1 /* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21 #include <linux/module.h> 22 #include <linux/aio.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/bitmap.h> 28 #include <linux/signal.h> 29 #include <linux/printk.h> 30 #include <linux/proc_fs.h> 31 #include <linux/security.h> 32 #include <linux/ctype.h> 33 #include <linux/kmemcheck.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/kexec.h> 67 #include <linux/bpf.h> 68 69 #include <asm/uaccess.h> 70 #include <asm/processor.h> 71 72 #ifdef CONFIG_X86 73 #include <asm/nmi.h> 74 #include <asm/stacktrace.h> 75 #include <asm/io.h> 76 #endif 77 #ifdef CONFIG_SPARC 78 #include <asm/setup.h> 79 #endif 80 #ifdef CONFIG_BSD_PROCESS_ACCT 81 #include <linux/acct.h> 82 #endif 83 #ifdef CONFIG_RT_MUTEXES 84 #include <linux/rtmutex.h> 85 #endif 86 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 87 #include <linux/lockdep.h> 88 #endif 89 #ifdef CONFIG_CHR_DEV_SG 90 #include <scsi/sg.h> 91 #endif 92 93 #ifdef CONFIG_LOCKUP_DETECTOR 94 #include <linux/nmi.h> 95 #endif 96 97 #if defined(CONFIG_SYSCTL) 98 99 /* External variables not in a header file. */ 100 extern int suid_dumpable; 101 #ifdef CONFIG_COREDUMP 102 extern int core_uses_pid; 103 extern char core_pattern[]; 104 extern unsigned int core_pipe_limit; 105 #endif 106 extern int pid_max; 107 extern int pid_max_min, pid_max_max; 108 extern int percpu_pagelist_fraction; 109 extern int compat_log; 110 extern int latencytop_enabled; 111 extern int sysctl_nr_open_min, sysctl_nr_open_max; 112 #ifndef CONFIG_MMU 113 extern int sysctl_nr_trim_pages; 114 #endif 115 116 /* Constants used for minimum and maximum */ 117 #ifdef CONFIG_LOCKUP_DETECTOR 118 static int sixty = 60; 119 #endif 120 121 static int __maybe_unused neg_one = -1; 122 123 static int zero; 124 static int __maybe_unused one = 1; 125 static int __maybe_unused two = 2; 126 static int __maybe_unused four = 4; 127 static unsigned long one_ul = 1; 128 static int one_hundred = 100; 129 static int one_thousand = 1000; 130 #ifdef CONFIG_PRINTK 131 static int ten_thousand = 10000; 132 #endif 133 #ifdef CONFIG_PERF_EVENTS 134 static int six_hundred_forty_kb = 640 * 1024; 135 #endif 136 137 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 138 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 139 140 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 141 static int maxolduid = 65535; 142 static int minolduid; 143 144 static int ngroups_max = NGROUPS_MAX; 145 static const int cap_last_cap = CAP_LAST_CAP; 146 147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 148 #ifdef CONFIG_DETECT_HUNG_TASK 149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 150 #endif 151 152 #ifdef CONFIG_INOTIFY_USER 153 #include <linux/inotify.h> 154 #endif 155 #ifdef CONFIG_SPARC 156 #endif 157 158 #ifdef __hppa__ 159 extern int pwrsw_enabled; 160 #endif 161 162 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 163 extern int unaligned_enabled; 164 #endif 165 166 #ifdef CONFIG_IA64 167 extern int unaligned_dump_stack; 168 #endif 169 170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 171 extern int no_unaligned_warning; 172 #endif 173 174 #ifdef CONFIG_PROC_SYSCTL 175 176 #define SYSCTL_WRITES_LEGACY -1 177 #define SYSCTL_WRITES_WARN 0 178 #define SYSCTL_WRITES_STRICT 1 179 180 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT; 181 182 static int proc_do_cad_pid(struct ctl_table *table, int write, 183 void __user *buffer, size_t *lenp, loff_t *ppos); 184 static int proc_taint(struct ctl_table *table, int write, 185 void __user *buffer, size_t *lenp, loff_t *ppos); 186 #endif 187 188 #ifdef CONFIG_PRINTK 189 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 190 void __user *buffer, size_t *lenp, loff_t *ppos); 191 #endif 192 193 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 194 void __user *buffer, size_t *lenp, loff_t *ppos); 195 #ifdef CONFIG_COREDUMP 196 static int proc_dostring_coredump(struct ctl_table *table, int write, 197 void __user *buffer, size_t *lenp, loff_t *ppos); 198 #endif 199 200 #ifdef CONFIG_MAGIC_SYSRQ 201 /* Note: sysrq code uses it's own private copy */ 202 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 203 204 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 205 void __user *buffer, size_t *lenp, 206 loff_t *ppos) 207 { 208 int error; 209 210 error = proc_dointvec(table, write, buffer, lenp, ppos); 211 if (error) 212 return error; 213 214 if (write) 215 sysrq_toggle_support(__sysrq_enabled); 216 217 return 0; 218 } 219 220 #endif 221 222 static struct ctl_table kern_table[]; 223 static struct ctl_table vm_table[]; 224 static struct ctl_table fs_table[]; 225 static struct ctl_table debug_table[]; 226 static struct ctl_table dev_table[]; 227 extern struct ctl_table random_table[]; 228 #ifdef CONFIG_EPOLL 229 extern struct ctl_table epoll_table[]; 230 #endif 231 232 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 233 int sysctl_legacy_va_layout; 234 #endif 235 236 /* The default sysctl tables: */ 237 238 static struct ctl_table sysctl_base_table[] = { 239 { 240 .procname = "kernel", 241 .mode = 0555, 242 .child = kern_table, 243 }, 244 { 245 .procname = "vm", 246 .mode = 0555, 247 .child = vm_table, 248 }, 249 { 250 .procname = "fs", 251 .mode = 0555, 252 .child = fs_table, 253 }, 254 { 255 .procname = "debug", 256 .mode = 0555, 257 .child = debug_table, 258 }, 259 { 260 .procname = "dev", 261 .mode = 0555, 262 .child = dev_table, 263 }, 264 { } 265 }; 266 267 #ifdef CONFIG_SCHED_DEBUG 268 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 269 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 270 static int min_wakeup_granularity_ns; /* 0 usecs */ 271 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 272 #ifdef CONFIG_SMP 273 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 274 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 275 #endif /* CONFIG_SMP */ 276 #endif /* CONFIG_SCHED_DEBUG */ 277 278 #ifdef CONFIG_COMPACTION 279 static int min_extfrag_threshold; 280 static int max_extfrag_threshold = 1000; 281 #endif 282 283 static struct ctl_table kern_table[] = { 284 { 285 .procname = "sched_child_runs_first", 286 .data = &sysctl_sched_child_runs_first, 287 .maxlen = sizeof(unsigned int), 288 .mode = 0644, 289 .proc_handler = proc_dointvec, 290 }, 291 #ifdef CONFIG_SCHED_DEBUG 292 { 293 .procname = "sched_min_granularity_ns", 294 .data = &sysctl_sched_min_granularity, 295 .maxlen = sizeof(unsigned int), 296 .mode = 0644, 297 .proc_handler = sched_proc_update_handler, 298 .extra1 = &min_sched_granularity_ns, 299 .extra2 = &max_sched_granularity_ns, 300 }, 301 { 302 .procname = "sched_latency_ns", 303 .data = &sysctl_sched_latency, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = sched_proc_update_handler, 307 .extra1 = &min_sched_granularity_ns, 308 .extra2 = &max_sched_granularity_ns, 309 }, 310 { 311 .procname = "sched_wakeup_granularity_ns", 312 .data = &sysctl_sched_wakeup_granularity, 313 .maxlen = sizeof(unsigned int), 314 .mode = 0644, 315 .proc_handler = sched_proc_update_handler, 316 .extra1 = &min_wakeup_granularity_ns, 317 .extra2 = &max_wakeup_granularity_ns, 318 }, 319 #ifdef CONFIG_SMP 320 { 321 .procname = "sched_tunable_scaling", 322 .data = &sysctl_sched_tunable_scaling, 323 .maxlen = sizeof(enum sched_tunable_scaling), 324 .mode = 0644, 325 .proc_handler = sched_proc_update_handler, 326 .extra1 = &min_sched_tunable_scaling, 327 .extra2 = &max_sched_tunable_scaling, 328 }, 329 { 330 .procname = "sched_migration_cost_ns", 331 .data = &sysctl_sched_migration_cost, 332 .maxlen = sizeof(unsigned int), 333 .mode = 0644, 334 .proc_handler = proc_dointvec, 335 }, 336 { 337 .procname = "sched_nr_migrate", 338 .data = &sysctl_sched_nr_migrate, 339 .maxlen = sizeof(unsigned int), 340 .mode = 0644, 341 .proc_handler = proc_dointvec, 342 }, 343 { 344 .procname = "sched_time_avg_ms", 345 .data = &sysctl_sched_time_avg, 346 .maxlen = sizeof(unsigned int), 347 .mode = 0644, 348 .proc_handler = proc_dointvec, 349 }, 350 { 351 .procname = "sched_shares_window_ns", 352 .data = &sysctl_sched_shares_window, 353 .maxlen = sizeof(unsigned int), 354 .mode = 0644, 355 .proc_handler = proc_dointvec, 356 }, 357 #ifdef CONFIG_SCHEDSTATS 358 { 359 .procname = "sched_schedstats", 360 .data = NULL, 361 .maxlen = sizeof(unsigned int), 362 .mode = 0644, 363 .proc_handler = sysctl_schedstats, 364 .extra1 = &zero, 365 .extra2 = &one, 366 }, 367 #endif /* CONFIG_SCHEDSTATS */ 368 #endif /* CONFIG_SMP */ 369 #ifdef CONFIG_NUMA_BALANCING 370 { 371 .procname = "numa_balancing_scan_delay_ms", 372 .data = &sysctl_numa_balancing_scan_delay, 373 .maxlen = sizeof(unsigned int), 374 .mode = 0644, 375 .proc_handler = proc_dointvec, 376 }, 377 { 378 .procname = "numa_balancing_scan_period_min_ms", 379 .data = &sysctl_numa_balancing_scan_period_min, 380 .maxlen = sizeof(unsigned int), 381 .mode = 0644, 382 .proc_handler = proc_dointvec, 383 }, 384 { 385 .procname = "numa_balancing_scan_period_max_ms", 386 .data = &sysctl_numa_balancing_scan_period_max, 387 .maxlen = sizeof(unsigned int), 388 .mode = 0644, 389 .proc_handler = proc_dointvec, 390 }, 391 { 392 .procname = "numa_balancing_scan_size_mb", 