
1298 {
1299 if (write) {
1300 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1301 return 1;
1302 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1303 } else {
1304 int val = *valp;
1305 unsigned long lval;
1306 if (val < 0) {
1307 *negp = true;
1308 lval = -(unsigned long)val;
1309 } else {
1310 *negp = false;
1311 lval = (unsigned long)val;
1312 }
1313 *lvalp = jiffies_to_clock_t(lval);
1314 }
1315 return 0;
1316 }
1317
do_proc_dointvec_ms_jiffies_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)1318 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1319 int *valp,
1320 int write, void *data)
1321 {
1322 if (write) {
1323 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1324
1325 if (jif > INT_MAX)
1326 return 1;
1327 *valp = (int)jif;
1328 } else {
1329 int val = *valp;
1330 unsigned long lval;
1331 if (val < 0) {
1332 *negp = true;
1333 lval = -(unsigned long)val;
1334 } else {
1335 *negp = false;
1336 lval = (unsigned long)val;
1337 }
1338 *lvalp = jiffies_to_msecs(lval);
1339 }
1340 return 0;
1341 }
1342
1343 /**
1344 * proc_dointvec_jiffies - read a vector of integers as seconds
1345 * @table: the sysctl table
1346 * @write: %TRUE if this is a write to the sysctl file
1347 * @buffer: the user buffer
1348 * @lenp: the size of the user buffer
1349 * @ppos: file position
1350 *
1351 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1352 * values from/to the user buffer, treated as an ASCII string.
1353 * The values read are assumed to be in seconds, and are converted into
1354 * jiffies.
1355 *
1356 * Returns 0 on success.
1357 */
proc_dointvec_jiffies(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1358 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1359 void *buffer, size_t *lenp, loff_t *ppos)
1360 {
1361 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1362 do_proc_dointvec_jiffies_conv,NULL);
1363 }
1364
1365 /**
1366 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1367 * @table: the sysctl table
1368 * @write: %TRUE if this is a write to the sysctl file
1369 * @buffer: the user buffer
1370 * @lenp: the size of the user buffer
1371 * @ppos: pointer to the file position
1372 *
1373 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1374 * values from/to the user buffer, treated as an ASCII string.
1375 * The values read are assumed to be in 1/USER_HZ seconds, and
1376 * are converted into jiffies.
1377 *
1378 * Returns 0 on success.
1379 */
proc_dointvec_userhz_jiffies(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1380 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1381 void *buffer, size_t *lenp, loff_t *ppos)
1382 {
1383 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1384 do_proc_dointvec_userhz_jiffies_conv,NULL);
1385 }
1386
1387 /**
1388 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1389 * @table: the sysctl table
1390 * @write: %TRUE if this is a write to the sysctl file
1391 * @buffer: the user buffer
1392 * @lenp: the size of the user buffer
1393 * @ppos: file position
1394 * @ppos: the current position in the file
1395 *
1396 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1397 * values from/to the user buffer, treated as an ASCII string.
1398 * The values read are assumed to be in 1/1000 seconds, and
1399 * are converted into jiffies.
1400 *
1401 * Returns 0 on success.
1402 */
proc_dointvec_ms_jiffies(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1403 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1404 size_t *lenp, loff_t *ppos)
1405 {
1406 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1407 do_proc_dointvec_ms_jiffies_conv, NULL);
1408 }
1409
proc_do_cad_pid(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1410 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1411 size_t *lenp, loff_t *ppos)
1412 {
1413 struct pid *new_pid;
1414 pid_t tmp;
1415 int r;
1416
1417 tmp = pid_vnr(cad_pid);
1418
1419 r = __do_proc_dointvec(&tmp, table, write, buffer,
1420 lenp, ppos, NULL, NULL);
1421 if (r || !write)
1422 return r;
1423
1424 new_pid = find_get_pid(tmp);
1425 if (!new_pid)
1426 return -ESRCH;
1427
1428 put_pid(xchg(&cad_pid, new_pid));
1429 return 0;
1430 }
1431
1432 /**
1433 * proc_do_large_bitmap - read/write from/to a large bitmap
1434 * @table: the sysctl table
1435 * @write: %TRUE if this is a write to the sysctl file
1436 * @buffer: the user buffer
1437 * @lenp: the size of the user buffer
1438 * @ppos: file position
1439 *
1440 * The bitmap is stored at table->data and the bitmap length (in bits)
1441 * in table->maxlen.
1442 *
1443 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1444 * large bitmaps may be represented in a compact manner. Writing into
1445 * the file will clear the bitmap then update it with the given input.
1446 *
1447 * Returns 0 on success.
1448 */
proc_do_large_bitmap(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1449 int proc_do_large_bitmap(struct ctl_table *table, int write,
1450 void *buffer, size_t *lenp, loff_t *ppos)
1451 {
1452 int err = 0;
1453 bool first = 1;
1454 size_t left = *lenp;
1455 unsigned long bitmap_len = table->maxlen;
1456 unsigned long *bitmap = *(unsigned long **) table->data;
1457 unsigned long *tmp_bitmap = NULL;
1458 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1459
1460 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1461 *lenp = 0;
1462 return 0;
1463 }
1464
1465 if (write) {
1466 char *p = buffer;
1467 size_t skipped = 0;
1468
1469 if (left > PAGE_SIZE - 1) {
1470 left = PAGE_SIZE - 1;
1471 /* How much of the buffer we'll skip this pass */
1472 skipped = *lenp - left;
1473 }
1474
1475 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1476 if (!tmp_bitmap)
1477 return -ENOMEM;
1478 proc_skip_char(&p, &left, '\n');
1479 while (!err && left) {
1480 unsigned long val_a, val_b;
1481 bool neg;
1482 size_t saved_left;
1483
1484 /* In case we stop parsing mid-number, we can reset */
1485 saved_left = left;
1486 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1487 sizeof(tr_a), &c);
1488 /*
1489 * If we consumed the entirety of a truncated buffer or
1490 * only one char is left (may be a "-"), then stop here,
1491 * reset, & come back for more.
1492 */
1493 if ((left <= 1) && skipped) {
1494 left = saved_left;
1495 break;
1496 }
1497
1498 if (err)
1499 break;
1500 if (val_a >= bitmap_len || neg) {
1501 err = -EINVAL;
1502 break;
1503 }
1504
1505 val_b = val_a;
1506 if (left) {
1507 p++;
1508 left--;
1509 }
1510
1511 if (c == '-') {
1512 err = proc_get_long(&p, &left, &val_b,
1513 &neg, tr_b, sizeof(tr_b),
1514 &c);
1515 /*
1516 * If we consumed all of a truncated buffer or
1517 * then stop here, reset, & come back for more.
1518 */
1519 if (!left && skipped) {
1520 left = saved_left;
1521 break;
1522 }
1523
1524 if (err)
1525 break;
1526 if (val_b >= bitmap_len || neg ||
1527 val_a > val_b) {
1528 err = -EINVAL;
1529 break;
1530 }
1531 if (left) {
1532 p++;
1533 left--;
1534 }
1535 }
1536
1537 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1538 first = 0;
1539 proc_skip_char(&p, &left, '\n');
1540 }
1541 left += skipped;
1542 } else {
1543 unsigned long bit_a, bit_b = 0;
1544
1545 while (left) {
1546 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1547 if (bit_a >= bitmap_len)
