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/initrd.h> 41 #include <linux/key.h> 42 #include <linux/times.h> 43 #include <linux/limits.h> 44 #include <linux/dcache.h> 45 #include <linux/syscalls.h> 46 #include <linux/vmstat.h> 47 #include <linux/nfs_fs.h> 48 #include <linux/acpi.h> 49 #include <linux/reboot.h> 50 #include <linux/ftrace.h> 51 52 #include <asm/uaccess.h> 53 #include <asm/processor.h> 54 55 #ifdef CONFIG_X86 56 #include <asm/nmi.h> 57 #include <asm/stacktrace.h> 58 #include <asm/io.h> 59 #endif 60 61 static int deprecated_sysctl_warning(struct __sysctl_args *args); 62 63 #if defined(CONFIG_SYSCTL) 64 65 /* External variables not in a header file. */ 66 extern int C_A_D; 67 extern int print_fatal_signals; 68 extern int sysctl_overcommit_memory; 69 extern int sysctl_overcommit_ratio; 70 extern int sysctl_panic_on_oom; 71 extern int sysctl_oom_kill_allocating_task; 72 extern int sysctl_oom_dump_tasks; 73 extern int max_threads; 74 extern int core_uses_pid; 75 extern int suid_dumpable; 76 extern char core_pattern[]; 77 extern int pid_max; 78 extern int min_free_kbytes; 79 extern int pid_max_min, pid_max_max; 80 extern int sysctl_drop_caches; 81 extern int percpu_pagelist_fraction; 82 extern int compat_log; 83 extern int latencytop_enabled; 84 extern int sysctl_nr_open_min, sysctl_nr_open_max; 85 #ifndef CONFIG_MMU 86 extern int sysctl_nr_trim_pages; 87 #endif 88 #ifdef CONFIG_RCU_TORTURE_TEST 89 extern int rcutorture_runnable; 90 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */ 91 92 /* Constants used for minimum and maximum */ 93 #ifdef CONFIG_DETECT_SOFTLOCKUP 94 static int sixty = 60; 95 static int neg_one = -1; 96 #endif 97 98 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING) 99 static int two = 2; 100 #endif 101 102 static int zero; 103 static int one = 1; 104 static int one_hundred = 100; 105 106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 107 static int maxolduid = 65535; 108 static int minolduid; 109 static int min_percpu_pagelist_fract = 8; 110 111 static int ngroups_max = NGROUPS_MAX; 112 113 #ifdef CONFIG_MODULES 114 extern char modprobe_path[]; 115 #endif 116 #ifdef CONFIG_CHR_DEV_SG 117 extern int sg_big_buff; 118 #endif 119 120 #ifdef CONFIG_SPARC 121 #include <asm/system.h> 122 #endif 123 124 #ifdef CONFIG_SPARC64 125 extern int sysctl_tsb_ratio; 126 #endif 127 128 #ifdef __hppa__ 129 extern int pwrsw_enabled; 130 extern int unaligned_enabled; 131 #endif 132 133 #ifdef CONFIG_S390 134 #ifdef CONFIG_MATHEMU 135 extern int sysctl_ieee_emulation_warnings; 136 #endif 137 extern int sysctl_userprocess_debug; 138 extern int spin_retry; 139 #endif 140 141 #ifdef CONFIG_BSD_PROCESS_ACCT 142 extern int acct_parm[]; 143 #endif 144 145 #ifdef CONFIG_IA64 146 extern int no_unaligned_warning; 147 extern int unaligned_dump_stack; 148 #endif 149 150 #ifdef CONFIG_RT_MUTEXES 151 extern int max_lock_depth; 152 #endif 153 154 #ifdef CONFIG_PROC_SYSCTL 155 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 156 void __user *buffer, size_t *lenp, loff_t *ppos); 157 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 158 void __user *buffer, size_t *lenp, loff_t *ppos); 159 #endif 160 161 static struct ctl_table root_table[]; 162 static struct ctl_table_root sysctl_table_root; 163 static struct ctl_table_header root_table_header = { 164 .count = 1, 165 .ctl_table = root_table, 166 