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 #ifdef CONFIG_BLOCK 116 extern int blk_iopoll_enabled; 117 #endif 118 119 /* Constants used for minimum and maximum */ 120 #ifdef CONFIG_LOCKUP_DETECTOR 121 static int sixty = 60; 122 #endif 123 124 static int __maybe_unused neg_one = -1; 125 126 static int zero; 127 static int __maybe_unused one = 1; 128 static int __maybe_unused two = 2; 129 static int __maybe_unused three = 3; 130 static unsigned long one_ul = 1; 131 static int one_hundred = 100; 132 #ifdef CONFIG_PRINTK 133 static int ten_thousand = 10000; 134 #endif 135 136 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 137 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 138 139 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 140 static int maxolduid = 65535; 141 static int minolduid; 142 static int min_percpu_pagelist_fract = 8; 143 144 static int ngroups_max = NGROUPS_MAX; 145 static const int cap_last_cap = CAP_LAST_CAP; 146 147 #ifdef CONFIG_INOTIFY_USER 148 #include <linux/inotify.h> 149 #endif 150 #ifdef CONFIG_SPARC 151 #endif 152 153 #ifdef CONFIG_SPARC64 154 extern int sysctl_tsb_ratio; 155 #endif 156 157 #ifdef __hppa__ 158 extern int pwrsw_enabled; 159 #endif 160 161 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 162 extern int unaligned_enabled; 163 #endif 164 165 #ifdef CONFIG_IA64 166 extern int unaligned_dump_stack; 167 #endif 168 169 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 170 extern int no_unaligned_warning; 171 #endif 172 173 #ifdef CONFIG_PROC_SYSCTL 174 static int proc_do_cad_pid(struct ctl_table *table, int write, 175 void __user *buffer, size_t *lenp, loff_t *ppos); 176 static int proc_taint(struct ctl_table *table, int write, 177 void __user *buffer, size_t *lenp, loff_t *ppos); 178 #endif 179 180 #ifdef CONFIG_PRINTK 181 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 182 void __user *buffer, size_t *lenp, loff_t *ppos); 183 #endif 184 185 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 186 void __user *buffer, size_t *lenp, loff_t *ppos); 187 #ifdef CONFIG_COREDUMP 188 static int proc_dostring_coredump(struct ctl_table *table, int write, 189 void __user *buffer, size_t *lenp, loff_t *ppos); 190 #endif 191 192 #ifdef CONFIG_MAGIC_SYSRQ 193 /* Note: sysrq code uses it's own private copy */ 194 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 195 196 static int sysrq_sysctl_handler(ctl_table *table, int write, 197 void __user *buffer, size_t *lenp, 198 loff_t *ppos) 199 { 200 int error; 201 202 error = proc_dointvec(table, write, buffer, lenp, ppos); 203 if (error) 204 return error; 205 206 if (write) 207 sysrq_toggle_support(__sysrq_enabled); 208 209 return 0; 210 } 211 212 #endif 213 214 static struct ctl_table kern_table[]; 215 static struct ctl_table vm_table[]; 216 static struct ctl_table fs_table[]; 217 static struct ctl_table debug_table[]; 218 static struct ctl_table dev_table[]; 219 extern struct ctl_table random_table[]; 220 #ifdef CONFIG_EPOLL 221 extern struct ctl_table epoll_table[]; 222 #endif 223 224 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 225 int sysctl_legacy_va_layout; 226 #endif 227 228 /* The default sysctl tables: */ 229 230 static struct ctl_table sysctl_base_table[] = { 231 { 232 .procname = "kernel", 233 .mode = 0555, 234 .child = kern_table, 235 }, 236 { 237 .procname = "vm", 238 .mode = 0555, 239 .child = vm_table, 240 }, 241 { 242 .procname = "fs", 243 .mode = 0555, 244 .child = fs_table, 245 }, 246 { 247 .procname = "debug", 248 .mode = 0555, 249 .child = debug_table, 250 }, 251 { 252 .procname = "dev", 253 .mode = 0555, 254 .child = dev_table, 255 }, 256 { } 257 }; 258 259 #ifdef CONFIG_SCHED_DEBUG 260 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 261 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 262 static int min_wakeup_granularity_ns; /* 0 usecs */ 263 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 264 #ifdef CONFIG_SMP 265 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 266 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 267 #endif /* CONFIG_SMP */ 268 #endif /* CONFIG_SCHED_DEBUG */ 269 270 #ifdef CONFIG_COMPACTION 271 static int min_extfrag_threshold; 272 static int max_extfrag_threshold = 1000; 273 #endif 274 275 static struct ctl_table kern_table[] = { 276 { 277 .procname = "sched_child_runs_first", 278 .data = &sysctl_sched_child_runs_first, 279 .maxlen = sizeof(unsigned int), 280 .mode = 0644, 281 .proc_handler = proc_dointvec, 282 }, 283 #ifdef CONFIG_SCHED_DEBUG 284 { 285 .procname = "sched_min_granularity_ns", 286 .data = &sysctl_sched_min_granularity, 287 .maxlen = sizeof(unsigned int), 288 .mode = 0644, 289 .proc_handler = sched_proc_update_handler, 290 .extra1 = &min_sched_granularity_ns, 291 .extra2 = &max_sched_granularity_ns, 292 }, 293 { 294 .procname = "sched_latency_ns", 295 .data = &sysctl_sched_latency, 296 .maxlen = sizeof(unsigned int), 297 .mode = 0644, 298 .proc_handler = sched_proc_update_handler, 299 .extra1 = &min_sched_granularity_ns, 300 .extra2 = &max_sched_granularity_ns, 301 }, 302 { 303 .procname = "sched_wakeup_granularity_ns", 304 .data = &sysctl_sched_wakeup_granularity, 305 .maxlen = sizeof(unsigned int), 306 .mode = 0644, 307 .proc_handler = sched_proc_update_handler, 308 .extra1 = &min_wakeup_granularity_ns, 309 .extra2 = &max_wakeup_granularity_ns, 310 }, 311 #ifdef CONFIG_SMP 312 { 313 .procname = "sched_tunable_scaling", 314 .data = &sysctl_sched_tunable_scaling, 315 .maxlen = sizeof(enum sched_tunable_scaling), 316 .mode = 0644, 317 .proc_handler = sched_proc_update_handler, 318 .extra1 = &min_sched_tunable_scaling, 319 .extra2 = &max_sched_tunable_scaling, 320 }, 321 { 322 .procname = "sched_migration_cost_ns", 323 .data = &sysctl_sched_migration_cost, 324 .maxlen = sizeof(unsigned int), 325 .mode = 0644, 326 .proc_handler = proc_dointvec, 327 }, 328 { 329 .procname = "sched_nr_migrate", 330 .data = &sysctl_sched_nr_migrate, 331 .maxlen = sizeof(unsigned int), 332 .mode = 0644, 333 .proc_handler = proc_dointvec, 334 }, 335 { 336 .procname = "sched_time_avg_ms", 337 .data = &sysctl_sched_time_avg, 338 .maxlen = sizeof(unsigned int), 339 .mode = 0644, 340 .proc_handler = proc_dointvec, 341 }, 342 { 343 .procname = "sched_shares_window_ns", 344 .data = &sysctl_sched_shares_window, 345 .maxlen = sizeof(unsigned int), 346 .mode = 0644, 347 .proc_handler = proc_dointvec, 348 }, 349 { 350 .procname = "timer_migration", 351 .data = &sysctl_timer_migration, 352 .maxlen = sizeof(unsigned int), 353 .mode = 0644, 354 .proc_handler = proc_dointvec_minmax, 355 .extra1 = &zero, 356 .extra2 = &one, 357 }, 358 #endif /* CONFIG_SMP */ 359 #ifdef CONFIG_NUMA_BALANCING 360 { 361 .procname = "numa_balancing_scan_delay_ms", 362 .data = &sysctl_numa_balancing_scan_delay, 363 .maxlen = sizeof(unsigned int), 364 .mode = 0644, 365 .proc_handler = proc_dointvec, 366 }, 367 { 368 .procname = "numa_balancing_scan_period_min_ms", 369 .data = &sysctl_numa_balancing_scan_period_min, 370 .maxlen = sizeof(unsigned int), 371 .mode = 0644, 372 .proc_handler = proc_dointvec, 373 }, 374 { 375 .procname = "numa_balancing_scan_period_max_ms", 376 .data = &sysctl_numa_balancing_scan_period_max, 377 .maxlen = sizeof(unsigned int), 378 .mode = 0644, 379 .proc_handler = proc_dointvec, 380 }, 381 { 382 .procname = "numa_balancing_scan_size_mb", 383 .data = &sysctl_numa_balancing_scan_size, 384 .maxlen = sizeof(unsigned int), 385 .mode = 0644, 386 .proc_handler = proc_dointvec, 387 }, 388 { 389 .procname = "numa_balancing_migrate_deferred", 390 .data = &sysctl_numa_balancing_migrate_deferred, 391 .maxlen = sizeof(unsigned int), 392 .mode = 0644, 393 .proc_handler = proc_dointvec, 394 }, 395 { 396 .procname = "numa_balancing", 397 .data = NULL, /* filled in by handler */ 398 .maxlen = sizeof(unsigned int), 399 .mode = 0644, 400 .proc_handler = sysctl_numa_balancing, 401 .extra1 = &zero, 402 .extra2 = &one, 403 }, 404 #endif /* CONFIG_NUMA_BALANCING */ 405 #endif /* CONFIG_SCHED_DEBUG */ 406 { 407 .procname = "sched_rt_period_us", 408 .data = &sysctl_sched_rt_period, 409 .maxlen = sizeof(unsigned int), 410 .mode = 0644, 411 .proc_handler = sched_rt_handler, 412 }, 413 { 414 .procname = "sched_rt_runtime_us", 415 .data = &sysctl_sched_rt_runtime, 