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 = 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_reset", 375 .data = &sysctl_numa_balancing_scan_period_reset, 376 .maxlen = sizeof(unsigned int), 377 .mode = 0644, 378 .proc_handler = proc_dointvec, 379 }, 380 { 381 .procname = "numa_balancing_scan_period_max_ms", 382 .data = &sysctl_numa_balancing_scan_period_max, 383 .maxlen = sizeof(unsigned int), 384 .mode = 0644, 385 .proc_handler = proc_dointvec, 386 }, 387 { 388 .procname = "numa_balancing_scan_size_mb", 389 .data = &sysctl_numa_balancing_scan_size, 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(unsigned long), 966 .mode = 0644, 967 .proc_handler = proc_doulongvec_minmax, 968 }, 969 { 970 .procname = "hung_task_timeout_secs", 971 .data = &sysctl_hung_task_timeout_secs, 972 .maxlen = sizeof(unsigned long), 973 .mode = 0644, 974 .proc_handler = proc_dohung_task_timeout_secs, 975 }, 976 { 977 .procname = "hung_task_warnings", 978 .data = &sysctl_hung_task_warnings, 979 .maxlen = sizeof(unsigned long), 980 .mode = 0644, 981 .proc_handler = proc_doulongvec_minmax, 982 }, 983 #endif 984 #ifdef CONFIG_COMPAT 985 { 986 .procname = "compat-log", 987 .data = &compat_log, 988 .maxlen = sizeof (int), 989 .mode = 0644, 990 .proc_handler = proc_dointvec, 991 }, 992 #endif 993 #ifdef CONFIG_RT_MUTEXES 994 { 995 .procname = "max_lock_depth", 996 .data = &max_lock_depth, 997 .maxlen = sizeof(int), 998 .mode = 0644, 999 .proc_handler = proc_dointvec, 1000 }, 1001 #endif 1002 { 1003 .procname = "poweroff_cmd", 1004 .data = &poweroff_cmd, 1005 .maxlen = POWEROFF_CMD_PATH_LEN, 1006 .mode = 0644, 1007 .proc_handler = proc_dostring, 1008 }, 1009 #ifdef CONFIG_KEYS 1010 { 1011 .procname = "keys", 1012 .mode = 0555, 1013 .child = key_sysctls, 1014 }, 1015 #endif 1016 #ifdef CONFIG_RCU_TORTURE_TEST 1017 { 1018 .procname = "rcutorture_runnable", 1019 .data = &rcutorture_runnable, 1020 .maxlen = sizeof(int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec, 1023 }, 1024 #endif 1025 #ifdef CONFIG_PERF_EVENTS 1026 /* 1027 * User-space scripts rely on the existence of this file 1028 * as a feature check for perf_events being enabled. 1029 * 1030 * So it's an ABI, do not remove! 1031 */ 1032 { 1033 .procname = "perf_event_paranoid", 1034 .data = &sysctl_perf_event_paranoid, 1035 .maxlen = sizeof(sysctl_perf_event_paranoid), 1036 .mode = 0644, 1037 .proc_handler = proc_dointvec, 1038 }, 1039 { 1040 .procname = "perf_event_mlock_kb", 1041 .data = &sysctl_perf_event_mlock, 1042 .maxlen = sizeof(sysctl_perf_event_mlock), 1043 .mode = 0644, 1044 .proc_handler = proc_dointvec, 1045 }, 1046 { 1047 .procname = "perf_event_max_sample_rate", 1048 .data = &sysctl_perf_event_sample_rate, 1049 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1050 .mode = 0644, 1051 .proc_handler = perf_proc_update_handler, 1052 }, 1053 { 1054 .procname = "perf_cpu_time_max_percent", 1055 .data = &sysctl_perf_cpu_time_max_percent, 1056 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1057 .mode = 0644, 1058 .proc_handler = perf_cpu_time_max_percent_handler, 1059 .extra1 = &zero, 1060 .extra2 = &one_hundred, 1061 }, 1062 #endif 1063 #ifdef CONFIG_KMEMCHECK 1064 { 1065 .procname = "kmemcheck", 1066 .data = &kmemcheck_enabled, 1067 .maxlen = sizeof(int), 1068 .mode = 0644, 1069 .proc_handler = proc_dointvec, 1070 }, 1071 #endif 1072 #ifdef CONFIG_BLOCK 1073 { 1074 .procname = "blk_iopoll", 1075 .data = &blk_iopoll_enabled, 1076 .maxlen = sizeof(int), 1077 .mode = 0644, 1078 .proc_handler = proc_dointvec, 1079 }, 1080 #endif 1081 { } 1082 }; 1083 1084 static struct ctl_table vm_table[] = { 1085 { 1086 .procname = "overcommit_memory", 1087 .data = &sysctl_overcommit_memory, 1088 .maxlen = sizeof(sysctl_overcommit_memory), 1089 .mode = 0644, 1090 .proc_handler = proc_dointvec_minmax, 1091 .extra1 = &zero, 1092 .extra2 = &two, 1093 }, 1094 { 1095 .procname = "panic_on_oom", 1096 .data = &sysctl_panic_on_oom, 1097 .maxlen = sizeof(sysctl_panic_on_oom), 1098 .mode = 0644, 1099 .proc_handler = proc_dointvec_minmax, 1100 .extra1 = &zero, 1101 .extra2 = &two, 1102 }, 1103 { 1104 .procname = "oom_kill_allocating_task", 1105 .data = &sysctl_oom_kill_allocating_task, 1106 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1107 .mode = 0644, 1108 .proc_handler = proc_dointvec, 1109 }, 1110 { 1111 .procname = "oom_dump_tasks", 1112 .data = &sysctl_oom_dump_tasks, 1113 .maxlen = sizeof(sysctl_oom_dump_tasks), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec, 1116 }, 1117 { 1118 .procname = "overcommit_ratio", 1119 .data = &sysctl_overcommit_ratio, 1120 .maxlen = sizeof(sysctl_overcommit_ratio), 1121 .mode = 0644, 1122 .proc_handler = proc_dointvec, 1123 }, 1124 { 1125 .procname = "page-cluster", 1126 .data = &page_cluster, 1127 .maxlen = sizeof(int), 1128 .mode = 0644, 1129 .proc_handler = proc_dointvec_minmax, 1130 .extra1 = &zero, 1131 }, 1132 { 1133 .procname = "dirty_background_ratio", 1134 .data = &dirty_background_ratio, 1135 .maxlen = sizeof(dirty_background_ratio), 1136 .mode = 0644, 1137 .proc_handler = dirty_background_ratio_handler, 1138 .extra1 = &zero, 1139 .extra2 = &one_hundred, 1140 }, 1141 { 1142 .procname = "dirty_background_bytes", 1143 .data = &dirty_background_bytes, 1144 .maxlen = sizeof(dirty_background_bytes), 1145 .mode = 0644, 1146 .proc_handler = dirty_background_bytes_handler, 1147 .extra1 = &one_ul, 1148 }, 1149 { 1150 .procname = "dirty_ratio", 1151 .data = &vm_dirty_ratio, 1152 .maxlen = sizeof(vm_dirty_ratio), 1153 .mode = 0644, 1154 .proc_handler = dirty_ratio_handler, 1155 .extra1 = &zero, 1156 .extra2 = &one_hundred, 