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list), 167 .root = &sysctl_table_root, 168 .set = &sysctl_table_root.default_set, 169 }; 170 static struct ctl_table_root sysctl_table_root = { 171 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list), 172 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry), 173 }; 174 175 static struct ctl_table kern_table[]; 176 static struct ctl_table vm_table[]; 177 static struct ctl_table fs_table[]; 178 static struct ctl_table debug_table[]; 179 static struct ctl_table dev_table[]; 180 extern struct ctl_table random_table[]; 181 #ifdef CONFIG_INOTIFY_USER 182 extern struct ctl_table inotify_table[]; 183 #endif 184 #ifdef CONFIG_EPOLL 185 extern struct ctl_table epoll_table[]; 186 #endif 187 188 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 189 int sysctl_legacy_va_layout; 190 #endif 191 192 extern int prove_locking; 193 extern int lock_stat; 194 195 /* The default sysctl tables: */ 196 197 static struct ctl_table root_table[] = { 198 { 199 .ctl_name = CTL_KERN, 200 .procname = "kernel", 201 .mode = 0555, 202 .child = kern_table, 203 }, 204 { 205 .ctl_name = CTL_VM, 206 .procname = "vm", 207 .mode = 0555, 208 .child = vm_table, 209 }, 210 { 211 .ctl_name = CTL_FS, 212 .procname = "fs", 213 .mode = 0555, 214 .child = fs_table, 215 }, 216 { 217 .ctl_name = CTL_DEBUG, 218 .procname = "debug", 219 .mode = 0555, 220 .child = debug_table, 221 }, 222 { 223 .ctl_name = CTL_DEV, 224 .procname = "dev", 225 .mode = 0555, 226 .child = dev_table, 227 }, 228 /* 229 * NOTE: do not add new entries to this table unless you have read 230 * Documentation/sysctl/ctl_unnumbered.txt 231 */ 232 { .ctl_name = 0 } 233 }; 234 235 #ifdef CONFIG_SCHED_DEBUG 236 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 237 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 238 static int min_wakeup_granularity_ns; /* 0 usecs */ 239 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 240 #endif 241 242 static struct ctl_table kern_table[] = { 243 #ifdef CONFIG_SCHED_DEBUG 244 { 245 .ctl_name = CTL_UNNUMBERED, 246 .procname = "sched_min_granularity_ns", 247 .data = &sysctl_sched_min_granularity, 248 .maxlen = sizeof(unsigned int), 249 .mode = 0644, 250 .proc_handler = &sched_nr_latency_handler, 251 .strategy = &sysctl_intvec, 252 .extra1 = &min_sched_granularity_ns, 253 .extra2 = &max_sched_granularity_ns, 254 }, 255 { 256 .ctl_name = CTL_UNNUMBERED, 257 .procname = "sched_latency_ns", 258 .data = &sysctl_sched_latency, 259 .maxlen = sizeof(unsigned int), 260 .mode = 0644, 261 .proc_handler = &sched_nr_latency_handler, 262 .strategy = &sysctl_intvec, 263 .extra1 = &min_sched_granularity_ns, 264 .extra2 = &max_sched_granularity_ns, 265 }, 266 { 267 .ctl_name = CTL_UNNUMBERED, 268 .procname = "sched_wakeup_granularity_ns", 269 .data = &sysctl_sched_wakeup_granularity, 270 .maxlen = sizeof(unsigned int), 271 .mode = 0644, 272 .proc_handler = &proc_dointvec_minmax, 273 .strategy = &sysctl_intvec, 274 .extra1 = &min_wakeup_granularity_ns, 275 .extra2 = &max_wakeup_granularity_ns, 276 }, 277 { 278 .ctl_name = CTL_UNNUMBERED, 279 .procname = "sched_shares_ratelimit", 280 .data = &sysctl_sched_shares_ratelimit, 281 .maxlen = sizeof(unsigned int), 282 .mode = 0644, 283 .proc_handler = &proc_dointvec, 284 }, 285 { 286 .ctl_name = CTL_UNNUMBERED, 287 .procname = "sched_shares_thresh", 288 .data = &sysctl_sched_shares_thresh, 289 .maxlen = sizeof(unsigned int), 290 .mode = 0644, 291 .proc_handler = &proc_dointvec_minmax, 292 .strategy = &sysctl_intvec, 293 .extra1 = &zero, 294 }, 295 { 296 .ctl_name = CTL_UNNUMBERED, 297 .procname = "sched_child_runs_first", 298 .data = &sysctl_sched_child_runs_first, 299 .maxlen = sizeof(unsigned int), 300 .mode = 0644, 301 .proc_handler = &proc_dointvec, 302 }, 303 { 304 .ctl_name = CTL_UNNUMBERED, 305 .procname = "sched_features", 306 .data = &sysctl_sched_features, 307 .maxlen = sizeof(unsigned int), 308 .mode = 0644, 309 .proc_handler = &proc_dointvec, 310 }, 311 { 312 .ctl_name = CTL_UNNUMBERED, 313 .procname = "sched_migration_cost", 314 .data = &sysctl_sched_migration_cost, 315 .maxlen = sizeof(unsigned int), 316 .mode = 0644, 317 .proc_handler = &proc_dointvec, 318 }, 319 { 320 .ctl_name = CTL_UNNUMBERED, 321 .procname = "sched_nr_migrate", 322 .data = &sysctl_sched_nr_migrate, 323 .maxlen = sizeof(unsigned int), 324 .mode = 0644, 325 .proc_handler = &proc_dointvec, 326 }, 327 #endif 328 { 329 .ctl_name = CTL_UNNUMBERED, 330 .procname = "sched_rt_period_us", 331 .data = &sysctl_sched_rt_period, 332 .maxlen = sizeof(unsigned int), 333 .mode = 0644, 334 .proc_handler = &sched_rt_handler, 335 }, 336 { 337 .ctl_name = CTL_UNNUMBERED, 338 .procname = "sched_rt_runtime_us", 339 .data = &sysctl_sched_rt_runtime, 340 .maxlen = sizeof(int), 341 .mode = 0644, 342 .proc_handler = &sched_rt_handler, 343 }, 344 { 345 .ctl_name = CTL_UNNUMBERED, 346 .procname = "sched_compat_yield", 347 .data = &sysctl_sched_compat_yield, 348 .maxlen = sizeof(unsigned int), 349 .mode = 0644, 350 .proc_handler = &proc_dointvec, 351 }, 352 #ifdef CONFIG_PROVE_LOCKING 353 { 354 .ctl_name = CTL_UNNUMBERED, 355 .procname = "prove_locking", 356 .data = &prove_locking, 357 .maxlen = sizeof(int), 358 .mode = 0644, 359 .proc_handler = &proc_dointvec, 360 }, 361 #endif 362 #ifdef CONFIG_LOCK_STAT 363 { 364 .ctl_name = CTL_UNNUMBERED, 365 .procname = "lock_stat", 366 .data = &lock_stat, 367 .maxlen = sizeof(int), 368 .mode = 0644, 369 .proc_handler = &proc_dointvec, 370 }, 371 #endif 372 { 373 .ctl_name = KERN_PANIC, 374 .procname = "panic", 375 .data = &panic_timeout, 376 .maxlen = sizeof(int), 377 .mode = 0644, 378 .proc_handler = &proc_dointvec, 379 }, 380 { 381 .ctl_name = KERN_CORE_USES_PID, 382 .procname = "core_uses_pid", 383 .data = &core_uses_pid, 384 .maxlen = sizeof(int), 385 .mode = 0644, 386 .proc_handler = &proc_dointvec, 387 }, 388 { 389 .ctl_name = KERN_CORE_PATTERN, 390 .procname = "core_pattern", 391 .data = core_pattern, 392 .maxlen = CORENAME_MAX_SIZE, 393 .mode = 0644, 394 .proc_handler = &proc_dostring, 395 .strategy = &sysctl_string, 396 }, 397 #ifdef CONFIG_PROC_SYSCTL 398 { 399 .procname = "tainted", 400 .maxlen = sizeof(long), 401 .mode = 0644, 402 .proc_handler = &proc_taint, 403 }, 404 #endif 405 #ifdef CONFIG_LATENCYTOP 406 { 407 .procname = "latencytop", 408 .data = &latencytop_enabled, 409 .maxlen = sizeof(int), 410 .mode = 0644, 411 .proc_handler = &proc_dointvec, 412 }, 413 #endif 414 #ifdef CONFIG_BLK_DEV_INITRD 415 { 416 .ctl_name = KERN_REALROOTDEV, 417 .procname = "real-root-dev", 418 .data = &real_root_dev, 419 .maxlen = sizeof(int), 420 .mode = 0644, 421 .proc_handler = &proc_dointvec, 422 }, 423 #endif 424 { 425 .ctl_name = CTL_UNNUMBERED, 426 .procname = "print-fatal-signals", 