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 #ifdef CONFIG_MEMORY_FAILURE 1464 { 1465 .procname = "memory_failure_early_kill", 1466 .data = &sysctl_memory_failure_early_kill, 1467 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1468 .mode = 0644, 1469 .proc_handler = proc_dointvec_minmax, 1470 .extra1 = &zero, 1471 .extra2 = &one, 1472 }, 1473 { 1474 .procname = "memory_failure_recovery", 1475 .data = &sysctl_memory_failure_recovery, 1476 .maxlen = sizeof(sysctl_memory_failure_recovery), 1477 .mode = 0644, 1478 .proc_handler = proc_dointvec_minmax, 1479 .extra1 = &zero, 1480 .extra2 = &one, 1481 }, 1482 #endif 1483 { 1484 .procname = "user_reserve_kbytes", 1485 .data = &sysctl_user_reserve_kbytes, 1486 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1487 .mode = 0644, 1488 .proc_handler = proc_doulongvec_minmax, 1489 }, 1490 { 1491 .procname = "admin_reserve_kbytes", 1492 .data = &sysctl_admin_reserve_kbytes, 1493 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1494 .mode = 0644, 1495 .proc_handler = proc_doulongvec_minmax, 1496 }, 1497 { } 1498 }; 1499 1500 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1501 static struct ctl_table binfmt_misc_table[] = { 1502 { } 1503 }; 1504 #endif 1505 1506 static struct ctl_table fs_table[] = { 1507 { 1508 .procname = "inode-nr", 1509 .data = &inodes_stat, 1510 .maxlen = 2*sizeof(long), 1511 .mode = 0444, 1512 .proc_handler = proc_nr_inodes, 1513 }, 1514 { 1515 .procname = "inode-state", 1516 .data = &inodes_stat, 1517 .maxlen = 7*sizeof(long), 1518 .mode = 0444, 1519 .proc_handler = proc_nr_inodes, 1520 }, 1521 { 1522 .procname = "file-nr", 1523 .data = &files_stat, 1524 .maxlen = sizeof(files_stat), 1525 .mode = 0444, 1526 .proc_handler = proc_nr_files, 1527 }, 1528 { 1529 .procname = "file-max", 1530 .data = &files_stat.max_files, 1531 .maxlen = sizeof(files_stat.max_files), 1532 .mode = 0644, 1533 .proc_handler = proc_doulongvec_minmax, 1534 }, 1535 { 1536 .procname = "nr_open", 1537 .data = &sysctl_nr_open, 1538 .maxlen = sizeof(int), 1539 .mode = 0644, 1540 .proc_handler = proc_dointvec_minmax, 1541 .extra1 = &sysctl_nr_open_min, 1542 .extra2 = &sysctl_nr_open_max, 1543 }, 1544 { 1545 .procname = "dentry-state", 1546 .data = &dentry_stat, 1547 .maxlen = 6*sizeof(long), 1548 .mode = 0444, 1549 .proc_handler = proc_nr_dentry, 1550 }, 1551 { 1552 .procname = "overflowuid", 1553 .data = &fs_overflowuid, 1554 .maxlen = sizeof(int), 1555 .mode = 0644, 1556 .proc_handler = proc_dointvec_minmax, 1557 .extra1 = &minolduid, 1558 .extra2 = &maxolduid, 1559 }, 1560 { 1561 .procname = "overflowgid", 1562 .data = &fs_overflowgid, 1563 .maxlen = sizeof(int), 1564 .mode = 0644, 1565 .proc_handler = proc_dointvec_minmax, 1566 .extra1 = &minolduid, 1567 .extra2 = &maxolduid, 1568 }, 1569 #ifdef CONFIG_FILE_LOCKING 1570 { 1571 .procname = "leases-enable", 1572 .data = &leases_enable, 1573 .maxlen = sizeof(int), 1574 .mode = 0644, 1575 .proc_handler = proc_dointvec, 1576 }, 1577 #endif 1578 #ifdef CONFIG_DNOTIFY 1579 { 1580 .procname = "dir-notify-enable", 1581 .data = &dir_notify_enable, 1582 .maxlen = sizeof(int), 1583 .mode = 0644, 1584 .proc_handler = proc_dointvec, 1585 }, 1586 #endif 1587 #ifdef CONFIG_MMU 1588 #ifdef CONFIG_FILE_LOCKING 1589 { 1590 .procname = "lease-break-time", 1591 .data = &lease_break_time, 1592 .maxlen = sizeof(int), 1593 .mode = 0644, 1594 .proc_handler = proc_dointvec, 1595 }, 1596 #endif 1597 #ifdef CONFIG_AIO 1598 { 1599 .procname = "aio-nr", 1600 .data = &aio_nr, 1601 .maxlen = sizeof(aio_nr), 1602 .mode = 0444, 1603 .proc_handler = proc_doulongvec_minmax, 1604 }, 1605 { 1606 .procname = "aio-max-nr", 1607 .data = &aio_max_nr, 1608 .maxlen = sizeof(aio_max_nr), 1609 .mode = 0644, 1610 .proc_handler = proc_doulongvec_minmax, 1611 }, 1612 #endif /* CONFIG_AIO */ 1613 #ifdef CONFIG_INOTIFY_USER 1614 { 1615 .procname = "inotify", 1616 .mode = 0555, 1617 .child = inotify_table, 1618 }, 1619 #endif 1620 #ifdef CONFIG_EPOLL 1621 { 1622 .procname = "epoll", 1623 .mode = 0555, 1624 .child = epoll_table, 1625 }, 1626 #endif 1627 #endif 1628 { 1629 .procname = "protected_symlinks", 1630 .data = &sysctl_protected_symlinks, 1631 .maxlen = sizeof(int), 1632 .mode = 0600, 1633 .proc_handler = proc_dointvec_minmax, 1634 .extra1 = &zero, 1635 .extra2 = &one, 1636 }, 1637 { 1638 .procname = "protected_hardlinks", 1639 .data = &sysctl_protected_hardlinks, 1640 .maxlen = sizeof(int), 1641 .mode = 0600, 1642 .proc_handler = proc_dointvec_minmax, 1643 .extra1 = &zero, 1644 .extra2 = &one, 1645 }, 1646 { 1647 .procname = "suid_dumpable", 1648 .data = &suid_dumpable, 1649 .maxlen = sizeof(int), 1650 .mode = 0644, 1651 .proc_handler = proc_dointvec_minmax_coredump, 1652 .extra1 = &zero, 1653 .extra2 = &two, 1654 }, 1655 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1656 { 1657 .procname = "binfmt_misc", 1658 .mode = 0555, 1659 .child = binfmt_misc_table, 1660 }, 1661 #endif 1662 { 1663 .procname = "pipe-max-size", 1664 .data = &pipe_max_size, 1665 .maxlen = sizeof(int), 1666 .mode = 0644, 1667 .proc_handler = &pipe_proc_fn, 1668 .extra1 = &pipe_min_size, 1669 }, 1670 { } 1671 }; 1672 1673 static struct ctl_table debug_table[] = { 1674 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1675 { 1676 .procname = "exception-trace", 1677 .data = &show_unhandled_signals, 1678 .maxlen = sizeof(int), 1679 .mode = 0644, 1680 .proc_handler = proc_dointvec 1681 }, 1682 #endif 1683 #if defined(CONFIG_OPTPROBES) 1684 { 1685 .procname = "kprobes-optimization", 1686 .data = &sysctl_kprobes_optimization, 1687 .maxlen = sizeof(int), 1688 .mode = 0644, 1689 .proc_handler = proc_kprobes_optimization_handler, 1690 .extra1 = &zero, 1691 .extra2 = &one, 1692 }, 1693 #endif 1694 { } 1695 }; 1696 1697 static struct ctl_table dev_table[] = { 1698 { } 1699 }; 1700 1701 int __init sysctl_init(void) 1702 { 1703 struct ctl_table_header *hdr; 1704 1705 hdr = register_sysctl_table(sysctl_base_table); 1706 kmemleak_not_leak(hdr); 1707 return 0; 1708 } 1709 1710 #endif /* CONFIG_SYSCTL */ 1711 1712 /* 1713 * /proc/sys support 1714 */ 1715 1716 #ifdef CONFIG_PROC_SYSCTL 1717 1718 static int _proc_do_string(char *data, int maxlen, int write, 1719 char __user *buffer, 1720 size_t *lenp, loff_t *ppos) 1721 { 1722 size_t len; 1723 char __user *p; 1724 char c; 1725 1726 if (!data || !maxlen || !*lenp) { 1727 *lenp = 0; 1728 return 0; 1729 } 1730 1731 if (write) { 1732 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1733 /* Only continue writes not past the end of buffer. */ 1734 len = strlen(data); 1735 if (len > maxlen - 1) 1736 len = maxlen - 1; 1737 1738 if (*ppos > len) 1739 return 0; 1740 len = *ppos; 1741 } else { 1742 /* Start writing from beginning of buffer. */ 1743 len = 0; 1744 } 1745 1746 *ppos += *lenp; 1747 p = buffer; 1748 while ((p - buffer) < *lenp && len < maxlen - 1) { 1749 if (get_user(c, p++)) 1750 return -EFAULT; 1751 if (c == 0 || c == '\n') 1752 break; 1753 data[len++] = c; 1754 } 1755 data[len] = 0; 1756 } else { 1757 len = strlen(data); 1758 if (len > maxlen) 1759 len = maxlen; 1760 1761 if (*ppos > len) { 1762 *lenp = 0; 1763 return 0; 1764 } 1765 1766 data += *ppos; 1767 len -= *ppos; 1768 1769 if (len > *lenp) 1770 len = *lenp; 1771 if (len) 1772 if (copy_to_user(buffer, data, len)) 1773 return -EFAULT; 1774 if (len < *lenp) { 1775 if (put_user('\n', buffer + len)) 1776 return -EFAULT; 1777 len++; 1778 } 1779 *lenp = len; 1780 *ppos += len; 1781 } 1782 return 0; 1783 } 1784 1785 static void warn_sysctl_write(struct ctl_table *table) 1786 { 1787 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1788 "This will not be supported in the future. To silence this\n" 1789 "warning, set kernel.sysctl_writes_strict = -1\n", 1790 current->comm, table->procname); 1791 } 1792 1793 /** 1794 * proc_dostring - read a string sysctl 1795 * @table: the sysctl table 1796 * @write: %TRUE if this is a write to the sysctl file 1797 * @buffer: the user buffer 1798 * @lenp: the size of the user buffer 1799 * @ppos: file position 1800 * 1801 * Reads/writes a string from/to the user buffer. If the kernel 1802 * buffer provided is not large enough to hold the string, the 1803 * string is truncated. The copied string is %NULL-terminated. 