416 .maxlen = sizeof(int), 417 .mode = 0644, 418 .proc_handler = sched_rt_handler, 419 }, 420 { 421 .procname = "sched_rr_timeslice_ms", 422 .data = &sched_rr_timeslice, 423 .maxlen = sizeof(int), 424 .mode = 0644, 425 .proc_handler = sched_rr_handler, 426 }, 427 #ifdef CONFIG_SCHED_AUTOGROUP 428 { 429 .procname = "sched_autogroup_enabled", 430 .data = &sysctl_sched_autogroup_enabled, 431 .maxlen = sizeof(unsigned int), 432 .mode = 0644, 433 .proc_handler = proc_dointvec_minmax, 434 .extra1 = &zero, 435 .extra2 = &one, 436 }, 437 #endif 438 #ifdef CONFIG_CFS_BANDWIDTH 439 { 440 .procname = "sched_cfs_bandwidth_slice_us", 441 .data = &sysctl_sched_cfs_bandwidth_slice, 442 .maxlen = sizeof(unsigned int), 443 .mode = 0644, 444 .proc_handler = proc_dointvec_minmax, 445 .extra1 = &one, 446 }, 447 #endif 448 #ifdef CONFIG_PROVE_LOCKING 449 { 450 .procname = "prove_locking", 451 .data = &prove_locking, 452 .maxlen = sizeof(int), 453 .mode = 0644, 454 .proc_handler = proc_dointvec, 455 }, 456 #endif 457 #ifdef CONFIG_LOCK_STAT 458 { 459 .procname = "lock_stat", 460 .data = &lock_stat, 461 .maxlen = sizeof(int), 462 .mode = 0644, 463 .proc_handler = proc_dointvec, 464 }, 465 #endif 466 { 467 .procname = "panic", 468 .data = &panic_timeout, 469 .maxlen = sizeof(int), 470 .mode = 0644, 471 .proc_handler = proc_dointvec, 472 }, 473 #ifdef CONFIG_COREDUMP 474 { 475 .procname = "core_uses_pid", 476 .data = &core_uses_pid, 477 .maxlen = sizeof(int), 478 .mode = 0644, 479 .proc_handler = proc_dointvec, 480 }, 481 { 482 .procname = "core_pattern", 483 .data = core_pattern, 484 .maxlen = CORENAME_MAX_SIZE, 485 .mode = 0644, 486 .proc_handler = proc_dostring_coredump, 487 }, 488 { 489 .procname = "core_pipe_limit", 490 .data = &core_pipe_limit, 491 .maxlen = sizeof(unsigned int), 492 .mode = 0644, 493 .proc_handler = proc_dointvec, 494 }, 495 #endif 496 #ifdef CONFIG_PROC_SYSCTL 497 { 498 .procname = "tainted", 499 .maxlen = sizeof(long), 500 .mode = 0644, 501 .proc_handler = proc_taint, 502 }, 503 #endif 504 #ifdef CONFIG_LATENCYTOP 505 { 506 .procname = "latencytop", 507 .data = &latencytop_enabled, 508 .maxlen = sizeof(int), 509 .mode = 0644, 510 .proc_handler = proc_dointvec, 511 }, 512 #endif 513 #ifdef CONFIG_BLK_DEV_INITRD 514 { 515 .procname = "real-root-dev", 516 .data = &real_root_dev, 517 .maxlen = sizeof(int), 518 .mode = 0644, 519 .proc_handler = proc_dointvec, 520 }, 521 #endif 522 { 523 .procname = "print-fatal-signals", 524 .data = &print_fatal_signals, 525 .maxlen = sizeof(int), 526 .mode = 0644, 527 .proc_handler = proc_dointvec, 528 }, 529 #ifdef CONFIG_SPARC 530 { 531 .procname = "reboot-cmd", 532 .data = reboot_command, 533 .maxlen = 256, 534 .mode = 0644, 535 .proc_handler = proc_dostring, 536 }, 537 { 538 .procname = "stop-a", 539 .data = &stop_a_enabled, 540 .maxlen = sizeof (int), 541 .mode = 0644, 542 .proc_handler = proc_dointvec, 543 }, 544 { 545 .procname = "scons-poweroff", 546 .data = &scons_pwroff, 547 .maxlen = sizeof (int), 548 .mode = 0644, 549 .proc_handler = proc_dointvec, 550 }, 551 #endif 552 #ifdef CONFIG_SPARC64 553 { 554 .procname = "tsb-ratio", 555 .data = &sysctl_tsb_ratio, 556 .maxlen = sizeof (int), 557 .mode = 0644, 558 .proc_handler = proc_dointvec, 559 }, 560 #endif 561 #ifdef __hppa__ 562 { 563 .procname = "soft-power", 564 .data = &pwrsw_enabled, 565 .maxlen = sizeof (int), 566 .mode = 0644, 567 .proc_handler = proc_dointvec, 568 }, 569 #endif 570 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 571 { 572 .procname = "unaligned-trap", 573 .data = &unaligned_enabled, 574 .maxlen = sizeof (int), 575 .mode = 0644, 576 .proc_handler = proc_dointvec, 577 }, 578 #endif 579 { 580 .procname = "ctrl-alt-del", 581 .data = &C_A_D, 582 .maxlen = sizeof(int), 583 .mode = 0644, 584 .proc_handler = proc_dointvec, 585 }, 586 #ifdef CONFIG_FUNCTION_TRACER 587 { 588 .procname = "ftrace_enabled", 589 .data = &ftrace_enabled, 590 .maxlen = sizeof(int), 591 .mode = 0644, 592 .proc_handler = ftrace_enable_sysctl, 593 }, 594 #endif 595 #ifdef CONFIG_STACK_TRACER 596 { 597 .procname = "stack_tracer_enabled", 598 .data = &stack_tracer_enabled, 599 .maxlen = sizeof(int), 600 .mode = 0644, 601 .proc_handler = stack_trace_sysctl, 602 }, 603 #endif 604 #ifdef CONFIG_TRACING 605 { 606 .procname = "ftrace_dump_on_oops", 607 .data = &ftrace_dump_on_oops, 608 .maxlen = sizeof(int), 609 .mode = 0644, 610 .proc_handler = proc_dointvec, 611 }, 612 { 613 .procname = "traceoff_on_warning", 614 .data = &__disable_trace_on_warning, 615 .maxlen = sizeof(__disable_trace_on_warning), 616 .mode = 0644, 617 .proc_handler = proc_dointvec, 618 }, 619 #endif 620 #ifdef CONFIG_KEXEC 621 { 622 .procname = "kexec_load_disabled", 623 .data = &kexec_load_disabled, 624 .maxlen = sizeof(int), 625 .mode = 0644, 626 /* only handle a transition from default "0" to "1" */ 627 .proc_handler = proc_dointvec_minmax, 628 .extra1 = &one, 629 .extra2 = &one, 630 }, 631 #endif 632 #ifdef CONFIG_MODULES 633 { 634 .procname = "modprobe", 635 .data = &modprobe_path, 636 .maxlen = KMOD_PATH_LEN, 637 .mode = 0644, 638 .proc_handler = proc_dostring, 639 }, 640 { 641 .procname = "modules_disabled", 642 .data = &modules_disabled, 643 .maxlen = sizeof(int), 644 .mode = 0644, 645 /* only handle a transition from default "0" to "1" */ 646 .proc_handler = proc_dointvec_minmax, 647 .extra1 = &one, 648 .extra2 = &one, 649 }, 650 #endif 651 652 { 653 .procname = "hotplug", 654 .data = &uevent_helper, 655 .maxlen = UEVENT_HELPER_PATH_LEN, 656 .mode = 0644, 657 .proc_handler = proc_dostring, 658 }, 659 660 #ifdef CONFIG_CHR_DEV_SG 661 { 662 .procname = "sg-big-buff", 663 .data = &sg_big_buff, 664 .maxlen = sizeof (int), 665 .mode = 0444, 666 .proc_handler = proc_dointvec, 667 }, 668 #endif 669 #ifdef CONFIG_BSD_PROCESS_ACCT 670 { 671 .procname = "acct", 672 .data = &acct_parm, 673 .maxlen = 3*sizeof(int), 674 .mode = 0644, 675 .proc_handler = proc_dointvec, 676 }, 677 #endif 678 #ifdef CONFIG_MAGIC_SYSRQ 679 { 680 .procname = "sysrq", 681 .data = &__sysrq_enabled, 682 .maxlen = sizeof (int), 683 .mode = 0644, 684 .proc_handler = sysrq_sysctl_handler, 685 }, 686 #endif 687 #ifdef CONFIG_PROC_SYSCTL 688 { 689 .procname = "cad_pid", 690 .data = NULL, 691 .maxlen = sizeof (int), 692 .mode = 0600, 693 .proc_handler = proc_do_cad_pid, 694 }, 695 #endif 696 { 697 .procname = "threads-max", 698 .data = &max_threads, 699 .maxlen = sizeof(int), 700 .mode = 0644, 701 .proc_handler = proc_dointvec, 702 }, 703 { 704 .procname = "random", 705 .mode = 0555, 706 .child = random_table, 707 }, 708 { 709 .procname = "usermodehelper", 710 .mode = 0555, 711 .child = usermodehelper_table, 712 }, 713 { 714 .procname = "overflowuid", 715 .data = &overflowuid, 716 .maxlen = sizeof(int), 717 .mode = 0644, 718 .proc_handler = proc_dointvec_minmax, 719 .extra1 = &minolduid, 720 .extra2 = &maxolduid, 721 }, 722 { 723 .procname = "overflowgid", 724 .data = &overflowgid, 725 .maxlen = sizeof(int), 726 .mode = 0644, 727 .proc_handler = proc_dointvec_minmax, 728 .extra1 = &minolduid, 729 .extra2 = &maxolduid, 730 }, 731 #ifdef CONFIG_S390 732 #ifdef CONFIG_MATHEMU 733 { 734 .procname = "ieee_emulation_warnings", 735 .data = &sysctl_ieee_emulation_warnings, 736 .maxlen = sizeof(int), 737 .mode = 0644, 738 .proc_handler = proc_dointvec, 739 }, 740 #endif 741 { 742 .procname = "userprocess_debug", 743 .data = &show_unhandled_signals, 744 .maxlen = sizeof(int), 745 .mode = 0644, 746 .proc_handler = proc_dointvec, 747 }, 748 #endif 749 { 750 .procname = "pid_max", 751 .data = &pid_max, 752 .maxlen = sizeof (int), 753 .mode = 0644, 754 .proc_handler = proc_dointvec_minmax, 755 .extra1 = &pid_max_min, 756 .extra2 = &pid_max_max, 757 }, 758 { 759 .procname = "panic_on_oops", 760 .data = &panic_on_oops, 761 .maxlen = sizeof(int), 762 .mode = 0644, 763 .proc_handler = proc_dointvec, 764 }, 765 #if defined CONFIG_PRINTK 766 { 767 .procname = "printk", 768 .data = &console_loglevel, 769 .maxlen = 4*sizeof(int), 770 .mode = 0644, 771 .proc_handler = proc_dointvec, 772 }, 773 { 774 .procname = "printk_ratelimit", 775 .data = &printk_ratelimit_state.interval, 776 .maxlen = sizeof(int), 777 .mode = 0644, 778 .proc_handler = proc_dointvec_jiffies, 779 }, 780 { 781 .procname = "printk_ratelimit_burst", 