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 .extra1 = &zero, 1180 .extra2 = &one, 1181 }, 1182 #endif 1183 #ifdef CONFIG_BPF_SYSCALL 1184 { 1185 .procname = "unprivileged_bpf_disabled", 1186 .data = &sysctl_unprivileged_bpf_disabled, 1187 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1188 .mode = 0644, 1189 /* only handle a transition from default "0" to "1" */ 1190 .proc_handler = proc_dointvec_minmax, 1191 .extra1 = &one, 1192 .extra2 = &one, 1193 }, 1194 #endif 1195 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1196 { 1197 .procname = "panic_on_rcu_stall", 1198 .data = &sysctl_panic_on_rcu_stall, 1199 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1200 .mode = 0644, 1201 .proc_handler = proc_dointvec_minmax, 1202 .extra1 = &zero, 1203 .extra2 = &one, 1204 }, 1205 #endif 1206 { } 1207 }; 1208 1209 static struct ctl_table vm_table[] = { 1210 { 1211 .procname = "overcommit_memory", 1212 .data = &sysctl_overcommit_memory, 1213 .maxlen = sizeof(sysctl_overcommit_memory), 1214 .mode = 0644, 1215 .proc_handler = proc_dointvec_minmax, 1216 .extra1 = &zero, 1217 .extra2 = &two, 1218 }, 1219 { 1220 .procname = "panic_on_oom", 1221 .data = &sysctl_panic_on_oom, 1222 .maxlen = sizeof(sysctl_panic_on_oom), 1223 .mode = 0644, 1224 .proc_handler = proc_dointvec_minmax, 1225 .extra1 = &zero, 1226 .extra2 = &two, 1227 }, 1228 { 1229 .procname = "oom_kill_allocating_task", 1230 .data = &sysctl_oom_kill_allocating_task, 1231 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1232 .mode = 0644, 1233 .proc_handler = proc_dointvec, 1234 }, 1235 { 1236 .procname = "oom_dump_tasks", 1237 .data = &sysctl_oom_dump_tasks, 1238 .maxlen = sizeof(sysctl_oom_dump_tasks), 1239 .mode = 0644, 1240 .proc_handler = proc_dointvec, 1241 }, 1242 { 1243 .procname = "overcommit_ratio", 1244 .data = &sysctl_overcommit_ratio, 1245 .maxlen = sizeof(sysctl_overcommit_ratio), 1246 .mode = 0644, 1247 .proc_handler = overcommit_ratio_handler, 1248 }, 1249 { 1250 .procname = "overcommit_kbytes", 1251 .data = &sysctl_overcommit_kbytes, 1252 .maxlen = sizeof(sysctl_overcommit_kbytes), 1253 .mode = 0644, 1254 .proc_handler = overcommit_kbytes_handler, 1255 }, 1256 { 1257 .procname = "page-cluster", 1258 .data = &page_cluster, 1259 .maxlen = sizeof(int), 1260 .mode = 0644, 1261 .proc_handler = proc_dointvec_minmax, 1262 .extra1 = &zero, 1263 }, 1264 { 1265 .procname = "dirty_background_ratio", 1266 .data = &dirty_background_ratio, 1267 .maxlen = sizeof(dirty_background_ratio), 1268 .mode = 0644, 1269 .proc_handler = dirty_background_ratio_handler, 1270 .extra1 = &zero, 1271 .extra2 = &one_hundred, 1272 }, 1273 { 1274 .procname = "dirty_background_bytes", 1275 .data = &dirty_background_bytes, 1276 .maxlen = sizeof(dirty_background_bytes), 1277 .mode = 0644, 1278 .proc_handler = dirty_background_bytes_handler, 1279 .extra1 = &one_ul, 1280 }, 1281 { 1282 .procname = "dirty_ratio", 1283 .data = &vm_dirty_ratio, 1284 .maxlen = sizeof(vm_dirty_ratio), 1285 .mode = 0644, 1286 .proc_handler = dirty_ratio_handler, 1287 .extra1 = &zero, 1288 .extra2 = &one_hundred, 1289 }, 1290 { 1291 .procname = "dirty_bytes", 1292 .data = &vm_dirty_bytes, 1293 .maxlen = sizeof(vm_dirty_bytes), 1294 .mode = 0644, 1295 .proc_handler = dirty_bytes_handler, 1296 .extra1 = &dirty_bytes_min, 1297 }, 1298 { 1299 .procname = "dirty_writeback_centisecs", 1300 .data = &dirty_writeback_interval, 1301 .maxlen = sizeof(dirty_writeback_interval), 1302 .mode = 0644, 1303 .proc_handler = dirty_writeback_centisecs_handler, 1304 }, 1305 { 1306 .procname = "dirty_expire_centisecs", 1307 .data = &dirty_expire_interval, 1308 .maxlen = sizeof(dirty_expire_interval), 1309 .mode = 0644, 1310 .proc_handler = proc_dointvec_minmax, 1311 .extra1 = &zero, 1312 }, 1313 { 1314 .procname = "dirtytime_expire_seconds", 1315 .data = &dirtytime_expire_interval, 1316 .maxlen = sizeof(dirty_expire_interval), 1317 .mode = 0644, 1318 .proc_handler = dirtytime_interval_handler, 1319 .extra1 = &zero, 1320 }, 1321 { 1322 .procname = "nr_pdflush_threads", 1323 .mode = 0444 /* read-only */, 1324 .proc_handler = pdflush_proc_obsolete, 1325 }, 1326 { 1327 .procname = "swappiness", 1328 .data = &vm_swappiness, 1329 .maxlen = sizeof(vm_swappiness), 1330 .mode = 0644, 1331 .proc_handler = proc_dointvec_minmax, 1332 .extra1 = &zero, 1333 .extra2 = &one_hundred, 1334 }, 1335 #ifdef CONFIG_HUGETLB_PAGE 1336 { 1337 .procname = "nr_hugepages", 1338 .data = NULL, 1339 .maxlen = sizeof(unsigned long), 1340 .mode = 0644, 1341 .proc_handler = hugetlb_sysctl_handler, 1342 }, 1343 #ifdef CONFIG_NUMA 1344 { 1345 .procname = "nr_hugepages_mempolicy", 1346 .data = NULL, 1347 .maxlen = sizeof(unsigned long), 1348 .mode = 0644, 1349 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1350 }, 1351 #endif 1352 { 1353 .procname = "hugetlb_shm_group", 1354 .data = &sysctl_hugetlb_shm_group, 1355 .maxlen = sizeof(gid_t), 1356 .mode = 0644, 1357 .proc_handler = proc_dointvec, 1358 }, 1359 { 1360 .procname = "hugepages_treat_as_movable", 1361 .data = &hugepages_treat_as_movable, 1362 .maxlen = sizeof(int), 1363 .mode = 0644, 1364 .proc_handler = proc_dointvec, 1365 }, 1366 { 1367 .procname = "nr_overcommit_hugepages", 1368 .data = NULL, 1369 .maxlen = sizeof(unsigned long), 1370 .mode = 0644, 1371 .proc_handler = hugetlb_overcommit_handler, 1372 }, 1373 #endif 1374 { 1375 .procname = "lowmem_reserve_ratio", 1376 .data = &sysctl_lowmem_reserve_ratio, 1377 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1378 .mode = 0644, 1379 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1380 }, 1381 { 1382 .procname = "drop_caches", 1383 .data = &sysctl_drop_caches, 1384 .maxlen = sizeof(int), 1385 .mode = 0644, 1386 .proc_handler = drop_caches_sysctl_handler, 1387 .extra1 = &one, 1388 .extra2 = &four, 1389 }, 1390 #ifdef CONFIG_COMPACTION 1391 { 1392 .procname = "compact_memory", 1393 .data = &sysctl_compact_memory, 1394 .maxlen = sizeof(int), 1395 .mode = 0200, 1396 .proc_handler = sysctl_compaction_handler, 1397 }, 1398 { 1399 .procname = "extfrag_threshold", 1400 .data = &sysctl_extfrag_threshold, 1401 .maxlen = sizeof(int), 1402 .mode = 0644, 1403 .proc_handler = sysctl_extfrag_handler, 1404 .extra1 = &min_extfrag_threshold, 1405 .extra2 = &max_extfrag_threshold, 1406 }, 1407 { 1408 .procname = "compact_unevictable_allowed", 1409 .data = &sysctl_compact_unevictable_allowed, 1410 .maxlen = sizeof(int), 1411 .mode = 0644, 1412 .proc_handler = proc_dointvec, 1413 .extra1 = &zero, 1414 .extra2 = &one, 1415 }, 1416 1417 #endif /* CONFIG_COMPACTION */ 1418 { 1419 .procname = "min_free_kbytes", 1420 .data = &min_free_kbytes, 1421 .maxlen = sizeof(min_free_kbytes), 1422 .mode = 0644, 1423 .proc_handler = min_free_kbytes_sysctl_handler, 1424 .extra1 = &zero, 1425 }, 1426 { 1427 .procname = "watermark_scale_factor", 1428 .data = &watermark_scale_factor, 1429 .maxlen = sizeof(watermark_scale_factor), 1430 .mode = 0644, 1431 .proc_handler = watermark_scale_factor_sysctl_handler, 1432 .extra1 = &one, 1433 .extra2 = &one_thousand, 1434 }, 1435 { 1436 .procname = "percpu_pagelist_fraction", 1437 .data = &percpu_pagelist_fraction, 1438 .maxlen = sizeof(percpu_pagelist_fraction), 1439 .mode = 0644, 1440 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1441 .extra1 = &zero, 1442 }, 1443 #ifdef CONFIG_MMU 1444 { 1445 .procname = "max_map_count", 1446 .data = &sysctl_max_map_count, 1447 .maxlen = sizeof(sysctl_max_map_count), 1448 .mode = 0644, 1449 .proc_handler = proc_dointvec_minmax, 1450 .extra1 = &zero, 1451 }, 1452 #else 1453 { 1454 .procname = "nr_trim_pages", 1455 .data = &sysctl_nr_trim_pages, 1456 .maxlen = sizeof(sysctl_nr_trim_pages), 1457 .mode = 0644, 1458 .proc_handler = proc_dointvec_minmax, 1459 .extra1 = &zero, 1460 }, 1461 #endif 1462 { 1463 .procname = "laptop_mode", 1464 .data = &laptop_mode, 1465 .maxlen = sizeof(laptop_mode), 1466 .mode = 0644, 1467 .proc_handler = proc_dointvec_jiffies, 1468 }, 1469 { 1470 .procname = "block_dump", 1471 .data = &block_dump, 1472 .maxlen = sizeof(block_dump), 1473 .mode = 0644, 1474 .proc_handler = proc_dointvec, 1475 .extra1 = &zero, 1476 }, 1477 { 1478 .procname = "vfs_cache_pressure", 1479 .data = &sysctl_vfs_cache_pressure, 1480 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1481 .mode = 0644, 1482 .proc_handler = proc_dointvec, 1483 .extra1 = &zero, 1484 }, 1485 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1486 { 1487 .procname = "legacy_va_layout", 1488 .data = &sysctl_legacy_va_layout, 1489 .maxlen = sizeof(sysctl_legacy_va_layout), 1490 .mode = 0644, 1491 .proc_handler = proc_dointvec, 1492 .extra1 = &zero, 1493 }, 1494 #endif 1495 #ifdef CONFIG_NUMA 1496 { 1497 .procname = "zone_reclaim_mode", 1498 .data = &node_reclaim_mode, 1499 .maxlen = sizeof(node_reclaim_mode), 1500 .mode = 0644, 1501 .proc_handler = proc_dointvec, 1502 .extra1 = &zero, 1503 }, 1504 { 1505 .procname = "min_unmapped_ratio", 1506 .data = &sysctl_min_unmapped_ratio, 1507 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1508 .mode = 0644, 1509 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1510 .extra1 = &zero, 1511 .extra2 = &one_hundred, 1512 }, 1513 { 1514 .procname = "min_slab_ratio", 1515 .data = &sysctl_min_slab_ratio, 1516 .maxlen = sizeof(sysctl_min_slab_ratio), 1517 .mode = 0644, 1518 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1519 .extra1 = &zero, 1520 .extra2 = &one_hundred, 1521 }, 1522 #endif 1523 #ifdef CONFIG_SMP 1524 { 1525 .procname = "stat_interval", 1526 .data = &sysctl_stat_interval, 1527 .maxlen = sizeof(sysctl_stat_interval), 1528 .mode = 0644, 1529 .proc_handler = proc_dointvec_jiffies, 1530 }, 1531 { 1532 .procname = "stat_refresh", 1533 .data = NULL, 1534 .maxlen = 0, 1535 .mode = 0600, 1536 .proc_handler = vmstat_refresh, 1537 }, 1538 #endif 1539 #ifdef CONFIG_MMU 1540 { 1541 .procname = "mmap_min_addr", 1542 .data = &dac_mmap_min_addr, 1543 .maxlen = sizeof(unsigned long), 1544 .mode = 0644, 1545 .proc_handler = mmap_min_addr_handler, 1546 }, 1547 #endif 1548 #ifdef CONFIG_NUMA 1549 { 1550 .procname = "numa_zonelist_order", 1551 .data = &numa_zonelist_order, 1552 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1553 .mode = 0644, 1554 .proc_handler = numa_zonelist_order_handler, 1555 }, 1556 #endif 1557 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1558 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1559 { 1560 .procname = "vdso_enabled", 1561 #ifdef CONFIG_X86_32 1562 .data = &vdso32_enabled, 1563 .maxlen = sizeof(vdso32_enabled), 1564 #else 1565 .data = &vdso_enabled, 1566 .maxlen = sizeof(vdso_enabled), 1567 #endif 1568 .mode = 0644, 1569 .proc_handler = proc_dointvec, 1570 .extra1 = &zero, 1571 }, 1572 #endif 1573 #ifdef CONFIG_HIGHMEM 1574 { 1575 .procname = "highmem_is_dirtyable", 1576 .data = &vm_highmem_is_dirtyable, 1577 .maxlen = sizeof(vm_highmem_is_dirtyable), 1578 .mode = 0644, 1579 .proc_handler = proc_dointvec_minmax, 1580 .extra1 = &zero, 1581 .extra2 = &one, 1582 }, 1583 #endif 1584 #ifdef CONFIG_MEMORY_FAILURE 1585 { 1586 .procname = "memory_failure_early_kill", 1587 .data = &sysctl_memory_failure_early_kill, 1588 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1589 .mode = 0644, 1590 .proc_handler = proc_dointvec_minmax, 1591 .extra1 = &zero, 1592 .extra2 = &one, 1593 }, 1594 { 1595 .procname = "memory_failure_recovery", 1596 .data = &sysctl_memory_failure_recovery, 1597 .maxlen = sizeof(sysctl_memory_failure_recovery), 1598 .mode = 0644, 1599 .proc_handler = proc_dointvec_minmax, 1600 .extra1 = &zero, 1601 .extra2 = &one, 1602 }, 1603 #endif 1604 { 1605 .procname = "user_reserve_kbytes", 1606 .data = &sysctl_user_reserve_kbytes, 1607 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1608 .mode = 0644, 1609 .proc_handler = proc_doulongvec_minmax, 1610 }, 1611 { 1612 .procname = "admin_reserve_kbytes", 1613 .data = &sysctl_admin_reserve_kbytes, 1614 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1615 .mode = 0644, 1616 .proc_handler = proc_doulongvec_minmax, 1617 }, 1618 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1619 { 1620 .procname = "mmap_rnd_bits", 1621 .data = &mmap_rnd_bits, 1622 .maxlen = sizeof(mmap_rnd_bits), 1623 .mode = 0600, 1624 .proc_handler = proc_dointvec_minmax, 1625 .extra1 = (void *)&mmap_rnd_bits_min, 1626 .extra2 = (void *)&mmap_rnd_bits_max, 1627 }, 1628 #endif 1629 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1630 { 1631 .procname = "mmap_rnd_compat_bits", 1632 .data = &mmap_rnd_compat_bits, 1633 .maxlen = sizeof(mmap_rnd_compat_bits), 1634 .mode = 0600, 1635 .proc_handler = proc_dointvec_minmax, 1636 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1637 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1638 }, 1639 #endif 1640 { } 1641 }; 1642 1643 static struct ctl_table fs_table[] = { 1644 { 1645 .procname = "inode-nr", 1646 .data = &inodes_stat, 1647 .maxlen = 2*sizeof(long), 1648 .mode = 0444, 1649 .proc_handler = proc_nr_inodes, 1650 }, 1651 { 1652 .procname = "inode-state", 1653 .data = &inodes_stat, 1654 .maxlen = 7*sizeof(long), 1655 .mode = 0444, 1656 .proc_handler = proc_nr_inodes, 1657 }, 1658 { 1659 .procname = "file-nr", 1660 .data = &files_stat, 1661 .maxlen = sizeof(files_stat), 1662 .mode = 0444, 1663 .proc_handler = proc_nr_files, 1664 }, 1665 { 1666 .procname = "file-max", 1667 .data = &files_stat.max_files, 1668 .maxlen = sizeof(files_stat.max_files), 1669 .mode = 0644, 1670 .proc_handler = proc_doulongvec_minmax, 1671 }, 1672 { 1673 .procname = "nr_open", 1674 .data = &sysctl_nr_open, 1675 .maxlen = sizeof(unsigned int), 1676 .mode = 0644, 1677 .proc_handler = proc_dointvec_minmax, 1678 .extra1 = &sysctl_nr_open_min, 1679 .extra2 = &sysctl_nr_open_max, 1680 }, 1681 { 1682 .procname = "dentry-state", 1683 .data = &dentry_stat, 1684 .maxlen = 6*sizeof(long), 1685 .mode = 0444, 1686 .proc_handler = proc_nr_dentry, 1687 }, 1688 { 1689 .procname = "overflowuid", 1690 .data = &fs_overflowuid, 1691 .maxlen = sizeof(int), 1692 .mode = 0644, 1693 .proc_handler = proc_dointvec_minmax, 1694 .extra1 = &minolduid, 1695 .extra2 = &maxolduid, 1696 }, 1697 { 1698 .procname = "overflowgid", 1699 .data = &fs_overflowgid, 1700 .maxlen = sizeof(int), 1701 .mode = 0644, 1702 .proc_handler = proc_dointvec_minmax, 1703 .extra1 = &minolduid, 1704 .extra2 = &maxolduid, 1705 }, 1706 #ifdef CONFIG_FILE_LOCKING 1707 { 1708 .procname = "leases-enable", 1709 .data = &leases_enable, 1710 .maxlen = sizeof(int), 1711 .mode = 0644, 1712 .proc_handler = proc_dointvec, 1713 }, 1714 #endif 1715 #ifdef CONFIG_DNOTIFY 1716 { 1717 .procname = "dir-notify-enable", 1718 .data = &dir_notify_enable, 1719 .maxlen = sizeof(int), 1720 .mode = 0644, 1721 .proc_handler = proc_dointvec, 1722 }, 1723 #endif 1724 #ifdef CONFIG_MMU 1725 #ifdef CONFIG_FILE_LOCKING 1726 { 1727 .procname = "lease-break-time", 1728 .data = &lease_break_time, 1729 .maxlen = sizeof(int), 1730 .mode = 0644, 1731 .proc_handler = proc_dointvec, 1732 }, 1733 #endif 1734 #ifdef CONFIG_AIO 1735 { 1736 .procname = "aio-nr", 1737 .data = &aio_nr, 1738 .maxlen = sizeof(aio_nr), 1739 .mode = 0444, 1740 .proc_handler = proc_doulongvec_minmax, 1741 }, 1742 { 1743 .procname = "aio-max-nr", 1744 .data = &aio_max_nr, 1745 .maxlen = sizeof(aio_max_nr), 1746 .mode = 0644, 1747 .proc_handler = proc_doulongvec_minmax, 1748 }, 1749 #endif /* CONFIG_AIO */ 1750 #ifdef CONFIG_INOTIFY_USER 1751 { 1752 .procname = "inotify", 1753 .mode = 0555, 1754 .child = inotify_table, 1755 }, 1756 #endif 1757 #ifdef CONFIG_EPOLL 1758 { 1759 .procname = "epoll", 1760 .mode = 0555, 1761 .child = epoll_table, 1762 }, 1763 #endif 1764 #endif 1765 { 1766 .procname = "protected_symlinks", 1767 .data = &sysctl_protected_symlinks, 1768 .maxlen = sizeof(int), 1769 .mode = 0600, 1770 .proc_handler = proc_dointvec_minmax, 1771 .extra1 = &zero, 1772 .extra2 = &one, 1773 }, 1774 { 1775 .procname = "protected_hardlinks", 1776 .data = &sysctl_protected_hardlinks, 1777 .maxlen = sizeof(int), 1778 .mode = 0600, 1779 .proc_handler = proc_dointvec_minmax, 1780 .extra1 = &zero, 1781 .extra2 = &one, 1782 }, 1783 { 1784 .procname = "suid_dumpable", 1785 .data = &suid_dumpable, 1786 .maxlen = sizeof(int), 1787 .mode = 0644, 1788 .proc_handler = proc_dointvec_minmax_coredump, 1789 .extra1 = &zero, 1790 .extra2 = &two, 1791 }, 1792 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1793 { 1794 .procname = "binfmt_misc", 1795 .mode = 0555, 1796 .child = sysctl_mount_point, 1797 }, 1798 #endif 1799 { 1800 .procname = "pipe-max-size", 1801 .data = &pipe_max_size, 1802 .maxlen = sizeof(int), 1803 .mode = 0644, 1804 .proc_handler = &pipe_proc_fn, 1805 .extra1 = &pipe_min_size, 1806 }, 1807 { 1808 .procname = "pipe-user-pages-hard", 1809 .data = &pipe_user_pages_hard, 1810 .maxlen = sizeof(pipe_user_pages_hard), 1811 .mode = 0644, 1812 .proc_handler = proc_doulongvec_minmax, 1813 }, 1814 { 1815 .procname = "pipe-user-pages-soft", 1816 .data = &pipe_user_pages_soft, 1817 .maxlen = sizeof(pipe_user_pages_soft), 1818 .mode = 0644, 1819 .proc_handler = proc_doulongvec_minmax, 1820 }, 1821 { 1822 .procname = "mount-max", 1823 .data = &sysctl_mount_max, 1824 .maxlen = sizeof(unsigned int), 1825 .mode = 0644, 1826 .proc_handler = proc_dointvec_minmax, 1827 .extra1 = &one, 1828 }, 1829 { } 1830 }; 1831 1832 static struct ctl_table debug_table[] = { 1833 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1834 { 1835 .procname = "exception-trace", 1836 .data = &show_unhandled_signals, 1837 .maxlen = sizeof(int), 1838 .mode = 0644, 1839 .proc_handler = proc_dointvec 1840 }, 1841 #endif 1842 #if defined(CONFIG_OPTPROBES) 1843 { 1844 .procname = "kprobes-optimization", 1845 .data = &sysctl_kprobes_optimization, 1846 .maxlen = sizeof(int), 1847 .mode = 0644, 1848 .proc_handler = proc_kprobes_optimization_handler, 1849 .extra1 = &zero, 1850 .extra2 = &one, 1851 }, 1852 #endif 1853 { } 1854 }; 1855 1856 static struct ctl_table dev_table[] = { 1857 { } 1858 }; 1859 1860 int __init sysctl_init(void) 1861 { 1862 struct ctl_table_header *hdr; 1863 1864 hdr = register_sysctl_table(sysctl_base_table); 1865 kmemleak_not_leak(hdr); 1866 return 0; 1867 } 1868 1869 #endif /* CONFIG_SYSCTL */ 1870 1871 /* 1872 * /proc/sys support 1873 */ 1874 1875 #ifdef CONFIG_PROC_SYSCTL 1876 1877 static int _proc_do_string(char *data, int maxlen, int write, 1878 char __user *buffer, 1879 size_t *lenp, loff_t *ppos) 1880 { 1881 size_t len; 1882 char __user *p; 1883 char c; 1884 1885 if (!data || !maxlen || !*lenp) { 1886 *lenp = 0; 1887 return 0; 1888 } 1889 1890 if (write) { 1891 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1892 /* Only continue writes not past the end of buffer. */ 1893 len = strlen(data); 1894 if (len > maxlen - 1) 1895 len = maxlen - 1; 1896 1897 if (*ppos > len) 1898 return 0; 1899 len = *ppos; 1900 } else { 1901 /* Start writing from beginning of buffer. */ 1902 len = 0; 1903 } 1904 1905 *ppos += *lenp; 1906 p = buffer; 1907 while ((p - buffer) < *lenp && len < maxlen - 1) { 1908 if (get_user(c, p++)) 1909 return -EFAULT; 1910 if (c == 0 || c == '\n') 1911 break; 1912 data[len++] = c; 1913 } 1914 data[len] = 0; 1915 } else { 1916 len = strlen(data); 1917 if (len > maxlen) 1918 len = maxlen; 1919 1920 if (*ppos > len) { 1921 *lenp = 0; 1922 return 0; 1923 } 1924 1925 data += *ppos; 1926 len -= *ppos; 1927 1928 if (len > *lenp) 1929 len = *lenp; 1930 if (len) 1931 if (copy_to_user(buffer, data, len)) 1932 return -EFAULT; 1933 if (len < *lenp) { 1934 if (put_user('\n', buffer + len)) 1935 return -EFAULT; 1936 len++; 1937 } 1938 *lenp = len; 1939 *ppos += len; 1940 } 1941 return 0; 1942 } 1943 1944 static void warn_sysctl_write(struct ctl_table *table) 1945 { 1946 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1947 "This will not be supported in the future. To silence this\n" 1948 "warning, set kernel.sysctl_writes_strict = -1\n", 1949 current->comm, table->procname); 1950 } 1951 1952 /** 1953 * proc_dostring - read a string sysctl 1954 * @table: the sysctl table 1955 * @write: %TRUE if this is a write to the sysctl file 1956 * @buffer: the user buffer 1957 * @lenp: the size of the user buffer 1958 * @ppos: file position 1959 * 1960 * Reads/writes a string from/to the user buffer. If the kernel 1961 * buffer provided is not large enough to hold the string, the 1962 * string is truncated. The copied string is %NULL-terminated. 1963 * If the string is being read by the user process, it is copied 1964 * and a newline '\n' is added. It is truncated if the buffer is 1965 * not large enough. 1966 * 1967 * Returns 0 on success. 1968 */ 1969 int proc_dostring(struct ctl_table *table, int write, 1970 void __user *buffer, size_t *lenp, loff_t *ppos) 1971 { 1972 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN) 1973 warn_sysctl_write(table); 1974 1975 return _proc_do_string((char *)(table->data), table->maxlen, write, 1976 (char __user *)buffer, lenp, ppos); 1977 } 1978 1979 static size_t proc_skip_spaces(char **buf) 1980 { 1981 size_t ret; 1982 char *tmp = skip_spaces(*buf); 1983 ret = tmp - *buf; 1984 *buf = tmp; 1985 return ret; 1986 } 1987 1988 static void proc_skip_char(char **buf, size_t *size, const char v) 1989 { 1990 while (*size) { 1991 if (**buf != v) 1992 break; 1993 (*size)--; 1994 (*buf)++; 1995 } 1996 } 1997 1998 #define TMPBUFLEN 22 1999 /** 2000 * proc_get_long - reads an ASCII formatted integer from a user buffer 2001 * 2002 * @buf: a kernel buffer 2003 * @size: size of the kernel buffer 2004 * @val: this is where the number will be stored 2005 * @neg: set to %TRUE if number is negative 2006 * @perm_tr: a vector which contains the allowed trailers 2007 * @perm_tr_len: size of the perm_tr vector 2008 * @tr: pointer to store the trailer character 2009 * 2010 * In case of success %0 is returned and @buf and @size are updated with 2011 * the amount of bytes read. If @tr is non-NULL and a trailing 2012 * character exists (size is non-zero after returning from this 2013 * function), @tr is updated with the trailing character. 2014 */ 2015 static int proc_get_long(char **buf, size_t *size, 2016 unsigned long *val, bool *neg, 2017 const char *perm_tr, unsigned perm_tr_len, char *tr) 2018 { 2019 int len; 2020 char *p, tmp[TMPBUFLEN]; 2021 2022 if (!*size) 2023 return -EINVAL; 2024 2025 len = *size; 2026 if (len > TMPBUFLEN - 1) 2027 len = TMPBUFLEN - 1; 2028 2029 memcpy(tmp, *buf, len); 2030 2031 tmp[len] = 0; 2032 p = tmp; 2033 if (*p == '-' && *size > 1) { 2034 *neg = true; 2035 p++; 2036 } else 2037 *neg = false; 2038 if (!isdigit(*p)) 2039 return -EINVAL; 2040 2041 *val = simple_strtoul(p, &p, 0); 2042 2043 len = p - tmp; 2044 2045 /* We don't know if the next char is whitespace thus we may accept 2046 * invalid integers (e.g. 1234...a) or two integers instead of one 2047 * (e.g. 123...1). So lets not allow such large numbers. */ 2048 if (len == TMPBUFLEN - 1) 2049 return -EINVAL; 2050 2051 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2052 return -EINVAL; 2053 2054 if (tr && (len < *size)) 2055 *tr = *p; 2056 2057 *buf += len; 2058 *size -= len; 2059 2060 return 0; 2061 } 2062 2063 /** 2064 * proc_put_long - converts an integer to a decimal ASCII formatted string 2065 * 2066 * @buf: the user buffer 2067 * @size: the size of the user buffer 2068 * @val: the integer to be converted 2069 * @neg: sign of the number, %TRUE for negative 2070 * 2071 * In case of success %0 is returned and @buf and @size are updated with 2072 * the amount of bytes written. 