393 .data = &sysctl_numa_balancing_scan_size, 394 .maxlen = sizeof(unsigned int), 395 .mode = 0644, 396 .proc_handler = proc_dointvec_minmax, 397 .extra1 = &one, 398 }, 399 { 400 .procname = "numa_balancing", 401 .data = NULL, /* filled in by handler */ 402 .maxlen = sizeof(unsigned int), 403 .mode = 0644, 404 .proc_handler = sysctl_numa_balancing, 405 .extra1 = &zero, 406 .extra2 = &one, 407 }, 408 #endif /* CONFIG_NUMA_BALANCING */ 409 #endif /* CONFIG_SCHED_DEBUG */ 410 { 411 .procname = "sched_rt_period_us", 412 .data = &sysctl_sched_rt_period, 413 .maxlen = sizeof(unsigned int), 414 .mode = 0644, 415 .proc_handler = sched_rt_handler, 416 }, 417 { 418 .procname = "sched_rt_runtime_us", 419 .data = &sysctl_sched_rt_runtime, 420 .maxlen = sizeof(int), 421 .mode = 0644, 422 .proc_handler = sched_rt_handler, 423 }, 424 { 425 .procname = "sched_rr_timeslice_ms", 426 .data = &sched_rr_timeslice, 427 .maxlen = sizeof(int), 428 .mode = 0644, 429 .proc_handler = sched_rr_handler, 430 }, 431 #ifdef CONFIG_SCHED_AUTOGROUP 432 { 433 .procname = "sched_autogroup_enabled", 434 .data = &sysctl_sched_autogroup_enabled, 435 .maxlen = sizeof(unsigned int), 436 .mode = 0644, 437 .proc_handler = proc_dointvec_minmax, 438 .extra1 = &zero, 439 .extra2 = &one, 440 }, 441 #endif 442 #ifdef CONFIG_CFS_BANDWIDTH 443 { 444 .procname = "sched_cfs_bandwidth_slice_us", 445 .data = &sysctl_sched_cfs_bandwidth_slice, 446 .maxlen = sizeof(unsigned int), 447 .mode = 0644, 448 .proc_handler = proc_dointvec_minmax, 449 .extra1 = &one, 450 }, 451 #endif 452 #ifdef CONFIG_PROVE_LOCKING 453 { 454 .procname = "prove_locking", 455 .data = &prove_locking, 456 .maxlen = sizeof(int), 457 .mode = 0644, 458 .proc_handler = proc_dointvec, 459 }, 460 #endif 461 #ifdef CONFIG_LOCK_STAT 462 { 463 .procname = "lock_stat", 464 .data = &lock_stat, 465 .maxlen = sizeof(int), 466 .mode = 0644, 467 .proc_handler = proc_dointvec, 468 }, 469 #endif 470 { 471 .procname = "panic", 472 .data = &panic_timeout, 473 .maxlen = sizeof(int), 474 .mode = 0644, 475 .proc_handler = proc_dointvec, 476 }, 477 #ifdef CONFIG_COREDUMP 478 { 479 .procname = "core_uses_pid", 480 .data = &core_uses_pid, 481 .maxlen = sizeof(int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec, 484 }, 485 { 486 .procname = "core_pattern", 487 .data = core_pattern, 488 .maxlen = CORENAME_MAX_SIZE, 489 .mode = 0644, 490 .proc_handler = proc_dostring_coredump, 491 }, 492 { 493 .procname = "core_pipe_limit", 494 .data = &core_pipe_limit, 495 .maxlen = sizeof(unsigned int), 496 .mode = 0644, 497 .proc_handler = proc_dointvec, 498 }, 499 #endif 500 #ifdef CONFIG_PROC_SYSCTL 501 { 502 .procname = "tainted", 503 .maxlen = sizeof(long), 504 .mode = 0644, 505 .proc_handler = proc_taint, 506 }, 507 { 508 .procname = "sysctl_writes_strict", 509 .data = &sysctl_writes_strict, 510 .maxlen = sizeof(int), 511 .mode = 0644, 512 .proc_handler = proc_dointvec_minmax, 513 .extra1 = &neg_one, 514 .extra2 = &one, 515 }, 516 #endif 517 #ifdef CONFIG_LATENCYTOP 518 { 519 .procname = "latencytop", 520 .data = &latencytop_enabled, 521 .maxlen = sizeof(int), 522 .mode = 0644, 523 .proc_handler = sysctl_latencytop, 524 }, 525 #endif 526 #ifdef CONFIG_BLK_DEV_INITRD 527 { 528 .procname = "real-root-dev", 529 .data = &real_root_dev, 530 .maxlen = sizeof(int), 531 .mode = 0644, 532 .proc_handler = proc_dointvec, 533 }, 534 #endif 535 { 536 .procname = "print-fatal-signals", 537 .data = &print_fatal_signals, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec, 541 }, 542 #ifdef CONFIG_SPARC 543 { 544 .procname = "reboot-cmd", 545 .data = reboot_command, 546 .maxlen = 256, 547 .mode = 0644, 548 .proc_handler = proc_dostring, 549 }, 550 { 551 .procname = "stop-a", 552 .data = &stop_a_enabled, 553 .maxlen = sizeof (int), 554 .mode = 0644, 555 .proc_handler = proc_dointvec, 556 }, 557 { 558 .procname = "scons-poweroff", 559 .data = &scons_pwroff, 560 .maxlen = sizeof (int), 561 .mode = 0644, 562 .proc_handler = proc_dointvec, 563 }, 564 #endif 565 #ifdef CONFIG_SPARC64 566 { 567 .procname = "tsb-ratio", 568 .data = &sysctl_tsb_ratio, 569 .maxlen = sizeof (int), 570 .mode = 0644, 571 .proc_handler = proc_dointvec, 572 }, 573 #endif 574 #ifdef __hppa__ 575 { 576 .procname = "soft-power", 577 .data = &pwrsw_enabled, 578 .maxlen = sizeof (int), 579 .mode = 0644, 580 .proc_handler = proc_dointvec, 581 }, 582 #endif 583 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 584 { 585 .procname = "unaligned-trap", 586 .data = &unaligned_enabled, 587 .maxlen = sizeof (int), 588 .mode = 0644, 589 .proc_handler = proc_dointvec, 590 }, 591 #endif 592 { 593 .procname = "ctrl-alt-del", 594 .data = &C_A_D, 595 .maxlen = sizeof(int), 596 .mode = 0644, 597 .proc_handler = proc_dointvec, 598 }, 599 #ifdef CONFIG_FUNCTION_TRACER 600 { 601 .procname = "ftrace_enabled", 602 .data = &ftrace_enabled, 603 .maxlen = sizeof(int), 604 .mode = 0644, 605 .proc_handler = ftrace_enable_sysctl, 606 }, 607 #endif 608 #ifdef CONFIG_STACK_TRACER 609 { 610 .procname = "stack_tracer_enabled", 611 .data = &stack_tracer_enabled, 612 .maxlen = sizeof(int), 613 .mode = 0644, 614 .proc_handler = stack_trace_sysctl, 615 }, 616 #endif 617 #ifdef CONFIG_TRACING 618 { 619 .procname = "ftrace_dump_on_oops", 620 .data = &ftrace_dump_on_oops, 621 .maxlen = sizeof(int), 622 .mode = 0644, 623 .proc_handler = proc_dointvec, 624 }, 625 { 626 .procname = "traceoff_on_warning", 627 .data = &__disable_trace_on_warning, 628 .maxlen = sizeof(__disable_trace_on_warning), 629 .mode = 0644, 630 .proc_handler = proc_dointvec, 631 }, 632 { 633 .procname = "tracepoint_printk", 634 .data = &tracepoint_printk, 635 .maxlen = sizeof(tracepoint_printk), 636 .mode = 0644, 637 .proc_handler = proc_dointvec, 638 }, 639 #endif 640 #ifdef CONFIG_KEXEC_CORE 641 { 642 .procname = "kexec_load_disabled", 643 .data = &kexec_load_disabled, 644 .maxlen = sizeof(int), 645 .mode = 0644, 646 /* only handle a transition from default "0" to "1" */ 647 .proc_handler = proc_dointvec_minmax, 648 .extra1 = &one, 649 .extra2 = &one, 650 }, 651 #endif 652 #ifdef CONFIG_MODULES 653 { 654 .procname = "modprobe", 655 .data = &modprobe_path, 656 .maxlen = KMOD_PATH_LEN, 657 .mode = 0644, 658 .proc_handler = proc_dostring, 659 }, 660 { 661 .procname = "modules_disabled", 662 .data = &modules_disabled, 663 .maxlen = sizeof(int), 664 .mode = 0644, 665 /* only handle a transition from default "0" to "1" */ 666 .proc_handler = proc_dointvec_minmax, 667 .extra1 = &one, 668 .extra2 = &one, 669 }, 670 #endif 671 #ifdef CONFIG_UEVENT_HELPER 672 { 673 .procname = "hotplug", 674 .data = &uevent_helper, 675 .maxlen = UEVENT_HELPER_PATH_LEN, 676 .mode = 0644, 677 .proc_handler = proc_dostring, 678 }, 679 #endif 680 #ifdef CONFIG_CHR_DEV_SG 681 { 682 .procname = "sg-big-buff", 683 .data = &sg_big_buff, 684 .maxlen = sizeof (int), 685 .mode = 0444, 686 .proc_handler = proc_dointvec, 687 }, 688 #endif 689 #ifdef CONFIG_BSD_PROCESS_ACCT 690 { 691 .procname = "acct", 692 .data = &acct_parm, 693 .maxlen = 3*sizeof(int), 694 .mode = 0644, 695 .proc_handler = proc_dointvec, 696 }, 697 #endif 698 #ifdef CONFIG_MAGIC_SYSRQ 699 { 700 .procname = "sysrq", 701 .data = &__sysrq_enabled, 702 .maxlen = sizeof (int), 703 .mode = 0644, 704 .proc_handler = sysrq_sysctl_handler, 705 }, 706 #endif 707 #ifdef CONFIG_PROC_SYSCTL 708 { 709 .procname = "cad_pid", 710 .data = NULL, 711 .maxlen = sizeof (int), 712 .mode = 0600, 713 .proc_handler = proc_do_cad_pid, 714 }, 715 #endif 716 { 717 .procname = "threads-max", 718 .data = NULL, 719 .maxlen = sizeof(int), 720 .mode = 0644, 721 .proc_handler = sysctl_max_threads, 722 }, 723 { 724 .procname = "random", 725 .mode = 0555, 726 .child = random_table, 727 }, 728 { 729 .procname = "usermodehelper", 730 .mode = 0555, 731 .child = usermodehelper_table, 732 }, 733 { 734 .procname = "overflowuid", 735 .data = &overflowuid, 736 .maxlen = sizeof(int), 737 .mode = 0644, 738 .proc_handler = proc_dointvec_minmax, 739 .extra1 = &minolduid, 740 .extra2 = &maxolduid, 741 }, 742 { 743 .procname = "overflowgid", 744 .data = &overflowgid, 745 .maxlen = sizeof(int), 746 .mode = 0644, 747 .proc_handler = proc_dointvec_minmax, 748 .extra1 = &minolduid, 749 .extra2 = &maxolduid, 750 }, 751 #ifdef CONFIG_S390 752 #ifdef CONFIG_MATHEMU 753 { 754 .procname = "ieee_emulation_warnings", 755 .data = &sysctl_ieee_emulation_warnings, 756 .maxlen = sizeof(int), 757 .mode = 0644, 758 .proc_handler = proc_dointvec, 759 }, 760 #endif 761 { 762 .procname = "userprocess_debug", 763 .data = &show_unhandled_signals, 764 .maxlen = sizeof(int), 765 .mode = 0644, 766 .proc_handler = proc_dointvec, 767 }, 768 #endif 769 { 770 .procname = "pid_max", 771 .data = &pid_max, 772 .maxlen = sizeof (int), 773 .mode = 0644, 774 .proc_handler = proc_dointvec_minmax, 775 .extra1 = &pid_max_min, 776 .extra2 = &pid_max_max, 777 }, 778 { 779 .procname = "panic_on_oops", 780 .data = &panic_on_oops, 781 .maxlen = sizeof(int), 782 .mode = 0644, 783 .proc_handler = proc_dointvec, 784 }, 785 #if defined CONFIG_PRINTK 786 { 787 .procname = "printk", 788 .data = &console_loglevel, 789 .maxlen = 4*sizeof(int), 790 .mode = 