1 /* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21 #include <linux/module.h> 22 #include <linux/mm.h> 23 #include <linux/swap.h> 24 #include <linux/slab.h> 25 #include <linux/sysctl.h> 26 #include <linux/bitmap.h> 27 #include <linux/signal.h> 28 #include <linux/printk.h> 29 #include <linux/proc_fs.h> 30 #include <linux/security.h> 31 #include <linux/ctype.h> 32 #include <linux/kmemcheck.h> 33 #include <linux/kmemleak.h> 34 #include <linux/fs.h> 35 #include <linux/init.h> 36 #include <linux/kernel.h> 37 #include <linux/kobject.h> 38 #include <linux/net.h> 39 #include <linux/sysrq.h> 40 #include <linux/highuid.h> 41 #include <linux/writeback.h> 42 #include <linux/ratelimit.h> 43 #include <linux/compaction.h> 44 #include <linux/hugetlb.h> 45 #include <linux/initrd.h> 46 #include <linux/key.h> 47 #include <linux/times.h> 48 #include <linux/limits.h> 49 #include <linux/dcache.h> 50 #include <linux/dnotify.h> 51 #include <linux/syscalls.h> 52 #include <linux/vmstat.h> 53 #include <linux/nfs_fs.h> 54 #include <linux/acpi.h> 55 #include <linux/reboot.h> 56 #include <linux/ftrace.h> 57 #include <linux/perf_event.h> 58 #include <linux/kprobes.h> 59 #include <linux/pipe_fs_i.h> 60 #include <linux/oom.h> 61 #include <linux/kmod.h> 62 #include <linux/capability.h> 63 #include <linux/binfmts.h> 64 #include <linux/sched/sysctl.h> 65 #include <linux/kexec.h> 66 67 #include <asm/uaccess.h> 68 #include <asm/processor.h> 69 70 #ifdef CONFIG_X86 71 #include <asm/nmi.h> 72 #include <asm/stacktrace.h> 73 #include <asm/io.h> 74 #endif 75 #ifdef CONFIG_SPARC 76 #include <asm/setup.h> 77 #endif 78 #ifdef CONFIG_BSD_PROCESS_ACCT 79 #include <linux/acct.h> 80 #endif 81 #ifdef CONFIG_RT_MUTEXES 82 #include <linux/rtmutex.h> 83 #endif 84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 85 #include <linux/lockdep.h> 86 #endif 87 #ifdef CONFIG_CHR_DEV_SG 88 #include <scsi/sg.h> 89 #endif 90 91 #ifdef CONFIG_LOCKUP_DETECTOR 92 #include <linux/nmi.h> 93 #endif 94 95 96 #if defined(CONFIG_SYSCTL) 97 98 /* External variables not in a header file. */ 99 extern int max_threads; 100 extern int suid_dumpable; 101 #ifdef CONFIG_COREDUMP 102 extern int core_uses_pid; 103 extern char core_pattern[]; 104 extern unsigned int core_pipe_limit; 105 #endif 106 extern int pid_max; 107 extern int pid_max_min, pid_max_max; 108 extern int percpu_pagelist_fraction; 109 extern int compat_log; 110 extern int latencytop_enabled; 111 extern int sysctl_nr_open_min, sysctl_nr_open_max; 112 #ifndef CONFIG_MMU 113 extern int sysctl_nr_trim_pages; 114 #endif 115 116 /* Constants used for minimum and maximum */ 117 #ifdef CONFIG_LOCKUP_DETECTOR 118 static int sixty = 60; 119 #endif 120 121 static int __maybe_unused neg_one = -1; 122 123 static int zero; 124 static int __maybe_unused one = 1; 125 static int __maybe_unused two = 2; 126 static int __maybe_unused four = 4; 127 static unsigned long one_ul = 1; 128 static int one_hundred = 100; 129 #ifdef CONFIG_PRINTK 130 static int ten_thousand = 10000; 131 #endif 132 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 135 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 137 static int maxolduid = 65535; 138 static int minolduid; 139 140 static int ngroups_max = NGROUPS_MAX; 141 static const int cap_last_cap = CAP_LAST_CAP; 142 143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 144 #ifdef CONFIG_DETECT_HUNG_TASK 145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 146 #endif 147 148 #ifdef CONFIG_INOTIFY_USER 149 #include <linux/inotify.h> 150 #endif 151 #ifdef CONFIG_SPARC 152 #endif 153 154 #ifdef __hppa__ 155 extern int pwrsw_enabled; 156 #endif 157 158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 159 extern int unaligned_enabled; 160 #endif 161 162 #ifdef CONFIG_IA64 163 extern int unaligned_dump_stack; 164 #endif 165 166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 167 extern int no_unaligned_warning; 168 #endif 169 170 #ifdef CONFIG_PROC_SYSCTL 171 172 #define SYSCTL_WRITES_LEGACY -1 173 #define SYSCTL_WRITES_WARN 0 174 #define SYSCTL_WRITES_STRICT 1 175 176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN; 177 178 static int proc_do_cad_pid(struct ctl_table *table, int write, 179 void __user *buffer, size_t *lenp, loff_t *ppos); 180 static int proc_taint(struct ctl_table *table, int write, 181 void __user *buffer, size_t *lenp, loff_t *ppos); 182 #endif 183 184 #ifdef CONFIG_PRINTK 185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 186 void __user *buffer, size_t *lenp, loff_t *ppos); 187 #endif 188 189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 190 void __user *buffer, size_t *lenp, loff_t *ppos); 191 #ifdef CONFIG_COREDUMP 192 static int proc_dostring_coredump(struct ctl_table *table, int write, 193 void __user *buffer, size_t *lenp, loff_t *ppos); 194 #endif 195 196 #ifdef CONFIG_MAGIC_SYSRQ 197 /* Note: sysrq code uses it's own private copy */ 198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 199 200 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 201 void __user *buffer, size_t *lenp, 202 loff_t *ppos) 203 { 204 int error; 205 206 error = proc_dointvec(table, write, buffer, lenp, ppos); 207 if (error) 208 return error; 209 210 if (write) 211 sysrq_toggle_support(__sysrq_enabled); 212 213 return 0; 214 } 215 216 #endif 217 218 static struct ctl_table kern_table[]; 219 static struct ctl_table vm_table[]; 220 static struct ctl_table fs_table[]; 221 static struct ctl_table debug_table[]; 222 static struct ctl_table dev_table[]; 223 extern struct ctl_table random_table[]; 224 #ifdef CONFIG_EPOLL 225 extern struct ctl_table epoll_table[]; 226 #endif 227 228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 229 int sysctl_legacy_va_layout; 230 #endif 231 232 /* The default sysctl tables: */ 233 234 static struct ctl_table sysctl_base_table[] = { 235 { 236 .procname = "kernel", 237 .mode = 0555, 238 .child = kern_table, 239 }, 240 { 241 .procname = "vm", 242 .mode = 0555, 243 .child = vm_table, 244 }, 245 { 246 .procname = "fs", 247 .mode = 0555, 248 .child = fs_table, 249 }, 250 { 251 .procname = "debug", 252 .mode = 0555, 253 .child = debug_table, 254 }, 255 { 256 .procname = "dev", 257 .mode = 0555, 258 .child = dev_table, 259 }, 260 { } 261 }; 262 263 #ifdef CONFIG_SCHED_DEBUG 264 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 265 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 266 static int min_wakeup_granularity_ns; /* 0 usecs */ 267 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 268 #ifdef CONFIG_SMP 269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 271 #endif /* CONFIG_SMP */ 272 #endif /* CONFIG_SCHED_DEBUG */ 273 274 #ifdef CONFIG_COMPACTION 275 static int min_extfrag_threshold; 276 static int max_extfrag_threshold = 1000; 277 #endif 278 279 static struct ctl_table kern_table[] = { 280 { 281 .procname = "sched_child_runs_first", 282 .data = &sysctl_sched_child_runs_first, 283 .maxlen = sizeof(unsigned int), 284 .mode = 0644, 285 .proc_handler = proc_dointvec, 286 }, 287 #ifdef CONFIG_SCHED_DEBUG 288 { 289 .procname = "sched_min_granularity_ns", 290 .data = &sysctl_sched_min_granularity, 291 .maxlen = sizeof(unsigned int), 292 .mode = 0644, 293 .proc_handler = sched_proc_update_handler, 294 .extra1 = &min_sched_granularity_ns, 295 .extra2 = &max_sched_granularity_ns, 296 }, 297 { 298 .procname = "sched_latency_ns", 299 .data = &sysctl_sched_latency, 300 .maxlen = sizeof(unsigned int), 301 .mode = 0644, 302 .proc_handler = sched_proc_update_handler, 303 .extra1 = &min_sched_granularity_ns, 304 .extra2 = &max_sched_granularity_ns, 305 }, 306 { 307 .procname = "sched_wakeup_granularity_ns", 308 .data = &sysctl_sched_wakeup_granularity, 309 .maxlen = sizeof(unsigned int), 310 .mode = 0644, 311 .proc_handler = sched_proc_update_handler, 312 .extra1 = &min_wakeup_granularity_ns, 313 .extra2 = &max_wakeup_granularity_ns, 314 }, 315 #ifdef CONFIG_SMP 316 { 317 .procname = "sched_tunable_scaling", 318 .data = &sysctl_sched_tunable_scaling, 319 .maxlen = sizeof(enum sched_tunable_scaling), 320 .mode = 0644, 321 .proc_handler = sched_proc_update_handler, 322 .extra1 = &min_sched_tunable_scaling, 323 .extra2 = &max_sched_tunable_scaling, 324 }, 325 { 326 .procname = "sched_migration_cost_ns", 327 .data = &sysctl_sched_migration_cost, 328 .maxlen = sizeof(unsigned int), 329 .mode = 0644, 330 .proc_handler = proc_dointvec, 331 }, 332 { 333 .procname = "sched_nr_migrate", 334 .data = &sysctl_sched_nr_migrate, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = proc_dointvec, 338 }, 339 { 340 .procname = "sched_time_avg_ms", 341 .data = &sysctl_sched_time_avg, 342 .maxlen = sizeof(unsigned int), 343 .mode = 0644, 344 .proc_handler = proc_dointvec, 345 }, 346 { 347 .procname = "sched_shares_window_ns", 348 .data = &sysctl_sched_shares_window, 349 .maxlen = sizeof(unsigned int), 350 .mode = 0644, 351 .proc_handler = proc_dointvec, 352 }, 353 { 354 .procname = "timer_migration", 355 .data = &sysctl_timer_migration, 356 .maxlen = sizeof(unsigned int), 357 .mode = 0644, 358 .proc_handler = proc_dointvec_minmax, 359 .extra1 = &zero, 360 .extra2 = &one, 361 }, 362 #endif /* CONFIG_SMP */ 363 #ifdef CONFIG_NUMA_BALANCING 364 { 365 .procname = "numa_balancing_scan_delay_ms", 366 .data = &sysctl_numa_balancing_scan_delay, 367 .maxlen = sizeof(unsigned int), 368 .mode = 0644, 369 .proc_handler = proc_dointvec, 370 }, 371 { 372 .procname = "numa_balancing_scan_period_min_ms", 373 .data = &sysctl_numa_balancing_scan_period_min, 374 .maxlen = sizeof(unsigned int), 375 .mode = 0644, 376 .proc_handler = proc_dointvec, 377 }, 378 { 379 .procname = "numa_balancing_scan_period_max_ms", 380 .data = &sysctl_numa_balancing_scan_period_max, 381 .maxlen = sizeof(unsigned int), 382 .mode = 0644, 383 .proc_handler = proc_dointvec, 384 }, 385 { 386 .procname = "numa_balancing_scan_size_mb", 387 .data = &sysctl_numa_balancing_scan_size, 388 .maxlen = sizeof(unsigned int), 389 .mode = 0644, 390 .proc_handler = proc_dointvec, 391 }, 392 { 393 .procname = "numa_balancing", 394 .data = NULL, /* filled in by handler */ 395 .maxlen = sizeof(unsigned int), 396 .mode = 0644, 397 .proc_handler = sysctl_numa_balancing, 398 .extra1 = &zero, 399 .extra2 = &one, 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 { 501 .procname = "sysctl_writes_strict", 502 .data = &sysctl_writes_strict, 503 .maxlen = sizeof(int), 504 .mode = 0644, 505 .proc_handler = proc_dointvec_minmax, 506 .extra1 = &neg_one, 507 .extra2 = &one, 508 }, 509 #endif 510 #ifdef CONFIG_LATENCYTOP 511 { 512 .procname = "latencytop", 513 .data = &latencytop_enabled, 514 .maxlen = sizeof(int), 515 .mode = 0644, 516 .proc_handler = proc_dointvec, 517 }, 518 #endif 519 #ifdef CONFIG_BLK_DEV_INITRD 520 { 521 .procname = "real-root-dev", 522 .data = &real_root_dev, 523 .maxlen = sizeof(int), 524 .mode = 0644, 525 .proc_handler = proc_dointvec, 526 }, 527 #endif 528 { 529 .procname = "print-fatal-signals", 530 .data = &print_fatal_signals, 531 .maxlen = sizeof(int), 532 .mode = 0644, 533 .proc_handler = proc_dointvec, 534 }, 535 #ifdef CONFIG_SPARC 536 { 537 .procname = "reboot-cmd", 538 .data = reboot_command, 539 .maxlen = 256, 540 .mode = 0644, 541 .proc_handler = proc_dostring, 542 }, 543 { 544 .procname = "stop-a", 545 .data = &stop_a_enabled, 546 .maxlen = sizeof (int), 547 .mode = 0644, 548 .proc_handler = proc_dointvec, 549 }, 550 { 551 .procname = "scons-poweroff", 552 .data = &scons_pwroff, 553 .maxlen = sizeof (int), 554 .mode = 0644, 555 .proc_handler = proc_dointvec, 556 }, 557 #endif 558 #ifdef CONFIG_SPARC64 559 { 560 .procname = "tsb-ratio", 561 .data = &sysctl_tsb_ratio, 562 .maxlen = sizeof (int), 563 .mode = 0644, 564 .proc_handler = proc_dointvec, 565 }, 566 #endif 567 #ifdef __hppa__ 568 { 569 .procname = "soft-power", 570 .data = &pwrsw_enabled, 571 .maxlen = sizeof (int), 572 .mode = 0644, 573 .proc_handler = proc_dointvec, 574 }, 575 #endif 576 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 577 { 578 .procname = "unaligned-trap", 579 .data = &unaligned_enabled, 580 .maxlen = sizeof (int), 581 .mode = 0644, 582 .proc_handler = proc_dointvec, 583 }, 584 #endif 585 { 586 .procname = "ctrl-alt-del", 587 .data = &C_A_D, 588 .maxlen = sizeof(int), 589 .mode = 0644, 590 .proc_handler = proc_dointvec, 591 }, 592 #ifdef CONFIG_FUNCTION_TRACER 593 { 594 .procname = "ftrace_enabled", 595 .data = &ftrace_enabled, 596 .maxlen = sizeof(int), 597 .mode = 0644, 598 .proc_handler = ftrace_enable_sysctl, 599 }, 600 #endif 601 #ifdef CONFIG_STACK_TRACER 602 { 603 .procname = "stack_tracer_enabled", 604 .data = &stack_tracer_enabled, 605 .maxlen = sizeof(int), 606 .mode = 0644, 607 .proc_handler = stack_trace_sysctl, 608 }, 609 #endif 610 #ifdef CONFIG_TRACING 611 { 612 .procname = "ftrace_dump_on_oops", 613 .data = &ftrace_dump_on_oops, 614 .maxlen = sizeof(int), 615 .mode = 0644, 616 .proc_handler = proc_dointvec, 617 }, 618 { 619 .procname = "traceoff_on_warning", 620 .data = &__disable_trace_on_warning, 621 .maxlen = sizeof(__disable_trace_on_warning), 622 .mode = 0644, 623 .proc_handler = proc_dointvec, 624 }, 625 #endif 626 #ifdef CONFIG_KEXEC 627 { 628 .procname = "kexec_load_disabled", 629 .data = &kexec_load_disabled, 630 .maxlen = sizeof(int), 631 .mode = 0644, 632 /* only handle a transition from default "0" to "1" */ 633 .proc_handler = proc_dointvec_minmax, 634 .extra1 = &one, 635 .extra2 = &one, 636 }, 637 #endif 638 #ifdef CONFIG_MODULES 639 { 640 .procname = "modprobe", 641 .data = &modprobe_path, 642 .maxlen = KMOD_PATH_LEN, 643 .mode = 0644, 644 .proc_handler = proc_dostring, 645 }, 646 { 647 .procname = "modules_disabled", 648 .data = &modules_disabled, 649 .maxlen = sizeof(int), 650 .mode = 0644, 651 /* only handle a transition from default "0" to "1" */ 652 .proc_handler = proc_dointvec_minmax, 653 .extra1 = &one, 654 .extra2 = &one, 655 }, 656 #endif 657 #ifdef CONFIG_UEVENT_HELPER 658 { 659 .procname = "hotplug", 660 .data = &uevent_helper, 661 .maxlen = UEVENT_HELPER_PATH_LEN, 662 .mode = 0644, 663 .proc_handler = proc_dostring, 664 }, 665 #endif 666 #ifdef CONFIG_CHR_DEV_SG 667 { 668 .procname = "sg-big-buff", 669 .data = &sg_big_buff, 670 .maxlen = sizeof (int), 671 .mode = 0444, 672 .proc_handler = proc_dointvec, 673 }, 674 #endif 675 #ifdef CONFIG_BSD_PROCESS_ACCT 676 { 677 .procname = "acct", 678 .data = &acct_parm, 679 .maxlen = 3*sizeof(int), 680 .mode = 0644, 681 .proc_handler = proc_dointvec, 682 }, 683 #endif 684 #ifdef CONFIG_MAGIC_SYSRQ 685 { 686 .procname = "sysrq", 687 .data = &__sysrq_enabled, 688 .maxlen = sizeof (int), 689 .mode = 0644, 690 .proc_handler = sysrq_sysctl_handler, 691 }, 692 #endif 693 #ifdef CONFIG_PROC_SYSCTL 694 { 695 .procname = "cad_pid", 696 .data = NULL, 697 .maxlen = sizeof (int), 698 .mode = 0600, 699 .proc_handler = proc_do_cad_pid, 700 }, 701 #endif 702 { 703 .procname = "threads-max", 704 .data = &max_threads, 705 .maxlen = sizeof(int), 706 .mode = 0644, 707 .proc_handler = proc_dointvec, 708 }, 709 { 710 .procname = "random", 711 .mode = 0555, 712 .child = random_table, 713 }, 714 { 715 .procname = "usermodehelper", 716 .mode = 0555, 717 .child = usermodehelper_table, 718 }, 719 { 720 .procname = "overflowuid", 721 .data = &overflowuid, 722 .maxlen = sizeof(int), 723 .mode = 0644, 724 .proc_handler = proc_dointvec_minmax, 725 .extra1 = &minolduid, 726 .extra2 = &maxolduid, 727 }, 728 { 729 .procname = "overflowgid", 730 .data = &overflowgid, 731 .maxlen = sizeof(int), 732 .mode = 0644, 733 .proc_handler = proc_dointvec_minmax, 734 .extra1 = &minolduid, 735 .extra2 = &maxolduid, 736 }, 737 #ifdef CONFIG_S390 738 #ifdef CONFIG_MATHEMU 739 { 740 .procname = "ieee_emulation_warnings", 741 .data = &sysctl_ieee_emulation_warnings, 742 .maxlen = sizeof(int), 743 .mode = 0644, 744 .proc_handler = proc_dointvec, 745 }, 746 #endif 747 { 748 .procname = "userprocess_debug", 749 .data = &show_unhandled_signals, 750 .maxlen = sizeof(int), 751 .mode = 0644, 752 .proc_handler = proc_dointvec, 753 }, 754 #endif 755 { 756 .procname = "pid_max", 757 .data = &pid_max, 758 .maxlen = sizeof (int), 759 .mode = 0644, 760 .proc_handler = proc_dointvec_minmax, 761 .extra1 = &pid_max_min, 762 .extra2 = &pid_max_max, 763 }, 764 { 765 .procname = "panic_on_oops", 766 .data = &panic_on_oops, 767 .maxlen = sizeof(int), 768 .mode = 0644, 769 .proc_handler = proc_dointvec, 770 }, 771 #if defined CONFIG_PRINTK 772 { 773 .procname = "printk", 774 .data = &console_loglevel, 775 .maxlen = 4*sizeof(int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 { 780 .procname = "printk_ratelimit", 781 .data = &printk_ratelimit_state.interval, 782 .maxlen = sizeof(int), 783 .mode = 0644, 784 .proc_handler = proc_dointvec_jiffies, 785 }, 786 { 787 .procname = "printk_ratelimit_burst", 788 .data = &printk_ratelimit_state.burst, 789 .maxlen = sizeof(int), 790 .mode = 0644, 791 .proc_handler = proc_dointvec, 792 }, 793 { 794 .procname = "printk_delay", 795 .data = &printk_delay_msec, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec_minmax, 799 .extra1 = &zero, 800 .extra2 = &ten_thousand, 801 }, 802 { 803 .procname = "dmesg_restrict", 804 .data = &dmesg_restrict, 805 .maxlen = sizeof(int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec_minmax_sysadmin, 808 .extra1 = &zero, 809 .extra2 = &one, 810 }, 811 { 812 .procname = "kptr_restrict", 813 .data = &kptr_restrict, 814 .maxlen = sizeof(int), 815 .mode = 0644, 816 .proc_handler = proc_dointvec_minmax_sysadmin, 817 .extra1 = &zero, 818 .extra2 = &two, 819 }, 820 #endif 821 { 822 .procname = "ngroups_max", 823 .data = &ngroups_max, 824 .maxlen = sizeof (int), 825 .mode = 0444, 826 .proc_handler = proc_dointvec, 827 }, 828 { 829 .procname = "cap_last_cap", 830 .data = (void *)&cap_last_cap, 831 .maxlen = sizeof(int), 832 .mode = 0444, 833 .proc_handler = proc_dointvec, 834 }, 835 #if defined(CONFIG_LOCKUP_DETECTOR) 836 { 837 .procname = "watchdog", 838 .data = &watchdog_user_enabled, 839 .maxlen = sizeof (int), 840 .mode = 0644, 841 .proc_handler = proc_dowatchdog, 842 .extra1 = &zero, 843 .extra2 = &one, 844 }, 845 { 846 .procname = "watchdog_thresh", 847 .data = &watchdog_thresh, 848 .maxlen = sizeof(int), 849 .mode = 0644, 850 .proc_handler = proc_dowatchdog, 851 .extra1 = &zero, 852 .extra2 = &sixty, 853 }, 854 { 855 .procname = "softlockup_panic", 856 .data = &softlockup_panic, 857 .maxlen = sizeof(int), 858 .mode = 0644, 859 .proc_handler = proc_dointvec_minmax, 860 .extra1 = &zero, 861 .extra2 = &one, 862 }, 863 #ifdef CONFIG_SMP 864 { 865 .procname = "softlockup_all_cpu_backtrace", 866 .data = &sysctl_softlockup_all_cpu_backtrace, 867 .maxlen = sizeof(int), 868 .mode = 0644, 869 .proc_handler = proc_dointvec_minmax, 870 .extra1 = &zero, 871 .extra2 = &one, 872 }, 873 #endif /* CONFIG_SMP */ 874 { 875 .procname = "nmi_watchdog", 876 .data = &watchdog_user_enabled, 877 .maxlen = sizeof (int), 878 .mode = 0644, 879 .proc_handler = proc_dowatchdog, 880 .extra1 = &zero, 881 .extra2 = &one, 882 }, 883 #endif 884 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 885 { 886 .procname = "unknown_nmi_panic", 887 .data = &unknown_nmi_panic, 888 .maxlen = sizeof (int), 889 .mode = 0644, 890 .proc_handler = proc_dointvec, 891 }, 892 #endif 893 #if defined(CONFIG_X86) 894 { 895 .procname = "panic_on_unrecovered_nmi", 896 .data = &panic_on_unrecovered_nmi, 897 .maxlen = sizeof(int), 898 .mode = 0644, 899 .proc_handler = proc_dointvec, 900 }, 901 { 902 .procname = "panic_on_io_nmi", 903 .data = &panic_on_io_nmi, 904 .maxlen = sizeof(int), 905 .mode = 0644, 906 .proc_handler = proc_dointvec, 907 }, 908 #ifdef CONFIG_DEBUG_STACKOVERFLOW 909 { 910 .procname = "panic_on_stackoverflow", 911 .data = &sysctl_panic_on_stackoverflow, 912 .maxlen = sizeof(int), 913 .mode = 0644, 914 .proc_handler = proc_dointvec, 915 }, 916 #endif 917 { 918 .procname = "bootloader_type", 919 .data = &bootloader_type, 920 .maxlen = sizeof (int), 921 .mode = 0444, 922 .proc_handler = proc_dointvec, 923 }, 924 { 925 .procname = "bootloader_version", 926 .data = &bootloader_version, 927 .maxlen = sizeof (int), 928 .mode = 0444, 929 .proc_handler = proc_dointvec, 930 }, 931 { 932 .procname = "kstack_depth_to_print", 933 .data = &kstack_depth_to_print, 934 .maxlen = sizeof(int), 935 .mode = 0644, 936 .proc_handler = proc_dointvec, 937 }, 938 { 939 .procname = "io_delay_type", 940 .data = &io_delay_type, 941 .maxlen = sizeof(int), 942 .mode = 0644, 943 .proc_handler = proc_dointvec, 944 }, 945 #endif 946 #if defined(CONFIG_MMU) 947 { 948 .procname = "randomize_va_space", 949 .data = &randomize_va_space, 950 .maxlen = sizeof(int), 951 .mode = 0644, 952 .proc_handler = proc_dointvec, 953 }, 954 #endif 955 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 956 { 957 .procname = "spin_retry", 958 .data = &spin_retry, 959 .maxlen = sizeof (int), 960 .mode = 0644, 961 .proc_handler = proc_dointvec, 962 }, 963 #endif 964 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 965 { 966 .procname = "acpi_video_flags", 967 .data = &acpi_realmode_flags, 968 .maxlen = sizeof (unsigned long), 969 .mode = 0644, 970 .proc_handler = proc_doulongvec_minmax, 971 }, 972 #endif 973 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 974 { 975 .procname = "ignore-unaligned-usertrap", 976 .data = &no_unaligned_warning, 977 .maxlen = sizeof (int), 978 .mode = 0644, 979 .proc_handler = proc_dointvec, 980 }, 981 #endif 982 #ifdef CONFIG_IA64 983 { 984 .procname = "unaligned-dump-stack", 985 .data = &unaligned_dump_stack, 986 .maxlen = sizeof (int), 987 .mode = 0644, 988 .proc_handler = proc_dointvec, 989 }, 990 #endif 991 #ifdef CONFIG_DETECT_HUNG_TASK 992 { 993 .procname = "hung_task_panic", 994 .data = &sysctl_hung_task_panic, 995 .maxlen = sizeof(int), 996 .mode = 0644, 997 .proc_handler = proc_dointvec_minmax, 998 .extra1 = &zero, 999 .extra2 = &one, 1000 }, 1001 { 1002 .procname = "hung_task_check_count", 1003 .data = &sysctl_hung_task_check_count, 1004 .maxlen = sizeof(int), 1005 .mode = 0644, 1006 .proc_handler = proc_dointvec_minmax, 1007 .extra1 = &zero, 1008 }, 1009 { 1010 .procname = "hung_task_timeout_secs", 1011 .data = &sysctl_hung_task_timeout_secs, 1012 .maxlen = sizeof(unsigned long), 1013 .mode = 0644, 1014 .proc_handler = proc_dohung_task_timeout_secs, 1015 .extra2 = &hung_task_timeout_max, 1016 }, 1017 { 1018 .procname = "hung_task_warnings", 1019 .data = &sysctl_hung_task_warnings, 1020 .maxlen = sizeof(int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec_minmax, 1023 .extra1 = &neg_one, 1024 }, 1025 #endif 1026 #ifdef CONFIG_COMPAT 1027 { 1028 .procname = "compat-log", 1029 .data = &compat_log, 1030 .maxlen = sizeof (int), 1031 .mode = 0644, 1032 .proc_handler = proc_dointvec, 1033 }, 1034 #endif 1035 #ifdef CONFIG_RT_MUTEXES 1036 { 1037 .procname = "max_lock_depth", 1038 .data = &max_lock_depth, 1039 .maxlen = sizeof(int), 1040 .mode = 0644, 1041 .proc_handler = proc_dointvec, 1042 }, 1043 #endif 1044 { 1045 .procname = "poweroff_cmd", 1046 .data = &poweroff_cmd, 1047 .maxlen = POWEROFF_CMD_PATH_LEN, 1048 .mode = 0644, 1049 .proc_handler = proc_dostring, 1050 }, 1051 #ifdef CONFIG_KEYS 1052 { 1053 .procname = "keys", 1054 .mode = 0555, 1055 .child = key_sysctls, 1056 }, 1057 #endif 1058 #ifdef CONFIG_PERF_EVENTS 1059 /* 1060 * User-space scripts rely on the existence of this file 1061 * as a feature check for perf_events being enabled. 1062 * 1063 * So it's an ABI, do not remove! 1064 */ 1065 { 1066 .procname = "perf_event_paranoid", 1067 .data = &sysctl_perf_event_paranoid, 1068 .maxlen = sizeof(sysctl_perf_event_paranoid), 1069 .mode = 0644, 1070 .proc_handler = proc_dointvec, 1071 }, 1072 { 1073 .procname = "perf_event_mlock_kb", 1074 .data = &sysctl_perf_event_mlock, 1075 .maxlen = sizeof(sysctl_perf_event_mlock), 1076 .mode = 0644, 1077 .proc_handler = proc_dointvec, 1078 }, 1079 { 1080 .procname = "perf_event_max_sample_rate", 1081 .data = &sysctl_perf_event_sample_rate, 1082 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1083 .mode = 0644, 1084 .proc_handler = perf_proc_update_handler, 1085 .extra1 = &one, 1086 }, 1087 { 1088 .procname = "perf_cpu_time_max_percent", 1089 .data = &sysctl_perf_cpu_time_max_percent, 1090 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1091 .mode = 0644, 1092 .proc_handler = perf_cpu_time_max_percent_handler, 1093 .extra1 = &zero, 1094 .extra2 = &one_hundred, 1095 }, 1096 #endif 1097 #ifdef CONFIG_KMEMCHECK 1098 { 1099 .procname = "kmemcheck", 1100 .data = &kmemcheck_enabled, 1101 .maxlen = sizeof(int), 1102 .mode = 0644, 1103 .proc_handler = proc_dointvec, 1104 }, 1105 #endif 1106 { } 1107 }; 1108 1109 static struct ctl_table vm_table[] = { 1110 { 1111 .procname = "overcommit_memory", 1112 .data = &sysctl_overcommit_memory, 1113 .maxlen = sizeof(sysctl_overcommit_memory), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec_minmax, 1116 .extra1 = &zero, 1117 .extra2 = &two, 1118 }, 1119 { 1120 .procname = "panic_on_oom", 1121 .data = &sysctl_panic_on_oom, 1122 .maxlen = sizeof(sysctl_panic_on_oom), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec_minmax, 1125 .extra1 = &zero, 1126 .extra2 = &two, 1127 }, 1128 { 1129 .procname = "oom_kill_allocating_task", 1130 .data = &sysctl_oom_kill_allocating_task, 1131 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1132 .mode = 0644, 1133 .proc_handler = proc_dointvec, 1134 }, 1135 { 1136 .procname = "oom_dump_tasks", 1137 .data = &sysctl_oom_dump_tasks, 1138 .maxlen = sizeof(sysctl_oom_dump_tasks), 1139 .mode = 0644, 1140 .proc_handler = proc_dointvec, 1141 }, 1142 { 1143 .procname = "overcommit_ratio", 1144 .data = &sysctl_overcommit_ratio, 1145 .maxlen = sizeof(sysctl_overcommit_ratio), 1146 .mode = 0644, 1147 .proc_handler = overcommit_ratio_handler, 1148 }, 1149 { 1150 .procname = "overcommit_kbytes", 1151 .data = &sysctl_overcommit_kbytes, 1152 .maxlen = sizeof(sysctl_overcommit_kbytes), 1153 .mode = 0644, 1154 .proc_handler = overcommit_kbytes_handler, 1155 }, 1156 { 1157 .procname = "page-cluster", 1158 .data = &page_cluster, 1159 .maxlen = sizeof(int), 1160 .mode = 0644, 1161 .proc_handler = proc_dointvec_minmax, 1162 .extra1 = &zero, 1163 }, 1164 { 1165 .procname = "dirty_background_ratio", 1166 .data = &dirty_background_ratio, 1167 .maxlen = sizeof(dirty_background_ratio), 1168 .mode = 0644, 1169 .proc_handler = dirty_background_ratio_handler, 1170 .extra1 = &zero, 1171 .extra2 = &one_hundred, 1172 }, 1173 { 1174 .procname = "dirty_background_bytes", 1175 .data = &dirty_background_bytes, 1176 .maxlen = sizeof(dirty_background_bytes), 1177 .mode = 0644, 1178 .proc_handler = dirty_background_bytes_handler, 1179 .extra1 = &one_ul, 1180 }, 1181 { 1182 .procname = "dirty_ratio", 1183 .data = &vm_dirty_ratio, 1184 .maxlen = sizeof(vm_dirty_ratio), 1185 .mode = 0644, 1186 .proc_handler = dirty_ratio_handler, 1187 .extra1 = &zero, 1188 .extra2 = &one_hundred, 1189 }, 1190 { 1191 .procname = "dirty_bytes", 1192 .data = &vm_dirty_bytes, 1193 .maxlen = sizeof(vm_dirty_bytes), 1194 .mode = 0644, 1195 .proc_handler = dirty_bytes_handler, 1196 .extra1 = &dirty_bytes_min, 1197 }, 1198 { 1199 .procname = "dirty_writeback_centisecs", 1200 .data = &dirty_writeback_interval, 1201 .maxlen = sizeof(dirty_writeback_interval), 1202 .mode = 0644, 1203 .proc_handler = dirty_writeback_centisecs_handler, 1204 }, 1205 { 1206 .procname = "dirty_expire_centisecs", 1207 .data = &dirty_expire_interval, 1208 .maxlen = sizeof(dirty_expire_interval), 1209 .mode = 0644, 1210 .proc_handler = proc_dointvec_minmax, 1211 .extra1 = &zero, 1212 }, 1213 { 1214 .procname = "nr_pdflush_threads", 1215 .mode = 0444 /* read-only */, 1216 .proc_handler = pdflush_proc_obsolete, 1217 }, 1218 { 1219 .procname = "swappiness", 1220 .data = &vm_swappiness, 1221 .maxlen = sizeof(vm_swappiness), 1222 .mode = 0644, 1223 .proc_handler = proc_dointvec_minmax, 1224 .extra1 = &zero, 1225 .extra2 = &one_hundred, 1226 }, 1227 #ifdef CONFIG_HUGETLB_PAGE 1228 { 1229 .procname = "nr_hugepages", 1230 .data = NULL, 1231 .maxlen = sizeof(unsigned long), 1232 .mode = 0644, 1233 .proc_handler = hugetlb_sysctl_handler, 1234 .extra1 = &zero, 1235 }, 1236 #ifdef CONFIG_NUMA 1237 { 1238 .procname = "nr_hugepages_mempolicy", 1239 .data = NULL, 1240 .maxlen = sizeof(unsigned long), 1241 .mode = 0644, 1242 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1243 .extra1 = &zero, 1244 }, 1245 #endif 1246 { 1247 .procname = "hugetlb_shm_group", 1248 .data = &sysctl_hugetlb_shm_group, 1249 .maxlen = sizeof(gid_t), 1250 .mode = 0644, 1251 .proc_handler = proc_dointvec, 1252 }, 1253 { 1254 .procname = "hugepages_treat_as_movable", 1255 .data = &hugepages_treat_as_movable, 1256 .maxlen = sizeof(int), 1257 .mode = 0644, 1258 .proc_handler = proc_dointvec, 1259 }, 1260 { 1261 .procname = "nr_overcommit_hugepages", 1262 .data = NULL, 1263 .maxlen = sizeof(unsigned long), 1264 .mode = 0644, 1265 .proc_handler = hugetlb_overcommit_handler, 1266 .extra1 = &zero, 1267 }, 1268 #endif 1269 { 1270 .procname = "lowmem_reserve_ratio", 1271 .data = &sysctl_lowmem_reserve_ratio, 1272 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1273 .mode = 0644, 1274 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1275 }, 1276 { 1277 .procname = "drop_caches", 1278 .data = &sysctl_drop_caches, 1279 .maxlen = sizeof(int), 1280 .mode = 0644, 1281 .proc_handler = drop_caches_sysctl_handler, 1282 .extra1 = &one, 1283 .extra2 = &four, 1284 }, 1285 #ifdef CONFIG_COMPACTION 1286 { 1287 .procname = "compact_memory", 1288 .data = &sysctl_compact_memory, 1289 .maxlen = sizeof(int), 1290 .mode = 0200, 1291 .proc_handler = sysctl_compaction_handler, 1292 }, 1293 { 1294 .procname = "extfrag_threshold", 1295 .data = &sysctl_extfrag_threshold, 1296 .maxlen = sizeof(int), 1297 .mode = 0644, 1298 .proc_handler = sysctl_extfrag_handler, 1299 .extra1 = &min_extfrag_threshold, 1300 .extra2 = &max_extfrag_threshold, 1301 }, 1302 1303 #endif /* CONFIG_COMPACTION */ 1304 { 1305 .procname = "min_free_kbytes", 1306 .data = &min_free_kbytes, 1307 .maxlen = sizeof(min_free_kbytes), 1308 .mode = 0644, 1309 .proc_handler = min_free_kbytes_sysctl_handler, 1310 .extra1 = &zero, 1311 }, 1312 { 1313 .procname = "percpu_pagelist_fraction", 1314 .data = &percpu_pagelist_fraction, 1315 .maxlen = sizeof(percpu_pagelist_fraction), 1316 .mode = 0644, 1317 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1318 .extra1 = &zero, 1319 }, 1320 #ifdef CONFIG_MMU 1321 { 1322 .procname = "max_map_count", 1323 .data = &sysctl_max_map_count, 1324 .maxlen = sizeof(sysctl_max_map_count), 1325 .mode = 0644, 1326 .proc_handler = proc_dointvec_minmax, 1327 .extra1 = &zero, 1328 }, 1329 #else 1330 { 1331 .procname = "nr_trim_pages", 1332 .data = &sysctl_nr_trim_pages, 1333 .maxlen = sizeof(sysctl_nr_trim_pages), 1334 .mode = 0644, 1335 .proc_handler = proc_dointvec_minmax, 1336 .extra1 = &zero, 1337 }, 1338 #endif 1339 { 1340 .procname = "laptop_mode", 1341 .data = &laptop_mode, 1342 .maxlen = sizeof(laptop_mode), 1343 .mode = 0644, 1344 .proc_handler = proc_dointvec_jiffies, 1345 }, 1346 { 1347 .procname = "block_dump", 1348 .data = &block_dump, 1349 .maxlen = sizeof(block_dump), 1350 .mode = 0644, 1351 .proc_handler = proc_dointvec, 1352 .extra1 = &zero, 1353 }, 1354 { 1355 .procname = "vfs_cache_pressure", 1356 .data = &sysctl_vfs_cache_pressure, 1357 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1358 .mode = 0644, 1359 .proc_handler = proc_dointvec, 1360 .extra1 = &zero, 1361 }, 1362 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1363 { 1364 .procname = "legacy_va_layout", 1365 .data = &sysctl_legacy_va_layout, 1366 .maxlen = sizeof(sysctl_legacy_va_layout), 1367 .mode = 0644, 1368 .proc_handler = proc_dointvec, 1369 .extra1 = &zero, 1370 }, 1371 #endif 1372 #ifdef CONFIG_NUMA 1373 { 1374 .procname = "zone_reclaim_mode", 1375 .data = &zone_reclaim_mode, 1376 .maxlen = sizeof(zone_reclaim_mode), 1377 .mode = 0644, 1378 .proc_handler = proc_dointvec, 1379 .extra1 = &zero, 1380 }, 1381 { 1382 .procname = "min_unmapped_ratio", 1383 .data = &sysctl_min_unmapped_ratio, 1384 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1385 .mode = 0644, 1386 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1387 .extra1 = &zero, 1388 .extra2 = &one_hundred, 1389 }, 1390 { 1391 .procname = "min_slab_ratio", 1392 .data = &sysctl_min_slab_ratio, 1393 .maxlen = sizeof(sysctl_min_slab_ratio), 1394 .mode = 0644, 1395 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1396 .extra1 = &zero, 1397 .extra2 = &one_hundred, 1398 }, 1399 #endif 1400 #ifdef CONFIG_SMP 1401 { 1402 .procname = "stat_interval", 1403 .data = &sysctl_stat_interval, 1404 .maxlen = sizeof(sysctl_stat_interval), 1405 .mode = 0644, 1406 .proc_handler = proc_dointvec_jiffies, 1407 }, 1408 #endif 1409 #ifdef CONFIG_MMU 1410 { 1411 .procname = "mmap_min_addr", 1412 .data = &dac_mmap_min_addr, 1413 .maxlen = sizeof(unsigned long), 1414 .mode = 0644, 1415 .proc_handler = mmap_min_addr_handler, 1416 }, 1417 #endif 1418 #ifdef CONFIG_NUMA 1419 { 1420 .procname = "numa_zonelist_order", 1421 .data = &numa_zonelist_order, 1422 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1423 .mode = 0644, 1424 .proc_handler = numa_zonelist_order_handler, 1425 }, 1426 #endif 1427 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1428 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1429 { 1430 .procname = "vdso_enabled", 1431 #ifdef CONFIG_X86_32 1432 .data = &vdso32_enabled, 1433 .maxlen = sizeof(vdso32_enabled), 1434 #else 1435 .data = &vdso_enabled, 1436 .maxlen = sizeof(vdso_enabled), 1437 #endif 