2073 */ 2074 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2075 bool neg) 2076 { 2077 int len; 2078 char tmp[TMPBUFLEN], *p = tmp; 2079 2080 sprintf(p, "%s%lu", neg ? "-" : "", val); 2081 len = strlen(tmp); 2082 if (len > *size) 2083 len = *size; 2084 if (copy_to_user(*buf, tmp, len)) 2085 return -EFAULT; 2086 *size -= len; 2087 *buf += len; 2088 return 0; 2089 } 2090 #undef TMPBUFLEN 2091 2092 static int proc_put_char(void __user **buf, size_t *size, char c) 2093 { 2094 if (*size) { 2095 char __user **buffer = (char __user **)buf; 2096 if (put_user(c, *buffer)) 2097 return -EFAULT; 2098 (*size)--, (*buffer)++; 2099 *buf = *buffer; 2100 } 2101 return 0; 2102 } 2103 2104 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2105 int *valp, 2106 int write, void *data) 2107 { 2108 if (write) { 2109 if (*negp) { 2110 if (*lvalp > (unsigned long) INT_MAX + 1) 2111 return -EINVAL; 2112 *valp = -*lvalp; 2113 } else { 2114 if (*lvalp > (unsigned long) INT_MAX) 2115 return -EINVAL; 2116 *valp = *lvalp; 2117 } 2118 } else { 2119 int val = *valp; 2120 if (val < 0) { 2121 *negp = true; 2122 *lvalp = -(unsigned long)val; 2123 } else { 2124 *negp = false; 2125 *lvalp = (unsigned long)val; 2126 } 2127 } 2128 return 0; 2129 } 2130 2131 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp, 2132 int *valp, 2133 int write, void *data) 2134 { 2135 if (write) { 2136 if (*negp) 2137 return -EINVAL; 2138 if (*lvalp > UINT_MAX) 2139 return -EINVAL; 2140 *valp = *lvalp; 2141 } else { 2142 unsigned int val = *valp; 2143 *negp = false; 2144 *lvalp = (unsigned long)val; 2145 } 2146 return 0; 2147 } 2148 2149 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2150 2151 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2152 int write, void __user *buffer, 2153 size_t *lenp, loff_t *ppos, 2154 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2155 int write, void *data), 2156 void *data) 2157 { 2158 int *i, vleft, first = 1, err = 0; 2159 size_t left; 2160 char *kbuf = NULL, *p; 2161 2162 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2163 *lenp = 0; 2164 return 0; 2165 } 2166 2167 i = (int *) tbl_data; 2168 vleft = table->maxlen / sizeof(*i); 2169 left = *lenp; 2170 2171 if (!conv) 2172 conv = do_proc_dointvec_conv; 2173 2174 if (write) { 2175 if (*ppos) { 2176 switch (sysctl_writes_strict) { 2177 case SYSCTL_WRITES_STRICT: 2178 goto out; 2179 case SYSCTL_WRITES_WARN: 2180 warn_sysctl_write(table); 2181 break; 2182 default: 2183 break; 2184 } 2185 } 2186 2187 if (left > PAGE_SIZE - 1) 2188 left = PAGE_SIZE - 1; 2189 p = kbuf = memdup_user_nul(buffer, left); 2190 if (IS_ERR(kbuf)) 2191 return PTR_ERR(kbuf); 2192 } 2193 2194 for (; left && vleft--; i++, first=0) { 2195 unsigned long lval; 2196 bool neg; 2197 2198 if (write) { 2199 left -= proc_skip_spaces(&p); 2200 2201 if (!left) 2202 break; 2203 err = proc_get_long(&p, &left, &lval, &neg, 2204 proc_wspace_sep, 2205 sizeof(proc_wspace_sep), NULL); 2206 if (err) 2207 break; 2208 if (conv(&neg, &lval, i, 1, data)) { 2209 err = -EINVAL; 2210 break; 2211 } 2212 } else { 2213 if (conv(&neg, &lval, i, 0, data)) { 2214 err = -EINVAL; 2215 break; 2216 } 2217 if (!first) 2218 err = proc_put_char(&buffer, &left, '\t'); 2219 if (err) 2220 break; 2221 err = proc_put_long(&buffer, &left, lval, neg); 2222 if (err) 2223 break; 2224 } 2225 } 2226 2227 if (!write && !first && left && !err) 2228 err = proc_put_char(&buffer, &left, '\n'); 2229 if (write && !err && left) 2230 left -= proc_skip_spaces(&p); 2231 if (write) { 2232 kfree(kbuf); 2233 if (first) 2234 return err ? : -EINVAL; 2235 } 2236 *lenp -= left; 2237 out: 2238 *ppos += *lenp; 2239 return err; 2240 } 2241 2242 static int do_proc_dointvec(struct ctl_table *table, int write, 2243 void __user *buffer, size_t *lenp, loff_t *ppos, 2244 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2245 int write, void *data), 2246 void *data) 2247 { 2248 return __do_proc_dointvec(table->data, table, write, 2249 buffer, lenp, ppos, conv, data); 2250 } 2251 2252 /** 2253 * proc_dointvec - read a vector of integers 2254 * @table: the sysctl table 2255 * @write: %TRUE if this is a write to the sysctl file 2256 * @buffer: the user buffer 2257 * @lenp: the size of the user buffer 2258 * @ppos: file position 2259 * 2260 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2261 * values from/to the user buffer, treated as an ASCII string. 2262 * 2263 * Returns 0 on success. 2264 */ 2265 int proc_dointvec(struct ctl_table *table, int write, 2266 void __user *buffer, size_t *lenp, loff_t *ppos) 2267 { 2268 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2269 } 2270 2271 /** 2272 * proc_douintvec - read a vector of unsigned integers 2273 * @table: the sysctl table 2274 * @write: %TRUE if this is a write to the sysctl file 2275 * @buffer: the user buffer 2276 * @lenp: the size of the user buffer 2277 * @ppos: file position 2278 * 2279 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2280 * values from/to the user buffer, treated as an ASCII string. 2281 * 2282 * Returns 0 on success. 2283 */ 2284 int proc_douintvec(struct ctl_table *table, int write, 2285 void __user *buffer, size_t *lenp, loff_t *ppos) 2286 { 2287 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2288 do_proc_douintvec_conv, NULL); 2289 } 2290 2291 /* 2292 * Taint values can only be increased 2293 * This means we can safely use a temporary. 