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 = "dmesg_restrict", 818 .data = &dmesg_restrict, 819 .maxlen = sizeof(int), 820 .mode = 0644, 821 .proc_handler = proc_dointvec_minmax_sysadmin, 822 .extra1 = &zero, 823 .extra2 = &one, 824 }, 825 { 826 .procname = "kptr_restrict", 827 .data = &kptr_restrict, 828 .maxlen = sizeof(int), 829 .mode = 0644, 830 .proc_handler = proc_dointvec_minmax_sysadmin, 831 .extra1 = &zero, 832 .extra2 = &two, 833 }, 834 #endif 835 { 836 .procname = "ngroups_max", 837 .data = &ngroups_max, 838 .maxlen = sizeof (int), 839 .mode = 0444, 840 .proc_handler = proc_dointvec, 841 }, 842 { 843 .procname = "cap_last_cap", 844 .data = (void *)&cap_last_cap, 845 .maxlen = sizeof(int), 846 .mode = 0444, 847 .proc_handler = proc_dointvec, 848 }, 849 #if defined(CONFIG_LOCKUP_DETECTOR) 850 { 851 .procname = "watchdog", 852 .data = &watchdog_user_enabled, 853 .maxlen = sizeof (int), 854 .mode = 0644, 855 .proc_handler = proc_watchdog, 856 .extra1 = &zero, 857 .extra2 = &one, 858 }, 859 { 860 .procname = "watchdog_thresh", 861 .data = &watchdog_thresh, 862 .maxlen = sizeof(int), 863 .mode = 0644, 864 .proc_handler = proc_watchdog_thresh, 865 .extra1 = &zero, 866 .extra2 = &sixty, 867 }, 868 { 869 .procname = "nmi_watchdog", 870 .data = &nmi_watchdog_enabled, 871 .maxlen = sizeof (int), 872 .mode = 0644, 873 .proc_handler = proc_nmi_watchdog, 874 .extra1 = &zero, 875 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) 876 .extra2 = &one, 877 #else 878 .extra2 = &zero, 879 #endif 880 }, 881 { 882 .procname = "soft_watchdog", 883 .data = &soft_watchdog_enabled, 884 .maxlen = sizeof (int), 885 .mode = 0644, 886 .proc_handler = proc_soft_watchdog, 887 .extra1 = &zero, 888 .extra2 = &one, 889 }, 890 { 891 .procname = "watchdog_cpumask", 892 .data = &watchdog_cpumask_bits, 893 .maxlen = NR_CPUS, 894 .mode = 0644, 895 .proc_handler = proc_watchdog_cpumask, 896 }, 897 { 898 .procname = "softlockup_panic", 899 .data = &softlockup_panic, 900 .maxlen = sizeof(int), 901 .mode = 0644, 902 .proc_handler = proc_dointvec_minmax, 903 .extra1 = &zero, 904 .extra2 = &one, 905 }, 906 #ifdef CONFIG_HARDLOCKUP_DETECTOR 907 { 908 .procname = "hardlockup_panic", 909 .data = &hardlockup_panic, 910 .maxlen = sizeof(int), 911 .mode = 0644, 912 .proc_handler = proc_dointvec_minmax, 913 .extra1 = &zero, 914 .extra2 = &one, 915 }, 916 #endif 917 #ifdef CONFIG_SMP 918 { 919 .procname = "softlockup_all_cpu_backtrace", 920 .data = &sysctl_softlockup_all_cpu_backtrace, 921 .maxlen = sizeof(int), 922 .mode = 0644, 923 .proc_handler = proc_dointvec_minmax, 924 .extra1 = &zero, 925 .extra2 = &one, 926 }, 927 { 928 .procname = "hardlockup_all_cpu_backtrace", 929 .data = &sysctl_hardlockup_all_cpu_backtrace, 930 .maxlen = sizeof(int), 931 .mode = 0644, 932 .proc_handler = proc_dointvec_minmax, 933 .extra1 = &zero, 934 .extra2 = &one, 935 }, 936 #endif /* CONFIG_SMP */ 937 #endif 938 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 939 { 940 .procname = "unknown_nmi_panic", 941 .data = &unknown_nmi_panic, 942 .maxlen = sizeof (int), 943 .mode = 0644, 944 .proc_handler = proc_dointvec, 945 }, 946 #endif 947 #if defined(CONFIG_X86) 948 { 949 .procname = "panic_on_unrecovered_nmi", 950 .data = &panic_on_unrecovered_nmi, 951 .maxlen = sizeof(int), 952 .mode = 0644, 953 .proc_handler = proc_dointvec, 954 }, 955 { 956 .procname = "panic_on_io_nmi", 957 .data = &panic_on_io_nmi, 958 .maxlen = sizeof(int), 959 .mode = 0644, 960 .proc_handler = proc_dointvec, 961 }, 962 #ifdef CONFIG_DEBUG_STACKOVERFLOW 963 { 964 .procname = "panic_on_stackoverflow", 965 .data = &sysctl_panic_on_stackoverflow, 966 .maxlen = sizeof(int), 967 .mode = 0644, 968 .proc_handler = proc_dointvec, 969 }, 970 #endif 971 { 972 .procname = "bootloader_type", 973 .data = &bootloader_type, 974 .maxlen = sizeof (int), 975 .mode = 0444, 976 .proc_handler = proc_dointvec, 977 }, 978 { 979 .procname = "bootloader_version", 980 .data = &bootloader_version, 981 .maxlen = sizeof (int), 982 .mode = 0444, 983 .proc_handler = proc_dointvec, 984 }, 985 { 986 .procname = "kstack_depth_to_print", 987 .data = &kstack_depth_to_print, 988 .maxlen = sizeof(int), 989 .mode = 0644, 990 .proc_handler = proc_dointvec, 991 }, 992 { 993 .procname = "io_delay_type", 994 .data = &io_delay_type, 995 .maxlen = sizeof(int), 996 .mode = 0644, 997 .proc_handler = proc_dointvec, 998 }, 999 #endif 1000 #if defined(CONFIG_MMU) 1001 { 1002 .procname = "randomize_va_space", 1003 .data = &randomize_va_space, 1004 .maxlen = sizeof(int), 1005 .mode = 0644, 1006 .proc_handler = proc_dointvec, 1007 }, 1008 #endif 1009 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1010 { 1011 .procname = "spin_retry", 1012 .data = &spin_retry, 1013 .maxlen = sizeof (int), 1014 .mode = 0644, 1015 .proc_handler = proc_dointvec, 1016 }, 1017 #endif 1018 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1019 { 1020 .procname = "acpi_video_flags", 1021 .data = &acpi_realmode_flags, 1022 .maxlen = sizeof (unsigned long), 1023 .mode = 0644, 1024 .proc_handler = proc_doulongvec_minmax, 1025 }, 1026 #endif 1027 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1028 { 1029 .procname = "ignore-unaligned-usertrap", 1030 .data = &no_unaligned_warning, 1031 .maxlen = sizeof (int), 1032 .mode = 0644, 1033 .proc_handler = proc_dointvec, 1034 }, 1035 #endif 1036 #ifdef CONFIG_IA64 1037 { 1038 .procname = "unaligned-dump-stack", 1039 .data = &unaligned_dump_stack, 1040 .maxlen = sizeof (int), 1041 .mode = 0644, 1042 .proc_handler = proc_dointvec, 1043 }, 1044 #endif 1045 #ifdef CONFIG_DETECT_HUNG_TASK 1046 { 1047 .procname = "hung_task_panic", 1048 .data = &sysctl_hung_task_panic, 1049 .maxlen = sizeof(int), 1050 .mode = 0644, 1051 .proc_handler = proc_dointvec_minmax, 1052 .extra1 = &zero, 1053 .extra2 = &one, 1054 }, 1055 { 1056 .procname = "hung_task_check_count", 1057 .data = &sysctl_hung_task_check_count, 1058 .maxlen = sizeof(int), 1059 .mode = 0644, 1060 .proc_handler = proc_dointvec_minmax, 1061 .extra1 = &zero, 1062 }, 1063 { 1064 .procname = "hung_task_timeout_secs", 1065 .data = &sysctl_hung_task_timeout_secs, 1066 .maxlen = sizeof(unsigned long), 1067 .mode = 0644, 1068 .proc_handler = proc_dohung_task_timeout_secs, 1069 .extra2 = &hung_task_timeout_max, 1070 }, 1071 { 1072 .procname = "hung_task_warnings", 1073 .data = &sysctl_hung_task_warnings, 1074 .maxlen = sizeof(int), 1075 .mode = 0644, 1076 .proc_handler = proc_dointvec_minmax, 1077 .extra1 = &neg_one, 1078 }, 1079 #endif 1080 #ifdef CONFIG_COMPAT 1081 { 1082 .procname = "compat-log", 1083 .data = &compat_log, 1084 .maxlen = sizeof (int), 1085 .mode = 0644, 1086 .proc_handler = proc_dointvec, 1087 }, 1088 #endif 1089 #ifdef CONFIG_RT_MUTEXES 1090 { 1091 .procname = "max_lock_depth", 1092 .data = &max_lock_depth, 1093 .maxlen = sizeof(int), 1094 .mode = 0644, 1095 .proc_handler = proc_dointvec, 1096 }, 1097 #endif 1098 { 1099 .procname = "poweroff_cmd", 1100 .data = &poweroff_cmd, 1101 .maxlen = POWEROFF_CMD_PATH_LEN, 1102 .mode = 0644, 1103 .proc_handler = proc_dostring, 1104 }, 1105 #ifdef CONFIG_KEYS 1106 { 1107 .procname = "keys", 1108 .mode = 0555, 1109 .child = key_sysctls, 1110 }, 1111 #endif 1112 #ifdef CONFIG_PERF_EVENTS 1113 /* 1114 * User-space scripts rely on the existence of this file 1115 * as a feature check for perf_events being enabled. 