1548 break;
1549 bit_b = find_next_zero_bit(bitmap, bitmap_len,
1550 bit_a + 1) - 1;
1551
1552 if (!first)
1553 proc_put_char(&buffer, &left, ',');
1554 proc_put_long(&buffer, &left, bit_a, false);
1555 if (bit_a != bit_b) {
1556 proc_put_char(&buffer, &left, '-');
1557 proc_put_long(&buffer, &left, bit_b, false);
1558 }
1559
1560 first = 0; bit_b++;
1561 }
1562 proc_put_char(&buffer, &left, '\n');
1563 }
1564
1565 if (!err) {
1566 if (write) {
1567 if (*ppos)
1568 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1569 else
1570 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1571 }
1572 *lenp -= left;
1573 *ppos += *lenp;
1574 }
1575
1576 bitmap_free(tmp_bitmap);
1577 return err;
1578 }
1579
1580 #else /* CONFIG_PROC_SYSCTL */
1581
proc_dostring(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1582 int proc_dostring(struct ctl_table *table, int write,
1583 void *buffer, size_t *lenp, loff_t *ppos)
1584 {
1585 return -ENOSYS;
1586 }
1587
proc_dointvec(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1588 int proc_dointvec(struct ctl_table *table, int write,
1589 void *buffer, size_t *lenp, loff_t *ppos)
1590 {
1591 return -ENOSYS;
1592 }
1593
proc_douintvec(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1594 int proc_douintvec(struct ctl_table *table, int write,
1595 void *buffer, size_t *lenp, loff_t *ppos)
1596 {
1597 return -ENOSYS;
1598 }
1599
proc_dointvec_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1600 int proc_dointvec_minmax(struct ctl_table *table, int write,
1601 void *buffer, size_t *lenp, loff_t *ppos)
1602 {
1603 return -ENOSYS;
1604 }
1605
proc_douintvec_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1606 int proc_douintvec_minmax(struct ctl_table *table, int write,
1607 void *buffer, size_t *lenp, loff_t *ppos)
1608 {
1609 return -ENOSYS;
1610 }
1611
proc_dointvec_jiffies(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1612 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1613 void *buffer, size_t *lenp, loff_t *ppos)
1614 {
1615 return -ENOSYS;
1616 }
1617
proc_dointvec_userhz_jiffies(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1618 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1619 void *buffer, size_t *lenp, loff_t *ppos)
1620 {
1621 return -ENOSYS;
1622 }
1623
proc_dointvec_ms_jiffies(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1624 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1625 void *buffer, size_t *lenp, loff_t *ppos)
1626 {
1627 return -ENOSYS;
1628 }
1629
proc_doulongvec_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1630 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1631 void *buffer, size_t *lenp, loff_t *ppos)
1632 {
1633 return -ENOSYS;
1634 }
1635
proc_doulongvec_ms_jiffies_minmax(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1636 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1637 void *buffer, size_t *lenp, loff_t *ppos)
1638 {
1639 return -ENOSYS;
1640 }
1641
proc_do_large_bitmap(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1642 int proc_do_large_bitmap(struct ctl_table *table, int write,
1643 void *buffer, size_t *lenp, loff_t *ppos)
1644 {
1645 return -ENOSYS;
1646 }
1647
1648 #endif /* CONFIG_PROC_SYSCTL */
1649
1650 #if defined(CONFIG_SYSCTL)
proc_do_static_key(struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1651 int proc_do_static_key(struct ctl_table *table, int write,
1652 void *buffer, size_t *lenp, loff_t *ppos)
1653 {
1654 struct static_key *key = (struct static_key *)table->data;
1655 static DEFINE_MUTEX(static_key_mutex);
1656 int val, ret;
1657 struct ctl_table tmp = {
1658 .data = &val,
1659 .maxlen = sizeof(val),
1660 .mode = table->mode,
1661 .extra1 = SYSCTL_ZERO,
1662 .extra2 = SYSCTL_ONE,
1663 };
1664
1665 if (write && !capable(CAP_SYS_ADMIN))
1666 return -EPERM;
1667
1668 mutex_lock(&static_key_mutex);
1669 val = static_key_enabled(key);
1670 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1671 if (write && !ret) {
1672 if (val)
1673 static_key_enable(key);
1674 else
1675 static_key_disable(key);
1676 }
1677 mutex_unlock(&static_key_mutex);
1678 return ret;
1679 }
1680
1681 static struct ctl_table kern_table[] = {
1682 {
1683 .procname = "sched_child_runs_first",
1684 .data = &sysctl_sched_child_runs_first,
1685 .maxlen = sizeof(unsigned int),
1686 .mode = 0644,
1687 .proc_handler = proc_dointvec,
1688 },
1689 #ifdef CONFIG_SCHED_RT_CAS
1690 {
1691 .procname = "sched_enable_rt_cas",
1692 .data = &sysctl_sched_enable_rt_cas,
1693 .maxlen = sizeof(unsigned int),
1694 .mode = 0644,
1695 .proc_handler = proc_dointvec,
1696 },
1697 #endif
1698 #ifdef CONFIG_SCHED_RT_ACTIVE_LB
1699 {
1700 .procname = "sched_enable_rt_active_lb",
1701 .data = &sysctl_sched_enable_rt_active_lb,
1702 .maxlen = sizeof(unsigned int),
1703 .mode = 0644,
1704 .proc_handler = proc_dointvec,
1705 },
1706 #endif
1707 #ifdef CONFIG_SCHED_WALT
1708 {
1709 .procname = "sched_use_walt_cpu_util",
1710 .data = &sysctl_sched_use_walt_cpu_util,
1711 .maxlen = sizeof(unsigned int),
1712 .mode = 0644,
1713 .proc_handler = proc_dointvec_minmax,
1714 .extra1 = SYSCTL_ZERO,
1715 .extra2 = SYSCTL_ONE,
1716 },
1717 {
1718 .procname = "sched_use_walt_task_util",
1719 .data = &sysctl_sched_use_walt_task_util,
1720 .maxlen = sizeof(unsigned int),
1721 .mode = 0644,
1722 .proc_handler = proc_dointvec_minmax,
1723 .extra1 = SYSCTL_ZERO,
1724 .extra2 = SYSCTL_ONE,
1725 },
1726 {
1727 .procname = "sched_walt_init_task_load_pct",
1728 .data = &sysctl_sched_walt_init_task_load_pct,
1729 .maxlen = sizeof(unsigned int),
1730 .mode = 0644,
1731 .proc_handler = sysctl_sched_walt_init_task_load_pct_sysctl_handler,
1732 },
1733 {
1734 .procname = "sched_cpu_high_irqload",
1735 .data = &sysctl_sched_cpu_high_irqload,
1736 .maxlen = sizeof(unsigned int),
1737 .mode = 0644,
1738 .proc_handler = proc_dointvec,
1739 },
1740 #endif
1741 #ifdef CONFIG_SCHED_DEBUG
1742 {
1743 .procname = "sched_min_granularity_ns",
1744 .data = &sysctl_sched_min_granularity,
1745 .maxlen = sizeof(unsigned int),
1746 .mode = 0644,
1747 .proc_handler = sched_proc_update_handler,
1748 .extra1 = &min_sched_granularity_ns,
1749 .extra2 = &max_sched_granularity_ns,
1750 },
1751 {
1752 .procname = "sched_latency_ns",
1753 .data = &sysctl_sched_latency,
1754 .maxlen = sizeof(unsigned int),
1755 .mode = 0644,
1756 .proc_handler = sched_proc_update_handler,
1757 .extra1 = &min_sched_granularity_ns,
1758 .extra2 = &max_sched_granularity_ns,
1759 },
1760 {
1761 .procname = "sched_wakeup_granularity_ns",
1762 .data = &sysctl_sched_wakeup_granularity,
1763 .maxlen = sizeof(unsigned int),
1764 .mode = 0644,
1765 .proc_handler = sched_proc_update_handler,
1766 .extra1 = &min_wakeup_granularity_ns,
1767 .extra2 = &max_wakeup_granularity_ns,
1768 },
1769 #ifdef CONFIG_SMP
1770 {
1771 .procname = "sched_tunable_scaling",
1772 .data = &sysctl_sched_tunable_scaling,
1773 .maxlen = sizeof(enum sched_tunable_scaling),
1774 .mode = 0644,
1775 .proc_handler = sched_proc_update_handler,
1776 .extra1 = &min_sched_tunable_scaling,
1777 .extra2 = &max_sched_tunable_scaling,
1778 },
1779 {
1780 .procname = "sched_migration_cost_ns",
1781 .data = &sysctl_sched_migration_cost,
