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/proc_fs.h> 27 #include <linux/security.h> 28 #include <linux/ctype.h> 29 #include <linux/utsname.h> 30 #include <linux/kmemcheck.h> 31 #include <linux/smp_lock.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/hugetlb.h> 41 #include <linux/initrd.h> 42 #include <linux/key.h> 43 #include <linux/times.h> 44 #include <linux/limits.h> 45 #include <linux/dcache.h> 46 #include <linux/syscalls.h> 47 #include <linux/vmstat.h> 48 #include <linux/nfs_fs.h> 49 #include <linux/acpi.h> 50 #include <linux/reboot.h> 51 #include <linux/ftrace.h> 52 #include <linux/slow-work.h> 53 #include <linux/perf_counter.h> 54 55 #include <asm/uaccess.h> 56 #include <asm/processor.h> 57 58 #ifdef CONFIG_X86 59 #include <asm/nmi.h> 60 #include <asm/stacktrace.h> 61 #include <asm/io.h> 62 #endif 63 64 static int deprecated_sysctl_warning(struct __sysctl_args *args); 65 66 #if defined(CONFIG_SYSCTL) 67 68 /* External variables not in a header file. */ 69 extern int C_A_D; 70 extern int print_fatal_signals; 71 extern int sysctl_overcommit_memory; 72 extern int sysctl_overcommit_ratio; 73 extern int sysctl_panic_on_oom; 74 extern int sysctl_oom_kill_allocating_task; 75 extern int sysctl_oom_dump_tasks; 76 extern int max_threads; 77 extern int core_uses_pid; 78 extern int suid_dumpable; 79 extern char core_pattern[]; 80 extern int pid_max; 81 extern int min_free_kbytes; 82 extern int pid_max_min, pid_max_max; 83 extern int sysctl_drop_caches; 84 extern int percpu_pagelist_fraction; 85 extern int compat_log; 86 extern int latencytop_enabled; 87 extern int sysctl_nr_open_min, sysctl_nr_open_max; 88 #ifndef CONFIG_MMU 89 extern int sysctl_nr_trim_pages; 90 #endif 91 #ifdef CONFIG_RCU_TORTURE_TEST 92 extern int rcutorture_runnable; 93 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ 94 #ifdef CONFIG_BLOCK 95 extern int blk_iopoll_enabled; 96 #endif 97 98 /* Constants used for minimum and maximum */ 99 #ifdef CONFIG_DETECT_SOFTLOCKUP 100 static int sixty = 60; 101 static int neg_one = -1; 102 #endif 103 104 static int zero; 105 static int __maybe_unused one = 1; 106 static int __maybe_unused two = 2; 107 static unsigned long one_ul = 1; 108 static int one_hundred = 100; 109 110 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 111 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 112 113 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 114 static int maxolduid = 65535; 115 static int minolduid; 116 static int min_percpu_pagelist_fract = 8; 117 118 static int ngroups_max = NGROUPS_MAX; 119 120 #ifdef CONFIG_MODULES 121 extern char modprobe_path[]; 122 extern int modules_disabled; 123 #endif 124 #ifdef CONFIG_CHR_DEV_SG 125 extern int sg_big_buff; 126 #endif 127 128 #ifdef CONFIG_SPARC 129 #include <asm/system.h> 130 #endif 131 132 #ifdef CONFIG_SPARC64 133 extern int sysctl_tsb_ratio; 134 #endif 135 136 #ifdef __hppa__ 137 extern int pwrsw_enabled; 138 extern int unaligned_enabled; 139 #endif 140 141 #ifdef CONFIG_S390 142 #ifdef CONFIG_MATHEMU 143 extern int sysctl_ieee_emulation_warnings; 144 #endif 145 extern int sysctl_userprocess_debug; 146 extern int spin_retry; 147 #endif 148 149 #ifdef CONFIG_BSD_PROCESS_ACCT 150 extern int acct_parm[]; 151 #endif 152 153 #ifdef CONFIG_IA64 154 extern int no_unaligned_warning; 155 extern int unaligned_dump_stack; 156 #endif 157 158 #ifdef CONFIG_RT_MUTEXES 159 extern int max_lock_depth; 160 #endif 161 162 #ifdef CONFIG_PROC_SYSCTL 163 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 164 void __user *buffer, size_t *lenp, loff_t *ppos); 165 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 166 void __user *buffer, size_t *lenp, loff_t *ppos); 167 #endif 168 169 static struct ctl_table root_table[]; 170 static struct ctl_table_root sysctl_table_root; 171 static struct ctl_table_header root_table_header = { 172 .count = 1, 173 .ctl_table = root_table, 174 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 175 .root = &sysctl_table_root, 176 .set = &sysctl_table_root.default_set, 177 }; 178 static struct ctl_table_root sysctl_table_root = { 179 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 180 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 181 }; 182 183 static struct ctl_table kern_table[]; 184 static struct ctl_table vm_table[]; 185 static struct ctl_table fs_table[]; 186 static struct ctl_table debug_table[]; 187 static struct ctl_table dev_table[]; 188 extern struct ctl_table random_table[]; 189 #ifdef CONFIG_INOTIFY_USER 190 extern struct ctl_table inotify_table[]; 191 #endif 192 #ifdef CONFIG_EPOLL 193 extern struct ctl_table epoll_table[]; 194 #endif 195 196 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 197 int sysctl_legacy_va_layout; 198 #endif 199 200 extern int prove_locking; 201 extern int lock_stat; 202 203 /* The default sysctl tables: */ 204 205 static struct ctl_table root_table[] = { 206 { 207 .ctl_name = CTL_KERN, 208 .procname = "kernel", 209 .mode = 0555, 210 .child = kern_table, 211 }, 212 { 213 .ctl_name = CTL_VM, 214 .procname = "vm", 215 .mode = 0555, 216 .child = vm_table, 217 }, 218 { 219 .ctl_name = CTL_FS, 220 .procname = "fs", 221 .mode = 0555, 222 .child = fs_table, 223 }, 224 { 225 .ctl_name = CTL_DEBUG, 226 .procname = "debug", 227 .mode = 0555, 228 .child = debug_table, 229 }, 230 { 231 .ctl_name = CTL_DEV, 232 .procname = "dev", 233 .mode = 0555, 234 .child = dev_table, 235 }, 236 /* 237 * NOTE: do not add new entries to this table unless you have read 238 * Documentation/sysctl/ctl_unnumbered.txt 239 */ 240 { .ctl_name = 0 } 241 }; 242 243 #ifdef CONFIG_SCHED_DEBUG 244 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 245 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 246 static int min_wakeup_granularity_ns; /* 0 usecs */ 247 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 248 #endif 249 250 static struct ctl_table kern_table[] = { 251 { 252 .ctl_name = CTL_UNNUMBERED, 253 .procname = "sched_child_runs_first", 254 .data = &sysctl_sched_child_runs_first, 255 .maxlen = sizeof(unsigned int), 256 .mode = 0644, 257 .proc_handler = &proc_dointvec, 258 }, 259 #ifdef CONFIG_SCHED_DEBUG 260 { 261 .ctl_name = CTL_UNNUMBERED, 262 .procname = "sched_min_granularity_ns", 263 .data = &sysctl_sched_min_granularity, 264 .maxlen = sizeof(unsigned int), 265 .mode = 0644, 266 .proc_handler = &sched_nr_latency_handler, 267 .strategy = &sysctl_intvec, 268 .extra1 = &min_sched_granularity_ns, 269 .extra2 = &max_sched_granularity_ns, 270 }, 271 { 272 .ctl_name = CTL_UNNUMBERED, 273 .procname = "sched_latency_ns", 274 .data = &sysctl_sched_latency, 275 .maxlen = sizeof(unsigned int), 276 .mode = 0644, 277 .proc_handler = &sched_nr_latency_handler, 278 .strategy = &sysctl_intvec, 279 .extra1 = &min_sched_granularity_ns, 280 .extra2 = &max_sched_granularity_ns, 281 }, 282 { 283 .ctl_name = CTL_UNNUMBERED, 284 .procname = "sched_wakeup_granularity_ns", 285 .data = &sysctl_sched_wakeup_granularity, 286 .maxlen = sizeof(unsigned int), 287 .mode = 0644, 288 .proc_handler = &proc_dointvec_minmax, 289 .strategy = &sysctl_intvec, 290 .extra1 = &min_wakeup_granularity_ns, 291 .extra2 = &max_wakeup_granularity_ns, 292 }, 293 { 294 .ctl_name = CTL_UNNUMBERED, 295 .procname = "sched_shares_ratelimit", 296 .data = &sysctl_sched_shares_ratelimit, 297 .maxlen = sizeof(unsigned int), 298 .mode = 0644, 299 .proc_handler = &proc_dointvec, 300 }, 301 { 302 .ctl_name = CTL_UNNUMBERED, 303 .procname = "sched_shares_thresh", 304 .data = &sysctl_sched_shares_thresh, 305 .maxlen = sizeof(unsigned int), 306 .mode = 0644, 307 .proc_handler = &proc_dointvec_minmax, 308 .strategy = &sysctl_intvec, 309 .extra1 = &zero, 310 }, 311 { 312 .ctl_name = CTL_UNNUMBERED, 313 .procname = "sched_features", 314 .data = &sysctl_sched_features, 315 .maxlen = sizeof(unsigned int), 316 .mode = 0644, 317 .proc_handler = &proc_dointvec, 318 }, 319 { 320 .ctl_name = CTL_UNNUMBERED, 321 .procname = "sched_migration_cost", 322 .data = &sysctl_sched_migration_cost, 323 .maxlen = sizeof(unsigned int), 324 .mode = 0644, 325 .proc_handler = &proc_dointvec, 326 }, 327 { 328 .ctl_name = CTL_UNNUMBERED, 329 .procname = "sched_nr_migrate", 330 .data = &sysctl_sched_nr_migrate, 331 .maxlen = sizeof(unsigned int), 332 .mode = 0644, 333 .proc_handler = &proc_dointvec, 334 }, 335 { 336 .ctl_name = CTL_UNNUMBERED, 337 .procname = "sched_time_avg", 338 .data = &sysctl_sched_time_avg, 339 .maxlen = sizeof(unsigned int), 340 .mode = 0644, 341 .proc_handler = &proc_dointvec, 342 }, 343 { 344 .ctl_name = CTL_UNNUMBERED, 345 .procname = "timer_migration", 346 .data = &sysctl_timer_migration, 347 .maxlen = sizeof(unsigned int), 348 .mode = 0644, 349 .proc_handler = &proc_dointvec_minmax, 350 .strategy = &sysctl_intvec, 351 .extra1 = &zero, 352 .extra2 = &one, 353 }, 354 #endif 355 { 356 .ctl_name = CTL_UNNUMBERED, 357 .procname = "sched_rt_period_us", 358 .data = &sysctl_sched_rt_period, 359 .maxlen = sizeof(unsigned int), 360 .mode = 0644, 361 .proc_handler = &sched_rt_handler, 362 }, 363 { 364 .ctl_name = CTL_UNNUMBERED, 365 .procname = "sched_rt_runtime_us", 366 .data = &sysctl_sched_rt_runtime, 367 .maxlen = sizeof(int), 368 .mode = 0644, 369 .proc_handler = &sched_rt_handler, 370 }, 371 { 372 .ctl_name = CTL_UNNUMBERED, 373 .procname = "sched_compat_yield", 374 .data = &sysctl_sched_compat_yield, 375 .maxlen = sizeof(unsigned int), 376 .mode = 0644, 377 .proc_handler = &proc_dointvec, 378 }, 379 #ifdef CONFIG_PROVE_LOCKING 380 { 381 .ctl_name = CTL_UNNUMBERED, 382 .procname = "prove_locking", 383 .data = &prove_locking, 384 .maxlen = sizeof(int), 385 .mode = 0644, 386 .proc_handler = &proc_dointvec, 387 }, 388 #endif 389 #ifdef CONFIG_LOCK_STAT 390 { 391 .ctl_name = CTL_UNNUMBERED, 392 .procname = "lock_stat", 393 .data = &lock_stat, 394 .maxlen = sizeof(int), 395 .mode = 0644, 396 .proc_handler = &proc_dointvec, 397 }, 398 #endif 399 { 400 .ctl_name = KERN_PANIC, 401 .procname = "panic", 402 .data = &panic_timeout, 403 .maxlen = sizeof(int), 404 .mode = 0644, 405 .proc_handler = &proc_dointvec, 406 }, 407 { 408 .ctl_name = KERN_CORE_USES_PID, 409 .procname = "core_uses_pid", 410 .data = &core_uses_pid, 411 .maxlen = sizeof(int), 412 .mode = 0644, 413 .proc_handler = &proc_dointvec, 414 }, 415 { 416 .ctl_name = KERN_CORE_PATTERN, 417 .procname = "core_pattern", 418 .data = core_pattern, 419 .maxlen = CORENAME_MAX_SIZE, 420 .mode = 0644, 421 .proc_handler = &proc_dostring, 422 .strategy = &sysctl_string, 