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/smp_lock.h> 31 #include <linux/fs.h> 32 #include <linux/init.h> 33 #include <linux/kernel.h> 34 #include <linux/kobject.h> 35 #include <linux/net.h> 36 #include <linux/sysrq.h> 37 #include <linux/highuid.h> 38 #include <linux/writeback.h> 39 #include <linux/hugetlb.h> 40 #include <linux/security.h> 41 #include <linux/initrd.h> 42 #include <linux/times.h> 43 #include <linux/limits.h> 44 #include <linux/dcache.h> 45 #include <linux/syscalls.h> 46 #include <linux/nfs_fs.h> 47 #include <linux/acpi.h> 48 #include <linux/reboot.h> 49 50 #include <asm/uaccess.h> 51 #include <asm/processor.h> 52 53 #ifdef CONFIG_X86 54 #include <asm/nmi.h> 55 #include <asm/stacktrace.h> 56 #include <asm/io.h> 57 #endif 58 59 static int deprecated_sysctl_warning(struct __sysctl_args *args); 60 61 #if defined(CONFIG_SYSCTL) 62 63 /* External variables not in a header file. */ 64 extern int C_A_D; 65 extern int print_fatal_signals; 66 extern int sysctl_overcommit_memory; 67 extern int sysctl_overcommit_ratio; 68 extern int sysctl_panic_on_oom; 69 extern int sysctl_oom_kill_allocating_task; 70 extern int max_threads; 71 extern int core_uses_pid; 72 extern int suid_dumpable; 73 extern char core_pattern[]; 74 extern int pid_max; 75 extern int min_free_kbytes; 76 extern int printk_ratelimit_jiffies; 77 extern int printk_ratelimit_burst; 78 extern int pid_max_min, pid_max_max; 79 extern int sysctl_drop_caches; 80 extern int percpu_pagelist_fraction; 81 extern int compat_log; 82 extern int maps_protect; 83 extern int sysctl_stat_interval; 84 extern int audit_argv_kb; 85 extern int latencytop_enabled; 86 87 /* Constants used for minimum and maximum */ 88 #ifdef CONFIG_DETECT_SOFTLOCKUP 89 static int one = 1; 90 static int sixty = 60; 91 #endif 92 93 #ifdef CONFIG_MMU 94 static int two = 2; 95 #endif 96 97 static int zero; 98 static int one_hundred = 100; 99 100 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 101 static int maxolduid = 65535; 102 static int minolduid; 103 static int min_percpu_pagelist_fract = 8; 104 105 static int ngroups_max = NGROUPS_MAX; 106 107 #ifdef CONFIG_KMOD 108 extern char modprobe_path[]; 109 #endif 110 #ifdef CONFIG_CHR_DEV_SG 111 extern int sg_big_buff; 112 #endif 113 114 #ifdef __sparc__ 115 extern char reboot_command []; 116 extern int stop_a_enabled; 117 extern int scons_pwroff; 118 #endif 119 120 #ifdef __hppa__ 121 extern int pwrsw_enabled; 122 extern int unaligned_enabled; 123 #endif 124 125 #ifdef CONFIG_S390 126 #ifdef CONFIG_MATHEMU 127 extern int sysctl_ieee_emulation_warnings; 128 #endif 129 extern int sysctl_userprocess_debug; 130 extern int spin_retry; 131 #endif 132 133 extern int sysctl_hz_timer; 134 135 #ifdef CONFIG_BSD_PROCESS_ACCT 136 extern int acct_parm[]; 137 #endif 138 139 #ifdef CONFIG_IA64 140 extern int no_unaligned_warning; 141 #endif 142 143 #ifdef CONFIG_RT_MUTEXES 144 extern int max_lock_depth; 145 #endif 146 147 #ifdef CONFIG_SYSCTL_SYSCALL 148 static int parse_table(int __user *, int, void __user *, size_t __user *, 149 void __user *, size_t, struct ctl_table *); 150 #endif 151 152 153 #ifdef CONFIG_PROC_SYSCTL 154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 155 void __user *buffer, size_t *lenp, loff_t *ppos); 156 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, 157 void __user *buffer, size_t *lenp, loff_t *ppos); 158 #endif 159 160 static struct ctl_table root_table[]; 161 static struct ctl_table_root sysctl_table_root; 162 static struct ctl_table_header root_table_header = { 163 .ctl_table = root_table, 164 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list), 165 .root = &sysctl_table_root, 166 }; 167 static struct ctl_table_root sysctl_table_root = { 168 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 169 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry), 170 }; 171 172 static struct ctl_table kern_table[]; 173 static struct ctl_table vm_table[]; 174 static struct ctl_table fs_table[]; 175 static struct ctl_table debug_table[]; 176 static struct ctl_table dev_table[]; 177 extern struct ctl_table random_table[]; 178 #ifdef CONFIG_INOTIFY_USER 179 extern struct ctl_table inotify_table[]; 180 #endif 181 182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 183 int sysctl_legacy_va_layout; 184 #endif 185 186 extern int prove_locking; 187 extern int lock_stat; 188 189 /* The default sysctl tables: */ 190 191 static struct ctl_table root_table[] = { 192 { 193 .ctl_name = CTL_KERN, 194 .procname = "kernel", 195 .mode = 0555, 196 .child = kern_table, 197 }, 198 { 199 .ctl_name = CTL_VM, 200 .procname = "vm", 201 .mode = 0555, 202 .child = vm_table, 203 }, 204 { 205 .ctl_name = CTL_FS, 206 .procname = "fs", 207 .mode = 0555, 208 .child = fs_table, 209 }, 210 { 211 .ctl_name = CTL_DEBUG, 212 .procname = "debug", 213 .mode = 0555, 214 .child = debug_table, 215 }, 216 { 217 .ctl_name = CTL_DEV, 218 .procname = "dev", 219 .mode = 0555, 220 .child = dev_table, 221 }, 222 /* 223 * NOTE: do not add new entries to this table unless you have read 224 * Documentation/sysctl/ctl_unnumbered.txt 225 */ 226 { .ctl_name = 0 } 227 }; 228 229 #ifdef CONFIG_SCHED_DEBUG 230 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 231 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 232 static int min_wakeup_granularity_ns; /* 0 usecs */ 233 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 234 #endif 235 236 static struct ctl_table kern_table[] = { 237 #ifdef CONFIG_SCHED_DEBUG 238 { 239 .ctl_name = CTL_UNNUMBERED, 240 .procname = "sched_min_granularity_ns", 241 .data = &sysctl_sched_min_granularity, 242 .maxlen = sizeof(unsigned int), 243 .mode = 0644, 244 .proc_handler = &sched_nr_latency_handler, 245 .strategy = &sysctl_intvec, 246 .extra1 = &min_sched_granularity_ns, 247 .extra2 = &max_sched_granularity_ns, 248 }, 249 { 250 .ctl_name = CTL_UNNUMBERED, 251 .procname = "sched_latency_ns", 252 .data = &sysctl_sched_latency, 253 .maxlen = sizeof(unsigned int), 254 .mode = 0644, 255 .proc_handler = &sched_nr_latency_handler, 256 .strategy = &sysctl_intvec, 257 .extra1 = &min_sched_granularity_ns, 258 .extra2 = &max_sched_granularity_ns, 259 }, 260 { 261 .ctl_name = CTL_UNNUMBERED, 262 .procname = "sched_wakeup_granularity_ns", 263 .data = &sysctl_sched_wakeup_granularity, 264 .maxlen = sizeof(unsigned int), 265 .mode = 0644, 266 .proc_handler = &proc_dointvec_minmax, 267 .strategy = &sysctl_intvec, 268 .extra1 = &min_wakeup_granularity_ns, 269 .extra2 = &max_wakeup_granularity_ns, 270 }, 271 { 272 .ctl_name = CTL_UNNUMBERED, 273 .procname = "sched_batch_wakeup_granularity_ns", 274 .data = &sysctl_sched_batch_wakeup_granularity, 275 .maxlen = sizeof(unsigned int), 276 .mode = 0644, 277 .proc_handler = &proc_dointvec_minmax, 278 .strategy = &sysctl_intvec, 279 .extra1 = &min_wakeup_granularity_ns, 280 .extra2 = &max_wakeup_granularity_ns, 281 }, 282 { 283 .ctl_name = CTL_UNNUMBERED, 284 .procname = "sched_child_runs_first", 285 .data = &sysctl_sched_child_runs_first, 286 .maxlen = sizeof(unsigned int), 287 .mode = 0644, 288 .proc_handler = &proc_dointvec, 289 }, 290 { 291 .ctl_name = CTL_UNNUMBERED, 292 .procname = "sched_features", 293 .data = &sysctl_sched_features, 294 .maxlen = sizeof(unsigned int), 295 .mode = 0644, 296 .proc_handler = &proc_dointvec, 297 }, 298 { 299 .ctl_name = CTL_UNNUMBERED, 300 .procname = "sched_migration_cost", 301 .data = &sysctl_sched_migration_cost, 302 .maxlen = sizeof(unsigned int), 303 .mode = 0644, 304 .proc_handler = &proc_dointvec, 305 }, 306 { 307 .ctl_name = CTL_UNNUMBERED, 308 .procname = "sched_nr_migrate", 309 .data = &sysctl_sched_nr_migrate, 310 .maxlen = sizeof(unsigned int), 311 .mode = 0644, 312 .proc_handler = &proc_dointvec, 313 }, 314 { 315 .ctl_name = CTL_UNNUMBERED, 316 .procname = "sched_rt_period_ms", 317 .data = &sysctl_sched_rt_period, 318 .maxlen = sizeof(unsigned int), 319 .mode = 0644, 320 .proc_handler = &proc_dointvec, 321 }, 322 { 323 .ctl_name = CTL_UNNUMBERED, 324 .procname = "sched_rt_ratio", 325 .data = &sysctl_sched_rt_ratio, 326 .maxlen = sizeof(unsigned int), 327 .mode = 0644, 328 .proc_handler = &proc_dointvec, 329 }, 330 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP) 331 { 332 .ctl_name = CTL_UNNUMBERED, 333 .procname = "sched_min_bal_int_shares", 334 .data = &sysctl_sched_min_bal_int_shares, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = &proc_dointvec, 338 }, 339 { 340 .ctl_name = CTL_UNNUMBERED, 341 .procname = "sched_max_bal_int_shares", 342 .data = &sysctl_sched_max_bal_int_shares, 343 .maxlen = sizeof(unsigned int), 344 .mode = 0644, 345 .proc_handler = &proc_dointvec, 346 }, 347 #endif 348 #endif 349 { 350 .ctl_name = CTL_UNNUMBERED, 351 .procname = "sched_compat_yield", 352 .data = &sysctl_sched_compat_yield, 353 .maxlen = sizeof(unsigned int), 354 .mode = 0644, 355 .proc_handler = &proc_dointvec, 356 }, 357 #ifdef CONFIG_PROVE_LOCKING 358 { 359 .ctl_name = CTL_UNNUMBERED, 360 .procname = "prove_locking", 361 .data = &prove_locking, 362 .maxlen = sizeof(int), 363 .mode = 0644, 364 .proc_handler = &proc_dointvec, 365 }, 366 #endif 367 #ifdef CONFIG_LOCK_STAT 368 { 369 .ctl_name = CTL_UNNUMBERED, 370 .procname = "lock_stat", 371 .data = &lock_stat, 372 .maxlen = sizeof(int), 373 .mode = 0644, 374 .proc_handler = &proc_dointvec, 375 }, 376 #endif 377 { 378 .ctl_name = KERN_PANIC, 379 .procname = "panic", 380 .data = &panic_timeout, 381 .maxlen = sizeof(int), 382 .mode = 0644, 383 .proc_handler = &proc_dointvec, 384 }, 385 { 386 .ctl_name = KERN_CORE_USES_PID, 387 .procname = "core_uses_pid", 388 .data = &core_uses_pid, 389 .maxlen = sizeof(int), 390 .mode = 0644, 391 .proc_handler = &proc_dointvec, 392 }, 393 #ifdef CONFIG_AUDITSYSCALL 394 { 395 .ctl_name = CTL_UNNUMBERED, 396 .procname = "audit_argv_kb", 397 .data = &audit_argv_kb, 398 .maxlen = sizeof(int), 399 .mode = 0644, 400 .proc_handler = &proc_dointvec, 401 }, 402 #endif 403 { 404 .ctl_name = KERN_CORE_PATTERN, 405 .procname = "core_pattern", 406 .data = core_pattern, 407 .maxlen = CORENAME_MAX_SIZE, 408 .mode = 0644, 409 .proc_handler = &proc_dostring, 410 .strategy = &sysctl_string, 411 }, 412 #ifdef CONFIG_PROC_SYSCTL 413 { 414 .procname = "tainted", 415 .data = &tainted, 416 .maxlen = sizeof(int), 417 .mode = 0644, 418 .proc_handler = &proc_dointvec_taint, 419 }, 420 #endif 421 #ifdef CONFIG_LATENCYTOP 422 { 423 .procname = "latencytop", 424 .data = &latencytop_enabled, 425 .maxlen = sizeof(int), 426 .mode = 0644, 427 .proc_handler = &proc_dointvec, 428 }, 429 #endif 430 #ifdef CONFIG_SECURITY_CAPABILITIES 431 { 432 .procname = "cap-bound", 433 .data = &cap_bset, 434 .maxlen = sizeof(kernel_cap_t), 435 .mode = 0600, 436 .proc_handler = &proc_dointvec_bset, 437 }, 438 #endif /* def CONFIG_SECURITY_CAPABILITIES */ 439 #ifdef CONFIG_BLK_DEV_INITRD 440 { 441 .ctl_name = KERN_REALROOTDEV, 442 .procname = "real-root-dev", 443 .data = &real_root_dev, 444 .maxlen = sizeof(int), 445 .mode = 0644, 446 .proc_handler = &proc_dointvec, 447 }, 448 #endif 449 { 450 .ctl_name = CTL_UNNUMBERED, 451 .procname = "print-fatal-signals", 452 .data = &print_fatal_signals, 453 .maxlen = sizeof(int), 454 .mode = 0644, 455 .proc_handler = &proc_dointvec, 456 }, 457 #ifdef __sparc__ 458 { 459 .ctl_name = KERN_SPARC_REBOOT, 460 .procname = "reboot-cmd", 461 .data = reboot_command, 462 .maxlen = 256, 463 .mode = 0644, 464 .proc_handler = &proc_dostring, 465 .strategy = &sysctl_string, 466 }, 467 { 468 .ctl_name = KERN_SPARC_STOP_A, 469 .procname = "stop-a", 470 .data = &stop_a_enabled, 471 .maxlen = sizeof (int), 472 .mode = 0644, 473 .proc_handler = &proc_dointvec, 474 }, 475 { 476 .ctl_name = KERN_SPARC_SCONS_PWROFF, 477 .procname = "scons-poweroff", 478 .data = &scons_pwroff, 479 .maxlen = sizeof (int), 480 .mode = 0644, 481 .proc_handler = &proc_dointvec, 482 }, 483 #endif 484 #ifdef __hppa__ 485 { 486 .ctl_name = KERN_HPPA_PWRSW, 487 .procname = "soft-power", 488 .data = &pwrsw_enabled, 489 .maxlen = sizeof (int), 490 .mode = 0644, 491 .proc_handler = &proc_dointvec, 492 }, 493 { 494 .ctl_name = KERN_HPPA_UNALIGNED, 495 .procname = "unaligned-trap", 496 .data = &unaligned_enabled, 497 .maxlen = sizeof (int), 498 .mode = 0644, 499 .proc_handler = &proc_dointvec, 500 }, 501 #endif 502 { 503 .ctl_name = KERN_CTLALTDEL, 504 .procname = "ctrl-alt-del", 505 .data = &C_A_D, 506 .maxlen = sizeof(int), 507 .mode = 0644, 508 .proc_handler = &proc_dointvec, 509 }, 510 { 511 .ctl_name = KERN_PRINTK, 512 .procname = "printk", 513 .data = &console_loglevel, 514 .maxlen = 4*sizeof(int), 515 .mode = 0644, 516 .proc_handler = &proc_dointvec, 517 }, 518 #ifdef CONFIG_KMOD 519 { 520 .ctl_name = KERN_MODPROBE, 521 .procname = "modprobe", 522 .data = &modprobe_path, 523 .maxlen = KMOD_PATH_LEN, 524 .mode = 0644, 525 .proc_handler = &proc_dostring, 526 .strategy = &sysctl_string, 527 }, 528 #endif 529 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 530 { 531 .ctl_name = KERN_HOTPLUG, 532 .procname = "hotplug", 533 .data = &uevent_helper, 534 .maxlen = UEVENT_HELPER_PATH_LEN, 535 .mode = 0644, 536 .proc_handler = &proc_dostring, 537 .strategy = &sysctl_string, 538 }, 539 #endif 540 #ifdef CONFIG_CHR_DEV_SG 541 { 542 .ctl_name = KERN_SG_BIG_BUFF, 543 .procname = "sg-big-buff", 544 .data = &sg_big_buff, 545 .maxlen = sizeof (int), 546 .mode = 0444, 547 .proc_handler = &proc_dointvec, 548 }, 549 #endif 550 #ifdef CONFIG_BSD_PROCESS_ACCT 551 { 552 .ctl_name = KERN_ACCT, 553 .procname = "acct", 554 .data = &acct_parm, 555 .maxlen = 3*sizeof(int), 556 .mode = 0644, 557 .proc_handler = &proc_dointvec, 558 }, 559 #endif 560 #ifdef CONFIG_MAGIC_SYSRQ 561 { 562 .ctl_name = KERN_SYSRQ, 563 .procname = "sysrq", 564 .data = &__sysrq_enabled, 565 .maxlen = sizeof (int), 566 .mode = 0644, 567 .proc_handler = &proc_dointvec, 568 }, 569 #endif 570 #ifdef CONFIG_PROC_SYSCTL 571 { 572 .procname = "cad_pid", 573 .data = NULL, 574 .maxlen = sizeof (int), 575 .mode = 0600, 576 .proc_handler = &proc_do_cad_pid, 577 }, 578 #endif 579 { 580 .ctl_name = KERN_MAX_THREADS, 581 .procname = "threads-max", 582 .data = &max_threads, 583 .maxlen = sizeof(int), 584 .mode = 0644, 585 .proc_handler = &proc_dointvec, 586 }, 587 { 588 .ctl_name = KERN_RANDOM, 589 .procname = "random", 590 .mode = 0555, 591 .child = random_table, 592 }, 593 { 594 .ctl_name = KERN_OVERFLOWUID, 595 .procname = "overflowuid", 596 .data = &overflowuid, 597 .maxlen = sizeof(int), 598 .mode = 0644, 599 .proc_handler = &proc_dointvec_minmax, 600 .strategy = &sysctl_intvec, 601 .extra1 = &minolduid, 602 .extra2 = &maxolduid, 603 }, 604 { 605 .ctl_name = KERN_OVERFLOWGID, 606 .procname = "overflowgid", 607 .data = &overflowgid, 608 .maxlen = sizeof(int), 609 .mode = 0644, 610 .proc_handler = &proc_dointvec_minmax, 611 .strategy = &sysctl_intvec, 612 .extra1 = &minolduid, 613 .extra2 = &maxolduid, 614 }, 615 #ifdef CONFIG_S390 616 #ifdef CONFIG_MATHEMU 617 { 618 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 619 .procname = "ieee_emulation_warnings", 620 .data = &sysctl_ieee_emulation_warnings, 621 .maxlen = sizeof(int), 622 .mode = 0644, 623 .proc_handler = &proc_dointvec, 624 }, 625 #endif 626 #ifdef CONFIG_NO_IDLE_HZ 627 { 628 .ctl_name = KERN_HZ_TIMER, 629 .procname = "hz_timer", 630 .data = &sysctl_hz_timer, 631 .maxlen = sizeof(int), 632 .mode = 0644, 633 .proc_handler = &proc_dointvec, 634 }, 635 #endif 636 { 637 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 638 .procname = "userprocess_debug", 639 .data = &sysctl_userprocess_debug, 640 .maxlen = sizeof(int), 641 .mode = 0644, 642 .proc_handler = &proc_dointvec, 643 }, 644 #endif 645 { 646 .ctl_name = KERN_PIDMAX, 647 .procname = "pid_max", 648 .data = &pid_max, 649 .maxlen = sizeof (int), 650 .mode = 0644, 651 .proc_handler = &proc_dointvec_minmax, 652 .strategy = sysctl_intvec, 653 .extra1 = &pid_max_min, 654 .extra2 = &pid_max_max, 655 }, 656 { 657 .ctl_name = KERN_PANIC_ON_OOPS, 658 .procname = "panic_on_oops", 659 .data = &panic_on_oops, 660 .maxlen = sizeof(int), 661 .mode = 0644, 662 .proc_handler = &proc_dointvec, 663 }, 664 { 665 .ctl_name = KERN_PRINTK_RATELIMIT, 666 .procname = "printk_ratelimit", 667 .data = &printk_ratelimit_jiffies, 668 .maxlen = sizeof(int), 669 .mode = 0644, 670 .proc_handler = &proc_dointvec_jiffies, 671 .strategy = &sysctl_jiffies, 672 }, 673 { 674 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 675 .procname = "printk_ratelimit_burst", 676 .data = &printk_ratelimit_burst, 677 .maxlen = sizeof(int), 678 .mode = 0644, 679 .proc_handler = &proc_dointvec, 680 }, 681 { 682 .ctl_name = KERN_NGROUPS_MAX, 683 .procname = "ngroups_max", 684 .data = &ngroups_max, 685 .maxlen = sizeof (int), 686 .mode = 0444, 687 .proc_handler = &proc_dointvec, 688 }, 689 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 690 { 691 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 692 .procname = "unknown_nmi_panic", 693 .data = &unknown_nmi_panic, 694 .maxlen = sizeof (int), 695 .mode = 0644, 696 .proc_handler = &proc_dointvec, 697 }, 698 { 699 .procname = "nmi_watchdog", 700 .data = &nmi_watchdog_enabled, 701 .maxlen = sizeof (int), 702 .mode = 0644, 703 .proc_handler = &proc_nmi_enabled, 704 }, 705 #endif 706 #if defined(CONFIG_X86) 707 { 708 .ctl_name = KERN_PANIC_ON_NMI, 709 .procname = "panic_on_unrecovered_nmi", 710 .data = &panic_on_unrecovered_nmi, 711 .maxlen = sizeof(int), 712 .mode = 0644, 713 .proc_handler = &proc_dointvec, 714 }, 715 { 716 .ctl_name = KERN_BOOTLOADER_TYPE, 717 .procname = "bootloader_type", 718 .data = &bootloader_type, 719 .maxlen = sizeof (int), 720 .mode = 0444, 721 .proc_handler = &proc_dointvec, 722 }, 723 { 724 .ctl_name = CTL_UNNUMBERED, 725 .procname = "kstack_depth_to_print", 726 .data = &kstack_depth_to_print, 727 .maxlen = sizeof(int), 728 .mode = 0644, 729 .proc_handler = &proc_dointvec, 730 }, 731 { 732 .ctl_name = CTL_UNNUMBERED, 733 .procname = "io_delay_type", 734 .data = &io_delay_type, 735 .maxlen = sizeof(int), 736 .mode = 0644, 737 .proc_handler = &proc_dointvec, 738 }, 739 #endif 740 #if defined(CONFIG_MMU) 741 { 742 .ctl_name = KERN_RANDOMIZE, 743 .procname = "randomize_va_space", 744 .data = &randomize_va_space, 745 .maxlen = sizeof(int), 746 .mode = 0644, 747 .proc_handler = &proc_dointvec, 748 }, 749 #endif 750 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 751 { 752 .ctl_name = KERN_SPIN_RETRY, 753 .procname = "spin_retry", 754 .data = &spin_retry, 755 .maxlen = sizeof (int), 756 .mode = 0644, 757 .proc_handler = &proc_dointvec, 758 }, 759 #endif 760 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 761 { 762 .procname = "acpi_video_flags", 763 .data = &acpi_realmode_flags, 764 .maxlen = sizeof (unsigned long), 765 .mode = 0644, 766 .proc_handler = &proc_doulongvec_minmax, 