1 /* 2 * sysctl.c: General linux system control interface 3 * 4 * Begun 24 March 1995, Stephen Tweedie 5 * Added /proc support, Dec 1995 6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. 7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. 8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. 9 * Dynamic registration fixes, Stephen Tweedie. 10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. 11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris 12 * Horn. 13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. 14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. 15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill 16 * Wendling. 17 * The list_for_each() macro wasn't appropriate for the sysctl loop. 18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling 19 */ 20 21 #include <linux/module.h> 22 #include <linux/mm.h> 23 #include <linux/swap.h> 24 #include <linux/slab.h> 25 #include <linux/sysctl.h> 26 #include <linux/signal.h> 27 #include <linux/printk.h> 28 #include <linux/proc_fs.h> 29 #include <linux/security.h> 30 #include <linux/ctype.h> 31 #include <linux/kmemcheck.h> 32 #include <linux/fs.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/ratelimit.h> 41 #include <linux/compaction.h> 42 #include <linux/hugetlb.h> 43 #include <linux/initrd.h> 44 #include <linux/key.h> 45 #include <linux/times.h> 46 #include <linux/limits.h> 47 #include <linux/dcache.h> 48 #include <linux/dnotify.h> 49 #include <linux/syscalls.h> 50 #include <linux/vmstat.h> 51 #include <linux/nfs_fs.h> 52 #include <linux/acpi.h> 53 #include <linux/reboot.h> 54 #include <linux/ftrace.h> 55 #include <linux/perf_event.h> 56 #include <linux/kprobes.h> 57 #include <linux/pipe_fs_i.h> 58 #include <linux/oom.h> 59 #include <linux/kmod.h> 60 #include <linux/capability.h> 61 #include <linux/binfmts.h> 62 63 #include <asm/uaccess.h> 64 #include <asm/processor.h> 65 66 #ifdef CONFIG_X86 67 #include <asm/nmi.h> 68 #include <asm/stacktrace.h> 69 #include <asm/io.h> 70 #endif 71 #ifdef CONFIG_SPARC 72 #include <asm/setup.h> 73 #endif 74 #ifdef CONFIG_BSD_PROCESS_ACCT 75 #include <linux/acct.h> 76 #endif 77 #ifdef CONFIG_RT_MUTEXES 78 #include <linux/rtmutex.h> 79 #endif 80 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 81 #include <linux/lockdep.h> 82 #endif 83 #ifdef CONFIG_CHR_DEV_SG 84 #include <scsi/sg.h> 85 #endif 86 87 #ifdef CONFIG_LOCKUP_DETECTOR 88 #include <linux/nmi.h> 89 #endif 90 91 92 #if defined(CONFIG_SYSCTL) 93 94 /* External variables not in a header file. */ 95 extern int sysctl_overcommit_memory; 96 extern int sysctl_overcommit_ratio; 97 extern int max_threads; 98 extern int core_uses_pid; 99 extern int suid_dumpable; 100 extern char core_pattern[]; 101 extern unsigned int core_pipe_limit; 102 extern int pid_max; 103 extern int min_free_kbytes; 104 extern int pid_max_min, pid_max_max; 105 extern int sysctl_drop_caches; 106 extern int percpu_pagelist_fraction; 107 extern int compat_log; 108 extern int latencytop_enabled; 109 extern int sysctl_nr_open_min, sysctl_nr_open_max; 110 #ifndef CONFIG_MMU 111 extern int sysctl_nr_trim_pages; 112 #endif 113 #ifdef CONFIG_BLOCK 114 extern int blk_iopoll_enabled; 115 #endif 116 117 /* Constants used for minimum and maximum */ 118 #ifdef CONFIG_LOCKUP_DETECTOR 119 static int sixty = 60; 120 static int neg_one = -1; 121 #endif 122 123 static int zero; 124 static int __maybe_unused one = 1; 125 static int __maybe_unused two = 2; 126 static int __maybe_unused three = 3; 127 static unsigned long one_ul = 1; 128 static int one_hundred = 100; 129 #ifdef CONFIG_PRINTK 130 static int ten_thousand = 10000; 131 #endif 132 133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 135 136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 137 static int maxolduid = 65535; 138 static int minolduid; 139 static int min_percpu_pagelist_fract = 8; 140 141 static int ngroups_max = NGROUPS_MAX; 142 static const int cap_last_cap = CAP_LAST_CAP; 143 144 #ifdef CONFIG_INOTIFY_USER 145 #include <linux/inotify.h> 146 #endif 147 #ifdef CONFIG_SPARC 148 #endif 149 150 #ifdef CONFIG_SPARC64 151 extern int sysctl_tsb_ratio; 152 #endif 153 154 #ifdef __hppa__ 155 extern int pwrsw_enabled; 156 extern int unaligned_enabled; 157 #endif 158 159 #ifdef CONFIG_IA64 160 extern int no_unaligned_warning; 161 extern int unaligned_dump_stack; 162 #endif 163 164 #ifdef CONFIG_PROC_SYSCTL 165 static int proc_do_cad_pid(struct ctl_table *table, int write, 166 void __user *buffer, size_t *lenp, loff_t *ppos); 167 static int proc_taint(struct ctl_table *table, int write, 168 void __user *buffer, size_t *lenp, loff_t *ppos); 169 #endif 170 171 #ifdef CONFIG_PRINTK 172 static int proc_dmesg_restrict(struct ctl_table *table, int write, 173 void __user *buffer, size_t *lenp, loff_t *ppos); 174 #endif 175 176 #ifdef CONFIG_MAGIC_SYSRQ 177 /* Note: sysrq code uses it's own private copy */ 178 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE; 179 180 static int sysrq_sysctl_handler(ctl_table *table, int write, 181 void __user *buffer, size_t *lenp, 182 loff_t *ppos) 183 { 184 int error; 185 186 error = proc_dointvec(table, write, buffer, lenp, ppos); 187 if (error) 188 return error; 189 190 if (write) 191 sysrq_toggle_support(__sysrq_enabled); 192 193 return 0; 194 } 195 196 #endif 197 198 static struct ctl_table root_table[]; 199 static struct ctl_table_root sysctl_table_root; 200 static struct ctl_table_header root_table_header = { 201 {{.count = 1, 202 .ctl_table = root_table, 203 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}}, 204 .root = &sysctl_table_root, 205 .set = &sysctl_table_root.default_set, 206 }; 207 static struct ctl_table_root sysctl_table_root = { 208 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 209 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 210 }; 211 212 static struct ctl_table kern_table[]; 213 static struct ctl_table vm_table[]; 214 static struct ctl_table fs_table[]; 215 static struct ctl_table debug_table[]; 216 static struct ctl_table dev_table[]; 217 extern struct ctl_table random_table[]; 218 #ifdef CONFIG_EPOLL 219 extern struct ctl_table epoll_table[]; 220 #endif 221 222 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 223 int sysctl_legacy_va_layout; 224 #endif 225 226 /* The default sysctl tables: */ 227 228 static struct ctl_table root_table[] = { 229 { 230 .procname = "kernel", 231 .mode = 0555, 232 .child = kern_table, 233 }, 234 { 235 .procname = "vm", 236 .mode = 0555, 237 .child = vm_table, 238 }, 239 { 240 .procname = "fs", 241 .mode = 0555, 242 .child = fs_table, 243 }, 244 { 245 .procname = "debug", 246 .mode = 0555, 247 .child = debug_table, 248 }, 249 { 250 .procname = "dev", 251 .mode = 0555, 252 .child = dev_table, 253 }, 254 { } 255 }; 256 257 #ifdef CONFIG_SCHED_DEBUG 258 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 259 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 260 static int min_wakeup_granularity_ns; /* 0 usecs */ 261 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 262 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 263 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 264 #endif 265 266 #ifdef CONFIG_COMPACTION 267 static int min_extfrag_threshold; 268 static int max_extfrag_threshold = 1000; 269 #endif 270 271 static struct ctl_table kern_table[] = { 272 { 273 .procname = "sched_child_runs_first", 274 .data = &sysctl_sched_child_runs_first, 275 .maxlen = sizeof(unsigned int), 276 .mode = 0644, 277 .proc_handler = proc_dointvec, 278 }, 279 #ifdef CONFIG_SCHED_DEBUG 280 { 281 .procname = "sched_min_granularity_ns", 282 .data = &sysctl_sched_min_granularity, 283 .maxlen = sizeof(unsigned int), 284 .mode = 0644, 285 .proc_handler = sched_proc_update_handler, 286 .extra1 = &min_sched_granularity_ns, 287 .extra2 = &max_sched_granularity_ns, 288 }, 289 { 290 .procname = "sched_latency_ns", 291 .data = &sysctl_sched_latency, 292 .maxlen = sizeof(unsigned int), 293 .mode = 0644, 294 .proc_handler = sched_proc_update_handler, 295 .extra1 = &min_sched_granularity_ns, 296 .extra2 = &max_sched_granularity_ns, 297 }, 298 { 299 .procname = "sched_wakeup_granularity_ns", 300 .data = &sysctl_sched_wakeup_granularity, 301 .maxlen = sizeof(unsigned int), 302 .mode = 0644, 303 .proc_handler = sched_proc_update_handler, 304 .extra1 = &min_wakeup_granularity_ns, 305 .extra2 = &max_wakeup_granularity_ns, 306 }, 307 { 308 .procname = "sched_tunable_scaling", 309 .data = &sysctl_sched_tunable_scaling, 310 .maxlen = sizeof(enum sched_tunable_scaling), 311 .mode = 0644, 312 .proc_handler = sched_proc_update_handler, 313 .extra1 = &min_sched_tunable_scaling, 314 .extra2 = &max_sched_tunable_scaling, 315 }, 316 { 317 .procname = "sched_migration_cost", 318 .data = &sysctl_sched_migration_cost, 319 .maxlen = sizeof(unsigned int), 320 .mode = 0644, 321 .proc_handler = proc_dointvec, 322 }, 323 { 324 .procname = "sched_nr_migrate", 325 .data = &sysctl_sched_nr_migrate, 326 .maxlen = sizeof(unsigned int), 327 .mode = 0644, 328 .proc_handler = proc_dointvec, 329 }, 330 { 331 .procname = "sched_time_avg", 332 .data = &sysctl_sched_time_avg, 333 .maxlen = sizeof(unsigned int), 334 .mode = 0644, 335 .proc_handler = proc_dointvec, 336 }, 337 { 338 .procname = "sched_shares_window", 339 .data = &sysctl_sched_shares_window, 340 .maxlen = sizeof(unsigned int), 341 .mode = 0644, 342 .proc_handler = proc_dointvec, 343 }, 344 { 345 .procname = "timer_migration", 346 .data = &sysctl_timer_migration, 347 .maxlen = sizeof(unsigned int), 348 .mode = 0644, 349 .proc_handler = proc_dointvec_minmax, 350 .extra1 = &zero, 351 .extra2 = &one, 352 }, 353 #endif 354 { 355 .procname = "sched_rt_period_us", 356 .data = &sysctl_sched_rt_period, 357 .maxlen = sizeof(unsigned int), 358 .mode = 0644, 359 .proc_handler = sched_rt_handler, 360 }, 361 { 362 .procname = "sched_rt_runtime_us", 363 .data = &sysctl_sched_rt_runtime, 364 .maxlen = sizeof(int), 365 .mode = 0644, 366 .proc_handler = sched_rt_handler, 367 }, 368 #ifdef CONFIG_SCHED_AUTOGROUP 369 { 370 .procname = "sched_autogroup_enabled", 371 .data = &sysctl_sched_autogroup_enabled, 372 .maxlen = sizeof(unsigned int), 373 .mode = 0644, 374 .proc_handler = proc_dointvec_minmax, 375 .extra1 = &zero, 376 .extra2 = &one, 377 }, 378 #endif 379 #ifdef CONFIG_CFS_BANDWIDTH 380 { 381 .procname = "sched_cfs_bandwidth_slice_us", 382 .data = &sysctl_sched_cfs_bandwidth_slice, 383 .maxlen = sizeof(unsigned int), 384 .mode = 0644, 385 .proc_handler = proc_dointvec_minmax, 386 .extra1 = &one, 387 }, 388 #endif 389 #ifdef CONFIG_PROVE_LOCKING 390 { 391 .procname = "prove_locking", 392 .data = &prove_locking, 393 .maxlen = sizeof(int), 394 .mode = 0644, 395 .proc_handler = proc_dointvec, 396 }, 397 #endif 398 #ifdef CONFIG_LOCK_STAT 399 { 400 .procname = "lock_stat", 401 .data = &lock_stat, 402 .maxlen = sizeof(int), 403 .mode = 0644, 404 .proc_handler = proc_dointvec, 405 }, 406 #endif 407 { 408 .procname = "panic", 409 .data = &panic_timeout, 410 .maxlen = sizeof(int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec, 413 }, 414 { 415 .procname = "core_uses_pid", 416 .data = &core_uses_pid, 417 .maxlen = sizeof(int), 418 .mode = 0644, 419 .proc_handler = proc_dointvec, 420 }, 421 { 422 .procname = "core_pattern", 423 .data = core_pattern, 424 .maxlen = CORENAME_MAX_SIZE, 425 .mode = 0644, 426 .proc_handler = proc_dostring, 427 }, 428 { 429 .procname = "core_pipe_limit", 430 .data = &core_pipe_limit, 431 .maxlen = sizeof(unsigned int), 432 .mode = 0644, 433 .proc_handler = proc_dointvec, 434 }, 435 #ifdef CONFIG_PROC_SYSCTL 436 { 437 .procname = "tainted", 438 .maxlen = sizeof(long), 439 .mode = 0644, 440 .proc_handler = proc_taint, 441 }, 442 #endif 443 #ifdef CONFIG_LATENCYTOP 444 { 445 .procname = "latencytop", 446 .data = &latencytop_enabled, 447 .maxlen = sizeof(int), 448 .mode = 0644, 449 .proc_handler = proc_dointvec, 450 }, 451 #endif 452 #ifdef CONFIG_BLK_DEV_INITRD 453 { 454 .procname = "real-root-dev", 455 .data = &real_root_dev, 456 .maxlen = sizeof(int), 457 .mode = 0644, 458 .proc_handler = proc_dointvec, 459 }, 460 #endif 461 { 462 .procname = "print-fatal-signals", 463 .data = &print_fatal_signals, 464 .maxlen = sizeof(int), 465 .mode = 0644, 466 .proc_handler = proc_dointvec, 467 }, 468 #ifdef CONFIG_SPARC 469 { 470 .procname = "reboot-cmd", 471 .data = reboot_command, 472 .maxlen = 256, 473 .mode = 0644, 474 .proc_handler = proc_dostring, 475 }, 476 { 477 .procname = "stop-a", 478 .data = &stop_a_enabled, 479 .maxlen = sizeof (int), 480 .mode = 0644, 481 .proc_handler = proc_dointvec, 482 }, 483 { 484 .procname = "scons-poweroff", 485 .data = &scons_pwroff, 486 .maxlen = sizeof (int), 487 .mode = 0644, 488 .proc_handler = proc_dointvec, 489 }, 490 #endif 491 #ifdef CONFIG_SPARC64 492 { 493 .procname = "tsb-ratio", 494 .data = &sysctl_tsb_ratio, 495 .maxlen = sizeof (int), 496 .mode = 0644, 497 .proc_handler = proc_dointvec, 498 }, 499 #endif 500 #ifdef __hppa__ 501 { 502 .procname = "soft-power", 503 .data = &pwrsw_enabled, 504 .maxlen = sizeof (int), 505 .mode = 0644, 506 .proc_handler = proc_dointvec, 507 }, 508 { 509 .procname = "unaligned-trap", 510 .data = &unaligned_enabled, 511 .maxlen = sizeof (int), 512 .mode = 0644, 513 .proc_handler = proc_dointvec, 514 }, 515 #endif 516 { 517 .procname = "ctrl-alt-del", 518 .data = &C_A_D, 519 .maxlen = sizeof(int), 520 .mode = 0644, 521 .proc_handler = proc_dointvec, 522 }, 523 #ifdef CONFIG_FUNCTION_TRACER 524 { 525 .procname = "ftrace_enabled", 526 .data = &ftrace_enabled, 527 .maxlen = sizeof(int), 528 .mode = 0644, 529 .proc_handler = ftrace_enable_sysctl, 530 }, 531 #endif 532 #ifdef CONFIG_STACK_TRACER 533 { 534 .procname = "stack_tracer_enabled", 535 .data = &stack_tracer_enabled, 536 .maxlen = sizeof(int), 537 .mode = 0644, 538 .proc_handler = stack_trace_sysctl, 539 }, 540 #endif 541 #ifdef CONFIG_TRACING 542 { 543 .procname = "ftrace_dump_on_oops", 544 .data = &ftrace_dump_on_oops, 545 .maxlen = sizeof(int), 546 .mode = 0644, 547 .proc_handler = proc_dointvec, 548 }, 549 #endif 550 #ifdef CONFIG_MODULES 551 { 552 .procname = "modprobe", 553 .data = &modprobe_path, 554 .maxlen = KMOD_PATH_LEN, 555 .mode = 0644, 556 .proc_handler = proc_dostring, 557 }, 558 { 559 .procname = "modules_disabled", 560 .data = &modules_disabled, 561 .maxlen = sizeof(int), 562 .mode = 0644, 563 /* only handle a transition from default "0" to "1" */ 564 .proc_handler = proc_dointvec_minmax, 565 .extra1 = &one, 566 .extra2 = &one, 567 }, 568 #endif 569 #ifdef CONFIG_HOTPLUG 570 { 571 .procname = "hotplug", 572 .data = &uevent_helper, 573 .maxlen = UEVENT_HELPER_PATH_LEN, 574 .mode = 0644, 575 .proc_handler = proc_dostring, 576 }, 577 #endif 578 #ifdef CONFIG_CHR_DEV_SG 579 { 580 .procname = "sg-big-buff", 581 .data = &sg_big_buff, 582 .maxlen = sizeof (int), 583 .mode = 0444, 584 .proc_handler = proc_dointvec, 585 }, 586 #endif 587 #ifdef CONFIG_BSD_PROCESS_ACCT 588 { 589 .procname = "acct", 590 .data = &acct_parm, 591 .maxlen = 3*sizeof(int), 592 .mode = 0644, 593 .proc_handler = proc_dointvec, 594 }, 595 #endif 596 #ifdef CONFIG_MAGIC_SYSRQ 597 { 598 .procname = "sysrq", 599 .data = &__sysrq_enabled, 600 .maxlen = sizeof (int), 601 .mode = 0644, 602 .proc_handler = sysrq_sysctl_handler, 603 }, 604 #endif 605 #ifdef CONFIG_PROC_SYSCTL 606 { 607 .procname = "cad_pid", 608 .data = NULL, 609 .maxlen = sizeof (int), 610 .mode = 0600, 611 .proc_handler = proc_do_cad_pid, 612 }, 613 #endif 614 { 615 .procname = "threads-max", 616 .data = &max_threads, 617 .maxlen = sizeof(int), 618 .mode = 0644, 619 .proc_handler = proc_dointvec, 620 }, 621 { 622 .procname = "random", 623 .mode = 0555, 624 .child = random_table, 625 }, 626 { 627 .procname = "usermodehelper", 628 .mode = 0555, 629 .child = usermodehelper_table, 630 }, 631 { 632 .procname = "overflowuid", 633 .data = &overflowuid, 634 .maxlen = sizeof(int), 635 .mode = 0644, 636 .proc_handler = proc_dointvec_minmax, 637 .extra1 = &minolduid, 638 .extra2 = &maxolduid, 639 }, 640 { 641 .procname = "overflowgid", 642 .data = &overflowgid, 643 .maxlen = sizeof(int), 644 .mode = 0644, 645 .proc_handler = proc_dointvec_minmax, 646 .extra1 = &minolduid, 647 .extra2 = &maxolduid, 648 }, 649 #ifdef CONFIG_S390 650 #ifdef CONFIG_MATHEMU 651 { 652 .procname = "ieee_emulation_warnings", 653 .data = &sysctl_ieee_emulation_warnings, 654 .maxlen = sizeof(int), 655 .mode = 0644, 656 .proc_handler = proc_dointvec, 657 }, 658 #endif 659 { 660 .procname = "userprocess_debug", 661 .data = &show_unhandled_signals, 662 .maxlen = sizeof(int), 663 .mode = 0644, 664 .proc_handler = proc_dointvec, 665 }, 666 #endif 667 { 668 .procname = "pid_max", 669 .data = &pid_max, 670 .maxlen = sizeof (int), 671 .mode = 0644, 672 .proc_handler = proc_dointvec_minmax, 673 .extra1 = &pid_max_min, 674 .extra2 = &pid_max_max, 675 }, 676 { 677 .procname = "panic_on_oops", 678 .data = &panic_on_oops, 679 .maxlen = sizeof(int), 680 .mode = 0644, 681 .proc_handler = proc_dointvec, 682 }, 683 #if defined CONFIG_PRINTK 684 { 685 .procname = "printk", 686 .data = &console_loglevel, 687 .maxlen = 4*sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec, 690 }, 691 { 692 .procname = "printk_ratelimit", 693 .data = &printk_ratelimit_state.interval, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_dointvec_jiffies, 697 }, 698 { 699 .procname = "printk_ratelimit_burst", 700 .data = &printk_ratelimit_state.burst, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_dointvec, 704 }, 705 { 706 .procname = "printk_delay", 707 .data = &printk_delay_msec, 708 .maxlen = sizeof(int), 709 .mode = 0644, 710 .proc_handler = proc_dointvec_minmax, 711 .extra1 = &zero, 712 .extra2 = &ten_thousand, 713 }, 714 { 715 .procname = "dmesg_restrict", 716 .data = &dmesg_restrict, 717 .maxlen = sizeof(int), 718 .mode = 0644, 719 .proc_handler = proc_dointvec_minmax, 720 .extra1 = &zero, 721 .extra2 = &one, 722 }, 723 { 724 .procname = "kptr_restrict", 725 .data = &kptr_restrict, 726 .maxlen = sizeof(int), 727 .mode = 0644, 728 .proc_handler = proc_dmesg_restrict, 729 .extra1 = &zero, 730 .extra2 = &two, 731 }, 732 #endif 733 { 734 .procname = "ngroups_max", 735 .data = &ngroups_max, 736 .maxlen = sizeof (int), 737 .mode = 0444, 738 .proc_handler = proc_dointvec, 739 }, 740 { 741 .procname = "cap_last_cap", 742 .data = (void *)&cap_last_cap, 743 .maxlen = sizeof(int), 744 .mode = 0444, 745 .proc_handler = proc_dointvec, 746 }, 747 #if defined(CONFIG_LOCKUP_DETECTOR) 748 { 749 .procname = "watchdog", 750 .data = &watchdog_enabled, 751 .maxlen = sizeof (int), 752 .mode = 0644, 753 .proc_handler = proc_dowatchdog, 754 .extra1 = &zero, 755 .extra2 = &one, 756 }, 757 { 758 .procname = "watchdog_thresh", 759 .data = &watchdog_thresh, 760 .maxlen = sizeof(int), 761 .mode = 0644, 762 .proc_handler = proc_dowatchdog, 763 .extra1 = &neg_one, 764 .extra2 = &sixty, 765 }, 766 { 767 .procname = "softlockup_panic", 768 .data = &softlockup_panic, 769 .maxlen = sizeof(int), 770 .mode = 0644, 771 .proc_handler = proc_dointvec_minmax, 772 .extra1 = &zero, 773 .extra2 = &one, 774 }, 775 { 776 .procname = "nmi_watchdog", 777 .data = &watchdog_enabled, 778 .maxlen = sizeof (int), 779 .mode = 0644, 780 .proc_handler = proc_dowatchdog, 781 .extra1 = &zero, 782 .extra2 = &one, 783 }, 784 #endif 785 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 786 { 787 .procname = "unknown_nmi_panic", 788 .data = &unknown_nmi_panic, 789 .maxlen = sizeof (int), 790 .mode = 0644, 791 .proc_handler = proc_dointvec, 792 }, 793 #endif 794 #if defined(CONFIG_X86) 795 { 796 .procname = "panic_on_unrecovered_nmi", 797 .data = &panic_on_unrecovered_nmi, 798 .maxlen = sizeof(int), 799 .mode = 0644, 800 .proc_handler = proc_dointvec, 801 }, 802 { 803 .procname = "panic_on_io_nmi", 804 .data = &panic_on_io_nmi, 805 .maxlen = sizeof(int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec, 808 }, 809 #ifdef CONFIG_DEBUG_STACKOVERFLOW 810 { 811 .procname = "panic_on_stackoverflow", 812 .data = &sysctl_panic_on_stackoverflow, 813 .maxlen = sizeof(int), 814 .mode = 0644, 815 .proc_handler = proc_dointvec, 816 }, 817 #endif 818 { 819 .procname = "bootloader_type", 820 .data = &bootloader_type, 821 .maxlen = sizeof (int), 822 .mode = 0444, 823 .proc_handler = proc_dointvec, 824 }, 825 { 826 .procname = "bootloader_version", 827 .data = &bootloader_version, 828 .maxlen = sizeof (int), 829 .mode = 0444, 830 .proc_handler = proc_dointvec, 831 }, 832 { 833 .procname = "kstack_depth_to_print", 834 .data = &kstack_depth_to_print, 835 .maxlen = sizeof(int), 836 .mode = 0644, 837 .proc_handler = proc_dointvec, 838 }, 839 { 840 .procname = "io_delay_type", 841 .data = &io_delay_type, 842 .maxlen = sizeof(int), 843 .mode = 0644, 844 .proc_handler = proc_dointvec, 845 }, 846 #endif 847 #if defined(CONFIG_MMU) 848 { 849 .procname = "randomize_va_space", 850 .data = &randomize_va_space, 851 .maxlen = sizeof(int), 852 .mode = 0644, 853 .proc_handler = proc_dointvec, 854 }, 855 #endif 856 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 857 { 858 .procname = "spin_retry", 859 .data = &spin_retry, 860 .maxlen = sizeof (int), 861 .mode = 0644, 862 .proc_handler = proc_dointvec, 863 }, 864 #endif 865 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 866 { 867 .procname = "acpi_video_flags", 868 .data = &acpi_realmode_flags, 869 .maxlen = sizeof (unsigned long), 870 .mode = 0644, 871 .proc_handler = proc_doulongvec_minmax, 872 }, 873 #endif 874 #ifdef CONFIG_IA64 875 { 876 .procname = "ignore-unaligned-usertrap", 877 .data = &no_unaligned_warning, 878 .maxlen = sizeof (int), 879 .mode = 0644, 880 .proc_handler = proc_dointvec, 881 }, 882 { 883 .procname = "unaligned-dump-stack", 884 .data = &unaligned_dump_stack, 885 .maxlen = sizeof (int), 886 .mode = 0644, 887 .proc_handler = proc_dointvec, 888 }, 889 #endif 890 #ifdef CONFIG_DETECT_HUNG_TASK 891 { 892 .procname = "hung_task_panic", 893 .data = &sysctl_hung_task_panic, 894 .maxlen = sizeof(int), 895 .mode = 0644, 896 .proc_handler = proc_dointvec_minmax, 897 .extra1 = &zero, 898 .extra2 = &one, 899 }, 900 { 901 .procname = "hung_task_check_count", 902 .data = &sysctl_hung_task_check_count, 903 .maxlen = sizeof(unsigned long), 904 .mode = 0644, 905 .proc_handler = proc_doulongvec_minmax, 906 }, 907 { 908 .procname = "hung_task_timeout_secs", 909 .data = &sysctl_hung_task_timeout_secs, 910 .maxlen = sizeof(unsigned long), 911 .mode = 0644, 912 .proc_handler = proc_dohung_task_timeout_secs, 913 }, 914 { 915 .procname = "hung_task_warnings", 916 .data = &sysctl_hung_task_warnings, 917 .maxlen = sizeof(unsigned long), 918 .mode = 0644, 919 .proc_handler = proc_doulongvec_minmax, 920 }, 921 #endif 922 #ifdef CONFIG_COMPAT 923 { 924 .procname = "compat-log", 925 .data = &compat_log, 926 .maxlen = sizeof (int), 927 .mode = 0644, 928 .proc_handler = proc_dointvec, 929 }, 930 #endif 931 #ifdef CONFIG_RT_MUTEXES 932 { 933 .procname = "max_lock_depth", 934 .data = &max_lock_depth, 935 .maxlen = sizeof(int), 936 .mode = 0644, 937 .proc_handler = proc_dointvec, 938 }, 939 #endif 940 { 941 .procname = "poweroff_cmd", 942 .data = &poweroff_cmd, 943 .maxlen = POWEROFF_CMD_PATH_LEN, 944 .mode = 0644, 945 .proc_handler = proc_dostring, 946 }, 947 #ifdef CONFIG_KEYS 948 { 949 .procname = "keys", 950 .mode = 0555, 951 .child = key_sysctls, 952 }, 953 #endif 954 #ifdef CONFIG_RCU_TORTURE_TEST 955 { 956 .procname = "rcutorture_runnable", 957 .data = &rcutorture_runnable, 958 .maxlen = sizeof(int), 959 .mode = 0644, 960 .proc_handler = proc_dointvec, 961 }, 962 #endif 963 #ifdef CONFIG_PERF_EVENTS 964 /* 965 * User-space scripts rely on the existence of this file 966 * as a feature check for perf_events being enabled. 967 * 968 * So it's an ABI, do not remove! 969 */ 970 { 971 .procname = "perf_event_paranoid", 972 .data = &sysctl_perf_event_paranoid, 973 .maxlen = sizeof(sysctl_perf_event_paranoid), 974 .mode = 0644, 975 .proc_handler = proc_dointvec, 976 }, 977 { 978 .procname = "perf_event_mlock_kb", 979 .data = &sysctl_perf_event_mlock, 980 .maxlen = sizeof(sysctl_perf_event_mlock), 981 .mode = 0644, 982 .proc_handler = proc_dointvec, 983 }, 984 { 985 .procname = "perf_event_max_sample_rate", 986 .data = &sysctl_perf_event_sample_rate, 987 .maxlen = sizeof(sysctl_perf_event_sample_rate), 988 .mode = 0644, 989 .proc_handler = perf_proc_update_handler, 990 }, 991 #endif 992 #ifdef CONFIG_KMEMCHECK 993 { 994 .procname = "kmemcheck", 995 .data = &kmemcheck_enabled, 996 .maxlen = sizeof(int), 997 .mode = 0644, 998 .proc_handler = proc_dointvec, 999 }, 1000 #endif 1001 #ifdef CONFIG_BLOCK 1002 { 1003 .procname = "blk_iopoll", 1004 .data = &blk_iopoll_enabled, 1005 .maxlen = sizeof(int), 1006 .mode = 0644, 1007 .proc_handler = proc_dointvec, 1008 }, 1009 #endif 1010 { } 1011 }; 1012 1013 static struct ctl_table vm_table[] = { 1014 { 1015 .procname = "overcommit_memory", 1016 .data = &sysctl_overcommit_memory, 1017 .maxlen = sizeof(sysctl_overcommit_memory), 1018 .mode = 0644, 1019 .proc_handler = proc_dointvec_minmax, 1020 .extra1 = &zero, 1021 .extra2 = &two, 1022 }, 1023 { 1024 .procname = "panic_on_oom", 1025 .data = &sysctl_panic_on_oom, 1026 .maxlen = sizeof(sysctl_panic_on_oom), 1027 .mode = 0644, 1028 .proc_handler = proc_dointvec_minmax, 1029 .extra1 = &zero, 1030 .extra2 = &two, 1031 }, 1032 { 1033 .procname = "oom_kill_allocating_task", 1034 .data = &sysctl_oom_kill_allocating_task, 1035 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1036 .mode = 0644, 1037 .proc_handler = proc_dointvec, 1038 }, 1039 { 1040 .procname = "oom_dump_tasks", 1041 .data = &sysctl_oom_dump_tasks, 1042 .maxlen = sizeof(sysctl_oom_dump_tasks), 1043 .mode = 0644, 1044 .proc_handler = proc_dointvec, 1045 }, 1046 { 1047 .procname = "overcommit_ratio", 1048 .data = &sysctl_overcommit_ratio, 1049 .maxlen = sizeof(sysctl_overcommit_ratio), 1050 .mode = 0644, 1051 .proc_handler = proc_dointvec, 1052 }, 1053 { 1054 .procname = "page-cluster", 1055 .data = &page_cluster, 1056 .maxlen = sizeof(int), 1057 .mode = 0644, 1058 .proc_handler = proc_dointvec_minmax, 1059 .extra1 = &zero, 1060 }, 1061 { 1062 .procname = "dirty_background_ratio", 1063 .data = &dirty_background_ratio, 1064 .maxlen = sizeof(dirty_background_ratio), 1065 .mode = 0644, 1066 .proc_handler = dirty_background_ratio_handler, 1067 .extra1 = &zero, 1068 .extra2 = &one_hundred, 1069 }, 1070 { 1071 .procname = "dirty_background_bytes", 1072 .data = &dirty_background_bytes, 1073 .maxlen = sizeof(dirty_background_bytes), 1074 .mode = 0644, 1075 .proc_handler = dirty_background_bytes_handler, 1076 .extra1 = &one_ul, 1077 }, 1078 { 1079 .procname = "dirty_ratio", 1080 .data = &vm_dirty_ratio, 1081 .maxlen = sizeof(vm_dirty_ratio), 1082 .mode = 0644, 1083 .proc_handler = dirty_ratio_handler, 1084 .extra1 = &zero, 1085 .extra2 = &one_hundred, 1086 }, 1087 { 1088 .procname = "dirty_bytes", 1089 .data = &vm_dirty_bytes, 1090 .maxlen = sizeof(vm_dirty_bytes), 1091 .mode = 0644, 1092 .proc_handler = dirty_bytes_handler, 1093 .extra1 = &dirty_bytes_min, 1094 }, 1095 { 1096 .procname = "dirty_writeback_centisecs", 1097 .data = &dirty_writeback_interval, 1098 .maxlen = sizeof(dirty_writeback_interval), 1099 .mode = 0644, 1100 .proc_handler = dirty_writeback_centisecs_handler, 1101 }, 1102 { 1103 .procname = "dirty_expire_centisecs", 1104 .data = &dirty_expire_interval, 1105 .maxlen = sizeof(dirty_expire_interval), 1106 .mode = 0644, 1107 .proc_handler = proc_dointvec_minmax, 1108 .extra1 = &zero, 1109 }, 1110 { 1111 .procname = "nr_pdflush_threads", 1112 .data = &nr_pdflush_threads, 1113 .maxlen = sizeof nr_pdflush_threads, 1114 .mode = 0444 /* read-only*/, 1115 .proc_handler = proc_dointvec, 1116 }, 1117 { 1118 .procname = "swappiness", 1119 .data = &vm_swappiness, 1120 .maxlen = sizeof(vm_swappiness), 1121 .mode = 0644, 1122 .proc_handler = proc_dointvec_minmax, 1123 .extra1 = &zero, 1124 .extra2 = &one_hundred, 1125 }, 1126 #ifdef CONFIG_HUGETLB_PAGE 1127 { 1128 .procname = "nr_hugepages", 1129 .data = NULL, 1130 .maxlen = sizeof(unsigned long), 1131 .mode = 0644, 1132 .proc_handler = hugetlb_sysctl_handler, 1133 .extra1 = (void *)&hugetlb_zero, 1134 .extra2 = (void *)&hugetlb_infinity, 1135 }, 1136 #ifdef CONFIG_NUMA 1137 { 1138 .procname = "nr_hugepages_mempolicy", 1139 .data = NULL, 1140 .maxlen = sizeof(unsigned long), 1141 .mode = 0644, 1142 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1143 .extra1 = (void *)&hugetlb_zero, 1144 .extra2 = (void *)&hugetlb_infinity, 1145 }, 1146 #endif 1147 { 1148 .procname = "hugetlb_shm_group", 1149 .data = &sysctl_hugetlb_shm_group, 1150 .maxlen = sizeof(gid_t), 1151 .mode = 0644, 1152 .proc_handler = proc_dointvec, 1153 }, 1154 { 1155 .procname = "hugepages_treat_as_movable", 1156 .data = &hugepages_treat_as_movable, 1157 .maxlen = sizeof(int), 1158 .mode = 0644, 1159 .proc_handler = hugetlb_treat_movable_handler, 1160 }, 1161 { 1162 .procname = "nr_overcommit_hugepages", 1163 .data = NULL, 1164 .maxlen = sizeof(unsigned long), 1165 .mode = 0644, 1166 .proc_handler = hugetlb_overcommit_handler, 1167 .extra1 = (void *)&hugetlb_zero, 1168 .extra2 = (void *)&hugetlb_infinity, 1169 }, 1170 #endif 1171 { 1172 .procname = "lowmem_reserve_ratio", 1173 .data = &sysctl_lowmem_reserve_ratio, 1174 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1175 .mode = 0644, 