1157 }, 1158 { 1159 .procname = "dirty_bytes", 1160 .data = &vm_dirty_bytes, 1161 .maxlen = sizeof(vm_dirty_bytes), 1162 .mode = 0644, 1163 .proc_handler = dirty_bytes_handler, 1164 .extra1 = &dirty_bytes_min, 1165 }, 1166 { 1167 .procname = "dirty_writeback_centisecs", 1168 .data = &dirty_writeback_interval, 1169 .maxlen = sizeof(dirty_writeback_interval), 1170 .mode = 0644, 1171 .proc_handler = dirty_writeback_centisecs_handler, 1172 }, 1173 { 1174 .procname = "dirty_expire_centisecs", 1175 .data = &dirty_expire_interval, 1176 .maxlen = sizeof(dirty_expire_interval), 1177 .mode = 0644, 1178 .proc_handler = proc_dointvec_minmax, 1179 .extra1 = &zero, 1180 }, 1181 { 1182 .procname = "nr_pdflush_threads", 1183 .mode = 0444 /* read-only */, 1184 .proc_handler = pdflush_proc_obsolete, 1185 }, 1186 { 1187 .procname = "swappiness", 1188 .data = &vm_swappiness, 1189 .maxlen = sizeof(vm_swappiness), 1190 .mode = 0644, 1191 .proc_handler = proc_dointvec_minmax, 1192 .extra1 = &zero, 1193 .extra2 = &one_hundred, 1194 }, 1195 #ifdef CONFIG_HUGETLB_PAGE 1196 { 1197 .procname = "nr_hugepages", 1198 .data = NULL, 1199 .maxlen = sizeof(unsigned long), 1200 .mode = 0644, 1201 .proc_handler = hugetlb_sysctl_handler, 1202 .extra1 = (void *)&hugetlb_zero, 1203 .extra2 = (void *)&hugetlb_infinity, 1204 }, 1205 #ifdef CONFIG_NUMA 1206 { 1207 .procname = "nr_hugepages_mempolicy", 1208 .data = NULL, 1209 .maxlen = sizeof(unsigned long), 1210 .mode = 0644, 1211 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1212 .extra1 = (void *)&hugetlb_zero, 1213 .extra2 = (void *)&hugetlb_infinity, 1214 }, 1215 #endif 1216 { 1217 .procname = "hugetlb_shm_group", 1218 .data = &sysctl_hugetlb_shm_group, 1219 .maxlen = sizeof(gid_t), 1220 .mode = 0644, 1221 .proc_handler = proc_dointvec, 1222 }, 1223 { 1224 .procname = "hugepages_treat_as_movable", 1225 .data = &hugepages_treat_as_movable, 1226 .maxlen = sizeof(int), 1227 .mode = 0644, 1228 .proc_handler = hugetlb_treat_movable_handler, 1229 }, 1230 { 1231 .procname = "nr_overcommit_hugepages", 1232 .data = NULL, 1233 .maxlen = sizeof(unsigned long), 1234 .mode = 0644, 1235 .proc_handler = hugetlb_overcommit_handler, 1236 .extra1 = (void *)&hugetlb_zero, 1237 .extra2 = (void *)&hugetlb_infinity, 1238 }, 1239 #endif 1240 { 1241 .procname = "lowmem_reserve_ratio", 1242 .data = &sysctl_lowmem_reserve_ratio, 1243 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1244 .mode = 0644, 1245 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1246 }, 1247 { 1248 .procname = "drop_caches", 1249 .data = &sysctl_drop_caches, 1250 .maxlen = sizeof(int), 1251 .mode = 0644, 1252 .proc_handler = drop_caches_sysctl_handler, 1253 .extra1 = &one, 1254 .extra2 = &three, 1255 }, 1256 #ifdef CONFIG_COMPACTION 1257 { 1258 .procname = "compact_memory", 1259 .data = &sysctl_compact_memory, 1260 .maxlen = sizeof(int), 1261 .mode = 0200, 1262 .proc_handler = sysctl_compaction_handler, 1263 }, 1264 { 1265 .procname = "extfrag_threshold", 1266 .data = &sysctl_extfrag_threshold, 1267 .maxlen = sizeof(int), 1268 .mode = 0644, 1269 .proc_handler = sysctl_extfrag_handler, 1270 .extra1 = &min_extfrag_threshold, 1271 .extra2 = &max_extfrag_threshold, 1272 }, 1273 1274 #endif /* CONFIG_COMPACTION */ 1275 { 1276 .procname = "min_free_kbytes", 1277 .data = &min_free_kbytes, 1278 .maxlen = sizeof(min_free_kbytes), 1279 .mode = 0644, 1280 .proc_handler = min_free_kbytes_sysctl_handler, 1281 .extra1 = &zero, 1282 }, 1283 { 1284 .procname = "percpu_pagelist_fraction", 1285 .data = &percpu_pagelist_fraction, 1286 .maxlen = sizeof(percpu_pagelist_fraction), 1287 .mode = 0644, 1288 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1289 .extra1 = &min_percpu_pagelist_fract, 1290 }, 1291 #ifdef CONFIG_MMU 1292 { 1293 .procname = "max_map_count", 1294 .data = &sysctl_max_map_count, 1295 .maxlen = sizeof(sysctl_max_map_count), 1296 .mode = 0644, 1297 .proc_handler = proc_dointvec_minmax, 1298 .extra1 = &zero, 1299 }, 1300 #else 1301 { 1302 .procname = "nr_trim_pages", 1303 .data = &sysctl_nr_trim_pages, 1304 .maxlen = sizeof(sysctl_nr_trim_pages), 1305 .mode = 0644, 1306 .proc_handler = proc_dointvec_minmax, 1307 .extra1 = &zero, 1308 }, 1309 #endif 1310 { 1311 .procname = "laptop_mode", 1312 .data = &laptop_mode, 1313 .maxlen = sizeof(laptop_mode), 1314 .mode = 0644, 1315 .proc_handler = proc_dointvec_jiffies, 1316 }, 1317 { 1318 .procname = "block_dump", 1319 .data = &block_dump, 1320 .maxlen = sizeof(block_dump), 1321 .mode = 0644, 1322 .proc_handler = proc_dointvec, 1323 .extra1 = &zero, 1324 }, 1325 { 1326 .procname = "vfs_cache_pressure", 1327 .data = &sysctl_vfs_cache_pressure, 1328 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1329 .mode = 0644, 1330 .proc_handler = proc_dointvec, 1331 .extra1 = &zero, 1332 }, 1333 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1334 { 1335 .procname = "legacy_va_layout", 1336 .data = &sysctl_legacy_va_layout, 1337 .maxlen = sizeof(sysctl_legacy_va_layout), 1338 .mode = 0644, 1339 .proc_handler = proc_dointvec, 1340 .extra1 = &zero, 1341 }, 1342 #endif 1343 #ifdef CONFIG_NUMA 1344 { 1345 .procname = "zone_reclaim_mode", 1346 .data = &zone_reclaim_mode, 1347 .maxlen = sizeof(zone_reclaim_mode), 1348 .mode = 0644, 1349 .proc_handler = proc_dointvec, 1350 .extra1 = &zero, 1351 }, 1352 { 1353 .procname = "min_unmapped_ratio", 1354 .data = &sysctl_min_unmapped_ratio, 1355 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1356 .mode = 0644, 1357 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1358 .extra1 = &zero, 1359 .extra2 = &one_hundred, 1360 }, 1361 { 1362 .procname = "min_slab_ratio", 