2294 */ 2295 static int proc_taint(struct ctl_table *table, int write, 2296 void __user *buffer, size_t *lenp, loff_t *ppos) 2297 { 2298 struct ctl_table t; 2299 unsigned long tmptaint = get_taint(); 2300 int err; 2301 2302 if (write && !capable(CAP_SYS_ADMIN)) 2303 return -EPERM; 2304 2305 t = *table; 2306 t.data = &tmptaint; 2307 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2308 if (err < 0) 2309 return err; 2310 2311 if (write) { 2312 /* 2313 * Poor man's atomic or. Not worth adding a primitive 2314 * to everyone's atomic.h for this 2315 */ 2316 int i; 2317 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2318 if ((tmptaint >> i) & 1) 2319 add_taint(i, LOCKDEP_STILL_OK); 2320 } 2321 } 2322 2323 return err; 2324 } 2325 2326 #ifdef CONFIG_PRINTK 2327 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2328 void __user *buffer, size_t *lenp, loff_t *ppos) 2329 { 2330 if (write && !capable(CAP_SYS_ADMIN)) 2331 return -EPERM; 2332 2333 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2334 } 2335 #endif 2336 2337 struct do_proc_dointvec_minmax_conv_param { 2338 int *min; 2339 int *max; 2340 }; 2341 2342 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2343 int *valp, 2344 int write, void *data) 2345 { 2346 struct do_proc_dointvec_minmax_conv_param *param = data; 2347 if (write) { 2348 int val = *negp ? -*lvalp : *lvalp; 2349 if ((param->min && *param->min > val) || 2350 (param->max && *param->max < val)) 2351 return -EINVAL; 2352 *valp = val; 2353 } else { 2354 int val = *valp; 2355 if (val < 0) { 2356 *negp = true; 2357 *lvalp = -(unsigned long)val; 2358 } else { 2359 *negp = false; 2360 *lvalp = (unsigned long)val; 2361 } 2362 } 2363 return 0; 2364 } 2365 2366 /** 2367 * proc_dointvec_minmax - read a vector of integers with min/max values 2368 * @table: the sysctl table 2369 * @write: %TRUE if this is a write to the sysctl file 2370 * @buffer: the user buffer 2371 * @lenp: the size of the user buffer 2372 * @ppos: file position 2373 * 2374 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2375 * values from/to the user buffer, treated as an ASCII string. 2376 * 2377 * This routine will ensure the values are within the range specified by 2378 * table->extra1 (min) and table->extra2 (max). 2379 * 2380 * Returns 0 on success. 2381 */ 2382 int proc_dointvec_minmax(struct ctl_table *table, int write, 2383 void __user *buffer, size_t *lenp, loff_t *ppos) 2384 { 2385 struct do_proc_dointvec_minmax_conv_param param = { 2386 .min = (int *) table->extra1, 2387 .max = (int *) table->extra2, 2388 }; 2389 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2390 do_proc_dointvec_minmax_conv, ¶m); 2391 } 2392 2393 static void validate_coredump_safety(void) 2394 { 2395 #ifdef CONFIG_COREDUMP 2396 if (suid_dumpable == SUID_DUMP_ROOT && 2397 core_pattern[0] != '/' && core_pattern[0] != '|') { 2398 printk(KERN_WARNING 2399 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2400 "Pipe handler or fully qualified core dump path required.\n" 2401 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2402 ); 2403 } 2404 #endif 2405 } 2406 2407 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2408 void __user *buffer, size_t *lenp, loff_t *ppos) 2409 { 2410 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2411 if (!error) 2412 validate_coredump_safety(); 2413 return error; 2414 } 2415 2416 #ifdef CONFIG_COREDUMP 2417 static int proc_dostring_coredump(struct ctl_table *table, int write, 2418 void __user *buffer, size_t *lenp, loff_t *ppos) 2419 { 2420 int error = proc_dostring(table, write, buffer, lenp, ppos); 2421 if (!error) 2422 validate_coredump_safety(); 2423 return error; 2424 } 2425 #endif 2426 2427 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2428 void __user *buffer, 2429 size_t *lenp, loff_t *ppos, 2430 unsigned long convmul, 2431 unsigned long convdiv) 2432 { 2433 unsigned long *i, *min, *max; 2434 int vleft, first = 1, err = 0; 2435 size_t left; 2436 char *kbuf = NULL, *p; 2437 2438 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2439 *lenp = 0; 2440 return 0; 2441 } 2442 2443 i = (unsigned long *) data; 2444 min = (unsigned long *) table->extra1; 2445 max = (unsigned long *) table->extra2; 2446 vleft = table->maxlen / sizeof(unsigned long); 2447 left = *lenp; 2448 2449 if (write) { 2450 if (*ppos) { 2451 switch (sysctl_writes_strict) { 2452 case SYSCTL_WRITES_STRICT: 2453 goto out; 2454 case SYSCTL_WRITES_WARN: 2455 warn_sysctl_write(table); 2456 break; 2457 default: 2458 break; 2459 } 2460 } 2461 2462 if (left > PAGE_SIZE - 1) 2463 left = PAGE_SIZE - 1; 2464 p = kbuf = memdup_user_nul(buffer, left); 2465 if (IS_ERR(kbuf)) 2466 return PTR_ERR(kbuf); 2467 } 2468 2469 for (; left && vleft--; i++, first = 0) { 2470 unsigned long val; 2471 2472 if (write) { 2473 bool neg; 2474 2475 left -= proc_skip_spaces(&p); 2476 2477 err = proc_get_long(&p, &left, &val, &neg, 2478 proc_wspace_sep, 2479 sizeof(proc_wspace_sep), NULL); 2480 if (err) 2481 break; 2482 if (neg) 2483 continue; 2484 val = convmul * val / convdiv; 2485 if ((min && val < *min) || (max && val > *max)) 2486 continue; 2487 *i = val; 2488 } else { 2489 val = convdiv * (*i) / convmul; 2490 if (!first) { 2491 err = proc_put_char(&buffer, &left, '\t'); 2492 if (err) 2493 break; 2494 } 2495 err = proc_put_long(&buffer, &left, val, false); 2496 if (err) 2497 break; 2498 } 2499 } 2500 2501 if (!write && !first && left && !err) 2502 err = proc_put_char(&buffer, &left, '\n'); 2503 if (write && !err) 2504 left -= proc_skip_spaces(&p); 2505 if (write) { 2506 kfree(kbuf); 2507 if (first) 2508 return err ? : -EINVAL; 2509 } 2510 *lenp -= left; 2511 out: 2512 *ppos += *lenp; 2513 return err; 2514 } 2515 2516 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2517 void __user *buffer, 2518 size_t *lenp, loff_t *ppos, 2519 unsigned long convmul, 2520 unsigned long convdiv) 2521 { 2522 return __do_proc_doulongvec_minmax(table->data, table, write, 2523 buffer, lenp, ppos, convmul, convdiv); 2524 } 2525 2526 /** 2527 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2528 * @table: the sysctl table 2529 * @write: %TRUE if this is a write to the sysctl file 2530 * @buffer: the user buffer 2531 * @lenp: the size of the user buffer 2532 * @ppos: file position 2533 * 2534 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2535 * values from/to the user buffer, treated as an ASCII string. 