1438 .mode = 0644, 1439 .proc_handler = proc_dointvec, 1440 .extra1 = &zero, 1441 }, 1442 #endif 1443 #ifdef CONFIG_HIGHMEM 1444 { 1445 .procname = "highmem_is_dirtyable", 1446 .data = &vm_highmem_is_dirtyable, 1447 .maxlen = sizeof(vm_highmem_is_dirtyable), 1448 .mode = 0644, 1449 .proc_handler = proc_dointvec_minmax, 1450 .extra1 = &zero, 1451 .extra2 = &one, 1452 }, 1453 #endif 1454 #ifdef CONFIG_MEMORY_FAILURE 1455 { 1456 .procname = "memory_failure_early_kill", 1457 .data = &sysctl_memory_failure_early_kill, 1458 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1459 .mode = 0644, 1460 .proc_handler = proc_dointvec_minmax, 1461 .extra1 = &zero, 1462 .extra2 = &one, 1463 }, 1464 { 1465 .procname = "memory_failure_recovery", 1466 .data = &sysctl_memory_failure_recovery, 1467 .maxlen = sizeof(sysctl_memory_failure_recovery), 1468 .mode = 0644, 1469 .proc_handler = proc_dointvec_minmax, 1470 .extra1 = &zero, 1471 .extra2 = &one, 1472 }, 1473 #endif 1474 { 1475 .procname = "user_reserve_kbytes", 1476 .data = &sysctl_user_reserve_kbytes, 1477 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1478 .mode = 0644, 1479 .proc_handler = proc_doulongvec_minmax, 1480 }, 1481 { 1482 .procname = "admin_reserve_kbytes", 1483 .data = &sysctl_admin_reserve_kbytes, 1484 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1485 .mode = 0644, 1486 .proc_handler = proc_doulongvec_minmax, 1487 }, 1488 { } 1489 }; 1490 1491 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1492 static struct ctl_table binfmt_misc_table[] = { 1493 { } 1494 }; 1495 #endif 1496 1497 static struct ctl_table fs_table[] = { 1498 { 1499 .procname = "inode-nr", 1500 .data = &inodes_stat, 1501 .maxlen = 2*sizeof(long), 1502 .mode = 0444, 1503 .proc_handler = proc_nr_inodes, 1504 }, 1505 { 1506 .procname = "inode-state", 1507 .data = &inodes_stat, 1508 .maxlen = 7*sizeof(long), 1509 .mode = 0444, 1510 .proc_handler = proc_nr_inodes, 1511 }, 1512 { 1513 .procname = "file-nr", 1514 .data = &files_stat, 1515 .maxlen = sizeof(files_stat), 1516 .mode = 0444, 1517 .proc_handler = proc_nr_files, 1518 }, 1519 { 1520 .procname = "file-max", 1521 .data = &files_stat.max_files, 1522 .maxlen = sizeof(files_stat.max_files), 1523 .mode = 0644, 1524 .proc_handler = proc_doulongvec_minmax, 1525 }, 1526 { 1527 .procname = "nr_open", 1528 .data = &sysctl_nr_open, 1529 .maxlen = sizeof(int), 1530 .mode = 0644, 1531 .proc_handler = proc_dointvec_minmax, 1532 .extra1 = &sysctl_nr_open_min, 1533 .extra2 = &sysctl_nr_open_max, 1534 }, 1535 { 1536 .procname = "dentry-state", 1537 .data = &dentry_stat, 1538 .maxlen = 6*sizeof(long), 1539 .mode = 0444, 1540 .proc_handler = proc_nr_dentry, 1541 }, 1542 { 1543 .procname = "overflowuid", 1544 .data = &fs_overflowuid, 1545 .maxlen = sizeof(int), 1546 .mode = 0644, 1547 .proc_handler = proc_dointvec_minmax, 1548 .extra1 = &minolduid, 1549 .extra2 = &maxolduid, 1550 }, 1551 { 1552 .procname = "overflowgid", 1553 .data = &fs_overflowgid, 1554 .maxlen = sizeof(int), 1555 .mode = 0644, 1556 .proc_handler = proc_dointvec_minmax, 1557 .extra1 = &minolduid, 1558 .extra2 = &maxolduid, 1559 }, 1560 #ifdef CONFIG_FILE_LOCKING 1561 { 1562 .procname = "leases-enable", 1563 .data = &leases_enable, 1564 .maxlen = sizeof(int), 1565 .mode = 0644, 1566 .proc_handler = proc_dointvec, 1567 }, 1568 #endif 1569 #ifdef CONFIG_DNOTIFY 1570 { 1571 .procname = "dir-notify-enable", 1572 .data = &dir_notify_enable, 1573 .maxlen = sizeof(int), 1574 .mode = 0644, 1575 .proc_handler = proc_dointvec, 1576 }, 1577 #endif 1578 #ifdef CONFIG_MMU 1579 #ifdef CONFIG_FILE_LOCKING 1580 { 1581 .procname = "lease-break-time", 1582 .data = &lease_break_time, 1583 .maxlen = sizeof(int), 1584 .mode = 0644, 1585 .proc_handler = proc_dointvec, 1586 }, 1587 #endif 1588 #ifdef CONFIG_AIO 1589 { 1590 .procname = "aio-nr", 1591 .data = &aio_nr, 1592 .maxlen = sizeof(aio_nr), 1593 .mode = 0444, 1594 .proc_handler = proc_doulongvec_minmax, 1595 }, 1596 { 1597 .procname = "aio-max-nr", 1598 .data = &aio_max_nr, 1599 .maxlen = sizeof(aio_max_nr), 1600 .mode = 0644, 1601 .proc_handler = proc_doulongvec_minmax, 1602 }, 1603 #endif /* CONFIG_AIO */ 1604 #ifdef CONFIG_INOTIFY_USER 1605 { 1606 .procname = "inotify", 1607 .mode = 0555, 1608 .child = inotify_table, 1609 }, 1610 #endif 1611 #ifdef CONFIG_EPOLL 1612 { 1613 .procname = "epoll", 1614 .mode = 0555, 1615 .child = epoll_table, 1616 }, 1617 #endif 1618 #endif 1619 { 1620 .procname = "protected_symlinks", 1621 .data = &sysctl_protected_symlinks, 1622 .maxlen = sizeof(int), 1623 .mode = 0600, 1624 .proc_handler = proc_dointvec_minmax, 1625 .extra1 = &zero, 1626 .extra2 = &one, 1627 }, 1628 { 1629 .procname = "protected_hardlinks", 1630 .data = &sysctl_protected_hardlinks, 1631 .maxlen = sizeof(int), 1632 .mode = 0600, 1633 .proc_handler = proc_dointvec_minmax, 1634 .extra1 = &zero, 1635 .extra2 = &one, 1636 }, 1637 { 1638 .procname = "suid_dumpable", 1639 .data = &suid_dumpable, 1640 .maxlen = sizeof(int), 1641 .mode = 0644, 1642 .proc_handler = proc_dointvec_minmax_coredump, 1643 .extra1 = &zero, 1644 .extra2 = &two, 1645 }, 1646 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1647 { 1648 .procname = "binfmt_misc", 1649 .mode = 0555, 1650 .child = binfmt_misc_table, 1651 }, 1652 #endif 1653 { 1654 .procname = "pipe-max-size", 1655 .data = &pipe_max_size, 1656 .maxlen = sizeof(int), 1657 .mode = 0644, 1658 .proc_handler = &pipe_proc_fn, 1659 .extra1 = &pipe_min_size, 1660 }, 1661 { } 1662 }; 1663 1664 static struct ctl_table debug_table[] = { 1665 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1666 { 1667 .procname = "exception-trace", 1668 .data = &show_unhandled_signals, 1669 .maxlen = sizeof(int), 1670 .mode = 0644, 1671 .proc_handler = proc_dointvec 1672 }, 1673 #endif 1674 #if defined(CONFIG_OPTPROBES) 1675 { 1676 .procname = "kprobes-optimization", 1677 .data = &sysctl_kprobes_optimization, 1678 .maxlen = sizeof(int), 1679 .mode = 0644, 1680 .proc_handler = proc_kprobes_optimization_handler, 1681 .extra1 = &zero, 1682 .extra2 = &one, 1683 }, 1684 #endif 1685 { } 1686 }; 1687 1688 static struct ctl_table dev_table[] = { 1689 { } 1690 }; 1691 1692 int __init sysctl_init(void) 1693 { 1694 struct ctl_table_header *hdr; 1695 1696 hdr = register_sysctl_table(sysctl_base_table); 1697 kmemleak_not_leak(hdr); 1698 return 0; 1699 } 1700 1701 #endif /* CONFIG_SYSCTL */ 1702 1703 /* 1704 * /proc/sys support 1705 */ 1706 1707 #ifdef CONFIG_PROC_SYSCTL 1708 1709 static int _proc_do_string(char *data, int maxlen, int write, 1710 char __user *buffer, 1711 size_t *lenp, loff_t *ppos) 1712 { 1713 size_t len; 1714 char __user *p; 1715 char c; 1716 1717 if (!data || !maxlen || !*lenp) { 1718 *lenp = 0; 1719 return 0; 1720 } 1721 1722 if (write) { 1723 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1724 /* Only continue writes not past the end of buffer. */ 1725 len = strlen(data); 1726 if (len > maxlen - 1) 1727 len = maxlen - 1; 1728 1729 if (*ppos > len) 1730 return 0; 1731 len = *ppos; 1732 } else { 1733 /* Start writing from beginning of buffer. */ 1734 len = 0; 1735 } 1736 1737 *ppos += *lenp; 1738 p = buffer; 1739 while ((p - buffer) < *lenp && len < maxlen - 1) { 1740 if (get_user(c, p++)) 1741 return -EFAULT; 1742 if (c == 0 || c == '\n') 1743 break; 1744 data[len++] = c; 1745 } 1746 data[len] = 0; 1747 } else { 1748 len = strlen(data); 1749 if (len > maxlen) 1750 len = maxlen; 1751 1752 if (*ppos > len) { 1753 *lenp = 0; 1754 return 0; 1755 } 1756 1757 data += *ppos; 1758 len -= *ppos; 1759 1760 if (len > *lenp) 1761 len = *lenp; 1762 if (len) 1763 if (copy_to_user(buffer, data, len)) 1764 return -EFAULT; 1765 if (len < *lenp) { 1766 if (put_user('\n', buffer + len)) 1767 return -EFAULT; 1768 len++; 1769 } 1770 *lenp = len; 1771 *ppos += len; 1772 } 1773 return 0; 1774 } 1775 1776 static void warn_sysctl_write(struct ctl_table *table) 1777 { 1778 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1779 "This will not be supported in the future. To silence this\n" 1780 "warning, set kernel.sysctl_writes_strict = -1\n", 1781 current->comm, table->procname); 1782 } 1783 1784 /** 1785 * proc_dostring - read a string sysctl 1786 * @table: the sysctl table 1787 * @write: %TRUE if this is a write to the sysctl file 1788 * @buffer: the user buffer 1789 * @lenp: the size of the user buffer 1790 * @ppos: file position 1791 * 1792 * Reads/writes a string from/to the user buffer. If the kernel 1793 * buffer provided is not large enough to hold the string, the 1794 * string is truncated. The copied string is %NULL-terminated. 