1782 .maxlen = sizeof(unsigned int),
1783 .mode = 0644,
1784 .proc_handler = proc_dointvec,
1785 },
1786 {
1787 .procname = "sched_nr_migrate",
1788 .data = &sysctl_sched_nr_migrate,
1789 .maxlen = sizeof(unsigned int),
1790 .mode = 0644,
1791 .proc_handler = proc_dointvec,
1792 },
1793 #ifdef CONFIG_SCHEDSTATS
1794 {
1795 .procname = "sched_schedstats",
1796 .data = NULL,
1797 .maxlen = sizeof(unsigned int),
1798 .mode = 0644,
1799 .proc_handler = sysctl_schedstats,
1800 .extra1 = SYSCTL_ZERO,
1801 .extra2 = SYSCTL_ONE,
1802 },
1803 #endif /* CONFIG_SCHEDSTATS */
1804 #endif /* CONFIG_SMP */
1805 #ifdef CONFIG_NUMA_BALANCING
1806 {
1807 .procname = "numa_balancing_scan_delay_ms",
1808 .data = &sysctl_numa_balancing_scan_delay,
1809 .maxlen = sizeof(unsigned int),
1810 .mode = 0644,
1811 .proc_handler = proc_dointvec,
1812 },
1813 {
1814 .procname = "numa_balancing_scan_period_min_ms",
1815 .data = &sysctl_numa_balancing_scan_period_min,
1816 .maxlen = sizeof(unsigned int),
1817 .mode = 0644,
1818 .proc_handler = proc_dointvec,
1819 },
1820 {
1821 .procname = "numa_balancing_scan_period_max_ms",
1822 .data = &sysctl_numa_balancing_scan_period_max,
1823 .maxlen = sizeof(unsigned int),
1824 .mode = 0644,
1825 .proc_handler = proc_dointvec,
1826 },
1827 {
1828 .procname = "numa_balancing_scan_size_mb",
1829 .data = &sysctl_numa_balancing_scan_size,
1830 .maxlen = sizeof(unsigned int),
1831 .mode = 0644,
1832 .proc_handler = proc_dointvec_minmax,
1833 .extra1 = SYSCTL_ONE,
1834 },
1835 {
1836 .procname = "numa_balancing",
1837 .data = NULL, /* filled in by handler */
1838 .maxlen = sizeof(unsigned int),
1839 .mode = 0644,
1840 .proc_handler = sysctl_numa_balancing,
1841 .extra1 = SYSCTL_ZERO,
1842 .extra2 = SYSCTL_ONE,
1843 },
1844 #endif /* CONFIG_NUMA_BALANCING */
1845 #endif /* CONFIG_SCHED_DEBUG */
1846 {
1847 .procname = "sched_rt_period_us",
1848 .data = &sysctl_sched_rt_period,
1849 .maxlen = sizeof(unsigned int),
1850 .mode = 0644,
1851 .proc_handler = sched_rt_handler,
1852 },
1853 {
1854 .procname = "sched_rt_runtime_us",
1855 .data = &sysctl_sched_rt_runtime,
1856 .maxlen = sizeof(int),
1857 .mode = 0644,
1858 .proc_handler = sched_rt_handler,
1859 },
1860 {
1861 .procname = "sched_deadline_period_max_us",
1862 .data = &sysctl_sched_dl_period_max,
1863 .maxlen = sizeof(unsigned int),
1864 .mode = 0644,
1865 .proc_handler = proc_dointvec,
1866 },
1867 {
1868 .procname = "sched_deadline_period_min_us",
1869 .data = &sysctl_sched_dl_period_min,
1870 .maxlen = sizeof(unsigned int),
1871 .mode = 0644,
1872 .proc_handler = proc_dointvec,
1873 },
1874 {
1875 .procname = "sched_rr_timeslice_ms",
1876 .data = &sysctl_sched_rr_timeslice,
1877 .maxlen = sizeof(int),
1878 .mode = 0644,
1879 .proc_handler = sched_rr_handler,
1880 },
1881 #ifdef CONFIG_UCLAMP_TASK
1882 {
1883 .procname = "sched_util_clamp_min",
1884 .data = &sysctl_sched_uclamp_util_min,
1885 .maxlen = sizeof(unsigned int),
1886 .mode = 0644,
1887 .proc_handler = sysctl_sched_uclamp_handler,
1888 },
1889 {
1890 .procname = "sched_util_clamp_max",
1891 .data = &sysctl_sched_uclamp_util_max,
1892 .maxlen = sizeof(unsigned int),
1893 .mode = 0644,
1894 .proc_handler = sysctl_sched_uclamp_handler,
1895 },
1896 {
1897 .procname = "sched_util_clamp_min_rt_default",
1898 .data = &sysctl_sched_uclamp_util_min_rt_default,
1899 .maxlen = sizeof(unsigned int),
1900 .mode = 0644,
1901 .proc_handler = sysctl_sched_uclamp_handler,
1902 },
1903 #endif
1904 #ifdef CONFIG_SCHED_AUTOGROUP
1905 {
1906 .procname = "sched_autogroup_enabled",
1907 .data = &sysctl_sched_autogroup_enabled,
1908 .maxlen = sizeof(unsigned int),
1909 .mode = 0644,
1910 .proc_handler = proc_dointvec_minmax,
1911 .extra1 = SYSCTL_ZERO,
1912 .extra2 = SYSCTL_ONE,
1913 },
1914 #endif
1915 #ifdef CONFIG_CFS_BANDWIDTH
1916 {
1917 .procname = "sched_cfs_bandwidth_slice_us",
1918 .data = &sysctl_sched_cfs_bandwidth_slice,
1919 .maxlen = sizeof(unsigned int),
1920 .mode = 0644,
1921 .proc_handler = proc_dointvec_minmax,
1922 .extra1 = SYSCTL_ONE,
1923 },
1924 #endif
1925 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1926 {
1927 .procname = "sched_energy_aware",
1928 .data = &sysctl_sched_energy_aware,
1929 .maxlen = sizeof(unsigned int),
1930 .mode = 0644,
1931 .proc_handler = sched_energy_aware_handler,
1932 .extra1 = SYSCTL_ZERO,
1933 .extra2 = SYSCTL_ONE,
1934 },
1935 #endif
1936 #ifdef CONFIG_PROVE_LOCKING
1937 {
1938 .procname = "prove_locking",
1939 .data = &prove_locking,
1940 .maxlen = sizeof(int),
1941 .mode = 0644,
1942 .proc_handler = proc_dointvec,
1943 },
1944 #endif
1945 #ifdef CONFIG_LOCK_STAT
1946 {
1947 .procname = "lock_stat",
1948 .data = &lock_stat,
1949 .maxlen = sizeof(int),
1950 .mode = 0644,
1951 .proc_handler = proc_dointvec,
1952 },
1953 #endif
1954 {
1955 .procname = "panic",
1956 .data = &panic_timeout,
1957 .maxlen = sizeof(int),
1958 .mode = 0644,
1959 .proc_handler = proc_dointvec,
1960 },
1961 #ifdef CONFIG_COREDUMP
1962 {
1963 .procname = "core_uses_pid",
1964 .data = &core_uses_pid,
1965 .maxlen = sizeof(int),
1966 .mode = 0644,
1967 .proc_handler = proc_dointvec,
1968 },
1969 {
1970 .procname = "core_pattern",
1971 .data = core_pattern,
1972 .maxlen = CORENAME_MAX_SIZE,
1973 .mode = 0644,
1974 .proc_handler = proc_dostring_coredump,
1975 },
1976 {
1977 .procname = "core_pipe_limit",
1978 .data = &core_pipe_limit,
1979 .maxlen = sizeof(unsigned int),
1980 .mode = 0644,
1981 .proc_handler = proc_dointvec,
1982 },
1983 #endif
1984 #ifdef CONFIG_PROC_SYSCTL
1985 {
1986 .procname = "tainted",
1987 .maxlen = sizeof(long),
1988 .mode = 0644,
1989 .proc_handler = proc_taint,
1990 },
1991 {
1992 .procname = "sysctl_writes_strict",
1993 .data = &sysctl_writes_strict,
1994 .maxlen = sizeof(int),
1995 .mode = 0644,
1996 .proc_handler = proc_dointvec_minmax,
1997 .extra1 = &neg_one,
1998 .extra2 = SYSCTL_ONE,
1999 },
2000 #endif
2001 #ifdef CONFIG_LATENCYTOP
2002 {
2003 .procname = "latencytop",
2004 .data = &latencytop_enabled,
2005 .maxlen = sizeof(int),
2006 .mode = 0644,
2007 .proc_handler = sysctl_latencytop,
2008 },
2009 #endif
2010 #ifdef CONFIG_BLK_DEV_INITRD
2011 {
2012 .procname = "real-root-dev",
2013 .data = &real_root_dev,
2014 .maxlen = sizeof(int),
2015 .mode = 0644,
2016 .proc_handler = proc_dointvec,
2017 },
2018 #endif
2019 {
2020 .procname = "print-fatal-signals",
2021 .data = &print_fatal_signals,
2022 .maxlen = sizeof(int),
2023 .mode = 0644,
2024 .proc_handler = proc_dointvec,
2025 },
2026 #ifdef CONFIG_SPARC
2027 {
2028 .procname = "reboot-cmd",
2029 .data = reboot_command,
2030 .maxlen = 256,
2031 .mode = 0644,
2032 .proc_handler = proc_dostring,
2033 },
2034 {
2035 .procname = "stop-a",
2036 .data = &stop_a_enabled,
2037 .maxlen = sizeof (int),
2038 .mode = 0644,
2039 .proc_handler = proc_dointvec,
2040 },
2041 {
2042 .procname = "scons-poweroff",
2043 .data = &scons_pwroff,
2044 .maxlen = sizeof (int),
2045 .mode = 0644,
2046 .proc_handler = proc_dointvec,
2047 },
2048 #endif
2049 #ifdef CONFIG_SPARC64
2050 {
2051 .procname = "tsb-ratio",
2052 .data = &sysctl_tsb_ratio,
2053 .maxlen = sizeof (int),
2054 .mode = 0644,
2055 .proc_handler = proc_dointvec,
2056 },
2057 #endif
2058 #ifdef CONFIG_PARISC