767 }, 768 #endif 769 #ifdef CONFIG_IA64 770 { 771 .ctl_name = KERN_IA64_UNALIGNED, 772 .procname = "ignore-unaligned-usertrap", 773 .data = &no_unaligned_warning, 774 .maxlen = sizeof (int), 775 .mode = 0644, 776 .proc_handler = &proc_dointvec, 777 }, 778 #endif 779 #ifdef CONFIG_DETECT_SOFTLOCKUP 780 { 781 .ctl_name = CTL_UNNUMBERED, 782 .procname = "softlockup_thresh", 783 .data = &softlockup_thresh, 784 .maxlen = sizeof(unsigned long), 785 .mode = 0644, 786 .proc_handler = &proc_doulongvec_minmax, 787 .strategy = &sysctl_intvec, 788 .extra1 = &one, 789 .extra2 = &sixty, 790 }, 791 { 792 .ctl_name = CTL_UNNUMBERED, 793 .procname = "hung_task_check_count", 794 .data = &sysctl_hung_task_check_count, 795 .maxlen = sizeof(unsigned long), 796 .mode = 0644, 797 .proc_handler = &proc_doulongvec_minmax, 798 .strategy = &sysctl_intvec, 799 }, 800 { 801 .ctl_name = CTL_UNNUMBERED, 802 .procname = "hung_task_timeout_secs", 803 .data = &sysctl_hung_task_timeout_secs, 804 .maxlen = sizeof(unsigned long), 805 .mode = 0644, 806 .proc_handler = &proc_doulongvec_minmax, 807 .strategy = &sysctl_intvec, 808 }, 809 { 810 .ctl_name = CTL_UNNUMBERED, 811 .procname = "hung_task_warnings", 812 .data = &sysctl_hung_task_warnings, 813 .maxlen = sizeof(unsigned long), 814 .mode = 0644, 815 .proc_handler = &proc_doulongvec_minmax, 816 .strategy = &sysctl_intvec, 817 }, 818 #endif 819 #ifdef CONFIG_COMPAT 820 { 821 .ctl_name = KERN_COMPAT_LOG, 822 .procname = "compat-log", 823 .data = &compat_log, 824 .maxlen = sizeof (int), 825 .mode = 0644, 826 .proc_handler = &proc_dointvec, 827 }, 828 #endif 829 #ifdef CONFIG_RT_MUTEXES 830 { 831 .ctl_name = KERN_MAX_LOCK_DEPTH, 832 .procname = "max_lock_depth", 833 .data = &max_lock_depth, 834 .maxlen = sizeof(int), 835 .mode = 0644, 836 .proc_handler = &proc_dointvec, 837 }, 838 #endif 839 #ifdef CONFIG_PROC_FS 840 { 841 .ctl_name = CTL_UNNUMBERED, 842 .procname = "maps_protect", 843 .data = &maps_protect, 844 .maxlen = sizeof(int), 845 .mode = 0644, 846 .proc_handler = &proc_dointvec, 847 }, 848 #endif 849 { 850 .ctl_name = CTL_UNNUMBERED, 851 .procname = "poweroff_cmd", 852 .data = &poweroff_cmd, 853 .maxlen = POWEROFF_CMD_PATH_LEN, 854 .mode = 0644, 855 .proc_handler = &proc_dostring, 856 .strategy = &sysctl_string, 857 }, 858 /* 859 * NOTE: do not add new entries to this table unless you have read 860 * Documentation/sysctl/ctl_unnumbered.txt 861 */ 862 { .ctl_name = 0 } 863 }; 864 865 static struct ctl_table vm_table[] = { 866 { 867 .ctl_name = VM_OVERCOMMIT_MEMORY, 868 .procname = "overcommit_memory", 869 .data = &sysctl_overcommit_memory, 870 .maxlen = sizeof(sysctl_overcommit_memory), 871 .mode = 0644, 872 .proc_handler = &proc_dointvec, 873 }, 874 { 875 .ctl_name = VM_PANIC_ON_OOM, 876 .procname = "panic_on_oom", 877 .data = &sysctl_panic_on_oom, 878 .maxlen = sizeof(sysctl_panic_on_oom), 879 .mode = 0644, 880 .proc_handler = &proc_dointvec, 881 }, 882 { 883 .ctl_name = CTL_UNNUMBERED, 884 .procname = "oom_kill_allocating_task", 885 .data = &sysctl_oom_kill_allocating_task, 886 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 887 .mode = 0644, 888 .proc_handler = &proc_dointvec, 889 }, 890 { 891 .ctl_name = VM_OVERCOMMIT_RATIO, 892 .procname = "overcommit_ratio", 893 .data = &sysctl_overcommit_ratio, 894 .maxlen = sizeof(sysctl_overcommit_ratio), 895 .mode = 0644, 896 .proc_handler = &proc_dointvec, 897 }, 898 { 899 .ctl_name = VM_PAGE_CLUSTER, 900 .procname = "page-cluster", 901 .data = &page_cluster, 902 .maxlen = sizeof(int), 903 .mode = 0644, 904 .proc_handler = &proc_dointvec, 905 }, 906 { 907 .ctl_name = VM_DIRTY_BACKGROUND, 908 .procname = "dirty_background_ratio", 909 .data = &dirty_background_ratio, 910 .maxlen = sizeof(dirty_background_ratio), 911 .mode = 0644, 912 .proc_handler = &proc_dointvec_minmax, 913 .strategy = &sysctl_intvec, 914 .extra1 = &zero, 915 .extra2 = &one_hundred, 916 }, 917 { 918 .ctl_name = VM_DIRTY_RATIO, 919 .procname = "dirty_ratio", 920 .data = &vm_dirty_ratio, 921 .maxlen = sizeof(vm_dirty_ratio), 922 .mode = 0644, 923 .proc_handler = &dirty_ratio_handler, 924 .strategy = &sysctl_intvec, 925 .extra1 = &zero, 926 .extra2 = &one_hundred, 927 }, 928 { 929 .procname = "dirty_writeback_centisecs", 930 .data = &dirty_writeback_interval, 931 .maxlen = sizeof(dirty_writeback_interval), 932 .mode = 0644, 933 .proc_handler = &dirty_writeback_centisecs_handler, 934 }, 935 { 936 .procname = "dirty_expire_centisecs", 937 .data = &dirty_expire_interval, 938 .maxlen = sizeof(dirty_expire_interval), 939 .mode = 0644, 940 .proc_handler = &proc_dointvec_userhz_jiffies, 941 }, 942 { 943 .ctl_name = VM_NR_PDFLUSH_THREADS, 944 .procname = "nr_pdflush_threads", 945 .data = &nr_pdflush_threads, 946 .maxlen = sizeof nr_pdflush_threads, 947 .mode = 0444 /* read-only*/, 948 .proc_handler = &proc_dointvec, 949 }, 950 { 951 .ctl_name = VM_SWAPPINESS, 952 .procname = "swappiness", 953 .data = &vm_swappiness, 954 .maxlen = sizeof(vm_swappiness), 955 .mode = 0644, 956 .proc_handler = &proc_dointvec_minmax, 957 .strategy = &sysctl_intvec, 958 .extra1 = &zero, 959 .extra2 = &one_hundred, 960 }, 961 #ifdef CONFIG_HUGETLB_PAGE 962 { 963 .procname = "nr_hugepages", 964 .data = &max_huge_pages, 965 .maxlen = sizeof(unsigned long), 966 .mode = 0644, 967 .proc_handler = &hugetlb_sysctl_handler, 968 .extra1 = (void *)&hugetlb_zero, 969 .extra2 = (void *)&hugetlb_infinity, 970 }, 971 { 972 .ctl_name = VM_HUGETLB_GROUP, 973 .procname = "hugetlb_shm_group", 974 .data = &sysctl_hugetlb_shm_group, 975 .maxlen = sizeof(gid_t), 976 .mode = 0644, 977 .proc_handler = &proc_dointvec, 978 }, 979 { 980 .ctl_name = CTL_UNNUMBERED, 981 .procname = "hugepages_treat_as_movable", 982 .data = &hugepages_treat_as_movable, 983 .maxlen = sizeof(int), 984 .mode = 0644, 985 .proc_handler = &hugetlb_treat_movable_handler, 986 }, 987 { 988 .ctl_name = CTL_UNNUMBERED, 989 .procname = "nr_overcommit_hugepages", 990 .data = &nr_overcommit_huge_pages, 991 .maxlen = sizeof(nr_overcommit_huge_pages), 992 .mode = 0644, 993 .proc_handler = &proc_doulongvec_minmax, 994 }, 995 #endif 996 { 997 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 998 .procname = "lowmem_reserve_ratio", 999 .data = &sysctl_lowmem_reserve_ratio, 1000 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1001 .mode = 0644, 1002 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 1003 .strategy = &sysctl_intvec, 1004 }, 1005 { 1006 .ctl_name = VM_DROP_PAGECACHE, 1007 .procname = "drop_caches", 1008 .data = &sysctl_drop_caches, 1009 .maxlen = sizeof(int), 1010 .mode = 0644, 1011 .proc_handler = drop_caches_sysctl_handler, 1012 .strategy = &sysctl_intvec, 1013 }, 1014 { 1015 .ctl_name = VM_MIN_FREE_KBYTES, 1016 .procname = "min_free_kbytes", 1017 .data = &min_free_kbytes, 1018 .maxlen = sizeof(min_free_kbytes), 1019 .mode = 0644, 1020 .proc_handler = &min_free_kbytes_sysctl_handler, 1021 .strategy = &sysctl_intvec, 1022 .extra1 = &zero, 1023 }, 1024 { 1025 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 1026 .procname = "percpu_pagelist_fraction", 1027 .data = &percpu_pagelist_fraction, 1028 .maxlen = sizeof(percpu_pagelist_fraction), 1029 .mode = 0644, 1030 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 1031 .strategy = &sysctl_intvec, 1032 .extra1 = &min_percpu_pagelist_fract, 1033 }, 1034 #ifdef CONFIG_MMU 1035 { 1036 .ctl_name = VM_MAX_MAP_COUNT, 1037 .procname = "max_map_count", 1038 .data = &sysctl_max_map_count, 1039 .maxlen = sizeof(sysctl_max_map_count), 1040 .mode = 0644, 1041 .proc_handler = &proc_dointvec 1042 }, 1043 #endif 1044 { 1045 .ctl_name = VM_LAPTOP_MODE, 1046 .procname = "laptop_mode", 1047 .data = &laptop_mode, 1048 .maxlen = sizeof(laptop_mode), 1049 .mode = 0644, 1050 .proc_handler = &proc_dointvec_jiffies, 1051 .strategy = &sysctl_jiffies, 1052 }, 1053 { 1054 .ctl_name = VM_BLOCK_DUMP, 1055 .procname = "block_dump", 1056 .data = &block_dump, 1057 .maxlen = sizeof(block_dump), 1058 .mode = 0644, 1059 .proc_handler = &proc_dointvec, 1060 .strategy = &sysctl_intvec, 1061 .extra1 = &zero, 1062 }, 1063 { 1064 .ctl_name = VM_VFS_CACHE_PRESSURE, 1065 .procname = "vfs_cache_pressure", 1066 .data = &sysctl_vfs_cache_pressure, 1067 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1068 .mode = 0644, 1069 .proc_handler = &proc_dointvec, 1070 .strategy = &sysctl_intvec, 1071 .extra1 = &zero, 1072 }, 1073 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1074 { 1075 .ctl_name = VM_LEGACY_VA_LAYOUT, 1076 .procname = "legacy_va_layout", 1077 .data = &sysctl_legacy_va_layout, 1078 .maxlen = sizeof(sysctl_legacy_va_layout), 1079 .mode = 0644, 1080 .proc_handler = &proc_dointvec, 1081 .strategy = &sysctl_intvec, 1082 .extra1 = &zero, 1083 }, 1084 #endif 1085 #ifdef CONFIG_NUMA 1086 { 1087 .ctl_name = VM_ZONE_RECLAIM_MODE, 1088 .procname = "zone_reclaim_mode", 1089 .data = &zone_reclaim_mode, 1090 .maxlen = sizeof(zone_reclaim_mode), 1091 .mode = 0644, 1092 .proc_handler = &proc_dointvec, 1093 .strategy = &sysctl_intvec, 1094 .extra1 = &zero, 1095 }, 1096 { 1097 .ctl_name = VM_MIN_UNMAPPED, 1098 .procname = "min_unmapped_ratio", 1099 .data = &sysctl_min_unmapped_ratio, 1100 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1101 .mode = 0644, 1102 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, 1103 .strategy = &sysctl_intvec, 1104 .extra1 = &zero, 1105 .extra2 = &one_hundred, 1106 }, 1107 { 1108 .ctl_name = VM_MIN_SLAB, 1109 .procname = "min_slab_ratio", 1110 .data = &sysctl_min_slab_ratio, 1111 .maxlen = sizeof(sysctl_min_slab_ratio), 1112 .mode = 0644, 1113 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, 1114 .strategy = &sysctl_intvec, 1115 .extra1 = &zero, 1116 .extra2 = &one_hundred, 1117 }, 1118 #endif 1119 #ifdef CONFIG_SMP 1120 { 1121 .ctl_name = CTL_UNNUMBERED, 1122 .procname = "stat_interval", 1123 .data = &sysctl_stat_interval, 1124 .maxlen = sizeof(sysctl_stat_interval), 1125 .mode = 0644, 1126 .proc_handler = &proc_dointvec_jiffies, 1127 .strategy = &sysctl_jiffies, 1128 }, 1129 #endif 1130 #ifdef CONFIG_SECURITY 1131 { 1132 .ctl_name = CTL_UNNUMBERED, 1133 .procname = "mmap_min_addr", 1134 .data = &mmap_min_addr, 1135 .maxlen = sizeof(unsigned long), 1136 .mode = 0644, 1137 .proc_handler = &proc_doulongvec_minmax, 1138 }, 1139 #endif 1140 #ifdef CONFIG_NUMA 1141 { 1142 .ctl_name = CTL_UNNUMBERED, 1143 .procname = "numa_zonelist_order", 1144 .data = &numa_zonelist_order, 1145 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1146 .mode = 0644, 1147 .proc_handler = &numa_zonelist_order_handler, 1148 .strategy = &sysctl_string, 1149 }, 1150 #endif 1151 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1152 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1153 { 1154 .ctl_name = VM_VDSO_ENABLED, 1155 .procname = "vdso_enabled", 1156 .data = &vdso_enabled, 1157 .maxlen = sizeof(vdso_enabled), 1158 .mode = 0644, 1159 .proc_handler = &proc_dointvec, 1160 .strategy = &sysctl_intvec, 1161 .extra1 = &zero, 1162 }, 1163 #endif 1164 /* 1165 * NOTE: do not add new entries to this table unless you have read 1166 * Documentation/sysctl/ctl_unnumbered.txt 1167 */ 1168 { .ctl_name = 0 } 1169 }; 1170 1171 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1172 static struct ctl_table binfmt_misc_table[] = { 1173 { .ctl_name = 0 } 1174 }; 1175 #endif 1176 1177 static struct ctl_table fs_table[] = { 1178 { 1179 .ctl_name = FS_NRINODE, 1180 .procname = "inode-nr", 1181 .data = &inodes_stat, 1182 .maxlen = 2*sizeof(int), 1183 .mode = 0444, 1184 .proc_handler = &proc_dointvec, 1185 }, 1186 { 1187 .ctl_name = FS_STATINODE, 1188 .procname = "inode-state", 1189 .data = &inodes_stat, 1190 .maxlen = 7*sizeof(int), 1191 .mode = 0444, 1192 .proc_handler = &proc_dointvec, 1193 }, 1194 { 1195 .procname = "file-nr", 1196 .data = &files_stat, 1197 .maxlen = 3*sizeof(int), 1198 .mode = 0444, 1199 .proc_handler = &proc_nr_files, 1200 }, 1201 { 1202 .ctl_name = FS_MAXFILE, 1203 .procname = "file-max", 1204 .data = &files_stat.max_files, 1205 .maxlen = sizeof(int), 1206 .mode = 0644, 1207 .proc_handler = &proc_dointvec, 1208 }, 1209 { 1210 .ctl_name = FS_DENTRY, 1211 .procname = "dentry-state", 1212 .data = &dentry_stat, 1213 .maxlen = 6*sizeof(int), 1214 .mode = 0444, 1215 .proc_handler = &proc_dointvec, 1216 }, 1217 { 1218 .ctl_name = FS_OVERFLOWUID, 1219 .procname = "overflowuid", 1220 .data = &fs_overflowuid, 1221 .maxlen = sizeof(int), 1222 .mode = 0644, 1223 .proc_handler = &proc_dointvec_minmax, 1224 .strategy = &sysctl_intvec, 1225 .extra1 = &minolduid, 1226 .extra2 = &maxolduid, 1227 }, 1228 { 1229 .ctl_name = FS_OVERFLOWGID, 1230 .procname = "overflowgid", 1231 .data = &fs_overflowgid, 1232 .maxlen = sizeof(int), 1233 .mode = 0644, 1234 .proc_handler = &proc_dointvec_minmax, 1235 .strategy = &sysctl_intvec, 1236 .extra1 = &minolduid, 1237 .extra2 = &maxolduid, 1238 }, 1239 { 1240 .ctl_name = FS_LEASES, 1241 .procname = "leases-enable", 1242 .data = &leases_enable, 1243 .maxlen = sizeof(int), 1244 .mode = 0644, 1245 .proc_handler = &proc_dointvec, 1246 }, 1247 #ifdef CONFIG_DNOTIFY 1248 { 1249 .ctl_name = FS_DIR_NOTIFY, 1250 .procname = "dir-notify-enable", 1251 .data = &dir_notify_enable, 1252 .maxlen = sizeof(int), 1253 .mode = 0644, 1254 .proc_handler = &proc_dointvec, 1255 }, 1256 #endif 1257 #ifdef CONFIG_MMU 1258 { 1259 .ctl_name = FS_LEASE_TIME, 1260 .procname = "lease-break-time", 1261 .data = &lease_break_time, 1262 .maxlen = sizeof(int), 1263 .mode = 0644, 1264 .proc_handler = &proc_dointvec_minmax, 1265 .strategy = &sysctl_intvec, 1266 .extra1 = &zero, 1267 .extra2 = &two, 1268 }, 1269 { 1270 .procname = "aio-nr", 1271 .data = &aio_nr, 1272 .maxlen = sizeof(aio_nr), 1273 .mode = 0444, 1274 .proc_handler = &proc_doulongvec_minmax, 1275 }, 1276 { 1277 .procname = "aio-max-nr", 1278 .data = &aio_max_nr, 1279 .maxlen = sizeof(aio_max_nr), 1280 .mode = 0644, 1281 .proc_handler = &proc_doulongvec_minmax, 1282 }, 1283 #ifdef CONFIG_INOTIFY_USER 1284 { 1285 .ctl_name = FS_INOTIFY, 1286 .procname = "inotify", 1287 .mode = 0555, 1288 .child = inotify_table, 1289 }, 1290 #endif 1291 #endif 1292 { 1293 .ctl_name = KERN_SETUID_DUMPABLE, 1294 .procname = "suid_dumpable", 1295 .data = &suid_dumpable, 1296 .maxlen = sizeof(int), 1297 .mode = 0644, 1298 .proc_handler = &proc_dointvec, 1299 }, 1300 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1301 { 1302 .ctl_name = CTL_UNNUMBERED, 1303 .procname = "binfmt_misc", 1304 .mode = 0555, 1305 .child = binfmt_misc_table, 1306 }, 1307 #endif 1308 /* 1309 * NOTE: do not add new entries to this table unless you have read 1310 * Documentation/sysctl/ctl_unnumbered.txt 1311 */ 1312 { .ctl_name = 0 } 1313 }; 1314 1315 static struct ctl_table debug_table[] = { 1316 #if defined(CONFIG_X86) || defined(CONFIG_PPC) 1317 { 1318 .ctl_name = CTL_UNNUMBERED, 1319 .procname = "exception-trace", 1320 .data = &show_unhandled_signals, 1321 .maxlen = sizeof(int), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec 1324 }, 1325 #endif 1326 { .ctl_name = 0 } 1327 }; 1328 1329 static struct ctl_table dev_table[] = { 1330 { .ctl_name = 0 } 1331 }; 1332 1333 static DEFINE_SPINLOCK(sysctl_lock); 1334 1335 /* called under sysctl_lock */ 1336 static int use_table(struct ctl_table_header *p) 1337 { 1338 if (unlikely(p->unregistering)) 1339 return 0; 1340 p->used++; 1341 return 1; 1342 } 1343 1344 /* called under sysctl_lock */ 1345 static void unuse_table(struct ctl_table_header *p) 1346 { 1347 if (!--p->used) 1348 if (unlikely(p->unregistering)) 1349 complete(p->unregistering); 1350 } 1351 1352 /* called under sysctl_lock, will reacquire if has to wait */ 1353 static void start_unregistering(struct ctl_table_header *p) 1354 { 1355 /* 1356 * if p->used is 0, nobody will ever touch that entry again; 1357 * we'll eliminate all paths to it before dropping sysctl_lock 1358 */ 1359 if (unlikely(p->used)) { 1360 struct completion wait; 1361 init_completion(&wait); 1362 p->unregistering = &wait; 1363 spin_unlock(&sysctl_lock); 1364 wait_for_completion(&wait); 1365 spin_lock(&sysctl_lock); 1366 } 1367 /* 1368 * do not remove from the list until nobody holds it; walking the 1369 * list in do_sysctl() relies on that. 1370 */ 1371 list_del_init(&p->ctl_entry); 1372 } 1373 1374 void sysctl_head_finish(struct ctl_table_header *head) 1375 { 1376 if (!head) 1377 return; 1378 spin_lock(&sysctl_lock); 1379 unuse_table(head); 1380 spin_unlock(&sysctl_lock); 1381 } 1382 1383 static struct list_head * 1384 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1385 { 1386 struct list_head *header_list; 1387 header_list = &root->header_list; 1388 if (root->lookup) 1389 header_list = root->lookup(root, namespaces); 1390 return header_list; 1391 } 1392 1393 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1394 struct ctl_table_header *prev) 1395 { 1396 struct ctl_table_root *root; 1397 struct list_head *header_list; 1398 struct ctl_table_header *head; 1399 struct list_head *tmp; 1400 1401 spin_lock(&sysctl_lock); 1402 if (prev) { 1403 head = prev; 1404 tmp = &prev->ctl_entry; 1405 unuse_table(prev); 1406 goto next; 1407 } 1408 tmp = &root_table_header.ctl_entry; 1409 for (;;) { 1410 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1411 1412 if (!use_table(head)) 1413 goto next; 1414 spin_unlock(&sysctl_lock); 1415 return head; 1416 next: 1417 root = head->root; 1418 tmp = tmp->next; 1419 header_list = lookup_header_list(root, namespaces); 1420 if (tmp != header_list) 1421 continue; 1422 1423 do { 1424 root = list_entry(root->root_list.next, 1425 struct ctl_table_root, root_list); 1426 if (root == &sysctl_table_root) 1427 goto out; 1428 header_list = lookup_header_list(root, namespaces); 1429 } while (list_empty(header_list)); 1430 tmp = header_list->next; 1431 } 1432 out: 1433 spin_unlock(&sysctl_lock); 1434 return NULL; 1435 } 1436 1437 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1438 { 1439 return __sysctl_head_next(current->nsproxy, prev); 1440 } 1441 1442 void register_sysctl_root(struct ctl_table_root *root) 1443 { 1444 spin_lock(&sysctl_lock); 1445 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1446 spin_unlock(&sysctl_lock); 1447 } 1448 1449 #ifdef CONFIG_SYSCTL_SYSCALL 1450 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1451 void __user *newval, size_t newlen) 1452 { 1453 struct ctl_table_header *head; 1454 int error = -ENOTDIR; 1455 1456 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1457 return -ENOTDIR; 1458 if (oldval) { 1459 int old_len; 1460 if (!oldlenp || get_user(old_len, oldlenp)) 1461 return -EFAULT; 1462 } 1463 1464 for (head = sysctl_head_next(NULL); head; 1465 head = sysctl_head_next(head)) { 1466 error = parse_table(name, nlen, oldval, oldlenp, 1467 newval, newlen, head->ctl_table); 1468 if (error != -ENOTDIR) { 