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/mm.h> 23 #include <linux/swap.h> 24 #include <linux/slab.h> 25 #include <linux/sysctl.h> 26 #include <linux/bitmap.h> 27 #include <linux/signal.h> 28 #include <linux/printk.h> 29 #include <linux/proc_fs.h> 30 #include <linux/security.h> 31 #include <linux/ctype.h> 32 #include <linux/kmemcheck.h> 33 #include <linux/kmemleak.h> 34 #include <linux/fs.h> 35 #include <linux/init.h> 36 #include <linux/kernel.h> 37 #include <linux/kobject.h> 38 #include <linux/net.h> 39 #include <linux/sysrq.h> 40 #include <linux/highuid.h> 41 #include <linux/writeback.h> 42 #include <linux/ratelimit.h> 43 #include <linux/compaction.h> 44 #include <linux/hugetlb.h> 45 #include <linux/initrd.h> 46 #include <linux/key.h> 47 #include <linux/times.h> 48 #include <linux/limits.h> 49 #include <linux/dcache.h> 50 #include <linux/dnotify.h> 51 #include <linux/syscalls.h> 52 #include <linux/vmstat.h> 53 #include <linux/nfs_fs.h> 54 #include <linux/acpi.h> 55 #include <linux/reboot.h> 56 #include <linux/ftrace.h> 57 #include <linux/perf_event.h> 58 #include <linux/kprobes.h> 59 #include <linux/pipe_fs_i.h> 60 #include <linux/oom.h> 61 #include <linux/kmod.h> 62 #include <linux/capability.h> 63 #include <linux/binfmts.h> 64 #include <linux/sched/sysctl.h> 65 #include <linux/kexec.h> 66 67 #include <asm/uaccess.h> 68 #include <asm/processor.h> 69 70 #ifdef CONFIG_X86 71 #include <asm/nmi.h> 72 #include <asm/stacktrace.h> 73 #include <asm/io.h> 74 #endif 75 #ifdef CONFIG_SPARC 76 #include <asm/setup.h> 77 #endif 78 #ifdef CONFIG_BSD_PROCESS_ACCT 79 #include <linux/acct.h> 80 #endif 81 #ifdef CONFIG_RT_MUTEXES 82 #include <linux/rtmutex.h> 83 #endif 84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 85 #include <linux/lockdep.h> 86 #endif 87 #ifdef CONFIG_CHR_DEV_SG 88 #include <scsi/sg.h> 89 #endif 90 91 #ifdef CONFIG_LOCKUP_DETECTOR 92 #include <linux/nmi.h> 93 #endif 94 95 96 #if defined(CONFIG_SYSCTL) 97 98 /* External variables not in a header file. */ 99 extern int max_threads; 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 #ifdef CONFIG_PRINTK 130 static int ten_thousand = 10000; 131 #endif 132 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 135 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 137 static int maxolduid = 65535; 138 static int minolduid; 139 140 static int ngroups_max = NGROUPS_MAX; 141 static const int cap_last_cap = CAP_LAST_CAP; 142 143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 144 #ifdef CONFIG_DETECT_HUNG_TASK 145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 146 #endif 147 148 #ifdef CONFIG_INOTIFY_USER 149 #include <linux/inotify.h> 150 #endif 151 #ifdef CONFIG_SPARC 152 #endif 153 154 #ifdef __hppa__ 155 extern int pwrsw_enabled; 156 #endif 157 158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 159 extern int unaligned_enabled; 160 #endif 161 162 #ifdef CONFIG_IA64 163 extern int unaligned_dump_stack; 164 #endif 165 166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 167 extern int no_unaligned_warning; 168 #endif 169 170 #ifdef CONFIG_PROC_SYSCTL 171 172 #define SYSCTL_WRITES_LEGACY -1 173 #define SYSCTL_WRITES_WARN 0 174 #define SYSCTL_WRITES_STRICT 1 175 176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN; 177 178 static int proc_do_cad_pid(struct ctl_table *table, int write, 179 void __user *buffer, size_t *lenp, loff_t *ppos); 180 static int proc_taint(struct ctl_table *table, int write, 181 void __user *buffer, size_t *lenp, loff_t *ppos); 182 #endif 183 184 #ifdef CONFIG_PRINTK 185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 186 void __user *buffer, size_t *lenp, loff_t *ppos); 187 #endif 188 189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 190 void __user *buffer, size_t *lenp, loff_t *ppos); 191 #ifdef CONFIG_COREDUMP 192 static int proc_dostring_coredump(struct ctl_table *table, int write, 193 void __user *buffer, size_t *lenp, loff_t *ppos); 194 #endif 195 196 #ifdef CONFIG_MAGIC_SYSRQ 197 /* Note: sysrq code uses it's own private copy */ 198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 199 200 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 201 void __user *buffer, size_t *lenp, 202 loff_t *ppos) 203 { 204 int error; 205 206 error = proc_dointvec(table, write, buffer, lenp, ppos); 207 if (error) 208 return error; 209 210 if (write) 211 sysrq_toggle_support(__sysrq_enabled); 212 213 return 0; 214 } 215 216 #endif 217 218 static struct ctl_table kern_table[]; 219 static struct ctl_table vm_table[]; 220 static struct ctl_table fs_table[]; 221 static struct ctl_table debug_table[]; 222 static struct ctl_table dev_table[]; 223 extern struct ctl_table random_table[]; 224 #ifdef CONFIG_EPOLL 225 extern struct ctl_table epoll_table[]; 226 #endif 227 228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 229 int sysctl_legacy_va_layout; 230 #endif 231 232 /* The default sysctl tables: */ 233 234 static struct ctl_table sysctl_base_table[] = { 235 { 236 .procname = "kernel", 237 .mode = 0555, 238 .child = kern_table, 239 }, 240 { 241 .procname = "vm", 242 .mode = 0555, 243 .child = vm_table, 244 }, 245 { 246 .procname = "fs", 247 .mode = 0555, 248 .child = fs_table, 249 }, 250 { 251 .procname = "debug", 252 .mode = 0555, 253 .child = debug_table, 254 }, 255 { 256 .procname = "dev", 257 .mode = 0555, 258 .child = dev_table, 259 }, 260 { } 261 }; 262 263 #ifdef CONFIG_SCHED_DEBUG 264 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 265 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 266 static int min_wakeup_granularity_ns; /* 0 usecs */ 267 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 268 #ifdef CONFIG_SMP 269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 271 #endif /* CONFIG_SMP */ 272 #endif /* CONFIG_SCHED_DEBUG */ 273 274 #ifdef CONFIG_COMPACTION 275 static int min_extfrag_threshold; 276 static int max_extfrag_threshold = 1000; 277 #endif 278 279 static struct ctl_table kern_table[] = { 280 { 281 .procname = "sched_child_runs_first", 282 .data = &sysctl_sched_child_runs_first, 283 .maxlen = sizeof(unsigned int), 284 .mode = 0644, 285 .proc_handler = proc_dointvec, 286 }, 287 #ifdef CONFIG_SCHED_DEBUG 288 { 289 .procname = "sched_min_granularity_ns", 290 .data = &sysctl_sched_min_granularity, 291 .maxlen = sizeof(unsigned int), 292 .mode = 0644, 293 .proc_handler = sched_proc_update_handler, 294 .extra1 = &min_sched_granularity_ns, 295 .extra2 = &max_sched_granularity_ns, 296 }, 297 { 298 .procname = "sched_latency_ns", 299 .data = &sysctl_sched_latency, 300 .maxlen = sizeof(unsigned int), 301 .mode = 0644, 302 .proc_handler = sched_proc_update_handler, 303 .extra1 = &min_sched_granularity_ns, 304 .extra2 = &max_sched_granularity_ns, 305 }, 306 { 307 .procname = "sched_wakeup_granularity_ns", 308 .data = &sysctl_sched_wakeup_granularity, 309 .maxlen = sizeof(unsigned int), 310 .mode = 0644, 311 .proc_handler = sched_proc_update_handler, 312 .extra1 = &min_wakeup_granularity_ns, 313 .extra2 = &max_wakeup_granularity_ns, 314 }, 315 #ifdef CONFIG_SMP 316 { 317 .procname = "sched_tunable_scaling", 318 .data = &sysctl_sched_tunable_scaling, 319 .maxlen = sizeof(enum sched_tunable_scaling), 320 .mode = 0644, 321 .proc_handler = sched_proc_update_handler, 322 .extra1 = &min_sched_tunable_scaling, 323 .extra2 = &max_sched_tunable_scaling, 324 }, 325 { 326 .procname = "sched_migration_cost_ns", 327 .data = &sysctl_sched_migration_cost, 328 .maxlen = sizeof(unsigned int), 329 .mode = 0644, 330 .proc_handler = proc_dointvec, 331 }, 332 { 333 .procname = "sched_nr_migrate", 334 .data = &sysctl_sched_nr_migrate, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = proc_dointvec, 338 }, 339 { 340 .procname = "sched_time_avg_ms", 341 .data = &sysctl_sched_time_avg, 342 .maxlen = sizeof(unsigned int), 343 .mode = 0644, 344 .proc_handler = proc_dointvec, 345 }, 346 { 347 .procname = "sched_shares_window_ns", 348 .data = &sysctl_sched_shares_window, 349 .maxlen = sizeof(unsigned int), 350 .mode = 0644, 351 .proc_handler = proc_dointvec, 352 }, 353 { 354 .procname = "timer_migration", 355 .data = &sysctl_timer_migration, 356 .maxlen = sizeof(unsigned int), 357 .mode = 0644, 358 .proc_handler = proc_dointvec_minmax, 359 .extra1 = &zero, 360 .extra2 = &one, 361 }, 362 #endif /* CONFIG_SMP */ 363 #ifdef CONFIG_NUMA_BALANCING 364 { 365 .procname = "numa_balancing_scan_delay_ms", 366 .data = &sysctl_numa_balancing_scan_delay, 367 .maxlen = sizeof(unsigned int), 368 .mode = 0644, 369 .proc_handler = proc_dointvec, 370 }, 371 { 372 .procname = "numa_balancing_scan_period_min_ms", 373 .data = &sysctl_numa_balancing_scan_period_min, 