1363 .data = &sysctl_min_slab_ratio, 1364 .maxlen = sizeof(sysctl_min_slab_ratio), 1365 .mode = 0644, 1366 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1367 .extra1 = &zero, 1368 .extra2 = &one_hundred, 1369 }, 1370 #endif 1371 #ifdef CONFIG_SMP 1372 { 1373 .procname = "stat_interval", 1374 .data = &sysctl_stat_interval, 1375 .maxlen = sizeof(sysctl_stat_interval), 1376 .mode = 0644, 1377 .proc_handler = proc_dointvec_jiffies, 1378 }, 1379 #endif 1380 #ifdef CONFIG_MMU 1381 { 1382 .procname = "mmap_min_addr", 1383 .data = &dac_mmap_min_addr, 1384 .maxlen = sizeof(unsigned long), 1385 .mode = 0644, 1386 .proc_handler = mmap_min_addr_handler, 1387 }, 1388 #endif 1389 #ifdef CONFIG_NUMA 1390 { 1391 .procname = "numa_zonelist_order", 1392 .data = &numa_zonelist_order, 1393 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1394 .mode = 0644, 1395 .proc_handler = numa_zonelist_order_handler, 1396 }, 1397 #endif 1398 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1399 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1400 { 1401 .procname = "vdso_enabled", 1402 .data = &vdso_enabled, 1403 .maxlen = sizeof(vdso_enabled), 1404 .mode = 0644, 1405 .proc_handler = proc_dointvec, 1406 .extra1 = &zero, 1407 }, 1408 #endif 1409 #ifdef CONFIG_HIGHMEM 1410 { 1411 .procname = "highmem_is_dirtyable", 1412 .data = &vm_highmem_is_dirtyable, 1413 .maxlen = sizeof(vm_highmem_is_dirtyable), 1414 .mode = 0644, 1415 .proc_handler = proc_dointvec_minmax, 1416 .extra1 = &zero, 1417 .extra2 = &one, 1418 }, 1419 #endif 1420 { 1421 .procname = "scan_unevictable_pages", 1422 .data = &scan_unevictable_pages, 1423 .maxlen = sizeof(scan_unevictable_pages), 1424 .mode = 0644, 1425 .proc_handler = scan_unevictable_handler, 1426 }, 1427 #ifdef CONFIG_MEMORY_FAILURE 1428 { 1429 .procname = "memory_failure_early_kill", 1430 .data = &sysctl_memory_failure_early_kill, 1431 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1432 .mode = 0644, 1433 .proc_handler = proc_dointvec_minmax, 1434 .extra1 = &zero, 1435 .extra2 = &one, 1436 }, 1437 { 1438 .procname = "memory_failure_recovery", 1439 .data = &sysctl_memory_failure_recovery, 1440 .maxlen = sizeof(sysctl_memory_failure_recovery), 1441 .mode = 0644, 1442 .proc_handler = proc_dointvec_minmax, 1443 .extra1 = &zero, 1444 .extra2 = &one, 1445 }, 1446 #endif 1447 { 1448 .procname = "user_reserve_kbytes", 1449 .data = &sysctl_user_reserve_kbytes, 1450 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1451 .mode = 0644, 1452 .proc_handler = proc_doulongvec_minmax, 1453 }, 1454 { 1455 .procname = "admin_reserve_kbytes", 1456 .data = &sysctl_admin_reserve_kbytes, 1457 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1458 .mode = 0644, 1459 .proc_handler = proc_doulongvec_minmax, 1460 }, 1461 { } 1462 }; 1463 1464 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1465 static struct ctl_table binfmt_misc_table[] = { 1466 { } 1467 }; 1468 #endif 1469 1470 static struct ctl_table fs_table[] = { 1471 { 1472 .procname = "inode-nr", 1473 .data = &inodes_stat, 1474 .maxlen = 2*sizeof(int), 1475 .mode = 0444, 1476 .proc_handler = proc_nr_inodes, 1477 }, 1478 { 1479 .procname = "inode-state", 1480 .data = &inodes_stat, 1481 .maxlen = 7*sizeof(int), 1482 .mode = 0444, 1483 .proc_handler = proc_nr_inodes, 1484 }, 1485 { 1486 .procname = "file-nr", 1487 .data = &files_stat, 1488 .maxlen = sizeof(files_stat), 1489 .mode = 0444, 1490 .proc_handler = proc_nr_files, 1491 }, 1492 { 1493 .procname = "file-max", 1494 .data = &files_stat.max_files, 1495 .maxlen = sizeof(files_stat.max_files), 1496 .mode = 0644, 1497 .proc_handler = proc_doulongvec_minmax, 1498 }, 1499 { 1500 .procname = "nr_open", 1501 .data = &sysctl_nr_open, 1502 .maxlen = sizeof(int), 1503 .mode = 0644, 1504 .proc_handler = proc_dointvec_minmax, 1505 .extra1 = &sysctl_nr_open_min, 1506 .extra2 = &sysctl_nr_open_max, 1507 }, 1508 { 1509 .procname = "dentry-state", 1510 .data = &dentry_stat, 1511 .maxlen = 6*sizeof(int), 1512 .mode = 0444, 1513 .proc_handler = proc_nr_dentry, 1514 }, 1515 { 1516 .procname = "overflowuid", 1517 .data = &fs_overflowuid, 1518 .maxlen = sizeof(int), 1519 .mode = 0644, 1520 .proc_handler = proc_dointvec_minmax, 1521 .extra1 = &minolduid, 1522 .extra2 = &maxolduid, 1523 }, 1524 { 1525 .procname = "overflowgid", 1526 .data = &fs_overflowgid, 1527 .maxlen = sizeof(int), 1528 .mode = 0644, 1529 .proc_handler = proc_dointvec_minmax, 1530 .extra1 = &minolduid, 1531 .extra2 = &maxolduid, 1532 }, 1533 #ifdef CONFIG_FILE_LOCKING 1534 { 1535 .procname = "leases-enable", 1536 .data = &leases_enable, 1537 .maxlen = sizeof(int), 1538 .mode = 0644, 1539 .proc_handler = proc_dointvec, 1540 }, 1541 #endif 1542 #ifdef CONFIG_DNOTIFY 1543 { 1544 .procname = "dir-notify-enable", 1545 .data = &dir_notify_enable, 1546 .maxlen = sizeof(int), 1547 .mode = 0644, 1548 .proc_handler = proc_dointvec, 1549 }, 1550 #endif 1551 #ifdef CONFIG_MMU 1552 #ifdef CONFIG_FILE_LOCKING 1553 { 1554 .procname = "lease-break-time", 1555 .data = &lease_break_time, 1556 .maxlen = sizeof(int), 1557 .mode = 0644, 1558 .proc_handler = proc_dointvec, 1559 }, 1560 #endif 1561 #ifdef CONFIG_AIO 1562 { 1563 .procname = "aio-nr", 1564 .data = &aio_nr, 1565 .maxlen = sizeof(aio_nr), 1566 .mode = 0444, 1567 .proc_handler = proc_doulongvec_minmax, 1568 }, 1569 { 1570 .procname = "aio-max-nr", 1571 .data = &aio_max_nr, 1572 .maxlen = sizeof(aio_max_nr), 1573 .mode = 0644, 1574 .proc_handler = proc_doulongvec_minmax, 1575 }, 1576 #endif /* CONFIG_AIO */ 1577 #ifdef CONFIG_INOTIFY_USER 1578 { 1579 .procname = "inotify", 1580 .mode = 0555, 1581 .child = inotify_table, 