1469 sysctl_head_finish(head); 1470 break; 1471 } 1472 } 1473 return error; 1474 } 1475 1476 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 1477 { 1478 struct __sysctl_args tmp; 1479 int error; 1480 1481 if (copy_from_user(&tmp, args, sizeof(tmp))) 1482 return -EFAULT; 1483 1484 error = deprecated_sysctl_warning(&tmp); 1485 if (error) 1486 goto out; 1487 1488 lock_kernel(); 1489 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1490 tmp.newval, tmp.newlen); 1491 unlock_kernel(); 1492 out: 1493 return error; 1494 } 1495 #endif /* CONFIG_SYSCTL_SYSCALL */ 1496 1497 /* 1498 * sysctl_perm does NOT grant the superuser all rights automatically, because 1499 * some sysctl variables are readonly even to root. 1500 */ 1501 1502 static int test_perm(int mode, int op) 1503 { 1504 if (!current->euid) 1505 mode >>= 6; 1506 else if (in_egroup_p(0)) 1507 mode >>= 3; 1508 if ((mode & op & 0007) == op) 1509 return 0; 1510 return -EACCES; 1511 } 1512 1513 int sysctl_perm(struct ctl_table *table, int op) 1514 { 1515 int error; 1516 error = security_sysctl(table, op); 1517 if (error) 1518 return error; 1519 return test_perm(table->mode, op); 1520 } 1521 1522 #ifdef CONFIG_SYSCTL_SYSCALL 1523 static int parse_table(int __user *name, int nlen, 1524 void __user *oldval, size_t __user *oldlenp, 1525 void __user *newval, size_t newlen, 1526 struct ctl_table *table) 1527 { 1528 int n; 1529 repeat: 1530 if (!nlen) 1531 return -ENOTDIR; 1532 if (get_user(n, name)) 1533 return -EFAULT; 1534 for ( ; table->ctl_name || table->procname; table++) { 1535 if (!table->ctl_name) 1536 continue; 1537 if (n == table->ctl_name) { 1538 int error; 1539 if (table->child) { 1540 if (sysctl_perm(table, 001)) 1541 return -EPERM; 1542 name++; 1543 nlen--; 1544 table = table->child; 1545 goto repeat; 1546 } 1547 error = do_sysctl_strategy(table, name, nlen, 1548 oldval, oldlenp, 1549 newval, newlen); 1550 return error; 1551 } 1552 } 1553 return -ENOTDIR; 1554 } 1555 1556 /* Perform the actual read/write of a sysctl table entry. */ 1557 int do_sysctl_strategy (struct ctl_table *table, 1558 int __user *name, int nlen, 1559 void __user *oldval, size_t __user *oldlenp, 1560 void __user *newval, size_t newlen) 1561 { 1562 int op = 0, rc; 1563 1564 if (oldval) 1565 op |= 004; 1566 if (newval) 1567 op |= 002; 1568 if (sysctl_perm(table, op)) 1569 return -EPERM; 1570 1571 if (table->strategy) { 1572 rc = table->strategy(table, name, nlen, oldval, oldlenp, 1573 newval, newlen); 1574 if (rc < 0) 1575 return rc; 1576 if (rc > 0) 1577 return 0; 1578 } 1579 1580 /* If there is no strategy routine, or if the strategy returns 1581 * zero, proceed with automatic r/w */ 1582 if (table->data && table->maxlen) { 1583 rc = sysctl_data(table, name, nlen, oldval, oldlenp, 1584 newval, newlen); 1585 if (rc < 0) 1586 return rc; 1587 } 1588 return 0; 1589 } 1590 #endif /* CONFIG_SYSCTL_SYSCALL */ 1591 1592 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1593 { 1594 for (; table->ctl_name || table->procname; table++) { 1595 table->parent = parent; 1596 if (table->child) 1597 sysctl_set_parent(table, table->child); 1598 } 1599 } 1600 1601 static __init int sysctl_init(void) 1602 { 1603 int err; 1604 sysctl_set_parent(NULL, root_table); 1605 err = sysctl_check_table(current->nsproxy, root_table); 1606 return 0; 1607 } 1608 1609 core_initcall(sysctl_init); 1610 1611 /** 1612 * __register_sysctl_paths - register a sysctl hierarchy 1613 * @root: List of sysctl headers to register on 1614 * @namespaces: Data to compute which lists of sysctl entries are visible 1615 * @path: The path to the directory the sysctl table is in. 1616 * @table: the top-level table structure 1617 * 1618 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1619 * array. A completely 0 filled entry terminates the table. 1620 * 1621 * The members of the &struct ctl_table structure are used as follows: 1622 * 1623 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1624 * must be unique within that level of sysctl 1625 * 1626 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1627 * enter a sysctl file 1628 * 1629 * data - a pointer to data for use by proc_handler 1630 * 1631 * maxlen - the maximum size in bytes of the data 1632 * 1633 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1634 * 1635 * child - a pointer to the child sysctl table if this entry is a directory, or 1636 * %NULL. 1637 * 1638 * proc_handler - the text handler routine (described below) 1639 * 1640 * strategy - the strategy routine (described below) 1641 * 1642 * de - for internal use by the sysctl routines 1643 * 1644 * extra1, extra2 - extra pointers usable by the proc handler routines 1645 * 1646 * Leaf nodes in the sysctl tree will be represented by a single file 1647 * under /proc; non-leaf nodes will be represented by directories. 1648 * 1649 * sysctl(2) can automatically manage read and write requests through 1650 * the sysctl table. The data and maxlen fields of the ctl_table 1651 * struct enable minimal validation of the values being written to be 1652 * performed, and the mode field allows minimal authentication. 1653 * 1654 * More sophisticated management can be enabled by the provision of a 1655 * strategy routine with the table entry. This will be called before 1656 * any automatic read or write of the data is performed. 1657 * 1658 * The strategy routine may return 1659 * 1660 * < 0 - Error occurred (error is passed to user process) 1661 * 1662 * 0 - OK - proceed with automatic read or write. 1663 * 1664 * > 0 - OK - read or write has been done by the strategy routine, so 1665 * return immediately. 1666 * 1667 * There must be a proc_handler routine for any terminal nodes 1668 * mirrored under /proc/sys (non-terminals are handled by a built-in 1669 * directory handler). Several default handlers are available to 1670 * cover common cases - 1671 * 1672 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1673 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1674 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1675 * 1676 * It is the handler's job to read the input buffer from user memory 1677 * and process it. The handler should return 0 on success. 1678 * 1679 * This routine returns %NULL on a failure to register, and a pointer 1680 * to the table header on success. 1681 */ 1682 struct ctl_table_header *__register_sysctl_paths( 1683 struct ctl_table_root *root, 1684 struct nsproxy *namespaces, 1685 const struct ctl_path *path, struct ctl_table *table) 1686 { 1687 struct list_head *header_list; 1688 struct ctl_table_header *header; 1689 struct ctl_table *new, **prevp; 1690 unsigned int n, npath; 1691 1692 /* Count the path components */ 1693 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) 1694 ; 1695 1696 /* 1697 * For each path component, allocate a 2-element ctl_table array. 1698 * The first array element will be filled with the sysctl entry 1699 * for this, the second will be the sentinel (ctl_name == 0). 1700 * 1701 * We allocate everything in one go so that we don't have to 1702 * worry about freeing additional memory in unregister_sysctl_table. 1703 */ 1704 header = kzalloc(sizeof(struct ctl_table_header) + 1705 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1706 if (!header) 1707 return NULL; 1708 1709 new = (struct ctl_table *) (header + 1); 1710 1711 /* Now connect the dots */ 1712 prevp = &header->ctl_table; 1713 for (n = 0; n < npath; ++n, ++path) { 1714 /* Copy the procname */ 1715 new->procname = path->procname; 1716 new->ctl_name = path->ctl_name; 1717 new->mode = 0555; 1718 1719 *prevp = new; 1720 prevp = &new->child; 1721 1722 new += 2; 1723 } 1724 *prevp = table; 1725 header->ctl_table_arg = table; 1726 1727 INIT_LIST_HEAD(&header->ctl_entry); 1728 header->used = 0; 1729 header->unregistering = NULL; 1730 header->root = root; 1731 sysctl_set_parent(NULL, header->ctl_table); 1732 if (sysctl_check_table(namespaces, header->ctl_table)) { 1733 kfree(header); 1734 return NULL; 1735 } 1736 spin_lock(&sysctl_lock); 1737 header_list = lookup_header_list(root, namespaces); 1738 list_add_tail(&header->ctl_entry, header_list); 1739 spin_unlock(&sysctl_lock); 1740 1741 return header; 1742 } 1743 1744 /** 1745 * register_sysctl_table_path - register a sysctl table hierarchy 1746 * @path: The path to the directory the sysctl table is in. 1747 * @table: the top-level table structure 1748 * 1749 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1750 * array. A completely 0 filled entry terminates the table. 1751 * 1752 * See __register_sysctl_paths for more details. 1753 */ 1754 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1755 struct ctl_table *table) 1756 { 1757 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1758 path, table); 1759 } 1760 1761 /** 1762 * register_sysctl_table - register a sysctl table hierarchy 1763 * @table: the top-level table structure 1764 * 1765 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1766 * array. A completely 0 filled entry terminates the table. 1767 * 1768 * See register_sysctl_paths for more details. 1769 */ 1770 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 1771 { 1772 static const struct ctl_path null_path[] = { {} }; 1773 1774 return register_sysctl_paths(null_path, table); 1775 } 1776 1777 /** 1778 * unregister_sysctl_table - unregister a sysctl table hierarchy 1779 * @header: the header returned from register_sysctl_table 1780 * 1781 * Unregisters the sysctl table and all children. proc entries may not 1782 * actually be removed until they are no longer used by anyone. 