1116 * 1117 * So it's an ABI, do not remove! 1118 */ 1119 { 1120 .procname = "perf_event_paranoid", 1121 .data = &sysctl_perf_event_paranoid, 1122 .maxlen = sizeof(sysctl_perf_event_paranoid), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec, 1125 }, 1126 { 1127 .procname = "perf_event_mlock_kb", 1128 .data = &sysctl_perf_event_mlock, 1129 .maxlen = sizeof(sysctl_perf_event_mlock), 1130 .mode = 0644, 1131 .proc_handler = proc_dointvec, 1132 }, 1133 { 1134 .procname = "perf_event_max_sample_rate", 1135 .data = &sysctl_perf_event_sample_rate, 1136 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1137 .mode = 0644, 1138 .proc_handler = perf_proc_update_handler, 1139 .extra1 = &one, 1140 }, 1141 { 1142 .procname = "perf_cpu_time_max_percent", 1143 .data = &sysctl_perf_cpu_time_max_percent, 1144 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1145 .mode = 0644, 1146 .proc_handler = perf_cpu_time_max_percent_handler, 1147 .extra1 = &zero, 1148 .extra2 = &one_hundred, 1149 }, 1150 { 1151 .procname = "perf_event_max_stack", 1152 .data = NULL, /* filled in by handler */ 1153 .maxlen = sizeof(sysctl_perf_event_max_stack), 1154 .mode = 0644, 1155 .proc_handler = perf_event_max_stack_handler, 1156 .extra1 = &zero, 1157 .extra2 = &six_hundred_forty_kb, 1158 }, 1159 #endif 1160 #ifdef CONFIG_KMEMCHECK 1161 { 1162 .procname = "kmemcheck", 1163 .data = &kmemcheck_enabled, 1164 .maxlen = sizeof(int), 1165 .mode = 0644, 1166 .proc_handler = proc_dointvec, 1167 }, 1168 #endif 1169 { 1170 .procname = "panic_on_warn", 1171 .data = &panic_on_warn, 1172 .maxlen = sizeof(int), 1173 .mode = 0644, 1174 .proc_handler = proc_dointvec_minmax, 1175 .extra1 = &zero, 1176 .extra2 = &one, 1177 }, 1178 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1179 { 1180 .procname = "timer_migration", 1181 .data = &sysctl_timer_migration, 1182 .maxlen = sizeof(unsigned int), 1183 .mode = 0644, 1184 .proc_handler = timer_migration_handler, 1185 }, 1186 #endif 1187 #ifdef CONFIG_BPF_SYSCALL 1188 { 1189 .procname = "unprivileged_bpf_disabled", 1190 .data = &sysctl_unprivileged_bpf_disabled, 1191 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1192 .mode = 0644, 1193 /* only handle a transition from default "0" to "1" */ 1194 .proc_handler = proc_dointvec_minmax, 1195 .extra1 = &one, 1196 .extra2 = &one, 1197 }, 1198 #endif 1199 { } 1200 }; 1201 1202 static struct ctl_table vm_table[] = { 1203 { 1204 .procname = "overcommit_memory", 1205 .data = &sysctl_overcommit_memory, 1206 .maxlen = sizeof(sysctl_overcommit_memory), 1207 .mode = 0644, 1208 .proc_handler = proc_dointvec_minmax, 1209 .extra1 = &zero, 1210 .extra2 = &two, 1211 }, 1212 { 1213 .procname = "panic_on_oom", 1214 .data = &sysctl_panic_on_oom, 1215 .maxlen = sizeof(sysctl_panic_on_oom), 1216 .mode = 0644, 1217 .proc_handler = proc_dointvec_minmax, 1218 .extra1 = &zero, 1219 .extra2 = &two, 1220 }, 1221 { 1222 .procname = "oom_kill_allocating_task", 1223 .data = &sysctl_oom_kill_allocating_task, 1224 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1225 .mode = 0644, 1226 .proc_handler = proc_dointvec, 1227 }, 1228 { 1229 .procname = "oom_dump_tasks", 1230 .data = &sysctl_oom_dump_tasks, 1231 .maxlen = sizeof(sysctl_oom_dump_tasks), 1232 .mode = 0644, 1233 .proc_handler = proc_dointvec, 1234 }, 1235 { 1236 .procname = "overcommit_ratio", 1237 .data = &sysctl_overcommit_ratio, 1238 .maxlen = sizeof(sysctl_overcommit_ratio), 1239 .mode = 0644, 1240 .proc_handler = overcommit_ratio_handler, 1241 }, 1242 { 1243 .procname = "overcommit_kbytes", 1244 .data = &sysctl_overcommit_kbytes, 1245 .maxlen = sizeof(sysctl_overcommit_kbytes), 1246 .mode = 0644, 1247 .proc_handler = overcommit_kbytes_handler, 1248 }, 1249 { 1250 .procname = "page-cluster", 1251 .data = &page_cluster, 1252 .maxlen = sizeof(int), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec_minmax, 1255 .extra1 = &zero, 1256 }, 1257 { 1258 .procname = "dirty_background_ratio", 1259 .data = &dirty_background_ratio, 1260 .maxlen = sizeof(dirty_background_ratio), 1261 .mode = 0644, 1262 .proc_handler = dirty_background_ratio_handler, 1263 .extra1 = &zero, 1264 .extra2 = &one_hundred, 1265 }, 1266 { 1267 .procname = "dirty_background_bytes", 1268 .data = &dirty_background_bytes, 1269 .maxlen = sizeof(dirty_background_bytes), 1270 .mode = 0644, 1271 .proc_handler = dirty_background_bytes_handler, 1272 .extra1 = &one_ul, 1273 }, 1274 { 1275 .procname = "dirty_ratio", 1276 .data = &vm_dirty_ratio, 1277 .maxlen = sizeof(vm_dirty_ratio), 1278 .mode = 0644, 1279 .proc_handler = dirty_ratio_handler, 1280 .extra1 = &zero, 1281 .extra2 = &one_hundred, 1282 }, 1283 { 1284 .procname = "dirty_bytes", 1285 .data = &vm_dirty_bytes, 1286 .maxlen = sizeof(vm_dirty_bytes), 1287 .mode = 0644, 1288 .proc_handler = dirty_bytes_handler, 1289 .extra1 = &dirty_bytes_min, 1290 }, 1291 { 1292 .procname = "dirty_writeback_centisecs", 1293 .data = &dirty_writeback_interval, 1294 .maxlen = sizeof(dirty_writeback_interval), 1295 .mode = 0644, 1296 .proc_handler = dirty_writeback_centisecs_handler, 1297 }, 1298 { 1299 .procname = "dirty_expire_centisecs", 1300 .data = &dirty_expire_interval, 1301 .maxlen = sizeof(dirty_expire_interval), 1302 .mode = 0644, 1303 .proc_handler = proc_dointvec_minmax, 1304 .extra1 = &zero, 1305 }, 1306 { 1307 .procname = "dirtytime_expire_seconds", 1308 .data = &dirtytime_expire_interval, 1309 .maxlen = sizeof(dirty_expire_interval), 1310 .mode = 0644, 1311 .proc_handler = dirtytime_interval_handler, 1312 .extra1 = &zero, 1313 }, 1314 { 1315 .procname = "nr_pdflush_threads", 1316 .mode = 0444 /* read-only */, 1317 .proc_handler = pdflush_proc_obsolete, 1318 }, 1319 { 1320 .procname = "swappiness", 1321 .data = &vm_swappiness, 1322 .maxlen = sizeof(vm_swappiness), 1323 .mode = 0644, 1324 .proc_handler = proc_dointvec_minmax, 1325 .extra1 = &zero, 1326 .extra2 = &one_hundred, 1327 }, 1328 #ifdef CONFIG_HUGETLB_PAGE 1329 { 1330 .procname = "nr_hugepages", 1331 .data = NULL, 1332 .maxlen = sizeof(unsigned long), 1333 .mode = 0644, 1334 .proc_handler = hugetlb_sysctl_handler, 1335 }, 1336 #ifdef CONFIG_NUMA 1337 { 1338 .procname = "nr_hugepages_mempolicy", 1339 .data = NULL, 1340 .maxlen = sizeof(unsigned long), 1341 .mode = 0644, 1342 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1343 }, 1344 #endif 1345 { 1346 .procname = "hugetlb_shm_group", 1347 .data = &sysctl_hugetlb_shm_group, 1348 .maxlen = sizeof(gid_t), 1349 .mode = 0644, 1350 .proc_handler = proc_dointvec, 1351 }, 1352 { 1353 .procname = "hugepages_treat_as_movable", 1354 .data = &hugepages_treat_as_movable, 1355 .maxlen = sizeof(int), 1356 .mode = 0644, 1357 .proc_handler = proc_dointvec, 1358 }, 1359 { 1360 .procname = "nr_overcommit_hugepages", 1361 .data = NULL, 1362 .maxlen = sizeof(unsigned long), 1363 .mode = 0644, 1364 .proc_handler = hugetlb_overcommit_handler, 1365 }, 1366 #endif 1367 { 1368 .procname = "lowmem_reserve_ratio", 1369 .data = &sysctl_lowmem_reserve_ratio, 1370 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1371 .mode = 0644, 1372 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1373 }, 1374 { 1375 .procname = "drop_caches", 1376 .data = &sysctl_drop_caches, 1377 .maxlen = sizeof(int), 1378 .mode = 0644, 1379 .proc_handler = drop_caches_sysctl_handler, 1380 .extra1 = &one, 1381 .extra2 = &four, 1382 }, 1383 #ifdef CONFIG_COMPACTION 1384 { 1385 .procname = "compact_memory", 1386 .data = &sysctl_compact_memory, 1387 .maxlen = sizeof(int), 1388 .mode = 0200, 1389 .proc_handler = sysctl_compaction_handler, 1390 }, 1391 { 1392 .procname = "extfrag_threshold", 1393 .data = &sysctl_extfrag_threshold, 1394 .maxlen = sizeof(int), 1395 .mode = 0644, 1396 .proc_handler = sysctl_extfrag_handler, 1397 .extra1 = &min_extfrag_threshold, 1398 .extra2 = &max_extfrag_threshold, 1399 }, 1400 { 1401 .procname = "compact_unevictable_allowed", 1402 .data = &sysctl_compact_unevictable_allowed, 1403 .maxlen = sizeof(int), 1404 .mode = 0644, 1405 .proc_handler = proc_dointvec, 1406 .extra1 = &zero, 1407 .extra2 = &one, 1408 }, 1409 1410 #endif /* CONFIG_COMPACTION */ 1411 { 1412 .procname = "min_free_kbytes", 1413 .data = &min_free_kbytes, 1414 .maxlen = sizeof(min_free_kbytes), 1415 .mode = 0644, 1416 .proc_handler = min_free_kbytes_sysctl_handler, 1417 .extra1 = &zero, 1418 }, 1419 { 1420 .procname = "watermark_scale_factor", 1421 .data = &watermark_scale_factor, 1422 .maxlen = sizeof(watermark_scale_factor), 1423 .mode = 0644, 1424 .proc_handler = watermark_scale_factor_sysctl_handler, 1425 .extra1 = &one, 1426 .extra2 = &one_thousand, 1427 }, 1428 { 1429 .procname = "percpu_pagelist_fraction", 1430 .data = &percpu_pagelist_fraction, 1431 .maxlen = sizeof(percpu_pagelist_fraction), 1432 .mode = 0644, 1433 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1434 .extra1 = &zero, 1435 }, 1436 #ifdef CONFIG_MMU 1437 { 1438 .procname = "max_map_count", 1439 .data = &sysctl_max_map_count, 1440 .maxlen = sizeof(sysctl_max_map_count), 1441 .mode = 0644, 1442 .proc_handler = proc_dointvec_minmax, 1443 .extra1 = &zero, 1444 }, 1445 #else 1446 { 1447 .procname = "nr_trim_pages", 1448 .data = &sysctl_nr_trim_pages, 1449 .maxlen = sizeof(sysctl_nr_trim_pages), 1450 .mode = 0644, 1451 .proc_handler = proc_dointvec_minmax, 1452 .extra1 = &zero, 1453 }, 1454 #endif 1455 { 1456 .procname = "laptop_mode", 1457 .data = &laptop_mode, 1458 .maxlen = sizeof(laptop_mode), 1459 .mode = 0644, 1460 .proc_handler = proc_dointvec_jiffies, 1461 }, 1462 { 1463 .procname = "block_dump", 1464 .data = &block_dump, 1465 .maxlen = sizeof(block_dump), 1466 .mode = 0644, 1467 .proc_handler = proc_dointvec, 1468 .extra1 = &zero, 1469 }, 1470 { 1471 .procname = "vfs_cache_pressure", 1472 .data = &sysctl_vfs_cache_pressure, 1473 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1474 .mode = 0644, 1475 .proc_handler = proc_dointvec, 1476 .extra1 = &zero, 1477 }, 1478 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1479 { 1480 .procname = "legacy_va_layout", 1481 .data = &sysctl_legacy_va_layout, 1482 .maxlen = sizeof(sysctl_legacy_va_layout), 1483 .mode = 0644, 1484 .proc_handler = proc_dointvec, 1485 .extra1 = &zero, 1486 }, 1487 #endif 1488 #ifdef CONFIG_NUMA 1489 { 1490 .procname = "zone_reclaim_mode", 1491 .data = &zone_reclaim_mode, 1492 .maxlen = sizeof(zone_reclaim_mode), 1493 .mode = 0644, 1494 .proc_handler = proc_dointvec, 1495 .extra1 = &zero, 1496 }, 1497 { 1498 .procname = "min_unmapped_ratio", 1499 .data = &sysctl_min_unmapped_ratio, 1500 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1501 .mode = 0644, 1502 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1503 .extra1 = &zero, 1504 .extra2 = &one_hundred, 1505 }, 1506 { 1507 .procname = "min_slab_ratio", 1508 .data = &sysctl_min_slab_ratio, 1509 .maxlen = sizeof(sysctl_min_slab_ratio), 1510 .mode = 0644, 1511 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1512 .extra1 = &zero, 1513 .extra2 = &one_hundred, 1514 }, 1515 #endif 1516 #ifdef CONFIG_SMP 1517 { 1518 .procname = "stat_interval", 1519 .data = &sysctl_stat_interval, 1520 .maxlen = sizeof(sysctl_stat_interval), 1521 .mode = 0644, 1522 .proc_handler = proc_dointvec_jiffies, 1523 }, 1524 { 1525 .procname = "stat_refresh", 1526 .data = NULL, 1527 .maxlen = 0, 1528 .mode = 0600, 1529 .proc_handler = vmstat_refresh, 1530 }, 1531 #endif 1532 #ifdef CONFIG_MMU 1533 { 1534 .procname = "mmap_min_addr", 1535 .data = &dac_mmap_min_addr, 1536 .maxlen = sizeof(unsigned long), 1537 .mode = 0644, 1538 .proc_handler = mmap_min_addr_handler, 1539 }, 1540 #endif 1541 #ifdef CONFIG_NUMA 1542 { 1543 .procname = "numa_zonelist_order", 1544 .data = &numa_zonelist_order, 1545 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1546 .mode = 0644, 1547 .proc_handler = numa_zonelist_order_handler, 1548 }, 1549 #endif 1550 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1551 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1552 { 1553 .procname = "vdso_enabled", 1554 #ifdef CONFIG_X86_32 1555 .data = &vdso32_enabled, 1556 .maxlen = sizeof(vdso32_enabled), 1557 #else 1558 .data = &vdso_enabled, 1559 .maxlen = sizeof(vdso_enabled), 1560 #endif 1561 .mode = 0644, 1562 .proc_handler = proc_dointvec, 1563 .extra1 = &zero, 1564 }, 1565 #endif 1566 #ifdef CONFIG_HIGHMEM 1567 { 1568 .procname = "highmem_is_dirtyable", 1569 .data = &vm_highmem_is_dirtyable, 1570 .maxlen = sizeof(vm_highmem_is_dirtyable), 1571 .mode = 0644, 1572 .proc_handler = proc_dointvec_minmax, 1573 .extra1 = &zero, 1574 .extra2 = &one, 1575 }, 1576 #endif 1577 #ifdef CONFIG_MEMORY_FAILURE 1578 { 1579 .procname = "memory_failure_early_kill", 1580 .data = &sysctl_memory_failure_early_kill, 1581 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1582 .mode = 0644, 1583 .proc_handler = proc_dointvec_minmax, 