1582 }, 1583 #endif 1584 #ifdef CONFIG_EPOLL 1585 { 1586 .procname = "epoll", 1587 .mode = 0555, 1588 .child = epoll_table, 1589 }, 1590 #endif 1591 #endif 1592 { 1593 .procname = "protected_symlinks", 1594 .data = &sysctl_protected_symlinks, 1595 .maxlen = sizeof(int), 1596 .mode = 0600, 1597 .proc_handler = proc_dointvec_minmax, 1598 .extra1 = &zero, 1599 .extra2 = &one, 1600 }, 1601 { 1602 .procname = "protected_hardlinks", 1603 .data = &sysctl_protected_hardlinks, 1604 .maxlen = sizeof(int), 1605 .mode = 0600, 1606 .proc_handler = proc_dointvec_minmax, 1607 .extra1 = &zero, 1608 .extra2 = &one, 1609 }, 1610 { 1611 .procname = "suid_dumpable", 1612 .data = &suid_dumpable, 1613 .maxlen = sizeof(int), 1614 .mode = 0644, 1615 .proc_handler = proc_dointvec_minmax_coredump, 1616 .extra1 = &zero, 1617 .extra2 = &two, 1618 }, 1619 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1620 { 1621 .procname = "binfmt_misc", 1622 .mode = 0555, 1623 .child = binfmt_misc_table, 1624 }, 1625 #endif 1626 { 1627 .procname = "pipe-max-size", 1628 .data = &pipe_max_size, 1629 .maxlen = sizeof(int), 1630 .mode = 0644, 1631 .proc_handler = &pipe_proc_fn, 1632 .extra1 = &pipe_min_size, 1633 }, 1634 { } 1635 }; 1636 1637 static struct ctl_table debug_table[] = { 1638 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1639 { 1640 .procname = "exception-trace", 1641 .data = &show_unhandled_signals, 1642 .maxlen = sizeof(int), 1643 .mode = 0644, 1644 .proc_handler = proc_dointvec 1645 }, 1646 #endif 1647 #if defined(CONFIG_OPTPROBES) 1648 { 1649 .procname = "kprobes-optimization", 1650 .data = &sysctl_kprobes_optimization, 1651 .maxlen = sizeof(int), 1652 .mode = 0644, 1653 .proc_handler = proc_kprobes_optimization_handler, 1654 .extra1 = &zero, 1655 .extra2 = &one, 1656 }, 1657 #endif 1658 { } 1659 }; 1660 1661 static struct ctl_table dev_table[] = { 1662 { } 1663 }; 1664 1665 int __init sysctl_init(void) 1666 { 1667 struct ctl_table_header *hdr; 1668 1669 hdr = register_sysctl_table(sysctl_base_table); 1670 kmemleak_not_leak(hdr); 1671 return 0; 1672 } 1673 1674 #endif /* CONFIG_SYSCTL */ 1675 1676 /* 1677 * /proc/sys support 1678 */ 1679 1680 #ifdef CONFIG_PROC_SYSCTL 1681 1682 static int _proc_do_string(void* data, int maxlen, int write, 1683 void __user *buffer, 1684 size_t *lenp, loff_t *ppos) 1685 { 1686 size_t len; 1687 char __user *p; 1688 char c; 1689 1690 if (!data || !maxlen || !*lenp) { 1691 *lenp = 0; 1692 return 0; 1693 } 1694 1695 if (write) { 1696 len = 0; 1697 p = buffer; 1698 while (len < *lenp) { 1699 if (get_user(c, p++)) 1700 return -EFAULT; 1701 if (c == 0 || c == '\n') 1702 break; 1703 len++; 1704 } 1705 if (len >= maxlen) 1706 len = maxlen-1; 1707 if(copy_from_user(data, buffer, len)) 1708 return -EFAULT; 1709 ((char *) data)[len] = 0; 1710 *ppos += *lenp; 1711 } else { 1712 len = strlen(data); 1713 if (len > maxlen) 1714 len = maxlen; 1715 1716 if (*ppos > len) { 1717 *lenp = 0; 1718 return 0; 1719 } 1720 1721 data += *ppos; 1722 len -= *ppos; 1723 1724 if (len > *lenp) 1725 len = *lenp; 1726 if (len) 1727 if(copy_to_user(buffer, data, len)) 1728 return -EFAULT; 1729 if (len < *lenp) { 1730 if(put_user('\n', ((char __user *) buffer) + len)) 1731 return -EFAULT; 1732 len++; 1733 } 1734 *lenp = len; 1735 *ppos += len; 1736 } 1737 return 0; 1738 } 1739 1740 /** 1741 * proc_dostring - read a string sysctl 1742 * @table: the sysctl table 1743 * @write: %TRUE if this is a write to the sysctl file 1744 * @buffer: the user buffer 1745 * @lenp: the size of the user buffer 1746 * @ppos: file position 1747 * 1748 * Reads/writes a string from/to the user buffer. If the kernel 1749 * buffer provided is not large enough to hold the string, the 1750 * string is truncated. The copied string is %NULL-terminated. 1751 * If the string is being read by the user process, it is copied 1752 * and a newline '\n' is added. It is truncated if the buffer is 1753 * not large enough. 1754 * 1755 * Returns 0 on success. 1756 */ 1757 int proc_dostring(struct ctl_table *table, int write, 1758 void __user *buffer, size_t *lenp, loff_t *ppos) 1759 { 1760 return _proc_do_string(table->data, table->maxlen, write, 1761 buffer, lenp, ppos); 1762 } 1763 1764 static size_t proc_skip_spaces(char **buf) 1765 { 1766 size_t ret; 1767 char *tmp = skip_spaces(*buf); 1768 ret = tmp - *buf; 1769 *buf = tmp; 1770 return ret; 1771 } 1772 1773 static void proc_skip_char(char **buf, size_t *size, const char v) 1774 { 1775 while (*size) { 1776 if (**buf != v) 1777 break; 1778 (*size)--; 1779 (*buf)++; 1780 } 1781 } 1782 1783 #define TMPBUFLEN 22 1784 /** 1785 * proc_get_long - reads an ASCII formatted integer from a user buffer 1786 * 1787 * @buf: a kernel buffer 1788 * @size: size of the kernel buffer 1789 * @val: this is where the number will be stored 1790 * @neg: set to %TRUE if number is negative 1791 * @perm_tr: a vector which contains the allowed trailers 1792 * @perm_tr_len: size of the perm_tr vector 1793 * @tr: pointer to store the trailer character 1794 * 1795 * In case of success %0 is returned and @buf and @size are updated with 1796 * the amount of bytes read. If @tr is non-NULL and a trailing 1797 * character exists (size is non-zero after returning from this 1798 * function), @tr is updated with the trailing character. 1799 */ 1800 static int proc_get_long(char **buf, size_t *size, 1801 unsigned long *val, bool *neg, 1802 const char *perm_tr, unsigned perm_tr_len, char *tr) 1803 { 1804 int len; 1805 char *p, tmp[TMPBUFLEN]; 1806 1807 if (!