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