1783 */ 1784 void unregister_sysctl_table(struct ctl_table_header * header) 1785 { 1786 might_sleep(); 1787 1788 if (header == NULL) 1789 return; 1790 1791 spin_lock(&sysctl_lock); 1792 start_unregistering(header); 1793 spin_unlock(&sysctl_lock); 1794 kfree(header); 1795 } 1796 1797 #else /* !CONFIG_SYSCTL */ 1798 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 1799 { 1800 return NULL; 1801 } 1802 1803 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1804 struct ctl_table *table) 1805 { 1806 return NULL; 1807 } 1808 1809 void unregister_sysctl_table(struct ctl_table_header * table) 1810 { 1811 } 1812 1813 #endif /* CONFIG_SYSCTL */ 1814 1815 /* 1816 * /proc/sys support 1817 */ 1818 1819 #ifdef CONFIG_PROC_SYSCTL 1820 1821 static int _proc_do_string(void* data, int maxlen, int write, 1822 struct file *filp, void __user *buffer, 1823 size_t *lenp, loff_t *ppos) 1824 { 1825 size_t len; 1826 char __user *p; 1827 char c; 1828 1829 if (!data || !maxlen || !*lenp) { 1830 *lenp = 0; 1831 return 0; 1832 } 1833 1834 if (write) { 1835 len = 0; 1836 p = buffer; 1837 while (len < *lenp) { 1838 if (get_user(c, p++)) 1839 return -EFAULT; 1840 if (c == 0 || c == '\n') 1841 break; 1842 len++; 1843 } 1844 if (len >= maxlen) 1845 len = maxlen-1; 1846 if(copy_from_user(data, buffer, len)) 1847 return -EFAULT; 1848 ((char *) data)[len] = 0; 1849 *ppos += *lenp; 1850 } else { 1851 len = strlen(data); 1852 if (len > maxlen) 1853 len = maxlen; 1854 1855 if (*ppos > len) { 1856 *lenp = 0; 1857 return 0; 1858 } 1859 1860 data += *ppos; 1861 len -= *ppos; 1862 1863 if (len > *lenp) 1864 len = *lenp; 1865 if (len) 1866 if(copy_to_user(buffer, data, len)) 1867 return -EFAULT; 1868 if (len < *lenp) { 1869 if(put_user('\n', ((char __user *) buffer) + len)) 1870 return -EFAULT; 1871 len++; 1872 } 1873 *lenp = len; 1874 *ppos += len; 1875 } 1876 return 0; 1877 } 1878 1879 /** 1880 * proc_dostring - read a string sysctl 1881 * @table: the sysctl table 1882 * @write: %TRUE if this is a write to the sysctl file 1883 * @filp: the file structure 1884 * @buffer: the user buffer 1885 * @lenp: the size of the user buffer 1886 * @ppos: file position 1887 * 1888 * Reads/writes a string from/to the user buffer. If the kernel 1889 * buffer provided is not large enough to hold the string, the 1890 * string is truncated. The copied string is %NULL-terminated. 1891 * If the string is being read by the user process, it is copied 1892 * and a newline '\n' is added. It is truncated if the buffer is 1893 * not large enough. 1894 * 1895 * Returns 0 on success. 1896 */ 1897 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 1898 void __user *buffer, size_t *lenp, loff_t *ppos) 1899 { 1900 return _proc_do_string(table->data, table->maxlen, write, filp, 1901 buffer, lenp, ppos); 1902 } 1903 1904 1905 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 1906 int *valp, 1907 int write, void *data) 1908 { 1909 if (write) { 1910 *valp = *negp ? -*lvalp : *lvalp; 1911 } else { 1912 int val = *valp; 1913 if (val < 0) { 1914 *negp = -1; 1915 *lvalp = (unsigned long)-val; 1916 } else { 1917 *negp = 0; 1918 *lvalp = (unsigned long)val; 1919 } 1920 } 1921 return 0; 1922 } 1923 1924 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 1925 int write, struct file *filp, void __user *buffer, 1926 size_t *lenp, loff_t *ppos, 1927 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 1928 int write, void *data), 1929 void *data) 1930 { 1931 #define TMPBUFLEN 21 1932 int *i, vleft, first=1, neg, val; 1933 unsigned long lval; 1934 size_t left, len; 1935 1936 char buf[TMPBUFLEN], *p; 1937 char __user *s = buffer; 1938 1939 if (!tbl_data || !table->maxlen || !*lenp || 1940 (*ppos && !write)) { 1941 *lenp = 0; 1942 return 0; 1943 } 1944 1945 i = (int *) tbl_data; 1946 vleft = table->maxlen / sizeof(*i); 1947 left = *lenp; 1948 1949 if (!conv) 1950 conv = do_proc_dointvec_conv; 1951 1952 for (; left && vleft--; i++, first=0) { 1953 if (write) { 1954 while (left) { 1955 char c; 1956 if (get_user(c, s)) 1957 return -EFAULT; 1958 if (!isspace(c)) 1959 break; 1960 left--; 1961 s++; 1962 } 1963 if (!left) 1964 break; 1965 neg = 0; 1966 len = left; 1967 if (len > sizeof(buf) - 1) 1968 len = sizeof(buf) - 1; 1969 if (copy_from_user(buf, s, len)) 1970 return -EFAULT; 1971 buf[len] = 0; 1972 p = buf; 1973 if (*p == '-' && left > 1) { 1974 neg = 1; 1975 p++; 1976 } 1977 if (*p < '0' || *p > '9') 1978 break; 1979 1980 lval = simple_strtoul(p, &p, 0); 1981 1982 len = p-buf; 1983 if ((len < left) && *p && !isspace(*p)) 1984 break; 1985 if (neg) 1986 val = -val; 1987 s += len; 1988 left -= len; 1989 1990 if (conv(&neg, &lval, i, 1, data)) 1991 break; 1992 } else { 1993 p = buf; 1994 if (!first) 1995 *p++ = '\t'; 1996 1997 if (conv(&neg, &lval, i, 0, data)) 1998 break; 1999 2000 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2001 len = strlen(buf); 2002 if (len > left) 2003 len = left; 2004 if(copy_to_user(s, buf, len)) 2005 return -EFAULT; 2006 left -= len; 2007 s += len; 2008 } 2009 } 2010 2011 if (!write && !first && left) { 2012 if(put_user('\n', s)) 2013 return -EFAULT; 2014 left--, s++; 2015 } 2016 if (write) { 2017 while (left) { 2018 char c; 2019 if (get_user(c, s++)) 2020 return -EFAULT; 2021 if (!isspace(c)) 2022 break; 2023 left--; 2024 } 2025 } 2026 if (write && first) 2027 return -EINVAL; 2028 *lenp -= left; 2029 *ppos += *lenp; 2030 return 0; 2031 #undef TMPBUFLEN 2032 } 2033 2034 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2035 void __user *buffer, size_t *lenp, loff_t *ppos, 2036 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2037 int write, void *data), 2038 void *data) 2039 { 2040 return __do_proc_dointvec(table->data, table, write, filp, 2041 buffer, lenp, ppos, conv, data); 2042 } 2043 2044 /** 2045 * proc_dointvec - read a vector of integers 2046 * @table: the sysctl table 2047 * @write: %TRUE if this is a write to the sysctl file 2048 * @filp: the file structure 2049 * @buffer: the user buffer 2050 * @lenp: the size of the user buffer 2051 * @ppos: file position 2052 * 2053 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2054 * values from/to the user buffer, treated as an ASCII string. 2055 * 2056 * Returns 0 on success. 2057 */ 2058 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2059 void __user *buffer, size_t *lenp, loff_t *ppos) 2060 { 2061 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2062 NULL,NULL); 2063 } 2064 2065 #define OP_SET 0 2066 #define OP_AND 1 2067 #define OP_OR 2 2068 2069 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, 2070 int *valp, 2071 int write, void *data) 2072 { 2073 int op = *(int *)data; 2074 if (write) { 2075 int val = *negp ? -*lvalp : *lvalp; 2076 switch(op) { 2077 case OP_SET: *valp = val; break; 2078 case OP_AND: *valp &= val; break; 2079 case OP_OR: *valp |= val; break; 2080 } 2081 } else { 2082 int val = *valp; 2083 if (val < 0) { 2084 *negp = -1; 2085 *lvalp = (unsigned long)-val; 2086 } else { 2087 *negp = 0; 2088 *lvalp = (unsigned long)val; 2089 } 2090 } 2091 return 0; 2092 } 2093 2094 #ifdef CONFIG_SECURITY_CAPABILITIES 2095 /* 2096 * init may raise the set. 2097 */ 2098 2099 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp, 2100 void __user *buffer, size_t *lenp, loff_t *ppos) 2101 { 2102 int op; 2103 2104 if (write && !capable(CAP_SYS_MODULE)) { 2105 return -EPERM; 2106 } 2107 2108 op = is_global_init(current) ? OP_SET : OP_AND; 2109 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2110 do_proc_dointvec_bset_conv,&op); 2111 } 2112 #endif /* def CONFIG_SECURITY_CAPABILITIES */ 2113 2114 /* 2115 * Taint values can only be increased 2116 */ 2117 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp, 2118 void __user *buffer, size_t *lenp, loff_t *ppos) 2119 { 2120 int op; 2121 2122 if (write && !capable(CAP_SYS_ADMIN)) 2123 return -EPERM; 2124 2125 op = OP_OR; 2126 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2127 do_proc_dointvec_bset_conv,&op); 2128 } 2129 2130 struct do_proc_dointvec_minmax_conv_param { 2131 int *min; 2132 int *max; 2133 }; 2134 2135 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2136 int *valp, 2137 int write, void *data) 2138 { 2139 struct do_proc_dointvec_minmax_conv_param *param = data; 2140 if (write) { 2141 int val = *negp ? -*lvalp : *lvalp; 2142 if ((param->min && *param->min > val) || 2143 (param->max && *param->max < val)) 2144 return -EINVAL; 2145 *valp = val; 2146 } else { 2147 int val = *valp; 2148 if (val < 0) { 2149 *negp = -1; 2150 *lvalp = (unsigned long)-val; 2151 } else { 2152 *negp = 0; 2153 *lvalp = (unsigned long)val; 2154 } 2155 } 2156 return 0; 2157 } 2158 2159 /** 2160 * proc_dointvec_minmax - read a vector of integers with min/max values 2161 * @table: the sysctl table 2162 * @write: %TRUE if this is a write to the sysctl file 2163 * @filp: the file structure 2164 * @buffer: the user buffer 2165 * @lenp: the size of the user buffer 2166 * @ppos: file position 2167 * 2168 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2169 * values from/to the user buffer, treated as an ASCII string. 2170 * 2171 * This routine will ensure the values are within the range specified by 2172 * table->extra1 (min) and table->extra2 (max). 