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 66 #include <asm/uaccess.h> 67 #include <asm/processor.h> 68 69 #ifdef CONFIG_X86 70 #include <asm/nmi.h> 71 #include <asm/stacktrace.h> 72 #include <asm/io.h> 73 #endif 74 #ifdef CONFIG_SPARC 75 #include <asm/setup.h> 76 #endif 77 #ifdef CONFIG_BSD_PROCESS_ACCT 78 #include <linux/acct.h> 79 #endif 80 #ifdef CONFIG_RT_MUTEXES 81 #include <linux/rtmutex.h> 82 #endif 83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 84 #include <linux/lockdep.h> 85 #endif 86 #ifdef CONFIG_CHR_DEV_SG 87 #include <scsi/sg.h> 88 #endif 89 90 #ifdef CONFIG_LOCKUP_DETECTOR 91 #include <linux/nmi.h> 92 #endif 93 94 95 #if defined(CONFIG_SYSCTL) 96 97 /* External variables not in a header file. */ 98 extern int sysctl_overcommit_memory; 99 extern int sysctl_overcommit_ratio; 100 extern int max_threads; 101 extern int suid_dumpable; 102 #ifdef CONFIG_COREDUMP 103 extern int core_uses_pid; 104 extern char core_pattern[]; 105 extern unsigned int core_pipe_limit; 106 #endif 107 extern int pid_max; 108 extern int pid_max_min, pid_max_max; 109 extern int percpu_pagelist_fraction; 110 extern int compat_log; 111 extern int latencytop_enabled; 112 extern int sysctl_nr_open_min, sysctl_nr_open_max; 113 #ifndef CONFIG_MMU 114 extern int sysctl_nr_trim_pages; 115 #endif 116 #ifdef CONFIG_BLOCK 117 extern int blk_iopoll_enabled; 118 #endif 119 120 /* Constants used for minimum and maximum */ 121 #ifdef CONFIG_LOCKUP_DETECTOR 122 static int sixty = 60; 123 #endif 124 125 static int zero; 126 static int __maybe_unused one = 1; 127 static int __maybe_unused two = 2; 128 static int __maybe_unused three = 3; 129 static unsigned long one_ul = 1; 130 static int one_hundred = 100; 131 #ifdef CONFIG_PRINTK 132 static int ten_thousand = 10000; 133 #endif 134 135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 137 138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 139 static int maxolduid = 65535; 140 static int minolduid; 141 static int min_percpu_pagelist_fract = 8; 142 143 static int ngroups_max = NGROUPS_MAX; 144 static const int cap_last_cap = CAP_LAST_CAP; 145 146 #ifdef CONFIG_INOTIFY_USER 147 #include <linux/inotify.h> 148 #endif 149 #ifdef CONFIG_SPARC 150 #endif 151 152 #ifdef CONFIG_SPARC64 153 extern int sysctl_tsb_ratio; 154 #endif 155 156 #ifdef __hppa__ 157 extern int pwrsw_enabled; 158 #endif 159 160 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 161 extern int unaligned_enabled; 162 #endif 163 164 #ifdef CONFIG_IA64 165 extern int unaligned_dump_stack; 166 #endif 167 168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 169 extern int no_unaligned_warning; 170 #endif 171 172 #ifdef CONFIG_PROC_SYSCTL 173 static int proc_do_cad_pid(struct ctl_table *table, int write, 174 void __user *buffer, size_t *lenp, loff_t *ppos); 175 static int proc_taint(struct ctl_table *table, int write, 176 void __user *buffer, size_t *lenp, loff_t *ppos); 177 #endif 178 179 #ifdef CONFIG_PRINTK 180 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 181 void __user *buffer, size_t *lenp, loff_t *ppos); 182 #endif 183 184 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 185 void __user *buffer, size_t *lenp, loff_t *ppos); 186 #ifdef CONFIG_COREDUMP 187 static int proc_dostring_coredump(struct ctl_table *table, int write, 188 void __user *buffer, size_t *lenp, loff_t *ppos); 189 #endif 190 191 #ifdef CONFIG_MAGIC_SYSRQ 192 /* Note: sysrq code uses it's own private copy */ 193 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 194 195 static int sysrq_sysctl_handler(ctl_table *table, int write, 196 void __user *buffer, size_t *lenp, 197 loff_t *ppos) 198 { 199 int error; 200 201 error = proc_dointvec(table, write, buffer, lenp, ppos); 202 if (error) 203 return error; 204 205 if (write) 206 sysrq_toggle_support(__sysrq_enabled); 207 208 return 0; 209 } 210 211 #endif 212 213 static struct ctl_table kern_table[]; 214 static struct ctl_table vm_table[]; 215 static struct ctl_table fs_table[]; 216 static struct ctl_table debug_table[]; 217 static struct ctl_table dev_table[]; 218 extern struct ctl_table random_table[]; 219 #ifdef CONFIG_EPOLL 220 extern struct ctl_table epoll_table[]; 221 #endif 222 223 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 224 int sysctl_legacy_va_layout; 225 #endif 226 227 /* The default sysctl tables: */ 228 229 static struct ctl_table sysctl_base_table[] = { 230 { 231 .procname = "kernel", 232 .mode = 0555, 233 .child = kern_table, 234 }, 235 { 236 .procname = "vm", 237 .mode = 0555, 238 .child = vm_table, 239 }, 240 { 241 .procname = "fs", 242 .mode = 0555, 243 .child = fs_table, 244 }, 245 { 246 .procname = "debug", 247 .mode = 0555, 248 .child = debug_table, 249 }, 250 { 251 .procname = "dev", 252 .mode = 0555, 253 .child = dev_table, 254 }, 255 { } 256 }; 257 258 #ifdef CONFIG_SCHED_DEBUG 259 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 260 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 261 static int min_wakeup_granularity_ns; /* 0 usecs */ 262 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 263 #ifdef CONFIG_SMP 264 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 265 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 266 #endif /* CONFIG_SMP */ 267 #endif /* CONFIG_SCHED_DEBUG */ 268 269 #ifdef CONFIG_COMPACTION 270 static int min_extfrag_threshold; 271 static int max_extfrag_threshold = 1000; 272 #endif 273 274 static struct ctl_table kern_table[] = { 275 { 276 .procname = "sched_child_runs_first", 277 .data = &sysctl_sched_child_runs_first, 278 .maxlen = sizeof(unsigned int), 279 .mode = 0644, 280 .proc_handler = proc_dointvec, 281 }, 282 #ifdef CONFIG_SCHED_DEBUG 283 { 284 .procname = "sched_min_granularity_ns", 285 .data = &sysctl_sched_min_granularity, 286 .maxlen = sizeof(unsigned int), 287 .mode = 0644, 288 .proc_handler = sched_proc_update_handler, 289 .extra1 = &min_sched_granularity_ns, 290 .extra2 = &max_sched_granularity_ns, 291 }, 292 { 293 .procname = "sched_latency_ns", 294 .data = &sysctl_sched_latency, 295 .maxlen = sizeof(unsigned int), 296 .mode = 0644, 297 .proc_handler = sched_proc_update_handler, 298 .extra1 = &min_sched_granularity_ns, 299 .extra2 = &max_sched_granularity_ns, 300 }, 301 { 302 .procname = "sched_wakeup_granularity_ns", 303 .data = &sysctl_sched_wakeup_granularity, 304 .maxlen = sizeof(unsigned int), 305 .mode = 0644, 306 .proc_handler = sched_proc_update_handler, 307 .extra1 = &min_wakeup_granularity_ns, 308 .extra2 = &max_wakeup_granularity_ns, 309 }, 310 #ifdef CONFIG_SMP 311 { 312 .procname = "sched_tunable_scaling", 313 .data = &sysctl_sched_tunable_scaling, 314 .maxlen = sizeof(enum sched_tunable_scaling), 315 .mode = 0644, 316 .proc_handler = sched_proc_update_handler, 317 .extra1 = &min_sched_tunable_scaling, 318 .extra2 = &max_sched_tunable_scaling, 319 }, 320 { 321 .procname = "sched_migration_cost_ns", 322 .data = &sysctl_sched_migration_cost, 323 .maxlen = sizeof(unsigned int), 324 .mode = 0644, 325 .proc_handler = proc_dointvec, 326 }, 327 { 328 .procname = "sched_nr_migrate", 329 .data = &sysctl_sched_nr_migrate, 330 .maxlen = sizeof(unsigned int), 331 .mode = 0644, 332 .proc_handler = proc_dointvec, 333 }, 334 { 335 .procname = "sched_time_avg_ms", 336 .data = &sysctl_sched_time_avg, 337 .maxlen = sizeof(unsigned int), 338 .mode = 0644, 339 .proc_handler = proc_dointvec, 340 }, 341 { 342 .procname = "sched_shares_window_ns", 343 .data = &sysctl_sched_shares_window, 344 .maxlen = sizeof(unsigned int), 345 .mode = 0644, 346 .proc_handler = proc_dointvec, 347 }, 348 { 349 .procname = "timer_migration", 350 .data = &sysctl_timer_migration, 351 .maxlen = sizeof(unsigned int), 352 .mode = 0644, 353 .proc_handler = proc_dointvec_minmax, 354 .extra1 = &zero, 355 .extra2 = &one, 356 }, 357 #endif /* CONFIG_SMP */ 358 #ifdef CONFIG_NUMA_BALANCING 359 { 360 .procname = "numa_balancing_scan_delay_ms", 361 .data = &sysctl_numa_balancing_scan_delay, 362 .maxlen = sizeof(unsigned int), 363 .mode = 0644, 364 .proc_handler = proc_dointvec, 365 }, 366 { 367 .procname = "numa_balancing_scan_period_min_ms", 368 .data = &sysctl_numa_balancing_scan_period_min, 369 .maxlen = sizeof(unsigned int), 370 .mode = 0644, 371 .proc_handler = proc_dointvec, 372 }, 373 { 374 .procname = "numa_balancing_scan_period_max_ms", 