782 .data = &printk_ratelimit_state.burst, 783 .maxlen = sizeof(int), 784 .mode = 0644, 785 .proc_handler = proc_dointvec, 786 }, 787 { 788 .procname = "printk_delay", 789 .data = &printk_delay_msec, 790 .maxlen = sizeof(int), 791 .mode = 0644, 792 .proc_handler = proc_dointvec_minmax, 793 .extra1 = &zero, 794 .extra2 = &ten_thousand, 795 }, 796 { 797 .procname = "dmesg_restrict", 798 .data = &dmesg_restrict, 799 .maxlen = sizeof(int), 800 .mode = 0644, 801 .proc_handler = proc_dointvec_minmax_sysadmin, 802 .extra1 = &zero, 803 .extra2 = &one, 804 }, 805 { 806 .procname = "kptr_restrict", 807 .data = &kptr_restrict, 808 .maxlen = sizeof(int), 809 .mode = 0644, 810 .proc_handler = proc_dointvec_minmax_sysadmin, 811 .extra1 = &zero, 812 .extra2 = &two, 813 }, 814 #endif 815 { 816 .procname = "ngroups_max", 817 .data = &ngroups_max, 818 .maxlen = sizeof (int), 819 .mode = 0444, 820 .proc_handler = proc_dointvec, 821 }, 822 { 823 .procname = "cap_last_cap", 824 .data = (void *)&cap_last_cap, 825 .maxlen = sizeof(int), 826 .mode = 0444, 827 .proc_handler = proc_dointvec, 828 }, 829 #if defined(CONFIG_LOCKUP_DETECTOR) 830 { 831 .procname = "watchdog", 832 .data = &watchdog_user_enabled, 833 .maxlen = sizeof (int), 834 .mode = 0644, 835 .proc_handler = proc_dowatchdog, 836 .extra1 = &zero, 837 .extra2 = &one, 838 }, 839 { 840 .procname = "watchdog_thresh", 841 .data = &watchdog_thresh, 842 .maxlen = sizeof(int), 843 .mode = 0644, 844 .proc_handler = proc_dowatchdog, 845 .extra1 = &zero, 846 .extra2 = &sixty, 847 }, 848 { 849 .procname = "softlockup_panic", 850 .data = &softlockup_panic, 851 .maxlen = sizeof(int), 852 .mode = 0644, 853 .proc_handler = proc_dointvec_minmax, 854 .extra1 = &zero, 855 .extra2 = &one, 856 }, 857 { 858 .procname = "nmi_watchdog", 859 .data = &watchdog_user_enabled, 860 .maxlen = sizeof (int), 861 .mode = 0644, 862 .proc_handler = proc_dowatchdog, 863 .extra1 = &zero, 864 .extra2 = &one, 865 }, 866 #endif 867 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 868 { 869 .procname = "unknown_nmi_panic", 870 .data = &unknown_nmi_panic, 871 .maxlen = sizeof (int), 872 .mode = 0644, 873 .proc_handler = proc_dointvec, 874 }, 875 #endif 876 #if defined(CONFIG_X86) 877 { 878 .procname = "panic_on_unrecovered_nmi", 879 .data = &panic_on_unrecovered_nmi, 880 .maxlen = sizeof(int), 881 .mode = 0644, 882 .proc_handler = proc_dointvec, 883 }, 884 { 885 .procname = "panic_on_io_nmi", 886 .data = &panic_on_io_nmi, 887 .maxlen = sizeof(int), 888 .mode = 0644, 889 .proc_handler = proc_dointvec, 890 }, 891 #ifdef CONFIG_DEBUG_STACKOVERFLOW 892 { 893 .procname = "panic_on_stackoverflow", 894 .data = &sysctl_panic_on_stackoverflow, 895 .maxlen = sizeof(int), 896 .mode = 0644, 897 .proc_handler = proc_dointvec, 898 }, 899 #endif 900 { 901 .procname = "bootloader_type", 902 .data = &bootloader_type, 903 .maxlen = sizeof (int), 904 .mode = 0444, 905 .proc_handler = proc_dointvec, 906 }, 907 { 908 .procname = "bootloader_version", 909 .data = &bootloader_version, 910 .maxlen = sizeof (int), 911 .mode = 0444, 912 .proc_handler = proc_dointvec, 913 }, 914 { 915 .procname = "kstack_depth_to_print", 916 .data = &kstack_depth_to_print, 917 .maxlen = sizeof(int), 918 .mode = 0644, 919 .proc_handler = proc_dointvec, 920 }, 921 { 922 .procname = "io_delay_type", 923 .data = &io_delay_type, 924 .maxlen = sizeof(int), 925 .mode = 0644, 926 .proc_handler = proc_dointvec, 927 }, 928 #endif 929 #if defined(CONFIG_MMU) 930 { 931 .procname = "randomize_va_space", 932 .data = &randomize_va_space, 933 .maxlen = sizeof(int), 934 .mode = 0644, 935 .proc_handler = proc_dointvec, 936 }, 937 #endif 938 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 939 { 940 .procname = "spin_retry", 941 .data = &spin_retry, 942 .maxlen = sizeof (int), 943 .mode = 0644, 944 .proc_handler = proc_dointvec, 945 }, 946 #endif 947 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 948 { 949 .procname = "acpi_video_flags", 950 .data = &acpi_realmode_flags, 951 .maxlen = sizeof (unsigned long), 952 .mode = 0644, 953 .proc_handler = proc_doulongvec_minmax, 954 }, 955 #endif 956 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 957 { 958 .procname = "ignore-unaligned-usertrap", 959 .data = &no_unaligned_warning, 960 .maxlen = sizeof (int), 961 .mode = 0644, 962 .proc_handler = proc_dointvec, 963 }, 964 #endif 965 #ifdef CONFIG_IA64 966 { 967 .procname = "unaligned-dump-stack", 968 .data = &unaligned_dump_stack, 969 .maxlen = sizeof (int), 970 .mode = 0644, 971 .proc_handler = proc_dointvec, 972 }, 973 #endif 974 #ifdef CONFIG_DETECT_HUNG_TASK 975 { 976 .procname = "hung_task_panic", 977 .data = &sysctl_hung_task_panic, 978 .maxlen = sizeof(int), 979 .mode = 0644, 980 .proc_handler = proc_dointvec_minmax, 981 .extra1 = &zero, 982 .extra2 = &one, 983 }, 984 { 985 .procname = "hung_task_check_count", 986 .data = &sysctl_hung_task_check_count, 987 .maxlen = sizeof(int), 988 .mode = 0644, 989 .proc_handler = proc_dointvec_minmax, 990 .extra1 = &zero, 991 }, 992 { 993 .procname = "hung_task_timeout_secs", 994 .data = &sysctl_hung_task_timeout_secs, 995 .maxlen = sizeof(unsigned long), 996 .mode = 0644, 997 .proc_handler = proc_dohung_task_timeout_secs, 998 }, 999 { 1000 .procname = "hung_task_warnings", 1001 .data = &sysctl_hung_task_warnings, 1002 .maxlen = sizeof(int), 1003 .mode = 0644, 1004 .proc_handler = proc_dointvec_minmax, 1005 .extra1 = &neg_one, 1006 }, 1007 #endif 1008 #ifdef CONFIG_COMPAT 1009 { 1010 .procname = "compat-log", 1011 .data = &compat_log, 1012 .maxlen = sizeof (int), 1013 .mode = 0644, 1014 .proc_handler = proc_dointvec, 1015 }, 1016 #endif 1017 #ifdef CONFIG_RT_MUTEXES 1018 { 1019 .procname = "max_lock_depth", 1020 .data = &max_lock_depth, 1021 .maxlen = sizeof(int), 1022 .mode = 0644, 1023 .proc_handler = proc_dointvec, 1024 }, 1025 #endif 1026 { 1027 .procname = "poweroff_cmd", 1028 .data = &poweroff_cmd, 1029 .maxlen = POWEROFF_CMD_PATH_LEN, 1030 .mode = 0644, 1031 .proc_handler = proc_dostring, 1032 }, 1033 #ifdef CONFIG_KEYS 1034 { 1035 .procname = "keys", 1036 .mode = 0555, 1037 .child = key_sysctls, 1038 }, 1039 #endif 1040 #ifdef CONFIG_RCU_TORTURE_TEST 1041 { 1042 .procname = "rcutorture_runnable", 1043 .data = &rcutorture_runnable, 1044 .maxlen = sizeof(int), 1045 .mode = 0644, 1046 .proc_handler = proc_dointvec, 1047 }, 1048 #endif 1049 #ifdef CONFIG_PERF_EVENTS 1050 /* 1051 * User-space scripts rely on the existence of this file 1052 * as a feature check for perf_events being enabled. 1053 * 1054 * So it's an ABI, do not remove! 1055 */ 1056 { 1057 .procname = "perf_event_paranoid", 1058 .data = &sysctl_perf_event_paranoid, 1059 .maxlen = sizeof(sysctl_perf_event_paranoid), 1060 .mode = 0644, 1061 .proc_handler = proc_dointvec, 1062 }, 1063 { 1064 .procname = "perf_event_mlock_kb", 1065 .data = &sysctl_perf_event_mlock, 1066 .maxlen = sizeof(sysctl_perf_event_mlock), 1067 .mode = 0644, 1068 .proc_handler = proc_dointvec, 1069 }, 1070 { 1071 .procname = "perf_event_max_sample_rate", 1072 .data = &sysctl_perf_event_sample_rate, 1073 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1074 .mode = 0644, 1075 .proc_handler = perf_proc_update_handler, 1076 .extra1 = &one, 1077 }, 1078 { 1079 .procname = "perf_cpu_time_max_percent", 1080 .data = &sysctl_perf_cpu_time_max_percent, 1081 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1082 .mode = 0644, 1083 .proc_handler = perf_cpu_time_max_percent_handler, 1084 .extra1 = &zero, 1085 .extra2 = &one_hundred, 1086 }, 1087 #endif 1088 #ifdef CONFIG_KMEMCHECK 1089 { 1090 .procname = "kmemcheck", 1091 .data = &kmemcheck_enabled, 1092 .maxlen = sizeof(int), 1093 .mode = 0644, 1094 .proc_handler = proc_dointvec, 1095 }, 1096 #endif 1097 #ifdef CONFIG_BLOCK 1098 { 1099 .procname = "blk_iopoll", 1100 .data = &blk_iopoll_enabled, 1101 .maxlen = sizeof(int), 1102 .mode = 0644, 1103 .proc_handler = proc_dointvec, 1104 }, 1105 #endif 1106 { } 1107 }; 1108 1109 static struct ctl_table vm_table[] = { 1110 { 1111 .procname = "overcommit_memory", 1112 .data = &sysctl_overcommit_memory, 1113 .maxlen = sizeof(sysctl_overcommit_memory), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec_minmax, 1116 .extra1 = &zero, 1117 .extra2 = &two, 1118 }, 1119 { 1120 .procname = "panic_on_oom", 