1176 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1177 }, 1178 { 1179 .procname = "drop_caches", 1180 .data = &sysctl_drop_caches, 1181 .maxlen = sizeof(int), 1182 .mode = 0644, 1183 .proc_handler = drop_caches_sysctl_handler, 1184 .extra1 = &one, 1185 .extra2 = &three, 1186 }, 1187 #ifdef CONFIG_COMPACTION 1188 { 1189 .procname = "compact_memory", 1190 .data = &sysctl_compact_memory, 1191 .maxlen = sizeof(int), 1192 .mode = 0200, 1193 .proc_handler = sysctl_compaction_handler, 1194 }, 1195 { 1196 .procname = "extfrag_threshold", 1197 .data = &sysctl_extfrag_threshold, 1198 .maxlen = sizeof(int), 1199 .mode = 0644, 1200 .proc_handler = sysctl_extfrag_handler, 1201 .extra1 = &min_extfrag_threshold, 1202 .extra2 = &max_extfrag_threshold, 1203 }, 1204 1205 #endif /* CONFIG_COMPACTION */ 1206 { 1207 .procname = "min_free_kbytes", 1208 .data = &min_free_kbytes, 1209 .maxlen = sizeof(min_free_kbytes), 1210 .mode = 0644, 1211 .proc_handler = min_free_kbytes_sysctl_handler, 1212 .extra1 = &zero, 1213 }, 1214 { 1215 .procname = "percpu_pagelist_fraction", 1216 .data = &percpu_pagelist_fraction, 1217 .maxlen = sizeof(percpu_pagelist_fraction), 1218 .mode = 0644, 1219 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1220 .extra1 = &min_percpu_pagelist_fract, 1221 }, 1222 #ifdef CONFIG_MMU 1223 { 1224 .procname = "max_map_count", 1225 .data = &sysctl_max_map_count, 1226 .maxlen = sizeof(sysctl_max_map_count), 1227 .mode = 0644, 1228 .proc_handler = proc_dointvec_minmax, 1229 .extra1 = &zero, 1230 }, 1231 #else 1232 { 1233 .procname = "nr_trim_pages", 1234 .data = &sysctl_nr_trim_pages, 1235 .maxlen = sizeof(sysctl_nr_trim_pages), 1236 .mode = 0644, 1237 .proc_handler = proc_dointvec_minmax, 1238 .extra1 = &zero, 1239 }, 1240 #endif 1241 { 1242 .procname = "laptop_mode", 1243 .data = &laptop_mode, 1244 .maxlen = sizeof(laptop_mode), 1245 .mode = 0644, 1246 .proc_handler = proc_dointvec_jiffies, 1247 }, 1248 { 1249 .procname = "block_dump", 1250 .data = &block_dump, 1251 .maxlen = sizeof(block_dump), 1252 .mode = 0644, 1253 .proc_handler = proc_dointvec, 1254 .extra1 = &zero, 1255 }, 1256 { 1257 .procname = "vfs_cache_pressure", 1258 .data = &sysctl_vfs_cache_pressure, 1259 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1260 .mode = 0644, 1261 .proc_handler = proc_dointvec, 1262 .extra1 = &zero, 1263 }, 1264 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1265 { 1266 .procname = "legacy_va_layout", 1267 .data = &sysctl_legacy_va_layout, 1268 .maxlen = sizeof(sysctl_legacy_va_layout), 1269 .mode = 0644, 1270 .proc_handler = proc_dointvec, 1271 .extra1 = &zero, 1272 }, 1273 #endif 1274 #ifdef CONFIG_NUMA 1275 { 1276 .procname = "zone_reclaim_mode", 1277 .data = &zone_reclaim_mode, 1278 .maxlen = sizeof(zone_reclaim_mode), 1279 .mode = 0644, 1280 .proc_handler = proc_dointvec, 1281 .extra1 = &zero, 1282 }, 1283 { 1284 .procname = "min_unmapped_ratio", 1285 .data = &sysctl_min_unmapped_ratio, 1286 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1287 .mode = 0644, 1288 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1289 .extra1 = &zero, 1290 .extra2 = &one_hundred, 1291 }, 1292 { 1293 .procname = "min_slab_ratio", 1294 .data = &sysctl_min_slab_ratio, 1295 .maxlen = sizeof(sysctl_min_slab_ratio), 1296 .mode = 0644, 1297 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1298 .extra1 = &zero, 1299 .extra2 = &one_hundred, 1300 }, 1301 #endif 1302 #ifdef CONFIG_SMP 1303 { 1304 .procname = "stat_interval", 1305 .data = &sysctl_stat_interval, 1306 .maxlen = sizeof(sysctl_stat_interval), 1307 .mode = 0644, 1308 .proc_handler = proc_dointvec_jiffies, 1309 }, 1310 #endif 1311 #ifdef CONFIG_MMU 1312 { 1313 .procname = "mmap_min_addr", 1314 .data = &dac_mmap_min_addr, 1315 .maxlen = sizeof(unsigned long), 1316 .mode = 0644, 1317 .proc_handler = mmap_min_addr_handler, 1318 }, 1319 #endif 1320 #ifdef CONFIG_NUMA 1321 { 1322 .procname = "numa_zonelist_order", 1323 .data = &numa_zonelist_order, 1324 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1325 .mode = 0644, 1326 .proc_handler = numa_zonelist_order_handler, 1327 }, 1328 #endif 1329 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1330 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1331 { 1332 .procname = "vdso_enabled", 1333 .data = &vdso_enabled, 1334 .maxlen = sizeof(vdso_enabled), 1335 .mode = 0644, 1336 .proc_handler = proc_dointvec, 1337 .extra1 = &zero, 1338 }, 1339 #endif 1340 #ifdef CONFIG_HIGHMEM 1341 { 1342 .procname = "highmem_is_dirtyable", 1343 .data = &vm_highmem_is_dirtyable, 1344 .maxlen = sizeof(vm_highmem_is_dirtyable), 1345 .mode = 0644, 1346 .proc_handler = proc_dointvec_minmax, 1347 .extra1 = &zero, 1348 .extra2 = &one, 1349 }, 1350 #endif 1351 { 1352 .procname = "scan_unevictable_pages", 1353 .data = &scan_unevictable_pages, 1354 .maxlen = sizeof(scan_unevictable_pages), 1355 .mode = 0644, 1356 .proc_handler = scan_unevictable_handler, 1357 }, 1358 #ifdef CONFIG_MEMORY_FAILURE 1359 { 1360 .procname = "memory_failure_early_kill", 1361 .data = &sysctl_memory_failure_early_kill, 1362 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1363 .mode = 0644, 1364 .proc_handler = proc_dointvec_minmax, 1365 .extra1 = &zero, 1366 .extra2 = &one, 1367 }, 1368 { 1369 .procname = "memory_failure_recovery", 1370 .data = &sysctl_memory_failure_recovery, 1371 .maxlen = sizeof(sysctl_memory_failure_recovery), 1372 .mode = 0644, 1373 .proc_handler = proc_dointvec_minmax, 1374 .extra1 = &zero, 1375 .extra2 = &one, 1376 }, 1377 #endif 1378 { } 1379 }; 1380 1381 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1382 static struct ctl_table binfmt_misc_table[] = { 1383 { } 1384 }; 1385 #endif 1386 1387 static struct ctl_table fs_table[] = { 1388 { 1389 .procname = "inode-nr", 1390 .data = &inodes_stat, 1391 .maxlen = 2*sizeof(int), 1392 .mode = 0444, 1393 .proc_handler = proc_nr_inodes, 1394 }, 1395 { 1396 .procname = "inode-state", 1397 .data = &inodes_stat, 1398 .maxlen = 7*sizeof(int), 1399 .mode = 0444, 1400 .proc_handler = proc_nr_inodes, 1401 }, 1402 { 1403 .procname = "file-nr", 1404 .data = &files_stat, 1405 .maxlen = sizeof(files_stat), 1406 .mode = 0444, 1407 .proc_handler = proc_nr_files, 1408 }, 1409 { 1410 .procname = "file-max", 1411 .data = &files_stat.max_files, 1412 .maxlen = sizeof(files_stat.max_files), 1413 .mode = 0644, 1414 .proc_handler = proc_doulongvec_minmax, 1415 }, 1416 { 1417 .procname = "nr_open", 1418 .data = &sysctl_nr_open, 1419 .maxlen = sizeof(int), 1420 .mode = 0644, 1421 .proc_handler = proc_dointvec_minmax, 1422 .extra1 = &sysctl_nr_open_min, 1423 .extra2 = &sysctl_nr_open_max, 1424 }, 1425 { 1426 .procname = "dentry-state", 1427 .data = &dentry_stat, 1428 .maxlen = 6*sizeof(int), 1429 .mode = 0444, 1430 .proc_handler = proc_nr_dentry, 1431 }, 1432 { 1433 .procname = "overflowuid", 1434 .data = &fs_overflowuid, 1435 .maxlen = sizeof(int), 1436 .mode = 0644, 1437 .proc_handler = proc_dointvec_minmax, 1438 .extra1 = &minolduid, 1439 .extra2 = &maxolduid, 1440 }, 1441 { 1442 .procname = "overflowgid", 1443 .data = &fs_overflowgid, 1444 .maxlen = sizeof(int), 1445 .mode = 0644, 1446 .proc_handler = proc_dointvec_minmax, 1447 .extra1 = &minolduid, 1448 .extra2 = &maxolduid, 1449 }, 1450 #ifdef CONFIG_FILE_LOCKING 1451 { 1452 .procname = "leases-enable", 1453 .data = &leases_enable, 1454 .maxlen = sizeof(int), 1455 .mode = 0644, 1456 .proc_handler = proc_dointvec, 1457 }, 1458 #endif 1459 #ifdef CONFIG_DNOTIFY 1460 { 1461 .procname = "dir-notify-enable", 1462 .data = &dir_notify_enable, 1463 .maxlen = sizeof(int), 1464 .mode = 0644, 1465 .proc_handler = proc_dointvec, 1466 }, 1467 #endif 1468 #ifdef CONFIG_MMU 1469 #ifdef CONFIG_FILE_LOCKING 1470 { 1471 .procname = "lease-break-time", 1472 .data = &lease_break_time, 1473 .maxlen = sizeof(int), 1474 .mode = 0644, 1475 .proc_handler = proc_dointvec, 1476 }, 1477 #endif 1478 #ifdef CONFIG_AIO 1479 { 1480 .procname = "aio-nr", 1481 .data = &aio_nr, 1482 .maxlen = sizeof(aio_nr), 1483 .mode = 0444, 1484 .proc_handler = proc_doulongvec_minmax, 1485 }, 1486 { 1487 .procname = "aio-max-nr", 1488 .data = &aio_max_nr, 1489 .maxlen = sizeof(aio_max_nr), 1490 .mode = 0644, 1491 .proc_handler = proc_doulongvec_minmax, 1492 }, 1493 #endif /* CONFIG_AIO */ 1494 #ifdef CONFIG_INOTIFY_USER 1495 { 1496 .procname = "inotify", 1497 .mode = 0555, 1498 .child = inotify_table, 1499 }, 1500 #endif 1501 #ifdef CONFIG_EPOLL 1502 { 1503 .procname = "epoll", 1504 .mode = 0555, 1505 .child = epoll_table, 1506 }, 1507 #endif 1508 #endif 1509 { 1510 .procname = "suid_dumpable", 1511 .data = &suid_dumpable, 1512 .maxlen = sizeof(int), 1513 .mode = 0644, 1514 .proc_handler = proc_dointvec_minmax, 1515 .extra1 = &zero, 1516 .extra2 = &two, 1517 }, 1518 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1519 { 1520 .procname = "binfmt_misc", 1521 .mode = 0555, 1522 .child = binfmt_misc_table, 1523 }, 1524 #endif 1525 { 1526 .procname = "pipe-max-size", 1527 .data = &pipe_max_size, 1528 .maxlen = sizeof(int), 1529 .mode = 0644, 1530 .proc_handler = &pipe_proc_fn, 1531 .extra1 = &pipe_min_size, 1532 }, 1533 { } 1534 }; 1535 1536 static struct ctl_table debug_table[] = { 1537 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \ 1538 defined(CONFIG_S390) || defined(CONFIG_TILE) 1539 { 1540 .procname = "exception-trace", 1541 .data = &show_unhandled_signals, 1542 .maxlen = sizeof(int), 1543 .mode = 0644, 1544 .proc_handler = proc_dointvec 1545 }, 1546 #endif 1547 #if defined(CONFIG_OPTPROBES) 1548 { 1549 .procname = "kprobes-optimization", 1550 .data = &sysctl_kprobes_optimization, 1551 .maxlen = sizeof(int), 1552 .mode = 0644, 1553 .proc_handler = proc_kprobes_optimization_handler, 1554 .extra1 = &zero, 1555 .extra2 = &one, 1556 }, 1557 #endif 1558 { } 1559 }; 1560 1561 static struct ctl_table dev_table[] = { 1562 { } 1563 }; 1564 1565 static DEFINE_SPINLOCK(sysctl_lock); 1566 1567 /* called under sysctl_lock */ 1568 static int use_table(struct ctl_table_header *p) 1569 { 1570 if (unlikely(p->unregistering)) 1571 return 0; 1572 p->used++; 1573 return 1; 1574 } 1575 1576 /* called under sysctl_lock */ 1577 static void unuse_table(struct ctl_table_header *p) 1578 { 1579 if (!