1795 * If the string is being read by the user process, it is copied 1796 * and a newline '\n' is added. It is truncated if the buffer is 1797 * not large enough. 1798 * 1799 * Returns 0 on success. 1800 */ 1801 int proc_dostring(struct ctl_table *table, int write, 1802 void __user *buffer, size_t *lenp, loff_t *ppos) 1803 { 1804 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1805 warn_sysctl_write(table); 1806 1807 return _proc_do_string((char *)(table->data), table->maxlen, write, 1808 (char __user *)buffer, lenp, ppos); 1809 } 1810 1811 static size_t proc_skip_spaces(char **buf) 1812 { 1813 size_t ret; 1814 char *tmp = skip_spaces(*buf); 1815 ret = tmp - *buf; 1816 *buf = tmp; 1817 return ret; 1818 } 1819 1820 static void proc_skip_char(char **buf, size_t *size, const char v) 1821 { 1822 while (*size) { 1823 if (**buf != v) 1824 break; 1825 (*size)--; 1826 (*buf)++; 1827 } 1828 } 1829 1830 #define TMPBUFLEN 22 1831 /** 1832 * proc_get_long - reads an ASCII formatted integer from a user buffer 1833 * 1834 * @buf: a kernel buffer 1835 * @size: size of the kernel buffer 1836 * @val: this is where the number will be stored 1837 * @neg: set to %TRUE if number is negative 1838 * @perm_tr: a vector which contains the allowed trailers 1839 * @perm_tr_len: size of the perm_tr vector 1840 * @tr: pointer to store the trailer character 1841 * 1842 * In case of success %0 is returned and @buf and @size are updated with 1843 * the amount of bytes read. If @tr is non-NULL and a trailing 1844 * character exists (size is non-zero after returning from this 1845 * function), @tr is updated with the trailing character. 1846 */ 1847 static int proc_get_long(char **buf, size_t *size, 1848 unsigned long *val, bool *neg, 1849 const char *perm_tr, unsigned perm_tr_len, char *tr) 1850 { 1851 int len; 1852 char *p, tmp[TMPBUFLEN]; 1853 1854 if (!*size) 1855 return -EINVAL; 1856 1857 len = *size; 1858 if (len > TMPBUFLEN - 1) 1859 len = TMPBUFLEN - 1; 1860 1861 memcpy(tmp, *buf, len); 1862 1863 tmp[len] = 0; 1864 p = tmp; 1865 if (*p == '-' && *size > 1) { 1866 *neg = true; 1867 p++; 1868 } else 1869 *neg = false; 1870 if (!isdigit(*p)) 1871 return -EINVAL; 1872 1873 *val = simple_strtoul(p, &p, 0); 1874 1875 len = p - tmp; 1876 1877 /* We don't know if the next char is whitespace thus we may accept 1878 * invalid integers (e.g. 1234...a) or two integers instead of one 1879 * (e.g. 123...1). So lets not allow such large numbers. */ 1880 if (len == TMPBUFLEN - 1) 1881 return -EINVAL; 1882 1883 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 1884 return -EINVAL; 1885 1886 if (tr && (len < *size)) 1887 *tr = *p; 1888 1889 *buf += len; 1890 *size -= len; 1891 1892 return 0; 1893 } 1894 1895 /** 1896 * proc_put_long - converts an integer to a decimal ASCII formatted string 1897 * 1898 * @buf: the user buffer 1899 * @size: the size of the user buffer 1900 * @val: the integer to be converted 1901 * @neg: sign of the number, %TRUE for negative 1902 * 1903 * In case of success %0 is returned and @buf and @size are updated with 1904 * the amount of bytes written. 1905 */ 1906 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 1907 bool neg) 1908 { 1909 int len; 1910 char tmp[TMPBUFLEN], *p = tmp; 1911 1912 sprintf(p, "%s%lu", neg ? "-" : "", val); 1913 len = strlen(tmp); 1914 if (len > *size) 1915 len = *size; 1916 if (copy_to_user(*buf, tmp, len)) 1917 return -EFAULT; 1918 *size -= len; 1919 *buf += len; 1920 return 0; 1921 } 1922 #undef TMPBUFLEN 1923 1924 static int proc_put_char(void __user **buf, size_t *size, char c) 1925 { 1926 if (*size) { 1927 char __user **buffer = (char __user **)buf; 1928 if (put_user(c, *buffer)) 1929 return -EFAULT; 1930 (*size)--, (*buffer)++; 1931 *buf = *buffer; 1932 } 1933 return 0; 1934 } 1935 1936 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 1937 int *valp, 1938 int write, void *data) 1939 { 1940 if (write) { 1941 *valp = *negp ? -*lvalp : *lvalp; 1942 } else { 1943 int val = *valp; 1944 if (val < 0) { 1945 *negp = true; 1946 *lvalp = (unsigned long)-val; 1947 } else { 1948 *negp = false; 1949 *lvalp = (unsigned long)val; 1950 } 1951 } 1952 return 0; 1953 } 1954 1955 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 1956 1957 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1958 int write, void __user *buffer, 1959 size_t *lenp, loff_t *ppos, 1960 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 1961 int write, void *data), 1962 void *data) 1963 { 1964 int *i, vleft, first = 1, err = 0; 1965 unsigned long page = 0; 1966 size_t left; 1967 char *kbuf; 1968 1969 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 1970 *lenp = 0; 1971 return 0; 1972 } 1973 1974 i = (int *) tbl_data; 1975 vleft = table->maxlen / sizeof(*i); 1976 left = *lenp; 1977 1978 if (!conv) 1979 conv = do_proc_dointvec_conv; 1980 1981 if (write) { 1982 if (*ppos) { 1983 switch (sysctl_writes_strict) { 1984 case SYSCTL_WRITES_STRICT: 1985 goto out; 1986 case SYSCTL_WRITES_WARN: 1987 warn_sysctl_write(table); 1988 break; 1989 default: 1990 break; 1991 } 1992 } 1993 1994 if (left > PAGE_SIZE - 1) 1995 left = PAGE_SIZE - 1; 1996 page = __get_free_page(GFP_TEMPORARY); 1997 kbuf = (char *) page; 1998 if (!kbuf) 1999 return -ENOMEM; 2000 if (copy_from_user(kbuf, buffer, left)) { 2001 err = -EFAULT; 2002 goto free; 2003 } 2004 kbuf[left] = 0; 2005 } 2006 2007 for (; left && vleft--; i++, first=0) { 2008 unsigned long lval; 2009 bool neg; 2010 2011 if (write) { 2012 left -= proc_skip_spaces(&kbuf); 2013 2014 if (!left) 2015 break; 2016 err = proc_get_long(&kbuf, &left, &lval, &neg, 2017 proc_wspace_sep, 2018 sizeof(proc_wspace_sep), NULL); 2019 if (err) 2020 break; 2021 if (conv(&neg, &lval, i, 1, data)) { 2022 err = -EINVAL; 2023 break; 2024 } 2025 } else { 2026 if (conv(&neg, &lval, i, 0, data)) { 2027 err = -EINVAL; 2028 break; 2029 } 2030 if (!first) 2031 err = proc_put_char(&buffer, &left, '\t'); 2032 if (err) 2033 break; 2034 err = proc_put_long(&buffer, &left, lval, neg); 2035 if (err) 2036 break; 2037 } 2038 } 2039 2040 if (!write && !first && left && !err) 2041 err = proc_put_char(&buffer, &left, '\n'); 2042 if (write && !err && left) 2043 left -= proc_skip_spaces(&kbuf); 2044 free: 2045 if (write) { 2046 free_page(page); 2047 if (first) 2048 return err ? : -EINVAL; 2049 } 2050 *lenp -= left; 2051 out: 2052 *ppos += *lenp; 2053 return err; 2054 } 2055 2056 static int do_proc_dointvec(struct ctl_table *table, int write, 2057 void __user *buffer, size_t *lenp, loff_t *ppos, 2058 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2059 int write, void *data), 2060 void *data) 2061 { 2062 return __do_proc_dointvec(table->data, table, write, 2063 buffer, lenp, ppos, conv, data); 2064 } 2065 2066 /** 2067 * proc_dointvec - read a vector of integers 2068 * @table: the sysctl table 2069 * @write: %TRUE if this is a write to the sysctl file 2070 * @buffer: the user buffer 2071 * @lenp: the size of the user buffer 2072 * @ppos: file position 2073 * 2074 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2075 * values from/to the user buffer, treated as an ASCII string. 2076 * 2077 * Returns 0 on success. 2078 */ 2079 int proc_dointvec(struct ctl_table *table, int write, 2080 void __user *buffer, size_t *lenp, loff_t *ppos) 2081 { 2082 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2083 NULL,NULL); 2084 } 2085 2086 /* 2087 * Taint values can only be increased 2088 * This means we can safely use a temporary. 