375 .data = &sysctl_numa_balancing_scan_period_max, 376 .maxlen = sizeof(unsigned int), 377 .mode = 0644, 378 .proc_handler = proc_dointvec, 379 }, 380 { 381 .procname = "numa_balancing_scan_size_mb", 382 .data = &sysctl_numa_balancing_scan_size, 383 .maxlen = sizeof(unsigned int), 384 .mode = 0644, 385 .proc_handler = proc_dointvec, 386 }, 387 { 388 .procname = "numa_balancing_migrate_deferred", 389 .data = &sysctl_numa_balancing_migrate_deferred, 390 .maxlen = sizeof(unsigned int), 391 .mode = 0644, 392 .proc_handler = proc_dointvec, 393 }, 394 #endif /* CONFIG_NUMA_BALANCING */ 395 #endif /* CONFIG_SCHED_DEBUG */ 396 { 397 .procname = "sched_rt_period_us", 398 .data = &sysctl_sched_rt_period, 399 .maxlen = sizeof(unsigned int), 400 .mode = 0644, 401 .proc_handler = sched_rt_handler, 402 }, 403 { 404 .procname = "sched_rt_runtime_us", 405 .data = &sysctl_sched_rt_runtime, 406 .maxlen = sizeof(int), 407 .mode = 0644, 408 .proc_handler = sched_rt_handler, 409 }, 410 { 411 .procname = "sched_rr_timeslice_ms", 412 .data = &sched_rr_timeslice, 413 .maxlen = sizeof(int), 414 .mode = 0644, 415 .proc_handler = sched_rr_handler, 416 }, 417 #ifdef CONFIG_SCHED_AUTOGROUP 418 { 419 .procname = "sched_autogroup_enabled", 420 .data = &sysctl_sched_autogroup_enabled, 421 .maxlen = sizeof(unsigned int), 422 .mode = 0644, 423 .proc_handler = proc_dointvec_minmax, 424 .extra1 = &zero, 425 .extra2 = &one, 426 }, 427 #endif 428 #ifdef CONFIG_CFS_BANDWIDTH 429 { 430 .procname = "sched_cfs_bandwidth_slice_us", 431 .data = &sysctl_sched_cfs_bandwidth_slice, 432 .maxlen = sizeof(unsigned int), 433 .mode = 0644, 434 .proc_handler = proc_dointvec_minmax, 435 .extra1 = &one, 436 }, 437 #endif 438 #ifdef CONFIG_PROVE_LOCKING 439 { 440 .procname = "prove_locking", 441 .data = &prove_locking, 442 .maxlen = sizeof(int), 443 .mode = 0644, 444 .proc_handler = proc_dointvec, 445 }, 446 #endif 447 #ifdef CONFIG_LOCK_STAT 448 { 449 .procname = "lock_stat", 450 .data = &lock_stat, 451 .maxlen = sizeof(int), 452 .mode = 0644, 453 .proc_handler = proc_dointvec, 454 }, 455 #endif 456 { 457 .procname = "panic", 458 .data = &panic_timeout, 459 .maxlen = sizeof(int), 460 .mode = 0644, 461 .proc_handler = proc_dointvec, 462 }, 463 #ifdef CONFIG_COREDUMP 464 { 465 .procname = "core_uses_pid", 466 .data = &core_uses_pid, 467 .maxlen = sizeof(int), 468 .mode = 0644, 469 .proc_handler = proc_dointvec, 470 }, 471 { 472 .procname = "core_pattern", 473 .data = core_pattern, 474 .maxlen = CORENAME_MAX_SIZE, 475 .mode = 0644, 476 .proc_handler = proc_dostring_coredump, 477 }, 478 { 479 .procname = "core_pipe_limit", 480 .data = &core_pipe_limit, 481 .maxlen = sizeof(unsigned int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec, 484 }, 485 #endif 486 #ifdef CONFIG_PROC_SYSCTL 487 { 488 .procname = "tainted", 489 .maxlen = sizeof(long), 490 .mode = 0644, 491 .proc_handler = proc_taint, 492 }, 493 #endif 494 #ifdef CONFIG_LATENCYTOP 495 { 496 .procname = "latencytop", 497 .data = &latencytop_enabled, 498 .maxlen = sizeof(int), 499 .mode = 0644, 500 .proc_handler = proc_dointvec, 501 }, 502 #endif 503 #ifdef CONFIG_BLK_DEV_INITRD 504 { 505 .procname = "real-root-dev", 506 .data = &real_root_dev, 507 .maxlen = sizeof(int), 508 .mode = 0644, 509 .proc_handler = proc_dointvec, 510 }, 511 #endif 512 { 513 .procname = "print-fatal-signals", 514 .data = &print_fatal_signals, 515 .maxlen = sizeof(int), 516 .mode = 0644, 517 .proc_handler = proc_dointvec, 518 }, 519 #ifdef CONFIG_SPARC 520 { 521 .procname = "reboot-cmd", 522 .data = reboot_command, 523 .maxlen = 256, 524 .mode = 0644, 525 .proc_handler = proc_dostring, 526 }, 527 { 528 .procname = "stop-a", 529 .data = &stop_a_enabled, 530 .maxlen = sizeof (int), 531 .mode = 0644, 532 .proc_handler = proc_dointvec, 533 }, 534 { 535 .procname = "scons-poweroff", 536 .data = &scons_pwroff, 537 .maxlen = sizeof (int), 538 .mode = 0644, 539 .proc_handler = proc_dointvec, 540 }, 541 #endif 542 #ifdef CONFIG_SPARC64 543 { 544 .procname = "tsb-ratio", 545 .data = &sysctl_tsb_ratio, 546 .maxlen = sizeof (int), 547 .mode = 0644, 548 .proc_handler = proc_dointvec, 549 }, 550 #endif 551 #ifdef __hppa__ 552 { 553 .procname = "soft-power", 554 .data = &pwrsw_enabled, 555 .maxlen = sizeof (int), 556 .mode = 0644, 557 .proc_handler = proc_dointvec, 558 }, 559 #endif 560 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 561 { 562 .procname = "unaligned-trap", 563 .data = &unaligned_enabled, 564 .maxlen = sizeof (int), 565 .mode = 0644, 566 .proc_handler = proc_dointvec, 567 }, 568 #endif 569 { 570 .procname = "ctrl-alt-del", 571 .data = &C_A_D, 572 .maxlen = sizeof(int), 573 .mode = 0644, 574 .proc_handler = proc_dointvec, 575 }, 576 #ifdef CONFIG_FUNCTION_TRACER 577 { 578 .procname = "ftrace_enabled", 579 .data = &ftrace_enabled, 580 .maxlen = sizeof(int), 581 .mode = 0644, 582 .proc_handler = ftrace_enable_sysctl, 583 }, 584 #endif 585 #ifdef CONFIG_STACK_TRACER 586 { 587 .procname = "stack_tracer_enabled", 588 .data = &stack_tracer_enabled, 589 .maxlen = sizeof(int), 590 .mode = 0644, 591 .proc_handler = stack_trace_sysctl, 592 }, 593 #endif 594 #ifdef CONFIG_TRACING 595 { 596 .procname = "ftrace_dump_on_oops", 597 .data = &ftrace_dump_on_oops, 598 .maxlen = sizeof(int), 599 .mode = 0644, 600 .proc_handler = proc_dointvec, 601 }, 602 { 603 .procname = "traceoff_on_warning", 604 .data = &__disable_trace_on_warning, 605 .maxlen = sizeof(__disable_trace_on_warning), 606 .mode = 0644, 607 .proc_handler = proc_dointvec, 608 }, 609 #endif 610 #ifdef CONFIG_MODULES 611 { 612 .procname = "modprobe", 613 .data = &modprobe_path, 614 .maxlen = KMOD_PATH_LEN, 615 .mode = 0644, 616 .proc_handler = proc_dostring, 617 }, 618 { 619 .procname = "modules_disabled", 620 .data = &modules_disabled, 621 .maxlen = sizeof(int), 622 .mode = 0644, 623 /* only handle a transition from default "0" to "1" */ 624 .proc_handler = proc_dointvec_minmax, 625 .extra1 = &one, 626 .extra2 = &one, 627 }, 628 #endif 629 630 { 631 .procname = "hotplug", 632 .data = &uevent_helper, 633 .maxlen = UEVENT_HELPER_PATH_LEN, 634 .mode = 0644, 635 .proc_handler = proc_dostring, 636 }, 637 638 #ifdef CONFIG_CHR_DEV_SG 639 { 640 .procname = "sg-big-buff", 641 .data = &sg_big_buff, 642 .maxlen = sizeof (int), 643 .mode = 0444, 644 .proc_handler = proc_dointvec, 645 }, 646 #endif 647 #ifdef CONFIG_BSD_PROCESS_ACCT 648 { 649 .procname = "acct", 650 .data = &acct_parm, 651 .maxlen = 3*sizeof(int), 652 .mode = 0644, 653 .proc_handler = proc_dointvec, 654 }, 655 #endif 656 #ifdef CONFIG_MAGIC_SYSRQ 657 { 658 .procname = "sysrq", 659 .data = &__sysrq_enabled, 660 .maxlen = sizeof (int), 661 .mode = 0644, 662 .proc_handler = sysrq_sysctl_handler, 663 }, 664 #endif 665 #ifdef CONFIG_PROC_SYSCTL 666 { 667 .procname = "cad_pid", 668 .data = NULL, 669 .maxlen = sizeof (int), 670 .mode = 0600, 671 .proc_handler = proc_do_cad_pid, 672 }, 673 #endif 674 { 675 .procname = "threads-max", 676 .data = &max_threads, 677 .maxlen = sizeof(int), 678 .mode = 0644, 679 .proc_handler = proc_dointvec, 680 }, 681 { 682 .procname = "random", 683 .mode = 0555, 684 .child = random_table, 685 }, 686 { 687 .procname = "usermodehelper", 688 .mode = 0555, 689 .child = usermodehelper_table, 690 }, 691 { 692 .procname = "overflowuid", 693 .data = &overflowuid, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_dointvec_minmax, 697 .extra1 = &minolduid, 698 .extra2 = &maxolduid, 699 }, 700 { 701 .procname = "overflowgid", 702 .data = &overflowgid, 703 .maxlen = sizeof(int), 704 .mode = 0644, 705 .proc_handler = proc_dointvec_minmax, 706 .extra1 = &minolduid, 707 .extra2 = &maxolduid, 708 }, 709 #ifdef CONFIG_S390 710 #ifdef CONFIG_MATHEMU 711 { 712 .procname = "ieee_emulation_warnings", 713 .data = &sysctl_ieee_emulation_warnings, 714 .maxlen = sizeof(int), 715 .mode = 0644, 716 .proc_handler = proc_dointvec, 717 }, 718 #endif 719 { 720 .procname = "userprocess_debug", 721 .data = &show_unhandled_signals, 722 .maxlen = sizeof(int), 723 .mode = 0644, 724 .proc_handler = proc_dointvec, 725 }, 726 #endif 727 { 728 .procname = "pid_max", 729 .data = &pid_max, 730 .maxlen = sizeof (int), 731 .mode = 0644, 732 .proc_handler = proc_dointvec_minmax, 733 .extra1 = &pid_max_min, 734 .extra2 = &pid_max_max, 735 }, 736 { 737 .procname = "panic_on_oops", 738 .data = &panic_on_oops, 739 .maxlen = sizeof(int), 740 .mode = 0644, 741 .proc_handler = proc_dointvec, 742 }, 743 #if defined CONFIG_PRINTK 744 { 745 .procname = "printk", 746 .data = &console_loglevel, 747 .maxlen = 4*sizeof(int), 748 .mode = 0644, 749 .proc_handler = proc_dointvec, 750 }, 751 { 752 .procname = "printk_ratelimit", 753 .data = &printk_ratelimit_state.interval, 754 .maxlen = sizeof(int), 755 .mode = 0644, 756 .proc_handler = proc_dointvec_jiffies, 757 }, 758 { 759 .procname = "printk_ratelimit_burst", 760 .data = &printk_ratelimit_state.burst, 761 .maxlen = sizeof(int), 762 .mode = 0644, 763 .proc_handler = proc_dointvec, 764 }, 765 { 766 .procname = "printk_delay", 767 .data = &printk_delay_msec, 768 .maxlen = sizeof(int), 769 .mode = 0644, 770 .proc_handler = proc_dointvec_minmax, 771 .extra1 = &zero, 772 .extra2 = &ten_thousand, 773 }, 774 { 775 .procname = "dmesg_restrict", 776 .data = &dmesg_restrict, 777 .maxlen = sizeof(int), 778 .mode = 0644, 779 .proc_handler = proc_dointvec_minmax_sysadmin, 780 .extra1 = &zero, 781 .extra2 = &one, 782 }, 783 { 784 .procname = "kptr_restrict", 785 .data = &kptr_restrict, 786 .maxlen = sizeof(int), 787 .mode = 0644, 788 .proc_handler = proc_dointvec_minmax_sysadmin, 789 .extra1 = &zero, 790 .extra2 = &two, 791 }, 792 #endif 793 { 794 .procname = "ngroups_max", 795 .data = &ngroups_max, 796 .maxlen = sizeof (int), 797 .mode = 0444, 798 .proc_handler = proc_dointvec, 799 }, 800 { 801 .procname = "cap_last_cap", 802 .data = (void *)&cap_last_cap, 803 .maxlen = sizeof(int), 804 .mode = 0444, 805 .proc_handler = proc_dointvec, 806 }, 807 #if defined(CONFIG_LOCKUP_DETECTOR) 808 { 809 .procname = "watchdog", 810 .data = &watchdog_user_enabled, 811 .maxlen = sizeof (int), 812 .mode = 0644, 813 .proc_handler = proc_dowatchdog, 814 .extra1 = &zero, 815 .extra2 = &one, 816 }, 817 { 818 .procname = "watchdog_thresh", 819 .data = &watchdog_thresh, 820 .maxlen = sizeof(int), 821 .mode = 0644, 822 .proc_handler = proc_dowatchdog, 823 .extra1 = &zero, 824 .extra2 = &sixty, 825 }, 826 { 827 .procname = "softlockup_panic", 828 .data = &softlockup_panic, 829 .maxlen = sizeof(int), 830 .mode = 0644, 831 .proc_handler = proc_dointvec_minmax, 832 .extra1 = &zero, 833 .extra2 = &one, 834 }, 835 { 836 .procname = "nmi_watchdog", 837 .data = &watchdog_user_enabled, 838 .maxlen = sizeof (int), 839 .mode = 0644, 840 .proc_handler = proc_dowatchdog, 841 .extra1 = &zero, 842 .extra2 = &one, 843 }, 844 #endif 845 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 846 { 847 .procname = "unknown_nmi_panic", 848 .data = &unknown_nmi_panic, 849 .maxlen = sizeof (int), 850 .mode = 0644, 851 .proc_handler = proc_dointvec, 852 }, 853 #endif 854 #if defined(CONFIG_X86) 855 { 856 .procname = "panic_on_unrecovered_nmi", 857 .data = &panic_on_unrecovered_nmi, 858 .maxlen = sizeof(int), 859 .mode = 0644, 860 .proc_handler = proc_dointvec, 861 }, 862 { 863 .procname = "panic_on_io_nmi", 864 .data = &panic_on_io_nmi, 865 .maxlen = sizeof(int), 866 .mode = 0644, 867 .proc_handler = proc_dointvec, 868 }, 869 #ifdef CONFIG_DEBUG_STACKOVERFLOW 870 { 871 .procname = "panic_on_stackoverflow", 872 .data = &sysctl_panic_on_stackoverflow, 873 .maxlen = sizeof(int), 874 .mode = 0644, 875 .proc_handler = proc_dointvec, 876 }, 877 #endif 878 { 879 .procname = "bootloader_type", 880 .data = &bootloader_type, 881 .maxlen = sizeof (int), 882 .mode = 0444, 883 .proc_handler = proc_dointvec, 884 }, 885 { 886 .procname = "bootloader_version", 887 .data = &bootloader_version, 888 .maxlen = sizeof (int), 889 .mode = 0444, 890 .proc_handler = proc_dointvec, 891 }, 892 { 893 .procname = "kstack_depth_to_print", 894 .data = &kstack_depth_to_print, 895 .maxlen = sizeof(int), 896 .mode = 0644, 897 .proc_handler = proc_dointvec, 898 }, 899 { 900 .procname = "io_delay_type", 901 .data = &io_delay_type, 902 .maxlen = sizeof(int), 903 .mode = 0644, 904 .proc_handler = proc_dointvec, 905 }, 906 #endif 907 #if defined(CONFIG_MMU) 908 { 909 .procname = "randomize_va_space", 910 .data = &randomize_va_space, 911 .maxlen = sizeof(int), 912 .mode = 0644, 913 .proc_handler = proc_dointvec, 914 }, 915 #endif 916 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 917 { 918 .procname = "spin_retry", 919 .data = &spin_retry, 920 .maxlen = sizeof (int), 921 .mode = 0644, 922 .proc_handler = proc_dointvec, 923 }, 924 #endif 925 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 926 { 927 .procname = "acpi_video_flags", 928 .data = &acpi_realmode_flags, 929 .maxlen = sizeof (unsigned long), 930 .mode = 0644, 931 .proc_handler = proc_doulongvec_minmax, 932 }, 933 #endif 934 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 935 { 936 .procname = "ignore-unaligned-usertrap", 937 .data = &no_unaligned_warning, 938 .maxlen = sizeof (int), 939 .mode = 0644, 940 .proc_handler = proc_dointvec, 941 }, 942 #endif 943 #ifdef CONFIG_IA64 944 { 945 .procname = "unaligned-dump-stack", 946 .data = &unaligned_dump_stack, 947 .maxlen = sizeof (int), 948 .mode = 0644, 949 .proc_handler = proc_dointvec, 950 }, 951 #endif 952 #ifdef CONFIG_DETECT_HUNG_TASK 953 { 954 .procname = "hung_task_panic", 955 .data = &sysctl_hung_task_panic, 956 .maxlen = sizeof(int), 957 .mode = 0644, 958 .proc_handler = proc_dointvec_minmax, 959 .extra1 = &zero, 960 .extra2 = &one, 961 }, 962 { 963 .procname = "hung_task_check_count", 964 .data = &sysctl_hung_task_check_count, 965 .maxlen = sizeof(int), 966 .mode = 0644, 967 .proc_handler = proc_dointvec_minmax, 968 .extra1 = &zero, 969 }, 970 { 971 .procname = "hung_task_timeout_secs", 972 .data = &sysctl_hung_task_timeout_secs, 973 .maxlen = sizeof(unsigned long), 974 .mode = 0644, 975 .proc_handler = proc_dohung_task_timeout_secs, 976 }, 977 { 978 .procname = "hung_task_warnings", 979 .data = &sysctl_hung_task_warnings, 980 .maxlen = sizeof(unsigned long), 981 .mode = 0644, 982 .proc_handler = proc_doulongvec_minmax, 983 }, 984 #endif 985 #ifdef CONFIG_COMPAT 986 { 987 .procname = "compat-log", 988 .data = &compat_log, 989 .maxlen = sizeof (int), 990 .mode = 0644, 991 .proc_handler = proc_dointvec, 992 }, 993 #endif 994 #ifdef CONFIG_RT_MUTEXES 995 { 996 .procname = "max_lock_depth", 997 .data = &max_lock_depth, 998 .maxlen = sizeof(int), 999 .mode = 0644, 1000 .proc_handler = proc_dointvec, 1001 }, 1002 #endif 1003 { 1004 .procname = "poweroff_cmd", 1005 .data = &poweroff_cmd, 1006 .maxlen = POWEROFF_CMD_PATH_LEN, 1007 .mode = 0644, 1008 .proc_handler = proc_dostring, 1009 }, 1010 #ifdef CONFIG_KEYS 1011 { 1012 .procname = "keys", 1013 .mode = 0555, 1014 .child = key_sysctls, 1015 }, 1016 #endif 1017 #ifdef CONFIG_RCU_TORTURE_TEST 1018 { 1019 .procname = "rcutorture_runnable", 1020 .data = &rcutorture_runnable, 1021 .maxlen = sizeof(int), 1022 .mode = 0644, 1023 .proc_handler = proc_dointvec, 1024 }, 1025 #endif 1026 #ifdef CONFIG_PERF_EVENTS 1027 /* 1028 * User-space scripts rely on the existence of this file 1029 * as a feature check for perf_events being enabled. 1030 * 1031 * So it's an ABI, do not remove! 