--p->used) 1580 if (unlikely(p->unregistering)) 1581 complete(p->unregistering); 1582 } 1583 1584 /* called under sysctl_lock, will reacquire if has to wait */ 1585 static void start_unregistering(struct ctl_table_header *p) 1586 { 1587 /* 1588 * if p->used is 0, nobody will ever touch that entry again; 1589 * we'll eliminate all paths to it before dropping sysctl_lock 1590 */ 1591 if (unlikely(p->used)) { 1592 struct completion wait; 1593 init_completion(&wait); 1594 p->unregistering = &wait; 1595 spin_unlock(&sysctl_lock); 1596 wait_for_completion(&wait); 1597 spin_lock(&sysctl_lock); 1598 } else { 1599 /* anything non-NULL; we'll never dereference it */ 1600 p->unregistering = ERR_PTR(-EINVAL); 1601 } 1602 /* 1603 * do not remove from the list until nobody holds it; walking the 1604 * list in do_sysctl() relies on that. 1605 */ 1606 list_del_init(&p->ctl_entry); 1607 } 1608 1609 void sysctl_head_get(struct ctl_table_header *head) 1610 { 1611 spin_lock(&sysctl_lock); 1612 head->count++; 1613 spin_unlock(&sysctl_lock); 1614 } 1615 1616 void sysctl_head_put(struct ctl_table_header *head) 1617 { 1618 spin_lock(&sysctl_lock); 1619 if (!--head->count) 1620 kfree_rcu(head, rcu); 1621 spin_unlock(&sysctl_lock); 1622 } 1623 1624 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1625 { 1626 if (!head) 1627 BUG(); 1628 spin_lock(&sysctl_lock); 1629 if (!use_table(head)) 1630 head = ERR_PTR(-ENOENT); 1631 spin_unlock(&sysctl_lock); 1632 return head; 1633 } 1634 1635 void sysctl_head_finish(struct ctl_table_header *head) 1636 { 1637 if (!head) 1638 return; 1639 spin_lock(&sysctl_lock); 1640 unuse_table(head); 1641 spin_unlock(&sysctl_lock); 1642 } 1643 1644 static struct ctl_table_set * 1645 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1646 { 1647 struct ctl_table_set *set = &root->default_set; 1648 if (root->lookup) 1649 set = root->lookup(root, namespaces); 1650 return set; 1651 } 1652 1653 static struct list_head * 1654 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1655 { 1656 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1657 return &set->list; 1658 } 1659 1660 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1661 struct ctl_table_header *prev) 1662 { 1663 struct ctl_table_root *root; 1664 struct list_head *header_list; 1665 struct ctl_table_header *head; 1666 struct list_head *tmp; 1667 1668 spin_lock(&sysctl_lock); 1669 if (prev) { 1670 head = prev; 1671 tmp = &prev->ctl_entry; 1672 unuse_table(prev); 1673 goto next; 1674 } 1675 tmp = &root_table_header.ctl_entry; 1676 for (;;) { 1677 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1678 1679 if (!use_table(head)) 1680 goto next; 1681 spin_unlock(&sysctl_lock); 1682 return head; 1683 next: 1684 root = head->root; 1685 tmp = tmp->next; 1686 header_list = lookup_header_list(root, namespaces); 1687 if (tmp != header_list) 1688 continue; 1689 1690 do { 1691 root = list_entry(root->root_list.next, 1692 struct ctl_table_root, root_list); 1693 if (root == &sysctl_table_root) 1694 goto out; 1695 header_list = lookup_header_list(root, namespaces); 1696 } while (list_empty(header_list)); 1697 tmp = header_list->next; 1698 } 1699 out: 1700 spin_unlock(&sysctl_lock); 1701 return NULL; 1702 } 1703 1704 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1705 { 1706 return __sysctl_head_next(current->nsproxy, prev); 1707 } 1708 1709 void register_sysctl_root(struct ctl_table_root *root) 1710 { 1711 spin_lock(&sysctl_lock); 1712 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1713 spin_unlock(&sysctl_lock); 1714 } 1715 1716 /* 1717 * sysctl_perm does NOT grant the superuser all rights automatically, because 1718 * some sysctl variables are readonly even to root. 1719 */ 1720 1721 static int test_perm(int mode, int op) 1722 { 1723 if (!current_euid()) 1724 mode >>= 6; 1725 else if (in_egroup_p(0)) 1726 mode >>= 3; 1727 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1728 return 0; 1729 return -EACCES; 1730 } 1731 1732 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1733 { 1734 int mode; 1735 1736 if (root->permissions) 1737 mode = root->permissions(root, current->nsproxy, table); 1738 else 1739 mode = table->mode; 1740 1741 return test_perm(mode, op); 1742 } 1743 1744 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1745 { 1746 for (; table->procname; table++) { 1747 table->parent = parent; 1748 if (table->child) 1749 sysctl_set_parent(table, table->child); 1750 } 1751 } 1752 1753 static __init int sysctl_init(void) 1754 { 1755 sysctl_set_parent(NULL, root_table); 1756 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1757 sysctl_check_table(current->nsproxy, root_table); 1758 #endif 1759 return 0; 1760 } 1761 1762 core_initcall(sysctl_init); 1763 1764 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1765 struct ctl_table *table) 1766 { 1767 struct ctl_table *p; 1768 const char *s = branch->procname; 1769 1770 /* branch should have named subdirectory as its first element */ 1771 if (!s || !branch->child) 1772 return NULL; 1773 1774 /* ... and nothing else */ 1775 if (branch[1].procname) 1776 return NULL; 1777 1778 /* table should contain subdirectory with the same name */ 1779 for (p = table; p->procname; p++) { 1780 if (!p->child) 1781 continue; 1782 if (p->procname && strcmp(p->procname, s) == 0) 1783 return p; 1784 } 1785 return NULL; 1786 } 1787 1788 /* see if attaching q to p would be an improvement */ 1789 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1790 { 1791 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1792 struct ctl_table *next; 1793 int is_better = 0; 1794 int not_in_parent = !p->attached_by; 1795 1796 while ((next = is_branch_in(by, to)) != NULL) { 1797 if (by == q->attached_by) 1798 is_better = 1; 1799 if (to == p->attached_by) 1800 not_in_parent = 1; 1801 by = by->child; 1802 to = next->child; 1803 } 1804 1805 if (is_better && not_in_parent) { 1806 q->attached_by = by; 1807 q->attached_to = to; 1808 q->parent = p; 1809 } 1810 } 1811 1812 /** 1813 * __register_sysctl_paths - register a sysctl hierarchy 1814 * @root: List of sysctl headers to register on 1815 * @namespaces: Data to compute which lists of sysctl entries are visible 1816 * @path: The path to the directory the sysctl table is in. 1817 * @table: the top-level table structure 1818 * 1819 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1820 * array. A completely 0 filled entry terminates the table. 1821 * 1822 * The members of the &struct ctl_table structure are used as follows: 1823 * 1824 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1825 * enter a sysctl file 1826 * 1827 * data - a pointer to data for use by proc_handler 1828 * 1829 * maxlen - the maximum size in bytes of the data 1830 * 1831 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1832 * 1833 * child - a pointer to the child sysctl table if this entry is a directory, or 1834 * %NULL. 1835 * 1836 * proc_handler - the text handler routine (described below) 1837 * 1838 * de - for internal use by the sysctl routines 1839 * 1840 * extra1, extra2 - extra pointers usable by the proc handler routines 1841 * 1842 * Leaf nodes in the sysctl tree will be represented by a single file 1843 * under /proc; non-leaf nodes will be represented by directories. 1844 * 1845 * sysctl(2) can automatically manage read and write requests through 1846 * the sysctl table. The data and maxlen fields of the ctl_table 1847 * struct enable minimal validation of the values being written to be 1848 * performed, and the mode field allows minimal authentication. 1849 * 1850 * There must be a proc_handler routine for any terminal nodes 1851 * mirrored under /proc/sys (non-terminals are handled by a built-in 1852 * directory handler). Several default handlers are available to 1853 * cover common cases - 1854 * 1855 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1856 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1857 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1858 * 1859 * It is the handler's job to read the input buffer from user memory 1860 * and process it. The handler should return 0 on success. 1861 * 1862 * This routine returns %NULL on a failure to register, and a pointer 1863 * to the table header on success. 1864 */ 1865 struct ctl_table_header *__register_sysctl_paths( 1866 struct ctl_table_root *root, 1867 struct nsproxy *namespaces, 1868 const struct ctl_path *path, struct ctl_table *table) 1869 { 1870 struct ctl_table_header *header; 1871 struct ctl_table *new, **prevp; 1872 unsigned int n, npath; 1873 struct ctl_table_set *set; 1874 1875 /* Count the path components */ 1876 for (npath = 0; path[npath].procname; ++npath) 1877 ; 1878 1879 /* 1880 * For each path component, allocate a 2-element ctl_table array. 1881 * The first array element will be filled with the sysctl entry 1882 * for this, the second will be the sentinel (procname == 0). 1883 * 1884 * We allocate everything in one go so that we don't have to 1885 * worry about freeing additional memory in unregister_sysctl_table. 