0644, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "printk_ratelimit", 795 .data = &printk_ratelimit_state.interval, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec_jiffies, 799 }, 800 { 801 .procname = "printk_ratelimit_burst", 802 .data = &printk_ratelimit_state.burst, 803 .maxlen = sizeof(int), 804 .mode = 0644, 805 .proc_handler = proc_dointvec, 806 }, 807 { 808 .procname = "printk_delay", 809 .data = &printk_delay_msec, 810 .maxlen = sizeof(int), 811 .mode = 0644, 812 .proc_handler = proc_dointvec_minmax, 813 .extra1 = &zero, 814 .extra2 = &ten_thousand, 815 }, 816 { 817 .procname = "printk_devkmsg", 818 .data = devkmsg_log_str, 819 .maxlen = DEVKMSG_STR_MAX_SIZE, 820 .mode = 0644, 821 .proc_handler = devkmsg_sysctl_set_loglvl, 822 }, 823 { 824 .procname = "dmesg_restrict", 825 .data = &dmesg_restrict, 826 .maxlen = sizeof(int), 827 .mode = 0644, 828 .proc_handler = proc_dointvec_minmax_sysadmin, 829 .extra1 = &zero, 830 .extra2 = &one, 831 }, 832 { 833 .procname = "kptr_restrict", 834 .data = &kptr_restrict, 835 .maxlen = sizeof(int), 836 .mode = 0644, 837 .proc_handler = proc_dointvec_minmax_sysadmin, 838 .extra1 = &zero, 839 .extra2 = &two, 840 }, 841 #endif 842 { 843 .procname = "ngroups_max", 844 .data = &ngroups_max, 845 .maxlen = sizeof (int), 846 .mode = 0444, 847 .proc_handler = proc_dointvec, 848 }, 849 { 850 .procname = "cap_last_cap", 851 .data = (void *)&cap_last_cap, 852 .maxlen = sizeof(int), 853 .mode = 0444, 854 .proc_handler = proc_dointvec, 855 }, 856 #if defined(CONFIG_LOCKUP_DETECTOR) 857 { 858 .procname = "watchdog", 859 .data = &watchdog_user_enabled, 860 .maxlen = sizeof (int), 861 .mode = 0644, 862 .proc_handler = proc_watchdog, 863 .extra1 = &zero, 864 .extra2 = &one, 865 }, 866 { 867 .procname = "watchdog_thresh", 868 .data = &watchdog_thresh, 869 .maxlen = sizeof(int), 870 .mode = 0644, 871 .proc_handler = proc_watchdog_thresh, 872 .extra1 = &zero, 873 .extra2 = &sixty, 874 }, 875 { 876 .procname = "nmi_watchdog", 877 .data = &nmi_watchdog_enabled, 878 .maxlen = sizeof (int), 879 .mode = 0644, 880 .proc_handler = proc_nmi_watchdog, 881 .extra1 = &zero, 882 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) 883 .extra2 = &one, 884 #else 885 .extra2 = &zero, 886 #endif 887 }, 888 { 889 .procname = "soft_watchdog", 890 .data = &soft_watchdog_enabled, 891 .maxlen = sizeof (int), 892 .mode = 0644, 893 .proc_handler = proc_soft_watchdog, 894 .extra1 = &zero, 895 .extra2 = &one, 896 }, 897 { 898 .procname = "watchdog_cpumask", 899 .data = &watchdog_cpumask_bits, 900 .maxlen = NR_CPUS, 901 .mode = 0644, 902 .proc_handler = proc_watchdog_cpumask, 903 }, 904 { 905 .procname = "softlockup_panic", 906 .data = &softlockup_panic, 907 .maxlen = sizeof(int), 908 .mode = 0644, 909 .proc_handler = proc_dointvec_minmax, 910 .extra1 = &zero, 911 .extra2 = &one, 912 }, 913 #ifdef CONFIG_HARDLOCKUP_DETECTOR 914 { 915 .procname = "hardlockup_panic", 916 .data = &hardlockup_panic, 917 .maxlen = sizeof(int), 918 .mode = 0644, 919 .proc_handler = proc_dointvec_minmax, 920 .extra1 = &zero, 921 .extra2 = &one, 922 }, 923 #endif 924 #ifdef CONFIG_SMP 925 { 926 .procname = "softlockup_all_cpu_backtrace", 927 .data = &sysctl_softlockup_all_cpu_backtrace, 928 .maxlen = sizeof(int), 929 .mode = 0644, 930 .proc_handler = proc_dointvec_minmax, 931 .extra1 = &zero, 932 .extra2 = &one, 933 }, 934 { 935 .procname = "hardlockup_all_cpu_backtrace", 936 .data = &sysctl_hardlockup_all_cpu_backtrace, 937 .maxlen = sizeof(int), 938 .mode = 0644, 939 .proc_handler = proc_dointvec_minmax, 940 .extra1 = &zero, 941 .extra2 = &one, 942 }, 943 #endif /* CONFIG_SMP */ 944 #endif 945 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 946 { 947 .procname = "unknown_nmi_panic", 948 .data = &unknown_nmi_panic, 949 .maxlen = sizeof (int), 950 .mode = 0644, 951 .proc_handler = proc_dointvec, 952 }, 953 #endif 954 #if defined(CONFIG_X86) 955 { 956 .procname = "panic_on_unrecovered_nmi", 957 .data = &panic_on_unrecovered_nmi, 958 .maxlen = sizeof(int), 959 .mode = 0644, 960 .proc_handler = proc_dointvec, 961 }, 962 { 963 .procname = "panic_on_io_nmi", 964 .data = &panic_on_io_nmi, 965 .maxlen = sizeof(int), 966 .mode = 0644, 967 .proc_handler = proc_dointvec, 968 }, 969 #ifdef CONFIG_DEBUG_STACKOVERFLOW 970 { 971 .procname = "panic_on_stackoverflow", 972 .data = &sysctl_panic_on_stackoverflow, 973 .maxlen = sizeof(int), 974 .mode = 0644, 975 .proc_handler = proc_dointvec, 976 }, 977 #endif 978 { 979 .procname = "bootloader_type", 980 .data = &bootloader_type, 981 .maxlen = sizeof (int), 982 .mode = 0444, 983 .proc_handler = proc_dointvec, 984 }, 985 { 986 .procname = "bootloader_version", 987 .data = &bootloader_version, 988 .maxlen = sizeof (int), 989 .mode = 0444, 990 .proc_handler = proc_dointvec, 991 }, 992 { 993 .procname = "kstack_depth_to_print", 994 .data = &kstack_depth_to_print, 995 .maxlen = sizeof(int), 996 .mode = 0644, 997 .proc_handler = proc_dointvec, 998 }, 999 { 1000 .procname = "io_delay_type", 1001 .data = &io_delay_type, 1002 .maxlen = sizeof(int), 1003 .mode = 0644, 1004 .proc_handler = proc_dointvec, 1005 }, 1006 #endif 1007 #if defined(CONFIG_MMU) 1008 { 1009 .procname = "randomize_va_space", 1010 .data = &randomize_va_space, 1011 .maxlen = sizeof(int), 1012 .mode = 0644, 1013 .proc_handler = proc_dointvec, 1014 }, 1015 #endif 1016 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1017 { 1018 .procname = "spin_retry", 1019 .data = &spin_retry, 1020 .maxlen = sizeof (int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec, 1023 }, 1024 #endif 1025 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1026 { 1027 .procname = "acpi_video_flags", 1028 .data = &acpi_realmode_flags, 1029 .maxlen = sizeof (unsigned long), 1030 .mode = 0644, 1031 .proc_handler = proc_doulongvec_minmax, 1032 }, 1033 #endif 1034 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1035 { 1036 .procname = "ignore-unaligned-usertrap", 1037 .data = &no_unaligned_warning, 1038 .maxlen = sizeof (int), 1039 .mode = 0644, 1040 .proc_handler = proc_dointvec, 1041 }, 1042 #endif 1043 #ifdef CONFIG_IA64 1044 { 1045 .procname = "unaligned-dump-stack", 1046 .data = &unaligned_dump_stack, 1047 .maxlen = sizeof (int), 1048 .mode = 0644, 1049 .proc_handler = proc_dointvec, 1050 }, 1051 #endif 1052 #ifdef CONFIG_DETECT_HUNG_TASK 1053 { 1054 .procname = "hung_task_panic", 1055 .data = &sysctl_hung_task_panic, 1056 .maxlen = sizeof(int), 1057 .mode = 0644, 1058 .proc_handler = proc_dointvec_minmax, 1059 .extra1 = &zero, 1060 .extra2 = &one, 1061 }, 1062 { 1063 .procname = "hung_task_check_count", 1064 .data = &sysctl_hung_task_check_count, 1065 .maxlen = sizeof(int), 1066 .mode = 0644, 1067 .proc_handler = proc_dointvec_minmax, 1068 .extra1 = &zero, 1069 }, 1070 { 1071 .procname = "hung_task_timeout_secs", 1072 .data = &sysctl_hung_task_timeout_secs, 1073 .maxlen = sizeof(unsigned long), 1074 .mode = 0644, 1075 .proc_handler = proc_dohung_task_timeout_secs, 1076 .extra2 = &hung_task_timeout_max, 1077 }, 1078 { 1079 .procname = "hung_task_warnings", 1080 .data = &sysctl_hung_task_warnings, 1081 .maxlen = sizeof(int), 1082 .mode = 0644, 1083 .proc_handler = proc_dointvec_minmax, 1084 .extra1 = &neg_one, 1085 }, 1086 #endif 1087 #ifdef CONFIG_COMPAT 1088 { 1089 .procname = "compat-log", 1090 .data = &compat_log, 1091 .maxlen = sizeof (int), 1092 .mode = 0644, 1093 .proc_handler = proc_dointvec, 1094 }, 1095 #endif 1096 #ifdef CONFIG_RT_MUTEXES 1097 { 1098 .procname = "max_lock_depth", 1099 .data = &max_lock_depth, 1100 .maxlen = sizeof(int), 1101 .mode = 0644, 1102 .proc_handler = proc_dointvec, 1103 }, 1104 #endif 1105 { 1106 .procname = "poweroff_cmd", 1107 .data = &poweroff_cmd, 1108 .maxlen = POWEROFF_CMD_PATH_LEN, 1109 .mode = 0644, 1110 .proc_handler = proc_dostring, 1111 }, 1112 #ifdef CONFIG_KEYS 1113 { 1114 .procname = "keys", 1115 .mode = 0555, 1116 .child = key_sysctls, 1117 }, 1118 #endif 1119 #ifdef CONFIG_PERF_EVENTS 1120 /* 1121 * User-space scripts rely on the existence of this file 1122 * as a feature check for perf_events being enabled. 1123 * 1124 * So it's an ABI, do not remove! 