374 .maxlen = sizeof(unsigned int), 375 .mode = 0644, 376 .proc_handler = proc_dointvec, 377 }, 378 { 379 .procname = "numa_balancing_scan_period_max_ms", 380 .data = &sysctl_numa_balancing_scan_period_max, 381 .maxlen = sizeof(unsigned int), 382 .mode = 0644, 383 .proc_handler = proc_dointvec, 384 }, 385 { 386 .procname = "numa_balancing_scan_size_mb", 387 .data = &sysctl_numa_balancing_scan_size, 388 .maxlen = sizeof(unsigned int), 389 .mode = 0644, 390 .proc_handler = proc_dointvec, 391 }, 392 { 393 .procname = "numa_balancing", 394 .data = NULL, /* filled in by handler */ 395 .maxlen = sizeof(unsigned int), 396 .mode = 0644, 397 .proc_handler = sysctl_numa_balancing, 398 .extra1 = &zero, 399 .extra2 = &one, 400 }, 401 #endif /* CONFIG_NUMA_BALANCING */ 402 #endif /* CONFIG_SCHED_DEBUG */ 403 { 404 .procname = "sched_rt_period_us", 405 .data = &sysctl_sched_rt_period, 406 .maxlen = sizeof(unsigned int), 407 .mode = 0644, 408 .proc_handler = sched_rt_handler, 409 }, 410 { 411 .procname = "sched_rt_runtime_us", 412 .data = &sysctl_sched_rt_runtime, 413 .maxlen = sizeof(int), 414 .mode = 0644, 415 .proc_handler = sched_rt_handler, 416 }, 417 { 418 .procname = "sched_rr_timeslice_ms", 419 .data = &sched_rr_timeslice, 420 .maxlen = sizeof(int), 421 .mode = 0644, 422 .proc_handler = sched_rr_handler, 423 }, 424 #ifdef CONFIG_SCHED_AUTOGROUP 425 { 426 .procname = "sched_autogroup_enabled", 427 .data = &sysctl_sched_autogroup_enabled, 428 .maxlen = sizeof(unsigned int), 429 .mode = 0644, 430 .proc_handler = proc_dointvec_minmax, 431 .extra1 = &zero, 432 .extra2 = &one, 433 }, 434 #endif 435 #ifdef CONFIG_CFS_BANDWIDTH 436 { 437 .procname = "sched_cfs_bandwidth_slice_us", 438 .data = &sysctl_sched_cfs_bandwidth_slice, 439 .maxlen = sizeof(unsigned int), 440 .mode = 0644, 441 .proc_handler = proc_dointvec_minmax, 442 .extra1 = &one, 443 }, 444 #endif 445 #ifdef CONFIG_PROVE_LOCKING 446 { 447 .procname = "prove_locking", 448 .data = &prove_locking, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = proc_dointvec, 452 }, 453 #endif 454 #ifdef CONFIG_LOCK_STAT 455 { 456 .procname = "lock_stat", 457 .data = &lock_stat, 458 .maxlen = sizeof(int), 459 .mode = 0644, 460 .proc_handler = proc_dointvec, 461 }, 462 #endif 463 { 464 .procname = "panic", 465 .data = &panic_timeout, 466 .maxlen = sizeof(int), 467 .mode = 0644, 468 .proc_handler = proc_dointvec, 469 }, 470 #ifdef CONFIG_COREDUMP 471 { 472 .procname = "core_uses_pid", 473 .data = &core_uses_pid, 474 .maxlen = sizeof(int), 475 .mode = 0644, 476 .proc_handler = proc_dointvec, 477 }, 478 { 479 .procname = "core_pattern", 480 .data = core_pattern, 481 .maxlen = CORENAME_MAX_SIZE, 482 .mode = 0644, 483 .proc_handler = proc_dostring_coredump, 484 }, 485 { 486 .procname = "core_pipe_limit", 487 .data = &core_pipe_limit, 488 .maxlen = sizeof(unsigned int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec, 491 }, 492 #endif 493 #ifdef CONFIG_PROC_SYSCTL 494 { 495 .procname = "tainted", 496 .maxlen = sizeof(long), 497 .mode = 0644, 498 .proc_handler = proc_taint, 499 }, 500 { 501 .procname = "sysctl_writes_strict", 502 .data = &sysctl_writes_strict, 503 .maxlen = sizeof(int), 504 .mode = 0644, 505 .proc_handler = proc_dointvec_minmax, 506 .extra1 = &neg_one, 507 .extra2 = &one, 508 }, 509 #endif 510 #ifdef CONFIG_LATENCYTOP 511 { 512 .procname = "latencytop", 513 .data = &latencytop_enabled, 514 .maxlen = sizeof(int), 515 .mode = 0644, 516 .proc_handler = proc_dointvec, 517 }, 518 #endif 519 #ifdef CONFIG_BLK_DEV_INITRD 520 { 521 .procname = "real-root-dev", 522 .data = &real_root_dev, 523 .maxlen = sizeof(int), 524 .mode = 0644, 525 .proc_handler = proc_dointvec, 526 }, 527 #endif 528 { 529 .procname = "print-fatal-signals", 530 .data = &print_fatal_signals, 531 .maxlen = sizeof(int), 532 .mode = 0644, 533 .proc_handler = proc_dointvec, 534 }, 535 #ifdef CONFIG_SPARC 536 { 537 .procname = "reboot-cmd", 538 .data = reboot_command, 539 .maxlen = 256, 540 .mode = 0644, 541 .proc_handler = proc_dostring, 542 }, 543 { 544 .procname = "stop-a", 545 .data = &stop_a_enabled, 546 .maxlen = sizeof (int), 547 .mode = 0644, 548 .proc_handler = proc_dointvec, 549 }, 550 { 551 .procname = "scons-poweroff", 552 .data = &scons_pwroff, 553 .maxlen = sizeof (int), 554 .mode = 0644, 555 .proc_handler = proc_dointvec, 556 }, 557 #endif 558 #ifdef CONFIG_SPARC64 559 { 560 .procname = "tsb-ratio", 561 .data = &sysctl_tsb_ratio, 562 .maxlen = sizeof (int), 563 .mode = 0644, 564 .proc_handler = proc_dointvec, 565 }, 566 #endif 567 #ifdef __hppa__ 568 { 569 .procname = "soft-power", 570 .data = &pwrsw_enabled, 571 .maxlen = sizeof (int), 572 .mode = 0644, 573 .proc_handler = proc_dointvec, 574 }, 575 #endif 576 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 577 { 578 .procname = "unaligned-trap", 579 .data = &unaligned_enabled, 580 .maxlen = sizeof (int), 581 .mode = 0644, 582 .proc_handler = proc_dointvec, 583 }, 584 #endif 585 { 586 .procname = "ctrl-alt-del", 587 .data = &C_A_D, 588 .maxlen = sizeof(int), 589 .mode = 0644, 590 .proc_handler = proc_dointvec, 591 }, 592 #ifdef CONFIG_FUNCTION_TRACER 593 { 594 .procname = "ftrace_enabled", 595 .data = &ftrace_enabled, 596 .maxlen = sizeof(int), 597 .mode = 0644, 598 .proc_handler = ftrace_enable_sysctl, 599 }, 600 #endif 601 #ifdef CONFIG_STACK_TRACER 602 { 603 .procname = "stack_tracer_enabled", 604 .data = &stack_tracer_enabled, 605 .maxlen = sizeof(int), 606 .mode = 0644, 607 .proc_handler = stack_trace_sysctl, 608 }, 609 #endif 610 #ifdef CONFIG_TRACING 611 { 612 .procname = "ftrace_dump_on_oops", 613 .data = &ftrace_dump_on_oops, 614 .maxlen = sizeof(int), 615 .mode = 0644, 616 .proc_handler = proc_dointvec, 617 }, 618 { 619 .procname = "traceoff_on_warning", 620 .data = &__disable_trace_on_warning, 621 .maxlen = sizeof(__disable_trace_on_warning), 622 .mode = 0644, 623 .proc_handler = proc_dointvec, 624 }, 625 #endif 626 #ifdef CONFIG_KEXEC 627 { 628 .procname = "kexec_load_disabled", 629 .data = &kexec_load_disabled, 630 .maxlen = sizeof(int), 631 .mode = 0644, 632 /* only handle a transition from default "0" to "1" */ 633 .proc_handler = proc_dointvec_minmax, 634 .extra1 = &one, 635 .extra2 = &one, 636 }, 637 #endif 638 #ifdef CONFIG_MODULES 639 { 640 .procname = "modprobe", 641 .data = &modprobe_path, 642 .maxlen = KMOD_PATH_LEN, 643 .mode = 0644, 644 .proc_handler = proc_dostring, 645 }, 646 { 647 .procname = "modules_disabled", 648 .data = &modules_disabled, 649 .maxlen = sizeof(int), 650 .mode = 0644, 651 /* only handle a transition from default "0" to "1" */ 652 .proc_handler = proc_dointvec_minmax, 653 .extra1 = &one, 654 .extra2 = &one, 655 }, 656 #endif 657 #ifdef CONFIG_UEVENT_HELPER 658 { 659 .procname = "hotplug", 660 .data = &uevent_helper, 661 .maxlen = UEVENT_HELPER_PATH_LEN, 662 .mode = 0644, 663 .proc_handler = proc_dostring, 664 }, 665 #endif 666 #ifdef CONFIG_CHR_DEV_SG 667 { 668 .procname = "sg-big-buff", 669 .data = &sg_big_buff, 670 .maxlen = sizeof (int), 671 .mode = 0444, 672 .proc_handler = proc_dointvec, 673 }, 674 #endif 675 #ifdef CONFIG_BSD_PROCESS_ACCT 676 { 677 .procname = "acct", 678 .data = &acct_parm, 679 .maxlen = 3*sizeof(int), 680 .mode = 0644, 681 .proc_handler = proc_dointvec, 682 }, 683 #endif 684 #ifdef CONFIG_MAGIC_SYSRQ 685 { 686 .procname = "sysrq", 687 .data = &__sysrq_enabled, 688 .maxlen = sizeof (int), 689 .mode = 0644, 690 .proc_handler = sysrq_sysctl_handler, 691 }, 692 #endif 693 #ifdef CONFIG_PROC_SYSCTL 694 { 695 .procname = "cad_pid", 696 .data = NULL, 697 .maxlen = sizeof (int), 698 .mode = 0600, 699 .proc_handler = proc_do_cad_pid, 700 }, 701 #endif 702 { 703 .procname = "threads-max", 704 .data = &max_threads, 705 .maxlen = sizeof(int), 706 .mode = 0644, 707 .proc_handler = proc_dointvec, 708 }, 709 { 710 .procname = "random", 711 .mode = 0555, 712 .child = random_table, 713 }, 714 { 715 .procname = "usermodehelper", 716 .mode = 0555, 717 .child = usermodehelper_table, 718 }, 719 { 720 .procname = "overflowuid", 721 .data = &overflowuid, 722 .maxlen = sizeof(int), 723 .mode = 0644, 724 .proc_handler = proc_dointvec_minmax, 725 .extra1 = &minolduid, 726 .extra2 = &maxolduid, 727 }, 728 { 729 .procname = "overflowgid", 730 .data = &overflowgid, 731 .maxlen = sizeof(int), 732 .mode = 0644, 733 .proc_handler = proc_dointvec_minmax, 734 .extra1 = &minolduid, 735 .extra2 = &maxolduid, 736 }, 737 #ifdef CONFIG_S390 738 #ifdef CONFIG_MATHEMU 739 { 740 .procname = "ieee_emulation_warnings", 741 .data = &sysctl_ieee_emulation_warnings, 742 .maxlen = sizeof(int), 743 .mode = 0644, 744 .proc_handler = proc_dointvec, 745 }, 746 #endif 747 { 748 .procname = "userprocess_debug", 749 .data = &show_unhandled_signals, 750 .maxlen = sizeof(int), 751 .mode = 0644, 752 .proc_handler = proc_dointvec, 753 }, 754 #endif 755 { 756 .procname = "pid_max", 757 .data = &pid_max, 758 .maxlen = sizeof (int), 759 .mode = 0644, 760 .proc_handler = proc_dointvec_minmax, 761 .extra1 = &pid_max_min, 762 .extra2 = &pid_max_max, 763 }, 764 { 765 .procname = "panic_on_oops", 766 .data = &panic_on_oops, 767 .maxlen = sizeof(int), 768 .mode = 0644, 769 .proc_handler = proc_dointvec, 770 }, 771 #if defined CONFIG_PRINTK 772 { 773 .procname = "printk", 774 .data = &console_loglevel, 775 .maxlen = 4*sizeof(int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 { 780 .procname = "printk_ratelimit", 781 .data = &printk_ratelimit_state.interval, 782 .maxlen = sizeof(int), 783 .mode = 0644, 784 .proc_handler = proc_dointvec_jiffies, 785 }, 786 { 787 .procname = "printk_ratelimit_burst", 788 .data = &printk_ratelimit_state.burst, 789 .maxlen = sizeof(int), 790 .mode = 0644, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "printk_delay", 795 .data = &printk_delay_msec, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec_minmax, 799 .extra1 = &zero, 800 .extra2 = &ten_thousand, 801 }, 802 { 803 .procname = "dmesg_restrict", 804 .data = &dmesg_restrict, 805 .maxlen = sizeof(int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec_minmax_sysadmin, 808 .extra1 = &zero, 809 .extra2 = &one, 810 }, 811 { 812 .procname = "kptr_restrict", 813 .data = &kptr_restrict, 814 .maxlen = sizeof(int), 815 .mode = 0644, 816 .proc_handler = proc_dointvec_minmax_sysadmin, 817 .extra1 = &zero, 818 .extra2 = &two, 819 }, 820 #endif 821 { 822 .procname = "ngroups_max", 823 .data = &ngroups_max, 824 .maxlen = sizeof (int), 825 .mode = 0444, 826 .proc_handler = proc_dointvec, 827 }, 828 { 829 .procname = "cap_last_cap", 830 .data = (void *)&cap_last_cap, 831 .maxlen = sizeof(int), 832 .mode = 0444, 833 .proc_handler = proc_dointvec, 834 }, 835 #if defined(CONFIG_LOCKUP_DETECTOR) 836 { 837 .procname = "watchdog", 838 .data = &watchdog_user_enabled, 839 .maxlen = sizeof (int), 840 .mode = 0644, 841 .proc_handler = proc_dowatchdog, 842 .extra1 = &zero, 843 .extra2 = &one, 844 }, 845 { 846 .procname = "watchdog_thresh", 847 .data = &watchdog_thresh, 848 .maxlen = sizeof(int), 849 .mode = 0644, 850 .proc_handler = proc_dowatchdog, 851 .extra1 = &zero, 852 .extra2 = &sixty, 853 }, 854 { 855 .procname = "softlockup_panic", 856 .data = &softlockup_panic, 857 .maxlen = sizeof(int), 858 .mode = 0644, 859 .proc_handler = proc_dointvec_minmax, 860 .extra1 = &zero, 861 .extra2 = &one, 862 }, 863 #ifdef CONFIG_SMP 864 { 865 .procname = "softlockup_all_cpu_backtrace", 866 .data = &sysctl_softlockup_all_cpu_backtrace, 867 .maxlen = sizeof(int), 868 .mode = 0644, 869 .proc_handler = proc_dointvec_minmax, 870 .extra1 = &zero, 871 .extra2 = &one, 872 }, 873 #endif /* CONFIG_SMP */ 874 { 875 .procname = "nmi_watchdog", 876 .data = &watchdog_user_enabled, 877 .maxlen = sizeof (int), 878 .mode = 0644, 879 .proc_handler = proc_dowatchdog, 880 .extra1 = &zero, 881 .extra2 = &one, 882 }, 883 #endif 884 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 885 { 886 .procname = "unknown_nmi_panic", 887 .data = &unknown_nmi_panic, 888 .maxlen = sizeof (int), 889 .mode = 0644, 890 .proc_handler = proc_dointvec, 891 }, 892 #endif 893 #if defined(CONFIG_X86) 894 { 895 .procname = "panic_on_unrecovered_nmi", 896 .data = &panic_on_unrecovered_nmi, 897 .maxlen = sizeof(int), 898 .mode = 0644, 899 .proc_handler = proc_dointvec, 900 }, 901 { 902 .procname = "panic_on_io_nmi", 903 .data = &panic_on_io_nmi, 904 .maxlen = sizeof(int), 905 .mode = 0644, 906 .proc_handler = proc_dointvec, 907 }, 908 #ifdef CONFIG_DEBUG_STACKOVERFLOW 909 { 910 .procname = "panic_on_stackoverflow", 911 .data = &sysctl_panic_on_stackoverflow, 912 .maxlen = sizeof(int), 913 .mode = 0644, 914 .proc_handler = proc_dointvec, 915 }, 916 #endif 917 { 918 .procname = "bootloader_type", 919 .data = &bootloader_type, 920 .maxlen = sizeof (int), 921 .mode = 0444, 922 .proc_handler = proc_dointvec, 923 }, 924 { 925 .procname = "bootloader_version", 926 .data = &bootloader_version, 927 .maxlen = sizeof (int), 928 .mode = 0444, 929 .proc_handler = proc_dointvec, 930 }, 931 { 932 .procname = "kstack_depth_to_print", 933 .data = &kstack_depth_to_print, 934 .maxlen = sizeof(int), 935 .mode = 0644, 936 .proc_handler = proc_dointvec, 937 }, 938 { 939 .procname = "io_delay_type", 940 .data = &io_delay_type, 941 .maxlen = sizeof(int), 942 .mode = 0644, 943 .proc_handler = proc_dointvec, 944 }, 945 #endif 946 #if defined(CONFIG_MMU) 947 { 948 .procname = "randomize_va_space", 949 .data = &randomize_va_space, 950 .maxlen = sizeof(int), 951 .mode = 0644, 952 .proc_handler = proc_dointvec, 953 }, 954 #endif 955 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 956 { 957 .procname = "spin_retry", 958 .data = &spin_retry, 959 .maxlen = sizeof (int), 960 .mode = 0644, 961 .proc_handler = proc_dointvec, 962 }, 963 #endif 964 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 965 { 966 .procname = "acpi_video_flags", 967 .data = &acpi_realmode_flags, 968 .maxlen = sizeof (unsigned long), 969 .mode = 0644, 970 .proc_handler = proc_doulongvec_minmax, 971 }, 972 #endif 973 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 974 { 975 .procname = "ignore-unaligned-usertrap", 976 .data = &no_unaligned_warning, 977 .maxlen = sizeof (int), 978 .mode = 0644, 979 .proc_handler = proc_dointvec, 980 }, 981 #endif 982 #ifdef CONFIG_IA64 983 { 984 .procname = "unaligned-dump-stack", 985 .data = &unaligned_dump_stack, 986 .maxlen = sizeof (int), 987 .mode = 0644, 988 .proc_handler = proc_dointvec, 989 }, 990 #endif 991 #ifdef CONFIG_DETECT_HUNG_TASK 992 { 993 .procname = "hung_task_panic", 994 .data = &sysctl_hung_task_panic, 995 .maxlen = sizeof(int), 996 .mode = 0644, 997 .proc_handler = proc_dointvec_minmax, 998 .extra1 = &zero, 999 .extra2 = &one, 1000 }, 1001 { 1002 .procname = "hung_task_check_count", 1003 .data = &sysctl_hung_task_check_count, 1004 .maxlen = sizeof(int), 1005 .mode = 0644, 1006 .proc_handler = proc_dointvec_minmax, 1007 .extra1 = &zero, 1008 }, 1009 { 1010 .procname = "hung_task_timeout_secs", 1011 .data = &sysctl_hung_task_timeout_secs, 1012 .maxlen = sizeof(unsigned long), 1013 .mode = 0644, 1014 .proc_handler = proc_dohung_task_timeout_secs, 1015 .extra2 = &hung_task_timeout_max, 1016 }, 1017 { 1018 .procname = "hung_task_warnings", 1019 .data = &sysctl_hung_task_warnings, 1020 .maxlen = sizeof(int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec_minmax, 1023 .extra1 = &neg_one, 1024 }, 1025 #endif 1026 #ifdef CONFIG_COMPAT 1027 { 1028 .procname = "compat-log", 1029 .data = &compat_log, 1030 .maxlen = sizeof (int), 1031 .mode = 0644, 1032 .proc_handler = proc_dointvec, 1033 }, 1034 #endif 1035 #ifdef CONFIG_RT_MUTEXES 1036 { 1037 .procname = "max_lock_depth", 1038 .data = &max_lock_depth, 1039 .maxlen = sizeof(int), 1040 .mode = 0644, 1041 .proc_handler = proc_dointvec, 1042 }, 1043 #endif 1044 { 1045 .procname = "poweroff_cmd", 1046 .data = &poweroff_cmd, 1047 .maxlen = POWEROFF_CMD_PATH_LEN, 1048 .mode = 0644, 1049 .proc_handler = proc_dostring, 1050 }, 1051 #ifdef CONFIG_KEYS 1052 { 1053 .procname = "keys", 1054 .mode = 0555, 1055 .child = key_sysctls, 1056 }, 1057 #endif 1058 #ifdef CONFIG_RCU_TORTURE_TEST 1059 { 1060 .procname = "rcutorture_runnable", 1061 .data = &rcutorture_runnable, 1062 .maxlen = sizeof(int), 1063 .mode = 0644, 1064 .proc_handler = proc_dointvec, 1065 }, 1066 #endif 1067 #ifdef CONFIG_PERF_EVENTS 1068 /* 1069 * User-space scripts rely on the existence of this file 1070 * as a feature check for perf_events being enabled. 1071 * 1072 * So it's an ABI, do not remove! 