1584 .extra1 = &zero, 1585 .extra2 = &one, 1586 }, 1587 { 1588 .procname = "memory_failure_recovery", 1589 .data = &sysctl_memory_failure_recovery, 1590 .maxlen = sizeof(sysctl_memory_failure_recovery), 1591 .mode = 0644, 1592 .proc_handler = proc_dointvec_minmax, 1593 .extra1 = &zero, 1594 .extra2 = &one, 1595 }, 1596 #endif 1597 { 1598 .procname = "user_reserve_kbytes", 1599 .data = &sysctl_user_reserve_kbytes, 1600 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1601 .mode = 0644, 1602 .proc_handler = proc_doulongvec_minmax, 1603 }, 1604 { 1605 .procname = "admin_reserve_kbytes", 1606 .data = &sysctl_admin_reserve_kbytes, 1607 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1608 .mode = 0644, 1609 .proc_handler = proc_doulongvec_minmax, 1610 }, 1611 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1612 { 1613 .procname = "mmap_rnd_bits", 1614 .data = &mmap_rnd_bits, 1615 .maxlen = sizeof(mmap_rnd_bits), 1616 .mode = 0600, 1617 .proc_handler = proc_dointvec_minmax, 1618 .extra1 = (void *)&mmap_rnd_bits_min, 1619 .extra2 = (void *)&mmap_rnd_bits_max, 1620 }, 1621 #endif 1622 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1623 { 1624 .procname = "mmap_rnd_compat_bits", 1625 .data = &mmap_rnd_compat_bits, 1626 .maxlen = sizeof(mmap_rnd_compat_bits), 1627 .mode = 0600, 1628 .proc_handler = proc_dointvec_minmax, 1629 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1630 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1631 }, 1632 #endif 1633 { } 1634 }; 1635 1636 static struct ctl_table fs_table[] = { 1637 { 1638 .procname = "inode-nr", 1639 .data = &inodes_stat, 1640 .maxlen = 2*sizeof(long), 1641 .mode = 0444, 1642 .proc_handler = proc_nr_inodes, 1643 }, 1644 { 1645 .procname = "inode-state", 1646 .data = &inodes_stat, 1647 .maxlen = 7*sizeof(long), 1648 .mode = 0444, 1649 .proc_handler = proc_nr_inodes, 1650 }, 1651 { 1652 .procname = "file-nr", 1653 .data = &files_stat, 1654 .maxlen = sizeof(files_stat), 1655 .mode = 0444, 1656 .proc_handler = proc_nr_files, 1657 }, 1658 { 1659 .procname = "file-max", 1660 .data = &files_stat.max_files, 1661 .maxlen = sizeof(files_stat.max_files), 1662 .mode = 0644, 1663 .proc_handler = proc_doulongvec_minmax, 1664 }, 1665 { 1666 .procname = "nr_open", 1667 .data = &sysctl_nr_open, 1668 .maxlen = sizeof(int), 1669 .mode = 0644, 1670 .proc_handler = proc_dointvec_minmax, 1671 .extra1 = &sysctl_nr_open_min, 1672 .extra2 = &sysctl_nr_open_max, 1673 }, 1674 { 1675 .procname = "dentry-state", 1676 .data = &dentry_stat, 1677 .maxlen = 6*sizeof(long), 1678 .mode = 0444, 1679 .proc_handler = proc_nr_dentry, 1680 }, 1681 { 1682 .procname = "overflowuid", 1683 .data = &fs_overflowuid, 1684 .maxlen = sizeof(int), 1685 .mode = 0644, 1686 .proc_handler = proc_dointvec_minmax, 1687 .extra1 = &minolduid, 1688 .extra2 = &maxolduid, 1689 }, 1690 { 1691 .procname = "overflowgid", 1692 .data = &fs_overflowgid, 1693 .maxlen = sizeof(int), 1694 .mode = 0644, 1695 .proc_handler = proc_dointvec_minmax, 1696 .extra1 = &minolduid, 1697 .extra2 = &maxolduid, 1698 }, 1699 #ifdef CONFIG_FILE_LOCKING 1700 { 1701 .procname = "leases-enable", 1702 .data = &leases_enable, 1703 .maxlen = sizeof(int), 1704 .mode = 0644, 1705 .proc_handler = proc_dointvec, 1706 }, 1707 #endif 1708 #ifdef CONFIG_DNOTIFY 1709 { 1710 .procname = "dir-notify-enable", 1711 .data = &dir_notify_enable, 1712 .maxlen = sizeof(int), 1713 .mode = 0644, 1714 .proc_handler = proc_dointvec, 1715 }, 1716 #endif 1717 #ifdef CONFIG_MMU 1718 #ifdef CONFIG_FILE_LOCKING 1719 { 1720 .procname = "lease-break-time", 1721 .data = &lease_break_time, 1722 .maxlen = sizeof(int), 1723 .mode = 0644, 1724 .proc_handler = proc_dointvec, 1725 }, 1726 #endif 1727 #ifdef CONFIG_AIO 1728 { 1729 .procname = "aio-nr", 1730 .data = &aio_nr, 1731 .maxlen = sizeof(aio_nr), 1732 .mode = 0444, 1733 .proc_handler = proc_doulongvec_minmax, 1734 }, 1735 { 1736 .procname = "aio-max-nr", 1737 .data = &aio_max_nr, 1738 .maxlen = sizeof(aio_max_nr), 1739 .mode = 0644, 1740 .proc_handler = proc_doulongvec_minmax, 1741 }, 1742 #endif /* CONFIG_AIO */ 1743 #ifdef CONFIG_INOTIFY_USER 1744 { 1745 .procname = "inotify", 1746 .mode = 0555, 1747 .child = inotify_table, 1748 }, 1749 #endif 1750 #ifdef CONFIG_EPOLL 1751 { 1752 .procname = "epoll", 1753 .mode = 0555, 1754 .child = epoll_table, 1755 }, 1756 #endif 1757 #endif 1758 { 1759 .procname = "protected_symlinks", 1760 .data = &sysctl_protected_symlinks, 1761 .maxlen = sizeof(int), 1762 .mode = 0600, 1763 .proc_handler = proc_dointvec_minmax, 1764 .extra1 = &zero, 1765 .extra2 = &one, 1766 }, 1767 { 1768 .procname = "protected_hardlinks", 1769 .data = &sysctl_protected_hardlinks, 1770 .maxlen = sizeof(int), 1771 .mode = 0600, 1772 .proc_handler = proc_dointvec_minmax, 1773 .extra1 = &zero, 1774 .extra2 = &one, 1775 }, 1776 { 1777 .procname = "suid_dumpable", 1778 .data = &suid_dumpable, 1779 .maxlen = sizeof(int), 1780 .mode = 0644, 1781 .proc_handler = proc_dointvec_minmax_coredump, 1782 .extra1 = &zero, 1783 .extra2 = &two, 1784 }, 1785 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1786 { 1787 .procname = "binfmt_misc", 1788 .mode = 0555, 1789 .child = sysctl_mount_point, 1790 }, 1791 #endif 1792 { 1793 .procname = "pipe-max-size", 1794 .data = &pipe_max_size, 1795 .maxlen = sizeof(int), 1796 .mode = 0644, 1797 .proc_handler = &pipe_proc_fn, 1798 .extra1 = &pipe_min_size, 1799 }, 1800 { 1801 .procname = "pipe-user-pages-hard", 1802 .data = &pipe_user_pages_hard, 1803 .maxlen = sizeof(pipe_user_pages_hard), 1804 .mode = 0644, 1805 .proc_handler = proc_doulongvec_minmax, 1806 }, 1807 { 1808 .procname = "pipe-user-pages-soft", 1809 .data = &pipe_user_pages_soft, 1810 .maxlen = sizeof(pipe_user_pages_soft), 1811 .mode = 0644, 1812 .proc_handler = proc_doulongvec_minmax, 1813 }, 1814 { } 1815 }; 1816 1817 static struct ctl_table debug_table[] = { 1818 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1819 { 1820 .procname = "exception-trace", 1821 .data = &show_unhandled_signals, 1822 .maxlen = sizeof(int), 1823 .mode = 0644, 1824 .proc_handler = proc_dointvec 1825 }, 1826 #endif 1827 #if defined(CONFIG_OPTPROBES) 1828 { 1829 .procname = "kprobes-optimization", 1830 .data = &sysctl_kprobes_optimization, 1831 .maxlen = sizeof(int), 1832 .mode = 0644, 1833 .proc_handler = proc_kprobes_optimization_handler, 1834 .extra1 = &zero, 1835 .extra2 = &one, 1836 }, 1837 #endif 1838 { } 1839 }; 1840 1841 static struct ctl_table dev_table[] = { 1842 { } 1843 }; 1844 1845 int __init sysctl_init(void) 1846 { 1847 struct ctl_table_header *hdr; 1848 1849 hdr = register_sysctl_table(sysctl_base_table); 1850 kmemleak_not_leak(hdr); 1851 return 0; 1852 } 1853 1854 #endif /* CONFIG_SYSCTL */ 1855 1856 /* 1857 * /proc/sys support 1858 */ 1859 1860 #ifdef CONFIG_PROC_SYSCTL 1861 1862 static int _proc_do_string(char *data, int maxlen, int write, 1863 char __user *buffer, 1864 size_t *lenp, loff_t *ppos) 1865 { 1866 size_t len; 1867 char __user *p; 1868 char c; 1869 1870 if (!data || !maxlen || !