1886 */ 1887 header = kzalloc(sizeof(struct ctl_table_header) + 1888 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1889 if (!header) 1890 return NULL; 1891 1892 new = (struct ctl_table *) (header + 1); 1893 1894 /* Now connect the dots */ 1895 prevp = &header->ctl_table; 1896 for (n = 0; n < npath; ++n, ++path) { 1897 /* Copy the procname */ 1898 new->procname = path->procname; 1899 new->mode = 0555; 1900 1901 *prevp = new; 1902 prevp = &new->child; 1903 1904 new += 2; 1905 } 1906 *prevp = table; 1907 header->ctl_table_arg = table; 1908 1909 INIT_LIST_HEAD(&header->ctl_entry); 1910 header->used = 0; 1911 header->unregistering = NULL; 1912 header->root = root; 1913 sysctl_set_parent(NULL, header->ctl_table); 1914 header->count = 1; 1915 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1916 if (sysctl_check_table(namespaces, header->ctl_table)) { 1917 kfree(header); 1918 return NULL; 1919 } 1920 #endif 1921 spin_lock(&sysctl_lock); 1922 header->set = lookup_header_set(root, namespaces); 1923 header->attached_by = header->ctl_table; 1924 header->attached_to = root_table; 1925 header->parent = &root_table_header; 1926 for (set = header->set; set; set = set->parent) { 1927 struct ctl_table_header *p; 1928 list_for_each_entry(p, &set->list, ctl_entry) { 1929 if (p->unregistering) 1930 continue; 1931 try_attach(p, header); 1932 } 1933 } 1934 header->parent->count++; 1935 list_add_tail(&header->ctl_entry, &header->set->list); 1936 spin_unlock(&sysctl_lock); 1937 1938 return header; 1939 } 1940 1941 /** 1942 * register_sysctl_table_path - register a sysctl table hierarchy 1943 * @path: The path to the directory the sysctl table is in. 1944 * @table: the top-level table structure 1945 * 1946 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1947 * array. A completely 0 filled entry terminates the table. 1948 * 1949 * See __register_sysctl_paths for more details. 1950 */ 1951 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1952 struct ctl_table *table) 1953 { 1954 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1955 path, table); 1956 } 1957 1958 /** 1959 * register_sysctl_table - register a sysctl table hierarchy 1960 * @table: the top-level table structure 1961 * 1962 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1963 * array. A completely 0 filled entry terminates the table. 1964 * 1965 * See register_sysctl_paths for more details. 1966 */ 1967 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1968 { 1969 static const struct ctl_path null_path[] = { {} }; 1970 1971 return register_sysctl_paths(null_path, table); 1972 } 1973 1974 /** 1975 * unregister_sysctl_table - unregister a sysctl table hierarchy 1976 * @header: the header returned from register_sysctl_table 1977 * 1978 * Unregisters the sysctl table and all children. proc entries may not 1979 * actually be removed until they are no longer used by anyone. 1980 */ 1981 void unregister_sysctl_table(struct ctl_table_header * header) 1982 { 1983 might_sleep(); 1984 1985 if (header == NULL) 1986 return; 1987 1988 spin_lock(&sysctl_lock); 1989 start_unregistering(header); 1990 if (!--header->parent->count) { 1991 WARN_ON(1); 1992 kfree_rcu(header->parent, rcu); 1993 } 1994 if (!--header->count) 1995 kfree_rcu(header, rcu); 1996 spin_unlock(&sysctl_lock); 1997 } 1998 1999 int sysctl_is_seen(struct ctl_table_header *p) 2000 { 2001 struct ctl_table_set *set = p->set; 2002 int res; 2003 spin_lock(&sysctl_lock); 2004 if (p->unregistering) 2005 res = 0; 2006 else if (!set->is_seen) 2007 res = 1; 2008 else 2009 res = set->is_seen(set); 2010 spin_unlock(&sysctl_lock); 2011 return res; 2012 } 2013 2014 void setup_sysctl_set(struct ctl_table_set *p, 2015 struct ctl_table_set *parent, 2016 int (*is_seen)(struct ctl_table_set *)) 2017 { 2018 INIT_LIST_HEAD(&p->list); 2019 p->parent = parent ? parent : &sysctl_table_root.default_set; 2020 p->is_seen = is_seen; 2021 } 2022 2023 #else /* !CONFIG_SYSCTL */ 2024 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2025 { 2026 return NULL; 2027 } 2028 2029 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2030 struct ctl_table *table) 2031 { 2032 return NULL; 2033 } 2034 2035 void unregister_sysctl_table(struct ctl_table_header * table) 2036 { 2037 } 2038 2039 void setup_sysctl_set(struct ctl_table_set *p, 2040 struct ctl_table_set *parent, 2041 int (*is_seen)(struct ctl_table_set *)) 2042 { 2043 } 2044 2045 void sysctl_head_put(struct ctl_table_header *head) 2046 { 2047 } 2048 2049 #endif /* CONFIG_SYSCTL */ 2050 2051 /* 2052 * /proc/sys support 2053 */ 2054 2055 #ifdef CONFIG_PROC_SYSCTL 2056 2057 static int _proc_do_string(void* data, int maxlen, int write, 2058 void __user *buffer, 2059 size_t *lenp, loff_t *ppos) 2060 { 2061 size_t len; 2062 char __user *p; 2063 char c; 2064 2065 if (!data || !maxlen || !*lenp) { 2066 *lenp = 0; 2067 return 0; 2068 } 2069 2070 if (write) { 2071 len = 0; 2072 p = buffer; 2073 while (len < *lenp) { 2074 if (get_user(c, p++)) 2075 return -EFAULT; 2076 if (c == 0 || c == '\n') 2077 break; 2078 len++; 2079 } 2080 if (len >= maxlen) 2081 len = maxlen-1; 2082 if(copy_from_user(data, buffer, len)) 2083 return -EFAULT; 2084 ((char *) data)[len] = 0; 2085 *ppos += *lenp; 2086 } else { 2087 len = strlen(data); 2088 if (len > maxlen) 2089 len = maxlen; 2090 2091 if (*ppos > len) { 2092 *lenp = 0; 2093 return 0; 2094 } 2095 2096 data += *ppos; 2097 len -= *ppos; 2098 2099 if (len > *lenp) 2100 len = *lenp; 2101 if (len) 2102 if(copy_to_user(buffer, data, len)) 2103 return -EFAULT; 2104 if (len < *lenp) { 2105 if(put_user('\n', ((char __user *) buffer) + len)) 2106 return -EFAULT; 2107 len++; 2108 } 2109 *lenp = len; 2110 *ppos += len; 2111 } 2112 return 0; 2113 } 2114 2115 /** 2116 * proc_dostring - read a string sysctl 2117 * @table: the sysctl table 2118 * @write: %TRUE if this is a write to the sysctl file 2119 * @buffer: the user buffer 2120 * @lenp: the size of the user buffer 2121 * @ppos: file position 2122 * 2123 * Reads/writes a string from/to the user buffer. If the kernel 2124 * buffer provided is not large enough to hold the string, the 2125 * string is truncated. The copied string is %NULL-terminated. 2126 * If the string is being read by the user process, it is copied 2127 * and a newline '\n' is added. It is truncated if the buffer is 2128 * not large enough. 2129 * 2130 * Returns 0 on success. 2131 */ 2132 int proc_dostring(struct ctl_table *table, int write, 2133 void __user *buffer, size_t *lenp, loff_t *ppos) 2134 { 2135 return _proc_do_string(table->data, table->maxlen, write, 2136 buffer, lenp, ppos); 2137 } 2138 2139 static size_t proc_skip_spaces(char **buf) 2140 { 2141 size_t ret; 2142 char *tmp = skip_spaces(*buf); 2143 ret = tmp - *buf; 2144 *buf = tmp; 2145 return ret; 2146 } 2147 2148 static void proc_skip_char(char **buf, size_t *size, const char v) 2149 { 2150 while (*size) { 2151 if (**buf != v) 2152 break; 2153 (*size)--; 2154 (*buf)++; 2155 } 2156 } 2157 2158 #define TMPBUFLEN 22 2159 /** 2160 * proc_get_long - reads an ASCII formatted integer from a user buffer 2161 * 2162 * @buf: a kernel buffer 2163 * @size: size of the kernel buffer 2164 * @val: this is where the number will be stored 2165 * @neg: set to %TRUE if number is negative 2166 * @perm_tr: a vector which contains the allowed trailers 2167 * @perm_tr_len: size of the perm_tr vector 2168 * @tr: pointer to store the trailer character 2169 * 2170 * In case of success %0 is returned and @buf and @size are updated with 2171 * the amount of bytes read. If @tr is non-NULL and a trailing 2172 * character exists (size is non-zero after returning from this 2173 * function), @tr is updated with the trailing character. 2174 */ 2175 static int proc_get_long(char **buf, size_t *size, 2176 unsigned long *val, bool *neg, 2177 const char *perm_tr, unsigned perm_tr_len, char *tr) 2178 { 2179 int len; 2180 char *p, tmp[TMPBUFLEN]; 2181 2182 if (!*size) 2183 return -EINVAL; 2184 2185 len = *size; 2186 if (len > TMPBUFLEN - 1) 2187 len = TMPBUFLEN - 1; 2188 2189 memcpy(tmp, *buf, len); 2190 2191 tmp[len] = 0; 2192 p = tmp; 2193 if (*p == '-' && *size > 1) { 2194 *neg = true; 2195 p++; 2196 } else 2197 *neg = false; 2198 if (!isdigit(*p)) 2199 return -EINVAL; 2200 2201 *val = simple_strtoul(p, &p, 0); 2202 2203 len = p - tmp; 2204 2205 /* We don't know if the next char is whitespace thus we may accept 2206 * invalid integers (e.g. 1234...a) or two integers instead of one 2207 * (e.g. 123...1). So lets not allow such large numbers. */ 2208 if (len == TMPBUFLEN - 1) 2209 return -EINVAL; 2210 2211 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2212 return -EINVAL; 2213 2214 if (tr && (len < *size)) 2215 *tr = *p; 2216 2217 *buf += len; 2218 *size -= len; 2219 2220 return 0; 2221 } 2222 2223 /** 2224 * proc_put_long - converts an integer to a decimal ASCII formatted string 2225 * 2226 * @buf: the user buffer 2227 * @size: the size of the user buffer 2228 * @val: the integer to be converted 2229 * @neg: sign of the number, %TRUE for negative 2230 * 2231 * In case of success %0 is returned and @buf and @size are updated with 2232 * the amount of bytes written. 