1073 */ 1074 { 1075 .procname = "perf_event_paranoid", 1076 .data = &sysctl_perf_event_paranoid, 1077 .maxlen = sizeof(sysctl_perf_event_paranoid), 1078 .mode = 0644, 1079 .proc_handler = proc_dointvec, 1080 }, 1081 { 1082 .procname = "perf_event_mlock_kb", 1083 .data = &sysctl_perf_event_mlock, 1084 .maxlen = sizeof(sysctl_perf_event_mlock), 1085 .mode = 0644, 1086 .proc_handler = proc_dointvec, 1087 }, 1088 { 1089 .procname = "perf_event_max_sample_rate", 1090 .data = &sysctl_perf_event_sample_rate, 1091 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1092 .mode = 0644, 1093 .proc_handler = perf_proc_update_handler, 1094 .extra1 = &one, 1095 }, 1096 { 1097 .procname = "perf_cpu_time_max_percent", 1098 .data = &sysctl_perf_cpu_time_max_percent, 1099 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1100 .mode = 0644, 1101 .proc_handler = perf_cpu_time_max_percent_handler, 1102 .extra1 = &zero, 1103 .extra2 = &one_hundred, 1104 }, 1105 #endif 1106 #ifdef CONFIG_KMEMCHECK 1107 { 1108 .procname = "kmemcheck", 1109 .data = &kmemcheck_enabled, 1110 .maxlen = sizeof(int), 1111 .mode = 0644, 1112 .proc_handler = proc_dointvec, 1113 }, 1114 #endif 1115 { } 1116 }; 1117 1118 static struct ctl_table vm_table[] = { 1119 { 1120 .procname = "overcommit_memory", 1121 .data = &sysctl_overcommit_memory, 1122 .maxlen = sizeof(sysctl_overcommit_memory), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec_minmax, 1125 .extra1 = &zero, 1126 .extra2 = &two, 1127 }, 1128 { 1129 .procname = "panic_on_oom", 1130 .data = &sysctl_panic_on_oom, 1131 .maxlen = sizeof(sysctl_panic_on_oom), 1132 .mode = 0644, 1133 .proc_handler = proc_dointvec_minmax, 1134 .extra1 = &zero, 1135 .extra2 = &two, 1136 }, 1137 { 1138 .procname = "oom_kill_allocating_task", 1139 .data = &sysctl_oom_kill_allocating_task, 1140 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1141 .mode = 0644, 1142 .proc_handler = proc_dointvec, 1143 }, 1144 { 1145 .procname = "oom_dump_tasks", 1146 .data = &sysctl_oom_dump_tasks, 1147 .maxlen = sizeof(sysctl_oom_dump_tasks), 1148 .mode = 0644, 1149 .proc_handler = proc_dointvec, 1150 }, 1151 { 1152 .procname = "overcommit_ratio", 1153 .data = &sysctl_overcommit_ratio, 1154 .maxlen = sizeof(sysctl_overcommit_ratio), 1155 .mode = 0644, 1156 .proc_handler = overcommit_ratio_handler, 1157 }, 1158 { 1159 .procname = "overcommit_kbytes", 1160 .data = &sysctl_overcommit_kbytes, 1161 .maxlen = sizeof(sysctl_overcommit_kbytes), 1162 .mode = 0644, 1163 .proc_handler = overcommit_kbytes_handler, 1164 }, 1165 { 1166 .procname = "page-cluster", 1167 .data = &page_cluster, 1168 .maxlen = sizeof(int), 1169 .mode = 0644, 1170 .proc_handler = proc_dointvec_minmax, 1171 .extra1 = &zero, 1172 }, 1173 { 1174 .procname = "dirty_background_ratio", 1175 .data = &dirty_background_ratio, 1176 .maxlen = sizeof(dirty_background_ratio), 1177 .mode = 0644, 1178 .proc_handler = dirty_background_ratio_handler, 1179 .extra1 = &zero, 1180 .extra2 = &one_hundred, 1181 }, 1182 { 1183 .procname = "dirty_background_bytes", 1184 .data = &dirty_background_bytes, 1185 .maxlen = sizeof(dirty_background_bytes), 1186 .mode = 0644, 1187 .proc_handler = dirty_background_bytes_handler, 1188 .extra1 = &one_ul, 1189 }, 1190 { 1191 .procname = "dirty_ratio", 1192 .data = &vm_dirty_ratio, 1193 .maxlen = sizeof(vm_dirty_ratio), 1194 .mode = 0644, 1195 .proc_handler = dirty_ratio_handler, 1196 .extra1 = &zero, 1197 .extra2 = &one_hundred, 1198 }, 1199 { 1200 .procname = "dirty_bytes", 1201 .data = &vm_dirty_bytes, 1202 .maxlen = sizeof(vm_dirty_bytes), 1203 .mode = 0644, 1204 .proc_handler = dirty_bytes_handler, 1205 .extra1 = &dirty_bytes_min, 1206 }, 1207 { 1208 .procname = "dirty_writeback_centisecs", 1209 .data = &dirty_writeback_interval, 1210 .maxlen = sizeof(dirty_writeback_interval), 1211 .mode = 0644, 1212 .proc_handler = dirty_writeback_centisecs_handler, 1213 }, 1214 { 1215 .procname = "dirty_expire_centisecs", 1216 .data = &dirty_expire_interval, 1217 .maxlen = sizeof(dirty_expire_interval), 1218 .mode = 0644, 1219 .proc_handler = proc_dointvec_minmax, 1220 .extra1 = &zero, 1221 }, 1222 { 1223 .procname = "nr_pdflush_threads", 1224 .mode = 0444 /* read-only */, 1225 .proc_handler = pdflush_proc_obsolete, 1226 }, 1227 { 1228 .procname = "swappiness", 1229 .data = &vm_swappiness, 1230 .maxlen = sizeof(vm_swappiness), 1231 .mode = 0644, 1232 .proc_handler = proc_dointvec_minmax, 1233 .extra1 = &zero, 1234 .extra2 = &one_hundred, 1235 }, 1236 #ifdef CONFIG_HUGETLB_PAGE 1237 { 1238 .procname = "nr_hugepages", 1239 .data = NULL, 1240 .maxlen = sizeof(unsigned long), 1241 .mode = 0644, 1242 .proc_handler = hugetlb_sysctl_handler, 1243 .extra1 = &zero, 1244 }, 1245 #ifdef CONFIG_NUMA 1246 { 1247 .procname = "nr_hugepages_mempolicy", 1248 .data = NULL, 1249 .maxlen = sizeof(unsigned long), 1250 .mode = 0644, 1251 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1252 .extra1 = &zero, 1253 }, 1254 #endif 1255 { 1256 .procname = "hugetlb_shm_group", 1257 .data = &sysctl_hugetlb_shm_group, 1258 .maxlen = sizeof(gid_t), 1259 .mode = 0644, 1260 .proc_handler = proc_dointvec, 1261 }, 1262 { 1263 .procname = "hugepages_treat_as_movable", 1264 .data = &hugepages_treat_as_movable, 1265 .maxlen = sizeof(int), 1266 .mode = 0644, 1267 .proc_handler = proc_dointvec, 1268 }, 1269 { 1270 .procname = "nr_overcommit_hugepages", 1271 .data = NULL, 1272 .maxlen = sizeof(unsigned long), 1273 .mode = 0644, 1274 .proc_handler = hugetlb_overcommit_handler, 1275 .extra1 = &zero, 1276 }, 1277 #endif 1278 { 1279 .procname = "lowmem_reserve_ratio", 1280 .data = &sysctl_lowmem_reserve_ratio, 1281 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1282 .mode = 0644, 1283 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1284 }, 1285 { 1286 .procname = "drop_caches", 1287 .data = &sysctl_drop_caches, 1288 .maxlen = sizeof(int), 1289 .mode = 0644, 1290 .proc_handler = drop_caches_sysctl_handler, 1291 .extra1 = &one, 1292 .extra2 = &four, 1293 }, 1294 #ifdef CONFIG_COMPACTION 1295 { 1296 .procname = "compact_memory", 1297 .data = &sysctl_compact_memory, 1298 .maxlen = sizeof(int), 1299 .mode = 0200, 1300 .proc_handler = sysctl_compaction_handler, 1301 }, 1302 { 1303 .procname = "extfrag_threshold", 1304 .data = &sysctl_extfrag_threshold, 1305 .maxlen = sizeof(int), 1306 .mode = 0644, 1307 .proc_handler = sysctl_extfrag_handler, 1308 .extra1 = &min_extfrag_threshold, 1309 .extra2 = &max_extfrag_threshold, 1310 }, 1311 1312 #endif /* CONFIG_COMPACTION */ 1313 { 1314 .procname = "min_free_kbytes", 1315 .data = &min_free_kbytes, 1316 .maxlen = sizeof(min_free_kbytes), 1317 .mode = 0644, 1318 .proc_handler = min_free_kbytes_sysctl_handler, 1319 .extra1 = &zero, 1320 }, 1321 { 1322 .procname = "percpu_pagelist_fraction", 1323 .data = &percpu_pagelist_fraction, 1324 .maxlen = sizeof(percpu_pagelist_fraction), 1325 .mode = 0644, 1326 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1327 .extra1 = &zero, 1328 }, 1329 #ifdef CONFIG_MMU 1330 { 1331 .procname = "max_map_count", 1332 .data = &sysctl_max_map_count, 1333 .maxlen = sizeof(sysctl_max_map_count), 1334 .mode = 0644, 1335 .proc_handler = proc_dointvec_minmax, 1336 .extra1 = &zero, 1337 }, 1338 #else 1339 { 1340 .procname = "nr_trim_pages", 1341 .data = &sysctl_nr_trim_pages, 1342 .maxlen = sizeof(sysctl_nr_trim_pages), 1343 .mode = 0644, 1344 .proc_handler = proc_dointvec_minmax, 1345 .extra1 = &zero, 1346 }, 1347 #endif 1348 { 1349 .procname = "laptop_mode", 1350 .data = &laptop_mode, 1351 .maxlen = sizeof(laptop_mode), 1352 .mode = 0644, 1353 .proc_handler = proc_dointvec_jiffies, 1354 }, 1355 { 1356 .procname = "block_dump", 1357 .data = &block_dump, 1358 .maxlen = sizeof(block_dump), 1359 .mode = 0644, 1360 .proc_handler = proc_dointvec, 1361 .extra1 = &zero, 1362 }, 1363 { 1364 .procname = "vfs_cache_pressure", 1365 .data = &sysctl_vfs_cache_pressure, 1366 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1367 .mode = 0644, 1368 .proc_handler = proc_dointvec, 1369 .extra1 = &zero, 1370 }, 1371 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1372 { 1373 .procname = "legacy_va_layout", 1374 .data = &sysctl_legacy_va_layout, 1375 .maxlen = sizeof(sysctl_legacy_va_layout), 1376 .mode = 0644, 1377 .proc_handler = proc_dointvec, 1378 .extra1 = &zero, 1379 }, 1380 #endif 1381 #ifdef CONFIG_NUMA 1382 { 1383 .procname = "zone_reclaim_mode", 1384 .data = &zone_reclaim_mode, 1385 .maxlen = sizeof(zone_reclaim_mode), 1386 .mode = 0644, 1387 .proc_handler = proc_dointvec, 1388 .extra1 = &zero, 1389 }, 1390 { 1391 .procname = "min_unmapped_ratio", 1392 .data = &sysctl_min_unmapped_ratio, 1393 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1394 .mode = 0644, 1395 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1396 .extra1 = &zero, 1397 .extra2 = &one_hundred, 1398 }, 1399 { 1400 .procname = "min_slab_ratio", 1401 .data = &sysctl_min_slab_ratio, 1402 .maxlen = sizeof(sysctl_min_slab_ratio), 1403 .mode = 0644, 1404 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1405 .extra1 = &zero, 1406 .extra2 = &one_hundred, 1407 }, 1408 #endif 1409 #ifdef CONFIG_SMP 1410 { 1411 .procname = "stat_interval", 1412 .data = &sysctl_stat_interval, 1413 .maxlen = sizeof(sysctl_stat_interval), 1414 .mode = 0644, 1415 .proc_handler = proc_dointvec_jiffies, 1416 }, 1417 #endif 1418 #ifdef CONFIG_MMU 1419 { 1420 .procname = "mmap_min_addr", 1421 .data = &dac_mmap_min_addr, 1422 .maxlen = sizeof(unsigned long), 1423 .mode = 0644, 1424 .proc_handler = mmap_min_addr_handler, 1425 }, 1426 #endif 1427 #ifdef CONFIG_NUMA 1428 { 1429 .procname = "numa_zonelist_order", 1430 .data = &numa_zonelist_order, 1431 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1432 .mode = 0644, 1433 .proc_handler = numa_zonelist_order_handler, 1434 }, 1435 #endif 1436 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1437 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1438 { 1439 .procname = "vdso_enabled", 1440 #ifdef CONFIG_X86_32 1441 .data = &vdso32_enabled, 1442 .maxlen = sizeof(vdso32_enabled), 1443 #else 1444 .data = &vdso_enabled, 1445 .maxlen = sizeof(vdso_enabled), 1446 #endif 1447 .mode = 0644, 1448 .proc_handler = proc_dointvec, 1449 .extra1 = &zero, 1450 }, 1451 #endif 1452 #ifdef CONFIG_HIGHMEM 1453 { 1454 .procname = "highmem_is_dirtyable", 1455 .data = &vm_highmem_is_dirtyable, 1456 .maxlen = sizeof(vm_highmem_is_dirtyable), 1457 .mode = 0644, 1458 .proc_handler = proc_dointvec_minmax, 1459 .extra1 = &zero, 1460 .extra2 = &one, 1461 }, 1462 #endif 1463 { 1464 .procname = "scan_unevictable_pages", 1465 .data = &scan_unevictable_pages, 1466 .maxlen = sizeof(scan_unevictable_pages), 1467 .mode = 0644, 1468 .proc_handler = scan_unevictable_handler, 1469 }, 1470 #ifdef CONFIG_MEMORY_FAILURE 1471 { 1472 .procname = "memory_failure_early_kill", 1473 .data = &sysctl_memory_failure_early_kill, 1474 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1475 .mode = 0644, 1476 .proc_handler = proc_dointvec_minmax, 1477 .extra1 = &zero, 1478 .extra2 = &one, 1479 }, 1480 { 1481 .procname = "memory_failure_recovery", 1482 .data = &sysctl_memory_failure_recovery, 1483 .maxlen = sizeof(sysctl_memory_failure_recovery), 1484 .mode = 0644, 1485 .proc_handler = proc_dointvec_minmax, 1486 .extra1 = &zero, 1487 .extra2 = &one, 1488 }, 1489 #endif 1490 { 1491 .procname = "user_reserve_kbytes", 1492 .data = &sysctl_user_reserve_kbytes, 1493 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1494 .mode = 0644, 1495 .proc_handler = proc_doulongvec_minmax, 1496 }, 1497 { 1498 .procname = "admin_reserve_kbytes", 1499 .data = &sysctl_admin_reserve_kbytes, 1500 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1501 .mode = 0644, 1502 .proc_handler = proc_doulongvec_minmax, 1503 }, 1504 { } 1505 }; 1506 1507 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1508 static struct ctl_table binfmt_misc_table[] = { 1509 { } 1510 }; 1511 #endif 1512 1513 static struct ctl_table fs_table[] = { 1514 { 1515 .procname = "inode-nr", 1516 .data = &inodes_stat, 1517 .maxlen = 2*sizeof(long), 1518 .mode = 0444, 1519 .proc_handler = proc_nr_inodes, 1520 }, 1521 { 1522 .procname = "inode-state", 1523 .data = &inodes_stat, 1524 .maxlen = 7*sizeof(long), 1525 .mode = 0444, 1526 .proc_handler = proc_nr_inodes, 1527 }, 1528 { 1529 .procname = "file-nr", 1530 .data = &files_stat, 1531 .maxlen = sizeof(files_stat), 1532 .mode = 0444, 1533 .proc_handler = proc_nr_files, 1534 }, 1535 { 1536 .procname = "file-max", 1537 .data = &files_stat.max_files, 1538 .maxlen = sizeof(files_stat.max_files), 1539 .mode = 0644, 1540 .proc_handler = proc_doulongvec_minmax, 1541 }, 1542 { 1543 .procname = "nr_open", 1544 .data = &sysctl_nr_open, 1545 .maxlen = sizeof(int), 1546 .mode = 0644, 1547 .proc_handler = proc_dointvec_minmax, 1548 .extra1 = &sysctl_nr_open_min, 1549 .extra2 = &sysctl_nr_open_max, 1550 }, 1551 { 1552 .procname = "dentry-state", 1553 .data = &dentry_stat, 1554 .maxlen = 6*sizeof(long), 1555 .mode = 0444, 1556 .proc_handler = proc_nr_dentry, 1557 }, 1558 { 1559 .procname = "overflowuid", 1560 .data = &fs_overflowuid, 1561 .maxlen = sizeof(int), 1562 .mode = 0644, 1563 .proc_handler = proc_dointvec_minmax, 1564 .extra1 = &minolduid, 1565 .extra2 = &maxolduid, 1566 }, 1567 { 1568 .procname = "overflowgid", 1569 .data = &fs_overflowgid, 1570 .maxlen = sizeof(int), 1571 .mode = 0644, 1572 .proc_handler = proc_dointvec_minmax, 1573 .extra1 = &minolduid, 1574 .extra2 = &maxolduid, 1575 }, 1576 #ifdef CONFIG_FILE_LOCKING 1577 { 1578 .procname = "leases-enable", 1579 .data = &leases_enable, 1580 .maxlen = sizeof(int), 1581 .mode = 0644, 1582 .proc_handler = proc_dointvec, 1583 }, 1584 #endif 1585 #ifdef CONFIG_DNOTIFY 1586 { 1587 .procname = "dir-notify-enable", 1588 .data = &dir_notify_enable, 1589 .maxlen = sizeof(int), 1590 .mode = 0644, 1591 .proc_handler = proc_dointvec, 1592 }, 1593 #endif 1594 #ifdef CONFIG_MMU 1595 #ifdef CONFIG_FILE_LOCKING 1596 { 1597 .procname = "lease-break-time", 1598 .data = &lease_break_time, 1599 .maxlen = sizeof(int), 1600 .mode = 0644, 1601 .proc_handler = proc_dointvec, 1602 }, 1603 #endif 1604 #ifdef CONFIG_AIO 1605 { 1606 .procname = "aio-nr", 1607 .data = &aio_nr, 1608 .maxlen = sizeof(aio_nr), 1609 .mode = 0444, 1610 .proc_handler = proc_doulongvec_minmax, 1611 }, 1612 { 1613 .procname = "aio-max-nr", 1614 .data = &aio_max_nr, 1615 .maxlen = sizeof(aio_max_nr), 1616 .mode = 0644, 1617 .proc_handler = proc_doulongvec_minmax, 1618 }, 1619 #endif /* CONFIG_AIO */ 1620 #ifdef CONFIG_INOTIFY_USER 1621 { 1622 .procname = "inotify", 1623 .mode = 0555, 1624 .child = inotify_table, 1625 }, 1626 #endif 1627 #ifdef CONFIG_EPOLL 1628 { 1629 .procname = "epoll", 1630 .mode = 0555, 1631 .child = epoll_table, 1632 }, 1633 #endif 1634 #endif 1635 { 1636 .procname = "protected_symlinks", 1637 .data = &sysctl_protected_symlinks, 1638 .maxlen = sizeof(int), 1639 .mode = 0600, 1640 .proc_handler = proc_dointvec_minmax, 1641 .extra1 = &zero, 1642 .extra2 = &one, 1643 }, 1644 { 1645 .procname = "protected_hardlinks", 1646 .data = &sysctl_protected_hardlinks, 1647 .maxlen = sizeof(int), 1648 .mode = 0600, 1649 .proc_handler = proc_dointvec_minmax, 1650 .extra1 = &zero, 1651 .extra2 = &one, 1652 }, 1653 { 1654 .procname = "suid_dumpable", 1655 .data = &suid_dumpable, 1656 .maxlen = sizeof(int), 1657 .mode = 0644, 1658 .proc_handler = proc_dointvec_minmax_coredump, 1659 .extra1 = &zero, 1660 .extra2 = &two, 1661 }, 1662 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1663 { 1664 .procname = "binfmt_misc", 1665 .mode = 0555, 1666 .child = binfmt_misc_table, 1667 }, 1668 #endif 1669 { 1670 .procname = "pipe-max-size", 1671 .data = &pipe_max_size, 1672 .maxlen = sizeof(int), 1673 .mode = 0644, 1674 .proc_handler = &pipe_proc_fn, 1675 .extra1 = &pipe_min_size, 1676 }, 1677 { } 1678 }; 1679 1680 static struct ctl_table debug_table[] = { 1681 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1682 { 1683 .procname = "exception-trace", 1684 .data = &show_unhandled_signals, 1685 .maxlen = sizeof(int), 1686 .mode = 0644, 1687 .proc_handler = proc_dointvec 1688 }, 1689 #endif 1690 #if defined(CONFIG_OPTPROBES) 1691 { 1692 .procname = "kprobes-optimization", 1693 .data = &sysctl_kprobes_optimization, 1694 .maxlen = sizeof(int), 1695 .mode = 0644, 1696 .proc_handler = proc_kprobes_optimization_handler, 1697 .extra1 = &zero, 1698 .extra2 = &one, 1699 }, 1700 #endif 1701 { } 1702 }; 1703 1704 static struct ctl_table dev_table[] = { 1705 { } 1706 }; 1707 1708 int __init sysctl_init(void) 1709 { 1710 struct ctl_table_header *hdr; 1711 1712 hdr = register_sysctl_table(sysctl_base_table); 1713 kmemleak_not_leak(hdr); 1714 return 0; 1715 } 1716 1717 #endif /* CONFIG_SYSCTL */ 1718 1719 /* 1720 * /proc/sys support 1721 */ 1722 1723 #ifdef CONFIG_PROC_SYSCTL 1724 1725 static int _proc_do_string(char *data, int maxlen, int write, 1726 char __user *buffer, 1727 size_t *lenp, loff_t *ppos) 1728 { 1729 size_t len; 1730 char __user *p; 1731 char c; 1732 1733 if (!data || !maxlen || !*lenp) { 1734 *lenp = 0; 1735 return 0; 1736 } 1737 1738 if (write) { 1739 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1740 /* Only continue writes not past the end of buffer. */ 1741 len = strlen(data); 1742 if (len > maxlen - 1) 1743 len = maxlen - 1; 1744 1745 if (*ppos > len) 1746 return 0; 1747 len = *ppos; 1748 } else { 1749 /* Start writing from beginning of buffer. */ 1750 len = 0; 1751 } 1752 1753 *ppos += *lenp; 1754 p = buffer; 1755 while ((p - buffer) < *lenp && len < maxlen - 1) { 1756 if (get_user(c, p++)) 1757 return -EFAULT; 1758 if (c == 0 || c == '\n') 1759 break; 1760 data[len++] = c; 1761 } 1762 data[len] = 0; 1763 } else { 1764 len = strlen(data); 1765 if (len > maxlen) 1766 len = maxlen; 1767 1768 if (*ppos > len) { 1769 *lenp = 0; 1770 return 0; 1771 } 1772 1773 data += *ppos; 1774 len -= *ppos; 1775 1776 if (len > *lenp) 1777 len = *lenp; 1778 if (len) 1779 if (copy_to_user(buffer, data, len)) 1780 return -EFAULT; 1781 if (len < *lenp) { 1782 if (put_user('\n', buffer + len)) 1783 return -EFAULT; 1784 len++; 1785 } 1786 *lenp = len; 1787 *ppos += len; 1788 } 1789 return 0; 1790 } 1791 1792 static void warn_sysctl_write(struct ctl_table *table) 1793 { 1794 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1795 "This will not be supported in the future. To silence this\n" 1796 "warning, set kernel.sysctl_writes_strict = -1\n", 1797 current->comm, table->procname); 1798 } 1799 1800 /** 1801 * proc_dostring - read a string sysctl 1802 * @table: the sysctl table 1803 * @write: %TRUE if this is a write to the sysctl file 1804 * @buffer: the user buffer 1805 * @lenp: the size of the user buffer 1806 * @ppos: file position 1807 * 1808 * Reads/writes a string from/to the user buffer. If the kernel 1809 * buffer provided is not large enough to hold the string, the 1810 * string is truncated. The copied string is %NULL-terminated. 