1804 * If the string is being read by the user process, it is copied 1805 * and a newline '\n' is added. It is truncated if the buffer is 1806 * not large enough. 1807 * 1808 * Returns 0 on success. 1809 */ 1810 int proc_dostring(struct ctl_table *table, int write, 1811 void __user *buffer, size_t *lenp, loff_t *ppos) 1812 { 1813 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1814 warn_sysctl_write(table); 1815 1816 return _proc_do_string((char *)(table->data), table->maxlen, write, 1817 (char __user *)buffer, lenp, ppos); 1818 } 1819 1820 static size_t proc_skip_spaces(char **buf) 1821 { 1822 size_t ret; 1823 char *tmp = skip_spaces(*buf); 1824 ret = tmp - *buf; 1825 *buf = tmp; 1826 return ret; 1827 } 1828 1829 static void proc_skip_char(char **buf, size_t *size, const char v) 1830 { 1831 while (*size) { 1832 if (**buf != v) 1833 break; 1834 (*size)--; 1835 (*buf)++; 1836 } 1837 } 1838 1839 #define TMPBUFLEN 22 1840 /** 1841 * proc_get_long - reads an ASCII formatted integer from a user buffer 1842 * 1843 * @buf: a kernel buffer 1844 * @size: size of the kernel buffer 1845 * @val: this is where the number will be stored 1846 * @neg: set to %TRUE if number is negative 1847 * @perm_tr: a vector which contains the allowed trailers 1848 * @perm_tr_len: size of the perm_tr vector 1849 * @tr: pointer to store the trailer character 1850 * 1851 * In case of success %0 is returned and @buf and @size are updated with 1852 * the amount of bytes read. If @tr is non-NULL and a trailing 1853 * character exists (size is non-zero after returning from this 1854 * function), @tr is updated with the trailing character. 1855 */ 1856 static int proc_get_long(char **buf, size_t *size, 1857 unsigned long *val, bool *neg, 1858 const char *perm_tr, unsigned perm_tr_len, char *tr) 1859 { 1860 int len; 1861 char *p, tmp[TMPBUFLEN]; 1862 1863 if (!*size) 1864 return -EINVAL; 1865 1866 len = *size; 1867 if (len > TMPBUFLEN - 1) 1868 len = TMPBUFLEN - 1; 1869 1870 memcpy(tmp, *buf, len); 1871 1872 tmp[len] = 0; 1873 p = tmp; 1874 if (*p == '-' && *size > 1) { 1875 *neg = true; 1876 p++; 1877 } else 1878 *neg = false; 1879 if (!isdigit(*p)) 1880 return -EINVAL; 1881 1882 *val = simple_strtoul(p, &p, 0); 1883 1884 len = p - tmp; 1885 1886 /* We don't know if the next char is whitespace thus we may accept 1887 * invalid integers (e.g. 1234...a) or two integers instead of one 1888 * (e.g. 123...1). So lets not allow such large numbers. */ 1889 if (len == TMPBUFLEN - 1) 1890 return -EINVAL; 1891 1892 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1893 return -EINVAL; 1894 1895 if (tr && (len < *size)) 1896 *tr = *p; 1897 1898 *buf += len; 1899 *size -= len; 1900 1901 return 0; 1902 } 1903 1904 /** 1905 * proc_put_long - converts an integer to a decimal ASCII formatted string 1906 * 1907 * @buf: the user buffer 1908 * @size: the size of the user buffer 1909 * @val: the integer to be converted 1910 * @neg: sign of the number, %TRUE for negative 1911 * 1912 * In case of success %0 is returned and @buf and @size are updated with 1913 * the amount of bytes written. 1914 */ 1915 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1916 bool neg) 1917 { 1918 int len; 1919 char tmp[TMPBUFLEN], *p = tmp; 1920 1921 sprintf(p, "%s%lu", neg ? "-" : "", val); 1922 len = strlen(tmp); 1923 if (len > *size) 1924 len = *size; 1925 if (copy_to_user(*buf, tmp, len)) 1926 return -EFAULT; 1927 *size -= len; 1928 *buf += len; 1929 return 0; 1930 } 1931 #undef TMPBUFLEN 1932 1933 static int proc_put_char(void __user **buf, size_t *size, char c) 1934 { 1935 if (*size) { 1936 char __user **buffer = (char __user **)buf; 1937 if (put_user(c, *buffer)) 1938 return -EFAULT; 1939 (*size)--, (*buffer)++; 1940 *buf = *buffer; 1941 } 1942 return 0; 1943 } 1944 1945 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1946 int *valp, 1947 int write, void *data) 1948 { 1949 if (write) { 1950 *valp = *negp ? -*lvalp : *lvalp; 1951 } else { 1952 int val = *valp; 1953 if (val < 0) { 1954 *negp = true; 1955 *lvalp = (unsigned long)-val; 1956 } else { 1957 *negp = false; 1958 *lvalp = (unsigned long)val; 1959 } 1960 } 1961 return 0; 1962 } 1963 1964 