423 }, 424 #ifdef CONFIG_PROC_SYSCTL 425 { 426 .procname = "tainted", 427 .maxlen = sizeof(long), 428 .mode = 0644, 429 .proc_handler = &proc_taint, 430 }, 431 #endif 432 #ifdef CONFIG_LATENCYTOP 433 { 434 .procname = "latencytop", 435 .data = &latencytop_enabled, 436 .maxlen = sizeof(int), 437 .mode = 0644, 438 .proc_handler = &proc_dointvec, 439 }, 440 #endif 441 #ifdef CONFIG_BLK_DEV_INITRD 442 { 443 .ctl_name = KERN_REALROOTDEV, 444 .procname = "real-root-dev", 445 .data = &real_root_dev, 446 .maxlen = sizeof(int), 447 .mode = 0644, 448 .proc_handler = &proc_dointvec, 449 }, 450 #endif 451 { 452 .ctl_name = CTL_UNNUMBERED, 453 .procname = "print-fatal-signals", 454 .data = &print_fatal_signals, 455 .maxlen = sizeof(int), 456 .mode = 0644, 457 .proc_handler = &proc_dointvec, 458 }, 459 #ifdef CONFIG_SPARC 460 { 461 .ctl_name = KERN_SPARC_REBOOT, 462 .procname = "reboot-cmd", 463 .data = reboot_command, 464 .maxlen = 256, 465 .mode = 0644, 466 .proc_handler = &proc_dostring, 467 .strategy = &sysctl_string, 468 }, 469 { 470 .ctl_name = KERN_SPARC_STOP_A, 471 .procname = "stop-a", 472 .data = &stop_a_enabled, 473 .maxlen = sizeof (int), 474 .mode = 0644, 475 .proc_handler = &proc_dointvec, 476 }, 477 { 478 .ctl_name = KERN_SPARC_SCONS_PWROFF, 479 .procname = "scons-poweroff", 480 .data = &scons_pwroff, 481 .maxlen = sizeof (int), 482 .mode = 0644, 483 .proc_handler = &proc_dointvec, 484 }, 485 #endif 486 #ifdef CONFIG_SPARC64 487 { 488 .ctl_name = CTL_UNNUMBERED, 489 .procname = "tsb-ratio", 490 .data = &sysctl_tsb_ratio, 491 .maxlen = sizeof (int), 492 .mode = 0644, 493 .proc_handler = &proc_dointvec, 494 }, 495 #endif 496 #ifdef __hppa__ 497 { 498 .ctl_name = KERN_HPPA_PWRSW, 499 .procname = "soft-power", 500 .data = &pwrsw_enabled, 501 .maxlen = sizeof (int), 502 .mode = 0644, 503 .proc_handler = &proc_dointvec, 504 }, 505 { 506 .ctl_name = KERN_HPPA_UNALIGNED, 507 .procname = "unaligned-trap", 508 .data = &unaligned_enabled, 509 .maxlen = sizeof (int), 510 .mode = 0644, 511 .proc_handler = &proc_dointvec, 512 }, 513 #endif 514 { 515 .ctl_name = KERN_CTLALTDEL, 516 .procname = "ctrl-alt-del", 517 .data = &C_A_D, 518 .maxlen = sizeof(int), 519 .mode = 0644, 520 .proc_handler = &proc_dointvec, 521 }, 522 #ifdef CONFIG_FUNCTION_TRACER 523 { 524 .ctl_name = CTL_UNNUMBERED, 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 .ctl_name = CTL_UNNUMBERED, 535 .procname = "stack_tracer_enabled", 536 .data = &stack_tracer_enabled, 537 .maxlen = sizeof(int), 538 .mode = 0644, 539 .proc_handler = &stack_trace_sysctl, 540 }, 541 #endif 542 #ifdef CONFIG_TRACING 543 { 544 .ctl_name = CTL_UNNUMBERED, 545 .procname = "ftrace_dump_on_oops", 546 .data = &ftrace_dump_on_oops, 547 .maxlen = sizeof(int), 548 .mode = 0644, 549 .proc_handler = &proc_dointvec, 550 }, 551 #endif 552 #ifdef CONFIG_MODULES 553 { 554 .ctl_name = KERN_MODPROBE, 555 .procname = "modprobe", 556 .data = &modprobe_path, 557 .maxlen = KMOD_PATH_LEN, 558 .mode = 0644, 559 .proc_handler = &proc_dostring, 560 .strategy = &sysctl_string, 561 }, 562 { 563 .ctl_name = CTL_UNNUMBERED, 564 .procname = "modules_disabled", 565 .data = &modules_disabled, 566 .maxlen = sizeof(int), 567 .mode = 0644, 568 /* only handle a transition from default "0" to "1" */ 569 .proc_handler = &proc_dointvec_minmax, 570 .extra1 = &one, 571 .extra2 = &one, 572 }, 573 #endif 574 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 575 { 576 .ctl_name = KERN_HOTPLUG, 577 .procname = "hotplug", 578 .data = &uevent_helper, 579 .maxlen = UEVENT_HELPER_PATH_LEN, 580 .mode = 0644, 581 .proc_handler = &proc_dostring, 582 .strategy = &sysctl_string, 583 }, 584 #endif 585 #ifdef CONFIG_CHR_DEV_SG 586 { 587 .ctl_name = KERN_SG_BIG_BUFF, 588 .procname = "sg-big-buff", 589 .data = &sg_big_buff, 590 .maxlen = sizeof (int), 591 .mode = 0444, 592 .proc_handler = &proc_dointvec, 593 }, 594 #endif 595 #ifdef CONFIG_BSD_PROCESS_ACCT 596 { 597 .ctl_name = KERN_ACCT, 598 .procname = "acct", 599 .data = &acct_parm, 600 .maxlen = 3*sizeof(int), 601 .mode = 0644, 602 .proc_handler = &proc_dointvec, 603 }, 604 #endif 605 #ifdef CONFIG_MAGIC_SYSRQ 606 { 607 .ctl_name = KERN_SYSRQ, 608 .procname = "sysrq", 609 .data = &__sysrq_enabled, 610 .maxlen = sizeof (int), 611 .mode = 0644, 612 .proc_handler = &proc_dointvec, 613 }, 614 #endif 615 #ifdef CONFIG_PROC_SYSCTL 616 { 617 .procname = "cad_pid", 618 .data = NULL, 619 .maxlen = sizeof (int), 620 .mode = 0600, 621 .proc_handler = &proc_do_cad_pid, 622 }, 623 #endif 624 { 625 .ctl_name = KERN_MAX_THREADS, 626 .procname = "threads-max", 627 .data = &max_threads, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 .proc_handler = &proc_dointvec, 631 }, 632 { 633 .ctl_name = KERN_RANDOM, 634 .procname = "random", 635 .mode = 0555, 636 .child = random_table, 637 }, 638 { 639 .ctl_name = KERN_OVERFLOWUID, 640 .procname = "overflowuid", 641 .data = &overflowuid, 642 .maxlen = sizeof(int), 643 .mode = 0644, 644 .proc_handler = &proc_dointvec_minmax, 645 .strategy = &sysctl_intvec, 646 .extra1 = &minolduid, 647 .extra2 = &maxolduid, 648 }, 649 { 650 .ctl_name = KERN_OVERFLOWGID, 651 .procname = "overflowgid", 652 .data = &overflowgid, 653 .maxlen = sizeof(int), 654 .mode = 0644, 655 .proc_handler = &proc_dointvec_minmax, 656 .strategy = &sysctl_intvec, 657 .extra1 = &minolduid, 658 .extra2 = &maxolduid, 659 }, 660 #ifdef CONFIG_S390 661 #ifdef CONFIG_MATHEMU 662 { 663 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 664 .procname = "ieee_emulation_warnings", 665 .data = &sysctl_ieee_emulation_warnings, 666 .maxlen = sizeof(int), 667 .mode = 0644, 668 .proc_handler = &proc_dointvec, 669 }, 670 #endif 671 { 672 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 673 .procname = "userprocess_debug", 674 .data = &sysctl_userprocess_debug, 675 .maxlen = sizeof(int), 676 .mode = 0644, 677 .proc_handler = &proc_dointvec, 678 }, 679 #endif 680 { 681 .ctl_name = KERN_PIDMAX, 682 .procname = "pid_max", 683 .data = &pid_max, 684 .maxlen = sizeof (int), 685 .mode = 0644, 686 .proc_handler = &proc_dointvec_minmax, 687 .strategy = sysctl_intvec, 688 .extra1 = &pid_max_min, 689 .extra2 = &pid_max_max, 690 }, 691 { 692 .ctl_name = KERN_PANIC_ON_OOPS, 693 .procname = "panic_on_oops", 694 .data = &panic_on_oops, 695 .maxlen = sizeof(int), 696 .mode = 0644, 697 .proc_handler = &proc_dointvec, 698 }, 699 #if defined CONFIG_PRINTK 700 { 701 .ctl_name = KERN_PRINTK, 702 .procname = "printk", 703 .data = &console_loglevel, 704 .maxlen = 4*sizeof(int), 705 .mode = 0644, 706 .proc_handler = &proc_dointvec, 707 }, 708 { 709 .ctl_name = KERN_PRINTK_RATELIMIT, 710 .procname = "printk_ratelimit", 711 .data = &printk_ratelimit_state.interval, 712 .maxlen = sizeof(int), 713 .mode = 0644, 714 .proc_handler = &proc_dointvec_jiffies, 715 .strategy = &sysctl_jiffies, 716 }, 717 { 718 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 719 .procname = "printk_ratelimit_burst", 720 .data = &printk_ratelimit_state.burst, 721 .maxlen = sizeof(int), 722 .mode = 0644, 723 .proc_handler = &proc_dointvec, 724 }, 725 #endif 726 { 727 .ctl_name = KERN_NGROUPS_MAX, 728 .procname = "ngroups_max", 729 .data = &ngroups_max, 730 .maxlen = sizeof (int), 731 .mode = 0444, 732 .proc_handler = &proc_dointvec, 733 }, 734 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 735 { 736 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 737 .procname = "unknown_nmi_panic", 738 .data = &unknown_nmi_panic, 739 .maxlen = sizeof (int), 740 .mode = 0644, 741 .proc_handler = &proc_dointvec, 742 }, 743 { 744 .procname = "nmi_watchdog", 745 .data = &nmi_watchdog_enabled, 746 .maxlen = sizeof (int), 747 .mode = 0644, 748 .proc_handler = &proc_nmi_enabled, 749 }, 750 #endif 751 #if defined(CONFIG_X86) 752 { 753 .ctl_name = KERN_PANIC_ON_NMI, 754 .procname = "panic_on_unrecovered_nmi", 755 .data = &panic_on_unrecovered_nmi, 756 .maxlen = sizeof(int), 757 .mode = 0644, 758 .proc_handler = &proc_dointvec, 759 }, 760 { 761 .ctl_name = CTL_UNNUMBERED, 762 .procname = "panic_on_io_nmi", 763 .data = &panic_on_io_nmi, 764 .maxlen = sizeof(int), 765 .mode = 0644, 766 .proc_handler = &proc_dointvec, 767 }, 768 { 769 .ctl_name = KERN_BOOTLOADER_TYPE, 770 .procname = "bootloader_type", 771 .data = &bootloader_type, 772 .maxlen = sizeof (int), 773 .mode = 0444, 774 .proc_handler = &proc_dointvec, 775 }, 776 { 777 .ctl_name = CTL_UNNUMBERED, 778 .procname = "bootloader_version", 779 .data = &bootloader_version, 780 .maxlen = sizeof (int), 781 .mode = 0444, 782 .proc_handler = &proc_dointvec, 783 }, 784 { 785 .ctl_name = CTL_UNNUMBERED, 786 .procname = "kstack_depth_to_print", 787 .data = &kstack_depth_to_print, 788 .maxlen = sizeof(int), 789 .mode = 0644, 790 .proc_handler = &proc_dointvec, 791 }, 792 { 793 .ctl_name = CTL_UNNUMBERED, 794 .procname = "io_delay_type", 795 .data = &io_delay_type, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = &proc_dointvec, 799 }, 800 #endif 801 #if defined(CONFIG_MMU) 802 { 803 .ctl_name = KERN_RANDOMIZE, 804 .procname = "randomize_va_space", 805 .data = &randomize_va_space, 806 .maxlen = sizeof(int), 807 .mode = 0644, 808 .proc_handler = &proc_dointvec, 809 }, 810 #endif 811 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 812 { 813 .ctl_name = KERN_SPIN_RETRY, 814 .procname = "spin_retry", 815 .data = &spin_retry, 816 .maxlen = sizeof (int), 817 .mode = 0644, 818 .proc_handler = &proc_dointvec, 819 }, 820 #endif 821 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 822 { 823 .procname = "acpi_video_flags", 824 .data = &acpi_realmode_flags, 825 .maxlen = sizeof (unsigned long), 826 .mode = 0644, 827 .proc_handler = &proc_doulongvec_minmax, 828 }, 829 #endif 830 #ifdef CONFIG_IA64 831 { 832 .ctl_name = KERN_IA64_UNALIGNED, 833 .procname = "ignore-unaligned-usertrap", 834 .data = &no_unaligned_warning, 835 .maxlen = sizeof (int), 836 .mode = 0644, 837 .proc_handler = &proc_dointvec, 838 }, 839 { 840 .ctl_name = CTL_UNNUMBERED, 841 .procname = "unaligned-dump-stack", 842 .data = &unaligned_dump_stack, 843 .maxlen = sizeof (int), 844 .mode = 0644, 845 .proc_handler = &proc_dointvec, 846 }, 847 #endif 848 #ifdef CONFIG_DETECT_SOFTLOCKUP 849 { 850 .ctl_name = CTL_UNNUMBERED, 851 .procname = "softlockup_panic", 852 .data = &softlockup_panic, 853 .maxlen = sizeof(int), 854 .mode = 0644, 855 .proc_handler = &proc_dointvec_minmax, 856 .strategy = &sysctl_intvec, 857 .extra1 = &zero, 858 .extra2 = &one, 859 }, 860 { 861 .ctl_name = CTL_UNNUMBERED, 862 .procname = "softlockup_thresh", 863 .data = &softlockup_thresh, 864 .maxlen = sizeof(int), 865 .mode = 0644, 866 .proc_handler = &proc_dosoftlockup_thresh, 867 .strategy = &sysctl_intvec, 868 .extra1 = &neg_one, 869 .extra2 = &sixty, 870 }, 871 #endif 872 #ifdef CONFIG_DETECT_HUNG_TASK 873 { 874 .ctl_name = CTL_UNNUMBERED, 875 .procname = "hung_task_panic", 876 .data = &sysctl_hung_task_panic, 877 .maxlen = sizeof(int), 878 .mode = 0644, 879 .proc_handler = &proc_dointvec_minmax, 880 .strategy = &sysctl_intvec, 881 .extra1 = &zero, 882 .extra2 = &one, 883 }, 884 { 885 .ctl_name = CTL_UNNUMBERED, 886 .procname = "hung_task_check_count", 887 .data = &sysctl_hung_task_check_count, 888 .maxlen = sizeof(unsigned long), 889 .mode = 0644, 890 .proc_handler = &proc_doulongvec_minmax, 891 .strategy = &sysctl_intvec, 892 }, 893 { 894 .ctl_name = CTL_UNNUMBERED, 895 .procname = "hung_task_timeout_secs", 896 .data = &sysctl_hung_task_timeout_secs, 897 .maxlen = sizeof(unsigned long), 898 .mode = 0644, 899 .proc_handler = &proc_dohung_task_timeout_secs, 900 .strategy = &sysctl_intvec, 901 }, 902 { 903 .ctl_name = CTL_UNNUMBERED, 904 .procname = "hung_task_warnings", 905 .data = &sysctl_hung_task_warnings, 906 .maxlen = sizeof(unsigned long), 907 .mode = 0644, 908 .proc_handler = &proc_doulongvec_minmax, 909 .strategy = &sysctl_intvec, 910 }, 911 #endif 912 #ifdef CONFIG_COMPAT 913 { 914 .ctl_name = KERN_COMPAT_LOG, 915 .procname = "compat-log", 916 .data = &compat_log, 917 .maxlen = sizeof (int), 918 .mode = 0644, 919 .proc_handler = &proc_dointvec, 920 }, 921 #endif 922 #ifdef CONFIG_RT_MUTEXES 923 { 924 .ctl_name = KERN_MAX_LOCK_DEPTH, 925 .procname = "max_lock_depth", 926 .data = &max_lock_depth, 927 .maxlen = sizeof(int), 928 .mode = 0644, 929 .proc_handler = &proc_dointvec, 930 }, 931 #endif 932 { 933 .ctl_name = CTL_UNNUMBERED, 934 .procname = "poweroff_cmd", 935 .data = &poweroff_cmd, 936 .maxlen = POWEROFF_CMD_PATH_LEN, 937 .mode = 0644, 938 .proc_handler = &proc_dostring, 939 .strategy = &sysctl_string, 940 }, 941 #ifdef CONFIG_KEYS 942 { 943 .ctl_name = CTL_UNNUMBERED, 944 .procname = "keys", 945 .mode = 0555, 946 .child = key_sysctls, 947 }, 948 #endif 949 #ifdef CONFIG_RCU_TORTURE_TEST 950 { 951 .ctl_name = CTL_UNNUMBERED, 952 .procname = "rcutorture_runnable", 953 .data = &rcutorture_runnable, 954 .maxlen = sizeof(int), 955 .mode = 0644, 956 .proc_handler = &proc_dointvec, 957 }, 958 #endif 959 #ifdef CONFIG_SLOW_WORK 960 { 961 .ctl_name = CTL_UNNUMBERED, 962 .procname = "slow-work", 963 .mode = 0555, 964 .child = slow_work_sysctls, 965 }, 966 #endif 967 #ifdef CONFIG_PERF_COUNTERS 968 { 969 .ctl_name = CTL_UNNUMBERED, 970 .procname = "perf_counter_paranoid", 971 .data = &sysctl_perf_counter_paranoid, 972 .maxlen = sizeof(sysctl_perf_counter_paranoid), 973 .mode = 0644, 974 .proc_handler = &proc_dointvec, 975 }, 976 { 977 .ctl_name = CTL_UNNUMBERED, 978 .procname = "perf_counter_mlock_kb", 979 .data = &sysctl_perf_counter_mlock, 980 .maxlen = sizeof(sysctl_perf_counter_mlock), 981 .mode = 0644, 982 .proc_handler = &proc_dointvec, 983 }, 984 { 985 .ctl_name = CTL_UNNUMBERED, 986 .procname = "perf_counter_max_sample_rate", 987 .data = &sysctl_perf_counter_sample_rate, 988 .maxlen = sizeof(sysctl_perf_counter_sample_rate), 989 .mode = 0644, 990 .proc_handler = &proc_dointvec, 991 }, 992 #endif 993 #ifdef CONFIG_KMEMCHECK 994 { 995 .ctl_name = CTL_UNNUMBERED, 996 .procname = "kmemcheck", 997 .data = &kmemcheck_enabled, 998 .maxlen = sizeof(int), 999 .mode = 0644, 1000 .proc_handler = &proc_dointvec, 1001 }, 1002 #endif 1003 #ifdef CONFIG_BLOCK 1004 { 1005 .ctl_name = CTL_UNNUMBERED, 1006 .procname = "blk_iopoll", 1007 .data = &blk_iopoll_enabled, 1008 .maxlen = sizeof(int), 1009 .mode = 0644, 1010 .proc_handler = &proc_dointvec, 1011 }, 1012 #endif 1013 /* 1014 * NOTE: do not add new entries to this table unless you have read 1015 * Documentation/sysctl/ctl_unnumbered.txt 1016 */ 1017 { .ctl_name = 0 } 1018 }; 1019 1020 static struct ctl_table vm_table[] = { 1021 { 1022 .ctl_name = VM_OVERCOMMIT_MEMORY, 1023 .procname = "overcommit_memory", 1024 .data = &sysctl_overcommit_memory, 1025 .maxlen = sizeof(sysctl_overcommit_memory), 1026 .mode = 0644, 1027 .proc_handler = &proc_dointvec, 1028 }, 1029 { 1030 .ctl_name = VM_PANIC_ON_OOM, 1031 .procname = "panic_on_oom", 1032 .data = &sysctl_panic_on_oom, 1033 .maxlen = sizeof(sysctl_panic_on_oom), 1034 .mode = 0644, 1035 .proc_handler = &proc_dointvec, 1036 }, 1037 { 1038 .ctl_name = CTL_UNNUMBERED, 1039 .procname = "oom_kill_allocating_task", 1040 .data = &sysctl_oom_kill_allocating_task, 1041 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1042 .mode = 0644, 1043 .proc_handler = &proc_dointvec, 1044 }, 1045 { 1046 .ctl_name = CTL_UNNUMBERED, 1047 .procname = "oom_dump_tasks", 1048 .data = &sysctl_oom_dump_tasks, 1049 .maxlen = sizeof(sysctl_oom_dump_tasks), 1050 .mode = 0644, 1051 .proc_handler = &proc_dointvec, 1052 }, 1053 { 1054 .ctl_name = VM_OVERCOMMIT_RATIO, 1055 .procname = "overcommit_ratio", 1056 .data = &sysctl_overcommit_ratio, 1057 .maxlen = sizeof(sysctl_overcommit_ratio), 1058 .mode = 0644, 1059 .proc_handler = &proc_dointvec, 1060 }, 1061 { 1062 .ctl_name = VM_PAGE_CLUSTER, 1063 .procname = "page-cluster", 1064 .data = &page_cluster, 1065 .maxlen = sizeof(int), 1066 .mode = 0644, 1067 .proc_handler = &proc_dointvec, 1068 }, 1069 { 1070 .ctl_name = VM_DIRTY_BACKGROUND, 1071 .procname = "dirty_background_ratio", 1072 .data = &dirty_background_ratio, 1073 .maxlen = sizeof(dirty_background_ratio), 1074 .mode = 0644, 1075 .proc_handler = &dirty_background_ratio_handler, 1076 .strategy = &sysctl_intvec, 1077 .extra1 = &zero, 1078 .extra2 = &one_hundred, 1079 }, 1080 { 1081 .ctl_name = CTL_UNNUMBERED, 1082 .procname = "dirty_background_bytes", 1083 .data = &dirty_background_bytes, 1084 .maxlen = sizeof(dirty_background_bytes), 1085 .mode = 0644, 1086 .proc_handler = &dirty_background_bytes_handler, 1087 .strategy = &sysctl_intvec, 1088 .extra1 = &one_ul, 1089 }, 1090 { 1091 .ctl_name = VM_DIRTY_RATIO, 1092 .procname = "dirty_ratio", 1093 .data = &vm_dirty_ratio, 1094 .maxlen = sizeof(vm_dirty_ratio), 1095 .mode = 0644, 1096 .proc_handler = &dirty_ratio_handler, 1097 .strategy = &sysctl_intvec, 1098 .extra1 = &zero, 1099 .extra2 = &one_hundred, 1100 }, 1101 { 1102 .ctl_name = CTL_UNNUMBERED, 1103 .procname = "dirty_bytes", 1104 .data = &vm_dirty_bytes, 1105 .maxlen = sizeof(vm_dirty_bytes), 1106 .mode = 0644, 1107 .proc_handler = &dirty_bytes_handler, 1108 .strategy = &sysctl_intvec, 1109 .extra1 = &dirty_bytes_min, 1110 }, 1111 { 1112 .procname = "dirty_writeback_centisecs", 1113 .data = &dirty_writeback_interval, 1114 .maxlen = sizeof(dirty_writeback_interval), 1115 .mode = 0644, 1116 .proc_handler = &dirty_writeback_centisecs_handler, 1117 }, 1118 { 1119 .procname = "dirty_expire_centisecs", 1120 .data = &dirty_expire_interval, 1121 .maxlen = sizeof(dirty_expire_interval), 1122 .mode = 0644, 1123 .proc_handler = &proc_dointvec, 1124 }, 1125 { 1126 .ctl_name = VM_NR_PDFLUSH_THREADS, 1127 .procname = "nr_pdflush_threads", 1128 .data = &nr_pdflush_threads, 1129 .maxlen = sizeof nr_pdflush_threads, 1130 .mode = 0444 /* read-only*/, 1131 .proc_handler = &proc_dointvec, 1132 }, 1133 { 1134 .ctl_name = VM_SWAPPINESS, 1135 .procname = "swappiness", 1136 .data = &vm_swappiness, 1137 .maxlen = sizeof(vm_swappiness), 1138 .mode = 0644, 1139 .proc_handler = &proc_dointvec_minmax, 1140 .strategy = &sysctl_intvec, 1141 .extra1 = &zero, 1142 .extra2 = &one_hundred, 1143 }, 1144 #ifdef CONFIG_HUGETLB_PAGE 1145 { 1146 .procname = "nr_hugepages", 1147 .data = NULL, 1148 .maxlen = sizeof(unsigned long), 1149 .mode = 0644, 1150 .proc_handler = &hugetlb_sysctl_handler, 1151 .extra1 = (void *)&hugetlb_zero, 1152 .extra2 = (void *)&hugetlb_infinity, 1153 }, 1154 { 1155 .ctl_name = VM_HUGETLB_GROUP, 1156 .procname = "hugetlb_shm_group", 1157 .data = &sysctl_hugetlb_shm_group, 1158 .maxlen = sizeof(gid_t), 1159 .mode = 0644, 1160 .proc_handler = &proc_dointvec, 1161 }, 1162 { 1163 .ctl_name = CTL_UNNUMBERED, 1164 .procname = "hugepages_treat_as_movable", 1165 .data = &hugepages_treat_as_movable, 1166 .maxlen = sizeof(int), 1167 .mode = 0644, 1168 .proc_handler = &hugetlb_treat_movable_handler, 1169 }, 1170 { 1171 .ctl_name = CTL_UNNUMBERED, 1172 .procname = "nr_overcommit_hugepages", 1173 .data = NULL, 1174 .maxlen = sizeof(unsigned long), 1175 .mode = 0644, 1176 .proc_handler = &hugetlb_overcommit_handler, 1177 .extra1 = (void *)&hugetlb_zero, 1178 .extra2 = (void *)&hugetlb_infinity, 1179 }, 1180 #endif 1181 { 1182 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 1183 .procname = "lowmem_reserve_ratio", 1184 .data = &sysctl_lowmem_reserve_ratio, 1185 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1186 .mode = 0644, 1187 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 1188 .strategy = &sysctl_intvec, 1189 }, 1190 { 1191 .ctl_name = VM_DROP_PAGECACHE, 1192 .procname = "drop_caches", 1193 .data = &sysctl_drop_caches, 1194 .maxlen = sizeof(int), 1195 .mode = 0644, 1196 .proc_handler = drop_caches_sysctl_handler, 1197 .strategy = &sysctl_intvec, 1198 }, 1199 { 1200 .ctl_name = VM_MIN_FREE_KBYTES, 1201 .procname = "min_free_kbytes", 1202 .data = &min_free_kbytes, 1203 .maxlen = sizeof(min_free_kbytes), 1204 .mode = 0644, 1205 .proc_handler = &min_free_kbytes_sysctl_handler, 1206 .strategy = &sysctl_intvec, 1207 .extra1 = &zero, 1208 }, 1209 { 1210 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 1211 .procname = "percpu_pagelist_fraction", 1212 .data = &percpu_pagelist_fraction, 1213 .maxlen = sizeof(percpu_pagelist_fraction), 1214 .mode = 0644, 1215 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 1216 .strategy = &sysctl_intvec, 1217 .extra1 = &min_percpu_pagelist_fract, 1218 }, 1219 #ifdef CONFIG_MMU 1220 { 1221 .ctl_name = VM_MAX_MAP_COUNT, 1222 .procname = "max_map_count", 1223 .data = &sysctl_max_map_count, 1224 .maxlen = sizeof(sysctl_max_map_count), 1225 .mode = 0644, 1226 .proc_handler = &proc_dointvec 1227 }, 1228 #else 1229 { 1230 .ctl_name = CTL_UNNUMBERED, 1231 .procname = "nr_trim_pages", 1232 .data = &sysctl_nr_trim_pages, 1233 .maxlen = sizeof(sysctl_nr_trim_pages), 1234 .mode = 0644, 1235 .proc_handler = &proc_dointvec_minmax, 1236 .strategy = &sysctl_intvec, 1237 .extra1 = &zero, 1238 }, 1239 #endif 1240 { 1241 .ctl_name = VM_LAPTOP_MODE, 1242 .procname = "laptop_mode", 1243 .data = &laptop_mode, 