1125 */ 1126 { 1127 .procname = "perf_event_paranoid", 1128 .data = &sysctl_perf_event_paranoid, 1129 .maxlen = sizeof(sysctl_perf_event_paranoid), 1130 .mode = 0644, 1131 .proc_handler = proc_dointvec, 1132 }, 1133 { 1134 .procname = "perf_event_mlock_kb", 1135 .data = &sysctl_perf_event_mlock, 1136 .maxlen = sizeof(sysctl_perf_event_mlock), 1137 .mode = 0644, 1138 .proc_handler = proc_dointvec, 1139 }, 1140 { 1141 .procname = "perf_event_max_sample_rate", 1142 .data = &sysctl_perf_event_sample_rate, 1143 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1144 .mode = 0644, 1145 .proc_handler = perf_proc_update_handler, 1146 .extra1 = &one, 1147 }, 1148 { 1149 .procname = "perf_cpu_time_max_percent", 1150 .data = &sysctl_perf_cpu_time_max_percent, 1151 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1152 .mode = 0644, 1153 .proc_handler = perf_cpu_time_max_percent_handler, 1154 .extra1 = &zero, 1155 .extra2 = &one_hundred, 1156 }, 1157 { 1158 .procname = "perf_event_max_stack", 1159 .data = &sysctl_perf_event_max_stack, 1160 .maxlen = sizeof(sysctl_perf_event_max_stack), 1161 .mode = 0644, 1162 .proc_handler = perf_event_max_stack_handler, 1163 .extra1 = &zero, 1164 .extra2 = &six_hundred_forty_kb, 1165 }, 1166 { 1167 .procname = "perf_event_max_contexts_per_stack", 1168 .data = &sysctl_perf_event_max_contexts_per_stack, 1169 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1170 .mode = 0644, 1171 .proc_handler = perf_event_max_stack_handler, 1172 .extra1 = &zero, 1173 .extra2 = &one_thousand, 1174 }, 1175 #endif 1176 #ifdef CONFIG_KMEMCHECK 1177 { 1178 .procname = "kmemcheck", 1179 .data = &kmemcheck_enabled, 1180 .maxlen = sizeof(int), 1181 .mode = 0644, 1182 .proc_handler = proc_dointvec, 1183 }, 1184 #endif 1185 { 1186 .procname = "panic_on_warn", 1187 .data = &panic_on_warn, 1188 .maxlen = sizeof(int), 1189 .mode = 0644, 1190 .proc_handler = proc_dointvec_minmax, 1191 .extra1 = &zero, 1192 .extra2 = &one, 1193 }, 1194 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1195 { 1196 .procname = "timer_migration", 1197 .data = &sysctl_timer_migration, 1198 .maxlen = sizeof(unsigned int), 1199 .mode = 0644, 1200 .proc_handler = timer_migration_handler, 1201 }, 1202 #endif 1203 #ifdef CONFIG_BPF_SYSCALL 1204 { 1205 .procname = "unprivileged_bpf_disabled", 1206 .data = &sysctl_unprivileged_bpf_disabled, 1207 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1208 .mode = 0644, 1209 /* only handle a transition from default "0" to "1" */ 1210 .proc_handler = proc_dointvec_minmax, 1211 .extra1 = &one, 1212 .extra2 = &one, 1213 }, 1214 #endif 1215 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1216 { 1217 .procname = "panic_on_rcu_stall", 1218 .data = &sysctl_panic_on_rcu_stall, 1219 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1220 .mode = 0644, 1221 .proc_handler = proc_dointvec_minmax, 1222 .extra1 = &zero, 1223 .extra2 = &one, 1224 }, 1225 #endif 1226 { } 1227 }; 1228 1229 static struct ctl_table vm_table[] = { 1230 { 1231 .procname = "overcommit_memory", 1232 .data = &sysctl_overcommit_memory, 1233 .maxlen = sizeof(sysctl_overcommit_memory), 1234 .mode = 0644, 1235 .proc_handler = proc_dointvec_minmax, 1236 .extra1 = &zero, 1237 .extra2 = &two, 1238 }, 1239 { 1240 .procname = "panic_on_oom", 1241 .data = &sysctl_panic_on_oom, 1242 .maxlen = sizeof(sysctl_panic_on_oom), 1243 .mode = 0644, 1244 .proc_handler = proc_dointvec_minmax, 1245 .extra1 = &zero, 1246 .extra2 = &two, 1247 }, 1248 { 1249 .procname = "oom_kill_allocating_task", 1250 .data = &sysctl_oom_kill_allocating_task, 1251 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1252 .mode = 0644, 1253 .proc_handler = proc_dointvec, 1254 }, 1255 { 1256 .procname = "oom_dump_tasks", 1257 .data = &sysctl_oom_dump_tasks, 1258 .maxlen = sizeof(sysctl_oom_dump_tasks), 1259 .mode = 0644, 1260 .proc_handler = proc_dointvec, 1261 }, 1262 { 1263 .procname = "overcommit_ratio", 1264 .data = &sysctl_overcommit_ratio, 1265 .maxlen = sizeof(sysctl_overcommit_ratio), 1266 .mode = 0644, 1267 .proc_handler = overcommit_ratio_handler, 1268 }, 1269 { 1270 .procname = "overcommit_kbytes", 1271 .data = &sysctl_overcommit_kbytes, 1272 .maxlen = sizeof(sysctl_overcommit_kbytes), 1273 .mode = 0644, 1274 .proc_handler = overcommit_kbytes_handler, 1275 }, 1276 { 1277 .procname = "page-cluster", 1278 .data = &page_cluster, 1279 .maxlen = sizeof(int), 1280 .mode = 0644, 1281 .proc_handler = proc_dointvec_minmax, 1282 .extra1 = &zero, 1283 }, 1284 { 1285 .procname = "dirty_background_ratio", 1286 .data = &dirty_background_ratio, 1287 .maxlen = sizeof(dirty_background_ratio), 1288 .mode = 0644, 1289 .proc_handler = dirty_background_ratio_handler, 1290 .extra1 = &zero, 1291 .extra2 = &one_hundred, 1292 }, 1293 { 1294 .procname = "dirty_background_bytes", 1295 .data = &dirty_background_bytes, 1296 .maxlen = sizeof(dirty_background_bytes), 1297 .mode = 0644, 1298 .proc_handler = dirty_background_bytes_handler, 1299 .extra1 = &one_ul, 1300 }, 1301 { 1302 .procname = "dirty_ratio", 1303 .data = &vm_dirty_ratio, 1304 .maxlen = sizeof(vm_dirty_ratio), 1305 .mode = 0644, 1306 .proc_handler = dirty_ratio_handler, 1307 .extra1 = &zero, 1308 .extra2 = &one_hundred, 1309 }, 1310 { 1311 .procname = "dirty_bytes", 1312 .data = &vm_dirty_bytes, 1313 .maxlen = sizeof(vm_dirty_bytes), 1314 .mode = 0644, 1315 .proc_handler = dirty_bytes_handler, 1316 .extra1 = &dirty_bytes_min, 1317 }, 1318 { 1319 .procname = "dirty_writeback_centisecs", 1320 .data = &dirty_writeback_interval, 1321 .maxlen = sizeof(dirty_writeback_interval), 1322 .mode = 0644, 1323 .proc_handler = dirty_writeback_centisecs_handler, 1324 }, 1325 { 1326 .procname = "dirty_expire_centisecs", 1327 .data = &dirty_expire_interval, 1328 .maxlen = sizeof(dirty_expire_interval), 1329 .mode = 0644, 1330 .proc_handler = proc_dointvec_minmax, 1331 .extra1 = &zero, 1332 }, 1333 { 1334 .procname = "dirtytime_expire_seconds", 1335 .data = &dirtytime_expire_interval, 1336 .maxlen = sizeof(dirty_expire_interval), 1337 .mode = 0644, 1338 .proc_handler = dirtytime_interval_handler, 1339 .extra1 = &zero, 1340 }, 1341 { 1342 .procname = "nr_pdflush_threads", 1343 .mode = 0444 /* read-only */, 1344 .proc_handler = pdflush_proc_obsolete, 1345 }, 1346 { 1347 .procname = "swappiness", 1348 .data = &vm_swappiness, 1349 .maxlen = sizeof(vm_swappiness), 1350 .mode = 0644, 1351 .proc_handler = proc_dointvec_minmax, 1352 .extra1 = &zero, 1353 .extra2 = &one_hundred, 1354 }, 1355 #ifdef CONFIG_HUGETLB_PAGE 1356 { 1357 .procname = "nr_hugepages", 1358 .data = NULL, 1359 .maxlen = sizeof(unsigned long), 1360 .mode = 0644, 1361 .proc_handler = hugetlb_sysctl_handler, 1362 }, 1363 #ifdef CONFIG_NUMA 1364 { 1365 .procname = "nr_hugepages_mempolicy", 1366 .data = NULL, 1367 .maxlen = sizeof(unsigned long), 1368 .mode = 0644, 1369 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1370 }, 1371 #endif 1372 { 1373 .procname = "hugetlb_shm_group", 1374 .data = &sysctl_hugetlb_shm_group, 1375 .maxlen = sizeof(gid_t), 1376 .mode = 0644, 1377 .proc_handler = proc_dointvec, 1378 }, 1379 { 1380 .procname = "hugepages_treat_as_movable", 1381 .data = &hugepages_treat_as_movable, 1382 .maxlen = sizeof(int), 1383 .mode = 0644, 1384 .proc_handler = proc_dointvec, 1385 }, 1386 { 1387 .procname = "nr_overcommit_hugepages", 1388 .data = NULL, 1389 .maxlen = sizeof(unsigned long), 1390 .mode = 0644, 1391 .proc_handler = hugetlb_overcommit_handler, 1392 }, 1393 #endif 1394 { 1395 .procname = "lowmem_reserve_ratio", 1396 .data = &sysctl_lowmem_reserve_ratio, 1397 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1398 .mode = 0644, 1399 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1400 }, 1401 { 1402 .procname = "drop_caches", 1403 .data = &sysctl_drop_caches, 1404 .maxlen = sizeof(int), 1405 .mode = 0644, 1406 .proc_handler = drop_caches_sysctl_handler, 1407 .extra1 = &one, 1408 .extra2 = &four, 1409 }, 1410 #ifdef CONFIG_COMPACTION 1411 { 1412 .procname = "compact_memory", 1413 .data = &sysctl_compact_memory, 1414 .maxlen = sizeof(int), 1415 .mode = 0200, 1416 .proc_handler = sysctl_compaction_handler, 1417 }, 1418 { 1419 .procname = "extfrag_threshold", 1420 .data = &sysctl_extfrag_threshold, 1421 .maxlen = sizeof(int), 1422 .mode = 0644, 1423 .proc_handler = sysctl_extfrag_handler, 1424 .extra1 = &min_extfrag_threshold, 1425 .extra2 = &max_extfrag_threshold, 1426 }, 1427 { 1428 .procname = "compact_unevictable_allowed", 1429 .data = &sysctl_compact_unevictable_allowed, 1430 .maxlen = sizeof(int), 1431 .mode = 0644, 1432 .proc_handler = proc_dointvec, 1433 .extra1 = &zero, 1434 .extra2 = &one, 1435 }, 1436 1437 #endif /* CONFIG_COMPACTION */ 1438 { 1439 .procname = "min_free_kbytes", 1440 .data = &min_free_kbytes, 1441 .maxlen = sizeof(min_free_kbytes), 1442 .mode = 0644, 1443 .proc_handler = min_free_kbytes_sysctl_handler, 1444 .extra1 = &zero, 1445 }, 1446 { 1447 .procname = "watermark_scale_factor", 1448 .data = &watermark_scale_factor, 1449 .maxlen = sizeof(watermark_scale_factor), 1450 .mode = 0644, 1451 .proc_handler = watermark_scale_factor_sysctl_handler, 1452 .extra1 = &one, 1453 .extra2 = &one_thousand, 1454 }, 1455 { 1456 .procname = "percpu_pagelist_fraction", 1457 .data = &percpu_pagelist_fraction, 1458 .maxlen = sizeof(percpu_pagelist_fraction), 1459 .mode = 0644, 1460 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1461 .extra1 = &zero, 1462 }, 1463 #ifdef CONFIG_MMU 1464 { 1465 .procname = "max_map_count", 1466 .data = &sysctl_max_map_count, 1467 .maxlen = sizeof(sysctl_max_map_count), 1468 .mode = 0644, 1469 .proc_handler = proc_dointvec_minmax, 1470 .extra1 = &zero, 1471 }, 1472 #else 1473 { 1474 .procname = "nr_trim_pages", 1475 .data = &sysctl_nr_trim_pages, 1476 .maxlen = sizeof(sysctl_nr_trim_pages), 1477 .mode = 0644, 1478 .proc_handler = proc_dointvec_minmax, 1479 .extra1 = &zero, 1480 }, 1481 #endif 1482 { 1483 .procname = "laptop_mode", 1484 .data = &laptop_mode, 1485 .maxlen = sizeof(laptop_mode), 1486 .mode = 0644, 1487 .proc_handler = proc_dointvec_jiffies, 1488 }, 1489 { 1490 .procname = "block_dump", 1491 .data = &block_dump, 1492 .maxlen = sizeof(block_dump), 1493 .mode = 0644, 1494 .proc_handler = proc_dointvec, 1495 .extra1 = &zero, 1496 }, 1497 { 1498 .procname = "vfs_cache_pressure", 1499 .data = &sysctl_vfs_cache_pressure, 1500 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1501 .mode = 0644, 1502 .proc_handler = proc_dointvec, 1503 .extra1 = &zero, 1504 }, 1505 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1506 { 1507 .procname = "legacy_va_layout", 1508 .data = &sysctl_legacy_va_layout, 1509 .maxlen = sizeof(sysctl_legacy_va_layout), 1510 .mode = 0644, 1511 .proc_handler = proc_dointvec, 1512 .extra1 = &zero, 1513 }, 1514 #endif 1515 #ifdef CONFIG_NUMA 1516 { 1517 .procname = "zone_reclaim_mode", 1518 .data = &node_reclaim_mode, 1519 .maxlen = sizeof(node_reclaim_mode), 1520 .mode = 0644, 1521 .proc_handler = proc_dointvec, 1522 .extra1 = &zero, 1523 }, 1524 { 1525 .procname = "min_unmapped_ratio", 1526 .data = &sysctl_min_unmapped_ratio, 1527 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1528 .mode = 0644, 1529 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1530 .extra1 = &zero, 1531 .extra2 = &one_hundred, 1532 }, 1533 { 1534 .procname = "min_slab_ratio", 1535 .data = &sysctl_min_slab_ratio, 1536 .maxlen = sizeof(sysctl_min_slab_ratio), 1537 .mode = 0644, 1538 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1539 .extra1 = &zero, 1540 .extra2 = &one_hundred, 1541 }, 1542 #endif 1543 #ifdef CONFIG_SMP 1544 { 1545 .procname = "stat_interval", 1546 .data = &sysctl_stat_interval, 1547 .maxlen = sizeof(sysctl_stat_interval), 1548 .mode = 0644, 1549 .proc_handler = proc_dointvec_jiffies, 1550 }, 1551 { 1552 .procname = "stat_refresh", 1553 .data = NULL, 1554 .maxlen = 0, 1555 .mode = 0600, 1556 .proc_handler = vmstat_refresh, 1557 }, 1558 #endif 1559 #ifdef CONFIG_MMU 1560 { 1561 .procname = "mmap_min_addr", 1562 .data = &dac_mmap_min_addr, 1563 .maxlen = sizeof(unsigned long), 1564 .mode = 0644, 1565 .proc_handler = mmap_min_addr_handler, 1566 }, 1567 #endif 1568 #ifdef CONFIG_NUMA 1569 { 1570 .procname = "numa_zonelist_order", 1571 .data = &numa_zonelist_order, 1572 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1573 .mode = 0644, 1574 .proc_handler = numa_zonelist_order_handler, 1575 }, 1576 #endif 1577 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1578 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1579 { 1580 .procname = "vdso_enabled", 1581 #ifdef CONFIG_X86_32 1582 .data = &vdso32_enabled, 1583 .maxlen = sizeof(vdso32_enabled), 1584 #else 1585 .data = &vdso_enabled, 1586 .maxlen = sizeof(vdso_enabled), 1587 #endif 1588 .mode = 0644, 1589 .proc_handler = proc_dointvec, 1590 .extra1 = &zero, 1591 }, 1592 #endif 1593 #ifdef CONFIG_HIGHMEM 1594 { 1595 .procname = "highmem_is_dirtyable", 1596 .data = &vm_highmem_is_dirtyable, 1597 .maxlen = sizeof(vm_highmem_is_dirtyable), 1598 .mode = 0644, 1599 .proc_handler = proc_dointvec_minmax, 1600 .extra1 = &zero, 1601 .extra2 = &one, 1602 }, 1603 #endif 1604 #ifdef CONFIG_MEMORY_FAILURE 1605 { 1606 .procname = "memory_failure_early_kill", 1607 .data = &sysctl_memory_failure_early_kill, 1608 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1609 .mode = 0644, 1610 .proc_handler = proc_dointvec_minmax, 1611 .extra1 = &zero, 1612 .extra2 = &one, 1613 }, 1614 { 1615 .procname = "memory_failure_recovery", 1616 .data = &sysctl_memory_failure_recovery, 1617 .maxlen = sizeof(sysctl_memory_failure_recovery), 1618 .mode = 0644, 1619 .proc_handler = proc_dointvec_minmax, 1620 .extra1 = &zero, 1621 .extra2 = &one, 1622 }, 1623 #endif 1624 { 1625 .procname = "user_reserve_kbytes", 1626 .data = &sysctl_user_reserve_kbytes, 1627 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1628 .mode = 0644, 1629 .proc_handler = proc_doulongvec_minmax, 1630 }, 1631 { 1632 .procname = "admin_reserve_kbytes", 1633 .data = &sysctl_admin_reserve_kbytes, 1634 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1635 .mode = 0644, 1636 .proc_handler = proc_doulongvec_minmax, 1637 }, 1638 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1639 { 1640 .procname = "mmap_rnd_bits", 1641 .data = &mmap_rnd_bits, 1642 .maxlen = sizeof(mmap_rnd_bits), 1643 .mode = 0600, 1644 .proc_handler = proc_dointvec_minmax, 1645 .extra1 = (void *)&mmap_rnd_bits_min, 1646 .extra2 = (void *)&mmap_rnd_bits_max, 1647 }, 1648 #endif 1649 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1650 { 1651 .procname = "mmap_rnd_compat_bits", 1652 .data = &mmap_rnd_compat_bits, 1653 .maxlen = sizeof(mmap_rnd_compat_bits), 1654 .mode = 0600, 1655 .proc_handler = proc_dointvec_minmax, 1656 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1657 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1658 }, 1659 #endif 1660 { } 1661 }; 1662 1663 static struct ctl_table fs_table[] = { 1664 { 1665 .procname = "inode-nr", 1666 .data = &inodes_stat, 1667 .maxlen = 2*sizeof(long), 1668 .mode = 0444, 1669 .proc_handler = proc_nr_inodes, 1670 }, 1671 { 1672 .procname = "inode-state", 1673 .data = &inodes_stat, 1674 .maxlen = 7*sizeof(long), 1675 .mode = 0444, 1676 .proc_handler = proc_nr_inodes, 1677 }, 1678 { 1679 .procname = "file-nr", 1680 .data = &files_stat, 1681 .maxlen = sizeof(files_stat), 1682 .mode = 0444, 1683 .proc_handler = proc_nr_files, 1684 }, 1685 { 1686 .procname = "file-max", 1687 .data = &files_stat.max_files, 1688 .maxlen = sizeof(files_stat.max_files), 1689 .mode = 0644, 1690 .proc_handler = proc_doulongvec_minmax, 1691 }, 1692 { 1693 .procname = "nr_open", 1694 .data = &sysctl_nr_open, 1695 .maxlen = sizeof(int), 1696 .mode = 0644, 1697 .proc_handler = proc_dointvec_minmax, 1698 .extra1 = &sysctl_nr_open_min, 1699 .extra2 = &sysctl_nr_open_max, 1700 }, 1701 { 1702 .procname = "dentry-state", 1703 .data = &dentry_stat, 1704 .maxlen = 6*sizeof(long), 1705 .mode = 0444, 1706 .proc_handler = proc_nr_dentry, 1707 }, 1708 { 1709 .procname = "overflowuid", 1710 .data = &fs_overflowuid, 1711 .maxlen = sizeof(int), 1712 .mode = 0644, 1713 .proc_handler = proc_dointvec_minmax, 1714 .extra1 = &minolduid, 1715 .extra2 = &maxolduid, 1716 }, 1717 { 1718 .procname = "overflowgid", 1719 .data = &fs_overflowgid, 1720 .maxlen = sizeof(int), 1721 .mode = 0644, 1722 .proc_handler = proc_dointvec_minmax, 1723 .extra1 = &minolduid, 1724 .extra2 = &maxolduid, 1725 }, 1726 #ifdef CONFIG_FILE_LOCKING 1727 { 1728 .procname = "leases-enable", 1729 .data = &leases_enable, 1730 .maxlen = sizeof(int), 1731 .mode = 0644, 1732 .proc_handler = proc_dointvec, 1733 }, 1734 #endif 1735 #ifdef CONFIG_DNOTIFY 1736 { 1737 .procname = "dir-notify-enable", 1738 .data = &dir_notify_enable, 1739 .maxlen = sizeof(int), 1740 .mode = 0644, 1741 .proc_handler = proc_dointvec, 1742 }, 1743 #endif 1744 #ifdef CONFIG_MMU 1745 #ifdef CONFIG_FILE_LOCKING 1746 { 1747 .procname = "lease-break-time", 1748 .data = &lease_break_time, 1749 .maxlen = sizeof(int), 1750 .mode = 0644, 1751 .proc_handler = proc_dointvec, 1752 }, 1753 #endif 1754 #ifdef CONFIG_AIO 1755 { 1756 .procname = "aio-nr", 1757 .data = &aio_nr, 1758 .maxlen = sizeof(aio_nr), 1759 .mode = 0444, 1760 .proc_handler = proc_doulongvec_minmax, 1761 }, 1762 { 1763 .procname = "aio-max-nr", 1764 .data = &aio_max_nr, 1765 .maxlen = sizeof(aio_max_nr), 1766 .mode = 0644, 1767 .proc_handler = proc_doulongvec_minmax, 1768 }, 1769 #endif /* CONFIG_AIO */ 1770 #ifdef CONFIG_INOTIFY_USER 1771 { 1772 .procname = "inotify", 1773 .mode = 0555, 1774 .child = inotify_table, 1775 }, 1776 #endif 1777 #ifdef CONFIG_EPOLL 1778 { 1779 .procname = "epoll", 1780 .mode = 0555, 1781 .child = epoll_table, 1782 }, 1783 #endif 1784 #endif 1785 { 1786 .procname = "protected_symlinks", 1787 .data = &sysctl_protected_symlinks, 1788 .maxlen = sizeof(int), 1789 .mode = 0600, 1790 .proc_handler = proc_dointvec_minmax, 1791 .extra1 = &zero, 1792 .extra2 = &one, 1793 }, 1794 { 1795 .procname = "protected_hardlinks", 1796 .data = &sysctl_protected_hardlinks, 1797 .maxlen = sizeof(int), 1798 .mode = 0600, 1799 .proc_handler = proc_dointvec_minmax, 1800 .extra1 = &zero, 1801 .extra2 = &one, 1802 }, 1803 { 1804 .procname = "suid_dumpable", 1805 .data = &suid_dumpable, 1806 .maxlen = sizeof(int), 1807 .mode = 0644, 1808 .proc_handler = proc_dointvec_minmax_coredump, 1809 .extra1 = &zero, 1810 .extra2 = &two, 1811 }, 1812 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1813 { 1814 .procname = "binfmt_misc", 1815 .mode = 0555, 1816 .child = sysctl_mount_point, 1817 }, 1818 #endif 1819 { 1820 .procname = "pipe-max-size", 1821 .data = &pipe_max_size, 1822 .maxlen = sizeof(int), 1823 .mode = 0644, 1824 .proc_handler = &pipe_proc_fn, 1825 .extra1 = &pipe_min_size, 1826 }, 1827 { 1828 .procname = "pipe-user-pages-hard", 1829 .data = &pipe_user_pages_hard, 1830 .maxlen = sizeof(pipe_user_pages_hard), 1831 .mode = 0644, 1832 .proc_handler = proc_doulongvec_minmax, 1833 }, 1834 { 1835 .procname = "pipe-user-pages-soft", 1836 .data = &pipe_user_pages_soft, 1837 .maxlen = sizeof(pipe_user_pages_soft), 1838 .mode = 0644, 1839 .proc_handler = proc_doulongvec_minmax, 1840 }, 1841 { } 1842 }; 1843 1844 static struct ctl_table debug_table[] = { 1845 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1846 { 1847 .procname = "exception-trace", 1848 .data = &show_unhandled_signals, 1849 .maxlen = sizeof(int), 1850 .mode = 0644, 1851 .proc_handler = proc_dointvec 1852 }, 1853 #endif 1854 #if defined(CONFIG_OPTPROBES) 1855 { 1856 .procname = "kprobes-optimization", 1857 .data = &sysctl_kprobes_optimization, 1858 .maxlen = sizeof(int), 1859 .mode = 0644, 1860 .proc_handler = proc_kprobes_optimization_handler, 1861 .extra1 = &zero, 1862 .extra2 = &one, 1863 }, 1864 #endif 1865 { } 1866 }; 1867 1868 static struct ctl_table dev_table[] = { 1869 { } 1870 }; 1871 1872 int __init sysctl_init(void) 1873 { 1874 struct ctl_table_header *hdr; 1875 1876 hdr = register_sysctl_table(sysctl_base_table); 1877 kmemleak_not_leak(hdr); 1878 return 0; 1879 } 1880 1881 #endif /* CONFIG_SYSCTL */ 1882 1883 /* 1884 * /proc/sys support 1885 */ 1886 1887 #ifdef CONFIG_PROC_SYSCTL 1888 1889 static int _proc_do_string(char *data, int maxlen, int write, 1890 char __user *buffer, 1891 size_t *lenp, loff_t *ppos) 1892 { 1893 size_t len; 1894 char __user *p; 1895 char c; 1896 1897 if (!data || !maxlen || !