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1965 1966 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1967 int write, void __user *buffer, 1968 size_t *lenp, loff_t *ppos, 1969 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1970 int write, void *data), 1971 void *data) 1972 { 1973 int *i, vleft, first = 1, err = 0; 1974 unsigned long page = 0; 1975 size_t left; 1976 char *kbuf; 1977 1978 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1979 *lenp = 0; 1980 return 0; 1981 } 1982 1983 i = (int *) tbl_data; 1984 vleft = table->maxlen / sizeof(*i); 1985 left = *lenp; 1986 1987 if (!conv) 1988 conv = do_proc_dointvec_conv; 1989 1990 if (write) { 1991 if (*ppos) { 1992 switch (sysctl_writes_strict) { 1993 case SYSCTL_WRITES_STRICT: 1994 goto out; 1995 case SYSCTL_WRITES_WARN: 1996 warn_sysctl_write(table); 1997 break; 1998 default: 1999 break; 2000 } 2001 } 2002 2003 if (left > PAGE_SIZE - 1) 2004 left = PAGE_SIZE - 1; 2005 page = __get_free_page(GFP_TEMPORARY); 2006 kbuf = (char *) page; 2007 if (!kbuf) 2008 return -ENOMEM; 2009 if (copy_from_user(kbuf, buffer, left)) { 2010 err = -EFAULT; 2011 goto free; 2012 } 2013 kbuf[left] = 0; 2014 } 2015 2016 for (; left && vleft--; i++, first=0) { 2017 unsigned long lval; 2018 bool neg; 2019 2020 if (write) { 2021 left -= proc_skip_spaces(&kbuf); 2022 2023 if (!left) 2024 break; 2025 err = proc_get_long(&kbuf, &left, &lval, &neg, 2026 proc_wspace_sep, 2027 sizeof(proc_wspace_sep), NULL); 2028 if (err) 2029 break; 2030 if (conv(&neg, &lval, i, 1, data)) { 2031 err = -EINVAL; 2032 break; 2033 } 2034 } else { 2035 if (conv(&neg, &lval, i, 0, data)) { 2036 err = -EINVAL; 2037 break; 2038 } 2039 if (!first) 2040 err = proc_put_char(&buffer, &left, '\t'); 2041 if (err) 2042 break; 2043 err = proc_put_long(&buffer, &left, lval, neg); 2044 if (err) 2045 break; 2046 } 2047 } 2048 2049 if (!write && !first && left && !err) 2050 err = proc_put_char(&buffer, &left, '\n'); 2051 if (write && !err && left) 2052 left -= proc_skip_spaces(&kbuf); 2053 free: 2054 if (write) { 2055 free_page(page); 2056 if (first) 2057 return err ? : -EINVAL; 2058 } 2059 *lenp -= left; 2060 out: 2061 *ppos += *lenp; 2062 return err; 2063 } 2064 2065 static int do_proc_dointvec(struct ctl_table *table, int write, 2066 void __user *buffer, size_t *lenp, loff_t *ppos, 2067 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2068 int write, void *data), 2069 void *data) 2070 { 2071 return __do_proc_dointvec(table->data, table, write, 2072 buffer, lenp, ppos, conv, data); 2073 } 2074 2075 /** 2076 * proc_dointvec - read a vector of integers 2077 * @table: the sysctl table 2078 * @write: %TRUE if this is a write to the sysctl file 2079 * @buffer: the user buffer 2080 * @lenp: the size of the user buffer 2081 * @ppos: file position 2082 * 2083 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2084 * values from/to the user buffer, treated as an ASCII string. 2085 * 2086 * Returns 0 on success. 2087 */ 2088 int proc_dointvec(struct ctl_table *table, int write, 2089 void __user *buffer, size_t *lenp, loff_t *ppos) 2090 { 2091 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2092 NULL,NULL); 2093 } 2094 2095 /* 2096 * Taint values can only be increased 2097 * This means we can safely use a temporary. 2098 */ 2099 static int proc_taint(struct ctl_table *table, int write, 2100 void __user *buffer, size_t *lenp, loff_t *ppos) 2101 { 2102 struct ctl_table t; 2103 unsigned long tmptaint = get_taint(); 2104 int err; 2105 2106 if (write && !capable(CAP_SYS_ADMIN)) 2107 return -EPERM; 2108 2109 t = *table; 2110 t.data = &tmptaint; 2111 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2112 if (err < 0) 2113 return err; 2114 2115 if (write) { 2116 /* 2117 * Poor man's atomic or. Not worth adding a primitive 2118 * to everyone's atomic.h for this 2119 */ 2120 int i; 2121 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2122 if ((tmptaint >> i) & 1) 2123 add_taint(i, LOCKDEP_STILL_OK); 2124 } 2125 } 2126 2127 return err; 2128 } 2129 2130 #ifdef CONFIG_PRINTK 2131 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2132 void __user *buffer, size_t *lenp, loff_t *ppos) 