2089 */ 2090 static int proc_taint(struct ctl_table *table, int write, 2091 void __user *buffer, size_t *lenp, loff_t *ppos) 2092 { 2093 struct ctl_table t; 2094 unsigned long tmptaint = get_taint(); 2095 int err; 2096 2097 if (write && !capable(CAP_SYS_ADMIN)) 2098 return -EPERM; 2099 2100 t = *table; 2101 t.data = &tmptaint; 2102 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2103 if (err < 0) 2104 return err; 2105 2106 if (write) { 2107 /* 2108 * Poor man's atomic or. Not worth adding a primitive 2109 * to everyone's atomic.h for this 2110 */ 2111 int i; 2112 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2113 if ((tmptaint >> i) & 1) 2114 add_taint(i, LOCKDEP_STILL_OK); 2115 } 2116 } 2117 2118 return err; 2119 } 2120 2121 #ifdef CONFIG_PRINTK 2122 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2123 void __user *buffer, size_t *lenp, loff_t *ppos) 2124 { 2125 if (write && !capable(CAP_SYS_ADMIN)) 2126 return -EPERM; 2127 2128 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2129 } 2130 #endif 2131 2132 struct do_proc_dointvec_minmax_conv_param { 2133 int *min; 2134 int *max; 2135 }; 2136 2137 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2138 int *valp, 2139 int write, void *data) 2140 { 2141 struct do_proc_dointvec_minmax_conv_param *param = data; 2142 if (write) { 2143 int val = *negp ? -*lvalp : *lvalp; 2144 if ((param->min && *param->min > val) || 2145 (param->max && *param->max < val)) 2146 return -EINVAL; 2147 *valp = val; 2148 } else { 2149 int val = *valp; 2150 if (val < 0) { 2151 *negp = true; 2152 *lvalp = (unsigned long)-val; 2153 } else { 2154 *negp = false; 2155 *lvalp = (unsigned long)val; 2156 } 2157 } 2158 return 0; 2159 } 2160 2161 /** 2162 * proc_dointvec_minmax - read a vector of integers with min/max values 2163 * @table: the sysctl table 2164 * @write: %TRUE if this is a write to the sysctl file 2165 * @buffer: the user buffer 2166 * @lenp: the size of the user buffer 2167 * @ppos: file position 2168 * 2169 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2170 * values from/to the user buffer, treated as an ASCII string. 2171 * 2172 * This routine will ensure the values are within the range specified by 2173 * table->extra1 (min) and table->extra2 (max). 2174 * 2175 * Returns 0 on success. 2176 */ 2177 int proc_dointvec_minmax(struct ctl_table *table, int write, 2178 void __user *buffer, size_t *lenp, loff_t *ppos) 2179 { 2180 struct do_proc_dointvec_minmax_conv_param param = { 2181 .min = (int *) table->extra1, 2182 .max = (int *) table->extra2, 2183 }; 2184 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2185 do_proc_dointvec_minmax_conv, ¶m); 2186 } 2187 2188 static void validate_coredump_safety(void) 2189 { 2190 #ifdef CONFIG_COREDUMP 2191 if (suid_dumpable == SUID_DUMP_ROOT && 2192 core_pattern[0] != '/' && core_pattern[0] != '|') { 2193 printk(KERN_WARNING "Unsafe core_pattern used with "\ 2194 "suid_dumpable=2. Pipe handler or fully qualified "\ 2195 "core dump path required.\n"); 2196 } 2197 #endif 2198 } 2199 2200 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2201 void __user *buffer, size_t *lenp, loff_t *ppos) 2202 { 2203 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2204 if (!error) 2205 validate_coredump_safety(); 2206 return error; 2207 } 2208 2209 #ifdef CONFIG_COREDUMP 2210 static int proc_dostring_coredump(struct ctl_table *table, int write, 2211 void __user *buffer, size_t *lenp, loff_t *ppos) 2212 { 2213 int error = proc_dostring(table, write, buffer, lenp, ppos); 2214 if (!error) 2215 validate_coredump_safety(); 2216 return error; 2217 } 2218 #endif 2219 2220 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2221 void __user *buffer, 2222 size_t *lenp, loff_t *ppos, 2223 unsigned long convmul, 2224 unsigned long convdiv) 2225 { 2226 unsigned long *i, *min, *max; 2227 int vleft, first = 1, err = 0; 2228 unsigned long page = 0; 2229 size_t left; 2230 char *kbuf; 2231 2232 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2233 *lenp = 0; 2234 return 0; 2235 } 2236 2237 i = (unsigned long *) data; 2238 min = (unsigned long *) table->extra1; 2239 max = (unsigned long *) table->extra2; 2240 vleft = table->maxlen / sizeof(unsigned long); 2241 left = *lenp; 2242 2243 if (write) { 2244 if (*ppos) { 2245 switch (sysctl_writes_strict) { 2246 case SYSCTL_WRITES_STRICT: 2247 goto out; 2248 case SYSCTL_WRITES_WARN: 2249 warn_sysctl_write(table); 2250 break; 2251 default: 2252 break; 2253 } 2254 } 2255 2256 if (left > PAGE_SIZE - 1) 2257 left = PAGE_SIZE - 1; 2258 page = __get_free_page(GFP_TEMPORARY); 2259 kbuf = (char *) page; 2260 if (!kbuf) 2261 return -ENOMEM; 2262 if (copy_from_user(kbuf, buffer, left)) { 2263 err = -EFAULT; 2264 goto free; 2265 } 2266 kbuf[left] = 0; 2267 } 2268 2269 for (; left && vleft--; i++, first = 0) { 2270 unsigned long val; 2271 2272 if (write) { 2273 bool neg; 2274 2275 left -= proc_skip_spaces(&kbuf); 2276 2277 err = proc_get_long(&kbuf, &left, &val, &neg, 2278 proc_wspace_sep, 2279 sizeof(proc_wspace_sep), NULL); 2280 if (err) 2281 break; 2282 if (neg) 2283 continue; 2284 if ((min && val < *min) || (max && val > *max)) 2285 continue; 2286 *i = val; 2287 } else { 2288 val = convdiv * (*i) / convmul; 2289 if (!first) { 2290 err = proc_put_char(&buffer, &left, '\t'); 2291 if (err) 2292 break; 2293 } 2294 err = proc_put_long(&buffer, &left, val, false); 2295 if (err) 2296 break; 2297 } 2298 } 2299 2300 if (!write && !first && left && !err) 2301 err = proc_put_char(&buffer, &left, '\n'); 2302 if (write && !err) 2303 left -= proc_skip_spaces(&kbuf); 2304 free: 2305 if (write) { 2306 free_page(page); 2307 if (first) 2308 return err ? : -EINVAL; 2309 } 2310 *lenp -= left; 2311 out: 2312 *ppos += *lenp; 2313 return err; 2314 } 2315 2316 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2317 void __user *buffer, 2318 size_t *lenp, loff_t *ppos, 2319 unsigned long convmul, 2320 unsigned long convdiv) 2321 { 2322 return __do_proc_doulongvec_minmax(table->data, table, write, 2323 buffer, lenp, ppos, convmul, convdiv); 2324 } 2325 2326 /** 2327 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2328 * @table: the sysctl table 2329 * @write: %TRUE if this is a write to the sysctl file 2330 * @buffer: the user buffer 2331 * @lenp: the size of the user buffer 2332 * @ppos: file position 2333 * 2334 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2335 * values from/to the user buffer, treated as an ASCII string. 2336 * 2337 * This routine will ensure the values are within the range specified by 2338 * table->extra1 (min) and table->extra2 (max). 2339 * 2340 * Returns 0 on success. 2341 */ 2342 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2343 void __user *buffer, size_t *lenp, loff_t *ppos) 2344 { 2345 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2346 } 2347 2348 /** 2349 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2350 * @table: the sysctl table 2351 * @write: %TRUE if this is a write to the sysctl file 2352 * @buffer: the user buffer 2353 * @lenp: the size of the user buffer 2354 * @ppos: file position 2355 * 2356 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2357 * values from/to the user buffer, treated as an ASCII string. The values 2358 * are treated as milliseconds, and converted to jiffies when they are stored. 2359 * 2360 * This routine will ensure the values are within the range specified by 2361 * table->extra1 (min) and table->extra2 (max). 2362 * 2363 * Returns 0 on success. 2364 */ 2365 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2366 void __user *buffer, 2367 size_t *lenp, loff_t *ppos) 2368 { 2369 return do_proc_doulongvec_minmax(table, write, buffer, 2370 lenp, ppos, HZ, 1000l); 2371 } 2372 2373 2374 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2375 int *valp, 2376 int write, void *data) 2377 { 2378 if (write) { 2379 if (*lvalp > LONG_MAX / HZ) 2380 return 1; 2381 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2382 } else { 2383 int val = *valp; 2384 unsigned long lval; 2385 if (val < 0) { 2386 *negp = true; 2387 lval = (unsigned long)-val; 2388 } else { 2389 *negp = false; 2390 lval = (unsigned long)val; 2391 } 2392 *lvalp = lval / HZ; 2393 } 2394 return 0; 2395 } 2396 2397 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2398 int *valp, 2399 int write, void *data) 2400 { 2401 if (write) { 2402 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2403 return 1; 2404 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2405 } else { 2406 int val = *valp; 2407 unsigned long lval; 2408 if (val < 0) { 2409 *negp = true; 2410 lval = (unsigned long)-val; 2411 } else { 2412 *negp = false; 2413 lval = (unsigned long)val; 2414 } 2415 *lvalp = jiffies_to_clock_t(lval); 2416 } 2417 return 0; 2418 } 2419 2420 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2421 int *valp, 2422 int write, void *data) 2423 { 2424 if (write) { 2425 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2426 2427 if (jif > INT_MAX) 2428 return 1; 2429 *valp = (int)jif; 2430 } else { 2431 int val = *valp; 2432 unsigned long lval; 2433 if (val < 0) { 2434 *negp = true; 2435 lval = (unsigned long)-val; 2436 } else { 2437 *negp = false; 2438 lval = (unsigned long)val; 2439 } 2440 *lvalp = jiffies_to_msecs(lval); 2441 } 2442 return 0; 2443 } 2444 2445 /** 2446 * proc_dointvec_jiffies - read a vector of integers as seconds 2447 * @table: the sysctl table 2448 * @write: %TRUE if this is a write to the sysctl file 2449 * @buffer: the user buffer 2450 * @lenp: the size of the user buffer 2451 * @ppos: file position 2452 * 2453 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2454 * values from/to the user buffer, treated as an ASCII string. 