1244 .maxlen = sizeof(laptop_mode), 1245 .mode = 0644, 1246 .proc_handler = &proc_dointvec_jiffies, 1247 .strategy = &sysctl_jiffies, 1248 }, 1249 { 1250 .ctl_name = VM_BLOCK_DUMP, 1251 .procname = "block_dump", 1252 .data = &block_dump, 1253 .maxlen = sizeof(block_dump), 1254 .mode = 0644, 1255 .proc_handler = &proc_dointvec, 1256 .strategy = &sysctl_intvec, 1257 .extra1 = &zero, 1258 }, 1259 { 1260 .ctl_name = VM_VFS_CACHE_PRESSURE, 1261 .procname = "vfs_cache_pressure", 1262 .data = &sysctl_vfs_cache_pressure, 1263 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1264 .mode = 0644, 1265 .proc_handler = &proc_dointvec, 1266 .strategy = &sysctl_intvec, 1267 .extra1 = &zero, 1268 }, 1269 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1270 { 1271 .ctl_name = VM_LEGACY_VA_LAYOUT, 1272 .procname = "legacy_va_layout", 1273 .data = &sysctl_legacy_va_layout, 1274 .maxlen = sizeof(sysctl_legacy_va_layout), 1275 .mode = 0644, 1276 .proc_handler = &proc_dointvec, 1277 .strategy = &sysctl_intvec, 1278 .extra1 = &zero, 1279 }, 1280 #endif 1281 #ifdef CONFIG_NUMA 1282 { 1283 .ctl_name = VM_ZONE_RECLAIM_MODE, 1284 .procname = "zone_reclaim_mode", 1285 .data = &zone_reclaim_mode, 1286 .maxlen = sizeof(zone_reclaim_mode), 1287 .mode = 0644, 1288 .proc_handler = &proc_dointvec, 1289 .strategy = &sysctl_intvec, 1290 .extra1 = &zero, 1291 }, 1292 { 1293 .ctl_name = VM_MIN_UNMAPPED, 1294 .procname = "min_unmapped_ratio", 1295 .data = &sysctl_min_unmapped_ratio, 1296 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1297 .mode = 0644, 1298 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, 1299 .strategy = &sysctl_intvec, 1300 .extra1 = &zero, 1301 .extra2 = &one_hundred, 1302 }, 1303 { 1304 .ctl_name = VM_MIN_SLAB, 1305 .procname = "min_slab_ratio", 1306 .data = &sysctl_min_slab_ratio, 1307 .maxlen = sizeof(sysctl_min_slab_ratio), 1308 .mode = 0644, 1309 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, 1310 .strategy = &sysctl_intvec, 1311 .extra1 = &zero, 1312 .extra2 = &one_hundred, 1313 }, 1314 #endif 1315 #ifdef CONFIG_SMP 1316 { 1317 .ctl_name = CTL_UNNUMBERED, 1318 .procname = "stat_interval", 1319 .data = &sysctl_stat_interval, 1320 .maxlen = sizeof(sysctl_stat_interval), 1321 .mode = 0644, 1322 .proc_handler = &proc_dointvec_jiffies, 1323 .strategy = &sysctl_jiffies, 1324 }, 1325 #endif 1326 { 1327 .ctl_name = CTL_UNNUMBERED, 1328 .procname = "mmap_min_addr", 1329 .data = &dac_mmap_min_addr, 1330 .maxlen = sizeof(unsigned long), 1331 .mode = 0644, 1332 .proc_handler = &mmap_min_addr_handler, 1333 }, 1334 #ifdef CONFIG_NUMA 1335 { 1336 .ctl_name = CTL_UNNUMBERED, 1337 .procname = "numa_zonelist_order", 1338 .data = &numa_zonelist_order, 1339 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1340 .mode = 0644, 1341 .proc_handler = &numa_zonelist_order_handler, 1342 .strategy = &sysctl_string, 1343 }, 1344 #endif 1345 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1346 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1347 { 1348 .ctl_name = VM_VDSO_ENABLED, 1349 .procname = "vdso_enabled", 1350 .data = &vdso_enabled, 1351 .maxlen = sizeof(vdso_enabled), 1352 .mode = 0644, 1353 .proc_handler = &proc_dointvec, 1354 .strategy = &sysctl_intvec, 1355 .extra1 = &zero, 1356 }, 1357 #endif 1358 #ifdef CONFIG_HIGHMEM 1359 { 1360 .ctl_name = CTL_UNNUMBERED, 1361 .procname = "highmem_is_dirtyable", 1362 .data = &vm_highmem_is_dirtyable, 1363 .maxlen = sizeof(vm_highmem_is_dirtyable), 1364 .mode = 0644, 1365 .proc_handler = &proc_dointvec_minmax, 1366 .strategy = &sysctl_intvec, 1367 .extra1 = &zero, 1368 .extra2 = &one, 1369 }, 1370 #endif 1371 { 1372 .ctl_name = CTL_UNNUMBERED, 1373 .procname = "scan_unevictable_pages", 1374 .data = &scan_unevictable_pages, 1375 .maxlen = sizeof(scan_unevictable_pages), 1376 .mode = 0644, 1377 .proc_handler = &scan_unevictable_handler, 1378 }, 1379 /* 1380 * NOTE: do not add new entries to this table unless you have read 1381 * Documentation/sysctl/ctl_unnumbered.txt 1382 */ 1383 { .ctl_name = 0 } 1384 }; 1385 1386 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1387 static struct ctl_table binfmt_misc_table[] = { 1388 { .ctl_name = 0 } 1389 }; 1390 #endif 1391 1392 static struct ctl_table fs_table[] = { 1393 { 1394 .ctl_name = FS_NRINODE, 1395 .procname = "inode-nr", 1396 .data = &inodes_stat, 1397 .maxlen = 2*sizeof(int), 1398 .mode = 0444, 1399 .proc_handler = &proc_dointvec, 1400 }, 1401 { 1402 .ctl_name = FS_STATINODE, 1403 .procname = "inode-state", 1404 .data = &inodes_stat, 1405 .maxlen = 7*sizeof(int), 1406 .mode = 0444, 1407 .proc_handler = &proc_dointvec, 1408 }, 1409 { 1410 .procname = "file-nr", 1411 .data = &files_stat, 1412 .maxlen = 3*sizeof(int), 1413 .mode = 0444, 1414 .proc_handler = &proc_nr_files, 1415 }, 1416 { 1417 .ctl_name = FS_MAXFILE, 1418 .procname = "file-max", 1419 .data = &files_stat.max_files, 1420 .maxlen = sizeof(int), 1421 .mode = 0644, 1422 .proc_handler = &proc_dointvec, 1423 }, 1424 { 1425 .ctl_name = CTL_UNNUMBERED, 1426 .procname = "nr_open", 1427 .data = &sysctl_nr_open, 1428 .maxlen = sizeof(int), 1429 .mode = 0644, 1430 .proc_handler = &proc_dointvec_minmax, 1431 .extra1 = &sysctl_nr_open_min, 1432 .extra2 = &sysctl_nr_open_max, 1433 }, 1434 { 1435 .ctl_name = FS_DENTRY, 1436 .procname = "dentry-state", 1437 .data = &dentry_stat, 1438 .maxlen = 6*sizeof(int), 1439 .mode = 0444, 1440 .proc_handler = &proc_dointvec, 1441 }, 1442 { 1443 .ctl_name = FS_OVERFLOWUID, 1444 .procname = "overflowuid", 1445 .data = &fs_overflowuid, 1446 .maxlen = sizeof(int), 1447 .mode = 0644, 1448 .proc_handler = &proc_dointvec_minmax, 1449 .strategy = &sysctl_intvec, 1450 .extra1 = &minolduid, 1451 .extra2 = &maxolduid, 1452 }, 1453 { 1454 .ctl_name = FS_OVERFLOWGID, 1455 .procname = "overflowgid", 1456 .data = &fs_overflowgid, 1457 .maxlen = sizeof(int), 1458 .mode = 0644, 1459 .proc_handler = &proc_dointvec_minmax, 1460 .strategy = &sysctl_intvec, 1461 .extra1 = &minolduid, 1462 .extra2 = &maxolduid, 1463 }, 1464 #ifdef CONFIG_FILE_LOCKING 1465 { 1466 .ctl_name = FS_LEASES, 1467 .procname = "leases-enable", 1468 .data = &leases_enable, 1469 .maxlen = sizeof(int), 1470 .mode = 0644, 1471 .proc_handler = &proc_dointvec, 1472 }, 1473 #endif 1474 #ifdef CONFIG_DNOTIFY 1475 { 1476 .ctl_name = FS_DIR_NOTIFY, 1477 .procname = "dir-notify-enable", 1478 .data = &dir_notify_enable, 1479 .maxlen = sizeof(int), 1480 .mode = 0644, 1481 .proc_handler = &proc_dointvec, 1482 }, 1483 #endif 1484 #ifdef CONFIG_MMU 1485 #ifdef CONFIG_FILE_LOCKING 1486 { 1487 .ctl_name = FS_LEASE_TIME, 1488 .procname = "lease-break-time", 1489 .data = &lease_break_time, 1490 .maxlen = sizeof(int), 1491 .mode = 0644, 1492 .proc_handler = &proc_dointvec, 1493 }, 1494 #endif 1495 #ifdef CONFIG_AIO 1496 { 1497 .procname = "aio-nr", 1498 .data = &aio_nr, 1499 .maxlen = sizeof(aio_nr), 1500 .mode = 0444, 1501 .proc_handler = &proc_doulongvec_minmax, 1502 }, 1503 { 1504 .procname = "aio-max-nr", 1505 .data = &aio_max_nr, 1506 .maxlen = sizeof(aio_max_nr), 1507 .mode = 0644, 1508 .proc_handler = &proc_doulongvec_minmax, 1509 }, 1510 #endif /* CONFIG_AIO */ 1511 #ifdef CONFIG_INOTIFY_USER 1512 { 1513 .ctl_name = FS_INOTIFY, 1514 .procname = "inotify", 1515 .mode = 0555, 1516 .child = inotify_table, 1517 }, 1518 #endif 1519 #ifdef CONFIG_EPOLL 1520 { 1521 .procname = "epoll", 1522 .mode = 0555, 1523 .child = epoll_table, 1524 }, 1525 #endif 1526 #endif 1527 { 1528 .ctl_name = KERN_SETUID_DUMPABLE, 1529 .procname = "suid_dumpable", 1530 .data = &suid_dumpable, 1531 .maxlen = sizeof(int), 1532 .mode = 0644, 1533 .proc_handler = &proc_dointvec_minmax, 1534 .strategy = &sysctl_intvec, 1535 .extra1 = &zero, 1536 .extra2 = &two, 1537 }, 1538 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1539 { 1540 .ctl_name = CTL_UNNUMBERED, 1541 .procname = "binfmt_misc", 1542 .mode = 0555, 1543 .child = binfmt_misc_table, 1544 }, 1545 #endif 1546 /* 1547 * NOTE: do not add new entries to this table unless you have read 1548 * Documentation/sysctl/ctl_unnumbered.txt 1549 */ 1550 { .ctl_name = 0 } 1551 }; 1552 1553 static struct ctl_table debug_table[] = { 1554 #if defined(CONFIG_X86) || defined(CONFIG_PPC) 1555 { 1556 .ctl_name = CTL_UNNUMBERED, 1557 .procname = "exception-trace", 1558 .data = &show_unhandled_signals, 1559 .maxlen = sizeof(int), 1560 .mode = 0644, 1561 .proc_handler = proc_dointvec 1562 }, 1563 #endif 1564 { .ctl_name = 0 } 1565 }; 1566 1567 static struct ctl_table dev_table[] = { 1568 { .ctl_name = 0 } 1569 }; 1570 1571 static DEFINE_SPINLOCK(sysctl_lock); 1572 1573 /* called under sysctl_lock */ 1574 static int use_table(struct ctl_table_header *p) 1575 { 1576 if (unlikely(p->unregistering)) 1577 return 0; 1578 p->used++; 1579 return 1; 1580 } 1581 1582 /* called under sysctl_lock */ 1583 static void unuse_table(struct ctl_table_header *p) 1584 { 1585 if (!--p->used) 1586 if (unlikely(p->unregistering)) 1587 complete(p->unregistering); 1588 } 1589 1590 /* called under sysctl_lock, will reacquire if has to wait */ 1591 static void start_unregistering(struct ctl_table_header *p) 1592 { 1593 /* 1594 * if p->used is 0, nobody will ever touch that entry again; 1595 * we'll eliminate all paths to it before dropping sysctl_lock 1596 */ 1597 if (unlikely(p->used)) { 1598 struct completion wait; 1599 init_completion(&wait); 1600 p->unregistering = &wait; 1601 spin_unlock(&sysctl_lock); 1602 wait_for_completion(&wait); 1603 spin_lock(&sysctl_lock); 1604 } else { 1605 /* anything non-NULL; we'll never dereference it */ 1606 p->unregistering = ERR_PTR(-EINVAL); 1607 } 1608 /* 1609 * do not remove from the list until nobody holds it; walking the 1610 * list in do_sysctl() relies on that. 1611 */ 1612 list_del_init(&p->ctl_entry); 1613 } 1614 1615 void sysctl_head_get(struct ctl_table_header *head) 1616 { 1617 spin_lock(&sysctl_lock); 1618 head->count++; 1619 spin_unlock(&sysctl_lock); 1620 } 1621 1622 void sysctl_head_put(struct ctl_table_header *head) 1623 { 1624 spin_lock(&sysctl_lock); 1625 if (!