2133 { 2134 if (write && !capable(CAP_SYS_ADMIN)) 2135 return -EPERM; 2136 2137 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2138 } 2139 #endif 2140 2141 struct do_proc_dointvec_minmax_conv_param { 2142 int *min; 2143 int *max; 2144 }; 2145 2146 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2147 int *valp, 2148 int write, void *data) 2149 { 2150 struct do_proc_dointvec_minmax_conv_param *param = data; 2151 if (write) { 2152 int val = *negp ? -*lvalp : *lvalp; 2153 if ((param->min && *param->min > val) || 2154 (param->max && *param->max < val)) 2155 return -EINVAL; 2156 *valp = val; 2157 } else { 2158 int val = *valp; 2159 if (val < 0) { 2160 *negp = true; 2161 *lvalp = (unsigned long)-val; 2162 } else { 2163 *negp = false; 2164 *lvalp = (unsigned long)val; 2165 } 2166 } 2167 return 0; 2168 } 2169 2170 /** 2171 * proc_dointvec_minmax - read a vector of integers with min/max values 2172 * @table: the sysctl table 2173 * @write: %TRUE if this is a write to the sysctl file 2174 * @buffer: the user buffer 2175 * @lenp: the size of the user buffer 2176 * @ppos: file position 2177 * 2178 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2179 * values from/to the user buffer, treated as an ASCII string. 2180 * 2181 * This routine will ensure the values are within the range specified by 2182 * table->extra1 (min) and table->extra2 (max). 2183 * 2184 * Returns 0 on success. 2185 */ 2186 int proc_dointvec_minmax(struct ctl_table *table, int write, 2187 void __user *buffer, size_t *lenp, loff_t *ppos) 2188 { 2189 struct do_proc_dointvec_minmax_conv_param param = { 2190 .min = (int *) table->extra1, 2191 .max = (int *) table->extra2, 2192 }; 2193 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2194 do_proc_dointvec_minmax_conv, ¶m); 2195 } 2196 2197 static void validate_coredump_safety(void) 2198 { 2199 #ifdef CONFIG_COREDUMP 2200 if (suid_dumpable == SUID_DUMP_ROOT && 2201 core_pattern[0] != '/' && core_pattern[0] != '|') { 2202 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2203 "suid_dumpable=2. Pipe handler or fully qualified "\ 2204 "core dump path required.\n"); 2205 } 2206 #endif 2207 } 2208 2209 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2210 void __user *buffer, size_t *lenp, loff_t *ppos) 2211 { 2212 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2213 if (!error) 2214 validate_coredump_safety(); 2215 return error; 2216 } 2217 2218 #ifdef CONFIG_COREDUMP 2219 static int proc_dostring_coredump(struct ctl_table *table, int write, 2220 void __user *buffer, size_t *lenp, loff_t *ppos) 2221 { 2222 int error = proc_dostring(table, write, buffer, lenp, ppos); 2223 if (!error) 2224 validate_coredump_safety(); 2225 return error; 2226 } 2227 #endif 2228 2229 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2230 void __user *buffer, 2231 size_t *lenp, loff_t *ppos, 2232 unsigned long convmul, 2233 unsigned long convdiv) 2234 { 2235 unsigned long *i, *min, *max; 2236 int vleft, first = 1, err = 0; 2237 unsigned long page = 0; 2238 size_t left; 2239 char *kbuf; 2240 2241 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2242 *lenp = 0; 2243 return 0; 2244 } 2245 2246 i = (unsigned long *) data; 2247 min = (unsigned long *) table->extra1; 2248 max = (unsigned long *) table->extra2; 2249 vleft = table->maxlen / sizeof(unsigned long); 2250 left = *lenp; 2251 2252 if (write) { 2253 if (*ppos) { 2254 switch (sysctl_writes_strict) { 2255 case SYSCTL_WRITES_STRICT: 2256 goto out; 2257 case SYSCTL_WRITES_WARN: 2258 warn_sysctl_write(table); 2259 break; 2260 default: 2261 break; 2262 } 2263 } 2264 2265 if (left > PAGE_SIZE - 1) 2266 left = PAGE_SIZE - 1; 2267 page = __get_free_page(GFP_TEMPORARY); 2268 kbuf = (char *) page; 2269 if (!kbuf) 2270 return -ENOMEM; 2271 if (copy_from_user(kbuf, buffer, left)) { 2272 err = -EFAULT; 2273 goto free; 2274 } 2275 kbuf[left] = 0; 2276 } 2277 2278 for (; left && vleft--; i++, first = 0) { 2279 unsigned long val; 2280 2281 if (write) { 2282 bool neg; 2283 2284 left -= proc_skip_spaces(&kbuf); 2285 2286 err = proc_get_long(&kbuf, &left, &val, &neg, 2287 proc_wspace_sep, 2288 sizeof(proc_wspace_sep), NULL); 