1121 .data = &sysctl_panic_on_oom, 1122 .maxlen = sizeof(sysctl_panic_on_oom), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec_minmax, 1125 .extra1 = &zero, 1126 .extra2 = &two, 1127 }, 1128 { 1129 .procname = "oom_kill_allocating_task", 1130 .data = &sysctl_oom_kill_allocating_task, 1131 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1132 .mode = 0644, 1133 .proc_handler = proc_dointvec, 1134 }, 1135 { 1136 .procname = "oom_dump_tasks", 1137 .data = &sysctl_oom_dump_tasks, 1138 .maxlen = sizeof(sysctl_oom_dump_tasks), 1139 .mode = 0644, 1140 .proc_handler = proc_dointvec, 1141 }, 1142 { 1143 .procname = "overcommit_ratio", 1144 .data = &sysctl_overcommit_ratio, 1145 .maxlen = sizeof(sysctl_overcommit_ratio), 1146 .mode = 0644, 1147 .proc_handler = overcommit_ratio_handler, 1148 }, 1149 { 1150 .procname = "overcommit_kbytes", 1151 .data = &sysctl_overcommit_kbytes, 1152 .maxlen = sizeof(sysctl_overcommit_kbytes), 1153 .mode = 0644, 1154 .proc_handler = overcommit_kbytes_handler, 1155 }, 1156 { 1157 .procname = "page-cluster", 1158 .data = &page_cluster, 1159 .maxlen = sizeof(int), 1160 .mode = 0644, 1161 .proc_handler = proc_dointvec_minmax, 1162 .extra1 = &zero, 1163 }, 1164 { 1165 .procname = "dirty_background_ratio", 1166 .data = &dirty_background_ratio, 1167 .maxlen = sizeof(dirty_background_ratio), 1168 .mode = 0644, 1169 .proc_handler = dirty_background_ratio_handler, 1170 .extra1 = &zero, 1171 .extra2 = &one_hundred, 1172 }, 1173 { 1174 .procname = "dirty_background_bytes", 1175 .data = &dirty_background_bytes, 1176 .maxlen = sizeof(dirty_background_bytes), 1177 .mode = 0644, 1178 .proc_handler = dirty_background_bytes_handler, 1179 .extra1 = &one_ul, 1180 }, 1181 { 1182 .procname = "dirty_ratio", 1183 .data = &vm_dirty_ratio, 1184 .maxlen = sizeof(vm_dirty_ratio), 1185 .mode = 0644, 1186 .proc_handler = dirty_ratio_handler, 1187 .extra1 = &zero, 1188 .extra2 = &one_hundred, 1189 }, 1190 { 1191 .procname = "dirty_bytes", 1192 .data = &vm_dirty_bytes, 1193 .maxlen = sizeof(vm_dirty_bytes), 1194 .mode = 0644, 1195 .proc_handler = dirty_bytes_handler, 1196 .extra1 = &dirty_bytes_min, 1197 }, 1198 { 1199 .procname = "dirty_writeback_centisecs", 1200 .data = &dirty_writeback_interval, 1201 .maxlen = sizeof(dirty_writeback_interval), 1202 .mode = 0644, 1203 .proc_handler = dirty_writeback_centisecs_handler, 1204 }, 1205 { 1206 .procname = "dirty_expire_centisecs", 1207 .data = &dirty_expire_interval, 1208 .maxlen = sizeof(dirty_expire_interval), 1209 .mode = 0644, 1210 .proc_handler = proc_dointvec_minmax, 1211 .extra1 = &zero, 1212 }, 1213 { 1214 .procname = "nr_pdflush_threads", 1215 .mode = 0444 /* read-only */, 1216 .proc_handler = pdflush_proc_obsolete, 1217 }, 1218 { 1219 .procname = "swappiness", 1220 .data = &vm_swappiness, 1221 .maxlen = sizeof(vm_swappiness), 1222 .mode = 0644, 1223 .proc_handler = proc_dointvec_minmax, 1224 .extra1 = &zero, 1225 .extra2 = &one_hundred, 1226 }, 1227 #ifdef CONFIG_HUGETLB_PAGE 1228 { 1229 .procname = "nr_hugepages", 1230 .data = NULL, 1231 .maxlen = sizeof(unsigned long), 1232 .mode = 0644, 1233 .proc_handler = hugetlb_sysctl_handler, 1234 .extra1 = (void *)&hugetlb_zero, 1235 .extra2 = (void *)&hugetlb_infinity, 1236 }, 1237 #ifdef CONFIG_NUMA 1238 { 1239 .procname = "nr_hugepages_mempolicy", 1240 .data = NULL, 1241 .maxlen = sizeof(unsigned long), 1242 .mode = 0644, 1243 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1244 .extra1 = (void *)&hugetlb_zero, 1245 .extra2 = (void *)&hugetlb_infinity, 1246 }, 1247 #endif 1248 { 1249 .procname = "hugetlb_shm_group", 1250 .data = &sysctl_hugetlb_shm_group, 1251 .maxlen = sizeof(gid_t), 1252 .mode = 0644, 1253 .proc_handler = proc_dointvec, 1254 }, 1255 { 1256 .procname = "hugepages_treat_as_movable", 1257 .data = &hugepages_treat_as_movable, 1258 .maxlen = sizeof(int), 1259 .mode = 0644, 1260 .proc_handler = proc_dointvec, 1261 }, 1262 { 1263 .procname = "nr_overcommit_hugepages", 1264 .data = NULL, 1265 .maxlen = sizeof(unsigned long), 1266 .mode = 0644, 1267 .proc_handler = hugetlb_overcommit_handler, 1268 .extra1 = (void *)&hugetlb_zero, 1269 .extra2 = (void *)&hugetlb_infinity, 1270 }, 1271 #endif 1272 { 1273 .procname = "lowmem_reserve_ratio", 1274 .data = &sysctl_lowmem_reserve_ratio, 1275 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1276 .mode = 0644, 1277 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1278 }, 1279 { 1280 .procname = "drop_caches", 1281 .data = &sysctl_drop_caches, 1282 .maxlen = sizeof(int), 1283 .mode = 0644, 1284 .proc_handler = drop_caches_sysctl_handler, 1285 .extra1 = &one, 1286 .extra2 = &three, 1287 }, 1288 #ifdef CONFIG_COMPACTION 1289 { 1290 .procname = "compact_memory", 1291 .data = &sysctl_compact_memory, 1292 .maxlen = sizeof(int), 1293 .mode = 0200, 1294 .proc_handler = sysctl_compaction_handler, 1295 }, 1296 { 1297 .procname = "extfrag_threshold", 1298 .data = &sysctl_extfrag_threshold, 1299 .maxlen = sizeof(int), 1300 .mode = 0644, 1301 .proc_handler = sysctl_extfrag_handler, 1302 .extra1 = &min_extfrag_threshold, 1303 .extra2 = &max_extfrag_threshold, 1304 }, 1305 1306 #endif /* CONFIG_COMPACTION */ 1307 { 1308 .procname = "min_free_kbytes", 1309 .data = &min_free_kbytes, 1310 .maxlen = sizeof(min_free_kbytes), 1311 .mode = 0644, 1312 .proc_handler = min_free_kbytes_sysctl_handler, 1313 .extra1 = &zero, 1314 }, 1315 { 1316 .procname = "percpu_pagelist_fraction", 1317 .data = &percpu_pagelist_fraction, 1318 .maxlen = sizeof(percpu_pagelist_fraction), 1319 .mode = 0644, 1320 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1321 .extra1 = &min_percpu_pagelist_fract, 1322 }, 1323 #ifdef CONFIG_MMU 1324 { 1325 .procname = "max_map_count", 1326 .data = &sysctl_max_map_count, 1327 .maxlen = sizeof(sysctl_max_map_count), 1328 .mode = 0644, 1329 .proc_handler = proc_dointvec_minmax, 1330 .extra1 = &zero, 1331 }, 1332 #else 1333 { 1334 .procname = "nr_trim_pages", 1335 .data = &sysctl_nr_trim_pages, 1336 .maxlen = sizeof(sysctl_nr_trim_pages), 1337 .mode = 0644, 1338 .proc_handler = proc_dointvec_minmax, 1339 .extra1 = &zero, 1340 }, 1341 #endif 1342 { 1343 .procname = "laptop_mode", 1344 .data = &laptop_mode, 1345 .maxlen = sizeof(laptop_mode), 1346 .mode = 0644, 1347 .proc_handler = proc_dointvec_jiffies, 1348 }, 1349 { 1350 .procname = "block_dump", 1351 .data = &block_dump, 1352 .maxlen = sizeof(block_dump), 1353 .mode = 0644, 1354 .proc_handler = proc_dointvec, 1355 .extra1 = &zero, 1356 }, 1357 { 1358 .procname = "vfs_cache_pressure", 1359 .data = &sysctl_vfs_cache_pressure, 1360 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1361 .mode = 0644, 1362 .proc_handler = proc_dointvec, 1363 .extra1 = &zero, 1364 }, 1365 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1366 { 1367 .procname = "legacy_va_layout", 1368 .data = &sysctl_legacy_va_layout, 1369 .maxlen = sizeof(sysctl_legacy_va_layout), 1370 .mode = 0644, 1371 .proc_handler = proc_dointvec, 1372 .extra1 = &zero, 1373 }, 1374 #endif 1375 #ifdef CONFIG_NUMA 1376 { 1377 .procname = "zone_reclaim_mode", 1378 .data = &zone_reclaim_mode, 1379 .maxlen = sizeof(zone_reclaim_mode), 1380 .mode = 0644, 1381 .proc_handler = proc_dointvec, 1382 .extra1 = &zero, 1383 }, 1384 { 1385 .procname = "min_unmapped_ratio", 1386 .data = &sysctl_min_unmapped_ratio, 1387 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1388 .mode = 0644, 1389 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1390 .extra1 = &zero, 1391 .extra2 = &one_hundred, 1392 }, 1393 { 1394 .procname = "min_slab_ratio", 1395 .data = &sysctl_min_slab_ratio, 1396 .maxlen = sizeof(sysctl_min_slab_ratio), 1397 .mode = 0644, 1398 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1399 .extra1 = &zero, 1400 .extra2 = &one_hundred, 1401 }, 1402 #endif 1403 #ifdef CONFIG_SMP 1404 { 1405 .procname = "stat_interval", 1406 .data = &sysctl_stat_interval, 1407 .maxlen = sizeof(sysctl_stat_interval), 1408 .mode = 0644, 1409 .proc_handler = proc_dointvec_jiffies, 1410 }, 1411 #endif 1412 #ifdef CONFIG_MMU 1413 { 1414 .procname = "mmap_min_addr", 1415 .data = &dac_mmap_min_addr, 1416 .maxlen = sizeof(unsigned long), 1417 .mode = 0644, 1418 .proc_handler = mmap_min_addr_handler, 1419 }, 1420 #endif 1421 #ifdef CONFIG_NUMA 1422 { 1423 .procname = "numa_zonelist_order", 1424 .data = &numa_zonelist_order, 1425 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1426 .mode = 0644, 1427 .proc_handler = numa_zonelist_order_handler, 1428 }, 1429 #endif 1430 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1431 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1432 { 1433 .procname = "vdso_enabled", 1434 .data = &vdso_enabled, 1435 .maxlen = sizeof(vdso_enabled), 1436 .mode = 0644, 1437 .proc_handler = proc_dointvec, 1438 .extra1 = &zero, 1439 }, 1440 #endif 1441 #ifdef CONFIG_HIGHMEM 1442 { 1443 .procname = "highmem_is_dirtyable", 1444 .data = &vm_highmem_is_dirtyable, 1445 .maxlen = sizeof(vm_highmem_is_dirtyable), 1446 .mode = 0644, 1447 .proc_handler = proc_dointvec_minmax, 1448 .extra1 = &zero, 1449 .extra2 = &one, 1450 }, 1451 #endif 1452 { 1453 .procname = "scan_unevictable_pages", 1454 .data = &scan_unevictable_pages, 1455 .maxlen = sizeof(scan_unevictable_pages), 1456 .mode = 0644, 1457 .proc_handler = scan_unevictable_handler, 1458 }, 1459 #ifdef CONFIG_MEMORY_FAILURE 1460 { 1461 .procname = "memory_failure_early_kill", 1462 .data = &sysctl_memory_failure_early_kill, 1463 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1464 .mode = 0644, 1465 .proc_handler = proc_dointvec_minmax, 1466 .extra1 = &zero, 1467 .extra2 = &one, 1468 }, 1469 { 1470 .procname = "memory_failure_recovery", 1471 .data = &sysctl_memory_failure_recovery, 1472 .maxlen = sizeof(sysctl_memory_failure_recovery), 1473 .mode = 0644, 1474 .proc_handler = proc_dointvec_minmax, 1475 .extra1 = &zero, 1476 .extra2 = &one, 1477 }, 1478 #endif 1479 { 1480 .procname = "user_reserve_kbytes", 1481 .data = &sysctl_user_reserve_kbytes, 1482 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1483 .mode = 0644, 1484 .proc_handler = proc_doulongvec_minmax, 1485 }, 1486 { 1487 .procname = "admin_reserve_kbytes", 1488 .data = &sysctl_admin_reserve_kbytes, 1489 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1490 .mode = 0644, 1491 .proc_handler = proc_doulongvec_minmax, 1492 }, 1493 { } 1494 }; 1495 1496 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1497 static struct ctl_table binfmt_misc_table[] = { 1498 { } 1499 }; 1500 #endif 1501 1502 static struct ctl_table fs_table[] = { 1503 { 1504 .procname = "inode-nr", 1505 .data = &inodes_stat, 1506 .maxlen = 2*sizeof(long), 1507 .mode = 0444, 1508 .proc_handler = proc_nr_inodes, 1509 }, 1510 { 1511 .procname = "inode-state", 1512 .data = &inodes_stat, 1513 .maxlen = 7*sizeof(long), 1514 .mode = 0444, 1515 .proc_handler = proc_nr_inodes, 1516 }, 1517 { 1518 .procname = "file-nr", 1519 .data = &files_stat, 1520 .maxlen = sizeof(files_stat), 1521 .mode = 0444, 1522 .proc_handler = proc_nr_files, 1523 }, 1524 { 1525 .procname = "file-max", 1526 .data = &files_stat.max_files, 1527 .maxlen = sizeof(files_stat.max_files), 1528 .mode = 0644, 1529 .proc_handler = proc_doulongvec_minmax, 1530 }, 1531 { 1532 .procname = "nr_open", 1533 .data = &sysctl_nr_open, 1534 .maxlen = sizeof(int), 1535 .mode = 0644, 1536 .proc_handler = proc_dointvec_minmax, 1537 .extra1 = &sysctl_nr_open_min, 1538 .extra2 = &sysctl_nr_open_max, 1539 }, 1540 { 1541 .procname = "dentry-state", 1542 .data = &dentry_stat, 1543 .maxlen = 6*sizeof(long), 1544 .mode = 0444, 1545 .proc_handler = proc_nr_dentry, 1546 }, 1547 { 1548 .procname = "overflowuid", 1549 .data = &fs_overflowuid, 1550 .maxlen = sizeof(int), 1551 .mode = 0644, 1552 .proc_handler = proc_dointvec_minmax, 1553 .extra1 = &minolduid, 1554 .extra2 = &maxolduid, 1555 }, 1556 { 1557 .procname = "overflowgid", 1558 .data = &fs_overflowgid, 1559 .maxlen = sizeof(int), 1560 .mode = 0644, 1561 .proc_handler = proc_dointvec_minmax, 1562 .extra1 = &minolduid, 1563 .extra2 = &maxolduid, 1564 }, 1565 #ifdef CONFIG_FILE_LOCKING 1566 { 1567 .procname = "leases-enable", 1568 .data = &leases_enable, 1569 .maxlen = sizeof(int), 1570 .mode = 0644, 1571 .proc_handler = proc_dointvec, 1572 }, 1573 #endif 1574 #ifdef CONFIG_DNOTIFY 1575 { 1576 .procname = "dir-notify-enable", 1577 .data = &dir_notify_enable, 1578 .maxlen = sizeof(int), 1579 .mode = 0644, 1580 .proc_handler = proc_dointvec, 1581 }, 1582 #endif 1583 #ifdef CONFIG_MMU 1584 #ifdef CONFIG_FILE_LOCKING 1585 { 1586 .procname = "lease-break-time", 1587 .data = &lease_break_time, 1588 .maxlen = sizeof(int), 1589 .mode = 0644, 1590 .proc_handler = proc_dointvec, 1591 }, 1592 #endif 1593 #ifdef CONFIG_AIO 1594 { 1595 .procname = "aio-nr", 1596 .data = &aio_nr, 1597 .maxlen = sizeof(aio_nr), 1598 .mode = 0444, 1599 .proc_handler = proc_doulongvec_minmax, 1600 }, 1601 { 1602 .procname = "aio-max-nr", 1603 .data = &aio_max_nr, 1604 .maxlen = sizeof(aio_max_nr), 1605 .mode = 0644, 1606 .proc_handler = proc_doulongvec_minmax, 1607 }, 1608 #endif /* CONFIG_AIO */ 1609 #ifdef CONFIG_INOTIFY_USER 1610 { 1611 .procname = "inotify", 1612 .mode = 0555, 1613 .child = inotify_table, 1614 }, 1615 #endif 1616 #ifdef CONFIG_EPOLL 1617 { 1618 .procname = "epoll", 1619 .mode = 0555, 1620 .child = epoll_table, 1621 }, 1622 #endif 1623 #endif 1624 { 1625 .procname = "protected_symlinks", 1626 .data = &sysctl_protected_symlinks, 1627 .maxlen = sizeof(int), 1628 .mode = 0600, 1629 .proc_handler = proc_dointvec_minmax, 1630 .extra1 = &zero, 1631 .extra2 = &one, 1632 }, 1633 { 1634 .procname = "protected_hardlinks", 1635 .data = &sysctl_protected_hardlinks, 1636 .maxlen = sizeof(int), 1637 .mode = 0600, 1638 .proc_handler = proc_dointvec_minmax, 1639 .extra1 = &zero, 1640 .extra2 = &one, 1641 }, 1642 { 1643 .procname = "suid_dumpable", 1644 .data = &suid_dumpable, 1645 .maxlen = sizeof(int), 1646 .mode = 0644, 1647 .proc_handler = proc_dointvec_minmax_coredump, 1648 .extra1 = &zero, 1649 .extra2 = &two, 1650 }, 1651 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1652 { 1653 .procname = "binfmt_misc", 1654 .mode = 0555, 1655 .child = binfmt_misc_table, 1656 }, 1657 #endif 1658 { 1659 .procname = "pipe-max-size", 1660 .data = &pipe_max_size, 1661 .maxlen = sizeof(int), 1662 .mode = 0644, 1663 .proc_handler = &pipe_proc_fn, 1664 .extra1 = &pipe_min_size, 1665 }, 1666 { } 1667 }; 1668 1669 static struct ctl_table debug_table[] = { 1670 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1671 { 1672 .procname = "exception-trace", 1673 .data = &show_unhandled_signals, 1674 .maxlen = sizeof(int), 1675 .mode = 0644, 1676 .proc_handler = proc_dointvec 1677 }, 1678 #endif 1679 #if defined(CONFIG_OPTPROBES) 1680 { 1681 .procname = "kprobes-optimization", 1682 .data = &sysctl_kprobes_optimization, 1683 .maxlen = sizeof(int), 1684 .mode = 0644, 1685 .proc_handler = proc_kprobes_optimization_handler, 1686 .extra1 = &zero, 1687 .extra2 = &one, 1688 }, 1689 #endif 1690 { } 1691 }; 1692 1693 static struct ctl_table dev_table[] = { 1694 { } 1695 }; 1696 1697 int __init sysctl_init(void) 1698 { 1699 struct ctl_table_header *hdr; 1700 1701 hdr = register_sysctl_table(sysctl_base_table); 1702 kmemleak_not_leak(hdr); 1703 return 0; 1704 } 1705 1706 #endif /* CONFIG_SYSCTL */ 1707 1708 /* 1709 * /proc/sys support 1710 */ 1711 1712 #ifdef CONFIG_PROC_SYSCTL 1713 1714 static int _proc_do_string(void* data, int maxlen, int write, 1715 void __user *buffer, 1716 size_t *lenp, loff_t *ppos) 1717 { 1718 size_t len; 1719 char __user *p; 1720 char c; 1721 1722 if (!data || !maxlen || !*lenp) { 1723 *lenp = 0; 1724 return 0; 1725 } 1726 1727 if (write) { 1728 len = 0; 1729 p = buffer; 1730 while (len < *lenp) { 1731 if (get_user(c, p++)) 1732 return -EFAULT; 1733 if (c == 0 || c == '\n') 1734 break; 1735 len++; 1736 } 1737 if (len >= maxlen) 1738 len = maxlen-1; 1739 if(copy_from_user(data, buffer, len)) 1740 return -EFAULT; 1741 ((char *) data)[len] = 0; 1742 *ppos += *lenp; 1743 } else { 1744 len = strlen(data); 1745 if (len > maxlen) 1746 len = maxlen; 1747 1748 if (*ppos > len) { 1749 *lenp = 0; 1750 return 0; 1751 } 1752 1753 data += *ppos; 1754 len -= *ppos; 1755 1756 if (len > *lenp) 1757 len = *lenp; 1758 if (len) 1759 if(copy_to_user(buffer, data, len)) 1760 return -EFAULT; 1761 if (len < *lenp) { 1762 if(put_user('\n', ((char __user *) buffer) + len)) 1763 return -EFAULT; 1764 len++; 1765 } 1766 *lenp = len; 1767 *ppos += len; 1768 } 1769 return 0; 1770 } 1771 1772 /** 1773 * proc_dostring - read a string sysctl 1774 * @table: the sysctl table 1775 * @write: %TRUE if this is a write to the sysctl file 1776 * @buffer: the user buffer 1777 * @lenp: the size of the user buffer 1778 * @ppos: file position 1779 * 1780 * Reads/writes a string from/to the user buffer. If the kernel 1781 * buffer provided is not large enough to hold the string, the 1782 * string is truncated. The copied string is %NULL-terminated. 