2233 */ 2234 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2235 bool neg) 2236 { 2237 int len; 2238 char tmp[TMPBUFLEN], *p = tmp; 2239 2240 sprintf(p, "%s%lu", neg ? "-" : "", val); 2241 len = strlen(tmp); 2242 if (len > *size) 2243 len = *size; 2244 if (copy_to_user(*buf, tmp, len)) 2245 return -EFAULT; 2246 *size -= len; 2247 *buf += len; 2248 return 0; 2249 } 2250 #undef TMPBUFLEN 2251 2252 static int proc_put_char(void __user **buf, size_t *size, char c) 2253 { 2254 if (*size) { 2255 char __user **buffer = (char __user **)buf; 2256 if (put_user(c, *buffer)) 2257 return -EFAULT; 2258 (*size)--, (*buffer)++; 2259 *buf = *buffer; 2260 } 2261 return 0; 2262 } 2263 2264 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2265 int *valp, 2266 int write, void *data) 2267 { 2268 if (write) { 2269 *valp = *negp ? -*lvalp : *lvalp; 2270 } else { 2271 int val = *valp; 2272 if (val < 0) { 2273 *negp = true; 2274 *lvalp = (unsigned long)-val; 2275 } else { 2276 *negp = false; 2277 *lvalp = (unsigned long)val; 2278 } 2279 } 2280 return 0; 2281 } 2282 2283 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2284 2285 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2286 int write, void __user *buffer, 2287 size_t *lenp, loff_t *ppos, 2288 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2289 int write, void *data), 2290 void *data) 2291 { 2292 int *i, vleft, first = 1, err = 0; 2293 unsigned long page = 0; 2294 size_t left; 2295 char *kbuf; 2296 2297 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2298 *lenp = 0; 2299 return 0; 2300 } 2301 2302 i = (int *) tbl_data; 2303 vleft = table->maxlen / sizeof(*i); 2304 left = *lenp; 2305 2306 if (!conv) 2307 conv = do_proc_dointvec_conv; 2308 2309 if (write) { 2310 if (left > PAGE_SIZE - 1) 2311 left = PAGE_SIZE - 1; 2312 page = __get_free_page(GFP_TEMPORARY); 2313 kbuf = (char *) page; 2314 if (!kbuf) 2315 return -ENOMEM; 2316 if (copy_from_user(kbuf, buffer, left)) { 2317 err = -EFAULT; 2318 goto free; 2319 } 2320 kbuf[left] = 0; 2321 } 2322 2323 for (; left && vleft--; i++, first=0) { 2324 unsigned long lval; 2325 bool neg; 2326 2327 if (write) { 2328 left -= proc_skip_spaces(&kbuf); 2329 2330 if (!left) 2331 break; 2332 err = proc_get_long(&kbuf, &left, &lval, &neg, 2333 proc_wspace_sep, 2334 sizeof(proc_wspace_sep), NULL); 2335 if (err) 2336 break; 2337 if (conv(&neg, &lval, i, 1, data)) { 2338 err = -EINVAL; 2339 break; 2340 } 2341 } else { 2342 if (conv(&neg, &lval, i, 0, data)) { 2343 err = -EINVAL; 2344 break; 2345 } 2346 if (!first) 2347 err = proc_put_char(&buffer, &left, '\t'); 2348 if (err) 2349 break; 2350 err = proc_put_long(&buffer, &left, lval, neg); 2351 if (err) 2352 break; 2353 } 2354 } 2355 2356 if (!write && !first && left && !err) 2357 err = proc_put_char(&buffer, &left, '\n'); 2358 if (write && !err && left) 2359 left -= proc_skip_spaces(&kbuf); 2360 free: 2361 if (write) { 2362 free_page(page); 2363 if (first) 2364 return err ? : -EINVAL; 2365 } 2366 *lenp -= left; 2367 *ppos += *lenp; 2368 return err; 2369 } 2370 2371 static int do_proc_dointvec(struct ctl_table *table, int write, 2372 void __user *buffer, size_t *lenp, loff_t *ppos, 2373 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2374 int write, void *data), 2375 void *data) 2376 { 2377 return __do_proc_dointvec(table->data, table, write, 2378 buffer, lenp, ppos, conv, data); 2379 } 2380 2381 /** 2382 * proc_dointvec - read a vector of integers 2383 * @table: the sysctl table 2384 * @write: %TRUE if this is a write to the sysctl file 2385 * @buffer: the user buffer 2386 * @lenp: the size of the user buffer 2387 * @ppos: file position 2388 * 2389 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2390 * values from/to the user buffer, treated as an ASCII string. 2391 * 2392 * Returns 0 on success. 2393 */ 2394 int proc_dointvec(struct ctl_table *table, int write, 2395 void __user *buffer, size_t *lenp, loff_t *ppos) 2396 { 2397 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2398 NULL,NULL); 2399 } 2400 2401 /* 2402 * Taint values can only be increased 2403 * This means we can safely use a temporary. 2404 */ 2405 static int proc_taint(struct ctl_table *table, int write, 2406 void __user *buffer, size_t *lenp, loff_t *ppos) 2407 { 2408 struct ctl_table t; 2409 unsigned long tmptaint = get_taint(); 2410 int err; 2411 2412 if (write && !capable(CAP_SYS_ADMIN)) 2413 return -EPERM; 2414 2415 t = *table; 2416 t.data = &tmptaint; 2417 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2418 if (err < 0) 2419 return err; 2420 2421 if (write) { 2422 /* 2423 * Poor man's atomic or. Not worth adding a primitive 2424 * to everyone's atomic.h for this 2425 */ 2426 int i; 2427 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2428 if ((tmptaint >> i) & 1) 2429 add_taint(i); 2430 } 2431 } 2432 2433 return err; 2434 } 2435 2436 #ifdef CONFIG_PRINTK 2437 static int proc_dmesg_restrict(struct ctl_table *table, int write, 2438 void __user *buffer, size_t *lenp, loff_t *ppos) 2439 { 2440 if (write && !capable(CAP_SYS_ADMIN)) 2441 return -EPERM; 2442 2443 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2444 } 2445 #endif 2446 2447 struct do_proc_dointvec_minmax_conv_param { 2448 int *min; 2449 int *max; 2450 }; 2451 2452 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2453 int *valp, 2454 int write, void *data) 2455 { 2456 struct do_proc_dointvec_minmax_conv_param *param = data; 2457 if (write) { 2458 int val = *negp ? -*lvalp : *lvalp; 2459 if ((param->min && *param->min > val) || 2460 (param->max && *param->max < val)) 2461 return -EINVAL; 2462 *valp = val; 2463 } else { 2464 int val = *valp; 2465 if (val < 0) { 2466 *negp = true; 2467 *lvalp = (unsigned long)-val; 2468 } else { 2469 *negp = false; 2470 *lvalp = (unsigned long)val; 2471 } 2472 } 2473 return 0; 2474 } 2475 2476 /** 2477 * proc_dointvec_minmax - read a vector of integers with min/max values 2478 * @table: the sysctl table 2479 * @write: %TRUE if this is a write to the sysctl file 2480 * @buffer: the user buffer 2481 * @lenp: the size of the user buffer 2482 * @ppos: file position 2483 * 2484 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2485 * values from/to the user buffer, treated as an ASCII string. 2486 * 2487 * This routine will ensure the values are within the range specified by 2488 * table->extra1 (min) and table->extra2 (max). 2489 * 2490 * Returns 0 on success. 2491 */ 2492 int proc_dointvec_minmax(struct ctl_table *table, int write, 2493 void __user *buffer, size_t *lenp, loff_t *ppos) 2494 { 2495 struct do_proc_dointvec_minmax_conv_param param = { 2496 .min = (int *) table->extra1, 2497 .max = (int *) table->extra2, 2498 }; 2499 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2500 do_proc_dointvec_minmax_conv, ¶m); 2501 } 2502 2503 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2504 void __user *buffer, 2505 size_t *lenp, loff_t *ppos, 2506 unsigned long convmul, 2507 unsigned long convdiv) 2508 { 2509 unsigned long *i, *min, *max; 2510 int vleft, first = 1, err = 0; 2511 unsigned long page = 0; 2512 size_t left; 2513 char *kbuf; 2514 2515 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2516 *lenp = 0; 2517 return 0; 2518 } 2519 2520 i = (unsigned long *) data; 2521 min = (unsigned long *) table->extra1; 2522 max = (unsigned long *) table->extra2; 2523 vleft = table->maxlen / sizeof(unsigned long); 2524 left = *lenp; 2525 2526 if (write) { 2527 if (left > PAGE_SIZE - 1) 2528 left = PAGE_SIZE - 1; 2529 page = __get_free_page(GFP_TEMPORARY); 2530 kbuf = (char *) page; 2531 if (!kbuf) 2532 return -ENOMEM; 2533 if (copy_from_user(kbuf, buffer, left)) { 2534 err = -EFAULT; 2535 goto free; 2536 } 2537 kbuf[left] = 0; 2538 } 2539 2540 for (; left && vleft--; i++, first = 0) { 2541 unsigned long val; 2542 2543 if (write) { 2544 bool neg; 2545 2546 left -= proc_skip_spaces(&kbuf); 2547 2548 err = proc_get_long(&kbuf, &left, &val, &neg, 2549 proc_wspace_sep, 2550 sizeof(proc_wspace_sep), NULL); 2551 if (err) 2552 break; 2553 if (neg) 2554 continue; 2555 if ((min && val < *min) || (max && val > *max)) 2556 continue; 2557 *i = val; 2558 } else { 2559 val = convdiv * (*i) / convmul; 2560 if (!first) 2561 err = proc_put_char(&buffer, &left, '\t'); 2562 err = proc_put_long(&buffer, &left, val, false); 2563 if (err) 2564 break; 2565 } 2566 } 2567 2568 if (!write && !first && left && !err) 2569 err = proc_put_char(&buffer, &left, '\n'); 2570 if (write && !err) 2571 left -= proc_skip_spaces(&kbuf); 2572 free: 2573 if (write) { 2574 free_page(page); 2575 if (first) 2576 return err ? : -EINVAL; 2577 } 2578 *lenp -= left; 2579 *ppos += *lenp; 2580 return err; 2581 } 2582 2583 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2584 void __user *buffer, 2585 size_t *lenp, loff_t *ppos, 2586 unsigned long convmul, 2587 unsigned long convdiv) 2588 { 2589 return __do_proc_doulongvec_minmax(table->data, table, write, 2590 buffer, lenp, ppos, convmul, convdiv); 2591 } 2592 2593 /** 2594 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2595 * @table: the sysctl table 2596 * @write: %TRUE if this is a write to the sysctl file 2597 * @buffer: the user buffer 2598 * @lenp: the size of the user buffer 2599 * @ppos: file position 2600 * 2601 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2602 * values from/to the user buffer, treated as an ASCII string. 2603 * 2604 * This routine will ensure the values are within the range specified by 2605 * table->extra1 (min) and table->extra2 (max). 2606 * 2607 * Returns 0 on success. 2608 */ 2609 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2610 void __user *buffer, size_t *lenp, loff_t *ppos) 2611 { 2612 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2613 } 2614 2615 /** 2616 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2617 * @table: the sysctl table 2618 * @write: %TRUE if this is a write to the sysctl file 2619 * @buffer: the user buffer 2620 * @lenp: the size of the user buffer 2621 * @ppos: file position 2622 * 2623 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2624 * values from/to the user buffer, treated as an ASCII string. The values 2625 * are treated as milliseconds, and converted to jiffies when they are stored. 2626 * 2627 * This routine will ensure the values are within the range specified by 2628 * table->extra1 (min) and table->extra2 (max). 2629 * 2630 * Returns 0 on success. 