1032 */ 1033 { 1034 .procname = "perf_event_paranoid", 1035 .data = &sysctl_perf_event_paranoid, 1036 .maxlen = sizeof(sysctl_perf_event_paranoid), 1037 .mode = 0644, 1038 .proc_handler = proc_dointvec, 1039 }, 1040 { 1041 .procname = "perf_event_mlock_kb", 1042 .data = &sysctl_perf_event_mlock, 1043 .maxlen = sizeof(sysctl_perf_event_mlock), 1044 .mode = 0644, 1045 .proc_handler = proc_dointvec, 1046 }, 1047 { 1048 .procname = "perf_event_max_sample_rate", 1049 .data = &sysctl_perf_event_sample_rate, 1050 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1051 .mode = 0644, 1052 .proc_handler = perf_proc_update_handler, 1053 .extra1 = &one, 1054 }, 1055 { 1056 .procname = "perf_cpu_time_max_percent", 1057 .data = &sysctl_perf_cpu_time_max_percent, 1058 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1059 .mode = 0644, 1060 .proc_handler = perf_cpu_time_max_percent_handler, 1061 .extra1 = &zero, 1062 .extra2 = &one_hundred, 1063 }, 1064 #endif 1065 #ifdef CONFIG_KMEMCHECK 1066 { 1067 .procname = "kmemcheck", 1068 .data = &kmemcheck_enabled, 1069 .maxlen = sizeof(int), 1070 .mode = 0644, 1071 .proc_handler = proc_dointvec, 1072 }, 1073 #endif 1074 #ifdef CONFIG_BLOCK 1075 { 1076 .procname = "blk_iopoll", 1077 .data = &blk_iopoll_enabled, 1078 .maxlen = sizeof(int), 1079 .mode = 0644, 1080 .proc_handler = proc_dointvec, 1081 }, 1082 #endif 1083 { } 1084 }; 1085 1086 static struct ctl_table vm_table[] = { 1087 { 1088 .procname = "overcommit_memory", 1089 .data = &sysctl_overcommit_memory, 1090 .maxlen = sizeof(sysctl_overcommit_memory), 1091 .mode = 0644, 1092 .proc_handler = proc_dointvec_minmax, 1093 .extra1 = &zero, 1094 .extra2 = &two, 1095 }, 1096 { 1097 .procname = "panic_on_oom", 1098 .data = &sysctl_panic_on_oom, 1099 .maxlen = sizeof(sysctl_panic_on_oom), 1100 .mode = 0644, 1101 .proc_handler = proc_dointvec_minmax, 1102 .extra1 = &zero, 1103 .extra2 = &two, 1104 }, 1105 { 1106 .procname = "oom_kill_allocating_task", 1107 .data = &sysctl_oom_kill_allocating_task, 1108 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1109 .mode = 0644, 1110 .proc_handler = proc_dointvec, 1111 }, 1112 { 1113 .procname = "oom_dump_tasks", 1114 .data = &sysctl_oom_dump_tasks, 1115 .maxlen = sizeof(sysctl_oom_dump_tasks), 1116 .mode = 0644, 1117 .proc_handler = proc_dointvec, 1118 }, 1119 { 1120 .procname = "overcommit_ratio", 1121 .data = &sysctl_overcommit_ratio, 1122 .maxlen = sizeof(sysctl_overcommit_ratio), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec, 1125 }, 1126 { 1127 .procname = "page-cluster", 1128 .data = &page_cluster, 1129 .maxlen = sizeof(int), 1130 .mode = 0644, 1131 .proc_handler = proc_dointvec_minmax, 1132 .extra1 = &zero, 1133 }, 1134 { 1135 .procname = "dirty_background_ratio", 1136 .data = &dirty_background_ratio, 1137 .maxlen = sizeof(dirty_background_ratio), 1138 .mode = 0644, 1139 .proc_handler = dirty_background_ratio_handler, 1140 .extra1 = &zero, 1141 .extra2 = &one_hundred, 1142 }, 1143 { 1144 .procname = "dirty_background_bytes", 1145 .data = &dirty_background_bytes, 1146 .maxlen = sizeof(dirty_background_bytes), 1147 .mode = 0644, 1148 .proc_handler = dirty_background_bytes_handler, 1149 .extra1 = &one_ul, 1150 }, 1151 { 1152 .procname = "dirty_ratio", 1153 .data = &vm_dirty_ratio, 1154 .maxlen = sizeof(vm_dirty_ratio), 1155 .mode = 0644, 1156 .proc_handler = dirty_ratio_handler, 1157 .extra1 = &zero, 1158 .extra2 = &one_hundred, 1159 }, 1160 { 1161 .procname = "dirty_bytes", 1162 .data = &vm_dirty_bytes, 1163 .maxlen = sizeof(vm_dirty_bytes), 1164 .mode = 0644, 1165 .proc_handler = dirty_bytes_handler, 1166 .extra1 = &dirty_bytes_min, 1167 }, 1168 { 1169 .procname = "dirty_writeback_centisecs", 1170 .data = &dirty_writeback_interval, 1171 .maxlen = sizeof(dirty_writeback_interval), 1172 .mode = 0644, 1173 .proc_handler = dirty_writeback_centisecs_handler, 1174 }, 1175 { 1176 .procname = "dirty_expire_centisecs", 1177 .data = &dirty_expire_interval, 1178 .maxlen = sizeof(dirty_expire_interval), 1179 .mode = 0644, 1180 .proc_handler = proc_dointvec_minmax, 1181 .extra1 = &zero, 1182 }, 1183 { 1184 .procname = "nr_pdflush_threads", 1185 .mode = 0444 /* read-only */, 1186 .proc_handler = pdflush_proc_obsolete, 1187 }, 1188 { 1189 .procname = "swappiness", 1190 .data = &vm_swappiness, 1191 .maxlen = sizeof(vm_swappiness), 1192 .mode = 0644, 1193 .proc_handler = proc_dointvec_minmax, 1194 .extra1 = &zero, 1195 .extra2 = &one_hundred, 1196 }, 1197 #ifdef CONFIG_HUGETLB_PAGE 1198 { 1199 .procname = "nr_hugepages", 1200 .data = NULL, 1201 .maxlen = sizeof(unsigned long), 1202 .mode = 0644, 1203 .proc_handler = hugetlb_sysctl_handler, 1204 .extra1 = (void *)&hugetlb_zero, 1205 .extra2 = (void *)&hugetlb_infinity, 1206 }, 1207 #ifdef CONFIG_NUMA 1208 { 1209 .procname = "nr_hugepages_mempolicy", 1210 .data = NULL, 1211 .maxlen = sizeof(unsigned long), 1212 .mode = 0644, 1213 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1214 .extra1 = (void *)&hugetlb_zero, 1215 .extra2 = (void *)&hugetlb_infinity, 1216 }, 1217 #endif 1218 { 1219 .procname = "hugetlb_shm_group", 1220 .data = &sysctl_hugetlb_shm_group, 1221 .maxlen = sizeof(gid_t), 1222 .mode = 0644, 1223 .proc_handler = proc_dointvec, 1224 }, 1225 { 1226 .procname = "hugepages_treat_as_movable", 1227 .data = &hugepages_treat_as_movable, 1228 .maxlen = sizeof(int), 1229 .mode = 0644, 1230 .proc_handler = proc_dointvec, 1231 }, 1232 { 1233 .procname = "nr_overcommit_hugepages", 1234 .data = NULL, 1235 .maxlen = sizeof(unsigned long), 1236 .mode = 0644, 1237 .proc_handler = hugetlb_overcommit_handler, 1238 .extra1 = (void *)&hugetlb_zero, 1239 .extra2 = (void *)&hugetlb_infinity, 1240 }, 1241 #endif 1242 { 1243 .procname = "lowmem_reserve_ratio", 1244 .data = &sysctl_lowmem_reserve_ratio, 1245 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1246 .mode = 0644, 1247 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1248 }, 1249 { 1250 .procname = "drop_caches", 1251 .data = &sysctl_drop_caches, 1252 .maxlen = sizeof(int), 1253 .mode = 0644, 1254 .proc_handler = drop_caches_sysctl_handler, 1255 .extra1 = &one, 1256 .extra2 = &three, 1257 }, 1258 #ifdef CONFIG_COMPACTION 1259 { 1260 .procname = "compact_memory", 1261 .data = &sysctl_compact_memory, 1262 .maxlen = sizeof(int), 1263 .mode = 0200, 1264 .proc_handler = sysctl_compaction_handler, 1265 }, 1266 { 1267 .procname = "extfrag_threshold", 1268 .data = &sysctl_extfrag_threshold, 1269 .maxlen = sizeof(int), 1270 .mode = 0644, 1271 .proc_handler = sysctl_extfrag_handler, 1272 .extra1 = &min_extfrag_threshold, 1273 .extra2 = &max_extfrag_threshold, 1274 }, 1275 1276 #endif /* CONFIG_COMPACTION */ 1277 { 1278 .procname = "min_free_kbytes", 1279 .data = &min_free_kbytes, 1280 .maxlen = sizeof(min_free_kbytes), 1281 .mode = 0644, 1282 .proc_handler = min_free_kbytes_sysctl_handler, 1283 .extra1 = &zero, 1284 }, 1285 { 1286 .procname = "percpu_pagelist_fraction", 1287 .data = &percpu_pagelist_fraction, 1288 .maxlen = sizeof(percpu_pagelist_fraction), 1289 .mode = 0644, 1290 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1291 .extra1 = &min_percpu_pagelist_fract, 1292 }, 1293 #ifdef CONFIG_MMU 1294 { 1295 .procname = "max_map_count", 1296 .data = &sysctl_max_map_count, 1297 .maxlen = sizeof(sysctl_max_map_count), 1298 .mode = 0644, 1299 .proc_handler = proc_dointvec_minmax, 1300 .extra1 = &zero, 1301 }, 1302 #else 1303 { 1304 .procname = "nr_trim_pages", 1305 .data = &sysctl_nr_trim_pages, 1306 .maxlen = sizeof(sysctl_nr_trim_pages), 1307 .mode = 0644, 1308 .proc_handler = proc_dointvec_minmax, 1309 .extra1 = &zero, 1310 }, 1311 #endif 1312 { 1313 .procname = "laptop_mode", 1314 .data = &laptop_mode, 1315 .maxlen = sizeof(laptop_mode), 1316 .mode = 0644, 1317 .proc_handler = proc_dointvec_jiffies, 1318 }, 1319 { 1320 .procname = "block_dump", 1321 .data = &block_dump, 1322 .maxlen = sizeof(block_dump), 1323 .mode = 0644, 1324 .proc_handler = proc_dointvec, 1325 .extra1 = &zero, 1326 }, 1327 { 1328 .procname = "vfs_cache_pressure", 1329 .data = &sysctl_vfs_cache_pressure, 1330 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1331 .mode = 0644, 1332 .proc_handler = proc_dointvec, 1333 .extra1 = &zero, 1334 }, 1335 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1336 { 1337 .procname = "legacy_va_layout", 1338 .data = &sysctl_legacy_va_layout, 1339 .maxlen = sizeof(sysctl_legacy_va_layout), 1340 .mode = 0644, 1341 .proc_handler = proc_dointvec, 1342 .extra1 = &zero, 1343 }, 1344 #endif 1345 #ifdef CONFIG_NUMA 1346 { 1347 .procname = "zone_reclaim_mode", 1348 .data = &zone_reclaim_mode, 1349 .maxlen = sizeof(zone_reclaim_mode), 1350 .mode = 0644, 1351 .proc_handler = proc_dointvec, 1352 .extra1 = &zero, 1353 }, 1354 { 1355 .procname = "min_unmapped_ratio", 1356 .data = &sysctl_min_unmapped_ratio, 1357 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1358 .mode = 0644, 1359 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1360 .extra1 = &zero, 1361 .extra2 = &one_hundred, 1362 }, 1363 { 1364 .procname = "min_slab_ratio", 1365 .data = &sysctl_min_slab_ratio, 1366 .maxlen = sizeof(sysctl_min_slab_ratio), 1367 .mode = 0644, 1368 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1369 .extra1 = &zero, 1370 .extra2 = &one_hundred, 1371 }, 1372 #endif 1373 #ifdef CONFIG_SMP 1374 { 1375 .procname = "stat_interval", 1376 .data = &sysctl_stat_interval, 1377 .maxlen = sizeof(sysctl_stat_interval), 1378 .mode = 0644, 1379 .proc_handler = proc_dointvec_jiffies, 1380 }, 1381 #endif 1382 #ifdef