--head->count) 1626 kfree(head); 1627 spin_unlock(&sysctl_lock); 1628 } 1629 1630 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1631 { 1632 if (!head) 1633 BUG(); 1634 spin_lock(&sysctl_lock); 1635 if (!use_table(head)) 1636 head = ERR_PTR(-ENOENT); 1637 spin_unlock(&sysctl_lock); 1638 return head; 1639 } 1640 1641 void sysctl_head_finish(struct ctl_table_header *head) 1642 { 1643 if (!head) 1644 return; 1645 spin_lock(&sysctl_lock); 1646 unuse_table(head); 1647 spin_unlock(&sysctl_lock); 1648 } 1649 1650 static struct ctl_table_set * 1651 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1652 { 1653 struct ctl_table_set *set = &root->default_set; 1654 if (root->lookup) 1655 set = root->lookup(root, namespaces); 1656 return set; 1657 } 1658 1659 static struct list_head * 1660 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1661 { 1662 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1663 return &set->list; 1664 } 1665 1666 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1667 struct ctl_table_header *prev) 1668 { 1669 struct ctl_table_root *root; 1670 struct list_head *header_list; 1671 struct ctl_table_header *head; 1672 struct list_head *tmp; 1673 1674 spin_lock(&sysctl_lock); 1675 if (prev) { 1676 head = prev; 1677 tmp = &prev->ctl_entry; 1678 unuse_table(prev); 1679 goto next; 1680 } 1681 tmp = &root_table_header.ctl_entry; 1682 for (;;) { 1683 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1684 1685 if (!use_table(head)) 1686 goto next; 1687 spin_unlock(&sysctl_lock); 1688 return head; 1689 next: 1690 root = head->root; 1691 tmp = tmp->next; 1692 header_list = lookup_header_list(root, namespaces); 1693 if (tmp != header_list) 1694 continue; 1695 1696 do { 1697 root = list_entry(root->root_list.next, 1698 struct ctl_table_root, root_list); 1699 if (root == &sysctl_table_root) 1700 goto out; 1701 header_list = lookup_header_list(root, namespaces); 1702 } while (list_empty(header_list)); 1703 tmp = header_list->next; 1704 } 1705 out: 1706 spin_unlock(&sysctl_lock); 1707 return NULL; 1708 } 1709 1710 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1711 { 1712 return __sysctl_head_next(current->nsproxy, prev); 1713 } 1714 1715 void register_sysctl_root(struct ctl_table_root *root) 1716 { 1717 spin_lock(&sysctl_lock); 1718 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1719 spin_unlock(&sysctl_lock); 1720 } 1721 1722 #ifdef CONFIG_SYSCTL_SYSCALL 1723 /* Perform the actual read/write of a sysctl table entry. */ 1724 static int do_sysctl_strategy(struct ctl_table_root *root, 1725 struct ctl_table *table, 1726 void __user *oldval, size_t __user *oldlenp, 1727 void __user *newval, size_t newlen) 1728 { 1729 int op = 0, rc; 1730 1731 if (oldval) 1732 op |= MAY_READ; 1733 if (newval) 1734 op |= MAY_WRITE; 1735 if (sysctl_perm(root, table, op)) 1736 return -EPERM; 1737 1738 if (table->strategy) { 1739 rc = table->strategy(table, oldval, oldlenp, newval, newlen); 1740 if (rc < 0) 1741 return rc; 1742 if (rc > 0) 1743 return 0; 1744 } 1745 1746 /* If there is no strategy routine, or if the strategy returns 1747 * zero, proceed with automatic r/w */ 1748 if (table->data && table->maxlen) { 1749 rc = sysctl_data(table, oldval, oldlenp, newval, newlen); 1750 if (rc < 0) 1751 return rc; 1752 } 1753 return 0; 1754 } 1755 1756 static int parse_table(int __user *name, int nlen, 1757 void __user *oldval, size_t __user *oldlenp, 1758 void __user *newval, size_t newlen, 1759 struct ctl_table_root *root, 1760 struct ctl_table *table) 1761 { 1762 int n; 1763 repeat: 1764 if (!nlen) 1765 return -ENOTDIR; 1766 if (get_user(n, name)) 1767 return -EFAULT; 1768 for ( ; table->ctl_name || table->procname; table++) { 1769 if (!table->ctl_name) 1770 continue; 1771 if (n == table->ctl_name) { 1772 int error; 1773 if (table->child) { 1774 if (sysctl_perm(root, table, MAY_EXEC)) 1775 return -EPERM; 1776 name++; 1777 nlen--; 1778 table = table->child; 1779 goto repeat; 1780 } 1781 error = do_sysctl_strategy(root, table, 1782 oldval, oldlenp, 1783 newval, newlen); 1784 return error; 1785 } 1786 } 1787 return -ENOTDIR; 1788 } 1789 1790 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1791 void __user *newval, size_t newlen) 1792 { 1793 struct ctl_table_header *head; 1794 int error = -ENOTDIR; 1795 1796 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1797 return -ENOTDIR; 1798 if (oldval) { 1799 int old_len; 1800 if (!oldlenp || get_user(old_len, oldlenp)) 1801 return -EFAULT; 1802 } 1803 1804 for (head = sysctl_head_next(NULL); head; 1805 head = sysctl_head_next(head)) { 1806 error = parse_table(name, nlen, oldval, oldlenp, 1807 newval, newlen, 1808 head->root, head->ctl_table); 1809 if (error != -ENOTDIR) { 1810 sysctl_head_finish(head); 1811 break; 1812 } 1813 } 1814 return error; 1815 } 1816 1817 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 1818 { 1819 struct __sysctl_args tmp; 1820 int error; 1821 1822 if (copy_from_user(&tmp, args, sizeof(tmp))) 1823 return -EFAULT; 1824 1825 error = deprecated_sysctl_warning(&tmp); 1826 if (error) 1827 goto out; 1828 1829 lock_kernel(); 1830 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1831 tmp.newval, tmp.newlen); 1832 unlock_kernel(); 1833 out: 1834 return error; 1835 } 1836 #endif /* CONFIG_SYSCTL_SYSCALL */ 1837 1838 /* 1839 * sysctl_perm does NOT grant the superuser all rights automatically, because 1840 * some sysctl variables are readonly even to root. 1841 */ 1842 1843 static int test_perm(int mode, int op) 1844 { 1845 if (!current_euid()) 1846 mode >>= 6; 1847 else if (in_egroup_p(0)) 1848 mode >>= 3; 1849 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1850 return 0; 1851 return -EACCES; 1852 } 1853 1854 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1855 { 1856 int error; 1857 int mode; 1858 1859 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1860 if (error) 1861 return error; 1862 1863 if (root->permissions) 1864 mode = root->permissions(root, current->nsproxy, table); 1865 else 1866 mode = table->mode; 1867 1868 return test_perm(mode, op); 1869 } 1870 1871 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1872 { 1873 for (; table->ctl_name || table->procname; table++) { 1874 table->parent = parent; 1875 if (table->child) 1876 sysctl_set_parent(table, table->child); 1877 } 1878 } 1879 1880 static __init int sysctl_init(void) 1881 { 1882 sysctl_set_parent(NULL, root_table); 1883 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1884 { 1885 int err; 1886 err = sysctl_check_table(current->nsproxy, root_table); 1887 } 1888 #endif 1889 return 0; 1890 } 1891 1892 core_initcall(sysctl_init); 1893 1894 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1895 struct ctl_table *table) 1896 { 1897 struct ctl_table *p; 1898 const char *s = branch->procname; 1899 1900 /* branch should have named subdirectory as its first element */ 1901 if (!s || !branch->child) 1902 return NULL; 1903 1904 /* ... and nothing else */ 1905 if (branch[1].procname || branch[1].ctl_name) 1906 return NULL; 1907 1908 /* table should contain subdirectory with the same name */ 1909 for (p = table; p->procname || p->ctl_name; p++) { 1910 if (!p->child) 1911 continue; 1912 if (p->procname && strcmp(p->procname, s) == 0) 1913 return p; 1914 } 1915 return NULL; 1916 } 1917 1918 /* see if attaching q to p would be an improvement */ 1919 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1920 { 1921 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1922 struct ctl_table *next; 1923 int is_better = 0; 1924 int not_in_parent = !p->attached_by; 1925 1926 while ((next = is_branch_in(by, to)) != NULL) { 1927 if (by == q->attached_by) 1928 is_better = 1; 1929 if (to == p->attached_by) 1930 not_in_parent = 1; 1931 by = by->child; 1932 to = next->child; 1933 } 1934 1935 if (is_better && not_in_parent) { 1936 q->attached_by = by; 1937 q->attached_to = to; 1938 q->parent = p; 1939 } 1940 } 1941 1942 /** 1943 * __register_sysctl_paths - register a sysctl hierarchy 1944 * @root: List of sysctl headers to register on 1945 * @namespaces: Data to compute which lists of sysctl entries are visible 1946 * @path: The path to the directory the sysctl table is in. 1947 * @table: the top-level table structure 1948 * 1949 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1950 * array. A completely 0 filled entry terminates the table. 1951 * 1952 * The members of the &struct ctl_table structure are used as follows: 1953 * 1954 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1955 * must be unique within that level of sysctl 1956 * 1957 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1958 * enter a sysctl file 1959 * 1960 * data - a pointer to data for use by proc_handler 1961 * 1962 * maxlen - the maximum size in bytes of the data 1963 * 1964 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1965 * 1966 * child - a pointer to the child sysctl table if this entry is a directory, or 1967 * %NULL. 1968 * 1969 * proc_handler - the text handler routine (described below) 1970 * 1971 * strategy - the strategy routine (described below) 1972 * 1973 * de - for internal use by the sysctl routines 1974 * 1975 * extra1, extra2 - extra pointers usable by the proc handler routines 1976 * 1977 * Leaf nodes in the sysctl tree will be represented by a single file 1978 * under /proc; non-leaf nodes will be represented by directories. 1979 * 1980 * sysctl(2) can automatically manage read and write requests through 1981 * the sysctl table. The data and maxlen fields of the ctl_table 1982 * struct enable minimal validation of the values being written to be 1983 * performed, and the mode field allows minimal authentication. 1984 * 1985 * More sophisticated management can be enabled by the provision of a 1986 * strategy routine with the table entry. This will be called before 1987 * any automatic read or write of the data is performed. 1988 * 1989 * The strategy routine may return 1990 * 1991 * < 0 - Error occurred (error is passed to user process) 1992 * 1993 * 0 - OK - proceed with automatic read or write. 1994 * 1995 * > 0 - OK - read or write has been done by the strategy routine, so 1996 * return immediately. 1997 * 1998 * There must be a proc_handler routine for any terminal nodes 1999 * mirrored under /proc/sys (non-terminals are handled by a built-in 2000 * directory handler). Several default handlers are available to 2001 * cover common cases - 2002 * 2003 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 2004 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 2005 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 2006 * 2007 * It is the handler's job to read the input buffer from user memory 2008 * and process it. The handler should return 0 on success. 2009 * 2010 * This routine returns %NULL on a failure to register, and a pointer 2011 * to the table header on success. 