*lenp) { 1898 *lenp = 0; 1899 return 0; 1900 } 1901 1902 if (write) { 1903 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1904 /* Only continue writes not past the end of buffer. */ 1905 len = strlen(data); 1906 if (len > maxlen - 1) 1907 len = maxlen - 1; 1908 1909 if (*ppos > len) 1910 return 0; 1911 len = *ppos; 1912 } else { 1913 /* Start writing from beginning of buffer. */ 1914 len = 0; 1915 } 1916 1917 *ppos += *lenp; 1918 p = buffer; 1919 while ((p - buffer) < *lenp && len < maxlen - 1) { 1920 if (get_user(c, p++)) 1921 return -EFAULT; 1922 if (c == 0 || c == '\n') 1923 break; 1924 data[len++] = c; 1925 } 1926 data[len] = 0; 1927 } else { 1928 len = strlen(data); 1929 if (len > maxlen) 1930 len = maxlen; 1931 1932 if (*ppos > len) { 1933 *lenp = 0; 1934 return 0; 1935 } 1936 1937 data += *ppos; 1938 len -= *ppos; 1939 1940 if (len > *lenp) 1941 len = *lenp; 1942 if (len) 1943 if (copy_to_user(buffer, data, len)) 1944 return -EFAULT; 1945 if (len < *lenp) { 1946 if (put_user('\n', buffer + len)) 1947 return -EFAULT; 1948 len++; 1949 } 1950 *lenp = len; 1951 *ppos += len; 1952 } 1953 return 0; 1954 } 1955 1956 static void warn_sysctl_write(struct ctl_table *table) 1957 { 1958 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1959 "This will not be supported in the future. To silence this\n" 1960 "warning, set kernel.sysctl_writes_strict = -1\n", 1961 current->comm, table->procname); 1962 } 1963 1964 /** 1965 * proc_dostring - read a string sysctl 1966 * @table: the sysctl table 1967 * @write: %TRUE if this is a write to the sysctl file 1968 * @buffer: the user buffer 1969 * @lenp: the size of the user buffer 1970 * @ppos: file position 1971 * 1972 * Reads/writes a string from/to the user buffer. If the kernel 1973 * buffer provided is not large enough to hold the string, the 1974 * string is truncated. The copied string is %NULL-terminated. 1975 * If the string is being read by the user process, it is copied 1976 * and a newline '\n' is added. It is truncated if the buffer is 1977 * not large enough. 1978 * 1979 * Returns 0 on success. 1980 */ 1981 int proc_dostring(struct ctl_table *table, int write, 1982 void __user *buffer, size_t *lenp, loff_t *ppos) 1983 { 1984 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1985 warn_sysctl_write(table); 1986 1987 return _proc_do_string((char *)(table->data), table->maxlen, write, 1988 (char __user *)buffer, lenp, ppos); 1989 } 1990 1991 static size_t proc_skip_spaces(char **buf) 1992 { 1993 size_t ret; 1994 char *tmp = skip_spaces(*buf); 1995 ret = tmp - *buf; 1996 *buf = tmp; 1997 return ret; 1998 } 1999 2000 static void proc_skip_char(char **buf, size_t *size, const char v) 2001 { 2002 while (*size) { 2003 if (**buf != v) 2004 break; 2005 (*size)--; 2006 (*buf)++; 2007 } 2008 } 2009 2010 #define TMPBUFLEN 22 2011 /** 2012 * proc_get_long - reads an ASCII formatted integer from a user buffer 2013 * 2014 * @buf: a kernel buffer 2015 * @size: size of the kernel buffer 2016 * @val: this is where the number will be stored 2017 * @neg: set to %TRUE if number is negative 2018 * @perm_tr: a vector which contains the allowed trailers 2019 * @perm_tr_len: size of the perm_tr vector 2020 * @tr: pointer to store the trailer character 2021 * 2022 * In case of success %0 is returned and @buf and @size are updated with 2023 * the amount of bytes read. If @tr is non-NULL and a trailing 2024 * character exists (size is non-zero after returning from this 2025 * function), @tr is updated with the trailing character. 2026 */ 2027 static int proc_get_long(char **buf, size_t *size, 2028 unsigned long *val, bool *neg, 2029 const char *perm_tr, unsigned perm_tr_len, char *tr) 2030 { 2031 int len; 2032 char *p, tmp[TMPBUFLEN]; 2033 2034 if (!*size) 2035 return -EINVAL; 2036 2037 len = *size; 2038 if (len > TMPBUFLEN - 1) 2039 len = TMPBUFLEN - 1; 2040 2041 memcpy(tmp, *buf, len); 2042 2043 tmp[len] = 0; 2044 p = tmp; 2045 if (*p == '-' && *size > 1) { 2046 *neg = true; 2047 p++; 2048 } else 2049 *neg = false; 2050 if (!isdigit(*p)) 2051 return -EINVAL; 2052 2053 *val = simple_strtoul(p, &p, 0); 2054 2055 len = p - tmp; 2056 2057 /* We don't know if the next char is whitespace thus we may accept 2058 * invalid integers (e.g. 1234...a) or two integers instead of one 2059 * (e.g. 123...1). So lets not allow such large numbers. */ 2060 if (len == TMPBUFLEN - 1) 2061 return -EINVAL; 2062 2063 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2064 return -EINVAL; 2065 2066 if (tr && (len < *size)) 2067 *tr = *p; 2068 2069 *buf += len; 2070 *size -= len; 2071 2072 return 0; 2073 } 2074 2075 /** 2076 * proc_put_long - converts an integer to a decimal ASCII formatted string 2077 * 2078 * @buf: the user buffer 2079 * @size: the size of the user buffer 2080 * @val: the integer to be converted 2081 * @neg: sign of the number, %TRUE for negative 2082 * 2083 * In case of success %0 is returned and @buf and @size are updated with 2084 * the amount of bytes written. 2085 */ 2086 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2087 bool neg) 2088 { 2089 int len; 2090 char tmp[TMPBUFLEN], *p = tmp; 2091 2092 sprintf(p, "%s%lu", neg ? "-" : "", val); 2093 len = strlen(tmp); 2094 if (len > *size) 2095 len = *size; 2096 if (copy_to_user(*buf, tmp, len)) 2097 return -EFAULT; 2098 *size -= len; 2099 *buf += len; 2100 return 0; 2101 } 2102 #undef TMPBUFLEN 2103 2104 static int proc_put_char(void __user **buf, size_t *size, char c) 2105 { 2106 if (*size) { 2107 char __user **buffer = (char __user **)buf; 2108 if (put_user(c, *buffer)) 2109 return -EFAULT; 2110 (*size)--, (*buffer)++; 2111 *buf = *buffer; 2112 } 2113 return 0; 2114 } 2115 2116 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2117 int *valp, 2118 int write, void *data) 2119 { 2120 if (write) { 2121 if (*negp) { 2122 if (*lvalp > (unsigned long) INT_MAX + 1) 2123 return -EINVAL; 2124 *valp = -*lvalp; 2125 } else { 2126 if (*lvalp > (unsigned long) INT_MAX) 2127 return -EINVAL; 2128 *valp = *lvalp; 2129 } 2130 } else { 2131 int val = *valp; 2132 if (val < 0) { 2133 *negp = true; 2134 *lvalp = -(unsigned long)val; 2135 } else { 2136 *negp = false; 2137 *lvalp = (unsigned long)val; 2138 } 2139 } 2140 return 0; 2141 } 2142 2143 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2144 2145 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2146 int write, void __user *buffer, 2147 size_t *lenp, loff_t *ppos, 2148 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2149 int write, void *data), 2150 void *data) 2151 { 2152 int *i, vleft, first = 1, err = 0; 2153 size_t left; 2154 char *kbuf = NULL, *p; 2155 2156 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2157 *lenp = 0; 2158 return 0; 2159 } 2160 2161 i = (int *) tbl_data; 2162 vleft = table->maxlen / sizeof(*i); 2163 left = *lenp; 2164 2165 if (!conv) 2166 conv = do_proc_dointvec_conv; 2167 2168 if (write) { 2169 if (*ppos) { 2170 switch (sysctl_writes_strict) { 2171 case SYSCTL_WRITES_STRICT: 2172 goto out; 2173 case SYSCTL_WRITES_WARN: 2174 warn_sysctl_write(table); 2175 break; 2176 default: 2177 break; 2178 } 2179 } 2180 2181 if (left > PAGE_SIZE - 1) 2182 left = PAGE_SIZE - 1; 2183 p = kbuf = memdup_user_nul(buffer, left); 2184 if (IS_ERR(kbuf)) 2185 return PTR_ERR(kbuf); 2186 } 2187 2188 for (; left && vleft--; i++, first=0) { 2189 unsigned long lval; 2190 bool neg; 2191 2192 if (write) { 2193 left -= proc_skip_spaces(&p); 2194 2195 if (!left) 2196 break; 2197 err = proc_get_long(&p, &left, &lval, &neg, 2198 proc_wspace_sep, 2199 sizeof(proc_wspace_sep), NULL); 2200 if (err) 2201 break; 2202 if (conv(&neg, &lval, i, 1, data)) { 2203 err = -EINVAL; 2204 break; 2205 } 2206 } else { 2207 if (conv(&neg, &lval, i, 0, data)) { 2208 err = -EINVAL; 2209 break; 2210 } 2211 if (!first) 2212 err = proc_put_char(&buffer, &left, '\t'); 2213 if (err) 2214 break; 2215 err = proc_put_long(&buffer, &left, lval, neg); 2216 if (err) 2217 break; 2218 } 2219 } 2220 2221 if (!write && !first && left && !err) 2222 err = proc_put_char(&buffer, &left, '\n'); 2223 if (write && !err && left) 2224 left -= proc_skip_spaces(&p); 2225 if (write) { 2226 kfree(kbuf); 2227 if (first) 2228 return err ? : -EINVAL; 2229 } 2230 *lenp -= left; 2231 out: 2232 *ppos += *lenp; 2233 return err; 2234 } 2235 2236 static int do_proc_dointvec(struct ctl_table *table, int write, 2237 void __user *buffer, size_t *lenp, loff_t *ppos, 2238 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2239 int write, void *data), 2240 void *data) 2241 { 2242 return __do_proc_dointvec(table->data, table, write, 2243 buffer, lenp, ppos, conv, data); 2244 } 2245 2246 /** 2247 * proc_dointvec - read a vector of integers 2248 * @table: the sysctl table 2249 * @write: %TRUE if this is a write to the sysctl file 2250 * @buffer: the user buffer 2251 * @lenp: the size of the user buffer 2252 * @ppos: file position 2253 * 2254 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2255 * values from/to the user buffer, treated as an ASCII string. 