CONFIG_MMU 1383 { 1384 .procname = "mmap_min_addr", 1385 .data = &dac_mmap_min_addr, 1386 .maxlen = sizeof(unsigned long), 1387 .mode = 0644, 1388 .proc_handler = mmap_min_addr_handler, 1389 }, 1390 #endif 1391 #ifdef CONFIG_NUMA 1392 { 1393 .procname = "numa_zonelist_order", 1394 .data = &numa_zonelist_order, 1395 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1396 .mode = 0644, 1397 .proc_handler = numa_zonelist_order_handler, 1398 }, 1399 #endif 1400 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1401 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1402 { 1403 .procname = "vdso_enabled", 1404 .data = &vdso_enabled, 1405 .maxlen = sizeof(vdso_enabled), 1406 .mode = 0644, 1407 .proc_handler = proc_dointvec, 1408 .extra1 = &zero, 1409 }, 1410 #endif 1411 #ifdef CONFIG_HIGHMEM 1412 { 1413 .procname = "highmem_is_dirtyable", 1414 .data = &vm_highmem_is_dirtyable, 1415 .maxlen = sizeof(vm_highmem_is_dirtyable), 1416 .mode = 0644, 1417 .proc_handler = proc_dointvec_minmax, 1418 .extra1 = &zero, 1419 .extra2 = &one, 1420 }, 1421 #endif 1422 { 1423 .procname = "scan_unevictable_pages", 1424 .data = &scan_unevictable_pages, 1425 .maxlen = sizeof(scan_unevictable_pages), 1426 .mode = 0644, 1427 .proc_handler = scan_unevictable_handler, 1428 }, 1429 #ifdef CONFIG_MEMORY_FAILURE 1430 { 1431 .procname = "memory_failure_early_kill", 1432 .data = &sysctl_memory_failure_early_kill, 1433 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1434 .mode = 0644, 1435 .proc_handler = proc_dointvec_minmax, 1436 .extra1 = &zero, 1437 .extra2 = &one, 1438 }, 1439 { 1440 .procname = "memory_failure_recovery", 1441 .data = &sysctl_memory_failure_recovery, 1442 .maxlen = sizeof(sysctl_memory_failure_recovery), 1443 .mode = 0644, 1444 .proc_handler = proc_dointvec_minmax, 1445 .extra1 = &zero, 1446 .extra2 = &one, 1447 }, 1448 #endif 1449 { 1450 .procname = "user_reserve_kbytes", 1451 .data = &sysctl_user_reserve_kbytes, 1452 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1453 .mode = 0644, 1454 .proc_handler = proc_doulongvec_minmax, 1455 }, 1456 { 1457 .procname = "admin_reserve_kbytes", 1458 .data = &sysctl_admin_reserve_kbytes, 1459 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1460 .mode = 0644, 1461 .proc_handler = proc_doulongvec_minmax, 1462 }, 1463 { } 1464 }; 1465 1466 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1467 static struct ctl_table binfmt_misc_table[] = { 1468 { } 1469 }; 1470 #endif 1471 1472 static struct ctl_table fs_table[] = { 1473 { 1474 .procname = "inode-nr", 1475 .data = &inodes_stat, 1476 .maxlen = 2*sizeof(long), 1477 .mode = 0444, 1478 .proc_handler = proc_nr_inodes, 1479 }, 1480 { 1481 .procname = "inode-state", 1482 .data = &inodes_stat, 1483 .maxlen = 7*sizeof(long), 1484 .mode = 0444, 1485 .proc_handler = proc_nr_inodes, 1486 }, 1487 { 1488 .procname = "file-nr", 1489 .data = &files_stat, 1490 .maxlen = sizeof(files_stat), 1491 .mode = 0444, 1492 .proc_handler = proc_nr_files, 1493 }, 1494 { 1495 .procname = "file-max", 1496 .data = &files_stat.max_files, 1497 .maxlen = sizeof(files_stat.max_files), 1498 .mode = 0644, 1499 .proc_handler = proc_doulongvec_minmax, 1500 }, 1501 { 1502 .procname = "nr_open", 1503 .data = &sysctl_nr_open, 1504 .maxlen = sizeof(int), 1505 .mode = 0644, 1506 .proc_handler = proc_dointvec_minmax, 1507 .extra1 = &sysctl_nr_open_min, 1508 .extra2 = &sysctl_nr_open_max, 1509 }, 1510 { 1511 .procname = "dentry-state", 1512 .data = &dentry_stat, 1513 .maxlen = 6*sizeof(long), 1514 .mode = 0444, 1515 .proc_handler = proc_nr_dentry, 1516 }, 1517 { 1518 .procname = "overflowuid", 1519 .data = &fs_overflowuid, 1520 .maxlen = sizeof(int), 1521 .mode = 0644, 1522 .proc_handler = proc_dointvec_minmax, 1523 .extra1 = &minolduid, 1524 .extra2 = &maxolduid, 1525 }, 1526 { 1527 .procname = "overflowgid", 1528 .data = &fs_overflowgid, 1529 .maxlen = sizeof(int), 1530 .mode = 0644, 1531 .proc_handler = proc_dointvec_minmax, 1532 .extra1 = &minolduid, 1533 .extra2 = &maxolduid, 1534 }, 1535 #ifdef CONFIG_FILE_LOCKING 1536 { 1537 .procname = "leases-enable", 1538 .data = &leases_enable, 1539 .maxlen = sizeof(int), 1540 .mode = 0644, 1541 .proc_handler = proc_dointvec, 1542 }, 1543 #endif 1544 #ifdef CONFIG_DNOTIFY 1545 { 1546 .procname = "dir-notify-enable", 1547 .data = &dir_notify_enable, 1548 .maxlen = sizeof(int), 1549 .mode = 0644, 1550 .proc_handler = proc_dointvec, 1551 }, 1552 #endif 1553 #ifdef CONFIG_MMU 1554 #ifdef CONFIG_FILE_LOCKING 1555 { 1556 .procname = "lease-break-time", 1557 .data = &lease_break_time, 1558 .maxlen = sizeof(int), 1559 .mode = 0644, 1560 .proc_handler = proc_dointvec, 1561 }, 1562 #endif 1563 #ifdef CONFIG_AIO 1564 { 1565 .procname = "aio-nr", 1566 .data = &aio_nr, 1567 .maxlen = sizeof(aio_nr), 1568 .mode = 0444, 1569 .proc_handler = proc_doulongvec_minmax, 1570 }, 1571 { 1572 .procname = "aio-max-nr", 1573 .data = &aio_max_nr, 1574 .maxlen = sizeof(aio_max_nr), 1575 .mode = 0644, 1576 .proc_handler = proc_doulongvec_minmax, 1577 }, 1578 #endif /* CONFIG_AIO */ 1579 #ifdef CONFIG_INOTIFY_USER 1580 { 1581 .procname = "inotify", 1582 .mode = 0555, 1583 .child = inotify_table, 1584 }, 1585 #endif 1586 #ifdef CONFIG_EPOLL 1587 { 1588 .procname = "epoll", 1589 .mode = 0555, 1590 .child = epoll_table, 1591 }, 1592 #endif 1593 #endif 1594 { 1595 .procname = "protected_symlinks", 1596 .data = &sysctl_protected_symlinks, 1597 .maxlen = sizeof(int), 1598 .mode = 0600, 1599 .proc_handler = proc_dointvec_minmax, 1600 .extra1 = &zero, 1601 .extra2 = &one, 1602 }, 1603 { 1604 .procname = "protected_hardlinks", 1605 .data = &sysctl_protected_hardlinks, 1606 .maxlen = sizeof(int), 1607 .mode = 0600, 1608 .proc_handler = proc_dointvec_minmax, 1609 .extra1 = &zero, 1610 .extra2 = &one, 1611 }, 1612 { 1613 .procname = "suid_dumpable", 1614 .data = &suid_dumpable, 1615 .maxlen = sizeof(int), 1616 .mode = 0644, 1617 .proc_handler = proc_dointvec_minmax_coredump, 1618 .extra1 = &zero, 1619 .extra2 = &two, 1620 }, 1621 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1622 { 1623 .procname = "binfmt_misc", 1624 .mode = 0555, 1625 .child = binfmt_misc_table, 1626 }, 1627 #endif 1628 { 1629 .procname = "pipe-max-size", 1630 .data = &pipe_max_size, 1631 .maxlen = sizeof(int), 1632 .mode = 0644, 1633 .proc_handler = &pipe_proc_fn, 1634 .extra1 = &pipe_min_size, 1635 }, 1636 { } 1637 }; 1638 1639 static struct ctl_table debug_table[] = { 1640 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1641 { 1642 .procname = "exception-trace", 1643 .data = &show_unhandled_signals, 1644 .maxlen = sizeof(int), 1645 .mode = 0644, 1646 .proc_handler = proc_dointvec 1647 }, 1648 #endif 1649 #if defined(CONFIG_OPTPROBES) 1650 { 1651 .procname = "kprobes-optimization", 1652 .data = &sysctl_kprobes_optimization, 1653 .maxlen = sizeof(int), 1654 .mode = 0644, 1655 .proc_handler = proc_kprobes_optimization_handler, 1656 .extra1 = &zero, 1657 .extra2 = &one, 1658 }, 1659 #endif 1660 { } 1661 }; 1662 1663 static struct ctl_table dev_table[] = { 1664 { } 1665 }; 1666 1667 int __init sysctl_init(void) 1668 { 1669 struct ctl_table_header *hdr; 1670 1671 hdr = register_sysctl_table(sysctl_base_table); 1672 kmemleak_not_leak(hdr); 1673 return 0; 1674 } 1675 1676 #endif /* CONFIG_SYSCTL */ 1677 1678 /* 1679 * /proc/sys support 1680 */ 1681 1682 #ifdef CONFIG_PROC_SYSCTL 1683 1684 static int _proc_do_string(void* data, int maxlen, int write, 1685 void __user *buffer, 1686 size_t *lenp, loff_t *ppos) 1687 { 1688 size_t len; 1689 char __user *p; 1690 char c; 1691 1692 if (!data || !maxlen || !*lenp) { 1693 *lenp = 0; 1694 return 0; 1695 } 1696 1697 if (write) { 1698 len = 0; 1699 p = buffer; 1700 while (len < *lenp) { 1701 if (get_user(c, p++)) 1702 return -EFAULT; 1703 if (c == 0 || c == '\n') 1704 break; 1705 len++; 1706 } 1707 if (len >= maxlen) 1708 len = maxlen-1; 1709 if(copy_from_user(data, buffer, len)) 1710 return -EFAULT; 1711 ((char *) data)[len] = 0; 1712 *ppos += *lenp; 1713 } else { 1714 len = strlen(data); 1715 if (len > maxlen) 1716 len = maxlen; 1717 1718 if (*ppos > len) { 1719 *lenp = 0; 1720 return 0; 1721 } 1722 1723 data += *ppos; 1724 len -= *ppos; 1725 1726 if (len > *lenp) 1727 len = *lenp; 1728 if (len) 1729 if(copy_to_user(buffer, data, len)) 1730 return -EFAULT; 1731 if (len < *lenp) { 1732 if(put_user('\n', ((char __user *) buffer) + len)) 1733 return -EFAULT; 1734 len++; 1735 } 1736 *lenp = len; 1737 *ppos += len; 1738 } 1739 return 0; 1740 } 1741 1742 /** 1743 * proc_dostring - read a string sysctl 1744 * @table: the sysctl table 1745 * @write: %TRUE if this is a write to the sysctl file 1746 * @buffer: the user buffer 1747 * @lenp: the size of the user buffer 1748 * @ppos: file position 1749 * 1750 * Reads/writes a string from/to the user buffer. If the kernel 1751 * buffer provided is not large enough to hold the string, the 1752 * string is truncated. The copied string is %NULL-terminated. 