2059 {
2060 .procname = "soft-power",
2061 .data = &pwrsw_enabled,
2062 .maxlen = sizeof (int),
2063 .mode = 0644,
2064 .proc_handler = proc_dointvec,
2065 },
2066 #endif
2067 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
2068 {
2069 .procname = "unaligned-trap",
2070 .data = &unaligned_enabled,
2071 .maxlen = sizeof (int),
2072 .mode = 0644,
2073 .proc_handler = proc_dointvec,
2074 },
2075 #endif
2076 {
2077 .procname = "ctrl-alt-del",
2078 .data = &C_A_D,
2079 .maxlen = sizeof(int),
2080 .mode = 0644,
2081 .proc_handler = proc_dointvec,
2082 },
2083 #ifdef CONFIG_FUNCTION_TRACER
2084 {
2085 .procname = "ftrace_enabled",
2086 .data = &ftrace_enabled,
2087 .maxlen = sizeof(int),
2088 .mode = 0644,
2089 .proc_handler = ftrace_enable_sysctl,
2090 },
2091 #endif
2092 #ifdef CONFIG_STACK_TRACER
2093 {
2094 .procname = "stack_tracer_enabled",
2095 .data = &stack_tracer_enabled,
2096 .maxlen = sizeof(int),
2097 .mode = 0644,
2098 .proc_handler = stack_trace_sysctl,
2099 },
2100 #endif
2101 #ifdef CONFIG_TRACING
2102 {
2103 .procname = "ftrace_dump_on_oops",
2104 .data = &ftrace_dump_on_oops,
2105 .maxlen = sizeof(int),
2106 .mode = 0644,
2107 .proc_handler = proc_dointvec,
2108 },
2109 {
2110 .procname = "traceoff_on_warning",
2111 .data = &__disable_trace_on_warning,
2112 .maxlen = sizeof(__disable_trace_on_warning),
2113 .mode = 0644,
2114 .proc_handler = proc_dointvec,
2115 },
2116 {
2117 .procname = "tracepoint_printk",
2118 .data = &tracepoint_printk,
2119 .maxlen = sizeof(tracepoint_printk),
2120 .mode = 0644,
2121 .proc_handler = tracepoint_printk_sysctl,
2122 },
2123 #endif
2124 #ifdef CONFIG_KEXEC_CORE
2125 {
2126 .procname = "kexec_load_disabled",
2127 .data = &kexec_load_disabled,
2128 .maxlen = sizeof(int),
2129 .mode = 0644,
2130 /* only handle a transition from default "0" to "1" */
2131 .proc_handler = proc_dointvec_minmax,
2132 .extra1 = SYSCTL_ONE,
2133 .extra2 = SYSCTL_ONE,
2134 },
2135 #endif
2136 #ifdef CONFIG_MODULES
2137 {
2138 .procname = "modprobe",
2139 .data = &modprobe_path,
2140 .maxlen = KMOD_PATH_LEN,
2141 .mode = 0644,
2142 .proc_handler = proc_dostring,
2143 },
2144 {
2145 .procname = "modules_disabled",
2146 .data = &modules_disabled,
2147 .maxlen = sizeof(int),
2148 .mode = 0644,
2149 /* only handle a transition from default "0" to "1" */
2150 .proc_handler = proc_dointvec_minmax,
2151 .extra1 = SYSCTL_ONE,
2152 .extra2 = SYSCTL_ONE,
2153 },
2154 #endif
2155 #ifdef CONFIG_UEVENT_HELPER
2156 {
2157 .procname = "hotplug",
2158 .data = &uevent_helper,
2159 .maxlen = UEVENT_HELPER_PATH_LEN,
2160 .mode = 0644,
2161 .proc_handler = proc_dostring,
2162 },
2163 #endif
2164 #ifdef CONFIG_CHR_DEV_SG
2165 {
2166 .procname = "sg-big-buff",
2167 .data = &sg_big_buff,
2168 .maxlen = sizeof (int),
2169 .mode = 0444,
2170 .proc_handler = proc_dointvec,
2171 },
2172 #endif
2173 #ifdef CONFIG_BSD_PROCESS_ACCT
2174 {
2175 .procname = "acct",
2176 .data = &acct_parm,
2177 .maxlen = 3*sizeof(int),
2178 .mode = 0644,
2179 .proc_handler = proc_dointvec,
2180 },
2181 #endif
2182 #ifdef CONFIG_MAGIC_SYSRQ
2183 {
2184 .procname = "sysrq",
2185 .data = NULL,
2186 .maxlen = sizeof (int),
2187 .mode = 0644,
2188 .proc_handler = sysrq_sysctl_handler,
2189 },
2190 #endif
2191 #ifdef CONFIG_PROC_SYSCTL
2192 {
2193 .procname = "cad_pid",
2194 .data = NULL,
2195 .maxlen = sizeof (int),
2196 .mode = 0600,
2197 .proc_handler = proc_do_cad_pid,
2198 },
2199 #endif
2200 {
2201 .procname = "threads-max",
2202 .data = NULL,
2203 .maxlen = sizeof(int),
2204 .mode = 0644,
2205 .proc_handler = sysctl_max_threads,
2206 },
2207 {
2208 .procname = "random",
2209 .mode = 0555,
2210 .child = random_table,
2211 },
2212 {
2213 .procname = "usermodehelper",
2214 .mode = 0555,
2215 .child = usermodehelper_table,
2216 },
2217 #ifdef CONFIG_FW_LOADER_USER_HELPER
2218 {
2219 .procname = "firmware_config",
2220 .mode = 0555,
2221 .child = firmware_config_table,
2222 },
2223 #endif
2224 {
2225 .procname = "overflowuid",
2226 .data = &overflowuid,
2227 .maxlen = sizeof(int),
2228 .mode = 0644,
2229 .proc_handler = proc_dointvec_minmax,
2230 .extra1 = &minolduid,
2231 .extra2 = &maxolduid,
2232 },
2233 {
2234 .procname = "overflowgid",
2235 .data = &overflowgid,
2236 .maxlen = sizeof(int),
2237 .mode = 0644,
2238 .proc_handler = proc_dointvec_minmax,
2239 .extra1 = &minolduid,
2240 .extra2 = &maxolduid,
2241 },
2242 #ifdef CONFIG_S390
2243 {
2244 .procname = "userprocess_debug",
2245 .data = &show_unhandled_signals,
2246 .maxlen = sizeof(int),
2247 .mode = 0644,
2248 .proc_handler = proc_dointvec,
2249 },
2250 #endif
2251 #ifdef CONFIG_SMP
2252 {
2253 .procname = "oops_all_cpu_backtrace",
2254 .data = &sysctl_oops_all_cpu_backtrace,
2255 .maxlen = sizeof(int),
2256 .mode = 0644,
2257 .proc_handler = proc_dointvec_minmax,
2258 .extra1 = SYSCTL_ZERO,
2259 .extra2 = SYSCTL_ONE,
2260 },
2261 #endif /* CONFIG_SMP */
2262 {
2263 .procname = "pid_max",
2264 .data = &pid_max,
2265 .maxlen = sizeof (int),
2266 .mode = 0644,
2267 .proc_handler = proc_dointvec_minmax,
2268 .extra1 = &pid_max_min,
2269 .extra2 = &pid_max_max,
2270 },
2271 {
2272 .procname = "panic_on_oops",
2273 .data = &panic_on_oops,
2274 .maxlen = sizeof(int),
2275 .mode = 0644,
2276 .proc_handler = proc_dointvec,
2277 },
2278 {
2279 .procname = "panic_print",
2280 .data = &panic_print,
2281 .maxlen = sizeof(unsigned long),
2282 .mode = 0644,
2283 .proc_handler = proc_doulongvec_minmax,
2284 },
2285 #if defined CONFIG_PRINTK
2286 {
2287 .procname = "printk",
2288 .data = &console_loglevel,
2289 .maxlen = 4*sizeof(int),
2290 .mode = 0644,
2291 .proc_handler = proc_dointvec,
2292 },
2293 {
2294 .procname = "printk_ratelimit",
2295 .data = &printk_ratelimit_state.interval,
2296 .maxlen = sizeof(int),
2297 .mode = 0644,
2298 .proc_handler = proc_dointvec_jiffies,
2299 },
2300 {
2301 .procname = "printk_ratelimit_burst",
2302 .data = &printk_ratelimit_state.burst,
2303 .maxlen = sizeof(int),
2304 .mode = 0644,
2305 .proc_handler = proc_dointvec,
2306 },
2307 {
2308 .procname = "printk_delay",
2309 .data = &printk_delay_msec,
2310 .maxlen = sizeof(int),
2311 .mode = 0644,
2312 .proc_handler = proc_dointvec_minmax,
2313 .extra1 = SYSCTL_ZERO,
2314 .extra2 = &ten_thousand,
2315 },
2316 {
2317 .procname = "printk_devkmsg",
2318 .data = devkmsg_log_str,
2319 .maxlen = DEVKMSG_STR_MAX_SIZE,
2320 .mode = 0644,
2321 .proc_handler = devkmsg_sysctl_set_loglvl,
2322 },
2323 {
2324 .procname = "dmesg_restrict",
2325 .data = &dmesg_restrict,
2326 .maxlen = sizeof(int),
2327 .mode = 0644,
2328 .proc_handler = proc_dointvec_minmax_sysadmin,
2329 .extra1 = SYSCTL_ZERO,
2330 .extra2 = SYSCTL_ONE,
2331 },
2332 {
2333 .procname = "kptr_restrict",
2334 .data = &kptr_restrict,
2335 .maxlen = sizeof(int),
2336 .mode = 0644,
2337 .proc_handler = proc_dointvec_minmax_sysadmin,
2338 .extra1 = SYSCTL_ZERO,
2339 .extra2 = &two,
2340 },
2341 #endif
2342 {
2343 .procname = "ngroups_max",
2344 .data = &ngroups_max,
2345 .maxlen = sizeof (int),
2346 .mode = 0444,
2347 .proc_handler = proc_dointvec,
2348 },
2349 {
2350 .procname = "cap_last_cap",
2351 .data = (void *)&cap_last_cap,
2352 .maxlen = sizeof(int),
2353 .mode = 0444,
2354 .proc_handler = proc_dointvec,