*size) 1808 return -EINVAL; 1809 1810 len = *size; 1811 if (len > TMPBUFLEN - 1) 1812 len = TMPBUFLEN - 1; 1813 1814 memcpy(tmp, *buf, len); 1815 1816 tmp[len] = 0; 1817 p = tmp; 1818 if (*p == '-' && *size > 1) { 1819 *neg = true; 1820 p++; 1821 } else 1822 *neg = false; 1823 if (!isdigit(*p)) 1824 return -EINVAL; 1825 1826 *val = simple_strtoul(p, &p, 0); 1827 1828 len = p - tmp; 1829 1830 /* We don't know if the next char is whitespace thus we may accept 1831 * invalid integers (e.g. 1234...a) or two integers instead of one 1832 * (e.g. 123...1). So lets not allow such large numbers. */ 1833 if (len == TMPBUFLEN - 1) 1834 return -EINVAL; 1835 1836 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1837 return -EINVAL; 1838 1839 if (tr && (len < *size)) 1840 *tr = *p; 1841 1842 *buf += len; 1843 *size -= len; 1844 1845 return 0; 1846 } 1847 1848 /** 1849 * proc_put_long - converts an integer to a decimal ASCII formatted string 1850 * 1851 * @buf: the user buffer 1852 * @size: the size of the user buffer 1853 * @val: the integer to be converted 1854 * @neg: sign of the number, %TRUE for negative 1855 * 1856 * In case of success %0 is returned and @buf and @size are updated with 1857 * the amount of bytes written. 1858 */ 1859 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1860 bool neg) 1861 { 1862 int len; 1863 char tmp[TMPBUFLEN], *p = tmp; 1864 1865 sprintf(p, "%s%lu", neg ? "-" : "", val); 1866 len = strlen(tmp); 1867 if (len > *size) 1868 len = *size; 1869 if (copy_to_user(*buf, tmp, len)) 1870 return -EFAULT; 1871 *size -= len; 1872 *buf += len; 1873 return 0; 1874 } 1875 #undef TMPBUFLEN 1876 1877 static int proc_put_char(void __user **buf, size_t *size, char c) 1878 { 1879 if (*size) { 1880 char __user **buffer = (char __user **)buf; 1881 if (put_user(c, *buffer)) 1882 return -EFAULT; 1883 (*size)--, (*buffer)++; 1884 *buf = *buffer; 1885 } 1886 return 0; 1887 } 1888 1889 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1890 int *valp, 1891 int write, void *data) 1892 { 1893 if (write) { 1894 *valp = *negp ? -*lvalp : *lvalp; 1895 } else { 1896 int val = *valp; 1897 if (val < 0) { 1898 *negp = true; 1899 *lvalp = (unsigned long)-val; 1900 } else { 1901 *negp = false; 1902 *lvalp = (unsigned long)val; 1903 } 1904 } 1905 return 0; 1906 } 1907 1908 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1909 1910 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1911 int write, void __user *buffer, 1912 size_t *lenp, loff_t *ppos, 1913 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1914 int write, void *data), 1915 void *data) 1916 { 1917 int *i, vleft, first = 1, err = 0; 1918 unsigned long page = 0; 1919 size_t left; 1920 char *kbuf; 1921 1922 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1923 *lenp = 0; 1924 return 0; 1925 } 1926 1927 i = (int *) tbl_data; 1928 vleft = table->maxlen / sizeof(*i); 1929 left = *lenp; 1930 1931 if (!conv) 1932 conv = do_proc_dointvec_conv; 1933 1934 if (write) { 1935 if (left > PAGE_SIZE - 1) 1936 left = PAGE_SIZE - 1; 1937 page = __get_free_page(GFP_TEMPORARY); 1938 kbuf = (char *) page; 1939 if (!kbuf) 1940 return -ENOMEM; 1941 if (copy_from_user(kbuf, buffer, left)) { 1942 err = -EFAULT; 1943 goto free; 1944 } 1945 kbuf[left] = 0; 1946 } 1947 1948 for (; left && vleft--; i++, first=0) { 1949 unsigned long lval; 1950 bool neg; 1951 1952 if (write) { 1953 left -= proc_skip_spaces(&kbuf); 1954 1955 if (!left) 1956 break; 1957 err = proc_get_long(&kbuf, &left, &lval, &neg, 1958 proc_wspace_sep, 1959 sizeof(proc_wspace_sep), NULL); 1960 if (err) 1961 break; 1962 if (conv(&neg, &lval, i, 1, data)) { 1963 err = -EINVAL; 1964 break; 1965 } 1966 } else { 1967 if (conv(&neg, &lval, i, 0, data)) { 1968 err = -EINVAL; 1969 break; 1970 } 1971 if (!first) 1972 err = proc_put_char(&buffer, &left, '\t'); 1973 if (err) 1974 break; 1975 err = proc_put_long(&buffer, &left, lval, neg); 1976 if (err) 1977 break; 1978 } 1979 } 1980 1981 if (!write && !first && left && !err) 1982 err = proc_put_char(&buffer, &left, '\n'); 1983 if (write && !err && left) 1984 left -= proc_skip_spaces(&kbuf); 1985 free: 1986 if (write) { 1987 free_page(page); 1988 if (first) 1989 return err ? : -EINVAL; 1990 } 1991 *lenp -= left; 1992 *ppos += *lenp; 1993 return err; 1994 } 1995 1996 static int do_proc_dointvec(struct ctl_table *table, int write, 1997 void __user *buffer, size_t *lenp, loff_t *ppos, 1998 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1999 int write, void *data), 2000 void *data) 2001 { 2002 return __do_proc_dointvec(table->data, table, write, 2003 buffer, lenp, ppos, conv, data); 2004 } 2005 2006 /** 2007 * proc_dointvec - read a vector of integers 2008 * @table: the sysctl table 2009 * @write: %TRUE if this is a write to the sysctl file 2010 * @buffer: the user buffer 2011 * @lenp: the size of the user buffer 2012 * @ppos: file position 2013 * 2014 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2015 * values from/to the user buffer, treated as an ASCII string. 2016 * 2017 * Returns 0 on success. 2018 */ 2019 int proc_dointvec(struct ctl_table *table, int write, 2020 void __user *buffer, size_t *lenp, loff_t *ppos) 2021 { 2022 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2023 NULL,NULL); 2024 } 2025 2026 /* 2027 * Taint values can only be increased 2028 * This means we can safely use a temporary. 