2455 * The values read are assumed to be in seconds, and are converted into 2456 * jiffies. 2457 * 2458 * Returns 0 on success. 2459 */ 2460 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2461 void __user *buffer, size_t *lenp, loff_t *ppos) 2462 { 2463 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2464 do_proc_dointvec_jiffies_conv,NULL); 2465 } 2466 2467 /** 2468 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2469 * @table: the sysctl table 2470 * @write: %TRUE if this is a write to the sysctl file 2471 * @buffer: the user buffer 2472 * @lenp: the size of the user buffer 2473 * @ppos: pointer to the file position 2474 * 2475 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2476 * values from/to the user buffer, treated as an ASCII string. 2477 * The values read are assumed to be in 1/USER_HZ seconds, and 2478 * are converted into jiffies. 2479 * 2480 * Returns 0 on success. 2481 */ 2482 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2483 void __user *buffer, size_t *lenp, loff_t *ppos) 2484 { 2485 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2486 do_proc_dointvec_userhz_jiffies_conv,NULL); 2487 } 2488 2489 /** 2490 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2491 * @table: the sysctl table 2492 * @write: %TRUE if this is a write to the sysctl file 2493 * @buffer: the user buffer 2494 * @lenp: the size of the user buffer 2495 * @ppos: file position 2496 * @ppos: the current position in the file 2497 * 2498 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2499 * values from/to the user buffer, treated as an ASCII string. 2500 * The values read are assumed to be in 1/1000 seconds, and 2501 * are converted into jiffies. 2502 * 2503 * Returns 0 on success. 2504 */ 2505 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2506 void __user *buffer, size_t *lenp, loff_t *ppos) 2507 { 2508 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2509 do_proc_dointvec_ms_jiffies_conv, NULL); 2510 } 2511 2512 static int proc_do_cad_pid(struct ctl_table *table, int write, 2513 void __user *buffer, size_t *lenp, loff_t *ppos) 2514 { 2515 struct pid *new_pid; 2516 pid_t tmp; 2517 int r; 2518 2519 tmp = pid_vnr(cad_pid); 2520 2521 r = __do_proc_dointvec(&tmp, table, write, buffer, 2522 lenp, ppos, NULL, NULL); 2523 if (r || !write) 2524 return r; 2525 2526 new_pid = find_get_pid(tmp); 2527 if (!new_pid) 2528 return -ESRCH; 2529 2530 put_pid(xchg(&cad_pid, new_pid)); 2531 return 0; 2532 } 2533 2534 /** 2535 * proc_do_large_bitmap - read/write from/to a large bitmap 2536 * @table: the sysctl table 2537 * @write: %TRUE if this is a write to the sysctl file 2538 * @buffer: the user buffer 2539 * @lenp: the size of the user buffer 2540 * @ppos: file position 2541 * 2542 * The bitmap is stored at table->data and the bitmap length (in bits) 2543 * in table->maxlen. 2544 * 2545 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2546 * large bitmaps may be represented in a compact manner. Writing into 2547 * the file will clear the bitmap then update it with the given input. 2548 * 2549 * Returns 0 on success. 2550 */ 2551 int proc_do_large_bitmap(struct ctl_table *table, int write, 2552 void __user *buffer, size_t *lenp, loff_t *ppos) 2553 { 2554 int err = 0; 2555 bool first = 1; 2556 size_t left = *lenp; 2557 unsigned long bitmap_len = table->maxlen; 2558 unsigned long *bitmap = *(unsigned long **) table->data; 2559 unsigned long *tmp_bitmap = NULL; 2560 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2561 2562 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2563 *lenp = 0; 2564 return 0; 2565 } 2566 2567 if (write) { 2568 unsigned long page = 0; 2569 char *kbuf; 2570 2571 if (left > PAGE_SIZE - 1) 2572 left = PAGE_SIZE - 1; 2573 2574 page = __get_free_page(GFP_TEMPORARY); 2575 kbuf = (char *) page; 2576 if (!kbuf) 2577 return -ENOMEM; 2578 if (copy_from_user(kbuf, buffer, left)) { 2579 free_page(page); 2580 return -EFAULT; 2581 } 2582 kbuf[left] = 0; 2583 2584 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2585 GFP_KERNEL); 2586 if (!tmp_bitmap) { 2587 free_page(page); 2588 return -ENOMEM; 2589 } 2590 proc_skip_char(&kbuf, &left, '\n'); 2591 while (!err && left) { 2592 unsigned long val_a, val_b; 2593 bool neg; 2594 2595 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2596 sizeof(tr_a), &c); 2597 if (err) 2598 break; 2599 if (val_a >= bitmap_len || neg) { 2600 err = -EINVAL; 2601 break; 2602 } 2603 2604 val_b = val_a; 2605 if (left) { 2606 kbuf++; 2607 left--; 2608 } 2609 2610 if (c == '-') { 2611 err = proc_get_long(&kbuf, &left, &val_b, 2612 &neg, tr_b, sizeof(tr_b), 2613 &c); 2614 if (err) 2615 break; 2616 if (val_b >= bitmap_len || neg || 2617 val_a > val_b) { 2618 err = -EINVAL; 2619 break; 2620 } 2621 if (left) { 2622 kbuf++; 2623 left--; 2624 } 2625 } 2626 2627 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2628 first = 0; 2629 proc_skip_char(&kbuf, &left, '\n'); 2630 } 2631 free_page(page); 2632 } else { 2633 unsigned long bit_a, bit_b = 0; 2634 2635 while (left) { 2636 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2637 if (bit_a >= bitmap_len) 2638 break; 2639 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2640 bit_a + 1) - 1; 2641 2642 if (!first) { 2643 err = proc_put_char(&buffer, &left, ','); 2644 if (err) 2645 break; 2646 } 2647 err = proc_put_long(&buffer, &left, bit_a, false); 2648 if (err) 2649 break; 2650 if (bit_a != bit_b) { 2651 err = proc_put_char(&buffer, &left, '-'); 2652 if (err) 2653 break; 2654 err = proc_put_long(&buffer, &left, bit_b, false); 2655 if (err) 2656 break; 2657 } 2658 2659 first = 0; bit_b++; 2660 } 2661 if (!err) 2662 err = proc_put_char(&buffer, &left, '\n'); 2663 } 2664 2665 if (!err) { 2666 if (write) { 2667 if (*ppos) 2668 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2669 else 2670 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2671 } 2672 kfree(tmp_bitmap); 2673 *lenp -= left; 2674 *ppos += *lenp; 2675 return 0; 2676 } else { 2677 kfree(tmp_bitmap); 2678 return err; 2679 } 2680 } 2681 2682 #else /* CONFIG_PROC_SYSCTL */ 2683 2684 int proc_dostring(struct ctl_table *table, int write, 2685 void __user *buffer, size_t *lenp, loff_t *ppos) 2686 { 2687 return -ENOSYS; 2688 } 2689 2690 int proc_dointvec(struct ctl_table *table, int write, 2691 void __user *buffer, size_t *lenp, loff_t *ppos) 2692 { 2693 return -ENOSYS; 2694 } 2695 2696 int proc_dointvec_minmax(struct ctl_table *table, int write, 2697 void __user *buffer, size_t *lenp, loff_t *ppos) 2698 { 2699 return -ENOSYS; 2700 } 2701 2702 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2703 void __user *buffer, size_t *lenp, loff_t *ppos) 2704 { 2705 return -ENOSYS; 2706 } 2707 2708 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2709 void __user *buffer, size_t *lenp, loff_t *ppos) 2710 { 2711 return -ENOSYS; 2712 } 2713 2714 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2715 void __user *buffer, size_t *lenp, loff_t *ppos) 2716 { 2717 return -ENOSYS; 2718 } 2719 2720 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2721 void __user *buffer, size_t *lenp, loff_t *ppos) 2722 { 2723 return -ENOSYS; 2724 } 2725 2726 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2727 void __user *buffer, 2728 size_t *lenp, loff_t *ppos) 2729 { 2730 return -ENOSYS; 2731 } 2732 2733 2734 #endif /* CONFIG_PROC_SYSCTL */ 2735 2736 /* 2737 * No sense putting this after each symbol definition, twice, 2738 * exception granted :-) 2739 */ 2740 EXPORT_SYMBOL(proc_dointvec); 2741 EXPORT_SYMBOL(proc_dointvec_jiffies); 2742 EXPORT_SYMBOL(proc_dointvec_minmax); 2743 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2744 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2745 EXPORT_SYMBOL(proc_dostring); 2746 EXPORT_SYMBOL(proc_doulongvec_minmax); 2747 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2748