2355 },
2356 #if defined(CONFIG_LOCKUP_DETECTOR)
2357 {
2358 .procname = "watchdog",
2359 .data = &watchdog_user_enabled,
2360 .maxlen = sizeof(int),
2361 .mode = 0644,
2362 .proc_handler = proc_watchdog,
2363 .extra1 = SYSCTL_ZERO,
2364 .extra2 = SYSCTL_ONE,
2365 },
2366 {
2367 .procname = "watchdog_thresh",
2368 .data = &watchdog_thresh,
2369 .maxlen = sizeof(int),
2370 .mode = 0644,
2371 .proc_handler = proc_watchdog_thresh,
2372 .extra1 = SYSCTL_ZERO,
2373 .extra2 = &sixty,
2374 },
2375 {
2376 .procname = "nmi_watchdog",
2377 .data = &nmi_watchdog_user_enabled,
2378 .maxlen = sizeof(int),
2379 .mode = NMI_WATCHDOG_SYSCTL_PERM,
2380 .proc_handler = proc_nmi_watchdog,
2381 .extra1 = SYSCTL_ZERO,
2382 .extra2 = SYSCTL_ONE,
2383 },
2384 {
2385 .procname = "watchdog_cpumask",
2386 .data = &watchdog_cpumask_bits,
2387 .maxlen = NR_CPUS,
2388 .mode = 0644,
2389 .proc_handler = proc_watchdog_cpumask,
2390 },
2391 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
2392 {
2393 .procname = "soft_watchdog",
2394 .data = &soft_watchdog_user_enabled,
2395 .maxlen = sizeof(int),
2396 .mode = 0644,
2397 .proc_handler = proc_soft_watchdog,
2398 .extra1 = SYSCTL_ZERO,
2399 .extra2 = SYSCTL_ONE,
2400 },
2401 {
2402 .procname = "softlockup_panic",
2403 .data = &softlockup_panic,
2404 .maxlen = sizeof(int),
2405 .mode = 0644,
2406 .proc_handler = proc_dointvec_minmax,
2407 .extra1 = SYSCTL_ZERO,
2408 .extra2 = SYSCTL_ONE,
2409 },
2410 #ifdef CONFIG_SMP
2411 {
2412 .procname = "softlockup_all_cpu_backtrace",
2413 .data = &sysctl_softlockup_all_cpu_backtrace,
2414 .maxlen = sizeof(int),
2415 .mode = 0644,
2416 .proc_handler = proc_dointvec_minmax,
2417 .extra1 = SYSCTL_ZERO,
2418 .extra2 = SYSCTL_ONE,
2419 },
2420 #endif /* CONFIG_SMP */
2421 #endif
2422 #ifdef CONFIG_HARDLOCKUP_DETECTOR
2423 {
2424 .procname = "hardlockup_panic",
2425 .data = &hardlockup_panic,
2426 .maxlen = sizeof(int),
2427 .mode = 0644,
2428 .proc_handler = proc_dointvec_minmax,
2429 .extra1 = SYSCTL_ZERO,
2430 .extra2 = SYSCTL_ONE,
2431 },
2432 #ifdef CONFIG_SMP
2433 {
2434 .procname = "hardlockup_all_cpu_backtrace",
2435 .data = &sysctl_hardlockup_all_cpu_backtrace,
2436 .maxlen = sizeof(int),
2437 .mode = 0644,
2438 .proc_handler = proc_dointvec_minmax,
2439 .extra1 = SYSCTL_ZERO,
2440 .extra2 = SYSCTL_ONE,
2441 },
2442 #endif /* CONFIG_SMP */
2443 #endif
2444 #endif
2445
2446 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2447 {
2448 .procname = "unknown_nmi_panic",
2449 .data = &unknown_nmi_panic,
2450 .maxlen = sizeof (int),
2451 .mode = 0644,
2452 .proc_handler = proc_dointvec,
2453 },
2454 #endif
2455
2456 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2457 defined(CONFIG_DEBUG_STACKOVERFLOW)
2458 {
2459 .procname = "panic_on_stackoverflow",
2460 .data = &sysctl_panic_on_stackoverflow,
2461 .maxlen = sizeof(int),
2462 .mode = 0644,
2463 .proc_handler = proc_dointvec,
2464 },
2465 #endif
2466 #if defined(CONFIG_X86)
2467 {
2468 .procname = "panic_on_unrecovered_nmi",
2469 .data = &panic_on_unrecovered_nmi,
2470 .maxlen = sizeof(int),
2471 .mode = 0644,
2472 .proc_handler = proc_dointvec,
2473 },
2474 {
2475 .procname = "panic_on_io_nmi",
2476 .data = &panic_on_io_nmi,
2477 .maxlen = sizeof(int),
2478 .mode = 0644,
2479 .proc_handler = proc_dointvec,
2480 },
2481 {
2482 .procname = "bootloader_type",
2483 .data = &bootloader_type,
2484 .maxlen = sizeof (int),
2485 .mode = 0444,
2486 .proc_handler = proc_dointvec,
2487 },
2488 {
2489 .procname = "bootloader_version",
2490 .data = &bootloader_version,
2491 .maxlen = sizeof (int),
2492 .mode = 0444,
2493 .proc_handler = proc_dointvec,
2494 },
2495 {
2496 .procname = "io_delay_type",
2497 .data = &io_delay_type,
2498 .maxlen = sizeof(int),
2499 .mode = 0644,
2500 .proc_handler = proc_dointvec,
2501 },
2502 #endif
2503 #if defined(CONFIG_MMU)
2504 {
2505 .procname = "randomize_va_space",
2506 .data = &randomize_va_space,
2507 .maxlen = sizeof(int),
2508 .mode = 0644,
2509 .proc_handler = proc_dointvec,
2510 },
2511 #endif
2512 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2513 {
2514 .procname = "spin_retry",
2515 .data = &spin_retry,
2516 .maxlen = sizeof (int),
2517 .mode = 0644,
2518 .proc_handler = proc_dointvec,
2519 },
2520 #endif
2521 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2522 {
2523 .procname = "acpi_video_flags",
2524 .data = &acpi_realmode_flags,
2525 .maxlen = sizeof (unsigned long),
2526 .mode = 0644,
2527 .proc_handler = proc_doulongvec_minmax,
2528 },
2529 #endif
2530 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2531 {
2532 .procname = "ignore-unaligned-usertrap",
2533 .data = &no_unaligned_warning,
2534 .maxlen = sizeof (int),
2535 .mode = 0644,
2536 .proc_handler = proc_dointvec,
2537 },
2538 #endif
2539 #ifdef CONFIG_IA64
2540 {
2541 .procname = "unaligned-dump-stack",
2542 .data = &unaligned_dump_stack,
2543 .maxlen = sizeof (int),
2544 .mode = 0644,
2545 .proc_handler = proc_dointvec,
2546 },
2547 #endif
2548 #ifdef CONFIG_DETECT_HUNG_TASK
2549 #ifdef CONFIG_SMP
2550 {
2551 .procname = "hung_task_all_cpu_backtrace",
2552 .data = &sysctl_hung_task_all_cpu_backtrace,
2553 .maxlen = sizeof(int),
2554 .mode = 0644,
2555 .proc_handler = proc_dointvec_minmax,
2556 .extra1 = SYSCTL_ZERO,
2557 .extra2 = SYSCTL_ONE,
2558 },
2559 #endif /* CONFIG_SMP */
2560 {
2561 .procname = "hung_task_panic",
2562 .data = &sysctl_hung_task_panic,
2563 .maxlen = sizeof(int),
2564 .mode = 0644,
2565 .proc_handler = proc_dointvec_minmax,
2566 .extra1 = SYSCTL_ZERO,
2567 .extra2 = SYSCTL_ONE,
2568 },
2569 {
2570 .procname = "hung_task_check_count",
2571 .data = &sysctl_hung_task_check_count,
2572 .maxlen = sizeof(int),
2573 .mode = 0644,
2574 .proc_handler = proc_dointvec_minmax,
2575 .extra1 = SYSCTL_ZERO,
2576 },
2577 {
2578 .procname = "hung_task_timeout_secs",
2579 .data = &sysctl_hung_task_timeout_secs,
2580 .maxlen = sizeof(unsigned long),
2581 .mode = 0644,
2582 .proc_handler = proc_dohung_task_timeout_secs,
2583 .extra2 = &hung_task_timeout_max,
2584 },
2585 {
2586 .procname = "hung_task_check_interval_secs",
2587 .data = &sysctl_hung_task_check_interval_secs,
2588 .maxlen = sizeof(unsigned long),
2589 .mode = 0644,
2590 .proc_handler = proc_dohung_task_timeout_secs,
2591 .extra2 = &hung_task_timeout_max,
2592 },
2593 {
2594 .procname = "hung_task_warnings",
2595 .data = &sysctl_hung_task_warnings,
2596 .maxlen = sizeof(int),
2597 .mode = 0644,
2598 .proc_handler = proc_dointvec_minmax,
2599 .extra1 = &neg_one,
2600 },
2601 #endif
2602 #ifdef CONFIG_RT_MUTEXES
2603 {
2604 .procname = "max_lock_depth",
2605 .data = &max_lock_depth,
2606 .maxlen = sizeof(int),
2607 .mode = 0644,
2608 .proc_handler = proc_dointvec,
2609 },
2610 #endif
2611 {
2612 .procname = "poweroff_cmd",
2613 .data = &poweroff_cmd,
2614 .maxlen = POWEROFF_CMD_PATH_LEN,
2615 .mode = 0644,
2616 .proc_handler = proc_dostring,
2617 },
2618 #ifdef CONFIG_KEYS
2619 {
2620 .procname = "keys",
2621 .mode = 0555,
2622 .child = key_sysctls,
2623 },
2624 #endif
2625 #ifdef CONFIG_PERF_EVENTS
2626 /*
2627 * User-space scripts rely on the existence of this file
2628 * as a feature check for perf_events being enabled.
2629 *
2630 * So it's an ABI, do not remove!