1783 * If the string is being read by the user process, it is copied 1784 * and a newline '\n' is added. It is truncated if the buffer is 1785 * not large enough. 1786 * 1787 * Returns 0 on success. 1788 */ 1789 int proc_dostring(struct ctl_table *table, int write, 1790 void __user *buffer, size_t *lenp, loff_t *ppos) 1791 { 1792 return _proc_do_string(table->data, table->maxlen, write, 1793 buffer, lenp, ppos); 1794 } 1795 1796 static size_t proc_skip_spaces(char **buf) 1797 { 1798 size_t ret; 1799 char *tmp = skip_spaces(*buf); 1800 ret = tmp - *buf; 1801 *buf = tmp; 1802 return ret; 1803 } 1804 1805 static void proc_skip_char(char **buf, size_t *size, const char v) 1806 { 1807 while (*size) { 1808 if (**buf != v) 1809 break; 1810 (*size)--; 1811 (*buf)++; 1812 } 1813 } 1814 1815 #define TMPBUFLEN 22 1816 /** 1817 * proc_get_long - reads an ASCII formatted integer from a user buffer 1818 * 1819 * @buf: a kernel buffer 1820 * @size: size of the kernel buffer 1821 * @val: this is where the number will be stored 1822 * @neg: set to %TRUE if number is negative 1823 * @perm_tr: a vector which contains the allowed trailers 1824 * @perm_tr_len: size of the perm_tr vector 1825 * @tr: pointer to store the trailer character 1826 * 1827 * In case of success %0 is returned and @buf and @size are updated with 1828 * the amount of bytes read. If @tr is non-NULL and a trailing 1829 * character exists (size is non-zero after returning from this 1830 * function), @tr is updated with the trailing character. 1831 */ 1832 static int proc_get_long(char **buf, size_t *size, 1833 unsigned long *val, bool *neg, 1834 const char *perm_tr, unsigned perm_tr_len, char *tr) 1835 { 1836 int len; 1837 char *p, tmp[TMPBUFLEN]; 1838 1839 if (!*size) 1840 return -EINVAL; 1841 1842 len = *size; 1843 if (len > TMPBUFLEN - 1) 1844 len = TMPBUFLEN - 1; 1845 1846 memcpy(tmp, *buf, len); 1847 1848 tmp[len] = 0; 1849 p = tmp; 1850 if (*p == '-' && *size > 1) { 1851 *neg = true; 1852 p++; 1853 } else 1854 *neg = false; 1855 if (!isdigit(*p)) 1856 return -EINVAL; 1857 1858 *val = simple_strtoul(p, &p, 0); 1859 1860 len = p - tmp; 1861 1862 /* We don't know if the next char is whitespace thus we may accept 1863 * invalid integers (e.g. 1234...a) or two integers instead of one 1864 * (e.g. 123...1). So lets not allow such large numbers. */ 1865 if (len == TMPBUFLEN - 1) 1866 return -EINVAL; 1867 1868 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1869 return -EINVAL; 1870 1871 if (tr && (len < *size)) 1872 *tr = *p; 1873 1874 *buf += len; 1875 *size -= len; 1876 1877 return 0; 1878 } 1879 1880 /** 1881 * proc_put_long - converts an integer to a decimal ASCII formatted string 1882 * 1883 * @buf: the user buffer 1884 * @size: the size of the user buffer 1885 * @val: the integer to be converted 1886 * @neg: sign of the number, %TRUE for negative 1887 * 1888 * In case of success %0 is returned and @buf and @size are updated with 1889 * the amount of bytes written. 1890 */ 1891 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1892 bool neg) 1893 { 1894 int len; 1895 char tmp[TMPBUFLEN], *p = tmp; 1896 1897 sprintf(p, "%s%lu", neg ? "-" : "", val); 1898 len = strlen(tmp); 1899 if (len > *size) 1900 len = *size; 1901 if (copy_to_user(*buf, tmp, len)) 1902 return -EFAULT; 1903 *size -= len; 1904 *buf += len; 1905 return 0; 1906 } 1907 #undef TMPBUFLEN 1908 1909 static int proc_put_char(void __user **buf, size_t *size, char c) 1910 { 1911 if (*size) { 1912 char __user **buffer = (char __user **)buf; 1913 if (put_user(c, *buffer)) 1914 return -EFAULT; 1915 (*size)--, (*buffer)++; 1916 *buf = *buffer; 1917 } 1918 return 0; 1919 } 1920 1921 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1922 int *valp, 1923 int write, void *data) 1924 { 1925 if (write) { 1926 *valp = *negp ? -*lvalp : *lvalp; 1927 } else { 1928 int val = *valp; 1929 if (val < 0) { 1930 *negp = true; 1931 *lvalp = (unsigned long)-val; 1932 } else { 1933 *negp = false; 1934 *lvalp = (unsigned long)val; 1935 } 1936 } 1937 return 0; 1938 } 1939 1940 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1941 1942 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1943 int write, void __user *buffer, 1944 size_t *lenp, loff_t *ppos, 1945 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1946 int write, void *data), 1947 void *data) 1948 { 1949 int *i, vleft, first = 1, err = 0; 1950 unsigned long page = 0; 1951 size_t left; 1952 char *kbuf; 1953 1954 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1955 *lenp = 0; 1956 return 0; 1957 } 1958 1959 i = (int *) tbl_data; 1960 vleft = table->maxlen / sizeof(*i); 1961 left = *lenp; 1962 1963 if (!conv) 1964 conv = do_proc_dointvec_conv; 1965 1966 if (write) { 1967 if (left > PAGE_SIZE - 1) 1968 left = PAGE_SIZE - 1; 1969 page = __get_free_page(GFP_TEMPORARY); 1970 kbuf = (char *) page; 1971 if (!kbuf) 1972 return -ENOMEM; 1973 if (copy_from_user(kbuf, buffer, left)) { 1974 err = -EFAULT; 1975 goto free; 1976 } 1977 kbuf[left] = 0; 1978 } 1979 1980 for (; left && vleft--; i++, first=0) { 1981 unsigned long lval; 1982 bool neg; 1983 1984 if (write) { 1985 left -= proc_skip_spaces(&kbuf); 1986 1987 if (!left) 1988 break; 1989 err = proc_get_long(&kbuf, &left, &lval, &neg, 1990 proc_wspace_sep, 1991 sizeof(proc_wspace_sep), NULL); 1992 if (err) 1993 break; 1994 if (conv(&neg, &lval, i, 1, data)) { 1995 err = -EINVAL; 1996 break; 1997 } 1998 } else { 1999 if (conv(&neg, &lval, i, 0, data)) { 2000 err = -EINVAL; 2001 break; 2002 } 2003 if (!first) 2004 err = proc_put_char(&buffer, &left, '\t'); 2005 if (err) 2006 break; 2007 err = proc_put_long(&buffer, &left, lval, neg); 2008 if (err) 2009 break; 2010 } 2011 } 2012 2013 if (!write && !first && left && !err) 2014 err = proc_put_char(&buffer, &left, '\n'); 2015 if (write && !err && left) 2016 left -= proc_skip_spaces(&kbuf); 2017 free: 2018 if (write) { 2019 free_page(page); 2020 if (first) 2021 return err ? : -EINVAL; 2022 } 2023 *lenp -= left; 2024 *ppos += *lenp; 2025 return err; 2026 } 2027 2028 static int do_proc_dointvec(struct ctl_table *table, int write, 2029 void __user *buffer, size_t *lenp, loff_t *ppos, 2030 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2031 int write, void *data), 2032 void *data) 2033 { 2034 return __do_proc_dointvec(table->data, table, write, 2035 buffer, lenp, ppos, conv, data); 2036 } 2037 2038 /** 2039 * proc_dointvec - read a vector of integers 2040 * @table: the sysctl table 2041 * @write: %TRUE if this is a write to the sysctl file 2042 * @buffer: the user buffer 2043 * @lenp: the size of the user buffer 2044 * @ppos: file position 2045 * 2046 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2047 * values from/to the user buffer, treated as an ASCII string. 2048 * 2049 * Returns 0 on success. 2050 */ 2051 int proc_dointvec(struct ctl_table *table, int write, 2052 void __user *buffer, size_t *lenp, loff_t *ppos) 2053 { 2054 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2055 NULL,NULL); 2056 } 2057 2058 /* 2059 * Taint values can only be increased 2060 * This means we can safely use a temporary. 