427 .data = &print_fatal_signals, 428 .maxlen = sizeof(int), 429 .mode = 0644, 430 .proc_handler = &proc_dointvec, 431 }, 432 #ifdef CONFIG_SPARC 433 { 434 .ctl_name = KERN_SPARC_REBOOT, 435 .procname = "reboot-cmd", 436 .data = reboot_command, 437 .maxlen = 256, 438 .mode = 0644, 439 .proc_handler = &proc_dostring, 440 .strategy = &sysctl_string, 441 }, 442 { 443 .ctl_name = KERN_SPARC_STOP_A, 444 .procname = "stop-a", 445 .data = &stop_a_enabled, 446 .maxlen = sizeof (int), 447 .mode = 0644, 448 .proc_handler = &proc_dointvec, 449 }, 450 { 451 .ctl_name = KERN_SPARC_SCONS_PWROFF, 452 .procname = "scons-poweroff", 453 .data = &scons_pwroff, 454 .maxlen = sizeof (int), 455 .mode = 0644, 456 .proc_handler = &proc_dointvec, 457 }, 458 #endif 459 #ifdef CONFIG_SPARC64 460 { 461 .ctl_name = CTL_UNNUMBERED, 462 .procname = "tsb-ratio", 463 .data = &sysctl_tsb_ratio, 464 .maxlen = sizeof (int), 465 .mode = 0644, 466 .proc_handler = &proc_dointvec, 467 }, 468 #endif 469 #ifdef __hppa__ 470 { 471 .ctl_name = KERN_HPPA_PWRSW, 472 .procname = "soft-power", 473 .data = &pwrsw_enabled, 474 .maxlen = sizeof (int), 475 .mode = 0644, 476 .proc_handler = &proc_dointvec, 477 }, 478 { 479 .ctl_name = KERN_HPPA_UNALIGNED, 480 .procname = "unaligned-trap", 481 .data = &unaligned_enabled, 482 .maxlen = sizeof (int), 483 .mode = 0644, 484 .proc_handler = &proc_dointvec, 485 }, 486 #endif 487 { 488 .ctl_name = KERN_CTLALTDEL, 489 .procname = "ctrl-alt-del", 490 .data = &C_A_D, 491 .maxlen = sizeof(int), 492 .mode = 0644, 493 .proc_handler = &proc_dointvec, 494 }, 495 #ifdef CONFIG_FUNCTION_TRACER 496 { 497 .ctl_name = CTL_UNNUMBERED, 498 .procname = "ftrace_enabled", 499 .data = &ftrace_enabled, 500 .maxlen = sizeof(int), 501 .mode = 0644, 502 .proc_handler = &ftrace_enable_sysctl, 503 }, 504 #endif 505 #ifdef CONFIG_STACK_TRACER 506 { 507 .ctl_name = CTL_UNNUMBERED, 508 .procname = "stack_tracer_enabled", 509 .data = &stack_tracer_enabled, 510 .maxlen = sizeof(int), 511 .mode = 0644, 512 .proc_handler = &stack_trace_sysctl, 513 }, 514 #endif 515 #ifdef CONFIG_TRACING 516 { 517 .ctl_name = CTL_UNNUMBERED, 518 .procname = "ftrace_dump_on_oops", 519 .data = &ftrace_dump_on_oops, 520 .maxlen = sizeof(int), 521 .mode = 0644, 522 .proc_handler = &proc_dointvec, 523 }, 524 #endif 525 #ifdef CONFIG_MODULES 526 { 527 .ctl_name = KERN_MODPROBE, 528 .procname = "modprobe", 529 .data = &modprobe_path, 530 .maxlen = KMOD_PATH_LEN, 531 .mode = 0644, 532 .proc_handler = &proc_dostring, 533 .strategy = &sysctl_string, 534 }, 535 #endif 536 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) 537 { 538 .ctl_name = KERN_HOTPLUG, 539 .procname = "hotplug", 540 .data = &uevent_helper, 541 .maxlen = UEVENT_HELPER_PATH_LEN, 542 .mode = 0644, 543 .proc_handler = &proc_dostring, 544 .strategy = &sysctl_string, 545 }, 546 #endif 547 #ifdef CONFIG_CHR_DEV_SG 548 { 549 .ctl_name = KERN_SG_BIG_BUFF, 550 .procname = "sg-big-buff", 551 .data = &sg_big_buff, 552 .maxlen = sizeof (int), 553 .mode = 0444, 554 .proc_handler = &proc_dointvec, 555 }, 556 #endif 557 #ifdef CONFIG_BSD_PROCESS_ACCT 558 { 559 .ctl_name = KERN_ACCT, 560 .procname = "acct", 561 .data = &acct_parm, 562 .maxlen = 3*sizeof(int), 563 .mode = 0644, 564 .proc_handler = &proc_dointvec, 565 }, 566 #endif 567 #ifdef CONFIG_MAGIC_SYSRQ 568 { 569 .ctl_name = KERN_SYSRQ, 570 .procname = "sysrq", 571 .data = &__sysrq_enabled, 572 .maxlen = sizeof (int), 573 .mode = 0644, 574 .proc_handler = &proc_dointvec, 575 }, 576 #endif 577 #ifdef CONFIG_PROC_SYSCTL 578 { 579 .procname = "cad_pid", 580 .data = NULL, 581 .maxlen = sizeof (int), 582 .mode = 0600, 583 .proc_handler = &proc_do_cad_pid, 584 }, 585 #endif 586 { 587 .ctl_name = KERN_MAX_THREADS, 588 .procname = "threads-max", 589 .data = &max_threads, 590 .maxlen = sizeof(int), 591 .mode = 0644, 592 .proc_handler = &proc_dointvec, 593 }, 594 { 595 .ctl_name = KERN_RANDOM, 596 .procname = "random", 597 .mode = 0555, 598 .child = random_table, 599 }, 600 { 601 .ctl_name = KERN_OVERFLOWUID, 602 .procname = "overflowuid", 603 .data = &overflowuid, 604 .maxlen = sizeof(int), 605 .mode = 0644, 606 .proc_handler = &proc_dointvec_minmax, 607 .strategy = &sysctl_intvec, 608 .extra1 = &minolduid, 609 .extra2 = &maxolduid, 610 }, 611 { 612 .ctl_name = KERN_OVERFLOWGID, 613 .procname = "overflowgid", 614 .data = &overflowgid, 615 .maxlen = sizeof(int), 616 .mode = 0644, 617 .proc_handler = &proc_dointvec_minmax, 618 .strategy = &sysctl_intvec, 619 .extra1 = &minolduid, 620 .extra2 = &maxolduid, 621 }, 622 #ifdef CONFIG_S390 623 #ifdef CONFIG_MATHEMU 624 { 625 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 626 .procname = "ieee_emulation_warnings", 627 .data = &sysctl_ieee_emulation_warnings, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 .proc_handler = &proc_dointvec, 631 }, 632 #endif 633 { 634 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 635 .procname = "userprocess_debug", 636 .data = &sysctl_userprocess_debug, 637 .maxlen = sizeof(int), 638 .mode = 0644, 639 .proc_handler = &proc_dointvec, 640 }, 641 #endif 642 { 643 .ctl_name = KERN_PIDMAX, 644 .procname = "pid_max", 645 .data = &pid_max, 646 .maxlen = sizeof (int), 647 .mode = 0644, 648 .proc_handler = &proc_dointvec_minmax, 649 .strategy = sysctl_intvec, 650 .extra1 = &pid_max_min, 651 .extra2 = &pid_max_max, 652 }, 653 { 654 .ctl_name = KERN_PANIC_ON_OOPS, 655 .procname = "panic_on_oops", 656 .data = &panic_on_oops, 657 .maxlen = sizeof(int), 658 .mode = 0644, 659 .proc_handler = &proc_dointvec, 660 }, 661 #if defined CONFIG_PRINTK 662 { 663 .ctl_name = KERN_PRINTK, 664 .procname = "printk", 665 .data = &console_loglevel, 666 .maxlen = 4*sizeof(int), 667 .mode = 0644, 668 .proc_handler = &proc_dointvec, 669 }, 670 { 671 .ctl_name = KERN_PRINTK_RATELIMIT, 672 .procname = "printk_ratelimit", 673 .data = &printk_ratelimit_state.interval, 674 .maxlen = sizeof(int), 675 .mode = 0644, 676 .proc_handler = &proc_dointvec_jiffies, 677 .strategy = &sysctl_jiffies, 678 }, 679 { 680 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 681 .procname = "printk_ratelimit_burst", 682 .data = &printk_ratelimit_state.burst, 683 .maxlen = sizeof(int), 684 .mode = 0644, 685 .proc_handler = &proc_dointvec, 686 }, 687 #endif 688 { 689 .ctl_name = KERN_NGROUPS_MAX, 690 .procname = "ngroups_max", 691 .data = &ngroups_max, 692 .maxlen = sizeof (int), 693 .mode = 0444, 694 .proc_handler = &proc_dointvec, 695 }, 696 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 697 { 698 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 699 .procname = "unknown_nmi_panic", 700 .data = &unknown_nmi_panic, 701 .maxlen = sizeof (int), 702 .mode = 0644, 703 .proc_handler = &proc_dointvec, 704 }, 705 { 706 .procname = "nmi_watchdog", 707 .data = &nmi_watchdog_enabled, 708 .maxlen = sizeof (int), 709 .mode = 0644, 710 .proc_handler = &proc_nmi_enabled, 711 }, 712 #endif 713 #if defined(CONFIG_X86) 714 { 715 .ctl_name = KERN_PANIC_ON_NMI, 716 .procname = "panic_on_unrecovered_nmi", 717 .data = &panic_on_unrecovered_nmi, 718 .maxlen = sizeof(int), 719 .mode = 0644, 720 .proc_handler = &proc_dointvec, 721 }, 722 { 723 .ctl_name = KERN_BOOTLOADER_TYPE, 724 .procname = "bootloader_type", 725 .data = &bootloader_type, 726 .maxlen = sizeof (int), 727 .mode = 0444, 728 .proc_handler = &proc_dointvec, 729 }, 730 { 731 .ctl_name = CTL_UNNUMBERED, 732 .procname = "kstack_depth_to_print", 733 .data = &kstack_depth_to_print, 734 .maxlen = sizeof(int), 735 .mode = 0644, 736 .proc_handler = &proc_dointvec, 737 }, 738 { 739 .ctl_name = CTL_UNNUMBERED, 740 .procname = "io_delay_type", 741 .data = &io_delay_type, 742 .maxlen = sizeof(int), 743 .mode = 0644, 744 .proc_handler = &proc_dointvec, 745 }, 746 #endif 747 #if defined(CONFIG_MMU) 748 { 749 .ctl_name = KERN_RANDOMIZE, 750 .procname = "randomize_va_space", 751 .data = &randomize_va_space, 752 .maxlen = sizeof(int), 753 .mode = 0644, 754 .proc_handler = &proc_dointvec, 755 }, 756 #endif 757 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 758 { 759 .ctl_name = KERN_SPIN_RETRY, 760 .procname = "spin_retry", 761 .data = &spin_retry, 762 .maxlen = sizeof (int), 763 .mode = 0644, 764 .proc_handler = &proc_dointvec, 765 }, 766 #endif 767 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 768 { 769 .procname = "acpi_video_flags", 770 .data = &acpi_realmode_flags, 771 .maxlen = sizeof (unsigned long), 772 .mode = 0644, 773 .proc_handler = &proc_doulongvec_minmax, 774 }, 775 #endif 776 #ifdef CONFIG_IA64 777 { 778 .ctl_name = KERN_IA64_UNALIGNED, 779 .procname = "ignore-unaligned-usertrap", 780 .data = &no_unaligned_warning, 781 .maxlen = sizeof (int), 782 .mode = 0644, 783 .proc_handler = &proc_dointvec, 784 }, 785 { 786 .ctl_name = CTL_UNNUMBERED, 787 .procname = "unaligned-dump-stack", 788 .data = &unaligned_dump_stack, 789 .maxlen = sizeof (int), 790 .mode = 0644, 791 .proc_handler = &proc_dointvec, 792 }, 793 #endif 794 #ifdef CONFIG_DETECT_SOFTLOCKUP 795 { 796 .ctl_name = CTL_UNNUMBERED, 797 .procname = "softlockup_panic", 798 .data = &softlockup_panic, 799 .maxlen = sizeof(int), 800 .mode = 0644, 801 .proc_handler = &proc_dointvec_minmax, 802 .strategy = &sysctl_intvec, 803 .extra1 = &zero, 804 .extra2 = &one, 805 }, 806 { 807 .ctl_name = CTL_UNNUMBERED, 808 .procname = "softlockup_thresh", 809 .data = &softlockup_thresh, 810 .maxlen = sizeof(int), 811 .mode = 0644, 812 .proc_handler = &proc_dosoftlockup_thresh, 813 .strategy = &sysctl_intvec, 814 .extra1 = &neg_one, 815 .extra2 = &sixty, 816 }, 817 { 818 .ctl_name = CTL_UNNUMBERED, 819 .procname = "hung_task_check_count", 820 .data = &sysctl_hung_task_check_count, 821 .maxlen = sizeof(unsigned long), 822 .mode = 0644, 823 .proc_handler = &proc_doulongvec_minmax, 824 .strategy = &sysctl_intvec, 825 }, 826 { 827 .ctl_name = CTL_UNNUMBERED, 828 .procname = "hung_task_timeout_secs", 829 .data = &sysctl_hung_task_timeout_secs, 830 .maxlen = sizeof(unsigned long), 831 .mode = 0644, 832 .proc_handler = &proc_doulongvec_minmax, 833 .strategy = &sysctl_intvec, 834 }, 835 { 836 .ctl_name = CTL_UNNUMBERED, 837 .procname = "hung_task_warnings", 838 .data = &sysctl_hung_task_warnings, 