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/aio.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/bitmap.h> 28 #include <linux/signal.h> 29 #include <linux/printk.h> 30 #include <linux/proc_fs.h> 31 #include <linux/security.h> 32 #include <linux/ctype.h> 33 #include <linux/kmemcheck.h> 34 #include <linux/kmemleak.h> 35 #include <linux/fs.h> 36 #include <linux/init.h> 37 #include <linux/kernel.h> 38 #include <linux/kobject.h> 39 #include <linux/net.h> 40 #include <linux/sysrq.h> 41 #include <linux/highuid.h> 42 #include <linux/writeback.h> 43 #include <linux/ratelimit.h> 44 #include <linux/compaction.h> 45 #include <linux/hugetlb.h> 46 #include <linux/initrd.h> 47 #include <linux/key.h> 48 #include <linux/times.h> 49 #include <linux/limits.h> 50 #include <linux/dcache.h> 51 #include <linux/dnotify.h> 52 #include <linux/syscalls.h> 53 #include <linux/vmstat.h> 54 #include <linux/nfs_fs.h> 55 #include <linux/acpi.h> 56 #include <linux/reboot.h> 57 #include <linux/ftrace.h> 58 #include <linux/perf_event.h> 59 #include <linux/kprobes.h> 60 #include <linux/pipe_fs_i.h> 61 #include <linux/oom.h> 62 #include <linux/kmod.h> 63 #include <linux/capability.h> 64 #include <linux/binfmts.h> 65 #include <linux/sched/sysctl.h> 66 #include <linux/sched/coredump.h> 67 #include <linux/kexec.h> 68 #include <linux/bpf.h> 69 #include <linux/mount.h> 70 71 #include <linux/uaccess.h> 72 #include <asm/processor.h> 73 74 #ifdef CONFIG_X86 75 #include <asm/nmi.h> 76 #include <asm/stacktrace.h> 77 #include <asm/io.h> 78 #endif 79 #ifdef CONFIG_SPARC 80 #include <asm/setup.h> 81 #endif 82 #ifdef CONFIG_BSD_PROCESS_ACCT 83 #include <linux/acct.h> 84 #endif 85 #ifdef CONFIG_RT_MUTEXES 86 #include <linux/rtmutex.h> 87 #endif 88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 89 #include <linux/lockdep.h> 90 #endif 91 #ifdef CONFIG_CHR_DEV_SG 92 #include <scsi/sg.h> 93 #endif 94 95 #ifdef CONFIG_LOCKUP_DETECTOR 96 #include <linux/nmi.h> 97 #endif 98 99 #if defined(CONFIG_SYSCTL) 100 101 /* External variables not in a header file. */ 102 extern int suid_dumpable; 103 #ifdef CONFIG_COREDUMP 104 extern int core_uses_pid; 105 extern char core_pattern[]; 106 extern unsigned int core_pipe_limit; 107 #endif 108 extern int pid_max; 109 extern int pid_max_min, pid_max_max; 110 extern int percpu_pagelist_fraction; 111 extern int latencytop_enabled; 112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; 113 #ifndef CONFIG_MMU 114 extern int sysctl_nr_trim_pages; 115 #endif 116 117 /* Constants used for minimum and maximum */ 118 #ifdef CONFIG_LOCKUP_DETECTOR 119 static int sixty = 60; 120 #endif 121 122 static int __maybe_unused neg_one = -1; 123 124 static int zero; 125 static int __maybe_unused one = 1; 126 static int __maybe_unused two = 2; 127 static int __maybe_unused four = 4; 128 static unsigned long one_ul = 1; 129 static int one_hundred = 100; 130 static int one_thousand = 1000; 131 #ifdef CONFIG_PRINTK 132 static int ten_thousand = 10000; 133 #endif 134 #ifdef CONFIG_PERF_EVENTS 135 static int six_hundred_forty_kb = 640 * 1024; 136 #endif 137 138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 140 141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 142 static int maxolduid = 65535; 143 static int minolduid; 144 145 static int ngroups_max = NGROUPS_MAX; 146 static const int cap_last_cap = CAP_LAST_CAP; 147 148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 149 #ifdef CONFIG_DETECT_HUNG_TASK 150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 151 #endif 152 153 #ifdef CONFIG_INOTIFY_USER 154 #include <linux/inotify.h> 155 #endif 156 #ifdef CONFIG_SPARC 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 176 177 #define SYSCTL_WRITES_LEGACY -1 178 #define SYSCTL_WRITES_WARN 0 179 #define SYSCTL_WRITES_STRICT 1 180 181 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT; 182 183 static int proc_do_cad_pid(struct ctl_table *table, int write, 184 void __user *buffer, size_t *lenp, loff_t *ppos); 185 static int proc_taint(struct ctl_table *table, int write, 186 void __user *buffer, size_t *lenp, loff_t *ppos); 187 #endif 188 189 #ifdef CONFIG_PRINTK 190 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 191 void __user *buffer, size_t *lenp, loff_t *ppos); 192 #endif 193 194 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 195 void __user *buffer, size_t *lenp, loff_t *ppos); 196 #ifdef CONFIG_COREDUMP 197 static int proc_dostring_coredump(struct ctl_table *table, int write, 198 void __user *buffer, size_t *lenp, loff_t *ppos); 199 #endif 200 201 #ifdef CONFIG_MAGIC_SYSRQ 202 /* Note: sysrq code uses it's own private copy */ 203 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 204 205 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 206 void __user *buffer, size_t *lenp, 207 loff_t *ppos) 208 { 209 int error; 210 211 error = proc_dointvec(table, write, buffer, lenp, ppos); 212 if (error) 213 return error; 214 215 if (write) 216 sysrq_toggle_support(__sysrq_enabled); 217 218 return 0; 219 } 220 221 #endif 222 223 static struct ctl_table kern_table[]; 224 static struct ctl_table vm_table[]; 225 static struct ctl_table fs_table[]; 226 static struct ctl_table debug_table[]; 227 static struct ctl_table dev_table[]; 228 extern struct ctl_table random_table[]; 229 #ifdef CONFIG_EPOLL 230 extern struct ctl_table epoll_table[]; 231 #endif 232 233 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 234 int sysctl_legacy_va_layout; 235 #endif 236 237 /* The default sysctl tables: */ 238 239 static struct ctl_table sysctl_base_table[] = { 240 { 241 .procname = "kernel", 242 .mode = 0555, 243 .child = kern_table, 244 }, 245 { 246 .procname = "vm", 247 .mode = 0555, 248 .child = vm_table, 249 }, 250 { 251 .procname = "fs", 252 .mode = 0555, 253 .child = fs_table, 254 }, 255 { 256 .procname = "debug", 257 .mode = 0555, 258 .child = debug_table, 259 }, 260 { 261 .procname = "dev", 262 .mode = 0555, 263 .child = dev_table, 264 }, 265 { } 266 }; 267 268 #ifdef CONFIG_SCHED_DEBUG 269 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 270 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 271 static int min_wakeup_granularity_ns; /* 0 usecs */ 272 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 273 #ifdef CONFIG_SMP 274 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 275 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 276 #endif /* CONFIG_SMP */ 277 #endif /* CONFIG_SCHED_DEBUG */ 278 279 #ifdef CONFIG_COMPACTION 280 static int min_extfrag_threshold; 281 static int max_extfrag_threshold = 1000; 282 #endif 283 284 static struct ctl_table kern_table[] = { 285 { 286 .procname = "sched_child_runs_first", 287 .data = &sysctl_sched_child_runs_first, 288 .maxlen = sizeof(unsigned int), 289 .mode = 0644, 290 .proc_handler = proc_dointvec, 291 }, 292 #ifdef CONFIG_SCHED_DEBUG 293 { 294 .procname = "sched_min_granularity_ns", 295 .data = &sysctl_sched_min_granularity, 296 .maxlen = sizeof(unsigned int), 297 .mode = 0644, 298 .proc_handler = sched_proc_update_handler, 299 .extra1 = &min_sched_granularity_ns, 300 .extra2 = &max_sched_granularity_ns, 301 }, 302 { 303 .procname = "sched_latency_ns", 304 .data = &sysctl_sched_latency, 305 .maxlen = sizeof(unsigned int), 306 .mode = 0644, 307 .proc_handler = sched_proc_update_handler, 308 .extra1 = &min_sched_granularity_ns, 309 .extra2 = &max_sched_granularity_ns, 310 }, 311 { 312 .procname = "sched_wakeup_granularity_ns", 313 .data = &sysctl_sched_wakeup_granularity, 314 .maxlen = sizeof(unsigned int), 315 .mode = 0644, 316 .proc_handler = sched_proc_update_handler, 317 .extra1 = &min_wakeup_granularity_ns, 318 .extra2 = &max_wakeup_granularity_ns, 319 }, 320 #ifdef CONFIG_SMP 321 { 322 .procname = "sched_tunable_scaling", 323 .data = &sysctl_sched_tunable_scaling, 324 .maxlen = sizeof(enum sched_tunable_scaling), 325 .mode = 0644, 326 .proc_handler = sched_proc_update_handler, 327 .extra1 = &min_sched_tunable_scaling, 328 .extra2 = &max_sched_tunable_scaling, 329 }, 330 { 331 .procname = "sched_migration_cost_ns", 332 .data = &sysctl_sched_migration_cost, 333 .maxlen = sizeof(unsigned int), 334 .mode = 0644, 335 .proc_handler = proc_dointvec, 336 }, 337 { 338 .procname = "sched_nr_migrate", 339 .data = &sysctl_sched_nr_migrate, 340 .maxlen = sizeof(unsigned int), 341 .mode = 0644, 342 .proc_handler = proc_dointvec, 343 }, 344 { 345 .procname = "sched_time_avg_ms", 346 .data = &sysctl_sched_time_avg, 347 .maxlen = sizeof(unsigned int), 348 .mode = 0644, 349 .proc_handler = proc_dointvec, 350 }, 351 #ifdef CONFIG_SCHEDSTATS 352 { 353 .procname = "sched_schedstats", 354 .data = NULL, 355 .maxlen = sizeof(unsigned int), 356 .mode = 0644, 357 .proc_handler = sysctl_schedstats, 358 .extra1 = &zero, 359 .extra2 = &one, 360 }, 361 #endif /* CONFIG_SCHEDSTATS */ 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_minmax, 391 .extra1 = &one, 392 }, 393 { 394 .procname = "numa_balancing", 395 .data = NULL, /* filled in by handler */ 396 .maxlen = sizeof(unsigned int), 397 .mode = 0644, 398 .proc_handler = sysctl_numa_balancing, 399 .extra1 = &zero, 400 .extra2 = &one, 401 }, 402 #endif /* CONFIG_NUMA_BALANCING */ 403 #endif /* CONFIG_SCHED_DEBUG */ 404 { 405 .procname = "sched_rt_period_us", 406 .data = &sysctl_sched_rt_period, 407 .maxlen = sizeof(unsigned int), 408 .mode = 0644, 409 .proc_handler = sched_rt_handler, 410 }, 411 { 412 .procname = "sched_rt_runtime_us", 413 .data = &sysctl_sched_rt_runtime, 414 .maxlen = sizeof(int), 415 .mode = 0644, 416 .proc_handler = sched_rt_handler, 417 }, 418 { 419 .procname = "sched_rr_timeslice_ms", 420 .data = &sysctl_sched_rr_timeslice, 421 .maxlen = sizeof(int), 422 .mode = 0644, 423 .proc_handler = sched_rr_handler, 424 }, 425 #ifdef CONFIG_SCHED_AUTOGROUP 426 { 427 .procname = "sched_autogroup_enabled", 428 .data = &sysctl_sched_autogroup_enabled, 429 .maxlen = sizeof(unsigned int), 430 .mode = 0644, 431 .proc_handler = proc_dointvec_minmax, 432 .extra1 = &zero, 433 .extra2 = &one, 434 }, 435 #endif 436 #ifdef CONFIG_CFS_BANDWIDTH 437 { 438 .procname = "sched_cfs_bandwidth_slice_us", 439 .data = &sysctl_sched_cfs_bandwidth_slice, 440 .maxlen = sizeof(unsigned int), 441 .mode = 0644, 442 .proc_handler = proc_dointvec_minmax, 443 .extra1 = &one, 444 }, 445 #endif 446 #ifdef CONFIG_PROVE_LOCKING 447 { 448 .procname = "prove_locking", 449 .data = &prove_locking, 450 .maxlen = sizeof(int), 451 .mode = 0644, 452 .proc_handler = proc_dointvec, 453 }, 454 #endif 455 #ifdef CONFIG_LOCK_STAT 456 { 457 .procname = "lock_stat", 458 .data = &lock_stat, 459 .maxlen = sizeof(int), 460 .mode = 0644, 461 .proc_handler = proc_dointvec, 462 }, 463 #endif 464 { 465 .procname = "panic", 466 .data = &panic_timeout, 467 .maxlen = sizeof(int), 468 .mode = 0644, 469 .proc_handler = proc_dointvec, 470 }, 471 #ifdef CONFIG_COREDUMP 472 { 473 .procname = "core_uses_pid", 474 .data = &core_uses_pid, 475 .maxlen = sizeof(int), 476 .mode = 0644, 477 .proc_handler = proc_dointvec, 478 }, 479 { 480 .procname = "core_pattern", 481 .data = core_pattern, 482 .maxlen = CORENAME_MAX_SIZE, 483 .mode = 0644, 484 .proc_handler = proc_dostring_coredump, 485 }, 486 { 487 .procname = "core_pipe_limit", 488 .data = &core_pipe_limit, 489 .maxlen = sizeof(unsigned int), 490 .mode = 0644, 491 .proc_handler = proc_dointvec, 492 }, 493 #endif 494 #ifdef CONFIG_PROC_SYSCTL 495 { 496 .procname = "tainted", 497 .maxlen = sizeof(long), 498 .mode = 0644, 499 .proc_handler = proc_taint, 500 }, 501 { 502 .procname = "sysctl_writes_strict", 503 .data = &sysctl_writes_strict, 504 .maxlen = sizeof(int), 505 .mode = 0644, 506 .proc_handler = proc_dointvec_minmax, 507 .extra1 = &neg_one, 508 .extra2 = &one, 509 }, 510 #endif 511 #ifdef CONFIG_LATENCYTOP 512 { 513 .procname = "latencytop", 514 .data = &latencytop_enabled, 515 .maxlen = sizeof(int), 516 .mode = 0644, 517 .proc_handler = sysctl_latencytop, 518 }, 519 #endif 520 #ifdef CONFIG_BLK_DEV_INITRD 521 { 522 .procname = "real-root-dev", 523 .data = &real_root_dev, 524 .maxlen = sizeof(int), 525 .mode = 0644, 526 .proc_handler = proc_dointvec, 527 }, 528 #endif 529 { 530 .procname = "print-fatal-signals", 531 .data = &print_fatal_signals, 532 .maxlen = sizeof(int), 533 .mode = 0644, 534 .proc_handler = proc_dointvec, 535 }, 536 #ifdef CONFIG_SPARC 537 { 538 .procname = "reboot-cmd", 539 .data = reboot_command, 540 .maxlen = 256, 541 .mode = 0644, 542 .proc_handler = proc_dostring, 543 }, 544 { 545 .procname = "stop-a", 546 .data = &stop_a_enabled, 547 .maxlen = sizeof (int), 548 .mode = 0644, 549 .proc_handler = proc_dointvec, 550 }, 551 { 552 .procname = "scons-poweroff", 553 .data = &scons_pwroff, 554 .maxlen = sizeof (int), 555 .mode = 0644, 556 .proc_handler = proc_dointvec, 557 }, 558 #endif 559 #ifdef CONFIG_SPARC64 560 { 561 .procname = "tsb-ratio", 562 .data = &sysctl_tsb_ratio, 563 .maxlen = sizeof (int), 564 .mode = 0644, 565 .proc_handler = proc_dointvec, 566 }, 567 #endif 568 #ifdef __hppa__ 569 { 570 .procname = "soft-power", 571 .data = &pwrsw_enabled, 572 .maxlen = sizeof (int), 573 .mode = 0644, 574 .proc_handler = proc_dointvec, 575 }, 576 #endif 577 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 578 { 579 .procname = "unaligned-trap", 580 .data = &unaligned_enabled, 581 .maxlen = sizeof (int), 582 .mode = 0644, 583 .proc_handler = proc_dointvec, 584 }, 585 #endif 586 { 587 .procname = "ctrl-alt-del", 588 .data = &C_A_D, 589 .maxlen = sizeof(int), 590 .mode = 0644, 591 .proc_handler = proc_dointvec, 592 }, 593 #ifdef CONFIG_FUNCTION_TRACER 594 { 595 .procname = "ftrace_enabled", 596 .data = &ftrace_enabled, 597 .maxlen = sizeof(int), 598 .mode = 0644, 599 .proc_handler = ftrace_enable_sysctl, 600 }, 601 #endif 602 #ifdef CONFIG_STACK_TRACER 603 { 604 .procname = "stack_tracer_enabled", 605 .data = &stack_tracer_enabled, 606 .maxlen = sizeof(int), 607 .mode = 0644, 608 .proc_handler = stack_trace_sysctl, 609 }, 610 #endif 611 #ifdef CONFIG_TRACING 612 { 613 .procname = "ftrace_dump_on_oops", 614 .data = &ftrace_dump_on_oops, 615 .maxlen = sizeof(int), 616 .mode = 0644, 617 .proc_handler = proc_dointvec, 618 }, 619 { 620 .procname = "traceoff_on_warning", 621 .data = &__disable_trace_on_warning, 622 .maxlen = sizeof(__disable_trace_on_warning), 623 .mode = 0644, 624 .proc_handler = proc_dointvec, 625 }, 626 { 627 .procname = "tracepoint_printk", 628 .data = &tracepoint_printk, 629 .maxlen = sizeof(tracepoint_printk), 630 .mode = 0644, 631 .proc_handler = tracepoint_printk_sysctl, 632 }, 633 #endif 634 #ifdef CONFIG_KEXEC_CORE 635 { 636 .procname = "kexec_load_disabled", 637 .data = &kexec_load_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 #ifdef CONFIG_MODULES 647 { 648 .procname = "modprobe", 649 .data = &modprobe_path, 650 .maxlen = KMOD_PATH_LEN, 651 .mode = 0644, 652 .proc_handler = proc_dostring, 653 }, 654 { 655 .procname = "modules_disabled", 656 .data = &modules_disabled, 657 .maxlen = sizeof(int), 658 .mode = 0644, 659 /* only handle a transition from default "0" to "1" */ 660 .proc_handler = proc_dointvec_minmax, 661 .extra1 = &one, 662 .extra2 = &one, 663 }, 664 #endif 665 #ifdef CONFIG_UEVENT_HELPER 666 { 667 .procname = "hotplug", 668 .data = &uevent_helper, 669 .maxlen = UEVENT_HELPER_PATH_LEN, 670 .mode = 0644, 671 .proc_handler = proc_dostring, 672 }, 673 #endif 674 #ifdef CONFIG_CHR_DEV_SG 675 { 676 .procname = "sg-big-buff", 677 .data = &sg_big_buff, 678 .maxlen = sizeof (int), 679 .mode = 0444, 680 .proc_handler = proc_dointvec, 681 }, 682 #endif 683 #ifdef CONFIG_BSD_PROCESS_ACCT 684 { 685 .procname = "acct", 686 .data = &acct_parm, 687 .maxlen = 3*sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec, 690 }, 691 #endif 692 #ifdef CONFIG_MAGIC_SYSRQ 693 { 694 .procname = "sysrq", 695 .data = &__sysrq_enabled, 696 .maxlen = sizeof (int), 697 .mode = 0644, 698 .proc_handler = sysrq_sysctl_handler, 699 }, 700 #endif 701 #ifdef CONFIG_PROC_SYSCTL 702 { 703 .procname = "cad_pid", 704 .data = NULL, 705 .maxlen = sizeof (int), 706 .mode = 0600, 707 .proc_handler = proc_do_cad_pid, 708 }, 709 #endif 710 { 711 .procname = "threads-max", 712 .data = NULL, 713 .maxlen = sizeof(int), 714 .mode = 0644, 715 .proc_handler = sysctl_max_threads, 716 }, 717 { 718 .procname = "random", 719 .mode = 0555, 720 .child = random_table, 721 }, 722 { 723 .procname = "usermodehelper", 724 .mode = 0555, 725 .child = usermodehelper_table, 726 }, 727 { 728 .procname = "overflowuid", 729 .data = &overflowuid, 730 .maxlen = sizeof(int), 731 .mode = 0644, 732 .proc_handler = proc_dointvec_minmax, 733 .extra1 = &minolduid, 734 .extra2 = &maxolduid, 735 }, 736 { 737 .procname = "overflowgid", 738 .data = &overflowgid, 739 .maxlen = sizeof(int), 740 .mode = 0644, 741 .proc_handler = proc_dointvec_minmax, 742 .extra1 = &minolduid, 743 .extra2 = &maxolduid, 744 }, 745 #ifdef CONFIG_S390 746 #ifdef CONFIG_MATHEMU 747 { 748 .procname = "ieee_emulation_warnings", 749 .data = &sysctl_ieee_emulation_warnings, 750 .maxlen = sizeof(int), 751 .mode = 0644, 752 .proc_handler = proc_dointvec, 753 }, 754 #endif 755 { 756 .procname = "userprocess_debug", 757 .data = &show_unhandled_signals, 758 .maxlen = sizeof(int), 759 .mode = 0644, 760 .proc_handler = proc_dointvec, 761 }, 762 #endif 763 { 764 .procname = "pid_max", 765 .data = &pid_max, 766 .maxlen = sizeof (int), 767 .mode = 0644, 768 .proc_handler = proc_dointvec_minmax, 769 .extra1 = &pid_max_min, 770 .extra2 = &pid_max_max, 771 }, 772 { 773 .procname = "panic_on_oops", 774 .data = &panic_on_oops, 775 .maxlen = sizeof(int), 776 .mode = 0644, 777 .proc_handler = proc_dointvec, 778 }, 779 #if defined CONFIG_PRINTK 780 { 781 .procname = "printk", 782 .data = &console_loglevel, 783 .maxlen = 4*sizeof(int), 784 .mode = 0644, 785 .proc_handler = proc_dointvec, 786 }, 787 { 788 .procname = "printk_ratelimit", 789 .data = &printk_ratelimit_state.interval, 790 .maxlen = sizeof(int), 791 .mode = 0644, 792 .proc_handler = proc_dointvec_jiffies, 793 }, 794 { 795 .procname = "printk_ratelimit_burst", 796 .data = &printk_ratelimit_state.burst, 797 .maxlen = sizeof(int), 798 .mode = 0644, 799 .proc_handler = proc_dointvec, 800 }, 801 { 802 .procname = "printk_delay", 803 .data = &printk_delay_msec, 804 .maxlen = sizeof(int), 805 .mode = 0644, 806 .proc_handler = proc_dointvec_minmax, 807 .extra1 = &zero, 808 .extra2 = &ten_thousand, 809 }, 810 { 811 .procname = "printk_devkmsg", 812 .data = devkmsg_log_str, 813 .maxlen = DEVKMSG_STR_MAX_SIZE, 814 .mode = 0644, 