2536 * 2537 * This routine will ensure the values are within the range specified by 2538 * table->extra1 (min) and table->extra2 (max). 2539 * 2540 * Returns 0 on success. 2541 */ 2542 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2543 void __user *buffer, size_t *lenp, loff_t *ppos) 2544 { 2545 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2546 } 2547 2548 /** 2549 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2550 * @table: the sysctl table 2551 * @write: %TRUE if this is a write to the sysctl file 2552 * @buffer: the user buffer 2553 * @lenp: the size of the user buffer 2554 * @ppos: file position 2555 * 2556 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2557 * values from/to the user buffer, treated as an ASCII string. The values 2558 * are treated as milliseconds, and converted to jiffies when they are stored. 2559 * 2560 * This routine will ensure the values are within the range specified by 2561 * table->extra1 (min) and table->extra2 (max). 2562 * 2563 * Returns 0 on success. 2564 */ 2565 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2566 void __user *buffer, 2567 size_t *lenp, loff_t *ppos) 2568 { 2569 return do_proc_doulongvec_minmax(table, write, buffer, 2570 lenp, ppos, HZ, 1000l); 2571 } 2572 2573 2574 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2575 int *valp, 2576 int write, void *data) 2577 { 2578 if (write) { 2579 if (*lvalp > INT_MAX / HZ) 2580 return 1; 2581 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2582 } else { 2583 int val = *valp; 2584 unsigned long lval; 2585 if (val < 0) { 2586 *negp = true; 2587 lval = -(unsigned long)val; 2588 } else { 2589 *negp = false; 2590 lval = (unsigned long)val; 2591 } 2592 *lvalp = lval / HZ; 2593 } 2594 return 0; 2595 } 2596 2597 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2598 int *valp, 2599 int write, void *data) 2600 { 2601 if (write) { 2602 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2603 return 1; 2604 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2605 } else { 2606 int val = *valp; 2607 unsigned long lval; 2608 if (val < 0) { 2609 *negp = true; 2610 lval = -(unsigned long)val; 2611 } else { 2612 *negp = false; 2613 lval = (unsigned long)val; 2614 } 2615 *lvalp = jiffies_to_clock_t(lval); 2616 } 2617 return 0; 2618 } 2619 2620 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2621 int *valp, 2622 int write, void *data) 2623 { 2624 if (write) { 2625 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2626 2627 if (jif > INT_MAX) 2628 return 1; 2629 *valp = (int)jif; 2630 } else { 2631 int val = *valp; 2632 unsigned long lval; 2633 if (val < 0) { 2634 *negp = true; 2635 lval = -(unsigned long)val; 2636 } else { 2637 *negp = false; 2638 lval = (unsigned long)val; 2639 } 2640 *lvalp = jiffies_to_msecs(lval); 2641 } 2642 return 0; 2643 } 2644 2645 /** 2646 * proc_dointvec_jiffies - read a vector of integers as seconds 2647 * @table: the sysctl table 2648 * @write: %TRUE if this is a write to the sysctl file 2649 * @buffer: the user buffer 2650 * @lenp: the size of the user buffer 2651 * @ppos: file position 2652 * 2653 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2654 * values from/to the user buffer, treated as an ASCII string. 2655 * The values read are assumed to be in seconds, and are converted into 2656 * jiffies. 2657 * 2658 * Returns 0 on success. 2659 */ 2660 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2661 void __user *buffer, size_t *lenp, loff_t *ppos) 2662 { 2663 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2664 do_proc_dointvec_jiffies_conv,NULL); 2665 } 2666 2667 /** 2668 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2669 * @table: the sysctl table 2670 * @write: %TRUE if this is a write to the sysctl file 2671 * @buffer: the user buffer 2672 * @lenp: the size of the user buffer 2673 * @ppos: pointer to the file position 2674 * 2675 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2676 * values from/to the user buffer, treated as an ASCII string. 2677 * The values read are assumed to be in 1/USER_HZ seconds, and 2678 * are converted into jiffies. 2679 * 2680 * Returns 0 on success. 2681 */ 2682 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2683 void __user *buffer, size_t *lenp, loff_t *ppos) 2684 { 2685 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2686 do_proc_dointvec_userhz_jiffies_conv,NULL); 2687 } 2688 2689 /** 2690 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2691 * @table: the sysctl table 2692 * @write: %TRUE if this is a write to the sysctl file 2693 * @buffer: the user buffer 2694 * @lenp: the size of the user buffer 2695 * @ppos: file position 2696 * @ppos: the current position in the file 2697 * 2698 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2699 * values from/to the user buffer, treated as an ASCII string. 2700 * The values read are assumed to be in 1/1000 seconds, and 2701 * are converted into jiffies. 2702 * 2703 * Returns 0 on success. 