1811 * If the string is being read by the user process, it is copied 1812 * and a newline '\n' is added. It is truncated if the buffer is 1813 * not large enough. 1814 * 1815 * Returns 0 on success. 1816 */ 1817 int proc_dostring(struct ctl_table *table, int write, 1818 void __user *buffer, size_t *lenp, loff_t *ppos) 1819 { 1820 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1821 warn_sysctl_write(table); 1822 1823 return _proc_do_string((char *)(table->data), table->maxlen, write, 1824 (char __user *)buffer, lenp, ppos); 1825 } 1826 1827 static size_t proc_skip_spaces(char **buf) 1828 { 1829 size_t ret; 1830 char *tmp = skip_spaces(*buf); 1831 ret = tmp - *buf; 1832 *buf = tmp; 1833 return ret; 1834 } 1835 1836 static void proc_skip_char(char **buf, size_t *size, const char v) 1837 { 1838 while (*size) { 1839 if (**buf != v) 1840 break; 1841 (*size)--; 1842 (*buf)++; 1843 } 1844 } 1845 1846 #define TMPBUFLEN 22 1847 /** 1848 * proc_get_long - reads an ASCII formatted integer from a user buffer 1849 * 1850 * @buf: a kernel buffer 1851 * @size: size of the kernel buffer 1852 * @val: this is where the number will be stored 1853 * @neg: set to %TRUE if number is negative 1854 * @perm_tr: a vector which contains the allowed trailers 1855 * @perm_tr_len: size of the perm_tr vector 1856 * @tr: pointer to store the trailer character 1857 * 1858 * In case of success %0 is returned and @buf and @size are updated with 1859 * the amount of bytes read. If @tr is non-NULL and a trailing 1860 * character exists (size is non-zero after returning from this 1861 * function), @tr is updated with the trailing character. 1862 */ 1863 static int proc_get_long(char **buf, size_t *size, 1864 unsigned long *val, bool *neg, 1865 const char *perm_tr, unsigned perm_tr_len, char *tr) 1866 { 1867 int len; 1868 char *p, tmp[TMPBUFLEN]; 1869 1870 if (!*size) 1871 return -EINVAL; 1872 1873 len = *size; 1874 if (len > TMPBUFLEN - 1) 1875 len = TMPBUFLEN - 1; 1876 1877 memcpy(tmp, *buf, len); 1878 1879 tmp[len] = 0; 1880 p = tmp; 1881 if (*p == '-' && *size > 1) { 1882 *neg = true; 1883 p++; 1884 } else 1885 *neg = false; 1886 if (!isdigit(*p)) 1887 return -EINVAL; 1888 1889 *val = simple_strtoul(p, &p, 0); 1890 1891 len = p - tmp; 1892 1893 /* We don't know if the next char is whitespace thus we may accept 1894 * invalid integers (e.g. 1234...a) or two integers instead of one 1895 * (e.g. 123...1). So lets not allow such large numbers. */ 1896 if (len == TMPBUFLEN - 1) 1897 return -EINVAL; 1898 1899 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1900 return -EINVAL; 1901 1902 if (tr && (len < *size)) 1903 *tr = *p; 1904 1905 *buf += len; 1906 *size -= len; 1907 1908 return 0; 1909 } 1910 1911 /** 1912 * proc_put_long - converts an integer to a decimal ASCII formatted string 1913 * 1914 * @buf: the user buffer 1915 * @size: the size of the user buffer 1916 * @val: the integer to be converted 1917 * @neg: sign of the number, %TRUE for negative 1918 * 1919 * In case of success %0 is returned and @buf and @size are updated with 1920 * the amount of bytes written. 1921 */ 1922 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1923 bool neg) 1924 { 1925 int len; 1926 char tmp[TMPBUFLEN], *p = tmp; 1927 1928 sprintf(p, "%s%lu", neg ? "-" : "", val); 1929 len = strlen(tmp); 1930 if (len > *size) 1931 len = *size; 1932 if (copy_to_user(*buf, tmp, len)) 1933 return -EFAULT; 1934 *size -= len; 1935 *buf += len; 1936 return 0; 1937 } 1938 #undef TMPBUFLEN 1939 1940 static int proc_put_char(void __user **buf, size_t *size, char c) 1941 { 1942 if (*size) { 1943 char __user **buffer = (char __user **)buf; 1944 if (put_user(c, *buffer)) 1945 return -EFAULT; 1946 (*size)--, (*buffer)++; 1947 *buf = *buffer; 1948 } 1949 return 0; 1950 } 1951 1952 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1953 int *valp, 1954 int write, void *data) 1955 { 1956 if (write) { 1957 *valp = *negp ? -*lvalp : *lvalp; 1958 } else { 1959 int val = *valp; 1960 if (val < 0) { 1961 *negp = true; 1962 *lvalp = (unsigned long)-val; 1963 } else { 1964 *negp = false; 1965 *lvalp = (unsigned long)val; 1966 } 1967 } 1968 return 0; 1969 } 1970 1971 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1972 1973 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1974 int write, void __user *buffer, 1975 size_t *lenp, loff_t *ppos, 1976 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1977 int write, void *data), 1978 void *data) 1979 { 1980 int *i, vleft, first = 1, err = 0; 1981 unsigned long page = 0; 1982 size_t left; 1983 char *kbuf; 1984 1985 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1986 *lenp = 0; 1987 return 0; 1988 } 1989 1990 i = (int *) tbl_data; 1991 vleft = table->maxlen / sizeof(*i); 1992 left = *lenp; 1993 1994 if (!conv) 1995 conv = do_proc_dointvec_conv; 1996 1997 if (write) { 1998 if (*ppos) { 1999 switch (sysctl_writes_strict) { 2000 case SYSCTL_WRITES_STRICT: 2001 goto out; 2002 case SYSCTL_WRITES_WARN: 2003 warn_sysctl_write(table); 2004 break; 2005 default: 2006 break; 2007 } 2008 } 2009 2010 if (left > PAGE_SIZE - 1) 2011 left = PAGE_SIZE - 1; 2012 page = __get_free_page(GFP_TEMPORARY); 2013 kbuf = (char *) page; 2014 if (!kbuf) 2015 return -ENOMEM; 2016 if (copy_from_user(kbuf, buffer, left)) { 2017 err = -EFAULT; 2018 goto free; 2019 } 2020 kbuf[left] = 0; 2021 } 2022 2023 for (; left && vleft--; i++, first=0) { 2024 unsigned long lval; 2025 bool neg; 2026 2027 if (write) { 2028 left -= proc_skip_spaces(&kbuf); 2029 2030 if (!left) 2031 break; 2032 err = proc_get_long(&kbuf, &left, &lval, &neg, 2033 proc_wspace_sep, 2034 sizeof(proc_wspace_sep), NULL); 2035 if (err) 2036 break; 2037 if (conv(&neg, &lval, i, 1, data)) { 2038 err = -EINVAL; 2039 break; 2040 } 2041 } else { 2042 if (conv(&neg, &lval, i, 0, data)) { 2043 err = -EINVAL; 2044 break; 2045 } 2046 if (!first) 2047 err = proc_put_char(&buffer, &left, '\t'); 2048 if (err) 2049 break; 2050 err = proc_put_long(&buffer, &left, lval, neg); 2051 if (err) 2052 break; 2053 } 2054 } 2055 2056 if (!write && !first && left && !err) 2057 err = proc_put_char(&buffer, &left, '\n'); 2058 if (write && !err && left) 2059 left -= proc_skip_spaces(&kbuf); 2060 free: 2061 if (write) { 2062 free_page(page); 2063 if (first) 2064 return err ? : -EINVAL; 2065 } 2066 *lenp -= left; 2067 out: 2068 *ppos += *lenp; 2069 return err; 2070 } 2071 2072 static int do_proc_dointvec(struct ctl_table *table, int write, 2073 void __user *buffer, size_t *lenp, loff_t *ppos, 2074 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2075 int write, void *data), 2076 void *data) 2077 { 2078 return __do_proc_dointvec(table->data, table, write, 2079 buffer, lenp, ppos, conv, data); 2080 } 2081 2082 /** 2083 * proc_dointvec - read a vector of integers 2084 * @table: the sysctl table 2085 * @write: %TRUE if this is a write to the sysctl file 2086 * @buffer: the user buffer 2087 * @lenp: the size of the user buffer 2088 * @ppos: file position 2089 * 2090 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2091 * values from/to the user buffer, treated as an ASCII string. 2092 * 2093 * Returns 0 on success. 2094 */ 2095 int proc_dointvec(struct ctl_table *table, int write, 2096 void __user *buffer, size_t *lenp, loff_t *ppos) 2097 { 2098 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2099 NULL,NULL); 2100 } 2101 2102 /* 2103 * Taint values can only be increased 2104 * This means we can safely use a temporary. 