815 .proc_handler = devkmsg_sysctl_set_loglvl, 816 }, 817 { 818 .procname = "dmesg_restrict", 819 .data = &dmesg_restrict, 820 .maxlen = sizeof(int), 821 .mode = 0644, 822 .proc_handler = proc_dointvec_minmax_sysadmin, 823 .extra1 = &zero, 824 .extra2 = &one, 825 }, 826 { 827 .procname = "kptr_restrict", 828 .data = &kptr_restrict, 829 .maxlen = sizeof(int), 830 .mode = 0644, 831 .proc_handler = proc_dointvec_minmax_sysadmin, 832 .extra1 = &zero, 833 .extra2 = &two, 834 }, 835 #endif 836 { 837 .procname = "ngroups_max", 838 .data = &ngroups_max, 839 .maxlen = sizeof (int), 840 .mode = 0444, 841 .proc_handler = proc_dointvec, 842 }, 843 { 844 .procname = "cap_last_cap", 845 .data = (void *)&cap_last_cap, 846 .maxlen = sizeof(int), 847 .mode = 0444, 848 .proc_handler = proc_dointvec, 849 }, 850 #if defined(CONFIG_LOCKUP_DETECTOR) 851 { 852 .procname = "watchdog", 853 .data = &watchdog_user_enabled, 854 .maxlen = sizeof (int), 855 .mode = 0644, 856 .proc_handler = proc_watchdog, 857 .extra1 = &zero, 858 .extra2 = &one, 859 }, 860 { 861 .procname = "watchdog_thresh", 862 .data = &watchdog_thresh, 863 .maxlen = sizeof(int), 864 .mode = 0644, 865 .proc_handler = proc_watchdog_thresh, 866 .extra1 = &zero, 867 .extra2 = &sixty, 868 }, 869 { 870 .procname = "nmi_watchdog", 871 .data = &nmi_watchdog_enabled, 872 .maxlen = sizeof (int), 873 .mode = 0644, 874 .proc_handler = proc_nmi_watchdog, 875 .extra1 = &zero, 876 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) 877 .extra2 = &one, 878 #else 879 .extra2 = &zero, 880 #endif 881 }, 882 { 883 .procname = "soft_watchdog", 884 .data = &soft_watchdog_enabled, 885 .maxlen = sizeof (int), 886 .mode = 0644, 887 .proc_handler = proc_soft_watchdog, 888 .extra1 = &zero, 889 .extra2 = &one, 890 }, 891 { 892 .procname = "watchdog_cpumask", 893 .data = &watchdog_cpumask_bits, 894 .maxlen = NR_CPUS, 895 .mode = 0644, 896 .proc_handler = proc_watchdog_cpumask, 897 }, 898 { 899 .procname = "softlockup_panic", 900 .data = &softlockup_panic, 901 .maxlen = sizeof(int), 902 .mode = 0644, 903 .proc_handler = proc_dointvec_minmax, 904 .extra1 = &zero, 905 .extra2 = &one, 906 }, 907 #ifdef CONFIG_HARDLOCKUP_DETECTOR 908 { 909 .procname = "hardlockup_panic", 910 .data = &hardlockup_panic, 911 .maxlen = sizeof(int), 912 .mode = 0644, 913 .proc_handler = proc_dointvec_minmax, 914 .extra1 = &zero, 915 .extra2 = &one, 916 }, 917 #endif 918 #ifdef CONFIG_SMP 919 { 920 .procname = "softlockup_all_cpu_backtrace", 921 .data = &sysctl_softlockup_all_cpu_backtrace, 922 .maxlen = sizeof(int), 923 .mode = 0644, 924 .proc_handler = proc_dointvec_minmax, 925 .extra1 = &zero, 926 .extra2 = &one, 927 }, 928 { 929 .procname = "hardlockup_all_cpu_backtrace", 930 .data = &sysctl_hardlockup_all_cpu_backtrace, 931 .maxlen = sizeof(int), 932 .mode = 0644, 933 .proc_handler = proc_dointvec_minmax, 934 .extra1 = &zero, 935 .extra2 = &one, 936 }, 937 #endif /* CONFIG_SMP */ 938 #endif 939 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 940 { 941 .procname = "unknown_nmi_panic", 942 .data = &unknown_nmi_panic, 943 .maxlen = sizeof (int), 944 .mode = 0644, 945 .proc_handler = proc_dointvec, 946 }, 947 #endif 948 #if defined(CONFIG_X86) 949 { 950 .procname = "panic_on_unrecovered_nmi", 951 .data = &panic_on_unrecovered_nmi, 952 .maxlen = sizeof(int), 953 .mode = 0644, 954 .proc_handler = proc_dointvec, 955 }, 956 { 957 .procname = "panic_on_io_nmi", 958 .data = &panic_on_io_nmi, 959 .maxlen = sizeof(int), 960 .mode = 0644, 961 .proc_handler = proc_dointvec, 962 }, 963 #ifdef CONFIG_DEBUG_STACKOVERFLOW 964 { 965 .procname = "panic_on_stackoverflow", 966 .data = &sysctl_panic_on_stackoverflow, 967 .maxlen = sizeof(int), 968 .mode = 0644, 969 .proc_handler = proc_dointvec, 970 }, 971 #endif 972 { 973 .procname = "bootloader_type", 974 .data = &bootloader_type, 975 .maxlen = sizeof (int), 976 .mode = 0444, 977 .proc_handler = proc_dointvec, 978 }, 979 { 980 .procname = "bootloader_version", 981 .data = &bootloader_version, 982 .maxlen = sizeof (int), 983 .mode = 0444, 984 .proc_handler = proc_dointvec, 985 }, 986 { 987 .procname = "io_delay_type", 988 .data = &io_delay_type, 989 .maxlen = sizeof(int), 990 .mode = 0644, 991 .proc_handler = proc_dointvec, 992 }, 993 #endif 994 #if defined(CONFIG_MMU) 995 { 996 .procname = "randomize_va_space", 997 .data = &randomize_va_space, 998 .maxlen = sizeof(int), 999 .mode = 0644, 1000 .proc_handler = proc_dointvec, 1001 }, 1002 #endif 1003 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1004 { 1005 .procname = "spin_retry", 1006 .data = &spin_retry, 1007 .maxlen = sizeof (int), 1008 .mode = 0644, 1009 .proc_handler = proc_dointvec, 1010 }, 1011 #endif 1012 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1013 { 1014 .procname = "acpi_video_flags", 1015 .data = &acpi_realmode_flags, 1016 .maxlen = sizeof (unsigned long), 1017 .mode = 0644, 1018 .proc_handler = proc_doulongvec_minmax, 1019 }, 1020 #endif 1021 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1022 { 1023 .procname = "ignore-unaligned-usertrap", 1024 .data = &no_unaligned_warning, 1025 .maxlen = sizeof (int), 1026 .mode = 0644, 1027 .proc_handler = proc_dointvec, 1028 }, 1029 #endif 1030 #ifdef CONFIG_IA64 1031 { 1032 .procname = "unaligned-dump-stack", 1033 .data = &unaligned_dump_stack, 1034 .maxlen = sizeof (int), 1035 .mode = 0644, 1036 .proc_handler = proc_dointvec, 1037 }, 1038 #endif 1039 #ifdef CONFIG_DETECT_HUNG_TASK 1040 { 1041 .procname = "hung_task_panic", 1042 .data = &sysctl_hung_task_panic, 1043 .maxlen = sizeof(int), 1044 .mode = 0644, 1045 .proc_handler = proc_dointvec_minmax, 1046 .extra1 = &zero, 1047 .extra2 = &one, 1048 }, 1049 { 1050 .procname = "hung_task_check_count", 1051 .data = &sysctl_hung_task_check_count, 1052 .maxlen = sizeof(int), 1053 .mode = 0644, 1054 .proc_handler = proc_dointvec_minmax, 1055 .extra1 = &zero, 1056 }, 1057 { 1058 .procname = "hung_task_timeout_secs", 1059 .data = &sysctl_hung_task_timeout_secs, 1060 .maxlen = sizeof(unsigned long), 1061 .mode = 0644, 1062 .proc_handler = proc_dohung_task_timeout_secs, 1063 .extra2 = &hung_task_timeout_max, 1064 }, 1065 { 1066 .procname = "hung_task_warnings", 1067 .data = &sysctl_hung_task_warnings, 1068 .maxlen = sizeof(int), 1069 .mode = 0644, 1070 .proc_handler = proc_dointvec_minmax, 1071 .extra1 = &neg_one, 1072 }, 1073 #endif 1074 #ifdef CONFIG_RT_MUTEXES 1075 { 1076 .procname = "max_lock_depth", 1077 .data = &max_lock_depth, 1078 .maxlen = sizeof(int), 1079 .mode = 0644, 1080 .proc_handler = proc_dointvec, 1081 }, 1082 #endif 1083 { 1084 .procname = "poweroff_cmd", 1085 .data = &poweroff_cmd, 1086 .maxlen = POWEROFF_CMD_PATH_LEN, 1087 .mode = 0644, 1088 .proc_handler = proc_dostring, 1089 }, 1090 #ifdef CONFIG_KEYS 1091 { 1092 .procname = "keys", 1093 .mode = 0555, 1094 .child = key_sysctls, 1095 }, 1096 #endif 1097 #ifdef CONFIG_PERF_EVENTS 1098 /* 1099 * User-space scripts rely on the existence of this file 1100 * as a feature check for perf_events being enabled. 1101 * 1102 * So it's an ABI, do not remove! 1103 */ 1104 { 1105 .procname = "perf_event_paranoid", 1106 .data = &sysctl_perf_event_paranoid, 1107 .maxlen = sizeof(sysctl_perf_event_paranoid), 1108 .mode = 0644, 1109 .proc_handler = proc_dointvec, 1110 }, 1111 { 1112 .procname = "perf_event_mlock_kb", 1113 .data = &sysctl_perf_event_mlock, 1114 .maxlen = sizeof(sysctl_perf_event_mlock), 1115 .mode = 0644, 1116 .proc_handler = proc_dointvec, 1117 }, 1118 { 1119 .procname = "perf_event_max_sample_rate", 1120 .data = &sysctl_perf_event_sample_rate, 1121 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1122 .mode = 0644, 1123 .proc_handler = perf_proc_update_handler, 1124 .extra1 = &one, 1125 }, 1126 { 1127 .procname = "perf_cpu_time_max_percent", 1128 .data = &sysctl_perf_cpu_time_max_percent, 1129 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1130 .mode = 0644, 1131 .proc_handler = perf_cpu_time_max_percent_handler, 1132 .extra1 = &zero, 1133 .extra2 = &one_hundred, 1134 }, 1135 { 1136 .procname = "perf_event_max_stack", 1137 .data = &sysctl_perf_event_max_stack, 1138 .maxlen = sizeof(sysctl_perf_event_max_stack), 1139 .mode = 0644, 1140 .proc_handler = perf_event_max_stack_handler, 1141 .extra1 = &zero, 1142 .extra2 = &six_hundred_forty_kb, 1143 }, 1144 { 1145 .procname = "perf_event_max_contexts_per_stack", 1146 .data = &sysctl_perf_event_max_contexts_per_stack, 1147 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1148 .mode = 0644, 1149 .proc_handler = perf_event_max_stack_handler, 1150 .extra1 = &zero, 1151 .extra2 = &one_thousand, 1152 }, 1153 #endif 1154 #ifdef CONFIG_KMEMCHECK 1155 { 1156 .procname = "kmemcheck", 1157 .data = &kmemcheck_enabled, 1158 .maxlen = sizeof(int), 1159 .mode = 0644, 1160 .proc_handler = proc_dointvec, 1161 }, 1162 #endif 1163 { 1164 .procname = "panic_on_warn", 1165 .data = &panic_on_warn, 1166 .maxlen = sizeof(int), 1167 .mode = 0644, 1168 .proc_handler = proc_dointvec_minmax, 1169 .extra1 = &zero, 1170 .extra2 = &one, 1171 }, 1172 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1173 { 1174 .procname = "timer_migration", 1175 .data = &sysctl_timer_migration, 1176 .maxlen = sizeof(unsigned int), 1177 .mode = 0644, 1178 .proc_handler = timer_migration_handler, 1179 }, 1180 #endif 1181 #ifdef CONFIG_BPF_SYSCALL 1182 { 1183 .procname = "unprivileged_bpf_disabled", 1184 .data = &sysctl_unprivileged_bpf_disabled, 1185 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1186 .mode = 0644, 1187 /* only handle a transition from default "0" to "1" */ 1188 .proc_handler = proc_dointvec_minmax, 1189 .extra1 = &one, 1190 .extra2 = &one, 1191 }, 1192 #endif 1193 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1194 { 1195 .procname = "panic_on_rcu_stall", 1196 .data = &sysctl_panic_on_rcu_stall, 1197 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1198 .mode = 0644, 1199 .proc_handler = proc_dointvec_minmax, 1200 .extra1 = &zero, 1201 .extra2 = &one, 1202 }, 1203 #endif 1204 { } 1205 }; 1206 1207 static struct ctl_table vm_table[] = { 1208 { 1209 .procname = "overcommit_memory", 1210 .data = &sysctl_overcommit_memory, 1211 .maxlen = sizeof(sysctl_overcommit_memory), 1212 .mode = 0644, 1213 .proc_handler = proc_dointvec_minmax, 1214 .extra1 = &zero, 1215 .extra2 = &two, 1216 }, 1217 { 1218 .procname = "panic_on_oom", 1219 .data = &sysctl_panic_on_oom, 1220 .maxlen = sizeof(sysctl_panic_on_oom), 1221 .mode = 0644, 1222 .proc_handler = proc_dointvec_minmax, 1223 .extra1 = &zero, 1224 .extra2 = &two, 1225 }, 1226 { 1227 .procname = "oom_kill_allocating_task", 1228 .data = &sysctl_oom_kill_allocating_task, 1229 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1230 .mode = 0644, 1231 .proc_handler = proc_dointvec, 1232 }, 1233 { 1234 .procname = "oom_dump_tasks", 1235 .data = &sysctl_oom_dump_tasks, 1236 .maxlen = sizeof(sysctl_oom_dump_tasks), 1237 .mode = 0644, 1238 .proc_handler = proc_dointvec, 1239 }, 1240 { 1241 .procname = "overcommit_ratio", 1242 .data = &sysctl_overcommit_ratio, 1243 .maxlen = sizeof(sysctl_overcommit_ratio), 1244 .mode = 0644, 1245 .proc_handler = overcommit_ratio_handler, 1246 }, 1247 { 1248 .procname = "overcommit_kbytes", 1249 .data = &sysctl_overcommit_kbytes, 1250 .maxlen = sizeof(sysctl_overcommit_kbytes), 1251 .mode = 0644, 1252 .proc_handler = overcommit_kbytes_handler, 1253 }, 1254 { 1255 .procname = "page-cluster", 1256 .data = &page_cluster, 1257 .maxlen = sizeof(int), 1258 .mode = 0644, 1259 .proc_handler = proc_dointvec_minmax, 1260 .extra1 = &zero, 1261 }, 1262 { 1263 .procname = "dirty_background_ratio", 1264 .data = &dirty_background_ratio, 1265 .maxlen = sizeof(dirty_background_ratio), 1266 .mode = 0644, 1267 .proc_handler = dirty_background_ratio_handler, 1268 .extra1 = &zero, 1269 .extra2 = &one_hundred, 1270 }, 1271 { 1272 .procname = "dirty_background_bytes", 1273 .data = &dirty_background_bytes, 1274 .maxlen = sizeof(dirty_background_bytes), 1275 .mode = 0644, 1276 .proc_handler = dirty_background_bytes_handler, 1277 .extra1 = &one_ul, 1278 }, 1279 { 1280 .procname = "dirty_ratio", 1281 .data = &vm_dirty_ratio, 1282 .maxlen = sizeof(vm_dirty_ratio), 1283 .mode = 0644, 1284 .proc_handler = dirty_ratio_handler, 1285 .extra1 = &zero, 1286 .extra2 = &one_hundred, 1287 }, 1288 { 1289 .procname = "dirty_bytes", 1290 .data = &vm_dirty_bytes, 1291 .maxlen = sizeof(vm_dirty_bytes), 1292 .mode = 0644, 1293 .proc_handler = dirty_bytes_handler, 1294 .extra1 = &dirty_bytes_min, 1295 }, 1296 { 1297 .procname = "dirty_writeback_centisecs", 1298 .data = &dirty_writeback_interval, 1299 .maxlen = sizeof(dirty_writeback_interval), 1300 .mode = 0644, 1301 .proc_handler = dirty_writeback_centisecs_handler, 1302 }, 1303 { 1304 .procname = "dirty_expire_centisecs", 1305 .data = &dirty_expire_interval, 1306 .maxlen = sizeof(dirty_expire_interval), 1307 .mode = 0644, 1308 .proc_handler = proc_dointvec_minmax, 1309 .extra1 = &zero, 1310 }, 1311 { 1312 .procname = "dirtytime_expire_seconds", 1313 .data = &dirtytime_expire_interval, 1314 .maxlen = sizeof(dirty_expire_interval), 1315 .mode = 0644, 1316 .proc_handler = dirtytime_interval_handler, 1317 .extra1 = &zero, 1318 }, 1319 { 1320 .procname = "nr_pdflush_threads", 1321 .mode = 0444 /* read-only */, 1322 .proc_handler = pdflush_proc_obsolete, 1323 }, 1324 { 1325 .procname = "swappiness", 1326 .data = &vm_swappiness, 1327 .maxlen = sizeof(vm_swappiness), 1328 .mode = 0644, 1329 .proc_handler = proc_dointvec_minmax, 1330 .extra1 = &zero, 1331 .extra2 = &one_hundred, 1332 }, 1333 #ifdef CONFIG_HUGETLB_PAGE 1334 { 1335 .procname = "nr_hugepages", 1336 .data = NULL, 1337 .maxlen = sizeof(unsigned long), 1338 .mode = 0644, 1339 .proc_handler = hugetlb_sysctl_handler, 1340 }, 1341 #ifdef CONFIG_NUMA 1342 { 1343 .procname = "nr_hugepages_mempolicy", 1344 .data = NULL, 1345 .maxlen = sizeof(unsigned long), 1346 .mode = 0644, 1347 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1348 }, 1349 #endif 1350 { 1351 .procname = "hugetlb_shm_group", 1352 .data = &sysctl_hugetlb_shm_group, 1353 .maxlen = sizeof(gid_t), 1354 .mode = 0644, 1355 .proc_handler = proc_dointvec, 1356 }, 1357 { 1358 .procname = "hugepages_treat_as_movable", 1359 .data = &hugepages_treat_as_movable, 1360 .maxlen = sizeof(int), 1361 .mode = 0644, 1362 .proc_handler = proc_dointvec, 1363 }, 1364 { 1365 .procname = "nr_overcommit_hugepages", 1366 .data = NULL, 1367 .maxlen = sizeof(unsigned long), 1368 .mode = 0644, 1369 .proc_handler = hugetlb_overcommit_handler, 1370 }, 1371 #endif 1372 { 1373 .procname = "lowmem_reserve_ratio", 1374 .data = &sysctl_lowmem_reserve_ratio, 1375 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1376 .mode = 0644, 1377 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1378 }, 1379 { 1380 .procname = "drop_caches", 1381 .data = &sysctl_drop_caches, 1382 .maxlen = sizeof(int), 1383 .mode = 0644, 1384 .proc_handler = drop_caches_sysctl_handler, 1385 .extra1 = &one, 1386 .extra2 = &four, 1387 }, 1388 #ifdef CONFIG_COMPACTION 1389 { 1390 .procname = "compact_memory", 1391 .data = &sysctl_compact_memory, 1392 .maxlen = sizeof(int), 1393 .mode = 0200, 1394 .proc_handler = sysctl_compaction_handler, 1395 }, 1396 { 1397 .procname = "extfrag_threshold", 1398 .data = &sysctl_extfrag_threshold, 1399 .maxlen = sizeof(int), 1400 .mode = 0644, 1401 .proc_handler = sysctl_extfrag_handler, 1402 .extra1 = &min_extfrag_threshold, 1403 .extra2 = &max_extfrag_threshold, 1404 }, 1405 { 1406 .procname = "compact_unevictable_allowed", 1407 .data = &sysctl_compact_unevictable_allowed, 1408 .maxlen = sizeof(int), 1409 .mode = 0644, 1410 .proc_handler = proc_dointvec, 1411 .extra1 = &zero, 1412 .extra2 = &one, 1413 }, 1414 1415 #endif /* CONFIG_COMPACTION */ 1416 { 1417 .procname = "min_free_kbytes", 1418 .data = &min_free_kbytes, 1419 .maxlen = sizeof(min_free_kbytes), 1420 .mode = 0644, 1421 .proc_handler = min_free_kbytes_sysctl_handler, 1422 .extra1 = &zero, 1423 }, 1424 { 1425 .procname = "watermark_scale_factor", 1426 .data = &watermark_scale_factor, 1427 .maxlen = sizeof(watermark_scale_factor), 1428 .mode = 0644, 1429 .proc_handler = watermark_scale_factor_sysctl_handler, 1430 .extra1 = &one, 1431 .extra2 = &one_thousand, 1432 }, 1433 { 1434 .procname = "percpu_pagelist_fraction", 1435 .data = &percpu_pagelist_fraction, 1436 .maxlen = sizeof(percpu_pagelist_fraction), 1437 .mode = 0644, 1438 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1439 .extra1 = &zero, 1440 }, 1441 #ifdef CONFIG_MMU 1442 { 1443 .procname = "max_map_count", 1444 .data = &sysctl_max_map_count, 1445 .maxlen = sizeof(sysctl_max_map_count), 1446 .mode = 0644, 1447 .proc_handler = proc_dointvec_minmax, 1448 .extra1 = &zero, 1449 }, 1450 #else 1451 { 1452 .procname = "nr_trim_pages", 1453 .data = &sysctl_nr_trim_pages, 1454 .maxlen = sizeof(sysctl_nr_trim_pages), 1455 .mode = 0644, 1456 .proc_handler = proc_dointvec_minmax, 1457 .extra1 = &zero, 1458 }, 1459 #endif 1460 { 1461 .procname = "laptop_mode", 1462 .data = &laptop_mode, 1463 .maxlen = sizeof(laptop_mode), 1464 .mode = 0644, 1465 .proc_handler = proc_dointvec_jiffies, 1466 }, 1467 { 1468 .procname = "block_dump", 1469 .data = &block_dump, 1470 .maxlen = sizeof(block_dump), 1471 .mode = 0644, 1472 .proc_handler = proc_dointvec, 1473 .extra1 = &zero, 1474 }, 1475 { 1476 .procname = "vfs_cache_pressure", 1477 .data = &sysctl_vfs_cache_pressure, 1478 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1479 .mode = 0644, 1480 .proc_handler = proc_dointvec, 1481 .extra1 = &zero, 1482 }, 1483 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1484 { 1485 .procname = "legacy_va_layout", 1486 .data = &sysctl_legacy_va_layout, 1487 .maxlen = sizeof(sysctl_legacy_va_layout), 1488 .mode = 0644, 1489 .proc_handler = proc_dointvec, 1490 .extra1 = &zero, 1491 }, 1492 #endif 1493 #ifdef CONFIG_NUMA 1494 { 1495 .procname = "zone_reclaim_mode", 1496 .data = &node_reclaim_mode, 1497 .maxlen = sizeof(node_reclaim_mode), 1498 .mode = 0644, 1499 .proc_handler = proc_dointvec, 1500 .extra1 = &zero, 1501 }, 1502 { 1503 .procname = "min_unmapped_ratio", 1504 .data = &sysctl_min_unmapped_ratio, 1505 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1506 .mode = 0644, 1507 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1508 .extra1 = &zero, 1509 .extra2 = &one_hundred, 1510 }, 1511 { 1512 .procname = "min_slab_ratio", 1513 .data = &sysctl_min_slab_ratio, 1514 .maxlen = sizeof(sysctl_min_slab_ratio), 1515 .mode = 0644, 1516 