2704 */ 2705 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2706 void __user *buffer, size_t *lenp, loff_t *ppos) 2707 { 2708 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2709 do_proc_dointvec_ms_jiffies_conv, NULL); 2710 } 2711 2712 static int proc_do_cad_pid(struct ctl_table *table, int write, 2713 void __user *buffer, size_t *lenp, loff_t *ppos) 2714 { 2715 struct pid *new_pid; 2716 pid_t tmp; 2717 int r; 2718 2719 tmp = pid_vnr(cad_pid); 2720 2721 r = __do_proc_dointvec(&tmp, table, write, buffer, 2722 lenp, ppos, NULL, NULL); 2723 if (r || !write) 2724 return r; 2725 2726 new_pid = find_get_pid(tmp); 2727 if (!new_pid) 2728 return -ESRCH; 2729 2730 put_pid(xchg(&cad_pid, new_pid)); 2731 return 0; 2732 } 2733 2734 /** 2735 * proc_do_large_bitmap - read/write from/to a large bitmap 2736 * @table: the sysctl table 2737 * @write: %TRUE if this is a write to the sysctl file 2738 * @buffer: the user buffer 2739 * @lenp: the size of the user buffer 2740 * @ppos: file position 2741 * 2742 * The bitmap is stored at table->data and the bitmap length (in bits) 2743 * in table->maxlen. 2744 * 2745 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2746 * large bitmaps may be represented in a compact manner. Writing into 2747 * the file will clear the bitmap then update it with the given input. 2748 * 2749 * Returns 0 on success. 2750 */ 2751 int proc_do_large_bitmap(struct ctl_table *table, int write, 2752 void __user *buffer, size_t *lenp, loff_t *ppos) 2753 { 2754 int err = 0; 2755 bool first = 1; 2756 size_t left = *lenp; 2757 unsigned long bitmap_len = table->maxlen; 2758 unsigned long *bitmap = *(unsigned long **) table->data; 2759 unsigned long *tmp_bitmap = NULL; 2760 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2761 2762 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2763 *lenp = 0; 2764 return 0; 2765 } 2766 2767 if (write) { 2768 char *kbuf, *p; 2769 2770 if (left > PAGE_SIZE - 1) 2771 left = PAGE_SIZE - 1; 2772 2773 p = kbuf = memdup_user_nul(buffer, left); 2774 if (IS_ERR(kbuf)) 2775 return PTR_ERR(kbuf); 2776 2777 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2778 GFP_KERNEL); 2779 if (!tmp_bitmap) { 2780 kfree(kbuf); 2781 return -ENOMEM; 2782 } 2783 proc_skip_char(&p, &left, '\n'); 2784 while (!err && left) { 2785 unsigned long val_a, val_b; 2786 bool neg; 2787 2788 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 2789 sizeof(tr_a), &c); 2790 if (err) 2791 break; 2792 if (val_a >= bitmap_len || neg) { 2793 err = -EINVAL; 2794 break; 2795 } 2796 2797 val_b = val_a; 2798 if (left) { 2799 p++; 2800 left--; 2801 } 2802 2803 if (c == '-') { 2804 err = proc_get_long(&p, &left, &val_b, 2805 &neg, tr_b, sizeof(tr_b), 2806 &c); 2807 if (err) 2808 break; 2809 if (val_b >= bitmap_len || neg || 2810 val_a > val_b) { 2811 err = -EINVAL; 2812 break; 2813 } 2814 if (left) { 2815 p++; 2816 left--; 2817 } 2818 } 2819 2820 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 2821 first = 0; 2822 proc_skip_char(&p, &left, '\n'); 2823 } 2824 kfree(kbuf); 2825 } else { 2826 unsigned long bit_a, bit_b = 0; 2827 2828 while (left) { 2829 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2830 if (bit_a >= bitmap_len) 2831 break; 2832 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2833 bit_a + 1) - 1; 2834 2835 if (!first) { 2836 err = proc_put_char(&buffer, &left, ','); 2837 if (err) 2838 break; 2839 } 2840 err = proc_put_long(&buffer, &left, bit_a, false); 2841 if (err) 2842 break; 2843 if (bit_a != bit_b) { 2844 err = proc_put_char(&buffer, &left, '-'); 2845 if (err) 2846 break; 2847 err = proc_put_long(&buffer, &left, bit_b, false); 2848 if (err) 2849 break; 2850 } 2851 2852 first = 0; bit_b++; 2853 } 2854 if (!err) 2855 err = proc_put_char(&buffer, &left, '\n'); 2856 } 2857 2858 if (!err) { 2859 if (write) { 2860 if (*ppos) 2861 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2862 else 2863 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 2864 } 2865 kfree(tmp_bitmap); 2866 *lenp -= left; 2867 *ppos += *lenp; 2868 return 0; 2869 } else { 2870 kfree(tmp_bitmap); 2871 return err; 2872 } 2873 } 2874 2875 #else /* CONFIG_PROC_SYSCTL */ 2876 2877 int proc_dostring(struct ctl_table *table, int write, 2878 void __user *buffer, size_t *lenp, loff_t *ppos) 2879 { 2880 return -ENOSYS; 2881 } 2882 2883 int proc_dointvec(struct ctl_table *table, int write, 2884 void __user *buffer, size_t *lenp, loff_t *ppos) 2885 { 2886 return -ENOSYS; 2887 } 2888 2889 int proc_douintvec(struct ctl_table *table, int write, 2890 void __user *buffer, size_t *lenp, loff_t *ppos) 2891 { 2892 return -ENOSYS; 2893 } 2894 2895 int proc_dointvec_minmax(struct ctl_table *table, int write, 2896 void __user *buffer, size_t *lenp, loff_t *ppos) 2897 { 2898 return -ENOSYS; 2899 } 2900 2901 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2902 void __user *buffer, size_t *lenp, loff_t *ppos) 2903 { 2904 return -ENOSYS; 2905 } 2906 2907 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2908 void __user *buffer, size_t *lenp, loff_t *ppos) 2909 { 2910 return -ENOSYS; 2911 } 2912 2913 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2914 void __user *buffer, size_t *lenp, loff_t *ppos) 2915 { 2916 return -ENOSYS; 2917 } 2918 2919 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2920 void __user *buffer, size_t *lenp, loff_t *ppos) 2921 { 2922 return -ENOSYS; 2923 } 2924 2925 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2926 void __user *buffer, 2927 size_t *lenp, loff_t *ppos) 2928 { 2929 return -ENOSYS; 2930 } 2931 2932 2933 #endif /* CONFIG_PROC_SYSCTL */ 2934 2935 /* 2936 * No sense putting this after each symbol definition, twice, 2937 * exception granted :-) 2938 */ 2939 EXPORT_SYMBOL(proc_dointvec); 2940 EXPORT_SYMBOL(proc_douintvec); 2941 EXPORT_SYMBOL(proc_dointvec_jiffies); 2942 EXPORT_SYMBOL(proc_dointvec_minmax); 2943 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2944 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2945 EXPORT_SYMBOL(proc_dostring); 2946 EXPORT_SYMBOL(proc_doulongvec_minmax); 2947 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2948