2631 */ 2632 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2633 void __user *buffer, 2634 size_t *lenp, loff_t *ppos) 2635 { 2636 return do_proc_doulongvec_minmax(table, write, buffer, 2637 lenp, ppos, HZ, 1000l); 2638 } 2639 2640 2641 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2642 int *valp, 2643 int write, void *data) 2644 { 2645 if (write) { 2646 if (*lvalp > LONG_MAX / HZ) 2647 return 1; 2648 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2649 } else { 2650 int val = *valp; 2651 unsigned long lval; 2652 if (val < 0) { 2653 *negp = true; 2654 lval = (unsigned long)-val; 2655 } else { 2656 *negp = false; 2657 lval = (unsigned long)val; 2658 } 2659 *lvalp = lval / HZ; 2660 } 2661 return 0; 2662 } 2663 2664 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2665 int *valp, 2666 int write, void *data) 2667 { 2668 if (write) { 2669 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2670 return 1; 2671 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2672 } else { 2673 int val = *valp; 2674 unsigned long lval; 2675 if (val < 0) { 2676 *negp = true; 2677 lval = (unsigned long)-val; 2678 } else { 2679 *negp = false; 2680 lval = (unsigned long)val; 2681 } 2682 *lvalp = jiffies_to_clock_t(lval); 2683 } 2684 return 0; 2685 } 2686 2687 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2688 int *valp, 2689 int write, void *data) 2690 { 2691 if (write) { 2692 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2693 } else { 2694 int val = *valp; 2695 unsigned long lval; 2696 if (val < 0) { 2697 *negp = true; 2698 lval = (unsigned long)-val; 2699 } else { 2700 *negp = false; 2701 lval = (unsigned long)val; 2702 } 2703 *lvalp = jiffies_to_msecs(lval); 2704 } 2705 return 0; 2706 } 2707 2708 /** 2709 * proc_dointvec_jiffies - read a vector of integers as seconds 2710 * @table: the sysctl table 2711 * @write: %TRUE if this is a write to the sysctl file 2712 * @buffer: the user buffer 2713 * @lenp: the size of the user buffer 2714 * @ppos: file position 2715 * 2716 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2717 * values from/to the user buffer, treated as an ASCII string. 2718 * The values read are assumed to be in seconds, and are converted into 2719 * jiffies. 2720 * 2721 * Returns 0 on success. 2722 */ 2723 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2724 void __user *buffer, size_t *lenp, loff_t *ppos) 2725 { 2726 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2727 do_proc_dointvec_jiffies_conv,NULL); 2728 } 2729 2730 /** 2731 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2732 * @table: the sysctl table 2733 * @write: %TRUE if this is a write to the sysctl file 2734 * @buffer: the user buffer 2735 * @lenp: the size of the user buffer 2736 * @ppos: pointer to the file position 2737 * 2738 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2739 * values from/to the user buffer, treated as an ASCII string. 2740 * The values read are assumed to be in 1/USER_HZ seconds, and 2741 * are converted into jiffies. 2742 * 2743 * Returns 0 on success. 2744 */ 2745 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2746 void __user *buffer, size_t *lenp, loff_t *ppos) 2747 { 2748 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2749 do_proc_dointvec_userhz_jiffies_conv,NULL); 2750 } 2751 2752 /** 2753 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2754 * @table: the sysctl table 2755 * @write: %TRUE if this is a write to the sysctl file 2756 * @buffer: the user buffer 2757 * @lenp: the size of the user buffer 2758 * @ppos: file position 2759 * @ppos: the current position in the file 2760 * 2761 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2762 * values from/to the user buffer, treated as an ASCII string. 2763 * The values read are assumed to be in 1/1000 seconds, and 2764 * are converted into jiffies. 2765 * 2766 * Returns 0 on success. 2767 */ 2768 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2769 void __user *buffer, size_t *lenp, loff_t *ppos) 2770 { 2771 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2772 do_proc_dointvec_ms_jiffies_conv, NULL); 2773 } 2774 2775 static int proc_do_cad_pid(struct ctl_table *table, int write, 2776 void __user *buffer, size_t *lenp, loff_t *ppos) 2777 { 2778 struct pid *new_pid; 2779 pid_t tmp; 2780 int r; 2781 2782 tmp = pid_vnr(cad_pid); 2783 2784 r = __do_proc_dointvec(&tmp, table, write, buffer, 2785 lenp, ppos, NULL, NULL); 2786 if (r || !write) 2787 return r; 2788 2789 new_pid = find_get_pid(tmp); 2790 if (!new_pid) 2791 return -ESRCH; 2792 2793 put_pid(xchg(&cad_pid, new_pid)); 2794 return 0; 2795 } 2796 2797 /** 2798 * proc_do_large_bitmap - read/write from/to a large bitmap 2799 * @table: the sysctl table 2800 * @write: %TRUE if this is a write to the sysctl file 2801 * @buffer: the user buffer 2802 * @lenp: the size of the user buffer 2803 * @ppos: file position 2804 * 2805 * The bitmap is stored at table->data and the bitmap length (in bits) 2806 * in table->maxlen. 2807 * 2808 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2809 * large bitmaps may be represented in a compact manner. Writing into 2810 * the file will clear the bitmap then update it with the given input. 2811 * 2812 * Returns 0 on success. 2813 */ 2814 int proc_do_large_bitmap(struct ctl_table *table, int write, 2815 void __user *buffer, size_t *lenp, loff_t *ppos) 2816 { 2817 int err = 0; 2818 bool first = 1; 2819 size_t left = *lenp; 2820 unsigned long bitmap_len = table->maxlen; 2821 unsigned long *bitmap = (unsigned long *) table->data; 2822 unsigned long *tmp_bitmap = NULL; 2823 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2824 2825 if (!bitmap_len || !left || (*ppos && !write)) { 2826 *lenp = 0; 2827 return 0; 2828 } 2829 2830 if (write) { 2831 unsigned long page = 0; 2832 char *kbuf; 2833 2834 if (left > PAGE_SIZE - 1) 2835 left = PAGE_SIZE - 1; 2836 2837 page = __get_free_page(GFP_TEMPORARY); 2838 kbuf = (char *) page; 2839 if (!kbuf) 2840 return -ENOMEM; 2841 if (copy_from_user(kbuf, buffer, left)) { 2842 free_page(page); 2843 return -EFAULT; 2844 } 2845 kbuf[left] = 0; 2846 2847 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2848 GFP_KERNEL); 2849 if (!tmp_bitmap) { 2850 free_page(page); 2851 return -ENOMEM; 2852 } 2853 proc_skip_char(&kbuf, &left, '\n'); 2854 while (!err && left) { 2855 unsigned long val_a, val_b; 2856 bool neg; 2857 2858 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a, 2859 sizeof(tr_a), &c); 2860 if (err) 2861 break; 2862 if (val_a >= bitmap_len || neg) { 2863 err = -EINVAL; 2864 break; 2865 } 2866 2867 val_b = val_a; 2868 if (left) { 2869 kbuf++; 2870 left--; 2871 } 2872 2873 if (c == '-') { 2874 err = proc_get_long(&kbuf, &left, &val_b, 2875 &neg, tr_b, sizeof(tr_b), 2876 &c); 2877 if (err) 2878 break; 2879 if (val_b >= bitmap_len || neg || 2880 val_a > val_b) { 2881 err = -EINVAL; 2882 break; 2883 } 2884 if (left) { 2885 kbuf++; 2886 left--; 2887 } 2888 } 2889 2890 while (val_a <= val_b) 2891 set_bit(val_a++, tmp_bitmap); 2892 2893 first = 0; 2894 proc_skip_char(&kbuf, &left, '\n'); 2895 } 2896 free_page(page); 2897 } else { 2898 unsigned long bit_a, bit_b = 0; 2899 2900 while (left) { 2901 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 2902 if (bit_a >= bitmap_len) 2903 break; 2904 bit_b = find_next_zero_bit(bitmap, bitmap_len, 2905 bit_a + 1) - 1; 2906 2907 if (!first) { 2908 err = proc_put_char(&buffer, &left, ','); 2909 if (err) 2910 break; 2911 } 2912 err = proc_put_long(&buffer, &left, bit_a, false); 2913 if (err) 2914 break; 2915 if (bit_a != bit_b) { 2916 err = proc_put_char(&buffer, &left, '-'); 2917 if (err) 2918 break; 2919 err = proc_put_long(&buffer, &left, bit_b, false); 2920 if (err) 2921 break; 2922 } 2923 2924 first = 0; bit_b++; 2925 } 2926 if (!err) 2927 err = proc_put_char(&buffer, &left, '\n'); 2928 } 2929 2930 if (!err) { 2931 if (write) { 2932 if (*ppos) 2933 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 2934 else 2935 memcpy(bitmap, tmp_bitmap, 2936 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long)); 2937 } 2938 kfree(tmp_bitmap); 2939 *lenp -= left; 2940 *ppos += *lenp; 2941 return 0; 2942 } else { 2943 kfree(tmp_bitmap); 2944 return err; 2945 } 2946 } 2947 2948 #else /* CONFIG_PROC_SYSCTL */ 2949 2950 int proc_dostring(struct ctl_table *table, int write, 2951 void __user *buffer, size_t *lenp, loff_t *ppos) 2952 { 2953 return -ENOSYS; 2954 } 2955 2956 int proc_dointvec(struct ctl_table *table, int write, 2957 void __user *buffer, size_t *lenp, loff_t *ppos) 2958 { 2959 return -ENOSYS; 2960 } 2961 2962 int proc_dointvec_minmax(struct ctl_table *table, int write, 2963 void __user *buffer, size_t *lenp, loff_t *ppos) 2964 { 2965 return -ENOSYS; 2966 } 2967 2968 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2969 void __user *buffer, size_t *lenp, loff_t *ppos) 2970 { 2971 return -ENOSYS; 2972 } 2973 2974 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2975 void __user *buffer, size_t *lenp, loff_t *ppos) 2976 { 2977 return -ENOSYS; 2978 } 2979 2980 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2981 void __user *buffer, size_t *lenp, loff_t *ppos) 2982 { 2983 return -ENOSYS; 2984 } 2985 2986 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2987 void __user *buffer, size_t *lenp, loff_t *ppos) 2988 { 2989 return -ENOSYS; 2990 } 2991 2992 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2993 void __user *buffer, 2994 size_t *lenp, loff_t *ppos) 2995 { 2996 return -ENOSYS; 2997 } 2998 2999 3000 #endif /* CONFIG_PROC_SYSCTL */ 3001 3002 /* 3003 * No sense putting this after each symbol definition, twice, 3004 * exception granted :-) 3005 */ 3006 EXPORT_SYMBOL(proc_dointvec); 3007 EXPORT_SYMBOL(proc_dointvec_jiffies); 3008 EXPORT_SYMBOL(proc_dointvec_minmax); 3009 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3010 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3011 EXPORT_SYMBOL(proc_dostring); 3012 EXPORT_SYMBOL(proc_doulongvec_minmax); 3013 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3014 EXPORT_SYMBOL(register_sysctl_table); 3015 EXPORT_SYMBOL(register_sysctl_paths); 3016 EXPORT_SYMBOL(unregister_sysctl_table); 3017