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1517 .extra1 = &zero, 1518 .extra2 = &one_hundred, 1519 }, 1520 #endif 1521 #ifdef CONFIG_SMP 1522 { 1523 .procname = "stat_interval", 1524 .data = &sysctl_stat_interval, 1525 .maxlen = sizeof(sysctl_stat_interval), 1526 .mode = 0644, 1527 .proc_handler = proc_dointvec_jiffies, 1528 }, 1529 { 1530 .procname = "stat_refresh", 1531 .data = NULL, 1532 .maxlen = 0, 1533 .mode = 0600, 1534 .proc_handler = vmstat_refresh, 1535 }, 1536 #endif 1537 #ifdef CONFIG_MMU 1538 { 1539 .procname = "mmap_min_addr", 1540 .data = &dac_mmap_min_addr, 1541 .maxlen = sizeof(unsigned long), 1542 .mode = 0644, 1543 .proc_handler = mmap_min_addr_handler, 1544 }, 1545 #endif 1546 #ifdef CONFIG_NUMA 1547 { 1548 .procname = "numa_zonelist_order", 1549 .data = &numa_zonelist_order, 1550 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1551 .mode = 0644, 1552 .proc_handler = numa_zonelist_order_handler, 1553 }, 1554 #endif 1555 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1556 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1557 { 1558 .procname = "vdso_enabled", 1559 #ifdef CONFIG_X86_32 1560 .data = &vdso32_enabled, 1561 .maxlen = sizeof(vdso32_enabled), 1562 #else 1563 .data = &vdso_enabled, 1564 .maxlen = sizeof(vdso_enabled), 1565 #endif 1566 .mode = 0644, 1567 .proc_handler = proc_dointvec, 1568 .extra1 = &zero, 1569 }, 1570 #endif 1571 #ifdef CONFIG_HIGHMEM 1572 { 1573 .procname = "highmem_is_dirtyable", 1574 .data = &vm_highmem_is_dirtyable, 1575 .maxlen = sizeof(vm_highmem_is_dirtyable), 1576 .mode = 0644, 1577 .proc_handler = proc_dointvec_minmax, 1578 .extra1 = &zero, 1579 .extra2 = &one, 1580 }, 1581 #endif 1582 #ifdef CONFIG_MEMORY_FAILURE 1583 { 1584 .procname = "memory_failure_early_kill", 1585 .data = &sysctl_memory_failure_early_kill, 1586 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1587 .mode = 0644, 1588 .proc_handler = proc_dointvec_minmax, 1589 .extra1 = &zero, 1590 .extra2 = &one, 1591 }, 1592 { 1593 .procname = "memory_failure_recovery", 1594 .data = &sysctl_memory_failure_recovery, 1595 .maxlen = sizeof(sysctl_memory_failure_recovery), 1596 .mode = 0644, 1597 .proc_handler = proc_dointvec_minmax, 1598 .extra1 = &zero, 1599 .extra2 = &one, 1600 }, 1601 #endif 1602 { 1603 .procname = "user_reserve_kbytes", 1604 .data = &sysctl_user_reserve_kbytes, 1605 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1606 .mode = 0644, 1607 .proc_handler = proc_doulongvec_minmax, 1608 }, 1609 { 1610 .procname = "admin_reserve_kbytes", 1611 .data = &sysctl_admin_reserve_kbytes, 1612 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1613 .mode = 0644, 1614 .proc_handler = proc_doulongvec_minmax, 1615 }, 1616 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1617 { 1618 .procname = "mmap_rnd_bits", 1619 .data = &mmap_rnd_bits, 1620 .maxlen = sizeof(mmap_rnd_bits), 1621 .mode = 0600, 1622 .proc_handler = proc_dointvec_minmax, 1623 .extra1 = (void *)&mmap_rnd_bits_min, 1624 .extra2 = (void *)&mmap_rnd_bits_max, 1625 }, 1626 #endif 1627 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1628 { 1629 .procname = "mmap_rnd_compat_bits", 1630 .data = &mmap_rnd_compat_bits, 1631 .maxlen = sizeof(mmap_rnd_compat_bits), 1632 .mode = 0600, 1633 .proc_handler = proc_dointvec_minmax, 1634 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1635 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1636 }, 1637 #endif 1638 { } 1639 }; 1640 1641 static struct ctl_table fs_table[] = { 1642 { 1643 .procname = "inode-nr", 1644 .data = &inodes_stat, 1645 .maxlen = 2*sizeof(long), 1646 .mode = 0444, 1647 .proc_handler = proc_nr_inodes, 1648 }, 1649 { 1650 .procname = "inode-state", 1651 .data = &inodes_stat, 1652 .maxlen = 7*sizeof(long), 1653 .mode = 0444, 1654 .proc_handler = proc_nr_inodes, 1655 }, 1656 { 1657 .procname = "file-nr", 1658 .data = &files_stat, 1659 .maxlen = sizeof(files_stat), 1660 .mode = 0444, 1661 .proc_handler = proc_nr_files, 1662 }, 1663 { 1664 .procname = "file-max", 1665 .data = &files_stat.max_files, 1666 .maxlen = sizeof(files_stat.max_files), 1667 .mode = 0644, 1668 .proc_handler = proc_doulongvec_minmax, 1669 }, 1670 { 1671 .procname = "nr_open", 1672 .data = &sysctl_nr_open, 1673 .maxlen = sizeof(unsigned int), 1674 .mode = 0644, 1675 .proc_handler = proc_dointvec_minmax, 1676 .extra1 = &sysctl_nr_open_min, 1677 .extra2 = &sysctl_nr_open_max, 1678 }, 1679 { 1680 .procname = "dentry-state", 1681 .data = &dentry_stat, 1682 .maxlen = 6*sizeof(long), 1683 .mode = 0444, 1684 .proc_handler = proc_nr_dentry, 1685 }, 1686 { 1687 .procname = "overflowuid", 1688 .data = &fs_overflowuid, 1689 .maxlen = sizeof(int), 1690 .mode = 0644, 1691 .proc_handler = proc_dointvec_minmax, 1692 .extra1 = &minolduid, 1693 .extra2 = &maxolduid, 1694 }, 1695 { 1696 .procname = "overflowgid", 1697 .data = &fs_overflowgid, 1698 .maxlen = sizeof(int), 1699 .mode = 0644, 1700 .proc_handler = proc_dointvec_minmax, 1701 .extra1 = &minolduid, 1702 .extra2 = &maxolduid, 1703 }, 1704 #ifdef CONFIG_FILE_LOCKING 1705 { 1706 .procname = "leases-enable", 1707 .data = &leases_enable, 1708 .maxlen = sizeof(int), 1709 .mode = 0644, 1710 .proc_handler = proc_dointvec, 1711 }, 1712 #endif 1713 #ifdef CONFIG_DNOTIFY 1714 { 1715 .procname = "dir-notify-enable", 1716 .data = &dir_notify_enable, 1717 .maxlen = sizeof(int), 1718 .mode = 0644, 1719 .proc_handler = proc_dointvec, 1720 }, 1721 #endif 1722 #ifdef CONFIG_MMU 1723 #ifdef CONFIG_FILE_LOCKING 1724 { 1725 .procname = "lease-break-time", 1726 .data = &lease_break_time, 1727 .maxlen = sizeof(int), 1728 .mode = 0644, 1729 .proc_handler = proc_dointvec, 1730 }, 1731 #endif 1732 #ifdef CONFIG_AIO 1733 { 1734 .procname = "aio-nr", 1735 .data = &aio_nr, 1736 .maxlen = sizeof(aio_nr), 1737 .mode = 0444, 1738 .proc_handler = proc_doulongvec_minmax, 1739 }, 1740 { 1741 .procname = "aio-max-nr", 1742 .data = &aio_max_nr, 1743 .maxlen = sizeof(aio_max_nr), 1744 .mode = 0644, 1745 .proc_handler = proc_doulongvec_minmax, 1746 }, 1747 #endif /* CONFIG_AIO */ 1748 #ifdef CONFIG_INOTIFY_USER 1749 { 1750 .procname = "inotify", 1751 .mode = 0555, 1752 .child = inotify_table, 1753 }, 1754 #endif 1755 #ifdef CONFIG_EPOLL 1756 { 1757 .procname = "epoll", 1758 .mode = 0555, 1759 .child = epoll_table, 1760 }, 1761 #endif 1762 #endif 1763 { 1764 .procname = "protected_symlinks", 1765 .data = &sysctl_protected_symlinks, 1766 .maxlen = sizeof(int), 1767 .mode = 0600, 1768 .proc_handler = proc_dointvec_minmax, 1769 .extra1 = &zero, 1770 .extra2 = &one, 1771 }, 1772 { 1773 .procname = "protected_hardlinks", 1774 .data = &sysctl_protected_hardlinks, 1775 .maxlen = sizeof(int), 1776 .mode = 0600, 1777 .proc_handler = proc_dointvec_minmax, 1778 .extra1 = &zero, 1779 .extra2 = &one, 1780 }, 1781 { 1782 .procname = "suid_dumpable", 1783 .data = &suid_dumpable, 1784 .maxlen = sizeof(int), 1785 .mode = 0644, 1786 .proc_handler = proc_dointvec_minmax_coredump, 1787 .extra1 = &zero, 1788 .extra2 = &two, 1789 }, 1790 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1791 { 1792 .procname = "binfmt_misc", 1793 .mode = 0555, 1794 .child = sysctl_mount_point, 1795 }, 1796 #endif 1797 { 1798 .procname = "pipe-max-size", 1799 .data = &pipe_max_size, 1800 .maxlen = sizeof(int), 1801 .mode = 0644, 1802 .proc_handler = &pipe_proc_fn, 1803 .extra1 = &pipe_min_size, 1804 }, 1805 { 1806 .procname = "pipe-user-pages-hard", 1807 .data = &pipe_user_pages_hard, 1808 .maxlen = sizeof(pipe_user_pages_hard), 1809 .mode = 0644, 1810 .proc_handler = proc_doulongvec_minmax, 1811 }, 1812 { 1813 .procname = "pipe-user-pages-soft", 1814 .data = &pipe_user_pages_soft, 1815 .maxlen = sizeof(pipe_user_pages_soft), 1816 .mode = 0644, 1817 .proc_handler = proc_doulongvec_minmax, 1818 }, 1819 { 1820 .procname = "mount-max", 1821 .data = &sysctl_mount_max, 1822 .maxlen = sizeof(unsigned int), 1823 .mode = 0644, 1824 .proc_handler = proc_dointvec_minmax, 1825 .extra1 = &one, 1826 }, 1827 { } 1828 }; 1829 1830 static struct ctl_table debug_table[] = { 1831 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1832 { 1833 .procname = "exception-trace", 1834 .data = &show_unhandled_signals, 1835 .maxlen = sizeof(int), 1836 .mode = 0644, 1837 .proc_handler = proc_dointvec 1838 }, 1839 #endif 1840 #if defined(CONFIG_OPTPROBES) 1841 { 1842 .procname = "kprobes-optimization", 1843 .data = &sysctl_kprobes_optimization, 1844 .maxlen = sizeof(int), 1845 .mode = 0644, 1846 .proc_handler = proc_kprobes_optimization_handler, 1847 .extra1 = &zero, 1848 .extra2 = &one, 1849 }, 1850 #endif 1851 { } 1852 }; 1853 1854 static struct ctl_table dev_table[] = { 1855 { } 1856 }; 1857 1858 int __init sysctl_init(void) 1859 { 1860 struct ctl_table_header *hdr; 1861 1862 hdr = register_sysctl_table(sysctl_base_table); 1863 kmemleak_not_leak(hdr); 1864 return 0; 1865 } 1866 1867 #endif /* CONFIG_SYSCTL */ 1868 1869 /* 1870 * /proc/sys support 1871 */ 1872 1873 #ifdef CONFIG_PROC_SYSCTL 1874 1875 static int _proc_do_string(char *data, int maxlen, int write, 1876 char __user *buffer, 1877 size_t *lenp, loff_t *ppos) 1878 { 1879 size_t len; 1880 char __user *p; 1881 char c; 1882 1883 if (!data || !maxlen || !