1753 * If the string is being read by the user process, it is copied 1754 * and a newline '\n' is added. It is truncated if the buffer is 1755 * not large enough. 1756 * 1757 * Returns 0 on success. 1758 */ 1759 int proc_dostring(struct ctl_table *table, int write, 1760 void __user *buffer, size_t *lenp, loff_t *ppos) 1761 { 1762 return _proc_do_string(table->data, table->maxlen, write, 1763 buffer, lenp, ppos); 1764 } 1765 1766 static size_t proc_skip_spaces(char **buf) 1767 { 1768 size_t ret; 1769 char *tmp = skip_spaces(*buf); 1770 ret = tmp - *buf; 1771 *buf = tmp; 1772 return ret; 1773 } 1774 1775 static void proc_skip_char(char **buf, size_t *size, const char v) 1776 { 1777 while (*size) { 1778 if (**buf != v) 1779 break; 1780 (*size)--; 1781 (*buf)++; 1782 } 1783 } 1784 1785 #define TMPBUFLEN 22 1786 /** 1787 * proc_get_long - reads an ASCII formatted integer from a user buffer 1788 * 1789 * @buf: a kernel buffer 1790 * @size: size of the kernel buffer 1791 * @val: this is where the number will be stored 1792 * @neg: set to %TRUE if number is negative 1793 * @perm_tr: a vector which contains the allowed trailers 1794 * @perm_tr_len: size of the perm_tr vector 1795 * @tr: pointer to store the trailer character 1796 * 1797 * In case of success %0 is returned and @buf and @size are updated with 1798 * the amount of bytes read. If @tr is non-NULL and a trailing 1799 * character exists (size is non-zero after returning from this 1800 * function), @tr is updated with the trailing character. 1801 */ 1802 static int proc_get_long(char **buf, size_t *size, 1803 unsigned long *val, bool *neg, 1804 const char *perm_tr, unsigned perm_tr_len, char *tr) 1805 { 1806 int len; 1807 char *p, tmp[TMPBUFLEN]; 1808 1809 if (!*size) 1810 return -EINVAL; 1811 1812 len = *size; 1813 if (len > TMPBUFLEN - 1) 1814 len = TMPBUFLEN - 1; 1815 1816 memcpy(tmp, *buf, len); 1817 1818 tmp[len] = 0; 1819 p = tmp; 1820 if (*p == '-' && *size > 1) { 1821 *neg = true; 1822 p++; 1823 } else 1824 *neg = false; 1825 if (!isdigit(*p)) 1826 return -EINVAL; 1827 1828 *val = simple_strtoul(p, &p, 0); 1829 1830 len = p - tmp; 1831 1832 /* We don't know if the next char is whitespace thus we may accept 1833 * invalid integers (e.g. 1234...a) or two integers instead of one 1834 * (e.g. 123...1). So lets not allow such large numbers. */ 1835 if (len == TMPBUFLEN - 1) 1836 return -EINVAL; 1837 1838 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1839 return -EINVAL; 1840 1841 if (tr && (len < *size)) 1842 *tr = *p; 1843 1844 *buf += len; 1845 *size -= len; 1846 1847 return 0; 1848 } 1849 1850 /** 1851 * proc_put_long - converts an integer to a decimal ASCII formatted string 1852 * 1853 * @buf: the user buffer 1854 * @size: the size of the user buffer 1855 * @val: the integer to be converted 1856 * @neg: sign of the number, %TRUE for negative 1857 * 1858 * In case of success %0 is returned and @buf and @size are updated with 1859 * the amount of bytes written. 1860 */ 1861 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1862 bool neg) 1863 { 1864 int len; 1865 char tmp[TMPBUFLEN], *p = tmp; 1866 1867 sprintf(p, "%s%lu", neg ? "-" : "", val); 1868 len = strlen(tmp); 1869 if (len > *size) 1870 len = *size; 1871 if (copy_to_user(*buf, tmp, len)) 1872 return -EFAULT; 1873 *size -= len; 1874 *buf += len; 1875 return 0; 1876 } 1877 #undef TMPBUFLEN 1878 1879 static int proc_put_char(void __user **buf, size_t *size, char c) 1880 { 1881 if (*size) { 1882 char __user **buffer = (char __user **)buf; 1883 if (put_user(c, *buffer)) 1884 return -EFAULT; 1885 (*size)--, (*buffer)++; 1886 *buf = *buffer; 1887 } 1888 return 0; 1889 } 1890 1891 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1892 int *valp, 1893 int write, void *data) 1894 { 1895 if (write) { 1896 *valp = *negp ? -*lvalp : *lvalp; 1897 } else { 1898 int val = *valp; 1899 if (val < 0) { 1900 *negp = true; 1901 *lvalp = (unsigned long)-val; 1902 } else { 1903 *negp = false; 1904 *lvalp = (unsigned long)val; 1905 } 1906 } 1907 return 0; 1908 } 1909 1910 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1911 1912 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1913 int write, void __user *buffer, 1914 size_t *lenp, loff_t *ppos, 1915 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1916 int write, void *data), 1917 void *data) 1918 { 1919 int *i, vleft, first = 1, err = 0; 1920 unsigned long page = 0; 1921 size_t left; 1922 char *kbuf; 1923 1924 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1925 *lenp = 0; 1926 return 0; 1927 } 1928 1929 i = (int *) tbl_data; 1930 vleft = table->maxlen / sizeof(*i); 1931 left = *lenp; 1932 1933 if (!conv) 1934 conv = do_proc_dointvec_conv; 1935 1936 if (write) { 1937 if (left > PAGE_SIZE - 1) 1938 left = PAGE_SIZE - 1; 1939 page = __get_free_page(GFP_TEMPORARY); 1940 kbuf = (char *) page; 1941 if (!kbuf) 1942 return -ENOMEM; 1943 if (copy_from_user(kbuf, buffer, left)) { 1944 err = -EFAULT; 1945 goto free; 1946 } 1947 kbuf[left] = 0; 1948 } 1949 1950 for (; left && vleft--; i++, first=0) { 1951 unsigned long lval; 1952 bool neg; 1953 1954 if (write) { 1955 left -= proc_skip_spaces(&kbuf); 1956 1957 if (!left) 1958 break; 1959 err = proc_get_long(&kbuf, &left, &lval, &neg, 1960 proc_wspace_sep, 1961 sizeof(proc_wspace_sep), NULL); 1962 if (err) 1963 break; 1964 if (conv(&neg, &lval, i, 1, data)) { 1965 err = -EINVAL; 1966 break; 1967 } 1968 } else { 1969 if (conv(&neg, &lval, i, 0, data)) { 1970 err = -EINVAL; 1971 break; 1972 } 1973 if (!first) 1974 err = proc_put_char(&buffer, &left, '\t'); 1975 if (err) 1976 break; 1977 err = proc_put_long(&buffer, &left, lval, neg); 1978 if (err) 1979 break; 1980 } 1981 } 1982 1983 if (!write && !first && left && !err) 1984 err = proc_put_char(&buffer, &left, '\n'); 1985 if (write && !err && left) 1986 left -= proc_skip_spaces(&kbuf); 1987 free: 1988 if (write) { 1989 free_page(page); 1990 if (first) 1991 return err ? : -EINVAL; 1992 } 1993 *lenp -= left; 1994 *ppos += *lenp; 1995 return err; 1996 } 1997 1998 static int do_proc_dointvec(struct ctl_table *table, int write, 1999 void __user *buffer, size_t *lenp, loff_t *ppos, 2000 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2001 int write, void *data), 2002 void *data) 2003 { 2004 return __do_proc_dointvec(table->data, table, write, 2005 buffer, lenp, ppos, conv, data); 2006 } 2007 2008 /** 2009 * proc_dointvec - read a vector of integers 2010 * @table: the sysctl table 2011 * @write: %TRUE if this is a write to the sysctl file 2012 * @buffer: the user buffer 2013 * @lenp: the size of the user buffer 2014 * @ppos: file position 2015 * 2016 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2017 * values from/to the user buffer, treated as an ASCII string. 2018 * 2019 * Returns 0 on success. 2020 */ 2021 int proc_dointvec(struct ctl_table *table, int write, 2022 void __user *buffer, size_t *lenp, loff_t *ppos) 2023 { 2024 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2025 NULL,NULL); 2026 } 2027 2028 /* 2029 * Taint values can only be increased 2030 * This means we can safely use a temporary. 