2289 if (err) 2290 break; 2291 if (neg) 2292 continue; 2293 if ((min && val < *min) || (max && val > *max)) 2294 continue; 2295 *i = val; 2296 } else { 2297 val = convdiv * (*i) / convmul; 2298 if (!first) { 2299 err = proc_put_char(&buffer, &left, '\t'); 2300 if (err) 2301 break; 2302 } 2303 err = proc_put_long(&buffer, &left, val, false); 2304 if (err) 2305 break; 2306 } 2307 } 2308 2309 if (!write && !first && left && !err) 2310 err = proc_put_char(&buffer, &left, '\n'); 2311 if (write && !err) 2312 left -= proc_skip_spaces(&kbuf); 2313 free: 2314 if (write) { 2315 free_page(page); 2316 if (first) 2317 return err ? : -EINVAL; 2318 } 2319 *lenp -= left; 2320 out: 2321 *ppos += *lenp; 2322 return err; 2323 } 2324 2325 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2326 void __user *buffer, 2327 size_t *lenp, loff_t *ppos, 2328 unsigned long convmul, 2329 unsigned long convdiv) 2330 { 2331 return __do_proc_doulongvec_minmax(table->data, table, write, 2332 buffer, lenp, ppos, convmul, convdiv); 2333 } 2334 2335 /** 2336 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2337 * @table: the sysctl table 2338 * @write: %TRUE if this is a write to the sysctl file 2339 * @buffer: the user buffer 2340 * @lenp: the size of the user buffer 2341 * @ppos: file position 2342 * 2343 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2344 * values from/to the user buffer, treated as an ASCII string. 2345 * 2346 * This routine will ensure the values are within the range specified by 2347 * table->extra1 (min) and table->extra2 (max). 2348 * 2349 * Returns 0 on success. 2350 */ 2351 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2352 void __user *buffer, size_t *lenp, loff_t *ppos) 2353 { 2354 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2355 } 2356 2357 /** 2358 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2359 * @table: the sysctl table 2360 * @write: %TRUE if this is a write to the sysctl file 2361 * @buffer: the user buffer 2362 * @lenp: the size of the user buffer 2363 * @ppos: file position 2364 * 2365 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2366 * values from/to the user buffer, treated as an ASCII string. The values 2367 * are treated as milliseconds, and converted to jiffies when they are stored. 2368 * 2369 * This routine will ensure the values are within the range specified by 2370 * table->extra1 (min) and table->extra2 (max). 2371 * 2372 * Returns 0 on success. 2373 */ 2374 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2375 void __user *buffer, 2376 size_t *lenp, loff_t *ppos) 2377 { 2378 return do_proc_doulongvec_minmax(table, write, buffer, 2379 lenp, ppos, HZ, 1000l); 2380 } 2381 2382 2383 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2384 int *valp, 2385 int write, void *data) 2386 { 2387 if (write) { 2388 if (*lvalp > LONG_MAX / HZ) 2389 return 1; 2390 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2391 } else { 2392 int val = *valp; 2393 unsigned long lval; 2394 if (val < 0) { 2395 *negp = true; 2396 lval = (unsigned long)-val; 2397 } else { 2398 *negp = false; 2399 lval = (unsigned long)val; 2400 } 2401 *lvalp = lval / HZ; 2402 } 2403 return 0; 2404 } 2405 2406 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2407 int *valp, 2408 int write, void *data) 2409 { 2410 if (write) { 2411 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2412 return 1; 2413 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2414 } else { 2415 int val = *valp; 2416 unsigned long lval; 2417 if (val < 0) { 2418 *negp = true; 2419 lval = (unsigned long)-val; 2420 } else { 2421 *negp = false; 2422 lval = (unsigned long)val; 2423 } 2424 *lvalp = jiffies_to_clock_t(lval); 2425 } 2426 return 0; 2427 } 2428 2429 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2430 int *valp, 2431 int write, void *data) 2432 { 2433 if (write) { 2434 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2435 2436 if (jif > INT_MAX) 2437 return 1; 2438 *valp = (int)jif; 2439 } else { 2440 int val = *valp; 2441 unsigned long lval; 2442 if (val < 0) { 2443 *negp = true; 2444 lval = (unsigned long)-val; 2445 } else { 2446 *negp = false; 2447 lval = (unsigned long)val; 2448 } 2449 *lvalp = jiffies_to_msecs(lval); 2450 } 2451 return 0; 2452 } 2453 2454 /** 2455 * proc_dointvec_jiffies - read a vector of integers as seconds 2456 * @table: the sysctl table 2457 * @write: %TRUE if this is a write to the sysctl file 2458 * @buffer: the user buffer 2459 * @lenp: the size of the user buffer 2460 * @ppos: file position 2461 * 2462 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2463 * values from/to the user buffer, treated as an ASCII string. 