*lenp) { 1871 *lenp = 0; 1872 return 0; 1873 } 1874 1875 if (write) { 1876 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1877 /* Only continue writes not past the end of buffer. */ 1878 len = strlen(data); 1879 if (len > maxlen - 1) 1880 len = maxlen - 1; 1881 1882 if (*ppos > len) 1883 return 0; 1884 len = *ppos; 1885 } else { 1886 /* Start writing from beginning of buffer. */ 1887 len = 0; 1888 } 1889 1890 *ppos += *lenp; 1891 p = buffer; 1892 while ((p - buffer) < *lenp && len < maxlen - 1) { 1893 if (get_user(c, p++)) 1894 return -EFAULT; 1895 if (c == 0 || c == '\n') 1896 break; 1897 data[len++] = c; 1898 } 1899 data[len] = 0; 1900 } else { 1901 len = strlen(data); 1902 if (len > maxlen) 1903 len = maxlen; 1904 1905 if (*ppos > len) { 1906 *lenp = 0; 1907 return 0; 1908 } 1909 1910 data += *ppos; 1911 len -= *ppos; 1912 1913 if (len > *lenp) 1914 len = *lenp; 1915 if (len) 1916 if (copy_to_user(buffer, data, len)) 1917 return -EFAULT; 1918 if (len < *lenp) { 1919 if (put_user('\n', buffer + len)) 1920 return -EFAULT; 1921 len++; 1922 } 1923 *lenp = len; 1924 *ppos += len; 1925 } 1926 return 0; 1927 } 1928 1929 static void warn_sysctl_write(struct ctl_table *table) 1930 { 1931 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1932 "This will not be supported in the future. To silence this\n" 1933 "warning, set kernel.sysctl_writes_strict = -1\n", 1934 current->comm, table->procname); 1935 } 1936 1937 /** 1938 * proc_dostring - read a string sysctl 1939 * @table: the sysctl table 1940 * @write: %TRUE if this is a write to the sysctl file 1941 * @buffer: the user buffer 1942 * @lenp: the size of the user buffer 1943 * @ppos: file position 1944 * 1945 * Reads/writes a string from/to the user buffer. If the kernel 1946 * buffer provided is not large enough to hold the string, the 1947 * string is truncated. The copied string is %NULL-terminated. 1948 * If the string is being read by the user process, it is copied 1949 * and a newline '\n' is added. It is truncated if the buffer is 1950 * not large enough. 1951 * 1952 * Returns 0 on success. 1953 */ 1954 int proc_dostring(struct ctl_table *table, int write, 1955 void __user *buffer, size_t *lenp, loff_t *ppos) 1956 { 1957 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1958 warn_sysctl_write(table); 1959 1960 return _proc_do_string((char *)(table->data), table->maxlen, write, 1961 (char __user *)buffer, lenp, ppos); 1962 } 1963 1964 static size_t proc_skip_spaces(char **buf) 1965 { 1966 size_t ret; 1967 char *tmp = skip_spaces(*buf); 1968 ret = tmp - *buf; 1969 *buf = tmp; 1970 return ret; 1971 } 1972 1973 static void proc_skip_char(char **buf, size_t *size, const char v) 1974 { 1975 while (*size) { 1976 if (**buf != v) 1977 break; 1978 (*size)--; 1979 (*buf)++; 1980 } 1981 } 1982 1983 #define TMPBUFLEN 22 1984 /** 1985 * proc_get_long - reads an ASCII formatted integer from a user buffer 1986 * 1987 * @buf: a kernel buffer 1988 * @size: size of the kernel buffer 1989 * @val: this is where the number will be stored 1990 * @neg: set to %TRUE if number is negative 1991 * @perm_tr: a vector which contains the allowed trailers 1992 * @perm_tr_len: size of the perm_tr vector 1993 * @tr: pointer to store the trailer character 1994 * 1995 * In case of success %0 is returned and @buf and @size are updated with 1996 * the amount of bytes read. If @tr is non-NULL and a trailing 1997 * character exists (size is non-zero after returning from this 1998 * function), @tr is updated with the trailing character. 1999 */ 2000 static int proc_get_long(char **buf, size_t *size, 2001 unsigned long *val, bool *neg, 2002 const char *perm_tr, unsigned perm_tr_len, char *tr) 2003 { 2004 int len; 2005 char *p, tmp[TMPBUFLEN]; 2006 2007 if (!*size) 2008 return -EINVAL; 2009 2010 len = *size; 2011 if (len > TMPBUFLEN - 1) 2012 len = TMPBUFLEN - 1; 2013 2014 memcpy(tmp, *buf, len); 2015 2016 tmp[len] = 0; 2017 p = tmp; 2018 if (*p == '-' && *size > 1) { 2019 *neg = true; 2020 p++; 2021 } else 2022 *neg = false; 2023 if (!isdigit(*p)) 2024 return -EINVAL; 2025 2026 *val = simple_strtoul(p, &p, 0); 2027 2028 len = p - tmp; 2029 2030 /* We don't know if the next char is whitespace thus we may accept 2031 * invalid integers (e.g. 1234...a) or two integers instead of one 2032 * (e.g. 123...1). So lets not allow such large numbers. */ 2033 if (len == TMPBUFLEN - 1) 2034 return -EINVAL; 2035 2036 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2037 return -EINVAL; 2038 2039 if (tr && (len < *size)) 2040 *tr = *p; 2041 2042 *buf += len; 2043 *size -= len; 2044 2045 return 0; 2046 } 2047 2048 /** 2049 * proc_put_long - converts an integer to a decimal ASCII formatted string 2050 * 2051 * @buf: the user buffer 2052 * @size: the size of the user buffer 2053 * @val: the integer to be converted 2054 * @neg: sign of the number, %TRUE for negative 2055 * 2056 * In case of success %0 is returned and @buf and @size are updated with 2057 * the amount of bytes written. 2058 */ 2059 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2060 bool neg) 2061 { 2062 int len; 2063 char tmp[TMPBUFLEN], *p = tmp; 2064 2065 sprintf(p, "%s%lu", neg ? "-" : "", val); 2066 len = strlen(tmp); 2067 if (len > *size) 2068 len = *size; 2069 if (copy_to_user(*buf, tmp, len)) 2070 return -EFAULT; 2071 *size -= len; 2072 *buf += len; 2073 return 0; 2074 } 2075 #undef TMPBUFLEN 2076 2077 static int proc_put_char(void __user **buf, size_t *size, char c) 2078 { 2079 if (*size) { 2080 char __user **buffer = (char __user **)buf; 2081 if (put_user(c, *buffer)) 2082 return -EFAULT; 2083 (*size)--, (*buffer)++; 2084 *buf = *buffer; 2085 } 2086 return 0; 2087 } 2088 2089 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2090 int *valp, 2091 int write, void *data) 2092 { 2093 if (write) { 2094 if (*negp) { 2095 if (*lvalp > (unsigned long) INT_MAX + 1) 2096 return -EINVAL; 2097 *valp = -*lvalp; 2098 } else { 2099 if (*lvalp > (unsigned long) INT_MAX) 2100 return -EINVAL; 2101 *valp = *lvalp; 2102 } 2103 } else { 2104 int val = *valp; 2105 if (val < 0) { 2106 *negp = true; 2107 *lvalp = -(unsigned long)val; 2108 } else { 2109 *negp = false; 2110 *lvalp = (unsigned long)val; 2111 } 2112 } 2113 return 0; 2114 } 2115 2116 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2117 2118 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2119 int write, void __user *buffer, 2120 size_t *lenp, loff_t *ppos, 2121 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2122 int write, void *data), 2123 void *data) 2124 { 2125 int *i, vleft, first = 1, err = 0; 2126 size_t left; 2127 char *kbuf = NULL, *p; 2128 2129 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2130 *lenp = 0; 2131 return 0; 2132 } 2133 2134 i = (int *) tbl_data; 2135 vleft = table->maxlen / sizeof(*i); 2136 left = *lenp; 2137 2138 if (!conv) 2139 conv = do_proc_dointvec_conv; 2140 2141 if (write) { 2142 if (*ppos) { 2143 switch (sysctl_writes_strict) { 2144 case SYSCTL_WRITES_STRICT: 2145 goto out; 2146 case SYSCTL_WRITES_WARN: 2147 warn_sysctl_write(table); 2148 break; 2149 default: 2150 break; 2151 } 2152 } 2153 2154 if (left > PAGE_SIZE - 1) 2155 left = PAGE_SIZE - 1; 2156 p = kbuf = memdup_user_nul(buffer, left); 2157 if (IS_ERR(kbuf)) 2158 return PTR_ERR(kbuf); 2159 } 2160 2161 for (; left && vleft--; i++, first=0) { 2162 unsigned long lval; 2163 bool neg; 2164 2165 if (write) { 2166 left -= proc_skip_spaces(&p); 2167 2168 if (!left) 2169 break; 2170 err = proc_get_long(&p, &left, &lval, &neg, 2171 proc_wspace_sep, 2172 sizeof(proc_wspace_sep), NULL); 2173 if (err) 2174 break; 2175 if (conv(&neg, &lval, i, 1, data)) { 2176 err = -EINVAL; 2177 break; 2178 } 2179 } else { 2180 if (conv(&neg, &lval, i, 0, data)) { 2181 err = -EINVAL; 2182 break; 2183 } 2184 if (!first) 2185 err = proc_put_char(&buffer, &left, '\t'); 2186 if (err) 2187 break; 2188 err = proc_put_long(&buffer, &left, lval, neg); 2189 if (err) 2190 break; 2191 } 2192 } 2193 2194 if (!write && !first && left && !err) 2195 err = proc_put_char(&buffer, &left, '\n'); 2196 if (write && !err && left) 2197 left -= proc_skip_spaces(&p); 2198 if (write) { 2199 kfree(kbuf); 2200 if (first) 2201 return err ? : -EINVAL; 2202 } 2203 *lenp -= left; 2204 out: 2205 *ppos += *lenp; 2206 return err; 2207 } 2208 2209 static int do_proc_dointvec(struct ctl_table *table, int write, 2210 void __user *buffer, size_t *lenp, loff_t *ppos, 2211 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2212 int write, void *data), 2213 void *data) 2214 { 2215 return __do_proc_dointvec(table->data, table, write, 2216 buffer, lenp, ppos, conv, data); 2217 } 2218 2219 /** 2220 * proc_dointvec - read a vector of integers 2221 * @table: the sysctl table 2222 * @write: %TRUE if this is a write to the sysctl file 2223 * @buffer: the user buffer 2224 * @lenp: the size of the user buffer 2225 * @ppos: file position 2226 * 2227 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2228 * values from/to the user buffer, treated as an ASCII string. 2229 * 2230 * Returns 0 on success. 2231 */ 2232 int proc_dointvec(struct ctl_table *table, int write, 2233 void __user *buffer, size_t *lenp, loff_t *ppos) 2234 { 2235 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2236 NULL,NULL); 2237 } 2238 2239 /* 2240 * Taint values can only be increased 2241 * This means we can safely use a temporary. 2242 */ 2243 static int proc_taint(struct ctl_table *table, int write, 2244 void __user *buffer, size_t *lenp, loff_t *ppos) 2245 { 2246 struct ctl_table t; 2247 unsigned long tmptaint = get_taint(); 2248 int err; 2249 2250 if (write && !capable(CAP_SYS_ADMIN)) 2251 return -EPERM; 2252 2253 t = *table; 2254 t.data = &tmptaint; 2255 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2256 if (err < 0) 2257 return err; 2258 2259 if (write) { 2260 /* 2261 * Poor man's atomic or. Not worth adding a primitive 2262 * to everyone's atomic.h for this 2263 */ 2264 int i; 2265 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2266 if ((tmptaint >> i) & 1) 2267 add_taint(i, LOCKDEP_STILL_OK); 2268 } 2269 } 2270 2271 return err; 2272 } 2273 2274 #ifdef CONFIG_PRINTK 2275 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2276 void __user *buffer, size_t *lenp, loff_t *ppos) 2277 { 2278 if (write && !capable(CAP_SYS_ADMIN)) 2279 return -EPERM; 2280 2281 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2282 } 2283 #endif 2284 2285 struct do_proc_dointvec_minmax_conv_param { 2286 int *min; 2287 int *max; 2288 }; 2289 2290 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2291 int *valp, 2292 int write, void *data) 2293 { 2294 struct do_proc_dointvec_minmax_conv_param *param = data; 2295 if (write) { 2296 int val = *negp ? -*lvalp : *lvalp; 2297 if ((param->min && *param->min > val) || 2298 (param->max && *param->max < val)) 2299 return -EINVAL; 2300 *valp = val; 2301 } else { 2302 int val = *valp; 2303 if (val < 0) { 2304 *negp = true; 2305 *lvalp = -(unsigned long)val; 2306 } else { 2307 *negp = false; 2308 *lvalp = (unsigned long)val; 2309 } 2310 } 2311 return 0; 2312 } 2313 2314 /** 2315 * proc_dointvec_minmax - read a vector of integers with min/max values 2316 * @table: the sysctl table 2317 * @write: %TRUE if this is a write to the sysctl file 2318 * @buffer: the user buffer 2319 * @lenp: the size of the user buffer 2320 * @ppos: file position 2321 * 2322 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2323 * values from/to the user buffer, treated as an ASCII string. 2324 * 2325 * This routine will ensure the values are within the range specified by 2326 * table->extra1 (min) and table->extra2 (max). 2327 * 2328 * Returns 0 on success. 2329 */ 2330 int proc_dointvec_minmax(struct ctl_table *table, int write, 2331 void __user *buffer, size_t *lenp, loff_t *ppos) 2332 { 2333 struct do_proc_dointvec_minmax_conv_param param = { 2334 .min = (int *) table->extra1, 2335 .max = (int *) table->extra2, 2336 }; 2337 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2338 do_proc_dointvec_minmax_conv, ¶m); 2339 } 2340 2341 static void validate_coredump_safety(void) 2342 { 2343 #ifdef CONFIG_COREDUMP 2344 if (suid_dumpable == SUID_DUMP_ROOT && 2345 core_pattern[0] != '/' && core_pattern[0] != '|') { 2346 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2347 "suid_dumpable=2. Pipe handler or fully qualified "\ 2348 "core dump path required.