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