2464 * The values read are assumed to be in seconds, and are converted into 2465 * jiffies. 2466 * 2467 * Returns 0 on success. 2468 */ 2469 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2470 void __user *buffer, size_t *lenp, loff_t *ppos) 2471 { 2472 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2473 do_proc_dointvec_jiffies_conv,NULL); 2474 } 2475 2476 /** 2477 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2478 * @table: the sysctl table 2479 * @write: %TRUE if this is a write to the sysctl file 2480 * @buffer: the user buffer 2481 * @lenp: the size of the user buffer 2482 * @ppos: pointer to the file position 2483 * 2484 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2485 * values from/to the user buffer, treated as an ASCII string. 2486 * The values read are assumed to be in 1/USER_HZ seconds, and 2487 * are converted into jiffies. 2488 * 2489 * Returns 0 on success. 2490 */ 2491 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2492 void __user *buffer, size_t *lenp, loff_t *ppos) 2493 { 2494 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2495 do_proc_dointvec_userhz_jiffies_conv,NULL); 2496 } 2497 2498 /** 2499 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2500 * @table: the sysctl table 2501 * @write: %TRUE if this is a write to the sysctl file 2502 * @buffer: the user buffer 2503 * @lenp: the size of the user buffer 2504 * @ppos: file position 2505 * @ppos: the current position in the file 2506 * 2507 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2508 * values from/to the user buffer, treated as an ASCII string. 2509 * The values read are assumed to be in 1/1000 seconds, and 2510 * are converted into jiffies. 2511 * 2512 * Returns 0 on success. 2513 */ 2514 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2515 void __user *buffer, size_t *lenp, loff_t *ppos) 2516 { 2517 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2518 do_proc_dointvec_ms_jiffies_conv, NULL); 2519 } 2520 2521 static int proc_do_cad_pid(struct ctl_table *table, int write, 2522 void __user *buffer, size_t *lenp, loff_t *ppos) 2523 { 2524 struct pid *new_pid; 2525 pid_t tmp; 2526 int r; 2527 2528 tmp = pid_vnr(cad_pid); 2529 2530 r = __do_proc_dointvec(&tmp, table, write, buffer, 2531 lenp, ppos, NULL, NULL); 2532 if (r || !write) 2533 return r; 2534 2535 new_pid = find_get_pid(tmp); 2536 if (!new_pid) 2537 return -ESRCH; 2538 2539 put_pid(xchg(&cad_pid, new_pid)); 2540 return 0; 2541 } 2542 2543 /** 2544 * proc_do_large_bitmap - read/write from/to a large bitmap 2545 * @table: the sysctl table 2546 * @write: %TRUE if this is a write to the sysctl file 2547 * @buffer: the user buffer 2548 * @lenp: the size of the user buffer 2549 * @ppos: file position 2550 * 2551 * The bitmap is stored at table->data and the bitmap length (in bits) 2552 * in table->maxlen. 2553 * 2554 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2555 * large bitmaps may be represented in a compact manner. Writing into 2556 * the file will clear the bitmap then update it with the given input. 2557 * 2558 * Returns 0 on success. 