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