2029 */ 2030 static int proc_taint(struct ctl_table *table, int write, 2031 void __user *buffer, size_t *lenp, loff_t *ppos) 2032 { 2033 struct ctl_table t; 2034 unsigned long tmptaint = get_taint(); 2035 int err; 2036 2037 if (write && !capable(CAP_SYS_ADMIN)) 2038 return -EPERM; 2039 2040 t = *table; 2041 t.data = &tmptaint; 2042 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2043 if (err < 0) 2044 return err; 2045 2046 if (write) { 2047 /* 2048 * Poor man's atomic or. Not worth adding a primitive 2049 * to everyone's atomic.h for this 2050 */ 2051 int i; 2052 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2053 if ((tmptaint >> i) & 1) 2054 add_taint(i, LOCKDEP_STILL_OK); 2055 } 2056 } 2057 2058 return err; 2059 } 2060 2061 #ifdef CONFIG_PRINTK 2062 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2063 void __user *buffer, size_t *lenp, loff_t *ppos) 2064 { 2065 if (write && !capable(CAP_SYS_ADMIN)) 2066 return -EPERM; 2067 2068 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2069 } 2070 #endif 2071 2072 struct do_proc_dointvec_minmax_conv_param { 2073 int *min; 2074 int *max; 2075 }; 2076 2077 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2078 int *valp, 2079 int write, void *data) 2080 { 2081 struct do_proc_dointvec_minmax_conv_param *param = data; 2082 if (write) { 2083 int val = *negp ? -*lvalp : *lvalp; 2084 if ((param->min && *param->min > val) || 2085 (param->max && *param->max < val)) 2086 return -EINVAL; 2087 *valp = val; 2088 } else { 2089 int val = *valp; 2090 if (val < 0) { 2091 *negp = true; 2092 *lvalp = (unsigned long)-val; 2093 } else { 2094 *negp = false; 2095 *lvalp = (unsigned long)val; 2096 } 2097 } 2098 return 0; 2099 } 2100 2101 /** 2102 * proc_dointvec_minmax - read a vector of integers with min/max values 2103 * @table: the sysctl table 2104 * @write: %TRUE if this is a write to the sysctl file 2105 * @buffer: the user buffer 2106 * @lenp: the size of the user buffer 2107 * @ppos: file position 2108 * 2109 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2110 * values from/to the user buffer, treated as an ASCII string. 2111 * 2112 * This routine will ensure the values are within the range specified by 2113 * table->extra1 (min) and table->extra2 (max). 2114 * 2115 * Returns 0 on success. 2116 */ 2117 int proc_dointvec_minmax(struct ctl_table *table, int write, 2118 void __user *buffer, size_t *lenp, loff_t *ppos) 2119 { 2120 struct do_proc_dointvec_minmax_conv_param param = { 2121 .min = (int *) table->extra1, 2122 .max = (int *) table->extra2, 2123 }; 2124 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2125 do_proc_dointvec_minmax_conv, ¶m); 2126 } 2127 2128 static void validate_coredump_safety(void) 2129 { 2130 #ifdef CONFIG_COREDUMP 2131 if (suid_dumpable == SUID_DUMP_ROOT && 2132 core_pattern[0] != '/' && core_pattern[0] != '|') { 2133 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2134 "suid_dumpable=2. Pipe handler or fully qualified "\ 2135 "core dump path required.\n"); 2136 } 2137 #endif 2138 } 2139 2140 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2141 void __user *buffer, size_t *lenp, loff_t *ppos) 2142 { 2143 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2144 if (!error) 2145 validate_coredump_safety(); 2146 return error; 2147 } 2148 2149 #ifdef CONFIG_COREDUMP 2150 static int proc_dostring_coredump(struct ctl_table *table, int write, 2151 void __user *buffer, size_t *lenp, loff_t *ppos) 2152 { 2153 int error = proc_dostring(table, write, buffer, lenp, ppos); 2154 if (!error) 2155 validate_coredump_safety(); 2156 return error; 2157 } 2158 #endif 2159 2160 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2161 void __user *buffer, 2162 size_t *lenp, loff_t *ppos, 2163 unsigned long convmul, 2164 unsigned long convdiv) 2165 { 2166 unsigned long *i, *min, *max; 2167 int vleft, first = 1, err = 0; 2168 unsigned long page = 0; 2169 size_t left; 2170 char *kbuf; 2171 2172 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2173 *lenp = 0; 2174 return 0; 2175 } 2176 2177 i = (unsigned long *) data; 2178 min = (unsigned long *) table->extra1; 2179 max = (unsigned long *) table->extra2; 2180 vleft = table->maxlen / sizeof(unsigned long); 2181 left = *lenp; 2182 2183 if (write) { 2184 if (left > PAGE_SIZE - 1) 2185 left = PAGE_SIZE - 1; 2186 page = __get_free_page(GFP_TEMPORARY); 2187 kbuf = (char *) page; 2188 if (!kbuf) 2189 return -ENOMEM; 2190 if (copy_from_user(kbuf, buffer, left)) { 2191 err = -EFAULT; 2192 goto free; 2193 } 2194 kbuf[left] = 0; 2195 } 2196 2197 for (; left && vleft--; i++, first = 0) { 2198 unsigned long val; 2199 2200 if (write) { 2201 bool neg; 2202 2203 left -= proc_skip_spaces(&kbuf); 2204 2205 err = proc_get_long(&kbuf, &left, &val, &neg, 2206 proc_wspace_sep, 2207 sizeof(proc_wspace_sep), NULL); 2208 if (err) 2209 break; 2210 if (neg) 2211 continue; 2212 if ((min && val < *min) || (max && val > *max)) 2213 continue; 2214 *i = val; 2215 } else { 2216 val = convdiv * (*i) / convmul; 2217 if (!first) 2218 err = proc_put_char(&buffer, &left, '\t'); 2219 err = proc_put_long(&buffer, &left, val, false); 2220 if (err) 2221 break; 2222 } 2223 } 2224 2225 if (!write && !first && left && !err) 2226 err = proc_put_char(&buffer, &left, '\n'); 2227 if (write && !err) 2228 left -= proc_skip_spaces(&kbuf); 2229 free: 2230 if (write) { 2231 free_page(page); 2232 if (first) 2233 return err ? : -EINVAL; 2234 } 2235 *lenp -= left; 2236 *ppos += *lenp; 2237 return err; 2238 } 2239 2240 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2241 void __user *buffer, 2242 size_t *lenp, loff_t *ppos, 2243 unsigned long convmul, 2244 unsigned long convdiv) 2245 { 2246 return __do_proc_doulongvec_minmax(table->data, table, write, 2247 buffer, lenp, ppos, convmul, convdiv); 2248 } 2249 2250 /** 2251 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2252 * @table: the sysctl table 2253 * @write: %TRUE if this is a write to the sysctl file 2254 * @buffer: the user buffer 2255 * @lenp: the size of the user buffer 2256 * @ppos: file position 2257 * 2258 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2259 * values from/to the user buffer, treated as an ASCII string. 