2105 */ 2106 static int proc_taint(struct ctl_table *table, int write, 2107 void __user *buffer, size_t *lenp, loff_t *ppos) 2108 { 2109 struct ctl_table t; 2110 unsigned long tmptaint = get_taint(); 2111 int err; 2112 2113 if (write && !capable(CAP_SYS_ADMIN)) 2114 return -EPERM; 2115 2116 t = *table; 2117 t.data = &tmptaint; 2118 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2119 if (err < 0) 2120 return err; 2121 2122 if (write) { 2123 /* 2124 * Poor man's atomic or. Not worth adding a primitive 2125 * to everyone's atomic.h for this 2126 */ 2127 int i; 2128 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2129 if ((tmptaint >> i) & 1) 2130 add_taint(i, LOCKDEP_STILL_OK); 2131 } 2132 } 2133 2134 return err; 2135 } 2136 2137 #ifdef CONFIG_PRINTK 2138 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2139 void __user *buffer, size_t *lenp, loff_t *ppos) 2140 { 2141 if (write && !capable(CAP_SYS_ADMIN)) 2142 return -EPERM; 2143 2144 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2145 } 2146 #endif 2147 2148 struct do_proc_dointvec_minmax_conv_param { 2149 int *min; 2150 int *max; 2151 }; 2152 2153 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2154 int *valp, 2155 int write, void *data) 2156 { 2157 struct do_proc_dointvec_minmax_conv_param *param = data; 2158 if (write) { 2159 int val = *negp ? -*lvalp : *lvalp; 2160 if ((param->min && *param->min > val) || 2161 (param->max && *param->max < val)) 2162 return -EINVAL; 2163 *valp = val; 2164 } else { 2165 int val = *valp; 2166 if (val < 0) { 2167 *negp = true; 2168 *lvalp = (unsigned long)-val; 2169 } else { 2170 *negp = false; 2171 *lvalp = (unsigned long)val; 2172 } 2173 } 2174 return 0; 2175 } 2176 2177 /** 2178 * proc_dointvec_minmax - read a vector of integers with min/max values 2179 * @table: the sysctl table 2180 * @write: %TRUE if this is a write to the sysctl file 2181 * @buffer: the user buffer 2182 * @lenp: the size of the user buffer 2183 * @ppos: file position 2184 * 2185 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2186 * values from/to the user buffer, treated as an ASCII string. 2187 * 2188 * This routine will ensure the values are within the range specified by 2189 * table->extra1 (min) and table->extra2 (max). 2190 * 2191 * Returns 0 on success. 2192 */ 2193 int proc_dointvec_minmax(struct ctl_table *table, int write, 2194 void __user *buffer, size_t *lenp, loff_t *ppos) 2195 { 2196 struct do_proc_dointvec_minmax_conv_param param = { 2197 .min = (int *) table->extra1, 2198 .max = (int *) table->extra2, 2199 }; 2200 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2201 do_proc_dointvec_minmax_conv, ¶m); 2202 } 2203 2204 static void validate_coredump_safety(void) 2205 { 2206 #ifdef CONFIG_COREDUMP 2207 if (suid_dumpable == SUID_DUMP_ROOT && 2208 core_pattern[0] != '/' && core_pattern[0] != '|') { 2209 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2210 "suid_dumpable=2. Pipe handler or fully qualified "\ 2211 "core dump path required.\n"); 2212 } 2213 #endif 2214 } 2215 2216 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2217 void __user *buffer, size_t *lenp, loff_t *ppos) 2218 { 2219 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2220 if (!error) 2221 validate_coredump_safety(); 2222 return error; 2223 } 2224 2225 #ifdef CONFIG_COREDUMP 2226 static int proc_dostring_coredump(struct ctl_table *table, int write, 2227 void __user *buffer, size_t *lenp, loff_t *ppos) 2228 { 2229 int error = proc_dostring(table, write, buffer, lenp, ppos); 2230 if (!error) 2231 validate_coredump_safety(); 2232 return error; 2233 } 2234 #endif 2235 2236 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2237 void __user *buffer, 2238 size_t *lenp, loff_t *ppos, 2239 unsigned long convmul, 2240 unsigned long convdiv) 2241 { 2242 unsigned long *i, *min, *max; 2243 int vleft, first = 1, err = 0; 2244 unsigned long page = 0; 2245 size_t left; 2246 char *kbuf; 2247 2248 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2249 *lenp = 0; 2250 return 0; 2251 } 2252 2253 i = (unsigned long *) data; 2254 min = (unsigned long *) table->extra1; 2255 max = (unsigned long *) table->extra2; 2256 vleft = table->maxlen / sizeof(unsigned long); 2257 left = *lenp; 2258 2259 if (write) { 2260 if (*ppos) { 2261 switch (sysctl_writes_strict) { 2262 case SYSCTL_WRITES_STRICT: 2263 goto out; 2264 case SYSCTL_WRITES_WARN: 2265 warn_sysctl_write(table); 2266 break; 2267 default: 2268 break; 2269 } 2270 } 2271 2272 if (left > PAGE_SIZE - 1) 2273 left = PAGE_SIZE - 1; 2274 page = __get_free_page(GFP_TEMPORARY); 2275 kbuf = (char *) page; 2276 if (!kbuf) 2277 return -ENOMEM; 2278 if (copy_from_user(kbuf, buffer, left)) { 2279 err = -EFAULT; 2280 goto free; 2281 } 2282 kbuf[left] = 0; 2283 } 2284 2285 for (; left && vleft--; i++, first = 0) { 2286 unsigned long val; 2287 2288 if (write) { 2289 bool neg; 2290 2291 left -= proc_skip_spaces(&kbuf); 2292 2293 err = proc_get_long(&kbuf, &left, &val, &neg, 2294 proc_wspace_sep, 2295 sizeof(proc_wspace_sep), NULL); 2296 if (err) 2297 break; 2298 if (neg) 2299 continue; 2300 if ((min && val < *min) || (max && val > *max)) 2301 continue; 2302 *i = val; 2303 } else { 2304 val = convdiv * (*i) / convmul; 2305 if (!first) { 2306 err = proc_put_char(&buffer, &left, '\t'); 2307 if (err) 2308 break; 2309 } 2310 err = proc_put_long(&buffer, &left, val, false); 2311 if (err) 2312 break; 2313 } 2314 } 2315 2316 if (!write && !first && left && !err) 2317 err = proc_put_char(&buffer, &left, '\n'); 2318 if (write && !err) 2319 left -= proc_skip_spaces(&kbuf); 2320 free: 2321 if (write) { 2322 free_page(page); 2323 if (first) 2324 return err ? : -EINVAL; 2325 } 2326 *lenp -= left; 2327 out: 2328 *ppos += *lenp; 2329 return err; 2330 } 2331 2332 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2333 void __user *buffer, 2334 size_t *lenp, loff_t *ppos, 2335 unsigned long convmul, 2336 unsigned long convdiv) 2337 { 2338 return __do_proc_doulongvec_minmax(table->data, table, write, 2339 buffer, lenp, ppos, convmul, convdiv); 2340 } 2341 2342 /** 2343 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2344 * @table: the sysctl table 2345 * @write: %TRUE if this is a write to the sysctl file 2346 * @buffer: the user buffer 2347 * @lenp: the size of the user buffer 2348 * @ppos: file position 2349 * 2350 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2351 * values from/to the user buffer, treated as an ASCII string. 2352 * 2353 * This routine will ensure the values are within the range specified by 2354 * table->extra1 (min) and table->extra2 (max). 2355 * 2356 * Returns 0 on success. 2357 */ 2358 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2359 void __user *buffer, size_t *lenp, loff_t *ppos) 2360 { 2361 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2362 } 2363 2364 /** 2365 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2366 * @table: the sysctl table 2367 * @write: %TRUE if this is a write to the sysctl file 2368 * @buffer: the user buffer 2369 * @lenp: the size of the user buffer 2370 * @ppos: file position 2371 * 2372 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2373 * values from/to the user buffer, treated as an ASCII string. The values 2374 * are treated as milliseconds, and converted to jiffies when they are stored. 2375 * 2376 * This routine will ensure the values are within the range specified by 2377 * table->extra1 (min) and table->extra2 (max). 2378 * 2379 * Returns 0 on success. 2380 */ 2381 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2382 void __user *buffer, 2383 size_t *lenp, loff_t *ppos) 2384 { 2385 return do_proc_doulongvec_minmax(table, write, buffer, 2386 lenp, ppos, HZ, 1000l); 2387 } 2388 2389 2390 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2391 int *valp, 2392 int write, void *data) 2393 { 2394 if (write) { 2395 if (*lvalp > LONG_MAX / HZ) 2396 return 1; 2397 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2398 } else { 2399 int val = *valp; 2400 unsigned long lval; 2401 if (val < 0) { 2402 *negp = true; 2403 lval = (unsigned long)-val; 2404 } else { 2405 *negp = false; 2406 lval = (unsigned long)val; 2407 } 2408 *lvalp = lval / HZ; 2409 } 2410 return 0; 2411 } 2412 2413 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2414 int *valp, 2415 int write, void *data) 2416 { 2417 if (write) { 2418 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2419 return 1; 2420 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2421 } else { 2422 int val = *valp; 2423 unsigned long lval; 2424 if (val < 0) { 2425 *negp = true; 2426 lval = (unsigned long)-val; 2427 } else { 2428 *negp = false; 2429 lval = (unsigned long)val; 2430 } 2431 *lvalp = jiffies_to_clock_t(lval); 2432 } 2433 return 0; 2434 } 2435 2436 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2437 int *valp, 2438 int write, void *data) 2439 { 2440 if (write) { 2441 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2442 2443 if (jif > INT_MAX) 2444 return 1; 2445 *valp = (int)jif; 2446 } else { 2447 int val = *valp; 2448 unsigned long lval; 2449 if (val < 0) { 2450 *negp = true; 2451 lval = (unsigned long)-val; 2452 } else { 2453 *negp = false; 2454 lval = (unsigned long)val; 2455 } 2456 *lvalp = jiffies_to_msecs(lval); 2457 } 2458 return 0; 2459 } 2460 2461 /** 2462 * proc_dointvec_jiffies - read a vector of integers as seconds 2463 * @table: the sysctl table 2464 * @write: %TRUE if this is a write to the sysctl file 2465 * @buffer: the user buffer 2466 * @lenp: the size of the user buffer 2467 * @ppos: file position 2468 * 2469 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2470 * values from/to the user buffer, treated as an ASCII string. 