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