2260 * 2261 * This routine will ensure the values are within the range specified by 2262 * table->extra1 (min) and table->extra2 (max). 2263 * 2264 * Returns 0 on success. 2265 */ 2266 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2267 void __user *buffer, size_t *lenp, loff_t *ppos) 2268 { 2269 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2270 } 2271 2272 /** 2273 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2274 * @table: the sysctl table 2275 * @write: %TRUE if this is a write to the sysctl file 2276 * @buffer: the user buffer 2277 * @lenp: the size of the user buffer 2278 * @ppos: file position 2279 * 2280 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2281 * values from/to the user buffer, treated as an ASCII string. The values 2282 * are treated as milliseconds, and converted to jiffies when they are stored. 2283 * 2284 * This routine will ensure the values are within the range specified by 2285 * table->extra1 (min) and table->extra2 (max). 2286 * 2287 * Returns 0 on success. 2288 */ 2289 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2290 void __user *buffer, 2291 size_t *lenp, loff_t *ppos) 2292 { 2293 return do_proc_doulongvec_minmax(table, write, buffer, 2294 lenp, ppos, HZ, 1000l); 2295 } 2296 2297 2298 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2299 int *valp, 2300 int write, void *data) 2301 { 2302 if (write) { 2303 if (*lvalp > LONG_MAX / HZ) 2304 return 1; 2305 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2306 } else { 2307 int val = *valp; 2308 unsigned long lval; 2309 if (val < 0) { 2310 *negp = true; 2311 lval = (unsigned long)-val; 2312 } else { 2313 *negp = false; 2314 lval = (unsigned long)val; 2315 } 2316 *lvalp = lval / HZ; 2317 } 2318 return 0; 2319 } 2320 2321 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2322 int *valp, 2323 int write, void *data) 2324 { 2325 if (write) { 2326 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2327 return 1; 2328 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2329 } else { 2330 int val = *valp; 2331 unsigned long lval; 2332 if (val < 0) { 2333 *negp = true; 2334 lval = (unsigned long)-val; 2335 } else { 2336 *negp = false; 2337 lval = (unsigned long)val; 2338 } 2339 *lvalp = jiffies_to_clock_t(lval); 2340 } 2341 return 0; 2342 } 2343 2344 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2345 int *valp, 2346 int write, void *data) 2347 { 2348 if (write) { 2349 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2350 2351 if (jif > INT_MAX) 2352 return 1; 2353 *valp = (int)jif; 2354 } else { 2355 int val = *valp; 2356 unsigned long lval; 2357 if (val < 0) { 2358 *negp = true; 2359 lval = (unsigned long)-val; 2360 } else { 2361 *negp = false; 2362 lval = (unsigned long)val; 2363 } 2364 *lvalp = jiffies_to_msecs(lval); 2365 } 2366 return 0; 2367 } 2368 2369 /** 2370 * proc_dointvec_jiffies - read a vector of integers as seconds 2371 * @table: the sysctl table 2372 * @write: %TRUE if this is a write to the sysctl file 2373 * @buffer: the user buffer 2374 * @lenp: the size of the user buffer 2375 * @ppos: file position 2376 * 2377 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2378 * values from/to the user buffer, treated as an ASCII string. 2379 * The values read are assumed to be in seconds, and are converted into 2380 * jiffies. 2381 * 2382 * Returns 0 on success. 2383 */ 2384 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2385 void __user *buffer, size_t *lenp, loff_t *ppos) 2386 { 2387 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2388 do_proc_dointvec_jiffies_conv,NULL); 2389 } 2390 2391 /** 2392 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2393 * @table: the sysctl table 2394 * @write: %TRUE if this is a write to the sysctl file 2395 * @buffer: the user buffer 2396 * @lenp: the size of the user buffer 2397 * @ppos: pointer to the file position 2398 * 2399 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2400 * values from/to the user buffer, treated as an ASCII string. 2401 * The values read are assumed to be in 1/USER_HZ seconds, and 2402 * are converted into jiffies. 2403 * 2404 * Returns 0 on success. 2405 */ 2406 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2407 void __user *buffer, size_t *lenp, loff_t *ppos) 2408 { 2409 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2410 do_proc_dointvec_userhz_jiffies_conv,NULL); 2411 } 2412 2413 /** 2414 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2415 * @table: the sysctl table 2416 * @write: %TRUE if this is a write to the sysctl file 2417 * @buffer: the user buffer 2418 * @lenp: the size of the user buffer 2419 * @ppos: file position 2420 * @ppos: the current position in the file 2421 * 2422 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2423 * values from/to the user buffer, treated as an ASCII string. 2424 * The values read are assumed to be in 1/1000 seconds, and 2425 * are converted into jiffies. 2426 * 2427 * Returns 0 on success. 