2256 * 2257 * Returns 0 on success. 2258 */ 2259 int proc_dointvec(struct ctl_table *table, int write, 2260 void __user *buffer, size_t *lenp, loff_t *ppos) 2261 { 2262 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2263 NULL,NULL); 2264 } 2265 2266 /* 2267 * Taint values can only be increased 2268 * This means we can safely use a temporary. 2269 */ 2270 static int proc_taint(struct ctl_table *table, int write, 2271 void __user *buffer, size_t *lenp, loff_t *ppos) 2272 { 2273 struct ctl_table t; 2274 unsigned long tmptaint = get_taint(); 2275 int err; 2276 2277 if (write && !capable(CAP_SYS_ADMIN)) 2278 return -EPERM; 2279 2280 t = *table; 2281 t.data = &tmptaint; 2282 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2283 if (err < 0) 2284 return err; 2285 2286 if (write) { 2287 /* 2288 * Poor man's atomic or. Not worth adding a primitive 2289 * to everyone's atomic.h for this 2290 */ 2291 int i; 2292 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2293 if ((tmptaint >> i) & 1) 2294 add_taint(i, LOCKDEP_STILL_OK); 2295 } 2296 } 2297 2298 return err; 2299 } 2300 2301 #ifdef CONFIG_PRINTK 2302 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2303 void __user *buffer, size_t *lenp, loff_t *ppos) 2304 { 2305 if (write && !capable(CAP_SYS_ADMIN)) 2306 return -EPERM; 2307 2308 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2309 } 2310 #endif 2311 2312 struct do_proc_dointvec_minmax_conv_param { 2313 int *min; 2314 int *max; 2315 }; 2316 2317 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2318 int *valp, 2319 int write, void *data) 2320 { 2321 struct do_proc_dointvec_minmax_conv_param *param = data; 2322 if (write) { 2323 int val = *negp ? -*lvalp : *lvalp; 2324 if ((param->min && *param->min > val) || 2325 (param->max && *param->max < val)) 2326 return -EINVAL; 2327 *valp = val; 2328 } else { 2329 int val = *valp; 2330 if (val < 0) { 2331 *negp = true; 2332 *lvalp = -(unsigned long)val; 2333 } else { 2334 *negp = false; 2335 *lvalp = (unsigned long)val; 2336 } 2337 } 2338 return 0; 2339 } 2340 2341 /** 2342 * proc_dointvec_minmax - read a vector of integers with min/max values 2343 * @table: the sysctl table 2344 * @write: %TRUE if this is a write to the sysctl file 2345 * @buffer: the user buffer 2346 * @lenp: the size of the user buffer 2347 * @ppos: file position 2348 * 2349 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2350 * values from/to the user buffer, treated as an ASCII string. 2351 * 2352 * This routine will ensure the values are within the range specified by 2353 * table->extra1 (min) and table->extra2 (max). 2354 * 2355 * Returns 0 on success. 2356 */ 2357 int proc_dointvec_minmax(struct ctl_table *table, int write, 2358 void __user *buffer, size_t *lenp, loff_t *ppos) 2359 { 2360 struct do_proc_dointvec_minmax_conv_param param = { 2361 .min = (int *) table->extra1, 2362 .max = (int *) table->extra2, 2363 }; 2364 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2365 do_proc_dointvec_minmax_conv, ¶m); 2366 } 2367 2368 static void validate_coredump_safety(void) 2369 { 2370 #ifdef CONFIG_COREDUMP 2371 if (suid_dumpable == SUID_DUMP_ROOT && 2372 core_pattern[0] != '/' && core_pattern[0] != '|') { 2373 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2374 "suid_dumpable=2. Pipe handler or fully qualified "\ 2375 "core dump path required.\n"); 2376 } 2377 #endif 2378 } 2379 2380 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2381 void __user *buffer, size_t *lenp, loff_t *ppos) 2382 { 2383 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2384 if (!error) 2385 validate_coredump_safety(); 2386 return error; 2387 } 2388 2389 #ifdef CONFIG_COREDUMP 2390 static int proc_dostring_coredump(struct ctl_table *table, int write, 2391 void __user *buffer, size_t *lenp, loff_t *ppos) 2392 { 2393 int error = proc_dostring(table, write, buffer, lenp, ppos); 2394 if (!error) 2395 validate_coredump_safety(); 2396 return error; 2397 } 2398 #endif 2399 2400 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2401 void __user *buffer, 2402 size_t *lenp, loff_t *ppos, 2403 unsigned long convmul, 2404 unsigned long convdiv) 2405 { 2406 unsigned long *i, *min, *max; 2407 int vleft, first = 1, err = 0; 2408 size_t left; 2409 char *kbuf = NULL, *p; 2410 2411 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2412 *lenp = 0; 2413 return 0; 2414 } 2415 2416 i = (unsigned long *) data; 2417 min = (unsigned long *) table->extra1; 2418 max = (unsigned long *) table->extra2; 2419 vleft = table->maxlen / sizeof(unsigned long); 2420 left = *lenp; 2421 2422 if (write) { 2423 if (*ppos) { 2424 switch (sysctl_writes_strict) { 2425 case SYSCTL_WRITES_STRICT: 2426 goto out; 2427 case SYSCTL_WRITES_WARN: 2428 warn_sysctl_write(table); 2429 break; 2430 default: 2431 break; 2432 } 2433 } 2434 2435 if (left > PAGE_SIZE - 1) 2436 left = PAGE_SIZE - 1; 2437 p = kbuf = memdup_user_nul(buffer, left); 2438 if (IS_ERR(kbuf)) 2439 return PTR_ERR(kbuf); 2440 } 2441 2442 for (; left && vleft--; i++, first = 0) { 2443 unsigned long val; 2444 2445 if (write) { 2446 bool neg; 2447 2448 left -= proc_skip_spaces(&p); 2449 2450 err = proc_get_long(&p, &left, &val, &neg, 2451 proc_wspace_sep, 2452 sizeof(proc_wspace_sep), NULL); 2453 if (err) 2454 break; 2455 if (neg) 2456 continue; 2457 if ((min && val < *min) || (max && val > *max)) 2458 continue; 2459 *i = val; 2460 } else { 2461 val = convdiv * (*i) / convmul; 2462 if (!first) { 2463 err = proc_put_char(&buffer, &left, '\t'); 2464 if (err) 2465 break; 2466 } 2467 err = proc_put_long(&buffer, &left, val, false); 2468 if (err) 2469 break; 2470 } 2471 } 2472 2473 if (!write && !first && left && !err) 2474 err = proc_put_char(&buffer, &left, '\n'); 2475 if (write && !err) 2476 left -= proc_skip_spaces(&p); 2477 if (write) { 2478 kfree(kbuf); 2479 if (first) 2480 return err ? : -EINVAL; 2481 } 2482 *lenp -= left; 2483 out: 2484 *ppos += *lenp; 2485 return err; 2486 } 2487 2488 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2489 void __user *buffer, 2490 size_t *lenp, loff_t *ppos, 2491 unsigned long convmul, 2492 unsigned long convdiv) 2493 { 2494 return __do_proc_doulongvec_minmax(table->data, table, write, 2495 buffer, lenp, ppos, convmul, convdiv); 2496 } 2497 2498 /** 2499 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2500 * @table: the sysctl table 2501 * @write: %TRUE if this is a write to the sysctl file 2502 * @buffer: the user buffer 2503 * @lenp: the size of the user buffer 2504 * @ppos: file position 2505 * 2506 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2507 * values from/to the user buffer, treated as an ASCII string. 2508 * 2509 * This routine will ensure the values are within the range specified by 2510 * table->extra1 (min) and table->extra2 (max). 2511 * 2512 * Returns 0 on success. 2513 */ 2514 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2515 void __user *buffer, size_t *lenp, loff_t *ppos) 2516 { 2517 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2518 } 2519 2520 /** 2521 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2522 * @table: the sysctl table 2523 * @write: %TRUE if this is a write to the sysctl file 2524 * @buffer: the user buffer 2525 * @lenp: the size of the user buffer 2526 * @ppos: file position 2527 * 2528 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2529 * values from/to the user buffer, treated as an ASCII string. The values 2530 * are treated as milliseconds, and converted to jiffies when they are stored. 2531 * 2532 * This routine will ensure the values are within the range specified by 2533 * table->extra1 (min) and table->extra2 (max). 2534 * 2535 * Returns 0 on success. 