2559 */ 2560 int proc_do_large_bitmap(struct ctl_table *table, int write, 2561 void __user *buffer, size_t *lenp, loff_t *ppos) 2562 { 2563 int err = 0; 2564 bool first = 1; 2565 size_t left = *lenp; 2566 unsigned long bitmap_len = table->maxlen; 2567 unsigned long *bitmap = *(unsigned long **) table->data; 2568 unsigned long *tmp_bitmap = NULL; 2569 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2570 2571 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2572 *lenp = 0; 2573 return 0; 2574 } 2575 2576 if (write) { 2577 unsigned long page = 0; 2578 char *kbuf; 2579 2580 if (left > PAGE_SIZE - 1) 2581 left = PAGE_SIZE - 1; 2582 2583 page = __get_free_page(GFP_TEMPORARY); 2584 kbuf = (char *) page; 2585 if (!kbuf) 2586 return -ENOMEM; 2587 if (copy_from_user(kbuf, buffer, left)) { 2588 free_page(page); 2589 return -EFAULT; 2590 } 2591 kbuf[left] = 0; 2592 2593 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2594 GFP_KERNEL); 2595 if (!tmp_bitmap) { 2596 free_page(page); 2597 return -ENOMEM; 2598 } 2599 proc_skip_char(&kbuf, &left, '\n'); 2600 while (!err && left) { 2601 unsigned long val_a, val_b; 2602 bool neg; 2603 2604 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2605 sizeof(tr_a), &c); 2606 if (err) 2607 break; 2608 if (val_a >= bitmap_len || neg) { 2609 err = -EINVAL; 2610 break; 2611 } 2612 2613 val_b = val_a; 2614 if (left) { 2615 kbuf++; 2616 left--; 2617 } 2618 2619 if (c == '-') { 2620 err = proc_get_long(&kbuf, &left, &val_b, 2621 &neg, tr_b, sizeof(tr_b), 2622 &c); 2623 if (err) 2624 break; 2625 if (val_b >= bitmap_len || neg || 2626 val_a > val_b) { 2627 err = -EINVAL; 2628 break; 2629 } 2630 if (left) { 2631 kbuf++; 2632 left--; 2633 } 2634 } 2635 2636 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2637 first = 0; 2638 proc_skip_char(&kbuf, &left, '\n'); 2639 } 2640 free_page(page); 2641 } else { 2642 unsigned long bit_a, bit_b = 0; 2643 2644 while (left) { 2645 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2646 if (bit_a >= bitmap_len) 2647 break; 2648 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2649 bit_a + 1) - 1; 2650 2651 if (!first) { 2652 err = proc_put_char(&buffer, &left, ','); 2653 if (err) 2654 break; 2655 } 2656 err = proc_put_long(&buffer, &left, bit_a, false); 2657 if (err) 2658 break; 2659 if (bit_a != bit_b) { 2660 err = proc_put_char(&buffer, &left, '-'); 2661 if (err) 2662 break; 2663 err = proc_put_long(&buffer, &left, bit_b, false); 2664 if (err) 2665 break; 2666 } 2667 2668 first = 0; bit_b++; 2669 } 2670 if (!err) 2671 err = proc_put_char(&buffer, &left, '\n'); 2672 } 2673 2674 if (!err) { 2675 if (write) { 2676 if (*ppos) 2677 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2678 else 2679 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2680 } 2681 kfree(tmp_bitmap); 2682 *lenp -= left; 2683 *ppos += *lenp; 2684 return 0; 2685 } else { 2686 kfree(tmp_bitmap); 2687 return err; 2688 } 2689 } 2690 2691 #else /* CONFIG_PROC_SYSCTL */ 2692 2693 int proc_dostring(struct ctl_table *table, int write, 2694 void __user *buffer, size_t *lenp, loff_t *ppos) 2695 { 2696 return -ENOSYS; 2697 } 2698 2699 int proc_dointvec(struct ctl_table *table, int write, 2700 void __user *buffer, size_t *lenp, loff_t *ppos) 2701 { 2702 return -ENOSYS; 2703 } 2704 2705 int proc_dointvec_minmax(struct ctl_table *table, int write, 2706 void __user *buffer, size_t *lenp, loff_t *ppos) 2707 { 2708 return -ENOSYS; 2709 } 2710 2711 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2712 void __user *buffer, size_t *lenp, loff_t *ppos) 2713 { 2714 return -ENOSYS; 2715 } 2716 2717 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2718 void __user *buffer, size_t *lenp, loff_t *ppos) 2719 { 2720 return -ENOSYS; 2721 } 2722 2723 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2724 void __user *buffer, size_t *lenp, loff_t *ppos) 2725 { 2726 return -ENOSYS; 2727 } 2728 2729 int proc_doulongvec_minmax(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_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2736 void __user *buffer, 2737 size_t *lenp, loff_t *ppos) 2738 { 2739 return -ENOSYS; 2740 } 2741 2742 2743 #endif /* CONFIG_PROC_SYSCTL */ 2744 2745 /* 2746 * No sense putting this after each symbol definition, twice, 2747 * exception granted :-) 2748 */ 2749 EXPORT_SYMBOL(proc_dointvec); 2750 EXPORT_SYMBOL(proc_dointvec_jiffies); 2751 EXPORT_SYMBOL(proc_dointvec_minmax); 2752 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2753 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2754 EXPORT_SYMBOL(proc_dostring); 2755 EXPORT_SYMBOL(proc_doulongvec_minmax); 2756 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2757