*lenp) { 1884 *lenp = 0; 1885 return 0; 1886 } 1887 1888 if (write) { 1889 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1890 /* Only continue writes not past the end of buffer. */ 1891 len = strlen(data); 1892 if (len > maxlen - 1) 1893 len = maxlen - 1; 1894 1895 if (*ppos > len) 1896 return 0; 1897 len = *ppos; 1898 } else { 1899 /* Start writing from beginning of buffer. */ 1900 len = 0; 1901 } 1902 1903 *ppos += *lenp; 1904 p = buffer; 1905 while ((p - buffer) < *lenp && len < maxlen - 1) { 1906 if (get_user(c, p++)) 1907 return -EFAULT; 1908 if (c == 0 || c == '\n') 1909 break; 1910 data[len++] = c; 1911 } 1912 data[len] = 0; 1913 } else { 1914 len = strlen(data); 1915 if (len > maxlen) 1916 len = maxlen; 1917 1918 if (*ppos > len) { 1919 *lenp = 0; 1920 return 0; 1921 } 1922 1923 data += *ppos; 1924 len -= *ppos; 1925 1926 if (len > *lenp) 1927 len = *lenp; 1928 if (len) 1929 if (copy_to_user(buffer, data, len)) 1930 return -EFAULT; 1931 if (len < *lenp) { 1932 if (put_user('\n', buffer + len)) 1933 return -EFAULT; 1934 len++; 1935 } 1936 *lenp = len; 1937 *ppos += len; 1938 } 1939 return 0; 1940 } 1941 1942 static void warn_sysctl_write(struct ctl_table *table) 1943 { 1944 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1945 "This will not be supported in the future. To silence this\n" 1946 "warning, set kernel.sysctl_writes_strict = -1\n", 1947 current->comm, table->procname); 1948 } 1949 1950 /** 1951 * proc_dostring - read a string sysctl 1952 * @table: the sysctl table 1953 * @write: %TRUE if this is a write to the sysctl file 1954 * @buffer: the user buffer 1955 * @lenp: the size of the user buffer 1956 * @ppos: file position 1957 * 1958 * Reads/writes a string from/to the user buffer. If the kernel 1959 * buffer provided is not large enough to hold the string, the 1960 * string is truncated. The copied string is %NULL-terminated. 1961 * If the string is being read by the user process, it is copied 1962 * and a newline '\n' is added. It is truncated if the buffer is 1963 * not large enough. 1964 * 1965 * Returns 0 on success. 1966 */ 1967 int proc_dostring(struct ctl_table *table, int write, 1968 void __user *buffer, size_t *lenp, loff_t *ppos) 1969 { 1970 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1971 warn_sysctl_write(table); 1972 1973 return _proc_do_string((char *)(table->data), table->maxlen, write, 1974 (char __user *)buffer, lenp, ppos); 1975 } 1976 1977 static size_t proc_skip_spaces(char **buf) 1978 { 1979 size_t ret; 1980 char *tmp = skip_spaces(*buf); 1981 ret = tmp - *buf; 1982 *buf = tmp; 1983 return ret; 1984 } 1985 1986 static void proc_skip_char(char **buf, size_t *size, const char v) 1987 { 1988 while (*size) { 1989 if (**buf != v) 1990 break; 1991 (*size)--; 1992 (*buf)++; 1993 } 1994 } 1995 1996 #define TMPBUFLEN 22 1997 /** 1998 * proc_get_long - reads an ASCII formatted integer from a user buffer 1999 * 2000 * @buf: a kernel buffer 2001 * @size: size of the kernel buffer 2002 * @val: this is where the number will be stored 2003 * @neg: set to %TRUE if number is negative 2004 * @perm_tr: a vector which contains the allowed trailers 2005 * @perm_tr_len: size of the perm_tr vector 2006 * @tr: pointer to store the trailer character 2007 * 2008 * In case of success %0 is returned and @buf and @size are updated with 2009 * the amount of bytes read. If @tr is non-NULL and a trailing 2010 * character exists (size is non-zero after returning from this 2011 * function), @tr is updated with the trailing character. 2012 */ 2013 static int proc_get_long(char **buf, size_t *size, 2014 unsigned long *val, bool *neg, 2015 const char *perm_tr, unsigned perm_tr_len, char *tr) 2016 { 2017 int len; 2018 char *p, tmp[TMPBUFLEN]; 2019 2020 if (!*size) 2021 return -EINVAL; 2022 2023 len = *size; 2024 if (len > TMPBUFLEN - 1) 2025 len = TMPBUFLEN - 1; 2026 2027 memcpy(tmp, *buf, len); 2028 2029 tmp[len] = 0; 2030 p = tmp; 2031 if (*p == '-' && *size > 1) { 2032 *neg = true; 2033 p++; 2034 } else 2035 *neg = false; 2036 if (!isdigit(*p)) 2037 return -EINVAL; 2038 2039 *val = simple_strtoul(p, &p, 0); 2040 2041 len = p - tmp; 2042 2043 /* We don't know if the next char is whitespace thus we may accept 2044 * invalid integers (e.g. 1234...a) or two integers instead of one 2045 * (e.g. 123...1). So lets not allow such large numbers. */ 2046 if (len == TMPBUFLEN - 1) 2047 return -EINVAL; 2048 2049 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2050 return -EINVAL; 2051 2052 if (tr && (len < *size)) 2053 *tr = *p; 2054 2055 *buf += len; 2056 *size -= len; 2057 2058 return 0; 2059 } 2060 2061 /** 2062 * proc_put_long - converts an integer to a decimal ASCII formatted string 2063 * 2064 * @buf: the user buffer 2065 * @size: the size of the user buffer 2066 * @val: the integer to be converted 2067 * @neg: sign of the number, %TRUE for negative 2068 * 2069 * In case of success %0 is returned and @buf and @size are updated with 2070 * the amount of bytes written. 2071 */ 2072 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2073 bool neg) 2074 { 2075 int len; 2076 char tmp[TMPBUFLEN], *p = tmp; 2077 2078 sprintf(p, "%s%lu", neg ? "-" : "", val); 2079 len = strlen(tmp); 2080 if (len > *size) 2081 len = *size; 2082 if (copy_to_user(*buf, tmp, len)) 2083 return -EFAULT; 2084 *size -= len; 2085 *buf += len; 2086 return 0; 2087 } 2088 #undef TMPBUFLEN 2089 2090 static int proc_put_char(void __user **buf, size_t *size, char c) 2091 { 2092 if (*size) { 2093 char __user **buffer = (char __user **)buf; 2094 if (put_user(c, *buffer)) 2095 return -EFAULT; 2096 (*size)--, (*buffer)++; 2097 *buf = *buffer; 2098 } 2099 return 0; 2100 } 2101 2102 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2103 int *valp, 2104 int write, void *data) 2105 { 2106 if (write) { 2107 if (*negp) { 2108 if (*lvalp > (unsigned long) INT_MAX + 1) 2109 return -EINVAL; 2110 *valp = -*lvalp; 2111 } else { 2112 if (*lvalp > (unsigned long) INT_MAX) 2113 return -EINVAL; 2114 *valp = *lvalp; 2115 } 2116 } else { 2117 int val = *valp; 2118 if (val < 0) { 2119 *negp = true; 2120 *lvalp = -(unsigned long)val; 2121 } else { 2122 *negp = false; 2123 *lvalp = (unsigned long)val; 2124 } 2125 } 2126 return 0; 2127 } 2128 2129 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp, 2130 int *valp, 2131 int write, void *data) 2132 { 2133 if (write) { 2134 if (*negp) 2135 return -EINVAL; 2136 *valp = *lvalp; 2137 } else { 2138 unsigned int val = *valp; 2139 *lvalp = (unsigned long)val; 2140 } 2141 return 0; 2142 } 2143 2144 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2145 2146 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2147 int write, void __user *buffer, 2148 size_t *lenp, loff_t *ppos, 2149 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2150 int write, void *data), 2151 void *data) 2152 { 2153 int *i, vleft, first = 1, err = 0; 2154 size_t left; 2155 char *kbuf = NULL, *p; 2156 2157 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2158 *lenp = 0; 2159 return 0; 2160 } 2161 2162 i = (int *) tbl_data; 2163 vleft = table->maxlen / sizeof(*i); 2164 left = *lenp; 2165 2166 if (!conv) 2167 conv = do_proc_dointvec_conv; 2168 2169 if (write) { 2170 if (*ppos) { 2171 switch (sysctl_writes_strict) { 2172 case SYSCTL_WRITES_STRICT: 2173 goto out; 2174 case SYSCTL_WRITES_WARN: 2175 warn_sysctl_write(table); 2176 break; 2177 default: 2178 break; 2179 } 2180 } 2181 2182 if (left > PAGE_SIZE - 1) 2183 left = PAGE_SIZE - 1; 2184 p = kbuf = memdup_user_nul(buffer, left); 2185 if (IS_ERR(kbuf)) 2186 return PTR_ERR(kbuf); 2187 } 2188 2189 for (; left && vleft--; i++, first=0) { 2190 unsigned long lval; 2191 bool neg; 2192 2193 if (write) { 2194 left -= proc_skip_spaces(&p); 2195 2196 if (!left) 2197 break; 2198 err = proc_get_long(&p, &left, &lval, &neg, 2199 proc_wspace_sep, 2200 sizeof(proc_wspace_sep), NULL); 2201 if (err) 2202 break; 2203 if (conv(&neg, &lval, i, 1, data)) { 2204 err = -EINVAL; 2205 break; 2206 } 2207 } else { 2208 if (conv(&neg, &lval, i, 0, data)) { 2209 err = -EINVAL; 2210 break; 2211 } 2212 if (!first) 2213 err = proc_put_char(&buffer, &left, '\t'); 2214 if (err) 2215 break; 2216 err = proc_put_long(&buffer, &left, lval, neg); 2217 if (err) 2218 break; 2219 } 2220 } 2221 2222 if (!write && !first && left && !err) 2223 err = proc_put_char(&buffer, &left, '\n'); 2224 if (write && !err && left) 2225 left -= proc_skip_spaces(&p); 2226 if (write) { 2227 kfree(kbuf); 2228 if (first) 2229 return err ? : -EINVAL; 2230 } 2231 *lenp -= left; 2232 out: 2233 *ppos += *lenp; 2234 return err; 2235 } 2236 2237 static int do_proc_dointvec(struct ctl_table *table, int write, 2238 void __user *buffer, size_t *lenp, loff_t *ppos, 2239 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2240 int write, void *data), 2241 void *data) 2242 { 2243 return __do_proc_dointvec(table->data, table, write, 2244 buffer, lenp, ppos, conv, data); 2245 } 2246 2247 /** 2248 * proc_dointvec - read a vector of integers 2249 * @table: the sysctl table 2250 * @write: %TRUE if this is a write to the sysctl file 2251 * @buffer: the user buffer 2252 * @lenp: the size of the user buffer 2253 * @ppos: file position 2254 * 2255 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2256 * values from/to the user buffer, treated as an ASCII string. 