2012 */ 2013 struct ctl_table_header *__register_sysctl_paths( 2014 struct ctl_table_root *root, 2015 struct nsproxy *namespaces, 2016 const struct ctl_path *path, struct ctl_table *table) 2017 { 2018 struct ctl_table_header *header; 2019 struct ctl_table *new, **prevp; 2020 unsigned int n, npath; 2021 struct ctl_table_set *set; 2022 2023 /* Count the path components */ 2024 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) 2025 ; 2026 2027 /* 2028 * For each path component, allocate a 2-element ctl_table array. 2029 * The first array element will be filled with the sysctl entry 2030 * for this, the second will be the sentinel (ctl_name == 0). 2031 * 2032 * We allocate everything in one go so that we don't have to 2033 * worry about freeing additional memory in unregister_sysctl_table. 2034 */ 2035 header = kzalloc(sizeof(struct ctl_table_header) + 2036 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 2037 if (!header) 2038 return NULL; 2039 2040 new = (struct ctl_table *) (header + 1); 2041 2042 /* Now connect the dots */ 2043 prevp = &header->ctl_table; 2044 for (n = 0; n < npath; ++n, ++path) { 2045 /* Copy the procname */ 2046 new->procname = path->procname; 2047 new->ctl_name = path->ctl_name; 2048 new->mode = 0555; 2049 2050 *prevp = new; 2051 prevp = &new->child; 2052 2053 new += 2; 2054 } 2055 *prevp = table; 2056 header->ctl_table_arg = table; 2057 2058 INIT_LIST_HEAD(&header->ctl_entry); 2059 header->used = 0; 2060 header->unregistering = NULL; 2061 header->root = root; 2062 sysctl_set_parent(NULL, header->ctl_table); 2063 header->count = 1; 2064 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 2065 if (sysctl_check_table(namespaces, header->ctl_table)) { 2066 kfree(header); 2067 return NULL; 2068 } 2069 #endif 2070 spin_lock(&sysctl_lock); 2071 header->set = lookup_header_set(root, namespaces); 2072 header->attached_by = header->ctl_table; 2073 header->attached_to = root_table; 2074 header->parent = &root_table_header; 2075 for (set = header->set; set; set = set->parent) { 2076 struct ctl_table_header *p; 2077 list_for_each_entry(p, &set->list, ctl_entry) { 2078 if (p->unregistering) 2079 continue; 2080 try_attach(p, header); 2081 } 2082 } 2083 header->parent->count++; 2084 list_add_tail(&header->ctl_entry, &header->set->list); 2085 spin_unlock(&sysctl_lock); 2086 2087 return header; 2088 } 2089 2090 /** 2091 * register_sysctl_table_path - register a sysctl table hierarchy 2092 * @path: The path to the directory the sysctl table is in. 2093 * @table: the top-level table structure 2094 * 2095 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 2096 * array. A completely 0 filled entry terminates the table. 2097 * 2098 * See __register_sysctl_paths for more details. 2099 */ 2100 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2101 struct ctl_table *table) 2102 { 2103 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 2104 path, table); 2105 } 2106 2107 /** 2108 * register_sysctl_table - register a sysctl table hierarchy 2109 * @table: the top-level table structure 2110 * 2111 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 2112 * array. A completely 0 filled entry terminates the table. 2113 * 2114 * See register_sysctl_paths for more details. 2115 */ 2116 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 2117 { 2118 static const struct ctl_path null_path[] = { {} }; 2119 2120 return register_sysctl_paths(null_path, table); 2121 } 2122 2123 /** 2124 * unregister_sysctl_table - unregister a sysctl table hierarchy 2125 * @header: the header returned from register_sysctl_table 2126 * 2127 * Unregisters the sysctl table and all children. proc entries may not 2128 * actually be removed until they are no longer used by anyone. 2129 */ 2130 void unregister_sysctl_table(struct ctl_table_header * header) 2131 { 2132 might_sleep(); 2133 2134 if (header == NULL) 2135 return; 2136 2137 spin_lock(&sysctl_lock); 2138 start_unregistering(header); 2139 if (!--header->parent->count) { 2140 WARN_ON(1); 2141 kfree(header->parent); 2142 } 2143 if (!--header->count) 2144 kfree(header); 2145 spin_unlock(&sysctl_lock); 2146 } 2147 2148 int sysctl_is_seen(struct ctl_table_header *p) 2149 { 2150 struct ctl_table_set *set = p->set; 2151 int res; 2152 spin_lock(&sysctl_lock); 2153 if (p->unregistering) 2154 res = 0; 2155 else if (!set->is_seen) 2156 res = 1; 2157 else 2158 res = set->is_seen(set); 2159 spin_unlock(&sysctl_lock); 2160 return res; 2161 } 2162 2163 void setup_sysctl_set(struct ctl_table_set *p, 2164 struct ctl_table_set *parent, 2165 int (*is_seen)(struct ctl_table_set *)) 2166 { 2167 INIT_LIST_HEAD(&p->list); 2168 p->parent = parent ? parent : &sysctl_table_root.default_set; 2169 p->is_seen = is_seen; 2170 } 2171 2172 #else /* !CONFIG_SYSCTL */ 2173 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2174 { 2175 return NULL; 2176 } 2177 2178 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2179 struct ctl_table *table) 2180 { 2181 return NULL; 2182 } 2183 2184 void unregister_sysctl_table(struct ctl_table_header * table) 2185 { 2186 } 2187 2188 void setup_sysctl_set(struct ctl_table_set *p, 2189 struct ctl_table_set *parent, 2190 int (*is_seen)(struct ctl_table_set *)) 2191 { 2192 } 2193 2194 void sysctl_head_put(struct ctl_table_header *head) 2195 { 2196 } 2197 2198 #endif /* CONFIG_SYSCTL */ 2199 2200 /* 2201 * /proc/sys support 2202 */ 2203 2204 #ifdef CONFIG_PROC_SYSCTL 2205 2206 static int _proc_do_string(void* data, int maxlen, int write, 2207 struct file *filp, void __user *buffer, 2208 size_t *lenp, loff_t *ppos) 2209 { 2210 size_t len; 2211 char __user *p; 2212 char c; 2213 2214 if (!data || !maxlen || !*lenp) { 2215 *lenp = 0; 2216 return 0; 2217 } 2218 2219 if (write) { 2220 len = 0; 2221 p = buffer; 2222 while (len < *lenp) { 2223 if (get_user(c, p++)) 2224 return -EFAULT; 2225 if (c == 0 || c == '\n') 2226 break; 2227 len++; 2228 } 2229 if (len >= maxlen) 2230 len = maxlen-1; 2231 if(copy_from_user(data, buffer, len)) 2232 return -EFAULT; 2233 ((char *) data)[len] = 0; 2234 *ppos += *lenp; 2235 } else { 2236 len = strlen(data); 2237 if (len > maxlen) 2238 len = maxlen; 2239 2240 if (*ppos > len) { 2241 *lenp = 0; 2242 return 0; 2243 } 2244 2245 data += *ppos; 2246 len -= *ppos; 2247 2248 if (len > *lenp) 2249 len = *lenp; 2250 if (len) 2251 if(copy_to_user(buffer, data, len)) 2252 return -EFAULT; 2253 if (len < *lenp) { 2254 if(put_user('\n', ((char __user *) buffer) + len)) 2255 return -EFAULT; 2256 len++; 2257 } 2258 *lenp = len; 2259 *ppos += len; 2260 } 2261 return 0; 2262 } 2263 2264 /** 2265 * proc_dostring - read a string sysctl 2266 * @table: the sysctl table 2267 * @write: %TRUE if this is a write to the sysctl file 2268 * @filp: the file structure 2269 * @buffer: the user buffer 2270 * @lenp: the size of the user buffer 2271 * @ppos: file position 2272 * 2273 * Reads/writes a string from/to the user buffer. If the kernel 2274 * buffer provided is not large enough to hold the string, the 2275 * string is truncated. The copied string is %NULL-terminated. 2276 * If the string is being read by the user process, it is copied 2277 * and a newline '\n' is added. It is truncated if the buffer is 2278 * not large enough. 2279 * 2280 * Returns 0 on success. 2281 */ 2282 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2283 void __user *buffer, size_t *lenp, loff_t *ppos) 2284 { 2285 return _proc_do_string(table->data, table->maxlen, write, filp, 2286 buffer, lenp, ppos); 2287 } 2288 2289 2290 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 2291 int *valp, 2292 int write, void *data) 2293 { 2294 if (write) { 2295 *valp = *negp ? -*lvalp : *lvalp; 2296 } else { 2297 int val = *valp; 2298 if (val < 0) { 2299 *negp = -1; 2300 *lvalp = (unsigned long)-val; 2301 } else { 2302 *negp = 0; 2303 *lvalp = (unsigned long)val; 2304 } 2305 } 2306 return 0; 2307 } 2308 2309 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2310 int write, struct file *filp, void __user *buffer, 2311 size_t *lenp, loff_t *ppos, 2312 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2313 int write, void *data), 2314 void *data) 2315 { 2316 #define TMPBUFLEN 21 2317 int *i, vleft, first = 1, neg; 2318 unsigned long lval; 2319 size_t left, len; 2320 2321 char buf[TMPBUFLEN], *p; 2322 char __user *s = buffer; 2323 2324 if (!tbl_data || !table->maxlen || !*lenp || 2325 (*ppos && !write)) { 2326 *lenp = 0; 2327 return 0; 2328 } 2329 2330 i = (int *) tbl_data; 2331 vleft = table->maxlen / sizeof(*i); 2332 left = *lenp; 2333 2334 if (!conv) 2335 conv = do_proc_dointvec_conv; 2336 2337 for (; left && vleft--; i++, first=0) { 2338 if (write) { 2339 while (left) { 2340 char c; 2341 if (get_user(c, s)) 2342 return -EFAULT; 2343 if (!isspace(c)) 2344 break; 2345 left--; 2346 s++; 2347 } 2348 if (!left) 2349 break; 2350 neg = 0; 2351 len = left; 2352 if (len > sizeof(buf) - 1) 2353 len = sizeof(buf) - 1; 2354 if (copy_from_user(buf, s, len)) 2355 return -EFAULT; 2356 buf[len] = 0; 2357 p = buf; 2358 if (*p == '-' && left > 1) { 2359 neg = 1; 2360 p++; 2361 } 2362 if (*p < '0' || *p > '9') 2363 break; 2364 2365 lval = simple_strtoul(p, &p, 0); 2366 2367 len = p-buf; 2368 if ((len < left) && *p && !isspace(*p)) 2369 break; 2370 s += len; 2371 left -= len; 2372 2373 if (conv(&neg, &lval, i, 1, data)) 2374 break; 2375 } else { 2376 p = buf; 2377 if (!first) 2378 *p++ = '\t'; 2379 2380 if (conv(&neg, &lval, i, 0, data)) 2381 break; 2382 2383 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2384 len = strlen(buf); 2385 if (len > left) 2386 len = left; 2387 if(copy_to_user(s, buf, len)) 2388 return -EFAULT; 2389 left -= len; 2390 s += len; 2391 } 2392 } 2393 2394 if (!write && !first && left) { 2395 if(put_user('\n', s)) 2396 return -EFAULT; 2397 left--, s++; 2398 } 2399 if (write) { 2400 while (left) { 2401 char c; 2402 if (get_user(c, s++)) 2403 return -EFAULT; 2404 if (!isspace(c)) 2405 break; 2406 left--; 2407 } 2408 } 2409 if (write && first) 2410 return -EINVAL; 2411 *lenp -= left; 2412 *ppos += *lenp; 2413 return 0; 2414 #undef TMPBUFLEN 2415 } 2416 2417 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2418 void __user *buffer, size_t *lenp, loff_t *ppos, 2419 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2420 int write, void *data), 2421 void *data) 2422 { 2423 return __do_proc_dointvec(table->data, table, write, filp, 2424 buffer, lenp, ppos, conv, data); 2425 } 2426 2427 /** 2428 * proc_dointvec - read a vector of integers 2429 * @table: the sysctl table 2430 * @write: %TRUE if this is a write to the sysctl file 2431 * @filp: the file structure 2432 * @buffer: the user buffer 2433 * @lenp: the size of the user buffer 2434 * @ppos: file position 2435 * 2436 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2437 * values from/to the user buffer, treated as an ASCII string. 