\n"); 2349 } 2350 #endif 2351 } 2352 2353 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2354 void __user *buffer, size_t *lenp, loff_t *ppos) 2355 { 2356 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2357 if (!error) 2358 validate_coredump_safety(); 2359 return error; 2360 } 2361 2362 #ifdef CONFIG_COREDUMP 2363 static int proc_dostring_coredump(struct ctl_table *table, int write, 2364 void __user *buffer, size_t *lenp, loff_t *ppos) 2365 { 2366 int error = proc_dostring(table, write, buffer, lenp, ppos); 2367 if (!error) 2368 validate_coredump_safety(); 2369 return error; 2370 } 2371 #endif 2372 2373 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2374 void __user *buffer, 2375 size_t *lenp, loff_t *ppos, 2376 unsigned long convmul, 2377 unsigned long convdiv) 2378 { 2379 unsigned long *i, *min, *max; 2380 int vleft, first = 1, err = 0; 2381 size_t left; 2382 char *kbuf = NULL, *p; 2383 2384 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2385 *lenp = 0; 2386 return 0; 2387 } 2388 2389 i = (unsigned long *) data; 2390 min = (unsigned long *) table->extra1; 2391 max = (unsigned long *) table->extra2; 2392 vleft = table->maxlen / sizeof(unsigned long); 2393 left = *lenp; 2394 2395 if (write) { 2396 if (*ppos) { 2397 switch (sysctl_writes_strict) { 2398 case SYSCTL_WRITES_STRICT: 2399 goto out; 2400 case SYSCTL_WRITES_WARN: 2401 warn_sysctl_write(table); 2402 break; 2403 default: 2404 break; 2405 } 2406 } 2407 2408 if (left > PAGE_SIZE - 1) 2409 left = PAGE_SIZE - 1; 2410 p = kbuf = memdup_user_nul(buffer, left); 2411 if (IS_ERR(kbuf)) 2412 return PTR_ERR(kbuf); 2413 } 2414 2415 for (; left && vleft--; i++, first = 0) { 2416 unsigned long val; 2417 2418 if (write) { 2419 bool neg; 2420 2421 left -= proc_skip_spaces(&p); 2422 2423 err = proc_get_long(&p, &left, &val, &neg, 2424 proc_wspace_sep, 2425 sizeof(proc_wspace_sep), NULL); 2426 if (err) 2427 break; 2428 if (neg) 2429 continue; 2430 if ((min && val < *min) || (max && val > *max)) 2431 continue; 2432 *i = val; 2433 } else { 2434 val = convdiv * (*i) / convmul; 2435 if (!first) { 2436 err = proc_put_char(&buffer, &left, '\t'); 2437 if (err) 2438 break; 2439 } 2440 err = proc_put_long(&buffer, &left, val, false); 2441 if (err) 2442 break; 2443 } 2444 } 2445 2446 if (!write && !first && left && !err) 2447 err = proc_put_char(&buffer, &left, '\n'); 2448 if (write && !err) 2449 left -= proc_skip_spaces(&p); 2450 if (write) { 2451 kfree(kbuf); 2452 if (first) 2453 return err ? : -EINVAL; 2454 } 2455 *lenp -= left; 2456 out: 2457 *ppos += *lenp; 2458 return err; 2459 } 2460 2461 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2462 void __user *buffer, 2463 size_t *lenp, loff_t *ppos, 2464 unsigned long convmul, 2465 unsigned long convdiv) 2466 { 2467 return __do_proc_doulongvec_minmax(table->data, table, write, 2468 buffer, lenp, ppos, convmul, convdiv); 2469 } 2470 2471 /** 2472 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2473 * @table: the sysctl table 2474 * @write: %TRUE if this is a write to the sysctl file 2475 * @buffer: the user buffer 2476 * @lenp: the size of the user buffer 2477 * @ppos: file position 2478 * 2479 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2480 * values from/to the user buffer, treated as an ASCII string. 2481 * 2482 * This routine will ensure the values are within the range specified by 2483 * table->extra1 (min) and table->extra2 (max). 2484 * 2485 * Returns 0 on success. 2486 */ 2487 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2488 void __user *buffer, size_t *lenp, loff_t *ppos) 2489 { 2490 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2491 } 2492 2493 /** 2494 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2495 * @table: the sysctl table 2496 * @write: %TRUE if this is a write to the sysctl file 2497 * @buffer: the user buffer 2498 * @lenp: the size of the user buffer 2499 * @ppos: file position 2500 * 2501 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2502 * values from/to the user buffer, treated as an ASCII string. The values 2503 * are treated as milliseconds, and converted to jiffies when they are stored. 2504 * 2505 * This routine will ensure the values are within the range specified by 2506 * table->extra1 (min) and table->extra2 (max). 2507 * 2508 * Returns 0 on success. 2509 */ 2510 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2511 void __user *buffer, 2512 size_t *lenp, loff_t *ppos) 2513 { 2514 return do_proc_doulongvec_minmax(table, write, buffer, 2515 lenp, ppos, HZ, 1000l); 2516 } 2517 2518 2519 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2520 int *valp, 2521 int write, void *data) 2522 { 2523 if (write) { 2524 if (*lvalp > LONG_MAX / HZ) 2525 return 1; 2526 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2527 } else { 2528 int val = *valp; 2529 unsigned long lval; 2530 if (val < 0) { 2531 *negp = true; 2532 lval = -(unsigned long)val; 2533 } else { 2534 *negp = false; 2535 lval = (unsigned long)val; 2536 } 2537 *lvalp = lval / HZ; 2538 } 2539 return 0; 2540 } 2541 2542 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2543 int *valp, 2544 int write, void *data) 2545 { 2546 if (write) { 2547 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2548 return 1; 2549 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2550 } else { 2551 int val = *valp; 2552 unsigned long lval; 2553 if (val < 0) { 2554 *negp = true; 2555 lval = -(unsigned long)val; 2556 } else { 2557 *negp = false; 2558 lval = (unsigned long)val; 2559 } 2560 *lvalp = jiffies_to_clock_t(lval); 2561 } 2562 return 0; 2563 } 2564 2565 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2566 int *valp, 2567 int write, void *data) 2568 { 2569 if (write) { 2570 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2571 2572 if (jif > INT_MAX) 2573 return 1; 2574 *valp = (int)jif; 2575 } else { 2576 int val = *valp; 2577 unsigned long lval; 2578 if (val < 0) { 2579 *negp = true; 2580 lval = -(unsigned long)val; 2581 } else { 2582 *negp = false; 2583 lval = (unsigned long)val; 2584 } 2585 *lvalp = jiffies_to_msecs(lval); 2586 } 2587 return 0; 2588 } 2589 2590 /** 2591 * proc_dointvec_jiffies - read a vector of integers as seconds 2592 * @table: the sysctl table 2593 * @write: %TRUE if this is a write to the sysctl file 2594 * @buffer: the user buffer 2595 * @lenp: the size of the user buffer 2596 * @ppos: file position 2597 * 2598 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2599 * values from/to the user buffer, treated as an ASCII string. 2600 * The values read are assumed to be in seconds, and are converted into 2601 * jiffies. 2602 * 2603 * Returns 0 on success. 2604 */ 2605 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2606 void __user *buffer, size_t *lenp, loff_t *ppos) 2607 { 2608 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2609 do_proc_dointvec_jiffies_conv,NULL); 2610 } 2611 2612 /** 2613 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2614 * @table: the sysctl table 2615 * @write: %TRUE if this is a write to the sysctl file 2616 * @buffer: the user buffer 2617 * @lenp: the size of the user buffer 2618 * @ppos: pointer to the file position 2619 * 2620 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2621 * values from/to the user buffer, treated as an ASCII string. 2622 * The values read are assumed to be in 1/USER_HZ seconds, and 2623 * are converted into jiffies. 2624 * 2625 * Returns 0 on success. 