2631 */
2632 {
2633 .procname = "perf_event_paranoid",
2634 .data = &sysctl_perf_event_paranoid,
2635 .maxlen = sizeof(sysctl_perf_event_paranoid),
2636 .mode = 0644,
2637 .proc_handler = proc_dointvec,
2638 },
2639 {
2640 .procname = "perf_event_mlock_kb",
2641 .data = &sysctl_perf_event_mlock,
2642 .maxlen = sizeof(sysctl_perf_event_mlock),
2643 .mode = 0644,
2644 .proc_handler = proc_dointvec,
2645 },
2646 {
2647 .procname = "perf_event_max_sample_rate",
2648 .data = &sysctl_perf_event_sample_rate,
2649 .maxlen = sizeof(sysctl_perf_event_sample_rate),
2650 .mode = 0644,
2651 .proc_handler = perf_proc_update_handler,
2652 .extra1 = SYSCTL_ONE,
2653 },
2654 {
2655 .procname = "perf_cpu_time_max_percent",
2656 .data = &sysctl_perf_cpu_time_max_percent,
2657 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
2658 .mode = 0644,
2659 .proc_handler = perf_cpu_time_max_percent_handler,
2660 .extra1 = SYSCTL_ZERO,
2661 .extra2 = &one_hundred,
2662 },
2663 {
2664 .procname = "perf_event_max_stack",
2665 .data = &sysctl_perf_event_max_stack,
2666 .maxlen = sizeof(sysctl_perf_event_max_stack),
2667 .mode = 0644,
2668 .proc_handler = perf_event_max_stack_handler,
2669 .extra1 = SYSCTL_ZERO,
2670 .extra2 = &six_hundred_forty_kb,
2671 },
2672 {
2673 .procname = "perf_event_max_contexts_per_stack",
2674 .data = &sysctl_perf_event_max_contexts_per_stack,
2675 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
2676 .mode = 0644,
2677 .proc_handler = perf_event_max_stack_handler,
2678 .extra1 = SYSCTL_ZERO,
2679 .extra2 = &one_thousand,
2680 },
2681 #endif
2682 {
2683 .procname = "panic_on_warn",
2684 .data = &panic_on_warn,
2685 .maxlen = sizeof(int),
2686 .mode = 0644,
2687 .proc_handler = proc_dointvec_minmax,
2688 .extra1 = SYSCTL_ZERO,
2689 .extra2 = SYSCTL_ONE,
2690 },
2691 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2692 {
2693 .procname = "timer_migration",
2694 .data = &sysctl_timer_migration,
2695 .maxlen = sizeof(unsigned int),
2696 .mode = 0644,
2697 .proc_handler = timer_migration_handler,
2698 .extra1 = SYSCTL_ZERO,
2699 .extra2 = SYSCTL_ONE,
2700 },
2701 #endif
2702 #ifdef CONFIG_BPF_SYSCALL
2703 {
2704 .procname = "unprivileged_bpf_disabled",
2705 .data = &sysctl_unprivileged_bpf_disabled,
2706 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
2707 .mode = 0644,
2708 .proc_handler = bpf_unpriv_handler,
2709 .extra1 = SYSCTL_ZERO,
2710 .extra2 = &two,
2711 },
2712 {
2713 .procname = "bpf_stats_enabled",
2714 .data = &bpf_stats_enabled_key.key,
2715 .maxlen = sizeof(bpf_stats_enabled_key),
2716 .mode = 0644,
2717 .proc_handler = bpf_stats_handler,
2718 },
2719 #endif
2720 #if defined(CONFIG_TREE_RCU)
2721 {
2722 .procname = "panic_on_rcu_stall",
2723 .data = &sysctl_panic_on_rcu_stall,
2724 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
2725 .mode = 0644,
2726 .proc_handler = proc_dointvec_minmax,
2727 .extra1 = SYSCTL_ZERO,
2728 .extra2 = SYSCTL_ONE,
2729 },
2730 #endif
2731 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
2732 {
2733 .procname = "stack_erasing",
2734 .data = NULL,
2735 .maxlen = sizeof(int),
2736 .mode = 0600,
2737 .proc_handler = stack_erasing_sysctl,
2738 .extra1 = SYSCTL_ZERO,
2739 .extra2 = SYSCTL_ONE,
2740 },
2741 #endif
2742 { }
2743 };
2744
2745 static struct ctl_table vm_table[] = {
2746 {
2747 .procname = "overcommit_memory",
2748 .data = &sysctl_overcommit_memory,
2749 .maxlen = sizeof(sysctl_overcommit_memory),
2750 .mode = 0644,
2751 .proc_handler = overcommit_policy_handler,
2752 .extra1 = SYSCTL_ZERO,
2753 .extra2 = &two,
2754 },
2755 {
2756 .procname = "panic_on_oom",
2757 .data = &sysctl_panic_on_oom,
2758 .maxlen = sizeof(sysctl_panic_on_oom),
2759 .mode = 0644,
2760 .proc_handler = proc_dointvec_minmax,
2761 .extra1 = SYSCTL_ZERO,
2762 .extra2 = &two,
2763 },
2764 {
2765 .procname = "oom_kill_allocating_task",
2766 .data = &sysctl_oom_kill_allocating_task,
2767 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
2768 .mode = 0644,
2769 .proc_handler = proc_dointvec,
2770 },
2771 {
2772 .procname = "oom_dump_tasks",
2773 .data = &sysctl_oom_dump_tasks,
2774 .maxlen = sizeof(sysctl_oom_dump_tasks),
2775 .mode = 0644,
2776 .proc_handler = proc_dointvec,
2777 },
2778 {
2779 .procname = "overcommit_ratio",
2780 .data = &sysctl_overcommit_ratio,
2781 .maxlen = sizeof(sysctl_overcommit_ratio),
2782 .mode = 0644,
2783 .proc_handler = overcommit_ratio_handler,
2784 },
2785 {
2786 .procname = "overcommit_kbytes",
2787 .data = &sysctl_overcommit_kbytes,
2788 .maxlen = sizeof(sysctl_overcommit_kbytes),
2789 .mode = 0644,
2790 .proc_handler = overcommit_kbytes_handler,
2791 },
2792 {
2793 .procname = "page-cluster",
2794 .data = &page_cluster,
2795 .maxlen = sizeof(int),
2796 .mode = 0644,
2797 .proc_handler = proc_dointvec_minmax,
2798 .extra1 = SYSCTL_ZERO,
2799 },
2800 {
2801 .procname = "dirty_background_ratio",
2802 .data = &dirty_background_ratio,
2803 .maxlen = sizeof(dirty_background_ratio),
2804 .mode = 0644,
2805 .proc_handler = dirty_background_ratio_handler,
2806 .extra1 = SYSCTL_ZERO,
2807 .extra2 = &one_hundred,
2808 },
2809 {
2810 .procname = "dirty_background_bytes",
2811 .data = &dirty_background_bytes,
2812 .maxlen = sizeof(dirty_background_bytes),
2813 .mode = 0644,
2814 .proc_handler = dirty_background_bytes_handler,
2815 .extra1 = &one_ul,
2816 },
2817 {
2818 .procname = "dirty_ratio",
2819 .data = &vm_dirty_ratio,
2820 .maxlen = sizeof(vm_dirty_ratio),
2821 .mode = 0644,
2822 .proc_handler = dirty_ratio_handler,
2823 .extra1 = SYSCTL_ZERO,
2824 .extra2 = &one_hundred,
2825 },
2826 {
2827 .procname = "dirty_bytes",
2828 .data = &vm_dirty_bytes,
2829 .maxlen = sizeof(vm_dirty_bytes),
2830 .mode = 0644,
2831 .proc_handler = dirty_bytes_handler,
2832 .extra1 = &dirty_bytes_min,
2833 },
2834 {
2835 .procname = "dirty_writeback_centisecs",
2836 .data = &dirty_writeback_interval,
2837 .maxlen = sizeof(dirty_writeback_interval),
2838 .mode = 0644,
2839 .proc_handler = dirty_writeback_centisecs_handler,
2840 },
2841 {
2842 .procname = "dirty_expire_centisecs",
2843 .data = &dirty_expire_interval,
2844 .maxlen = sizeof(dirty_expire_interval),
2845 .mode = 0644,
2846 .proc_handler = proc_dointvec_minmax,
2847 .extra1 = SYSCTL_ZERO,
2848 },
2849 {
2850 .procname = "dirtytime_expire_seconds",
2851 .data = &dirtytime_expire_interval,
2852 .maxlen = sizeof(dirtytime_expire_interval),
2853 .mode = 0644,
2854 .proc_handler = dirtytime_interval_handler,
2855 .extra1 = SYSCTL_ZERO,
2856 },
2857 {
2858 .procname = "swappiness",
2859 .data = &vm_swappiness,
2860 .maxlen = sizeof(vm_swappiness),
2861 .mode = 0644,
2862 .proc_handler = proc_dointvec_minmax,
2863 .extra1 = SYSCTL_ZERO,
2864 .extra2 = &two_hundred,
2865 },
2866 #ifdef CONFIG_HUGETLB_PAGE
2867 {
2868 .procname = "nr_hugepages",
2869 .data = NULL,
2870 .maxlen = sizeof(unsigned long),
2871 .mode = 0644,
2872 .proc_handler = hugetlb_sysctl_handler,
2873 },
2874 #ifdef CONFIG_NUMA
2875 {
2876 .procname = "nr_hugepages_mempolicy",
2877 .data = NULL,
2878 .maxlen = sizeof(unsigned long),
2879 .mode = 0644,
2880 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
2881 },
2882 {
2883 .procname = "numa_stat",
2884 .data = &sysctl_vm_numa_stat,
2885 .maxlen = sizeof(int),
2886 .mode = 0644,
2887 .proc_handler = sysctl_vm_numa_stat_handler,
2888 .extra1 = SYSCTL_ZERO,
2889 .extra2 = SYSCTL_ONE,
2890 },
2891 #endif
2892 {
2893 .procname = "hugetlb_shm_group",
2894 .data = &sysctl_hugetlb_shm_group,
2895 .maxlen = sizeof(gid_t),
2896 .mode = 0644,
2897 .proc_handler = proc_dointvec,
2898 },
2899 {
2900 .procname = "nr_overcommit_hugepages",
2901 .data = NULL,
2902 .maxlen = sizeof(unsigned long),
2903 .mode = 0644,
2904 .proc_handler = hugetlb_overcommit_handler,
2905 },
2906 #endif
2907 {
2908 .procname = "lowmem_reserve_ratio",