2257 * 2258 * Returns 0 on success. 2259 */ 2260 int proc_dointvec(struct ctl_table *table, int write, 2261 void __user *buffer, size_t *lenp, loff_t *ppos) 2262 { 2263 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2264 } 2265 2266 /** 2267 * proc_douintvec - read a vector of unsigned integers 2268 * @table: the sysctl table 2269 * @write: %TRUE if this is a write to the sysctl file 2270 * @buffer: the user buffer 2271 * @lenp: the size of the user buffer 2272 * @ppos: file position 2273 * 2274 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2275 * values from/to the user buffer, treated as an ASCII string. 2276 * 2277 * Returns 0 on success. 2278 */ 2279 int proc_douintvec(struct ctl_table *table, int write, 2280 void __user *buffer, size_t *lenp, loff_t *ppos) 2281 { 2282 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2283 do_proc_douintvec_conv, NULL); 2284 } 2285 2286 /* 2287 * Taint values can only be increased 2288 * This means we can safely use a temporary. 2289 */ 2290 static int proc_taint(struct ctl_table *table, int write, 2291 void __user *buffer, size_t *lenp, loff_t *ppos) 2292 { 2293 struct ctl_table t; 2294 unsigned long tmptaint = get_taint(); 2295 int err; 2296 2297 if (write && !capable(CAP_SYS_ADMIN)) 2298 return -EPERM; 2299 2300 t = *table; 2301 t.data = &tmptaint; 2302 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2303 if (err < 0) 2304 return err; 2305 2306 if (write) { 2307 /* 2308 * Poor man's atomic or. Not worth adding a primitive 2309 * to everyone's atomic.h for this 2310 */ 2311 int i; 2312 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2313 if ((tmptaint >> i) & 1) 2314 add_taint(i, LOCKDEP_STILL_OK); 2315 } 2316 } 2317 2318 return err; 2319 } 2320 2321 #ifdef CONFIG_PRINTK 2322 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2323 void __user *buffer, size_t *lenp, loff_t *ppos) 2324 { 2325 if (write && !capable(CAP_SYS_ADMIN)) 2326 return -EPERM; 2327 2328 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2329 } 2330 #endif 2331 2332 struct do_proc_dointvec_minmax_conv_param { 2333 int *min; 2334 int *max; 2335 }; 2336 2337 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2338 int *valp, 2339 int write, void *data) 2340 { 2341 struct do_proc_dointvec_minmax_conv_param *param = data; 2342 if (write) { 2343 int val = *negp ? -*lvalp : *lvalp; 2344 if ((param->min && *param->min > val) || 2345 (param->max && *param->max < val)) 2346 return -EINVAL; 2347 *valp = val; 2348 } else { 2349 int val = *valp; 2350 if (val < 0) { 2351 *negp = true; 2352 *lvalp = -(unsigned long)val; 2353 } else { 2354 *negp = false; 2355 *lvalp = (unsigned long)val; 2356 } 2357 } 2358 return 0; 2359 } 2360 2361 /** 2362 * proc_dointvec_minmax - read a vector of integers with min/max values 2363 * @table: the sysctl table 2364 * @write: %TRUE if this is a write to the sysctl file 2365 * @buffer: the user buffer 2366 * @lenp: the size of the user buffer 2367 * @ppos: file position 2368 * 2369 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2370 * values from/to the user buffer, treated as an ASCII string. 2371 * 2372 * This routine will ensure the values are within the range specified by 2373 * table->extra1 (min) and table->extra2 (max). 2374 * 2375 * Returns 0 on success. 2376 */ 2377 int proc_dointvec_minmax(struct ctl_table *table, int write, 2378 void __user *buffer, size_t *lenp, loff_t *ppos) 2379 { 2380 struct do_proc_dointvec_minmax_conv_param param = { 2381 .min = (int *) table->extra1, 2382 .max = (int *) table->extra2, 2383 }; 2384 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2385 do_proc_dointvec_minmax_conv, ¶m); 2386 } 2387 2388 static void validate_coredump_safety(void) 2389 { 2390 #ifdef CONFIG_COREDUMP 2391 if (suid_dumpable == SUID_DUMP_ROOT && 2392 core_pattern[0] != '/' && core_pattern[0] != '|') { 2393 printk(KERN_WARNING 2394 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2395 "Pipe handler or fully qualified core dump path required.\n" 2396 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2397 ); 2398 } 2399 #endif 2400 } 2401 2402 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2403 void __user *buffer, size_t *lenp, loff_t *ppos) 2404 { 2405 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2406 if (!error) 2407 validate_coredump_safety(); 2408 return error; 2409 } 2410 2411 #ifdef CONFIG_COREDUMP 2412 static int proc_dostring_coredump(struct ctl_table *table, int write, 2413 void __user *buffer, size_t *lenp, loff_t *ppos) 2414 { 2415 int error = proc_dostring(table, write, buffer, lenp, ppos); 2416 if (!error) 2417 validate_coredump_safety(); 2418 return error; 2419 } 2420 #endif 2421 2422 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2423 void __user *buffer, 2424 size_t *lenp, loff_t *ppos, 2425 unsigned long convmul, 2426 unsigned long convdiv) 2427 { 2428 unsigned long *i, *min, *max; 2429 int vleft, first = 1, err = 0; 2430 size_t left; 2431 char *kbuf = NULL, *p; 2432 2433 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2434 *lenp = 0; 2435 return 0; 2436 } 2437 2438 i = (unsigned long *) data; 2439 min = (unsigned long *) table->extra1; 2440 max = (unsigned long *) table->extra2; 2441 vleft = table->maxlen / sizeof(unsigned long); 2442 left = *lenp; 2443 2444 if (write) { 2445 if (*ppos) { 2446 switch (sysctl_writes_strict) { 2447 case SYSCTL_WRITES_STRICT: 2448 goto out; 2449 case SYSCTL_WRITES_WARN: 2450 warn_sysctl_write(table); 2451 break; 2452 default: 2453 break; 2454 } 2455 } 2456 2457 if (left > PAGE_SIZE - 1) 2458 left = PAGE_SIZE - 1; 2459 p = kbuf = memdup_user_nul(buffer, left); 2460 if (IS_ERR(kbuf)) 2461 return PTR_ERR(kbuf); 2462 } 2463 2464 for (; left && vleft--; i++, first = 0) { 2465 unsigned long val; 2466 2467 if (write) { 2468 bool neg; 2469 2470 left -= proc_skip_spaces(&p); 2471 2472 err = proc_get_long(&p, &left, &val, &neg, 2473 proc_wspace_sep, 2474 sizeof(proc_wspace_sep), NULL); 2475 if (err) 2476 break; 2477 if (neg) 2478 continue; 2479 val = convmul * val / convdiv; 2480 if ((min && val < *min) || (max && val > *max)) 2481 continue; 2482 *i = val; 2483 } else { 2484 val = convdiv * (*i) / convmul; 2485 if (!first) { 2486 err = proc_put_char(&buffer, &left, '\t'); 2487 if (err) 2488 break; 2489 } 2490 err = proc_put_long(&buffer, &left, val, false); 2491 if (err) 2492 break; 2493 } 2494 } 2495 2496 if (!write && !first && left && !err) 2497 err = proc_put_char(&buffer, &left, '\n'); 2498 if (write && !err) 2499 left -= proc_skip_spaces(&p); 2500 if (write) { 2501 kfree(kbuf); 2502 if (first) 2503 return err ? : -EINVAL; 2504 } 2505 *lenp -= left; 2506 out: 2507 *ppos += *lenp; 2508 return err; 2509 } 2510 2511 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2512 void __user *buffer, 2513 size_t *lenp, loff_t *ppos, 2514 unsigned long convmul, 2515 unsigned long convdiv) 2516 { 2517 return __do_proc_doulongvec_minmax(table->data, table, write, 2518 buffer, lenp, ppos, convmul, convdiv); 2519 } 2520 2521 /** 2522 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2523 * @table: the sysctl table 2524 * @write: %TRUE if this is a write to the sysctl file 2525 * @buffer: the user buffer 2526 * @lenp: the size of the user buffer 2527 * @ppos: file position 2528 * 2529 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2530 * values from/to the user buffer, treated as an ASCII string. 2531 * 2532 * This routine will ensure the values are within the range specified by 2533 * table->extra1 (min) and table->extra2 (max). 2534 * 2535 * Returns 0 on success. 2536 */ 2537 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2538 void __user *buffer, size_t *lenp, loff_t *ppos) 2539 { 2540 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2541 } 2542 2543 /** 2544 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2545 * @table: the sysctl table 2546 * @write: %TRUE if this is a write to the sysctl file 2547 * @buffer: the user buffer 2548 * @lenp: the size of the user buffer 2549 * @ppos: file position 2550 * 2551 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2552 * values from/to the user buffer, treated as an ASCII string. The values 2553 * are treated as milliseconds, and converted to jiffies when they are stored. 2554 * 2555 * This routine will ensure the values are within the range specified by 2556 * table->extra1 (min) and table->extra2 (max). 2557 * 2558 * Returns 0 on success. 