2438 * 2439 * Returns 0 on success. 2440 */ 2441 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2442 void __user *buffer, size_t *lenp, loff_t *ppos) 2443 { 2444 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2445 NULL,NULL); 2446 } 2447 2448 /* 2449 * Taint values can only be increased 2450 * This means we can safely use a temporary. 2451 */ 2452 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 2453 void __user *buffer, size_t *lenp, loff_t *ppos) 2454 { 2455 struct ctl_table t; 2456 unsigned long tmptaint = get_taint(); 2457 int err; 2458 2459 if (write && !capable(CAP_SYS_ADMIN)) 2460 return -EPERM; 2461 2462 t = *table; 2463 t.data = &tmptaint; 2464 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos); 2465 if (err < 0) 2466 return err; 2467 2468 if (write) { 2469 /* 2470 * Poor man's atomic or. Not worth adding a primitive 2471 * to everyone's atomic.h for this 2472 */ 2473 int i; 2474 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2475 if ((tmptaint >> i) & 1) 2476 add_taint(i); 2477 } 2478 } 2479 2480 return err; 2481 } 2482 2483 struct do_proc_dointvec_minmax_conv_param { 2484 int *min; 2485 int *max; 2486 }; 2487 2488 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2489 int *valp, 2490 int write, void *data) 2491 { 2492 struct do_proc_dointvec_minmax_conv_param *param = data; 2493 if (write) { 2494 int val = *negp ? -*lvalp : *lvalp; 2495 if ((param->min && *param->min > val) || 2496 (param->max && *param->max < val)) 2497 return -EINVAL; 2498 *valp = val; 2499 } else { 2500 int val = *valp; 2501 if (val < 0) { 2502 *negp = -1; 2503 *lvalp = (unsigned long)-val; 2504 } else { 2505 *negp = 0; 2506 *lvalp = (unsigned long)val; 2507 } 2508 } 2509 return 0; 2510 } 2511 2512 /** 2513 * proc_dointvec_minmax - read a vector of integers with min/max values 2514 * @table: the sysctl table 2515 * @write: %TRUE if this is a write to the sysctl file 2516 * @filp: the file structure 2517 * @buffer: the user buffer 2518 * @lenp: the size of the user buffer 2519 * @ppos: file position 2520 * 2521 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2522 * values from/to the user buffer, treated as an ASCII string. 2523 * 2524 * This routine will ensure the values are within the range specified by 2525 * table->extra1 (min) and table->extra2 (max). 2526 * 2527 * Returns 0 on success. 2528 */ 2529 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2530 void __user *buffer, size_t *lenp, loff_t *ppos) 2531 { 2532 struct do_proc_dointvec_minmax_conv_param param = { 2533 .min = (int *) table->extra1, 2534 .max = (int *) table->extra2, 2535 }; 2536 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2537 do_proc_dointvec_minmax_conv, ¶m); 2538 } 2539 2540 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2541 struct file *filp, 2542 void __user *buffer, 2543 size_t *lenp, loff_t *ppos, 2544 unsigned long convmul, 2545 unsigned long convdiv) 2546 { 2547 #define TMPBUFLEN 21 2548 unsigned long *i, *min, *max, val; 2549 int vleft, first=1, neg; 2550 size_t len, left; 2551 char buf[TMPBUFLEN], *p; 2552 char __user *s = buffer; 2553 2554 if (!data || !table->maxlen || !*lenp || 2555 (*ppos && !write)) { 2556 *lenp = 0; 2557 return 0; 2558 } 2559 2560 i = (unsigned long *) data; 2561 min = (unsigned long *) table->extra1; 2562 max = (unsigned long *) table->extra2; 2563 vleft = table->maxlen / sizeof(unsigned long); 2564 left = *lenp; 2565 2566 for (; left && vleft--; i++, min++, max++, first=0) { 2567 if (write) { 2568 while (left) { 2569 char c; 2570 if (get_user(c, s)) 2571 return -EFAULT; 2572 if (!isspace(c)) 2573 break; 2574 left--; 2575 s++; 2576 } 2577 if (!left) 2578 break; 2579 neg = 0; 2580 len = left; 2581 if (len > TMPBUFLEN-1) 2582 len = TMPBUFLEN-1; 2583 if (copy_from_user(buf, s, len)) 2584 return -EFAULT; 2585 buf[len] = 0; 2586 p = buf; 2587 if (*p == '-' && left > 1) { 2588 neg = 1; 2589 p++; 2590 } 2591 if (*p < '0' || *p > '9') 2592 break; 2593 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2594 len = p-buf; 2595 if ((len < left) && *p && !isspace(*p)) 2596 break; 2597 if (neg) 2598 val = -val; 2599 s += len; 2600 left -= len; 2601 2602 if(neg) 2603 continue; 2604 if ((min && val < *min) || (max && val > *max)) 2605 continue; 2606 *i = val; 2607 } else { 2608 p = buf; 2609 if (!first) 2610 *p++ = '\t'; 2611 sprintf(p, "%lu", convdiv * (*i) / convmul); 2612 len = strlen(buf); 2613 if (len > left) 2614 len = left; 2615 if(copy_to_user(s, buf, len)) 2616 return -EFAULT; 2617 left -= len; 2618 s += len; 2619 } 2620 } 2621 2622 if (!write && !first && left) { 2623 if(put_user('\n', s)) 2624 return -EFAULT; 2625 left--, s++; 2626 } 2627 if (write) { 2628 while (left) { 2629 char c; 2630 if (get_user(c, s++)) 2631 return -EFAULT; 2632 if (!isspace(c)) 2633 break; 2634 left--; 2635 } 2636 } 2637 if (write && first) 2638 return -EINVAL; 2639 *lenp -= left; 2640 *ppos += *lenp; 2641 return 0; 2642 #undef TMPBUFLEN 2643 } 2644 2645 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2646 struct file *filp, 2647 void __user *buffer, 2648 size_t *lenp, loff_t *ppos, 2649 unsigned long convmul, 2650 unsigned long convdiv) 2651 { 2652 return __do_proc_doulongvec_minmax(table->data, table, write, 2653 filp, buffer, lenp, ppos, convmul, convdiv); 2654 } 2655 2656 /** 2657 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2658 * @table: the sysctl table 2659 * @write: %TRUE if this is a write to the sysctl file 2660 * @filp: the file structure 2661 * @buffer: the user buffer 2662 * @lenp: the size of the user buffer 2663 * @ppos: file position 2664 * 2665 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2666 * values from/to the user buffer, treated as an ASCII string. 2667 * 2668 * This routine will ensure the values are within the range specified by 2669 * table->extra1 (min) and table->extra2 (max). 2670 * 2671 * Returns 0 on success. 2672 */ 2673 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2674 void __user *buffer, size_t *lenp, loff_t *ppos) 2675 { 2676 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2677 } 2678 2679 /** 2680 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2681 * @table: the sysctl table 2682 * @write: %TRUE if this is a write to the sysctl file 2683 * @filp: the file structure 2684 * @buffer: the user buffer 2685 * @lenp: the size of the user buffer 2686 * @ppos: file position 2687 * 2688 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2689 * values from/to the user buffer, treated as an ASCII string. The values 2690 * are treated as milliseconds, and converted to jiffies when they are stored. 2691 * 2692 * This routine will ensure the values are within the range specified by 2693 * table->extra1 (min) and table->extra2 (max). 2694 * 2695 * Returns 0 on success. 2696 */ 2697 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2698 struct file *filp, 2699 void __user *buffer, 2700 size_t *lenp, loff_t *ppos) 2701 { 2702 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2703 lenp, ppos, HZ, 1000l); 2704 } 2705 2706 2707 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2708 int *valp, 2709 int write, void *data) 2710 { 2711 if (write) { 2712 if (*lvalp > LONG_MAX / HZ) 2713 return 1; 2714 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2715 } else { 2716 int val = *valp; 2717 unsigned long lval; 2718 if (val < 0) { 2719 *negp = -1; 2720 lval = (unsigned long)-val; 2721 } else { 2722 *negp = 0; 2723 lval = (unsigned long)val; 2724 } 2725 *lvalp = lval / HZ; 2726 } 2727 return 0; 2728 } 2729 2730 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2731 int *valp, 2732 int write, void *data) 2733 { 2734 if (write) { 2735 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2736 return 1; 2737 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2738 } else { 2739 int val = *valp; 2740 unsigned long lval; 2741 if (val < 0) { 2742 *negp = -1; 2743 lval = (unsigned long)-val; 2744 } else { 2745 *negp = 0; 2746 lval = (unsigned long)val; 2747 } 2748 *lvalp = jiffies_to_clock_t(lval); 2749 } 2750 return 0; 2751 } 2752 2753 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2754 int *valp, 2755 int write, void *data) 2756 { 2757 if (write) { 2758 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2759 } else { 2760 int val = *valp; 2761 unsigned long lval; 2762 if (val < 0) { 2763 *negp = -1; 2764 lval = (unsigned long)-val; 2765 } else { 2766 *negp = 0; 2767 lval = (unsigned long)val; 2768 } 2769 *lvalp = jiffies_to_msecs(lval); 2770 } 2771 return 0; 2772 } 2773 2774 /** 2775 * proc_dointvec_jiffies - read a vector of integers as seconds 2776 * @table: the sysctl table 2777 * @write: %TRUE if this is a write to the sysctl file 2778 * @filp: the file structure 2779 * @buffer: the user buffer 2780 * @lenp: the size of the user buffer 2781 * @ppos: file position 2782 * 2783 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2784 * values from/to the user buffer, treated as an ASCII string. 2785 * The values read are assumed to be in seconds, and are converted into 2786 * jiffies. 2787 * 2788 * Returns 0 on success. 2789 */ 2790 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2791 void __user *buffer, size_t *lenp, loff_t *ppos) 2792 { 2793 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2794 do_proc_dointvec_jiffies_conv,NULL); 2795 } 2796 2797 /** 2798 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2799 * @table: the sysctl table 2800 * @write: %TRUE if this is a write to the sysctl file 2801 * @filp: the file structure 2802 * @buffer: the user buffer 2803 * @lenp: the size of the user buffer 2804 * @ppos: pointer to the file position 2805 * 2806 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2807 * values from/to the user buffer, treated as an ASCII string. 2808 * The values read are assumed to be in 1/USER_HZ seconds, and 2809 * are converted into jiffies. 2810 * 2811 * Returns 0 on success. 