2536 */ 2537 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2538 void __user *buffer, 2539 size_t *lenp, loff_t *ppos) 2540 { 2541 return do_proc_doulongvec_minmax(table, write, buffer, 2542 lenp, ppos, HZ, 1000l); 2543 } 2544 2545 2546 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2547 int *valp, 2548 int write, void *data) 2549 { 2550 if (write) { 2551 if (*lvalp > LONG_MAX / HZ) 2552 return 1; 2553 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2554 } else { 2555 int val = *valp; 2556 unsigned long lval; 2557 if (val < 0) { 2558 *negp = true; 2559 lval = -(unsigned long)val; 2560 } else { 2561 *negp = false; 2562 lval = (unsigned long)val; 2563 } 2564 *lvalp = lval / HZ; 2565 } 2566 return 0; 2567 } 2568 2569 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2570 int *valp, 2571 int write, void *data) 2572 { 2573 if (write) { 2574 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2575 return 1; 2576 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2577 } else { 2578 int val = *valp; 2579 unsigned long lval; 2580 if (val < 0) { 2581 *negp = true; 2582 lval = -(unsigned long)val; 2583 } else { 2584 *negp = false; 2585 lval = (unsigned long)val; 2586 } 2587 *lvalp = jiffies_to_clock_t(lval); 2588 } 2589 return 0; 2590 } 2591 2592 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2593 int *valp, 2594 int write, void *data) 2595 { 2596 if (write) { 2597 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2598 2599 if (jif > INT_MAX) 2600 return 1; 2601 *valp = (int)jif; 2602 } else { 2603 int val = *valp; 2604 unsigned long lval; 2605 if (val < 0) { 2606 *negp = true; 2607 lval = -(unsigned long)val; 2608 } else { 2609 *negp = false; 2610 lval = (unsigned long)val; 2611 } 2612 *lvalp = jiffies_to_msecs(lval); 2613 } 2614 return 0; 2615 } 2616 2617 /** 2618 * proc_dointvec_jiffies - read a vector of integers as seconds 2619 * @table: the sysctl table 2620 * @write: %TRUE if this is a write to the sysctl file 2621 * @buffer: the user buffer 2622 * @lenp: the size of the user buffer 2623 * @ppos: file position 2624 * 2625 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2626 * values from/to the user buffer, treated as an ASCII string. 2627 * The values read are assumed to be in seconds, and are converted into 2628 * jiffies. 2629 * 2630 * Returns 0 on success. 2631 */ 2632 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2633 void __user *buffer, size_t *lenp, loff_t *ppos) 2634 { 2635 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2636 do_proc_dointvec_jiffies_conv,NULL); 2637 } 2638 2639 /** 2640 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2641 * @table: the sysctl table 2642 * @write: %TRUE if this is a write to the sysctl file 2643 * @buffer: the user buffer 2644 * @lenp: the size of the user buffer 2645 * @ppos: pointer to the file position 2646 * 2647 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2648 * values from/to the user buffer, treated as an ASCII string. 2649 * The values read are assumed to be in 1/USER_HZ seconds, and 2650 * are converted into jiffies. 2651 * 2652 * Returns 0 on success. 2653 */ 2654 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2655 void __user *buffer, size_t *lenp, loff_t *ppos) 2656 { 2657 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2658 do_proc_dointvec_userhz_jiffies_conv,NULL); 2659 } 2660 2661 /** 2662 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2663 * @table: the sysctl table 2664 * @write: %TRUE if this is a write to the sysctl file 2665 * @buffer: the user buffer 2666 * @lenp: the size of the user buffer 2667 * @ppos: file position 2668 * @ppos: the current position in the file 2669 * 2670 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2671 * values from/to the user buffer, treated as an ASCII string. 2672 * The values read are assumed to be in 1/1000 seconds, and 2673 * are converted into jiffies. 2674 * 2675 * Returns 0 on success. 2676 */ 2677 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2678 void __user *buffer, size_t *lenp, loff_t *ppos) 2679 { 2680 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2681 do_proc_dointvec_ms_jiffies_conv, NULL); 2682 } 2683 2684 static int proc_do_cad_pid(struct ctl_table *table, int write, 2685 void __user *buffer, size_t *lenp, loff_t *ppos) 2686 { 2687 struct pid *new_pid; 2688 pid_t tmp; 2689 int r; 2690 2691 tmp = pid_vnr(cad_pid); 2692 2693 r = __do_proc_dointvec(&tmp, table, write, buffer, 2694 lenp, ppos, NULL, NULL); 2695 if (r || !write) 2696 return r; 2697 2698 new_pid = find_get_pid(tmp); 2699 if (!new_pid) 2700 return -ESRCH; 2701 2702 put_pid(xchg(&cad_pid, new_pid)); 2703 return 0; 2704 } 2705 2706 /** 2707 * proc_do_large_bitmap - read/write from/to a large bitmap 2708 * @table: the sysctl table 2709 * @write: %TRUE if this is a write to the sysctl file 2710 * @buffer: the user buffer 2711 * @lenp: the size of the user buffer 2712 * @ppos: file position 2713 * 2714 * The bitmap is stored at table->data and the bitmap length (in bits) 2715 * in table->maxlen. 2716 * 2717 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2718 * large bitmaps may be represented in a compact manner. Writing into 2719 * the file will clear the bitmap then update it with the given input. 2720 * 2721 * Returns 0 on success. 2722 */ 2723 int proc_do_large_bitmap(struct ctl_table *table, int write, 2724 void __user *buffer, size_t *lenp, loff_t *ppos) 2725 { 2726 int err = 0; 2727 bool first = 1; 2728 size_t left = *lenp; 2729 unsigned long bitmap_len = table->maxlen; 2730 unsigned long *bitmap = *(unsigned long **) table->data; 2731 unsigned long *tmp_bitmap = NULL; 2732 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2733 2734 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2735 *lenp = 0; 2736 return 0; 2737 } 2738 2739 if (write) { 2740 char *kbuf, *p; 2741 2742 if (left > PAGE_SIZE - 1) 2743 left = PAGE_SIZE - 1; 2744 2745 p = kbuf = memdup_user_nul(buffer, left); 2746 if (IS_ERR(kbuf)) 2747 return PTR_ERR(kbuf); 2748 2749 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2750 GFP_KERNEL); 2751 if (!tmp_bitmap) { 2752 kfree(kbuf); 2753 return -ENOMEM; 2754 } 2755 proc_skip_char(&p, &left, '\n'); 2756 while (!err && left) { 2757 unsigned long val_a, val_b; 2758 bool neg; 2759 2760 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 2761 sizeof(tr_a), &c); 2762 if (err) 2763 break; 2764 if (val_a >= bitmap_len || neg) { 2765 err = -EINVAL; 2766 break; 2767 } 2768 2769 val_b = val_a; 2770 if (left) { 2771 p++; 2772 left--; 2773 } 2774 2775 if (c == '-') { 2776 err = proc_get_long(&p, &left, &val_b, 2777 &neg, tr_b, sizeof(tr_b), 2778 &c); 2779 if (err) 2780 break; 2781 if (val_b >= bitmap_len || neg || 2782 val_a > val_b) { 2783 err = -EINVAL; 2784 break; 2785 } 2786 if (left) { 2787 p++; 2788 left--; 2789 } 2790 } 2791 2792 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2793 first = 0; 2794 proc_skip_char(&p, &left, '\n'); 2795 } 2796 kfree(kbuf); 2797 } else { 2798 unsigned long bit_a, bit_b = 0; 2799 2800 while (left) { 2801 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2802 if (bit_a >= bitmap_len) 2803 break; 2804 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2805 bit_a + 1) - 1; 2806 2807 if (!first) { 2808 err = proc_put_char(&buffer, &left, ','); 2809 if (err) 2810 break; 2811 } 2812 err = proc_put_long(&buffer, &left, bit_a, false); 2813 if (err) 2814 break; 2815 if (bit_a != bit_b) { 2816 err = proc_put_char(&buffer, &left, '-'); 2817 if (err) 2818 break; 2819 err = proc_put_long(&buffer, &left, bit_b, false); 2820 if (err) 2821 break; 2822 } 2823 2824 first = 0; bit_b++; 2825 } 2826 if (!err) 2827 err = proc_put_char(&buffer, &left, '\n'); 2828 } 2829 2830 if (!err) { 2831 if (write) { 2832 if (*ppos) 2833 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2834 else 2835 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2836 } 2837 kfree(tmp_bitmap); 2838 *lenp -= left; 2839 *ppos += *lenp; 2840 return 0; 2841 } else { 2842 kfree(tmp_bitmap); 2843 return err; 2844 } 2845 } 2846 2847 #else /* CONFIG_PROC_SYSCTL */ 2848 2849 int proc_dostring(struct ctl_table *table, int write, 2850 void __user *buffer, size_t *lenp, loff_t *ppos) 2851 { 2852 return -ENOSYS; 2853 } 2854 2855 int proc_dointvec(struct ctl_table *table, int write, 2856 void __user *buffer, size_t *lenp, loff_t *ppos) 2857 { 2858 return -ENOSYS; 2859 } 2860 2861 int proc_dointvec_minmax(struct ctl_table *table, int write, 2862 void __user *buffer, size_t *lenp, loff_t *ppos) 2863 { 2864 return -ENOSYS; 2865 } 2866 2867 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2868 void __user *buffer, size_t *lenp, loff_t *ppos) 2869 { 2870 return -ENOSYS; 2871 } 2872 2873 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2874 void __user *buffer, size_t *lenp, loff_t *ppos) 2875 { 2876 return -ENOSYS; 2877 } 2878 2879 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2880 void __user *buffer, size_t *lenp, loff_t *ppos) 2881 { 2882 return -ENOSYS; 2883 } 2884 2885 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2886 void __user *buffer, size_t *lenp, loff_t *ppos) 2887 { 2888 return -ENOSYS; 2889 } 2890 2891 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2892 void __user *buffer, 2893 size_t *lenp, loff_t *ppos) 2894 { 2895 return -ENOSYS; 2896 } 2897 2898 2899 #endif /* CONFIG_PROC_SYSCTL */ 2900 2901 /* 2902 * No sense putting this after each symbol definition, twice, 2903 * exception granted :-) 2904 */ 2905 EXPORT_SYMBOL(proc_dointvec); 2906 EXPORT_SYMBOL(proc_dointvec_jiffies); 2907 EXPORT_SYMBOL(proc_dointvec_minmax); 2908 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2909 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2910 EXPORT_SYMBOL(proc_dostring); 2911 EXPORT_SYMBOL(proc_doulongvec_minmax); 2912 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2913