2061 */ 2062 static int proc_taint(struct ctl_table *table, int write, 2063 void __user *buffer, size_t *lenp, loff_t *ppos) 2064 { 2065 struct ctl_table t; 2066 unsigned long tmptaint = get_taint(); 2067 int err; 2068 2069 if (write && !capable(CAP_SYS_ADMIN)) 2070 return -EPERM; 2071 2072 t = *table; 2073 t.data = &tmptaint; 2074 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2075 if (err < 0) 2076 return err; 2077 2078 if (write) { 2079 /* 2080 * Poor man's atomic or. Not worth adding a primitive 2081 * to everyone's atomic.h for this 2082 */ 2083 int i; 2084 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2085 if ((tmptaint >> i) & 1) 2086 add_taint(i, LOCKDEP_STILL_OK); 2087 } 2088 } 2089 2090 return err; 2091 } 2092 2093 #ifdef CONFIG_PRINTK 2094 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2095 void __user *buffer, size_t *lenp, loff_t *ppos) 2096 { 2097 if (write && !capable(CAP_SYS_ADMIN)) 2098 return -EPERM; 2099 2100 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2101 } 2102 #endif 2103 2104 struct do_proc_dointvec_minmax_conv_param { 2105 int *min; 2106 int *max; 2107 }; 2108 2109 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2110 int *valp, 2111 int write, void *data) 2112 { 2113 struct do_proc_dointvec_minmax_conv_param *param = data; 2114 if (write) { 2115 int val = *negp ? -*lvalp : *lvalp; 2116 if ((param->min && *param->min > val) || 2117 (param->max && *param->max < val)) 2118 return -EINVAL; 2119 *valp = val; 2120 } else { 2121 int val = *valp; 2122 if (val < 0) { 2123 *negp = true; 2124 *lvalp = (unsigned long)-val; 2125 } else { 2126 *negp = false; 2127 *lvalp = (unsigned long)val; 2128 } 2129 } 2130 return 0; 2131 } 2132 2133 /** 2134 * proc_dointvec_minmax - read a vector of integers with min/max values 2135 * @table: the sysctl table 2136 * @write: %TRUE if this is a write to the sysctl file 2137 * @buffer: the user buffer 2138 * @lenp: the size of the user buffer 2139 * @ppos: file position 2140 * 2141 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2142 * values from/to the user buffer, treated as an ASCII string. 2143 * 2144 * This routine will ensure the values are within the range specified by 2145 * table->extra1 (min) and table->extra2 (max). 2146 * 2147 * Returns 0 on success. 2148 */ 2149 int proc_dointvec_minmax(struct ctl_table *table, int write, 2150 void __user *buffer, size_t *lenp, loff_t *ppos) 2151 { 2152 struct do_proc_dointvec_minmax_conv_param param = { 2153 .min = (int *) table->extra1, 2154 .max = (int *) table->extra2, 2155 }; 2156 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2157 do_proc_dointvec_minmax_conv, ¶m); 2158 } 2159 2160 static void validate_coredump_safety(void) 2161 { 2162 #ifdef CONFIG_COREDUMP 2163 if (suid_dumpable == SUID_DUMP_ROOT && 2164 core_pattern[0] != '/' && core_pattern[0] != '|') { 2165 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2166 "suid_dumpable=2. Pipe handler or fully qualified "\ 2167 "core dump path required.\n"); 2168 } 2169 #endif 2170 } 2171 2172 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2173 void __user *buffer, size_t *lenp, loff_t *ppos) 2174 { 2175 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2176 if (!error) 2177 validate_coredump_safety(); 2178 return error; 2179 } 2180 2181 #ifdef CONFIG_COREDUMP 2182 static int proc_dostring_coredump(struct ctl_table *table, int write, 2183 void __user *buffer, size_t *lenp, loff_t *ppos) 2184 { 2185 int error = proc_dostring(table, write, buffer, lenp, ppos); 2186 if (!error) 2187 validate_coredump_safety(); 2188 return error; 2189 } 2190 #endif 2191 2192 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2193 void __user *buffer, 2194 size_t *lenp, loff_t *ppos, 2195 unsigned long convmul, 2196 unsigned long convdiv) 2197 { 2198 unsigned long *i, *min, *max; 2199 int vleft, first = 1, err = 0; 2200 unsigned long page = 0; 2201 size_t left; 2202 char *kbuf; 2203 2204 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2205 *lenp = 0; 2206 return 0; 2207 } 2208 2209 i = (unsigned long *) data; 2210 min = (unsigned long *) table->extra1; 2211 max = (unsigned long *) table->extra2; 2212 vleft = table->maxlen / sizeof(unsigned long); 2213 left = *lenp; 2214 2215 if (write) { 2216 if (left > PAGE_SIZE - 1) 2217 left = PAGE_SIZE - 1; 2218 page = __get_free_page(GFP_TEMPORARY); 2219 kbuf = (char *) page; 2220 if (!kbuf) 2221 return -ENOMEM; 2222 if (copy_from_user(kbuf, buffer, left)) { 2223 err = -EFAULT; 2224 goto free; 2225 } 2226 kbuf[left] = 0; 2227 } 2228 2229 for (; left && vleft--; i++, first = 0) { 2230 unsigned long val; 2231 2232 if (write) { 2233 bool neg; 2234 2235 left -= proc_skip_spaces(&kbuf); 2236 2237 err = proc_get_long(&kbuf, &left, &val, &neg, 2238 proc_wspace_sep, 2239 sizeof(proc_wspace_sep), NULL); 2240 if (err) 2241 break; 2242 if (neg) 2243 continue; 2244 if ((min && val < *min) || (max && val > *max)) 2245 continue; 2246 *i = val; 2247 } else { 2248 val = convdiv * (*i) / convmul; 2249 if (!first) { 2250 err = proc_put_char(&buffer, &left, '\t'); 2251 if (err) 2252 break; 2253 } 2254 err = proc_put_long(&buffer, &left, val, false); 2255 if (err) 2256 break; 2257 } 2258 } 2259 2260 if (!write && !first && left && !err) 2261 err = proc_put_char(&buffer, &left, '\n'); 2262 if (write && !err) 2263 left -= proc_skip_spaces(&kbuf); 2264 free: 2265 if (write) { 2266 free_page(page); 2267 if (first) 2268 return err ? : -EINVAL; 2269 } 2270 *lenp -= left; 2271 *ppos += *lenp; 2272 return err; 2273 } 2274 2275 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2276 void __user *buffer, 2277 size_t *lenp, loff_t *ppos, 2278 unsigned long convmul, 2279 unsigned long convdiv) 2280 { 2281 return __do_proc_doulongvec_minmax(table->data, table, write, 2282 buffer, lenp, ppos, convmul, convdiv); 2283 } 2284 2285 /** 2286 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2287 * @table: the sysctl table 2288 * @write: %TRUE if this is a write to the sysctl file 2289 * @buffer: the user buffer 2290 * @lenp: the size of the user buffer 2291 * @ppos: file position 2292 * 2293 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2294 * values from/to the user buffer, treated as an ASCII string. 2295 * 2296 * This routine will ensure the values are within the range specified by 2297 * table->extra1 (min) and table->extra2 (max). 2298 * 2299 * Returns 0 on success. 2300 */ 2301 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2302 void __user *buffer, size_t *lenp, loff_t *ppos) 2303 { 2304 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2305 } 2306 2307 /** 2308 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2309 * @table: the sysctl table 2310 * @write: %TRUE if this is a write to the sysctl file 2311 * @buffer: the user buffer 2312 * @lenp: the size of the user buffer 2313 * @ppos: file position 2314 * 2315 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2316 * values from/to the user buffer, treated as an ASCII string. The values 2317 * are treated as milliseconds, and converted to jiffies when they are stored. 2318 * 2319 * This routine will ensure the values are within the range specified by 2320 * table->extra1 (min) and table->extra2 (max). 2321 * 2322 * Returns 0 on success. 2323 */ 2324 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2325 void __user *buffer, 2326 size_t *lenp, loff_t *ppos) 2327 { 2328 return do_proc_doulongvec_minmax(table, write, buffer, 2329 lenp, ppos, HZ, 1000l); 2330 } 2331 2332 2333 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2334 int *valp, 2335 int write, void *data) 2336 { 2337 if (write) { 2338 if (*lvalp > LONG_MAX / HZ) 2339 return 1; 2340 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2341 } else { 2342 int val = *valp; 2343 unsigned long lval; 2344 if (val < 0) { 2345 *negp = true; 2346 lval = (unsigned long)-val; 2347 } else { 2348 *negp = false; 2349 lval = (unsigned long)val; 2350 } 2351 *lvalp = lval / HZ; 2352 } 2353 return 0; 2354 } 2355 2356 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2357 int *valp, 2358 int write, void *data) 2359 { 2360 if (write) { 2361 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2362 return 1; 2363 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2364 } else { 2365 int val = *valp; 2366 unsigned long lval; 2367 if (val < 0) { 2368 *negp = true; 2369 lval = (unsigned long)-val; 2370 } else { 2371 *negp = false; 2372 lval = (unsigned long)val; 2373 } 2374 *lvalp = jiffies_to_clock_t(lval); 2375 } 2376 return 0; 2377 } 2378 2379 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2380 int *valp, 2381 int write, void *data) 2382 { 2383 if (write) { 2384 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2385 2386 if (jif > INT_MAX) 2387 return 1; 2388 *valp = (int)jif; 2389 } else { 2390 int val = *valp; 2391 unsigned long lval; 2392 if (val < 0) { 2393 *negp = true; 2394 lval = (unsigned long)-val; 2395 } else { 2396 *negp = false; 2397 lval = (unsigned long)val; 2398 } 2399 *lvalp = jiffies_to_msecs(lval); 2400 } 2401 return 0; 2402 } 2403 2404 /** 2405 * proc_dointvec_jiffies - read a vector of integers as seconds 2406 * @table: the sysctl table 2407 * @write: %TRUE if this is a write to the sysctl file 2408 * @buffer: the user buffer 2409 * @lenp: the size of the user buffer 2410 * @ppos: file position 2411 * 2412 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2413 * values from/to the user buffer, treated as an ASCII string. 