2471 * The values read are assumed to be in seconds, and are converted into 2472 * jiffies. 2473 * 2474 * Returns 0 on success. 2475 */ 2476 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2477 void __user *buffer, size_t *lenp, loff_t *ppos) 2478 { 2479 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2480 do_proc_dointvec_jiffies_conv,NULL); 2481 } 2482 2483 /** 2484 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2485 * @table: the sysctl table 2486 * @write: %TRUE if this is a write to the sysctl file 2487 * @buffer: the user buffer 2488 * @lenp: the size of the user buffer 2489 * @ppos: pointer to the file position 2490 * 2491 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2492 * values from/to the user buffer, treated as an ASCII string. 2493 * The values read are assumed to be in 1/USER_HZ seconds, and 2494 * are converted into jiffies. 2495 * 2496 * Returns 0 on success. 2497 */ 2498 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2499 void __user *buffer, size_t *lenp, loff_t *ppos) 2500 { 2501 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2502 do_proc_dointvec_userhz_jiffies_conv,NULL); 2503 } 2504 2505 /** 2506 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2507 * @table: the sysctl table 2508 * @write: %TRUE if this is a write to the sysctl file 2509 * @buffer: the user buffer 2510 * @lenp: the size of the user buffer 2511 * @ppos: file position 2512 * @ppos: the current position in the file 2513 * 2514 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2515 * values from/to the user buffer, treated as an ASCII string. 2516 * The values read are assumed to be in 1/1000 seconds, and 2517 * are converted into jiffies. 2518 * 2519 * Returns 0 on success. 2520 */ 2521 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2522 void __user *buffer, size_t *lenp, loff_t *ppos) 2523 { 2524 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2525 do_proc_dointvec_ms_jiffies_conv, NULL); 2526 } 2527 2528 static int proc_do_cad_pid(struct ctl_table *table, int write, 2529 void __user *buffer, size_t *lenp, loff_t *ppos) 2530 { 2531 struct pid *new_pid; 2532 pid_t tmp; 2533 int r; 2534 2535 tmp = pid_vnr(cad_pid); 2536 2537 r = __do_proc_dointvec(&tmp, table, write, buffer, 2538 lenp, ppos, NULL, NULL); 2539 if (r || !write) 2540 return r; 2541 2542 new_pid = find_get_pid(tmp); 2543 if (!new_pid) 2544 return -ESRCH; 2545 2546 put_pid(xchg(&cad_pid, new_pid)); 2547 return 0; 2548 } 2549 2550 /** 2551 * proc_do_large_bitmap - read/write from/to a large bitmap 2552 * @table: the sysctl table 2553 * @write: %TRUE if this is a write to the sysctl file 2554 * @buffer: the user buffer 2555 * @lenp: the size of the user buffer 2556 * @ppos: file position 2557 * 2558 * The bitmap is stored at table->data and the bitmap length (in bits) 2559 * in table->maxlen. 2560 * 2561 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2562 * large bitmaps may be represented in a compact manner. Writing into 2563 * the file will clear the bitmap then update it with the given input. 2564 * 2565 * Returns 0 on success. 2566 */ 2567 int proc_do_large_bitmap(struct ctl_table *table, int write, 2568 void __user *buffer, size_t *lenp, loff_t *ppos) 2569 { 2570 int err = 0; 2571 bool first = 1; 2572 size_t left = *lenp; 2573 unsigned long bitmap_len = table->maxlen; 2574 unsigned long *bitmap = *(unsigned long **) table->data; 2575 unsigned long *tmp_bitmap = NULL; 2576 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2577 2578 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2579 *lenp = 0; 2580 return 0; 2581 } 2582 2583 if (write) { 2584 unsigned long page = 0; 2585 char *kbuf; 2586 2587 if (left > PAGE_SIZE - 1) 2588 left = PAGE_SIZE - 1; 2589 2590 page = __get_free_page(GFP_TEMPORARY); 2591 kbuf = (char *) page; 2592 if (!kbuf) 2593 return -ENOMEM; 2594 if (copy_from_user(kbuf, buffer, left)) { 2595 free_page(page); 2596 return -EFAULT; 2597 } 2598 kbuf[left] = 0; 2599 2600 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2601 GFP_KERNEL); 2602 if (!tmp_bitmap) { 2603 free_page(page); 2604 return -ENOMEM; 2605 } 2606 proc_skip_char(&kbuf, &left, '\n'); 2607 while (!err && left) { 2608 unsigned long val_a, val_b; 2609 bool neg; 2610 2611 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2612 sizeof(tr_a), &c); 2613 if (err) 2614 break; 2615 if (val_a >= bitmap_len || neg) { 2616 err = -EINVAL; 2617 break; 2618 } 2619 2620 val_b = val_a; 2621 if (left) { 2622 kbuf++; 2623 left--; 2624 } 2625 2626 if (c == '-') { 2627 err = proc_get_long(&kbuf, &left, &val_b, 2628 &neg, tr_b, sizeof(tr_b), 2629 &c); 2630 if (err) 2631 break; 2632 if (val_b >= bitmap_len || neg || 2633 val_a > val_b) { 2634 err = -EINVAL; 2635 break; 2636 } 2637 if (left) { 2638 kbuf++; 2639 left--; 2640 } 2641 } 2642 2643 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2644 first = 0; 2645 proc_skip_char(&kbuf, &left, '\n'); 2646 } 2647 free_page(page); 2648 } else { 2649 unsigned long bit_a, bit_b = 0; 2650 2651 while (left) { 2652 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2653 if (bit_a >= bitmap_len) 2654 break; 2655 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2656 bit_a + 1) - 1; 2657 2658 if (!first) { 2659 err = proc_put_char(&buffer, &left, ','); 2660 if (err) 2661 break; 2662 } 2663 err = proc_put_long(&buffer, &left, bit_a, false); 2664 if (err) 2665 break; 2666 if (bit_a != bit_b) { 2667 err = proc_put_char(&buffer, &left, '-'); 2668 if (err) 2669 break; 2670 err = proc_put_long(&buffer, &left, bit_b, false); 2671 if (err) 2672 break; 2673 } 2674 2675 first = 0; bit_b++; 2676 } 2677 if (!err) 2678 err = proc_put_char(&buffer, &left, '\n'); 2679 } 2680 2681 if (!err) { 2682 if (write) { 2683 if (*ppos) 2684 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2685 else 2686 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2687 } 2688 kfree(tmp_bitmap); 2689 *lenp -= left; 2690 *ppos += *lenp; 2691 return 0; 2692 } else { 2693 kfree(tmp_bitmap); 2694 return err; 2695 } 2696 } 2697 2698 #else /* CONFIG_PROC_SYSCTL */ 2699 2700 int proc_dostring(struct ctl_table *table, int write, 2701 void __user *buffer, size_t *lenp, loff_t *ppos) 2702 { 2703 return -ENOSYS; 2704 } 2705 2706 int proc_dointvec(struct ctl_table *table, int write, 2707 void __user *buffer, size_t *lenp, loff_t *ppos) 2708 { 2709 return -ENOSYS; 2710 } 2711 2712 int proc_dointvec_minmax(struct ctl_table *table, int write, 2713 void __user *buffer, size_t *lenp, loff_t *ppos) 2714 { 2715 return -ENOSYS; 2716 } 2717 2718 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2719 void __user *buffer, size_t *lenp, loff_t *ppos) 2720 { 2721 return -ENOSYS; 2722 } 2723 2724 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2725 void __user *buffer, size_t *lenp, loff_t *ppos) 2726 { 2727 return -ENOSYS; 2728 } 2729 2730 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2731 void __user *buffer, size_t *lenp, loff_t *ppos) 2732 { 2733 return -ENOSYS; 2734 } 2735 2736 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2737 void __user *buffer, size_t *lenp, loff_t *ppos) 2738 { 2739 return -ENOSYS; 2740 } 2741 2742 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2743 void __user *buffer, 2744 size_t *lenp, loff_t *ppos) 2745 { 2746 return -ENOSYS; 2747 } 2748 2749 2750 #endif /* CONFIG_PROC_SYSCTL */ 2751 2752 /* 2753 * No sense putting this after each symbol definition, twice, 2754 * exception granted :-) 2755 */ 2756 EXPORT_SYMBOL(proc_dointvec); 2757 EXPORT_SYMBOL(proc_dointvec_jiffies); 2758 EXPORT_SYMBOL(proc_dointvec_minmax); 2759 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2760 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2761 EXPORT_SYMBOL(proc_dostring); 2762 EXPORT_SYMBOL(proc_doulongvec_minmax); 2763 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2764