2559 */ 2560 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2561 void __user *buffer, 2562 size_t *lenp, loff_t *ppos) 2563 { 2564 return do_proc_doulongvec_minmax(table, write, buffer, 2565 lenp, ppos, HZ, 1000l); 2566 } 2567 2568 2569 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2570 int *valp, 2571 int write, void *data) 2572 { 2573 if (write) { 2574 if (*lvalp > LONG_MAX / HZ) 2575 return 1; 2576 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2577 } else { 2578 int val = *valp; 2579 unsigned long lval; 2580 if (val < 0) { 2581 *negp = true; 2582 lval = -(unsigned long)val; 2583 } else { 2584 *negp = false; 2585 lval = (unsigned long)val; 2586 } 2587 *lvalp = lval / HZ; 2588 } 2589 return 0; 2590 } 2591 2592 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2593 int *valp, 2594 int write, void *data) 2595 { 2596 if (write) { 2597 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2598 return 1; 2599 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2600 } else { 2601 int val = *valp; 2602 unsigned long lval; 2603 if (val < 0) { 2604 *negp = true; 2605 lval = -(unsigned long)val; 2606 } else { 2607 *negp = false; 2608 lval = (unsigned long)val; 2609 } 2610 *lvalp = jiffies_to_clock_t(lval); 2611 } 2612 return 0; 2613 } 2614 2615 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2616 int *valp, 2617 int write, void *data) 2618 { 2619 if (write) { 2620 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2621 2622 if (jif > INT_MAX) 2623 return 1; 2624 *valp = (int)jif; 2625 } else { 2626 int val = *valp; 2627 unsigned long lval; 2628 if (val < 0) { 2629 *negp = true; 2630 lval = -(unsigned long)val; 2631 } else { 2632 *negp = false; 2633 lval = (unsigned long)val; 2634 } 2635 *lvalp = jiffies_to_msecs(lval); 2636 } 2637 return 0; 2638 } 2639 2640 /** 2641 * proc_dointvec_jiffies - read a vector of integers as seconds 2642 * @table: the sysctl table 2643 * @write: %TRUE if this is a write to the sysctl file 2644 * @buffer: the user buffer 2645 * @lenp: the size of the user buffer 2646 * @ppos: file position 2647 * 2648 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2649 * values from/to the user buffer, treated as an ASCII string. 2650 * The values read are assumed to be in seconds, and are converted into 2651 * jiffies. 2652 * 2653 * Returns 0 on success. 2654 */ 2655 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2656 void __user *buffer, size_t *lenp, loff_t *ppos) 2657 { 2658 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2659 do_proc_dointvec_jiffies_conv,NULL); 2660 } 2661 2662 /** 2663 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2664 * @table: the sysctl table 2665 * @write: %TRUE if this is a write to the sysctl file 2666 * @buffer: the user buffer 2667 * @lenp: the size of the user buffer 2668 * @ppos: pointer to the file position 2669 * 2670 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2671 * values from/to the user buffer, treated as an ASCII string. 2672 * The values read are assumed to be in 1/USER_HZ seconds, and 2673 * are converted into jiffies. 2674 * 2675 * Returns 0 on success. 2676 */ 2677 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2678 void __user *buffer, size_t *lenp, loff_t *ppos) 2679 { 2680 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2681 do_proc_dointvec_userhz_jiffies_conv,NULL); 2682 } 2683 2684 /** 2685 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2686 * @table: the sysctl table 2687 * @write: %TRUE if this is a write to the sysctl file 2688 * @buffer: the user buffer 2689 * @lenp: the size of the user buffer 2690 * @ppos: file position 2691 * @ppos: the current position in the file 2692 * 2693 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2694 * values from/to the user buffer, treated as an ASCII string. 2695 * The values read are assumed to be in 1/1000 seconds, and 2696 * are converted into jiffies. 2697 * 2698 * Returns 0 on success. 2699 */ 2700 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2701 void __user *buffer, size_t *lenp, loff_t *ppos) 2702 { 2703 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2704 do_proc_dointvec_ms_jiffies_conv, NULL); 2705 } 2706 2707 static int proc_do_cad_pid(struct ctl_table *table, int write, 2708 void __user *buffer, size_t *lenp, loff_t *ppos) 2709 { 2710 struct pid *new_pid; 2711 pid_t tmp; 2712 int r; 2713 2714 tmp = pid_vnr(cad_pid); 2715 2716 r = __do_proc_dointvec(&tmp, table, write, buffer, 2717 lenp, ppos, NULL, NULL); 2718 if (r || !write) 2719 return r; 2720 2721 new_pid = find_get_pid(tmp); 2722 if (!new_pid) 2723 return -ESRCH; 2724 2725 put_pid(xchg(&cad_pid, new_pid)); 2726 return 0; 2727 } 2728 2729 /** 2730 * proc_do_large_bitmap - read/write from/to a large bitmap 2731 * @table: the sysctl table 2732 * @write: %TRUE if this is a write to the sysctl file 2733 * @buffer: the user buffer 2734 * @lenp: the size of the user buffer 2735 * @ppos: file position 2736 * 2737 * The bitmap is stored at table->data and the bitmap length (in bits) 2738 * in table->maxlen. 2739 * 2740 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2741 * large bitmaps may be represented in a compact manner. Writing into 2742 * the file will clear the bitmap then update it with the given input. 2743 * 2744 * Returns 0 on success. 2745 */ 2746 int proc_do_large_bitmap(struct ctl_table *table, int write, 2747 void __user *buffer, size_t *lenp, loff_t *ppos) 2748 { 2749 int err = 0; 2750 bool first = 1; 2751 size_t left = *lenp; 2752 unsigned long bitmap_len = table->maxlen; 2753 unsigned long *bitmap = *(unsigned long **) table->data; 2754 unsigned long *tmp_bitmap = NULL; 2755 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2756 2757 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2758 *lenp = 0; 2759 return 0; 2760 } 2761 2762 if (write) { 2763 char *kbuf, *p; 2764 2765 if (left > PAGE_SIZE - 1) 2766 left = PAGE_SIZE - 1; 2767 2768 p = kbuf = memdup_user_nul(buffer, left); 2769 if (IS_ERR(kbuf)) 2770 return PTR_ERR(kbuf); 2771 2772 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2773 GFP_KERNEL); 2774 if (!tmp_bitmap) { 2775 kfree(kbuf); 2776 return -ENOMEM; 2777 } 2778 proc_skip_char(&p, &left, '\n'); 2779 while (!err && left) { 2780 unsigned long val_a, val_b; 2781 bool neg; 2782 2783 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 2784 sizeof(tr_a), &c); 2785 if (err) 2786 break; 2787 if (val_a >= bitmap_len || neg) { 2788 err = -EINVAL; 2789 break; 2790 } 2791 2792 val_b = val_a; 2793 if (left) { 2794 p++; 2795 left--; 2796 } 2797 2798 if (c == '-') { 2799 err = proc_get_long(&p, &left, &val_b, 2800 &neg, tr_b, sizeof(tr_b), 2801 &c); 2802 if (err) 2803 break; 2804 if (val_b >= bitmap_len || neg || 2805 val_a > val_b) { 2806 err = -EINVAL; 2807 break; 2808 } 2809 if (left) { 2810 p++; 2811 left--; 2812 } 2813 } 2814 2815 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2816 first = 0; 2817 proc_skip_char(&p, &left, '\n'); 2818 } 2819 kfree(kbuf); 2820 } else { 2821 unsigned long bit_a, bit_b = 0; 2822 2823 while (left) { 2824 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2825 if (bit_a >= bitmap_len) 2826 break; 2827 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2828 bit_a + 1) - 1; 2829 2830 if (!first) { 2831 err = proc_put_char(&buffer, &left, ','); 2832 if (err) 2833 break; 2834 } 2835 err = proc_put_long(&buffer, &left, bit_a, false); 2836 if (err) 2837 break; 2838 if (bit_a != bit_b) { 2839 err = proc_put_char(&buffer, &left, '-'); 2840 if (err) 2841 break; 2842 err = proc_put_long(&buffer, &left, bit_b, false); 2843 if (err) 2844 break; 2845 } 2846 2847 first = 0; bit_b++; 2848 } 2849 if (!err) 2850 err = proc_put_char(&buffer, &left, '\n'); 2851 } 2852 2853 if (!err) { 2854 if (write) { 2855 if (*ppos) 2856 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2857 else 2858 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2859 } 2860 kfree(tmp_bitmap); 2861 *lenp -= left; 2862 *ppos += *lenp; 2863 return 0; 2864 } else { 2865 kfree(tmp_bitmap); 2866 return err; 2867 } 2868 } 2869 2870 #else /* CONFIG_PROC_SYSCTL */ 2871 2872 int proc_dostring(struct ctl_table *table, int write, 2873 void __user *buffer, size_t *lenp, loff_t *ppos) 2874 { 2875 return -ENOSYS; 2876 } 2877 2878 int proc_dointvec(struct ctl_table *table, int write, 2879 void __user *buffer, size_t *lenp, loff_t *ppos) 2880 { 2881 return -ENOSYS; 2882 } 2883 2884 int proc_douintvec(struct ctl_table *table, int write, 2885 void __user *buffer, size_t *lenp, loff_t *ppos) 2886 { 2887 return -ENOSYS; 2888 } 2889 2890 int proc_dointvec_minmax(struct ctl_table *table, int write, 2891 void __user *buffer, size_t *lenp, loff_t *ppos) 2892 { 2893 return -ENOSYS; 2894 } 2895 2896 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2897 void __user *buffer, size_t *lenp, loff_t *ppos) 2898 { 2899 return -ENOSYS; 2900 } 2901 2902 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2903 void __user *buffer, size_t *lenp, loff_t *ppos) 2904 { 2905 return -ENOSYS; 2906 } 2907 2908 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2909 void __user *buffer, size_t *lenp, loff_t *ppos) 2910 { 2911 return -ENOSYS; 2912 } 2913 2914 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2915 void __user *buffer, size_t *lenp, loff_t *ppos) 2916 { 2917 return -ENOSYS; 2918 } 2919 2920 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2921 void __user *buffer, 2922 size_t *lenp, loff_t *ppos) 2923 { 2924 return -ENOSYS; 2925 } 2926 2927 2928 #endif /* CONFIG_PROC_SYSCTL */ 2929 2930 /* 2931 * No sense putting this after each symbol definition, twice, 2932 * exception granted :-) 2933 */ 2934 EXPORT_SYMBOL(proc_dointvec); 2935 EXPORT_SYMBOL(proc_douintvec); 2936 EXPORT_SYMBOL(proc_dointvec_jiffies); 2937 EXPORT_SYMBOL(proc_dointvec_minmax); 2938 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2939 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2940 EXPORT_SYMBOL(proc_dostring); 2941 EXPORT_SYMBOL(proc_doulongvec_minmax); 2942 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2943