2428 */ 2429 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2430 void __user *buffer, size_t *lenp, loff_t *ppos) 2431 { 2432 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2433 do_proc_dointvec_ms_jiffies_conv, NULL); 2434 } 2435 2436 static int proc_do_cad_pid(struct ctl_table *table, int write, 2437 void __user *buffer, size_t *lenp, loff_t *ppos) 2438 { 2439 struct pid *new_pid; 2440 pid_t tmp; 2441 int r; 2442 2443 tmp = pid_vnr(cad_pid); 2444 2445 r = __do_proc_dointvec(&tmp, table, write, buffer, 2446 lenp, ppos, NULL, NULL); 2447 if (r || !write) 2448 return r; 2449 2450 new_pid = find_get_pid(tmp); 2451 if (!new_pid) 2452 return -ESRCH; 2453 2454 put_pid(xchg(&cad_pid, new_pid)); 2455 return 0; 2456 } 2457 2458 /** 2459 * proc_do_large_bitmap - read/write from/to a large bitmap 2460 * @table: the sysctl table 2461 * @write: %TRUE if this is a write to the sysctl file 2462 * @buffer: the user buffer 2463 * @lenp: the size of the user buffer 2464 * @ppos: file position 2465 * 2466 * The bitmap is stored at table->data and the bitmap length (in bits) 2467 * in table->maxlen. 2468 * 2469 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2470 * large bitmaps may be represented in a compact manner. Writing into 2471 * the file will clear the bitmap then update it with the given input. 2472 * 2473 * Returns 0 on success. 2474 */ 2475 int proc_do_large_bitmap(struct ctl_table *table, int write, 2476 void __user *buffer, size_t *lenp, loff_t *ppos) 2477 { 2478 int err = 0; 2479 bool first = 1; 2480 size_t left = *lenp; 2481 unsigned long bitmap_len = table->maxlen; 2482 unsigned long *bitmap = (unsigned long *) table->data; 2483 unsigned long *tmp_bitmap = NULL; 2484 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2485 2486 if (!bitmap_len || !left || (*ppos && !write)) { 2487 *lenp = 0; 2488 return 0; 2489 } 2490 2491 if (write) { 2492 unsigned long page = 0; 2493 char *kbuf; 2494 2495 if (left > PAGE_SIZE - 1) 2496 left = PAGE_SIZE - 1; 2497 2498 page = __get_free_page(GFP_TEMPORARY); 2499 kbuf = (char *) page; 2500 if (!kbuf) 2501 return -ENOMEM; 2502 if (copy_from_user(kbuf, buffer, left)) { 2503 free_page(page); 2504 return -EFAULT; 2505 } 2506 kbuf[left] = 0; 2507 2508 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2509 GFP_KERNEL); 2510 if (!tmp_bitmap) { 2511 free_page(page); 2512 return -ENOMEM; 2513 } 2514 proc_skip_char(&kbuf, &left, '\n'); 2515 while (!err && left) { 2516 unsigned long val_a, val_b; 2517 bool neg; 2518 2519 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2520 sizeof(tr_a), &c); 2521 if (err) 2522 break; 2523 if (val_a >= bitmap_len || neg) { 2524 err = -EINVAL; 2525 break; 2526 } 2527 2528 val_b = val_a; 2529 if (left) { 2530 kbuf++; 2531 left--; 2532 } 2533 2534 if (c == '-') { 2535 err = proc_get_long(&kbuf, &left, &val_b, 2536 &neg, tr_b, sizeof(tr_b), 2537 &c); 2538 if (err) 2539 break; 2540 if (val_b >= bitmap_len || neg || 2541 val_a > val_b) { 2542 err = -EINVAL; 2543 break; 2544 } 2545 if (left) { 2546 kbuf++; 2547 left--; 2548 } 2549 } 2550 2551 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2552 first = 0; 2553 proc_skip_char(&kbuf, &left, '\n'); 2554 } 2555 free_page(page); 2556 } else { 2557 unsigned long bit_a, bit_b = 0; 2558 2559 while (left) { 2560 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2561 if (bit_a >= bitmap_len) 2562 break; 2563 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2564 bit_a + 1) - 1; 2565 2566 if (!first) { 2567 err = proc_put_char(&buffer, &left, ','); 2568 if (err) 2569 break; 2570 } 2571 err = proc_put_long(&buffer, &left, bit_a, false); 2572 if (err) 2573 break; 2574 if (bit_a != bit_b) { 2575 err = proc_put_char(&buffer, &left, '-'); 2576 if (err) 2577 break; 2578 err = proc_put_long(&buffer, &left, bit_b, false); 2579 if (err) 2580 break; 2581 } 2582 2583 first = 0; bit_b++; 2584 } 2585 if (!err) 2586 err = proc_put_char(&buffer, &left, '\n'); 2587 } 2588 2589 if (!err) { 2590 if (write) { 2591 if (*ppos) 2592 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2593 else 2594 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2595 } 2596 kfree(tmp_bitmap); 2597 *lenp -= left; 2598 *ppos += *lenp; 2599 return 0; 2600 } else { 2601 kfree(tmp_bitmap); 2602 return err; 2603 } 2604 } 2605 2606 #else /* CONFIG_PROC_SYSCTL */ 2607 2608 int proc_dostring(struct ctl_table *table, int write, 2609 void __user *buffer, size_t *lenp, loff_t *ppos) 2610 { 2611 return -ENOSYS; 2612 } 2613 2614 int proc_dointvec(struct ctl_table *table, int write, 2615 void __user *buffer, size_t *lenp, loff_t *ppos) 2616 { 2617 return -ENOSYS; 2618 } 2619 2620 int proc_dointvec_minmax(struct ctl_table *table, int write, 2621 void __user *buffer, size_t *lenp, loff_t *ppos) 2622 { 2623 return -ENOSYS; 2624 } 2625 2626 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2627 void __user *buffer, size_t *lenp, loff_t *ppos) 2628 { 2629 return -ENOSYS; 2630 } 2631 2632 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2633 void __user *buffer, size_t *lenp, loff_t *ppos) 2634 { 2635 return -ENOSYS; 2636 } 2637 2638 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2639 void __user *buffer, size_t *lenp, loff_t *ppos) 2640 { 2641 return -ENOSYS; 2642 } 2643 2644 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2645 void __user *buffer, size_t *lenp, loff_t *ppos) 2646 { 2647 return -ENOSYS; 2648 } 2649 2650 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2651 void __user *buffer, 2652 size_t *lenp, loff_t *ppos) 2653 { 2654 return -ENOSYS; 2655 } 2656 2657 2658 #endif /* CONFIG_PROC_SYSCTL */ 2659 2660 /* 2661 * No sense putting this after each symbol definition, twice, 2662 * exception granted :-) 2663 */ 2664 EXPORT_SYMBOL(proc_dointvec); 2665 EXPORT_SYMBOL(proc_dointvec_jiffies); 2666 EXPORT_SYMBOL(proc_dointvec_minmax); 2667 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2668 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2669 EXPORT_SYMBOL(proc_dostring); 2670 EXPORT_SYMBOL(proc_doulongvec_minmax); 2671 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2672