2031 */ 2032 static int proc_taint(struct ctl_table *table, int write, 2033 void __user *buffer, size_t *lenp, loff_t *ppos) 2034 { 2035 struct ctl_table t; 2036 unsigned long tmptaint = get_taint(); 2037 int err; 2038 2039 if (write && !capable(CAP_SYS_ADMIN)) 2040 return -EPERM; 2041 2042 t = *table; 2043 t.data = &tmptaint; 2044 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2045 if (err < 0) 2046 return err; 2047 2048 if (write) { 2049 /* 2050 * Poor man's atomic or. Not worth adding a primitive 2051 * to everyone's atomic.h for this 2052 */ 2053 int i; 2054 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2055 if ((tmptaint >> i) & 1) 2056 add_taint(i, LOCKDEP_STILL_OK); 2057 } 2058 } 2059 2060 return err; 2061 } 2062 2063 #ifdef CONFIG_PRINTK 2064 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2065 void __user *buffer, size_t *lenp, loff_t *ppos) 2066 { 2067 if (write && !capable(CAP_SYS_ADMIN)) 2068 return -EPERM; 2069 2070 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2071 } 2072 #endif 2073 2074 struct do_proc_dointvec_minmax_conv_param { 2075 int *min; 2076 int *max; 2077 }; 2078 2079 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2080 int *valp, 2081 int write, void *data) 2082 { 2083 struct do_proc_dointvec_minmax_conv_param *param = data; 2084 if (write) { 2085 int val = *negp ? -*lvalp : *lvalp; 2086 if ((param->min && *param->min > val) || 2087 (param->max && *param->max < val)) 2088 return -EINVAL; 2089 *valp = val; 2090 } else { 2091 int val = *valp; 2092 if (val < 0) { 2093 *negp = true; 2094 *lvalp = (unsigned long)-val; 2095 } else { 2096 *negp = false; 2097 *lvalp = (unsigned long)val; 2098 } 2099 } 2100 return 0; 2101 } 2102 2103 /** 2104 * proc_dointvec_minmax - read a vector of integers with min/max values 2105 * @table: the sysctl table 2106 * @write: %TRUE if this is a write to the sysctl file 2107 * @buffer: the user buffer 2108 * @lenp: the size of the user buffer 2109 * @ppos: file position 2110 * 2111 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2112 * values from/to the user buffer, treated as an ASCII string. 2113 * 2114 * This routine will ensure the values are within the range specified by 2115 * table->extra1 (min) and table->extra2 (max). 2116 * 2117 * Returns 0 on success. 2118 */ 2119 int proc_dointvec_minmax(struct ctl_table *table, int write, 2120 void __user *buffer, size_t *lenp, loff_t *ppos) 2121 { 2122 struct do_proc_dointvec_minmax_conv_param param = { 2123 .min = (int *) table->extra1, 2124 .max = (int *) table->extra2, 2125 }; 2126 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2127 do_proc_dointvec_minmax_conv, ¶m); 2128 } 2129 2130 static void validate_coredump_safety(void) 2131 { 2132 #ifdef CONFIG_COREDUMP 2133 if (suid_dumpable == SUID_DUMP_ROOT && 2134 core_pattern[0] != '/' && core_pattern[0] != '|') { 2135 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2136 "suid_dumpable=2. Pipe handler or fully qualified "\ 2137 "core dump path required.\n"); 2138 } 2139 #endif 2140 } 2141 2142 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2143 void __user *buffer, size_t *lenp, loff_t *ppos) 2144 { 2145 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2146 if (!error) 2147 validate_coredump_safety(); 2148 return error; 2149 } 2150 2151 #ifdef CONFIG_COREDUMP 2152 static int proc_dostring_coredump(struct ctl_table *table, int write, 2153 void __user *buffer, size_t *lenp, loff_t *ppos) 2154 { 2155 int error = proc_dostring(table, write, buffer, lenp, ppos); 2156 if (!error) 2157 validate_coredump_safety(); 2158 return error; 2159 } 2160 #endif 2161 2162 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2163 void __user *buffer, 2164 size_t *lenp, loff_t *ppos, 2165 unsigned long convmul, 2166 unsigned long convdiv) 2167 { 2168 unsigned long *i, *min, *max; 2169 int vleft, first = 1, err = 0; 2170 unsigned long page = 0; 2171 size_t left; 2172 char *kbuf; 2173 2174 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2175 *lenp = 0; 2176 return 0; 2177 } 2178 2179 i = (unsigned long *) data; 2180 min = (unsigned long *) table->extra1; 2181 max = (unsigned long *) table->extra2; 2182 vleft = table->maxlen / sizeof(unsigned long); 2183 left = *lenp; 2184 2185 if (write) { 2186 if (left > PAGE_SIZE - 1) 2187 left = PAGE_SIZE - 1; 2188 page = __get_free_page(GFP_TEMPORARY); 2189 kbuf = (char *) page; 2190 if (!kbuf) 2191 return -ENOMEM; 2192 if (copy_from_user(kbuf, buffer, left)) { 2193 err = -EFAULT; 2194 goto free; 2195 } 2196 kbuf[left] = 0; 2197 } 2198 2199 for (; left && vleft--; i++, first = 0) { 2200 unsigned long val; 2201 2202 if (write) { 2203 bool neg; 2204 2205 left -= proc_skip_spaces(&kbuf); 2206 2207 err = proc_get_long(&kbuf, &left, &val, &neg, 2208 proc_wspace_sep, 2209 sizeof(proc_wspace_sep), NULL); 2210 if (err) 2211 break; 2212 if (neg) 2213 continue; 2214 if ((min && val < *min) || (max && val > *max)) 2215 continue; 2216 *i = val; 2217 } else { 2218 val = convdiv * (*i) / convmul; 2219 if (!first) { 2220 err = proc_put_char(&buffer, &left, '\t'); 2221 if (err) 2222 break; 2223 } 2224 err = proc_put_long(&buffer, &left, val, false); 2225 if (err) 2226 break; 2227 } 2228 } 2229 2230 if (!write && !first && left && !err) 2231 err = proc_put_char(&buffer, &left, '\n'); 2232 if (write && !err) 2233 left -= proc_skip_spaces(&kbuf); 2234 free: 2235 if (write) { 2236 free_page(page); 2237 if (first) 2238 return err ? : -EINVAL; 2239 } 2240 *lenp -= left; 2241 *ppos += *lenp; 2242 return err; 2243 } 2244 2245 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2246 void __user *buffer, 2247 size_t *lenp, loff_t *ppos, 2248 unsigned long convmul, 2249 unsigned long convdiv) 2250 { 2251 return __do_proc_doulongvec_minmax(table->data, table, write, 2252 buffer, lenp, ppos, convmul, convdiv); 2253 } 2254 2255 /** 2256 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2257 * @table: the sysctl table 2258 * @write: %TRUE if this is a write to the sysctl file 2259 * @buffer: the user buffer 2260 * @lenp: the size of the user buffer 2261 * @ppos: file position 2262 * 2263 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2264 * values from/to the user buffer, treated as an ASCII string. 2265 * 2266 * This routine will ensure the values are within the range specified by 2267 * table->extra1 (min) and table->extra2 (max). 2268 * 2269 * Returns 0 on success. 2270 */ 2271 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2272 void __user *buffer, size_t *lenp, loff_t *ppos) 2273 { 2274 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2275 } 2276 2277 /** 2278 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2279 * @table: the sysctl table 2280 * @write: %TRUE if this is a write to the sysctl file 2281 * @buffer: the user buffer 2282 * @lenp: the size of the user buffer 2283 * @ppos: file position 2284 * 2285 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2286 * values from/to the user buffer, treated as an ASCII string. The values 2287 * are treated as milliseconds, and converted to jiffies when they are stored. 2288 * 2289 * This routine will ensure the values are within the range specified by 2290 * table->extra1 (min) and table->extra2 (max). 2291 * 2292 * Returns 0 on success. 2293 */ 2294 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2295 void __user *buffer, 2296 size_t *lenp, loff_t *ppos) 2297 { 2298 return do_proc_doulongvec_minmax(table, write, buffer, 2299 lenp, ppos, HZ, 1000l); 2300 } 2301 2302 2303 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2304 int *valp, 2305 int write, void *data) 2306 { 2307 if (write) { 2308 if (*lvalp > LONG_MAX / HZ) 2309 return 1; 2310 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2311 } else { 2312 int val = *valp; 2313 unsigned long lval; 2314 if (val < 0) { 2315 *negp = true; 2316 lval = (unsigned long)-val; 2317 } else { 2318 *negp = false; 2319 lval = (unsigned long)val; 2320 } 2321 *lvalp = lval / HZ; 2322 } 2323 return 0; 2324 } 2325 2326 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2327 int *valp, 2328 int write, void *data) 2329 { 2330 if (write) { 2331 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2332 return 1; 2333 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2334 } else { 2335 int val = *valp; 2336 unsigned long lval; 2337 if (val < 0) { 2338 *negp = true; 2339 lval = (unsigned long)-val; 2340 } else { 2341 *negp = false; 2342 lval = (unsigned long)val; 2343 } 2344 *lvalp = jiffies_to_clock_t(lval); 2345 } 2346 return 0; 2347 } 2348 2349 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2350 int *valp, 2351 int write, void *data) 2352 { 2353 if (write) { 2354 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2355 2356 if (jif > INT_MAX) 2357 return 1; 2358 *valp = (int)jif; 2359 } else { 2360 int val = *valp; 2361 unsigned long lval; 2362 if (val < 0) { 2363 *negp = true; 2364 lval = (unsigned long)-val; 2365 } else { 2366 *negp = false; 2367 lval = (unsigned long)val; 2368 } 2369 *lvalp = jiffies_to_msecs(lval); 2370 } 2371 return 0; 2372 } 2373 2374 /** 2375 * proc_dointvec_jiffies - read a vector of integers as seconds 2376 * @table: the sysctl table 2377 * @write: %TRUE if this is a write to the sysctl file 2378 * @buffer: the user buffer 2379 * @lenp: the size of the user buffer 2380 * @ppos: file position 2381 * 2382 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2383 * values from/to the user buffer, treated as an ASCII string. 