2414 * The values read are assumed to be in seconds, and are converted into 2415 * jiffies. 2416 * 2417 * Returns 0 on success. 2418 */ 2419 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2420 void __user *buffer, size_t *lenp, loff_t *ppos) 2421 { 2422 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2423 do_proc_dointvec_jiffies_conv,NULL); 2424 } 2425 2426 /** 2427 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2428 * @table: the sysctl table 2429 * @write: %TRUE if this is a write to the sysctl file 2430 * @buffer: the user buffer 2431 * @lenp: the size of the user buffer 2432 * @ppos: pointer to the file position 2433 * 2434 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2435 * values from/to the user buffer, treated as an ASCII string. 2436 * The values read are assumed to be in 1/USER_HZ seconds, and 2437 * are converted into jiffies. 2438 * 2439 * Returns 0 on success. 2440 */ 2441 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2442 void __user *buffer, size_t *lenp, loff_t *ppos) 2443 { 2444 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2445 do_proc_dointvec_userhz_jiffies_conv,NULL); 2446 } 2447 2448 /** 2449 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2450 * @table: the sysctl table 2451 * @write: %TRUE if this is a write to the sysctl file 2452 * @buffer: the user buffer 2453 * @lenp: the size of the user buffer 2454 * @ppos: file position 2455 * @ppos: the current position in the file 2456 * 2457 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2458 * values from/to the user buffer, treated as an ASCII string. 2459 * The values read are assumed to be in 1/1000 seconds, and 2460 * are converted into jiffies. 2461 * 2462 * Returns 0 on success. 2463 */ 2464 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2465 void __user *buffer, size_t *lenp, loff_t *ppos) 2466 { 2467 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2468 do_proc_dointvec_ms_jiffies_conv, NULL); 2469 } 2470 2471 static int proc_do_cad_pid(struct ctl_table *table, int write, 2472 void __user *buffer, size_t *lenp, loff_t *ppos) 2473 { 2474 struct pid *new_pid; 2475 pid_t tmp; 2476 int r; 2477 2478 tmp = pid_vnr(cad_pid); 2479 2480 r = __do_proc_dointvec(&tmp, table, write, buffer, 2481 lenp, ppos, NULL, NULL); 2482 if (r || !write) 2483 return r; 2484 2485 new_pid = find_get_pid(tmp); 2486 if (!new_pid) 2487 return -ESRCH; 2488 2489 put_pid(xchg(&cad_pid, new_pid)); 2490 return 0; 2491 } 2492 2493 /** 2494 * proc_do_large_bitmap - read/write from/to a large bitmap 2495 * @table: the sysctl table 2496 * @write: %TRUE if this is a write to the sysctl file 2497 * @buffer: the user buffer 2498 * @lenp: the size of the user buffer 2499 * @ppos: file position 2500 * 2501 * The bitmap is stored at table->data and the bitmap length (in bits) 2502 * in table->maxlen. 2503 * 2504 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2505 * large bitmaps may be represented in a compact manner. Writing into 2506 * the file will clear the bitmap then update it with the given input. 2507 * 2508 * Returns 0 on success. 2509 */ 2510 int proc_do_large_bitmap(struct ctl_table *table, int write, 2511 void __user *buffer, size_t *lenp, loff_t *ppos) 2512 { 2513 int err = 0; 2514 bool first = 1; 2515 size_t left = *lenp; 2516 unsigned long bitmap_len = table->maxlen; 2517 unsigned long *bitmap = (unsigned long *) table->data; 2518 unsigned long *tmp_bitmap = NULL; 2519 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2520 2521 if (!bitmap_len || !left || (*ppos && !write)) { 2522 *lenp = 0; 2523 return 0; 2524 } 2525 2526 if (write) { 2527 unsigned long page = 0; 2528 char *kbuf; 2529 2530 if (left > PAGE_SIZE - 1) 2531 left = PAGE_SIZE - 1; 2532 2533 page = __get_free_page(GFP_TEMPORARY); 2534 kbuf = (char *) page; 2535 if (!kbuf) 2536 return -ENOMEM; 2537 if (copy_from_user(kbuf, buffer, left)) { 2538 free_page(page); 2539 return -EFAULT; 2540 } 2541 kbuf[left] = 0; 2542 2543 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2544 GFP_KERNEL); 2545 if (!tmp_bitmap) { 2546 free_page(page); 2547 return -ENOMEM; 2548 } 2549 proc_skip_char(&kbuf, &left, '\n'); 2550 while (!err && left) { 2551 unsigned long val_a, val_b; 2552 bool neg; 2553 2554 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2555 sizeof(tr_a), &c); 2556 if (err) 2557 break; 2558 if (val_a >= bitmap_len || neg) { 2559 err = -EINVAL; 2560 break; 2561 } 2562 2563 val_b = val_a; 2564 if (left) { 2565 kbuf++; 2566 left--; 2567 } 2568 2569 if (c == '-') { 2570 err = proc_get_long(&kbuf, &left, &val_b, 2571 &neg, tr_b, sizeof(tr_b), 2572 &c); 2573 if (err) 2574 break; 2575 if (val_b >= bitmap_len || neg || 2576 val_a > val_b) { 2577 err = -EINVAL; 2578 break; 2579 } 2580 if (left) { 2581 kbuf++; 2582 left--; 2583 } 2584 } 2585 2586 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2587 first = 0; 2588 proc_skip_char(&kbuf, &left, '\n'); 2589 } 2590 free_page(page); 2591 } else { 2592 unsigned long bit_a, bit_b = 0; 2593 2594 while (left) { 2595 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2596 if (bit_a >= bitmap_len) 2597 break; 2598 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2599 bit_a + 1) - 1; 2600 2601 if (!first) { 2602 err = proc_put_char(&buffer, &left, ','); 2603 if (err) 2604 break; 2605 } 2606 err = proc_put_long(&buffer, &left, bit_a, false); 2607 if (err) 2608 break; 2609 if (bit_a != bit_b) { 2610 err = proc_put_char(&buffer, &left, '-'); 2611 if (err) 2612 break; 2613 err = proc_put_long(&buffer, &left, bit_b, false); 2614 if (err) 2615 break; 2616 } 2617 2618 first = 0; bit_b++; 2619 } 2620 if (!err) 2621 err = proc_put_char(&buffer, &left, '\n'); 2622 } 2623 2624 if (!err) { 2625 if (write) { 2626 if (*ppos) 2627 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2628 else 2629 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2630 } 2631 kfree(tmp_bitmap); 2632 *lenp -= left; 2633 *ppos += *lenp; 2634 return 0; 2635 } else { 2636 kfree(tmp_bitmap); 2637 return err; 2638 } 2639 } 2640 2641 #else /* CONFIG_PROC_SYSCTL */ 2642 2643 int proc_dostring(struct ctl_table *table, int write, 2644 void __user *buffer, size_t *lenp, loff_t *ppos) 2645 { 2646 return -ENOSYS; 2647 } 2648 2649 int proc_dointvec(struct ctl_table *table, int write, 2650 void __user *buffer, size_t *lenp, loff_t *ppos) 2651 { 2652 return -ENOSYS; 2653 } 2654 2655 int proc_dointvec_minmax(struct ctl_table *table, int write, 2656 void __user *buffer, size_t *lenp, loff_t *ppos) 2657 { 2658 return -ENOSYS; 2659 } 2660 2661 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2662 void __user *buffer, size_t *lenp, loff_t *ppos) 2663 { 2664 return -ENOSYS; 2665 } 2666 2667 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2668 void __user *buffer, size_t *lenp, loff_t *ppos) 2669 { 2670 return -ENOSYS; 2671 } 2672 2673 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2674 void __user *buffer, size_t *lenp, loff_t *ppos) 2675 { 2676 return -ENOSYS; 2677 } 2678 2679 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2680 void __user *buffer, size_t *lenp, loff_t *ppos) 2681 { 2682 return -ENOSYS; 2683 } 2684 2685 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2686 void __user *buffer, 2687 size_t *lenp, loff_t *ppos) 2688 { 2689 return -ENOSYS; 2690 } 2691 2692 2693 #endif /* CONFIG_PROC_SYSCTL */ 2694 2695 /* 2696 * No sense putting this after each symbol definition, twice, 2697 * exception granted :-) 2698 */ 2699 EXPORT_SYMBOL(proc_dointvec); 2700 EXPORT_SYMBOL(proc_dointvec_jiffies); 2701 EXPORT_SYMBOL(proc_dointvec_minmax); 2702 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2703 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2704 EXPORT_SYMBOL(proc_dostring); 2705 EXPORT_SYMBOL(proc_doulongvec_minmax); 2706 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2707