2812 */ 2813 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2814 void __user *buffer, size_t *lenp, loff_t *ppos) 2815 { 2816 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2817 do_proc_dointvec_userhz_jiffies_conv,NULL); 2818 } 2819 2820 /** 2821 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2822 * @table: the sysctl table 2823 * @write: %TRUE if this is a write to the sysctl file 2824 * @filp: the file structure 2825 * @buffer: the user buffer 2826 * @lenp: the size of the user buffer 2827 * @ppos: file position 2828 * @ppos: the current position in the file 2829 * 2830 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2831 * values from/to the user buffer, treated as an ASCII string. 2832 * The values read are assumed to be in 1/1000 seconds, and 2833 * are converted into jiffies. 2834 * 2835 * Returns 0 on success. 2836 */ 2837 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2838 void __user *buffer, size_t *lenp, loff_t *ppos) 2839 { 2840 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2841 do_proc_dointvec_ms_jiffies_conv, NULL); 2842 } 2843 2844 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 2845 void __user *buffer, size_t *lenp, loff_t *ppos) 2846 { 2847 struct pid *new_pid; 2848 pid_t tmp; 2849 int r; 2850 2851 tmp = pid_vnr(cad_pid); 2852 2853 r = __do_proc_dointvec(&tmp, table, write, filp, buffer, 2854 lenp, ppos, NULL, NULL); 2855 if (r || !write) 2856 return r; 2857 2858 new_pid = find_get_pid(tmp); 2859 if (!new_pid) 2860 return -ESRCH; 2861 2862 put_pid(xchg(&cad_pid, new_pid)); 2863 return 0; 2864 } 2865 2866 #else /* CONFIG_PROC_FS */ 2867 2868 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2869 void __user *buffer, size_t *lenp, loff_t *ppos) 2870 { 2871 return -ENOSYS; 2872 } 2873 2874 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2875 void __user *buffer, size_t *lenp, loff_t *ppos) 2876 { 2877 return -ENOSYS; 2878 } 2879 2880 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2881 void __user *buffer, size_t *lenp, loff_t *ppos) 2882 { 2883 return -ENOSYS; 2884 } 2885 2886 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2887 void __user *buffer, size_t *lenp, loff_t *ppos) 2888 { 2889 return -ENOSYS; 2890 } 2891 2892 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2893 void __user *buffer, size_t *lenp, loff_t *ppos) 2894 { 2895 return -ENOSYS; 2896 } 2897 2898 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2899 void __user *buffer, size_t *lenp, loff_t *ppos) 2900 { 2901 return -ENOSYS; 2902 } 2903 2904 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2905 void __user *buffer, size_t *lenp, loff_t *ppos) 2906 { 2907 return -ENOSYS; 2908 } 2909 2910 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2911 struct file *filp, 2912 void __user *buffer, 2913 size_t *lenp, loff_t *ppos) 2914 { 2915 return -ENOSYS; 2916 } 2917 2918 2919 #endif /* CONFIG_PROC_FS */ 2920 2921 2922 #ifdef CONFIG_SYSCTL_SYSCALL 2923 /* 2924 * General sysctl support routines 2925 */ 2926 2927 /* The generic sysctl data routine (used if no strategy routine supplied) */ 2928 int sysctl_data(struct ctl_table *table, 2929 void __user *oldval, size_t __user *oldlenp, 2930 void __user *newval, size_t newlen) 2931 { 2932 size_t len; 2933 2934 /* Get out of I don't have a variable */ 2935 if (!table->data || !table->maxlen) 2936 return -ENOTDIR; 2937 2938 if (oldval && oldlenp) { 2939 if (get_user(len, oldlenp)) 2940 return -EFAULT; 2941 if (len) { 2942 if (len > table->maxlen) 2943 len = table->maxlen; 2944 if (copy_to_user(oldval, table->data, len)) 2945 return -EFAULT; 2946 if (put_user(len, oldlenp)) 2947 return -EFAULT; 2948 } 2949 } 2950 2951 if (newval && newlen) { 2952 if (newlen > table->maxlen) 2953 newlen = table->maxlen; 2954 2955 if (copy_from_user(table->data, newval, newlen)) 2956 return -EFAULT; 2957 } 2958 return 1; 2959 } 2960 2961 /* The generic string strategy routine: */ 2962 int sysctl_string(struct ctl_table *table, 2963 void __user *oldval, size_t __user *oldlenp, 2964 void __user *newval, size_t newlen) 2965 { 2966 if (!table->data || !table->maxlen) 2967 return -ENOTDIR; 2968 2969 if (oldval && oldlenp) { 2970 size_t bufsize; 2971 if (get_user(bufsize, oldlenp)) 2972 return -EFAULT; 2973 if (bufsize) { 2974 size_t len = strlen(table->data), copied; 2975 2976 /* This shouldn't trigger for a well-formed sysctl */ 2977 if (len > table->maxlen) 2978 len = table->maxlen; 2979 2980 /* Copy up to a max of bufsize-1 bytes of the string */ 2981 copied = (len >= bufsize) ? bufsize - 1 : len; 2982 2983 if (copy_to_user(oldval, table->data, copied) || 2984 put_user(0, (char __user *)(oldval + copied))) 2985 return -EFAULT; 2986 if (put_user(len, oldlenp)) 2987 return -EFAULT; 2988 } 2989 } 2990 if (newval && newlen) { 2991 size_t len = newlen; 2992 if (len > table->maxlen) 2993 len = table->maxlen; 2994 if(copy_from_user(table->data, newval, len)) 2995 return -EFAULT; 2996 if (len == table->maxlen) 2997 len--; 2998 ((char *) table->data)[len] = 0; 2999 } 3000 return 1; 3001 } 3002 3003 /* 3004 * This function makes sure that all of the integers in the vector 3005 * are between the minimum and maximum values given in the arrays 3006 * table->extra1 and table->extra2, respectively. 3007 */ 3008 int sysctl_intvec(struct ctl_table *table, 3009 void __user *oldval, size_t __user *oldlenp, 3010 void __user *newval, size_t newlen) 3011 { 3012 3013 if (newval && newlen) { 3014 int __user *vec = (int __user *) newval; 3015 int *min = (int *) table->extra1; 3016 int *max = (int *) table->extra2; 3017 size_t length; 3018 int i; 3019 3020 if (newlen % sizeof(int) != 0) 3021 return -EINVAL; 3022 3023 if (!table->extra1 && !table->extra2) 3024 return 0; 3025 3026 if (newlen > table->maxlen) 3027 newlen = table->maxlen; 3028 length = newlen / sizeof(int); 3029 3030 for (i = 0; i < length; i++) { 3031 int value; 3032 if (get_user(value, vec + i)) 3033 return -EFAULT; 3034 if (min && value < min[i]) 3035 return -EINVAL; 3036 if (max && value > max[i]) 3037 return -EINVAL; 3038 } 3039 } 3040 return 0; 3041 } 3042 3043 /* Strategy function to convert jiffies to seconds */ 3044 int sysctl_jiffies(struct ctl_table *table, 3045 void __user *oldval, size_t __user *oldlenp, 3046 void __user *newval, size_t newlen) 3047 { 3048 if (oldval && oldlenp) { 3049 size_t olen; 3050 3051 if (get_user(olen, oldlenp)) 3052 return -EFAULT; 3053 if (olen) { 3054 int val; 3055 3056 if (olen < sizeof(int)) 3057 return -EINVAL; 3058 3059 val = *(int *)(table->data) / HZ; 3060 if (put_user(val, (int __user *)oldval)) 3061 return -EFAULT; 3062 if (put_user(sizeof(int), oldlenp)) 3063 return -EFAULT; 3064 } 3065 } 3066 if (newval && newlen) { 3067 int new; 3068 if (newlen != sizeof(int)) 3069 return -EINVAL; 3070 if (get_user(new, (int __user *)newval)) 3071 return -EFAULT; 3072 *(int *)(table->data) = new*HZ; 3073 } 3074 return 1; 3075 } 3076 3077 /* Strategy function to convert jiffies to seconds */ 3078 int sysctl_ms_jiffies(struct ctl_table *table, 3079 void __user *oldval, size_t __user *oldlenp, 3080 void __user *newval, size_t newlen) 3081 { 3082 if (oldval && oldlenp) { 3083 size_t olen; 3084 3085 if (get_user(olen, oldlenp)) 3086 return -EFAULT; 3087 if (olen) { 3088 int val; 3089 3090 if (olen < sizeof(int)) 3091 return -EINVAL; 3092 3093 val = jiffies_to_msecs(*(int *)(table->data)); 3094 if (put_user(val, (int __user *)oldval)) 3095 return -EFAULT; 3096 if (put_user(sizeof(int), oldlenp)) 3097 return -EFAULT; 3098 } 3099 } 3100 if (newval && newlen) { 3101 int new; 3102 if (newlen != sizeof(int)) 3103 return -EINVAL; 3104 if (get_user(new, (int __user *)newval)) 3105 return -EFAULT; 3106 *(int *)(table->data) = msecs_to_jiffies(new); 3107 } 3108 return 1; 3109 } 3110 3111 3112 3113 #else /* CONFIG_SYSCTL_SYSCALL */ 3114 3115 3116 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 3117 { 3118 struct __sysctl_args tmp; 3119 int error; 3120 3121 if (copy_from_user(&tmp, args, sizeof(tmp))) 3122 return -EFAULT; 3123 3124 error = deprecated_sysctl_warning(&tmp); 3125 3126 /* If no error reading the parameters then just -ENOSYS ... */ 3127 if (!error) 3128 error = -ENOSYS; 3129 3130 return error; 3131 } 3132 3133 int sysctl_data(struct ctl_table *table, 3134 void __user *oldval, size_t __user *oldlenp, 3135 void __user *newval, size_t newlen) 3136 { 3137 return -ENOSYS; 3138 } 3139 3140 int sysctl_string(struct ctl_table *table, 3141 void __user *oldval, size_t __user *oldlenp, 3142 void __user *newval, size_t newlen) 3143 { 3144 return -ENOSYS; 3145 } 3146 3147 int sysctl_intvec(struct ctl_table *table, 3148 void __user *oldval, size_t __user *oldlenp, 3149 void __user *newval, size_t newlen) 3150 { 3151 return -ENOSYS; 3152 } 3153 3154 int sysctl_jiffies(struct ctl_table *table, 3155 void __user *oldval, size_t __user *oldlenp, 3156 void __user *newval, size_t newlen) 3157 { 3158 return -ENOSYS; 3159 } 3160 3161 int sysctl_ms_jiffies(struct ctl_table *table, 3162 void __user *oldval, size_t __user *oldlenp, 3163 void __user *newval, size_t newlen) 3164 { 3165 return -ENOSYS; 3166 } 3167 3168 #endif /* CONFIG_SYSCTL_SYSCALL */ 3169 3170 static int deprecated_sysctl_warning(struct __sysctl_args *args) 3171 { 3172 static int msg_count; 3173 int name[CTL_MAXNAME]; 3174 int i; 3175 3176 /* Check args->nlen. */ 3177 if (args->nlen < 0 || args->nlen > CTL_MAXNAME) 3178 return -ENOTDIR; 3179 3180 /* Read in the sysctl name for better debug message logging */ 3181 for (i = 0; i < args->nlen; i++) 3182 if (get_user(name[i], args->name + i)) 3183 return -EFAULT; 3184 3185 /* Ignore accesses to kernel.version */ 3186 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) 3187 return 0; 3188 3189 if (msg_count < 5) { 3190 msg_count++; 3191 printk(KERN_INFO 3192 "warning: process `%s' used the deprecated sysctl " 3193 "system call with ", current->comm); 3194 for (i = 0; i < args->nlen; i++) 3195 printk("%d.", name[i]); 3196 printk("\n"); 3197 } 3198 return 0; 3199 } 3200 3201 /* 3202 * No sense putting this after each symbol definition, twice, 3203 * exception granted :-) 3204 */ 3205 EXPORT_SYMBOL(proc_dointvec); 3206 EXPORT_SYMBOL(proc_dointvec_jiffies); 3207 EXPORT_SYMBOL(proc_dointvec_minmax); 3208 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3209 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3210 EXPORT_SYMBOL(proc_dostring); 3211 EXPORT_SYMBOL(proc_doulongvec_minmax); 3212 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3213 EXPORT_SYMBOL(register_sysctl_table); 3214 EXPORT_SYMBOL(register_sysctl_paths); 3215 EXPORT_SYMBOL(sysctl_intvec); 3216 EXPORT_SYMBOL(sysctl_jiffies); 3217 EXPORT_SYMBOL(sysctl_ms_jiffies); 3218 EXPORT_SYMBOL(sysctl_string); 3219 EXPORT_SYMBOL(sysctl_data); 3220 EXPORT_SYMBOL(unregister_sysctl_table); 3221