2909 .data = &sysctl_lowmem_reserve_ratio,
2910 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
2911 .mode = 0644,
2912 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
2913 },
2914 {
2915 .procname = "drop_caches",
2916 .data = &sysctl_drop_caches,
2917 .maxlen = sizeof(int),
2918 .mode = 0200,
2919 .proc_handler = drop_caches_sysctl_handler,
2920 .extra1 = SYSCTL_ONE,
2921 .extra2 = &four,
2922 },
2923 #ifdef CONFIG_COMPACTION
2924 {
2925 .procname = "compact_memory",
2926 .data = &sysctl_compact_memory,
2927 .maxlen = sizeof(int),
2928 .mode = 0200,
2929 .proc_handler = sysctl_compaction_handler,
2930 },
2931 {
2932 .procname = "compaction_proactiveness",
2933 .data = &sysctl_compaction_proactiveness,
2934 .maxlen = sizeof(sysctl_compaction_proactiveness),
2935 .mode = 0644,
2936 .proc_handler = proc_dointvec_minmax,
2937 .extra1 = SYSCTL_ZERO,
2938 .extra2 = &one_hundred,
2939 },
2940 {
2941 .procname = "extfrag_threshold",
2942 .data = &sysctl_extfrag_threshold,
2943 .maxlen = sizeof(int),
2944 .mode = 0644,
2945 .proc_handler = proc_dointvec_minmax,
2946 .extra1 = &min_extfrag_threshold,
2947 .extra2 = &max_extfrag_threshold,
2948 },
2949 {
2950 .procname = "compact_unevictable_allowed",
2951 .data = &sysctl_compact_unevictable_allowed,
2952 .maxlen = sizeof(int),
2953 .mode = 0644,
2954 .proc_handler = proc_dointvec_minmax_warn_RT_change,
2955 .extra1 = SYSCTL_ZERO,
2956 .extra2 = SYSCTL_ONE,
2957 },
2958
2959 #endif /* CONFIG_COMPACTION */
2960 {
2961 .procname = "min_free_kbytes",
2962 .data = &min_free_kbytes,
2963 .maxlen = sizeof(min_free_kbytes),
2964 .mode = 0644,
2965 .proc_handler = min_free_kbytes_sysctl_handler,
2966 .extra1 = SYSCTL_ZERO,
2967 },
2968 {
2969 .procname = "watermark_boost_factor",
2970 .data = &watermark_boost_factor,
2971 .maxlen = sizeof(watermark_boost_factor),
2972 .mode = 0644,
2973 .proc_handler = proc_dointvec_minmax,
2974 .extra1 = SYSCTL_ZERO,
2975 },
2976 {
2977 .procname = "watermark_scale_factor",
2978 .data = &watermark_scale_factor,
2979 .maxlen = sizeof(watermark_scale_factor),
2980 .mode = 0644,
2981 .proc_handler = watermark_scale_factor_sysctl_handler,
2982 .extra1 = SYSCTL_ONE,
2983 .extra2 = &one_thousand,
2984 },
2985 {
2986 .procname = "percpu_pagelist_fraction",
2987 .data = &percpu_pagelist_fraction,
2988 .maxlen = sizeof(percpu_pagelist_fraction),
2989 .mode = 0644,
2990 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
2991 .extra1 = SYSCTL_ZERO,
2992 },
2993 {
2994 .procname = "page_lock_unfairness",
2995 .data = &sysctl_page_lock_unfairness,
2996 .maxlen = sizeof(sysctl_page_lock_unfairness),
2997 .mode = 0644,
2998 .proc_handler = proc_dointvec_minmax,
2999 .extra1 = SYSCTL_ZERO,
3000 },
3001 #ifdef CONFIG_MMU
3002 {
3003 .procname = "max_map_count",
3004 .data = &sysctl_max_map_count,
3005 .maxlen = sizeof(sysctl_max_map_count),
3006 .mode = 0644,
3007 .proc_handler = proc_dointvec_minmax,
3008 .extra1 = SYSCTL_ZERO,
3009 },
3010 #else
3011 {
3012 .procname = "nr_trim_pages",
3013 .data = &sysctl_nr_trim_pages,
3014 .maxlen = sizeof(sysctl_nr_trim_pages),
3015 .mode = 0644,
3016 .proc_handler = proc_dointvec_minmax,
3017 .extra1 = SYSCTL_ZERO,
3018 },
3019 #endif
3020 {
3021 .procname = "laptop_mode",
3022 .data = &laptop_mode,
3023 .maxlen = sizeof(laptop_mode),
3024 .mode = 0644,
3025 .proc_handler = proc_dointvec_jiffies,
3026 },
3027 {
3028 .procname = "vfs_cache_pressure",
3029 .data = &sysctl_vfs_cache_pressure,
3030 .maxlen = sizeof(sysctl_vfs_cache_pressure),
3031 .mode = 0644,
3032 .proc_handler = proc_dointvec_minmax,
3033 .extra1 = SYSCTL_ZERO,
3034 },
3035 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
3036 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
3037 {
3038 .procname = "legacy_va_layout",
3039 .data = &sysctl_legacy_va_layout,
3040 .maxlen = sizeof(sysctl_legacy_va_layout),
3041 .mode = 0644,
3042 .proc_handler = proc_dointvec_minmax,
3043 .extra1 = SYSCTL_ZERO,
3044 },
3045 #endif
3046 #ifdef CONFIG_NUMA
3047 {
3048 .procname = "zone_reclaim_mode",
3049 .data = &node_reclaim_mode,
3050 .maxlen = sizeof(node_reclaim_mode),
3051 .mode = 0644,
3052 .proc_handler = proc_dointvec_minmax,
3053 .extra1 = SYSCTL_ZERO,
3054 },
3055 {
3056 .procname = "min_unmapped_ratio",
3057 .data = &sysctl_min_unmapped_ratio,
3058 .maxlen = sizeof(sysctl_min_unmapped_ratio),
3059 .mode = 0644,
3060 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
3061 .extra1 = SYSCTL_ZERO,
3062 .extra2 = &one_hundred,
3063 },
3064 {
3065 .procname = "min_slab_ratio",
3066 .data = &sysctl_min_slab_ratio,
3067 .maxlen = sizeof(sysctl_min_slab_ratio),
3068 .mode = 0644,
3069 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
3070 .extra1 = SYSCTL_ZERO,
3071 .extra2 = &one_hundred,
3072 },
3073 #endif
3074 #ifdef CONFIG_SMP
3075 {
3076 .procname = "stat_interval",
3077 .data = &sysctl_stat_interval,
3078 .maxlen = sizeof(sysctl_stat_interval),
3079 .mode = 0644,
3080 .proc_handler = proc_dointvec_jiffies,
3081 },
3082 {
3083 .procname = "stat_refresh",
3084 .data = NULL,
3085 .maxlen = 0,
3086 .mode = 0600,
3087 .proc_handler = vmstat_refresh,
3088 },
3089 #endif
3090 #ifdef CONFIG_MMU
3091 {
3092 .procname = "mmap_min_addr",
3093 .data = &dac_mmap_min_addr,
3094 .maxlen = sizeof(unsigned long),
3095 .mode = 0644,
3096 .proc_handler = mmap_min_addr_handler,
3097 },
3098 #endif
3099 #ifdef CONFIG_NUMA
3100 {
3101 .procname = "numa_zonelist_order",
3102 .data = &numa_zonelist_order,
3103 .maxlen = NUMA_ZONELIST_ORDER_LEN,
3104 .mode = 0644,
3105 .proc_handler = numa_zonelist_order_handler,
3106 },
3107 #endif
3108 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
3109 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
3110 {
3111 .procname = "vdso_enabled",
3112 #ifdef CONFIG_X86_32
3113 .data = &vdso32_enabled,
3114 .maxlen = sizeof(vdso32_enabled),
3115 #else
3116 .data = &vdso_enabled,
3117 .maxlen = sizeof(vdso_enabled),
3118 #endif
3119 .mode = 0644,
3120 .proc_handler = proc_dointvec,
3121 .extra1 = SYSCTL_ZERO,
3122 },
3123 #endif
3124 #ifdef CONFIG_HIGHMEM
3125 {
3126 .procname = "highmem_is_dirtyable",
3127 .data = &vm_highmem_is_dirtyable,
3128 .maxlen = sizeof(vm_highmem_is_dirtyable),
3129 .mode = 0644,
3130 .proc_handler = proc_dointvec_minmax,
3131 .extra1 = SYSCTL_ZERO,
3132 .extra2 = SYSCTL_ONE,
3133 },
3134 #endif
3135 #ifdef CONFIG_MEMORY_FAILURE
3136 {
3137 .procname = "memory_failure_early_kill",
3138 .data = &sysctl_memory_failure_early_kill,
3139 .maxlen = sizeof(sysctl_memory_failure_early_kill),
3140 .mode = 0644,
3141 .proc_handler = proc_dointvec_minmax,
3142 .extra1 = SYSCTL_ZERO,
3143 .extra2 = SYSCTL_ONE,
3144 },
3145 {
3146 .procname = "memory_failure_recovery",
3147 .data = &sysctl_memory_failure_recovery,
3148 .maxlen = sizeof(sysctl_memory_failure_recovery),
3149 .mode = 0644,
3150 .proc_handler = proc_dointvec_minmax,
3151 .extra1 = SYSCTL_ZERO,
3152 .extra2 = SYSCTL_ONE,
3153 },
3154 #endif
3155 {
3156 .procname = "user_reserve_kbytes",
3157 .data = &sysctl_user_reserve_kbytes,
3158 .maxlen = sizeof(sysctl_user_reserve_kbytes),
3159 .mode = 0644,
3160 .proc_handler = proc_doulongvec_minmax,
3161 },
3162 {
3163 .procname = "admin_reserve_kbytes",
3164 .data = &sysctl_admin_reserve_kbytes,
3165 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
3166 .mode = 0644,
3167 .proc_handler = proc_doulongvec_minmax,
3168 },
3169 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
3170 {
3171 .procname = "mmap_rnd_bits",
3172 .data = &mmap_rnd_bits,
3173 .maxlen = sizeof(mmap_rnd_bits),
3174 .mode = 0600,
3175 .proc_handler = proc_dointvec_minmax,
3176 .extra1 = (void *)&mmap_rnd_bits_min,
3177 .extra2 = (void *)&mmap_rnd_bits_max,
3178 },
3179 #endif
3180 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