2173 * 2174 * Returns 0 on success. 2175 */ 2176 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2177 void __user *buffer, size_t *lenp, loff_t *ppos) 2178 { 2179 struct do_proc_dointvec_minmax_conv_param param = { 2180 .min = (int *) table->extra1, 2181 .max = (int *) table->extra2, 2182 }; 2183 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2184 do_proc_dointvec_minmax_conv, ¶m); 2185 } 2186 2187 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2188 struct file *filp, 2189 void __user *buffer, 2190 size_t *lenp, loff_t *ppos, 2191 unsigned long convmul, 2192 unsigned long convdiv) 2193 { 2194 #define TMPBUFLEN 21 2195 unsigned long *i, *min, *max, val; 2196 int vleft, first=1, neg; 2197 size_t len, left; 2198 char buf[TMPBUFLEN], *p; 2199 char __user *s = buffer; 2200 2201 if (!data || !table->maxlen || !*lenp || 2202 (*ppos && !write)) { 2203 *lenp = 0; 2204 return 0; 2205 } 2206 2207 i = (unsigned long *) data; 2208 min = (unsigned long *) table->extra1; 2209 max = (unsigned long *) table->extra2; 2210 vleft = table->maxlen / sizeof(unsigned long); 2211 left = *lenp; 2212 2213 for (; left && vleft--; i++, min++, max++, first=0) { 2214 if (write) { 2215 while (left) { 2216 char c; 2217 if (get_user(c, s)) 2218 return -EFAULT; 2219 if (!isspace(c)) 2220 break; 2221 left--; 2222 s++; 2223 } 2224 if (!left) 2225 break; 2226 neg = 0; 2227 len = left; 2228 if (len > TMPBUFLEN-1) 2229 len = TMPBUFLEN-1; 2230 if (copy_from_user(buf, s, len)) 2231 return -EFAULT; 2232 buf[len] = 0; 2233 p = buf; 2234 if (*p == '-' && left > 1) { 2235 neg = 1; 2236 p++; 2237 } 2238 if (*p < '0' || *p > '9') 2239 break; 2240 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2241 len = p-buf; 2242 if ((len < left) && *p && !isspace(*p)) 2243 break; 2244 if (neg) 2245 val = -val; 2246 s += len; 2247 left -= len; 2248 2249 if(neg) 2250 continue; 2251 if ((min && val < *min) || (max && val > *max)) 2252 continue; 2253 *i = val; 2254 } else { 2255 p = buf; 2256 if (!first) 2257 *p++ = '\t'; 2258 sprintf(p, "%lu", convdiv * (*i) / convmul); 2259 len = strlen(buf); 2260 if (len > left) 2261 len = left; 2262 if(copy_to_user(s, buf, len)) 2263 return -EFAULT; 2264 left -= len; 2265 s += len; 2266 } 2267 } 2268 2269 if (!write && !first && left) { 2270 if(put_user('\n', s)) 2271 return -EFAULT; 2272 left--, s++; 2273 } 2274 if (write) { 2275 while (left) { 2276 char c; 2277 if (get_user(c, s++)) 2278 return -EFAULT; 2279 if (!isspace(c)) 2280 break; 2281 left--; 2282 } 2283 } 2284 if (write && first) 2285 return -EINVAL; 2286 *lenp -= left; 2287 *ppos += *lenp; 2288 return 0; 2289 #undef TMPBUFLEN 2290 } 2291 2292 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2293 struct file *filp, 2294 void __user *buffer, 2295 size_t *lenp, loff_t *ppos, 2296 unsigned long convmul, 2297 unsigned long convdiv) 2298 { 2299 return __do_proc_doulongvec_minmax(table->data, table, write, 2300 filp, buffer, lenp, ppos, convmul, convdiv); 2301 } 2302 2303 /** 2304 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2305 * @table: the sysctl table 2306 * @write: %TRUE if this is a write to the sysctl file 2307 * @filp: the file structure 2308 * @buffer: the user buffer 2309 * @lenp: the size of the user buffer 2310 * @ppos: file position 2311 * 2312 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2313 * values from/to the user buffer, treated as an ASCII string. 2314 * 2315 * This routine will ensure the values are within the range specified by 2316 * table->extra1 (min) and table->extra2 (max). 2317 * 2318 * Returns 0 on success. 2319 */ 2320 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2321 void __user *buffer, size_t *lenp, loff_t *ppos) 2322 { 2323 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2324 } 2325 2326 /** 2327 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2328 * @table: the sysctl table 2329 * @write: %TRUE if this is a write to the sysctl file 2330 * @filp: the file structure 2331 * @buffer: the user buffer 2332 * @lenp: the size of the user buffer 2333 * @ppos: file position 2334 * 2335 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2336 * values from/to the user buffer, treated as an ASCII string. The values 2337 * are treated as milliseconds, and converted to jiffies when they are stored. 2338 * 2339 * This routine will ensure the values are within the range specified by 2340 * table->extra1 (min) and table->extra2 (max). 2341 * 2342 * Returns 0 on success. 2343 */ 2344 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2345 struct file *filp, 2346 void __user *buffer, 2347 size_t *lenp, loff_t *ppos) 2348 { 2349 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2350 lenp, ppos, HZ, 1000l); 2351 } 2352 2353 2354 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2355 int *valp, 2356 int write, void *data) 2357 { 2358 if (write) { 2359 if (*lvalp > LONG_MAX / HZ) 2360 return 1; 2361 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2362 } else { 2363 int val = *valp; 2364 unsigned long lval; 2365 if (val < 0) { 2366 *negp = -1; 2367 lval = (unsigned long)-val; 2368 } else { 2369 *negp = 0; 2370 lval = (unsigned long)val; 2371 } 2372 *lvalp = lval / HZ; 2373 } 2374 return 0; 2375 } 2376 2377 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2378 int *valp, 2379 int write, void *data) 2380 { 2381 if (write) { 2382 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2383 return 1; 2384 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2385 } else { 2386 int val = *valp; 2387 unsigned long lval; 2388 if (val < 0) { 2389 *negp = -1; 2390 lval = (unsigned long)-val; 2391 } else { 2392 *negp = 0; 2393 lval = (unsigned long)val; 2394 } 2395 *lvalp = jiffies_to_clock_t(lval); 2396 } 2397 return 0; 2398 } 2399 2400 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2401 int *valp, 2402 int write, void *data) 2403 { 2404 if (write) { 2405 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2406 } else { 2407 int val = *valp; 2408 unsigned long lval; 2409 if (val < 0) { 2410 *negp = -1; 2411 lval = (unsigned long)-val; 2412 } else { 2413 *negp = 0; 2414 lval = (unsigned long)val; 2415 } 2416 *lvalp = jiffies_to_msecs(lval); 2417 } 2418 return 0; 2419 } 2420 2421 /** 2422 * proc_dointvec_jiffies - read a vector of integers as seconds 2423 * @table: the sysctl table 2424 * @write: %TRUE if this is a write to the sysctl file 2425 * @filp: the file structure 2426 * @buffer: the user buffer 2427 * @lenp: the size of the user buffer 2428 * @ppos: file position 2429 * 2430 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2431 * values from/to the user buffer, treated as an ASCII string. 2432 * The values read are assumed to be in seconds, and are converted into 2433 * jiffies. 2434 * 2435 * Returns 0 on success. 2436 */ 2437 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2438 void __user *buffer, size_t *lenp, loff_t *ppos) 2439 { 2440 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2441 do_proc_dointvec_jiffies_conv,NULL); 2442 } 2443 2444 /** 2445 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2446 * @table: the sysctl table 2447 * @write: %TRUE if this is a write to the sysctl file 2448 * @filp: the file structure 2449 * @buffer: the user buffer 2450 * @lenp: the size of the user buffer 2451 * @ppos: pointer to the file position 2452 * 2453 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2454 * values from/to the user buffer, treated as an ASCII string. 2455 * The values read are assumed to be in 1/USER_HZ seconds, and 2456 * are converted into jiffies. 2457 * 2458 * Returns 0 on success. 2459 */ 2460 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2461 void __user *buffer, size_t *lenp, loff_t *ppos) 2462 { 2463 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2464 do_proc_dointvec_userhz_jiffies_conv,NULL); 2465 } 2466 2467 /** 2468 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2469 * @table: the sysctl table 2470 * @write: %TRUE if this is a write to the sysctl file 2471 * @filp: the file structure 2472 * @buffer: the user buffer 2473 * @lenp: the size of the user buffer 2474 * @ppos: file position 2475 * @ppos: the current position in the file 2476 * 2477 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2478 * values from/to the user buffer, treated as an ASCII string. 2479 * The values read are assumed to be in 1/1000 seconds, and 2480 * are converted into jiffies. 2481 * 2482 * Returns 0 on success. 