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