2384 * The values read are assumed to be in seconds, and are converted into 2385 * jiffies. 2386 * 2387 * Returns 0 on success. 2388 */ 2389 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2390 void __user *buffer, size_t *lenp, loff_t *ppos) 2391 { 2392 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2393 do_proc_dointvec_jiffies_conv,NULL); 2394 } 2395 2396 /** 2397 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2398 * @table: the sysctl table 2399 * @write: %TRUE if this is a write to the sysctl file 2400 * @buffer: the user buffer 2401 * @lenp: the size of the user buffer 2402 * @ppos: pointer to the file position 2403 * 2404 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2405 * values from/to the user buffer, treated as an ASCII string. 2406 * The values read are assumed to be in 1/USER_HZ seconds, and 2407 * are converted into jiffies. 2408 * 2409 * Returns 0 on success. 2410 */ 2411 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2412 void __user *buffer, size_t *lenp, loff_t *ppos) 2413 { 2414 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2415 do_proc_dointvec_userhz_jiffies_conv,NULL); 2416 } 2417 2418 /** 2419 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2420 * @table: the sysctl table 2421 * @write: %TRUE if this is a write to the sysctl file 2422 * @buffer: the user buffer 2423 * @lenp: the size of the user buffer 2424 * @ppos: file position 2425 * @ppos: the current position in the file 2426 * 2427 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2428 * values from/to the user buffer, treated as an ASCII string. 2429 * The values read are assumed to be in 1/1000 seconds, and 2430 * are converted into jiffies. 2431 * 2432 * Returns 0 on success. 2433 */ 2434 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2435 void __user *buffer, size_t *lenp, loff_t *ppos) 2436 { 2437 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2438 do_proc_dointvec_ms_jiffies_conv, NULL); 2439 } 2440 2441 static int proc_do_cad_pid(struct ctl_table *table, int write, 2442 void __user *buffer, size_t *lenp, loff_t *ppos) 2443 { 2444 struct pid *new_pid; 2445 pid_t tmp; 2446 int r; 2447 2448 tmp = pid_vnr(cad_pid); 2449 2450 r = __do_proc_dointvec(&tmp, table, write, buffer, 2451 lenp, ppos, NULL, NULL); 2452 if (r || !write) 2453 return r; 2454 2455 new_pid = find_get_pid(tmp); 2456 if (!new_pid) 2457 return -ESRCH; 2458 2459 put_pid(xchg(&cad_pid, new_pid)); 2460 return 0; 2461 } 2462 2463 /** 2464 * proc_do_large_bitmap - read/write from/to a large bitmap 2465 * @table: the sysctl table 2466 * @write: %TRUE if this is a write to the sysctl file 2467 * @buffer: the user buffer 2468 * @lenp: the size of the user buffer 2469 * @ppos: file position 2470 * 2471 * The bitmap is stored at table->data and the bitmap length (in bits) 2472 * in table->maxlen. 2473 * 2474 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2475 * large bitmaps may be represented in a compact manner. Writing into 2476 * the file will clear the bitmap then update it with the given input. 2477 * 2478 * Returns 0 on success. 2479 */ 2480 int proc_do_large_bitmap(struct ctl_table *table, int write, 2481 void __user *buffer, size_t *lenp, loff_t *ppos) 2482 { 2483 int err = 0; 2484 bool first = 1; 2485 size_t left = *lenp; 2486 unsigned long bitmap_len = table->maxlen; 2487 unsigned long *bitmap = (unsigned long *) table->data; 2488 unsigned long *tmp_bitmap = NULL; 2489 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2490 2491 if (!bitmap_len || !left || (*ppos && !write)) { 2492 *lenp = 0; 2493 return 0; 2494 } 2495 2496 if (write) { 2497 unsigned long page = 0; 2498 char *kbuf; 2499 2500 if (left > PAGE_SIZE - 1) 2501 left = PAGE_SIZE - 1; 2502 2503 page = __get_free_page(GFP_TEMPORARY); 2504 kbuf = (char *) page; 2505 if (!kbuf) 2506 return -ENOMEM; 2507 if (copy_from_user(kbuf, buffer, left)) { 2508 free_page(page); 2509 return -EFAULT; 2510 } 2511 kbuf[left] = 0; 2512 2513 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2514 GFP_KERNEL); 2515 if (!tmp_bitmap) { 2516 free_page(page); 2517 return -ENOMEM; 2518 } 2519 proc_skip_char(&kbuf, &left, '\n'); 2520 while (!err && left) { 2521 unsigned long val_a, val_b; 2522 bool neg; 2523 2524 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2525 sizeof(tr_a), &c); 2526 if (err) 2527 break; 2528 if (val_a >= bitmap_len || neg) { 2529 err = -EINVAL; 2530 break; 2531 } 2532 2533 val_b = val_a; 2534 if (left) { 2535 kbuf++; 2536 left--; 2537 } 2538 2539 if (c == '-') { 2540 err = proc_get_long(&kbuf, &left, &val_b, 2541 &neg, tr_b, sizeof(tr_b), 2542 &c); 2543 if (err) 2544 break; 2545 if (val_b >= bitmap_len || neg || 2546 val_a > val_b) { 2547 err = -EINVAL; 2548 break; 2549 } 2550 if (left) { 2551 kbuf++; 2552 left--; 2553 } 2554 } 2555 2556 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2557 first = 0; 2558 proc_skip_char(&kbuf, &left, '\n'); 2559 } 2560 free_page(page); 2561 } else { 2562 unsigned long bit_a, bit_b = 0; 2563 2564 while (left) { 2565 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2566 if (bit_a >= bitmap_len) 2567 break; 2568 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2569 bit_a + 1) - 1; 2570 2571 if (!first) { 2572 err = proc_put_char(&buffer, &left, ','); 2573 if (err) 2574 break; 2575 } 2576 err = proc_put_long(&buffer, &left, bit_a, false); 2577 if (err) 2578 break; 2579 if (bit_a != bit_b) { 2580 err = proc_put_char(&buffer, &left, '-'); 2581 if (err) 2582 break; 2583 err = proc_put_long(&buffer, &left, bit_b, false); 2584 if (err) 2585 break; 2586 } 2587 2588 first = 0; bit_b++; 2589 } 2590 if (!err) 2591 err = proc_put_char(&buffer, &left, '\n'); 2592 } 2593 2594 if (!err) { 2595 if (write) { 2596 if (*ppos) 2597 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2598 else 2599 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2600 } 2601 kfree(tmp_bitmap); 2602 *lenp -= left; 2603 *ppos += *lenp; 2604 return 0; 2605 } else { 2606 kfree(tmp_bitmap); 2607 return err; 2608 } 2609 } 2610 2611 #else /* CONFIG_PROC_SYSCTL */ 2612 2613 int proc_dostring(struct ctl_table *table, int write, 2614 void __user *buffer, size_t *lenp, loff_t *ppos) 2615 { 2616 return -ENOSYS; 2617 } 2618 2619 int proc_dointvec(struct ctl_table *table, int write, 2620 void __user *buffer, size_t *lenp, loff_t *ppos) 2621 { 2622 return -ENOSYS; 2623 } 2624 2625 int proc_dointvec_minmax(struct ctl_table *table, int write, 2626 void __user *buffer, size_t *lenp, loff_t *ppos) 2627 { 2628 return -ENOSYS; 2629 } 2630 2631 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2632 void __user *buffer, size_t *lenp, loff_t *ppos) 2633 { 2634 return -ENOSYS; 2635 } 2636 2637 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2638 void __user *buffer, size_t *lenp, loff_t *ppos) 2639 { 2640 return -ENOSYS; 2641 } 2642 2643 int proc_dointvec_ms_jiffies(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_doulongvec_minmax(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_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2656 void __user *buffer, 2657 size_t *lenp, loff_t *ppos) 2658 { 2659 return -ENOSYS; 2660 } 2661 2662 2663 #endif /* CONFIG_PROC_SYSCTL */ 2664 2665 /* 2666 * No sense putting this after each symbol definition, twice, 2667 * exception granted :-) 2668 */ 2669 EXPORT_SYMBOL(proc_dointvec); 2670 EXPORT_SYMBOL(proc_dointvec_jiffies); 2671 EXPORT_SYMBOL(proc_dointvec_minmax); 2672 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2673 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2674 EXPORT_SYMBOL(proc_dostring); 2675 EXPORT_SYMBOL(proc_doulongvec_minmax); 2676 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2677