2483 */ 2484 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2485 void __user *buffer, size_t *lenp, loff_t *ppos) 2486 { 2487 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2488 do_proc_dointvec_ms_jiffies_conv, NULL); 2489 } 2490 2491 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 2492 void __user *buffer, size_t *lenp, loff_t *ppos) 2493 { 2494 struct pid *new_pid; 2495 pid_t tmp; 2496 int r; 2497 2498 tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns); 2499 2500 r = __do_proc_dointvec(&tmp, table, write, filp, buffer, 2501 lenp, ppos, NULL, NULL); 2502 if (r || !write) 2503 return r; 2504 2505 new_pid = find_get_pid(tmp); 2506 if (!new_pid) 2507 return -ESRCH; 2508 2509 put_pid(xchg(&cad_pid, new_pid)); 2510 return 0; 2511 } 2512 2513 #else /* CONFIG_PROC_FS */ 2514 2515 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2516 void __user *buffer, size_t *lenp, loff_t *ppos) 2517 { 2518 return -ENOSYS; 2519 } 2520 2521 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2522 void __user *buffer, size_t *lenp, loff_t *ppos) 2523 { 2524 return -ENOSYS; 2525 } 2526 2527 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp, 2528 void __user *buffer, size_t *lenp, loff_t *ppos) 2529 { 2530 return -ENOSYS; 2531 } 2532 2533 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2534 void __user *buffer, size_t *lenp, loff_t *ppos) 2535 { 2536 return -ENOSYS; 2537 } 2538 2539 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2540 void __user *buffer, size_t *lenp, loff_t *ppos) 2541 { 2542 return -ENOSYS; 2543 } 2544 2545 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2546 void __user *buffer, size_t *lenp, loff_t *ppos) 2547 { 2548 return -ENOSYS; 2549 } 2550 2551 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2552 void __user *buffer, size_t *lenp, loff_t *ppos) 2553 { 2554 return -ENOSYS; 2555 } 2556 2557 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2558 void __user *buffer, size_t *lenp, loff_t *ppos) 2559 { 2560 return -ENOSYS; 2561 } 2562 2563 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2564 struct file *filp, 2565 void __user *buffer, 2566 size_t *lenp, loff_t *ppos) 2567 { 2568 return -ENOSYS; 2569 } 2570 2571 2572 #endif /* CONFIG_PROC_FS */ 2573 2574 2575 #ifdef CONFIG_SYSCTL_SYSCALL 2576 /* 2577 * General sysctl support routines 2578 */ 2579 2580 /* The generic sysctl data routine (used if no strategy routine supplied) */ 2581 int sysctl_data(struct ctl_table *table, int __user *name, int nlen, 2582 void __user *oldval, size_t __user *oldlenp, 2583 void __user *newval, size_t newlen) 2584 { 2585 size_t len; 2586 2587 /* Get out of I don't have a variable */ 2588 if (!table->data || !table->maxlen) 2589 return -ENOTDIR; 2590 2591 if (oldval && oldlenp) { 2592 if (get_user(len, oldlenp)) 2593 return -EFAULT; 2594 if (len) { 2595 if (len > table->maxlen) 2596 len = table->maxlen; 2597 if (copy_to_user(oldval, table->data, len)) 2598 return -EFAULT; 2599 if (put_user(len, oldlenp)) 2600 return -EFAULT; 2601 } 2602 } 2603 2604 if (newval && newlen) { 2605 if (newlen > table->maxlen) 2606 newlen = table->maxlen; 2607 2608 if (copy_from_user(table->data, newval, newlen)) 2609 return -EFAULT; 2610 } 2611 return 1; 2612 } 2613 2614 /* The generic string strategy routine: */ 2615 int sysctl_string(struct ctl_table *table, int __user *name, int nlen, 2616 void __user *oldval, size_t __user *oldlenp, 2617 void __user *newval, size_t newlen) 2618 { 2619 if (!table->data || !table->maxlen) 2620 return -ENOTDIR; 2621 2622 if (oldval && oldlenp) { 2623 size_t bufsize; 2624 if (get_user(bufsize, oldlenp)) 2625 return -EFAULT; 2626 if (bufsize) { 2627 size_t len = strlen(table->data), copied; 2628 2629 /* This shouldn't trigger for a well-formed sysctl */ 2630 if (len > table->maxlen) 2631 len = table->maxlen; 2632 2633 /* Copy up to a max of bufsize-1 bytes of the string */ 2634 copied = (len >= bufsize) ? bufsize - 1 : len; 2635 2636 if (copy_to_user(oldval, table->data, copied) || 2637 put_user(0, (char __user *)(oldval + copied))) 2638 return -EFAULT; 2639 if (put_user(len, oldlenp)) 2640 return -EFAULT; 2641 } 2642 } 2643 if (newval && newlen) { 2644 size_t len = newlen; 2645 if (len > table->maxlen) 2646 len = table->maxlen; 2647 if(copy_from_user(table->data, newval, len)) 2648 return -EFAULT; 2649 if (len == table->maxlen) 2650 len--; 2651 ((char *) table->data)[len] = 0; 2652 } 2653 return 1; 2654 } 2655 2656 /* 2657 * This function makes sure that all of the integers in the vector 2658 * are between the minimum and maximum values given in the arrays 2659 * table->extra1 and table->extra2, respectively. 2660 */ 2661 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, 2662 void __user *oldval, size_t __user *oldlenp, 2663 void __user *newval, size_t newlen) 2664 { 2665 2666 if (newval && newlen) { 2667 int __user *vec = (int __user *) newval; 2668 int *min = (int *) table->extra1; 2669 int *max = (int *) table->extra2; 2670 size_t length; 2671 int i; 2672 2673 if (newlen % sizeof(int) != 0) 2674 return -EINVAL; 2675 2676 if (!table->extra1 && !table->extra2) 2677 return 0; 2678 2679 if (newlen > table->maxlen) 2680 newlen = table->maxlen; 2681 length = newlen / sizeof(int); 2682 2683 for (i = 0; i < length; i++) { 2684 int value; 2685 if (get_user(value, vec + i)) 2686 return -EFAULT; 2687 if (min && value < min[i]) 2688 return -EINVAL; 2689 if (max && value > max[i]) 2690 return -EINVAL; 2691 } 2692 } 2693 return 0; 2694 } 2695 2696 /* Strategy function to convert jiffies to seconds */ 2697 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, 2698 void __user *oldval, size_t __user *oldlenp, 2699 void __user *newval, size_t newlen) 2700 { 2701 if (oldval && oldlenp) { 2702 size_t olen; 2703 2704 if (get_user(olen, oldlenp)) 2705 return -EFAULT; 2706 if (olen) { 2707 int val; 2708 2709 if (olen < sizeof(int)) 2710 return -EINVAL; 2711 2712 val = *(int *)(table->data) / HZ; 2713 if (put_user(val, (int __user *)oldval)) 2714 return -EFAULT; 2715 if (put_user(sizeof(int), oldlenp)) 2716 return -EFAULT; 2717 } 2718 } 2719 if (newval && newlen) { 2720 int new; 2721 if (newlen != sizeof(int)) 2722 return -EINVAL; 2723 if (get_user(new, (int __user *)newval)) 2724 return -EFAULT; 2725 *(int *)(table->data) = new*HZ; 2726 } 2727 return 1; 2728 } 2729 2730 /* Strategy function to convert jiffies to seconds */ 2731 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, 2732 void __user *oldval, size_t __user *oldlenp, 2733 void __user *newval, size_t newlen) 2734 { 2735 if (oldval && oldlenp) { 2736 size_t olen; 2737 2738 if (get_user(olen, oldlenp)) 2739 return -EFAULT; 2740 if (olen) { 2741 int val; 2742 2743 if (olen < sizeof(int)) 2744 return -EINVAL; 2745 2746 val = jiffies_to_msecs(*(int *)(table->data)); 2747 if (put_user(val, (int __user *)oldval)) 2748 return -EFAULT; 2749 if (put_user(sizeof(int), oldlenp)) 2750 return -EFAULT; 2751 } 2752 } 2753 if (newval && newlen) { 2754 int new; 2755 if (newlen != sizeof(int)) 2756 return -EINVAL; 2757 if (get_user(new, (int __user *)newval)) 2758 return -EFAULT; 2759 *(int *)(table->data) = msecs_to_jiffies(new); 2760 } 2761 return 1; 2762 } 2763 2764 2765 2766 #else /* CONFIG_SYSCTL_SYSCALL */ 2767 2768 2769 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 2770 { 2771 struct __sysctl_args tmp; 2772 int error; 2773 2774 if (copy_from_user(&tmp, args, sizeof(tmp))) 2775 return -EFAULT; 2776 2777 error = deprecated_sysctl_warning(&tmp); 2778 2779 /* If no error reading the parameters then just -ENOSYS ... */ 2780 if (!error) 2781 error = -ENOSYS; 2782 2783 return error; 2784 } 2785 2786 int sysctl_data(struct ctl_table *table, int __user *name, int nlen, 2787 void __user *oldval, size_t __user *oldlenp, 2788 void __user *newval, size_t newlen) 2789 { 2790 return -ENOSYS; 2791 } 2792 2793 int sysctl_string(struct ctl_table *table, int __user *name, int nlen, 2794 void __user *oldval, size_t __user *oldlenp, 2795 void __user *newval, size_t newlen) 2796 { 2797 return -ENOSYS; 2798 } 2799 2800 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen, 2801 void __user *oldval, size_t __user *oldlenp, 2802 void __user *newval, size_t newlen) 2803 { 2804 return -ENOSYS; 2805 } 2806 2807 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen, 2808 void __user *oldval, size_t __user *oldlenp, 2809 void __user *newval, size_t newlen) 2810 { 2811 return -ENOSYS; 2812 } 2813 2814 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen, 2815 void __user *oldval, size_t __user *oldlenp, 2816 void __user *newval, size_t newlen) 2817 { 2818 return -ENOSYS; 2819 } 2820 2821 #endif /* CONFIG_SYSCTL_SYSCALL */ 2822 2823 static int deprecated_sysctl_warning(struct __sysctl_args *args) 2824 { 2825 static int msg_count; 2826 int name[CTL_MAXNAME]; 2827 int i; 2828 2829 /* Check args->nlen. */ 2830 if (args->nlen < 0 || args->nlen > CTL_MAXNAME) 2831 return -ENOTDIR; 2832 2833 /* Read in the sysctl name for better debug message logging */ 2834 for (i = 0; i < args->nlen; i++) 2835 if (get_user(name[i], args->name + i)) 2836 return -EFAULT; 2837 2838 /* Ignore accesses to kernel.version */ 2839 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) 2840 return 0; 2841 2842 if (msg_count < 5) { 2843 msg_count++; 2844 printk(KERN_INFO 2845 "warning: process `%s' used the deprecated sysctl " 2846 "system call with ", current->comm); 2847 for (i = 0; i < args->nlen; i++) 2848 printk("%d.", name[i]); 2849 printk("\n"); 2850 } 2851 return 0; 2852 } 2853 2854 /* 2855 * No sense putting this after each symbol definition, twice, 2856 * exception granted :-) 2857 */ 2858 EXPORT_SYMBOL(proc_dointvec); 2859 EXPORT_SYMBOL(proc_dointvec_jiffies); 2860 EXPORT_SYMBOL(proc_dointvec_minmax); 2861 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2862 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2863 EXPORT_SYMBOL(proc_dostring); 2864 EXPORT_SYMBOL(proc_doulongvec_minmax); 2865 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2866 EXPORT_SYMBOL(register_sysctl_table); 2867 EXPORT_SYMBOL(register_sysctl_paths); 2868 EXPORT_SYMBOL(sysctl_intvec); 2869 EXPORT_SYMBOL(sysctl_jiffies); 2870 EXPORT_SYMBOL(sysctl_ms_jiffies); 2871 EXPORT_SYMBOL(sysctl_string); 2872 EXPORT_SYMBOL(sysctl_data); 2873 EXPORT_SYMBOL(unregister_sysctl_table); 2874