3181 {
3182 .procname = "mmap_rnd_compat_bits",
3183 .data = &mmap_rnd_compat_bits,
3184 .maxlen = sizeof(mmap_rnd_compat_bits),
3185 .mode = 0600,
3186 .proc_handler = proc_dointvec_minmax,
3187 .extra1 = (void *)&mmap_rnd_compat_bits_min,
3188 .extra2 = (void *)&mmap_rnd_compat_bits_max,
3189 },
3190 #endif
3191 #ifdef CONFIG_USERFAULTFD
3192 {
3193 .procname = "unprivileged_userfaultfd",
3194 .data = &sysctl_unprivileged_userfaultfd,
3195 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
3196 .mode = 0644,
3197 .proc_handler = proc_dointvec_minmax,
3198 .extra1 = SYSCTL_ZERO,
3199 .extra2 = SYSCTL_ONE,
3200 },
3201 #endif
3202 { }
3203 };
3204
3205 static struct ctl_table fs_table[] = {
3206 {
3207 .procname = "inode-nr",
3208 .data = &inodes_stat,
3209 .maxlen = 2*sizeof(long),
3210 .mode = 0444,
3211 .proc_handler = proc_nr_inodes,
3212 },
3213 {
3214 .procname = "inode-state",
3215 .data = &inodes_stat,
3216 .maxlen = 7*sizeof(long),
3217 .mode = 0444,
3218 .proc_handler = proc_nr_inodes,
3219 },
3220 {
3221 .procname = "file-nr",
3222 .data = &files_stat,
3223 .maxlen = sizeof(files_stat),
3224 .mode = 0444,
3225 .proc_handler = proc_nr_files,
3226 },
3227 {
3228 .procname = "file-max",
3229 .data = &files_stat.max_files,
3230 .maxlen = sizeof(files_stat.max_files),
3231 .mode = 0644,
3232 .proc_handler = proc_doulongvec_minmax,
3233 .extra1 = &zero_ul,
3234 .extra2 = &long_max,
3235 },
3236 {
3237 .procname = "nr_open",
3238 .data = &sysctl_nr_open,
3239 .maxlen = sizeof(unsigned int),
3240 .mode = 0644,
3241 .proc_handler = proc_dointvec_minmax,
3242 .extra1 = &sysctl_nr_open_min,
3243 .extra2 = &sysctl_nr_open_max,
3244 },
3245 {
3246 .procname = "dentry-state",
3247 .data = &dentry_stat,
3248 .maxlen = 6*sizeof(long),
3249 .mode = 0444,
3250 .proc_handler = proc_nr_dentry,
3251 },
3252 {
3253 .procname = "overflowuid",
3254 .data = &fs_overflowuid,
3255 .maxlen = sizeof(int),
3256 .mode = 0644,
3257 .proc_handler = proc_dointvec_minmax,
3258 .extra1 = &minolduid,
3259 .extra2 = &maxolduid,
3260 },
3261 {
3262 .procname = "overflowgid",
3263 .data = &fs_overflowgid,
3264 .maxlen = sizeof(int),
3265 .mode = 0644,
3266 .proc_handler = proc_dointvec_minmax,
3267 .extra1 = &minolduid,
3268 .extra2 = &maxolduid,
3269 },
3270 #ifdef CONFIG_FILE_LOCKING
3271 {
3272 .procname = "leases-enable",
3273 .data = &leases_enable,
3274 .maxlen = sizeof(int),
3275 .mode = 0644,
3276 .proc_handler = proc_dointvec,
3277 },
3278 #endif
3279 #ifdef CONFIG_DNOTIFY
3280 {
3281 .procname = "dir-notify-enable",
3282 .data = &dir_notify_enable,
3283 .maxlen = sizeof(int),
3284 .mode = 0644,
3285 .proc_handler = proc_dointvec,
3286 },
3287 #endif
3288 #ifdef CONFIG_MMU
3289 #ifdef CONFIG_FILE_LOCKING
3290 {
3291 .procname = "lease-break-time",
3292 .data = &lease_break_time,
3293 .maxlen = sizeof(int),
3294 .mode = 0644,
3295 .proc_handler = proc_dointvec,
3296 },
3297 #endif
3298 #ifdef CONFIG_AIO
3299 {
3300 .procname = "aio-nr",
3301 .data = &aio_nr,
3302 .maxlen = sizeof(aio_nr),
3303 .mode = 0444,
3304 .proc_handler = proc_doulongvec_minmax,
3305 },
3306 {
3307 .procname = "aio-max-nr",
3308 .data = &aio_max_nr,
3309 .maxlen = sizeof(aio_max_nr),
3310 .mode = 0644,
3311 .proc_handler = proc_doulongvec_minmax,
3312 },
3313 #endif /* CONFIG_AIO */
3314 #ifdef CONFIG_INOTIFY_USER
3315 {
3316 .procname = "inotify",
3317 .mode = 0555,
3318 .child = inotify_table,
3319 },
3320 #endif
3321 #ifdef CONFIG_EPOLL
3322 {
3323 .procname = "epoll",
3324 .mode = 0555,
3325 .child = epoll_table,
3326 },
3327 #endif
3328 #endif
3329 {
3330 .procname = "protected_symlinks",
3331 .data = &sysctl_protected_symlinks,
3332 .maxlen = sizeof(int),
3333 .mode = 0600,
3334 .proc_handler = proc_dointvec_minmax,
3335 .extra1 = SYSCTL_ZERO,
3336 .extra2 = SYSCTL_ONE,
3337 },
3338 {
3339 .procname = "protected_hardlinks",
3340 .data = &sysctl_protected_hardlinks,
3341 .maxlen = sizeof(int),
3342 .mode = 0600,
3343 .proc_handler = proc_dointvec_minmax,
3344 .extra1 = SYSCTL_ZERO,
3345 .extra2 = SYSCTL_ONE,
3346 },
3347 {
3348 .procname = "protected_fifos",
3349 .data = &sysctl_protected_fifos,
3350 .maxlen = sizeof(int),
3351 .mode = 0600,
3352 .proc_handler = proc_dointvec_minmax,
3353 .extra1 = SYSCTL_ZERO,
3354 .extra2 = &two,
3355 },
3356 {
3357 .procname = "protected_regular",
3358 .data = &sysctl_protected_regular,
3359 .maxlen = sizeof(int),
3360 .mode = 0600,
3361 .proc_handler = proc_dointvec_minmax,
3362 .extra1 = SYSCTL_ZERO,
3363 .extra2 = &two,
3364 },
3365 {
3366 .procname = "suid_dumpable",
3367 .data = &suid_dumpable,
3368 .maxlen = sizeof(int),
3369 .mode = 0644,
3370 .proc_handler = proc_dointvec_minmax_coredump,
3371 .extra1 = SYSCTL_ZERO,
3372 .extra2 = &two,
3373 },
3374 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
3375 {
3376 .procname = "binfmt_misc",
3377 .mode = 0555,
3378 .child = sysctl_mount_point,
3379 },
3380 #endif
3381 {
3382 .procname = "pipe-max-size",
3383 .data = &pipe_max_size,
3384 .maxlen = sizeof(pipe_max_size),
3385 .mode = 0644,
3386 .proc_handler = proc_dopipe_max_size,
3387 },
3388 {
3389 .procname = "pipe-user-pages-hard",
3390 .data = &pipe_user_pages_hard,
3391 .maxlen = sizeof(pipe_user_pages_hard),
3392 .mode = 0644,
3393 .proc_handler = proc_doulongvec_minmax,
3394 },
3395 {
3396 .procname = "pipe-user-pages-soft",
3397 .data = &pipe_user_pages_soft,
3398 .maxlen = sizeof(pipe_user_pages_soft),
3399 .mode = 0644,
3400 .proc_handler = proc_doulongvec_minmax,
3401 },
3402 {
3403 .procname = "mount-max",
3404 .data = &sysctl_mount_max,
3405 .maxlen = sizeof(unsigned int),
3406 .mode = 0644,
3407 .proc_handler = proc_dointvec_minmax,
3408 .extra1 = SYSCTL_ONE,
3409 },
3410 { }
3411 };
3412
3413 static struct ctl_table debug_table[] = {
3414 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
3415 {
3416 .procname = "exception-trace",
3417 .data = &show_unhandled_signals,
3418 .maxlen = sizeof(int),
3419 .mode = 0644,
3420 .proc_handler = proc_dointvec
3421 },
3422 #endif
3423 #if defined(CONFIG_OPTPROBES)
3424 {
3425 .procname = "kprobes-optimization",
3426 .data = &sysctl_kprobes_optimization,
3427 .maxlen = sizeof(int),
3428 .mode = 0644,
3429 .proc_handler = proc_kprobes_optimization_handler,
3430 .extra1 = SYSCTL_ZERO,
3431 .extra2 = SYSCTL_ONE,
3432 },
3433 #endif
3434 { }
3435 };
3436
3437 static struct ctl_table dev_table[] = {
3438 { }
3439 };
3440
3441 static struct ctl_table sysctl_base_table[] = {
3442 {
3443 .procname = "kernel",
3444 .mode = 0555,
3445 .child = kern_table,
3446 },
3447 {
3448 .procname = "vm",
3449 .mode = 0555,
3450 .child = vm_table,
3451 },
3452 {
3453 .procname = "fs",
3454 .mode = 0555,
3455 .child = fs_table,
3456 },
3457 {
3458 .procname = "debug",
3459 .mode = 0555,
3460 .child = debug_table,
3461 },
3462 {
3463 .procname = "dev",
3464 .mode = 0555,
3465 .child = dev_table,
3466 },
3467 { }
3468 };
3469
sysctl_init(void)3470 int __init sysctl_init(void)
3471 {
3472 struct ctl_table_header *hdr;
3473
3474 hdr = register_sysctl_table(sysctl_base_table);
3475 kmemleak_not_leak(hdr);
3476 return 0;
3477 }
3478 #endif /* CONFIG_SYSCTL */
3479 /*
3480 * No sense putting this after each symbol definition, twice,
3481 * exception granted :-)
3482 */
3483 EXPORT_SYMBOL(proc_dointvec);
3484 EXPORT_SYMBOL(proc_douintvec);
3485 EXPORT_SYMBOL(proc_dointvec_jiffies);
3486 EXPORT_SYMBOL(proc_dointvec_minmax);
3487 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3488 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3489 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3490 EXPORT_SYMBOL(proc_dostring);
3491 EXPORT_SYMBOL(proc_doulongvec_minmax);
3492 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3493 EXPORT_SYMBOL(proc_do_large_bitmap);
3494