2626 */ 2627 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2628 void __user *buffer, size_t *lenp, loff_t *ppos) 2629 { 2630 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2631 do_proc_dointvec_userhz_jiffies_conv,NULL); 2632 } 2633 2634 /** 2635 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2636 * @table: the sysctl table 2637 * @write: %TRUE if this is a write to the sysctl file 2638 * @buffer: the user buffer 2639 * @lenp: the size of the user buffer 2640 * @ppos: file position 2641 * @ppos: the current position in the file 2642 * 2643 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2644 * values from/to the user buffer, treated as an ASCII string. 2645 * The values read are assumed to be in 1/1000 seconds, and 2646 * are converted into jiffies. 2647 * 2648 * Returns 0 on success. 2649 */ 2650 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2651 void __user *buffer, size_t *lenp, loff_t *ppos) 2652 { 2653 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2654 do_proc_dointvec_ms_jiffies_conv, NULL); 2655 } 2656 2657 static int proc_do_cad_pid(struct ctl_table *table, int write, 2658 void __user *buffer, size_t *lenp, loff_t *ppos) 2659 { 2660 struct pid *new_pid; 2661 pid_t tmp; 2662 int r; 2663 2664 tmp = pid_vnr(cad_pid); 2665 2666 r = __do_proc_dointvec(&tmp, table, write, buffer, 2667 lenp, ppos, NULL, NULL); 2668 if (r || !write) 2669 return r; 2670 2671 new_pid = find_get_pid(tmp); 2672 if (!new_pid) 2673 return -ESRCH; 2674 2675 put_pid(xchg(&cad_pid, new_pid)); 2676 return 0; 2677 } 2678 2679 /** 2680 * proc_do_large_bitmap - read/write from/to a large bitmap 2681 * @table: the sysctl table 2682 * @write: %TRUE if this is a write to the sysctl file 2683 * @buffer: the user buffer 2684 * @lenp: the size of the user buffer 2685 * @ppos: file position 2686 * 2687 * The bitmap is stored at table->data and the bitmap length (in bits) 2688 * in table->maxlen. 2689 * 2690 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2691 * large bitmaps may be represented in a compact manner. Writing into 2692 * the file will clear the bitmap then update it with the given input. 2693 * 2694 * Returns 0 on success. 2695 */ 2696 int proc_do_large_bitmap(struct ctl_table *table, int write, 2697 void __user *buffer, size_t *lenp, loff_t *ppos) 2698 { 2699 int err = 0; 2700 bool first = 1; 2701 size_t left = *lenp; 2702 unsigned long bitmap_len = table->maxlen; 2703 unsigned long *bitmap = *(unsigned long **) table->data; 2704 unsigned long *tmp_bitmap = NULL; 2705 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2706 2707 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2708 *lenp = 0; 2709 return 0; 2710 } 2711 2712 if (write) { 2713 char *kbuf, *p; 2714 2715 if (left > PAGE_SIZE - 1) 2716 left = PAGE_SIZE - 1; 2717 2718 p = kbuf = memdup_user_nul(buffer, left); 2719 if (IS_ERR(kbuf)) 2720 return PTR_ERR(kbuf); 2721 2722 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2723 GFP_KERNEL); 2724 if (!tmp_bitmap) { 2725 kfree(kbuf); 2726 return -ENOMEM; 2727 } 2728 proc_skip_char(&p, &left, '\n'); 2729 while (!err && left) { 2730 unsigned long val_a, val_b; 2731 bool neg; 2732 2733 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 2734 sizeof(tr_a), &c); 2735 if (err) 2736 break; 2737 if (val_a >= bitmap_len || neg) { 2738 err = -EINVAL; 2739 break; 2740 } 2741 2742 val_b = val_a; 2743 if (left) { 2744 p++; 2745 left--; 2746 } 2747 2748 if (c == '-') { 2749 err = proc_get_long(&p, &left, &val_b, 2750 &neg, tr_b, sizeof(tr_b), 2751 &c); 2752 if (err) 2753 break; 2754 if (val_b >= bitmap_len || neg || 2755 val_a > val_b) { 2756 err = -EINVAL; 2757 break; 2758 } 2759 if (left) { 2760 p++; 2761 left--; 2762 } 2763 } 2764 2765 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2766 first = 0; 2767 proc_skip_char(&p, &left, '\n'); 2768 } 2769 kfree(kbuf); 2770 } else { 2771 unsigned long bit_a, bit_b = 0; 2772 2773 while (left) { 2774 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2775 if (bit_a >= bitmap_len) 2776 break; 2777 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2778 bit_a + 1) - 1; 2779 2780 if (!first) { 2781 err = proc_put_char(&buffer, &left, ','); 2782 if (err) 2783 break; 2784 } 2785 err = proc_put_long(&buffer, &left, bit_a, false); 2786 if (err) 2787 break; 2788 if (bit_a != bit_b) { 2789 err = proc_put_char(&buffer, &left, '-'); 2790 if (err) 2791 break; 2792 err = proc_put_long(&buffer, &left, bit_b, false); 2793 if (err) 2794 break; 2795 } 2796 2797 first = 0; bit_b++; 2798 } 2799 if (!err) 2800 err = proc_put_char(&buffer, &left, '\n'); 2801 } 2802 2803 if (!err) { 2804 if (write) { 2805 if (*ppos) 2806 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2807 else 2808 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2809 } 2810 kfree(tmp_bitmap); 2811 *lenp -= left; 2812 *ppos += *lenp; 2813 return 0; 2814 } else { 2815 kfree(tmp_bitmap); 2816 return err; 2817 } 2818 } 2819 2820 #else /* CONFIG_PROC_SYSCTL */ 2821 2822 int proc_dostring(struct ctl_table *table, int write, 2823 void __user *buffer, size_t *lenp, loff_t *ppos) 2824 { 2825 return -ENOSYS; 2826 } 2827 2828 int proc_dointvec(struct ctl_table *table, int write, 2829 void __user *buffer, size_t *lenp, loff_t *ppos) 2830 { 2831 return -ENOSYS; 2832 } 2833 2834 int proc_dointvec_minmax(struct ctl_table *table, int write, 2835 void __user *buffer, size_t *lenp, loff_t *ppos) 2836 { 2837 return -ENOSYS; 2838 } 2839 2840 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2841 void __user *buffer, size_t *lenp, loff_t *ppos) 2842 { 2843 return -ENOSYS; 2844 } 2845 2846 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2847 void __user *buffer, size_t *lenp, loff_t *ppos) 2848 { 2849 return -ENOSYS; 2850 } 2851 2852 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2853 void __user *buffer, size_t *lenp, loff_t *ppos) 2854 { 2855 return -ENOSYS; 2856 } 2857 2858 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2859 void __user *buffer, size_t *lenp, loff_t *ppos) 2860 { 2861 return -ENOSYS; 2862 } 2863 2864 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2865 void __user *buffer, 2866 size_t *lenp, loff_t *ppos) 2867 { 2868 return -ENOSYS; 2869 } 2870 2871 2872 #endif /* CONFIG_PROC_SYSCTL */ 2873 2874 /* 2875 * No sense putting this after each symbol definition, twice, 2876 * exception granted :-) 2877 */ 2878 EXPORT_SYMBOL(proc_dointvec); 2879 EXPORT_SYMBOL(proc_dointvec_jiffies); 2880 EXPORT_SYMBOL(proc_dointvec_minmax); 2881 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2882 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2883 EXPORT_SYMBOL(proc_dostring); 2884 EXPORT_SYMBOL(proc_doulongvec_minmax); 2885 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2886