839 .maxlen = sizeof(unsigned long), 840 .mode = 0644, 841 .proc_handler = &proc_doulongvec_minmax, 842 .strategy = &sysctl_intvec, 843 }, 844 #endif 845 #ifdef CONFIG_COMPAT 846 { 847 .ctl_name = KERN_COMPAT_LOG, 848 .procname = "compat-log", 849 .data = &compat_log, 850 .maxlen = sizeof (int), 851 .mode = 0644, 852 .proc_handler = &proc_dointvec, 853 }, 854 #endif 855 #ifdef CONFIG_RT_MUTEXES 856 { 857 .ctl_name = KERN_MAX_LOCK_DEPTH, 858 .procname = "max_lock_depth", 859 .data = &max_lock_depth, 860 .maxlen = sizeof(int), 861 .mode = 0644, 862 .proc_handler = &proc_dointvec, 863 }, 864 #endif 865 { 866 .ctl_name = CTL_UNNUMBERED, 867 .procname = "poweroff_cmd", 868 .data = &poweroff_cmd, 869 .maxlen = POWEROFF_CMD_PATH_LEN, 870 .mode = 0644, 871 .proc_handler = &proc_dostring, 872 .strategy = &sysctl_string, 873 }, 874 #ifdef CONFIG_KEYS 875 { 876 .ctl_name = CTL_UNNUMBERED, 877 .procname = "keys", 878 .mode = 0555, 879 .child = key_sysctls, 880 }, 881 #endif 882 #ifdef CONFIG_RCU_TORTURE_TEST 883 { 884 .ctl_name = CTL_UNNUMBERED, 885 .procname = "rcutorture_runnable", 886 .data = &rcutorture_runnable, 887 .maxlen = sizeof(int), 888 .mode = 0644, 889 .proc_handler = &proc_dointvec, 890 }, 891 #endif 892 #ifdef CONFIG_UNEVICTABLE_LRU 893 { 894 .ctl_name = CTL_UNNUMBERED, 895 .procname = "scan_unevictable_pages", 896 .data = &scan_unevictable_pages, 897 .maxlen = sizeof(scan_unevictable_pages), 898 .mode = 0644, 899 .proc_handler = &scan_unevictable_handler, 900 }, 901 #endif 902 /* 903 * NOTE: do not add new entries to this table unless you have read 904 * Documentation/sysctl/ctl_unnumbered.txt 905 */ 906 { .ctl_name = 0 } 907 }; 908 909 static struct ctl_table vm_table[] = { 910 { 911 .ctl_name = VM_OVERCOMMIT_MEMORY, 912 .procname = "overcommit_memory", 913 .data = &sysctl_overcommit_memory, 914 .maxlen = sizeof(sysctl_overcommit_memory), 915 .mode = 0644, 916 .proc_handler = &proc_dointvec, 917 }, 918 { 919 .ctl_name = VM_PANIC_ON_OOM, 920 .procname = "panic_on_oom", 921 .data = &sysctl_panic_on_oom, 922 .maxlen = sizeof(sysctl_panic_on_oom), 923 .mode = 0644, 924 .proc_handler = &proc_dointvec, 925 }, 926 { 927 .ctl_name = CTL_UNNUMBERED, 928 .procname = "oom_kill_allocating_task", 929 .data = &sysctl_oom_kill_allocating_task, 930 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 931 .mode = 0644, 932 .proc_handler = &proc_dointvec, 933 }, 934 { 935 .ctl_name = CTL_UNNUMBERED, 936 .procname = "oom_dump_tasks", 937 .data = &sysctl_oom_dump_tasks, 938 .maxlen = sizeof(sysctl_oom_dump_tasks), 939 .mode = 0644, 940 .proc_handler = &proc_dointvec, 941 }, 942 { 943 .ctl_name = VM_OVERCOMMIT_RATIO, 944 .procname = "overcommit_ratio", 945 .data = &sysctl_overcommit_ratio, 946 .maxlen = sizeof(sysctl_overcommit_ratio), 947 .mode = 0644, 948 .proc_handler = &proc_dointvec, 949 }, 950 { 951 .ctl_name = VM_PAGE_CLUSTER, 952 .procname = "page-cluster", 953 .data = &page_cluster, 954 .maxlen = sizeof(int), 955 .mode = 0644, 956 .proc_handler = &proc_dointvec, 957 }, 958 { 959 .ctl_name = VM_DIRTY_BACKGROUND, 960 .procname = "dirty_background_ratio", 961 .data = &dirty_background_ratio, 962 .maxlen = sizeof(dirty_background_ratio), 963 .mode = 0644, 964 .proc_handler = &dirty_background_ratio_handler, 965 .strategy = &sysctl_intvec, 966 .extra1 = &zero, 967 .extra2 = &one_hundred, 968 }, 969 { 970 .ctl_name = CTL_UNNUMBERED, 971 .procname = "dirty_background_bytes", 972 .data = &dirty_background_bytes, 973 .maxlen = sizeof(dirty_background_bytes), 974 .mode = 0644, 975 .proc_handler = &dirty_background_bytes_handler, 976 .strategy = &sysctl_intvec, 977 .extra1 = &one, 978 }, 979 { 980 .ctl_name = VM_DIRTY_RATIO, 981 .procname = "dirty_ratio", 982 .data = &vm_dirty_ratio, 983 .maxlen = sizeof(vm_dirty_ratio), 984 .mode = 0644, 985 .proc_handler = &dirty_ratio_handler, 986 .strategy = &sysctl_intvec, 987 .extra1 = &zero, 988 .extra2 = &one_hundred, 989 }, 990 { 991 .ctl_name = CTL_UNNUMBERED, 992 .procname = "dirty_bytes", 993 .data = &vm_dirty_bytes, 994 .maxlen = sizeof(vm_dirty_bytes), 995 .mode = 0644, 996 .proc_handler = &dirty_bytes_handler, 997 .strategy = &sysctl_intvec, 998 .extra1 = &one, 999 }, 1000 { 1001 .procname = "dirty_writeback_centisecs", 1002 .data = &dirty_writeback_interval, 1003 .maxlen = sizeof(dirty_writeback_interval), 1004 .mode = 0644, 1005 .proc_handler = &dirty_writeback_centisecs_handler, 1006 }, 1007 { 1008 .procname = "dirty_expire_centisecs", 1009 .data = &dirty_expire_interval, 1010 .maxlen = sizeof(dirty_expire_interval), 1011 .mode = 0644, 1012 .proc_handler = &proc_dointvec_userhz_jiffies, 1013 }, 1014 { 1015 .ctl_name = VM_NR_PDFLUSH_THREADS, 1016 .procname = "nr_pdflush_threads", 1017 .data = &nr_pdflush_threads, 1018 .maxlen = sizeof nr_pdflush_threads, 1019 .mode = 0444 /* read-only*/, 1020 .proc_handler = &proc_dointvec, 1021 }, 1022 { 1023 .ctl_name = VM_SWAPPINESS, 1024 .procname = "swappiness", 1025 .data = &vm_swappiness, 1026 .maxlen = sizeof(vm_swappiness), 1027 .mode = 0644, 1028 .proc_handler = &proc_dointvec_minmax, 1029 .strategy = &sysctl_intvec, 1030 .extra1 = &zero, 1031 .extra2 = &one_hundred, 1032 }, 1033 #ifdef CONFIG_HUGETLB_PAGE 1034 { 1035 .procname = "nr_hugepages", 1036 .data = NULL, 1037 .maxlen = sizeof(unsigned long), 1038 .mode = 0644, 1039 .proc_handler = &hugetlb_sysctl_handler, 1040 .extra1 = (void *)&hugetlb_zero, 1041 .extra2 = (void *)&hugetlb_infinity, 1042 }, 1043 { 1044 .ctl_name = VM_HUGETLB_GROUP, 1045 .procname = "hugetlb_shm_group", 1046 .data = &sysctl_hugetlb_shm_group, 1047 .maxlen = sizeof(gid_t), 1048 .mode = 0644, 1049 .proc_handler = &proc_dointvec, 1050 }, 1051 { 1052 .ctl_name = CTL_UNNUMBERED, 1053 .procname = "hugepages_treat_as_movable", 1054 .data = &hugepages_treat_as_movable, 1055 .maxlen = sizeof(int), 1056 .mode = 0644, 1057 .proc_handler = &hugetlb_treat_movable_handler, 1058 }, 1059 { 1060 .ctl_name = CTL_UNNUMBERED, 1061 .procname = "nr_overcommit_hugepages", 1062 .data = NULL, 1063 .maxlen = sizeof(unsigned long), 1064 .mode = 0644, 1065 .proc_handler = &hugetlb_overcommit_handler, 1066 .extra1 = (void *)&hugetlb_zero, 1067 .extra2 = (void *)&hugetlb_infinity, 1068 }, 1069 #endif 1070 { 1071 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 1072 .procname = "lowmem_reserve_ratio", 1073 .data = &sysctl_lowmem_reserve_ratio, 1074 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1075 .mode = 0644, 1076 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 1077 .strategy = &sysctl_intvec, 1078 }, 1079 { 1080 .ctl_name = VM_DROP_PAGECACHE, 1081 .procname = "drop_caches", 1082 .data = &sysctl_drop_caches, 1083 .maxlen = sizeof(int), 1084 .mode = 0644, 1085 .proc_handler = drop_caches_sysctl_handler, 1086 .strategy = &sysctl_intvec, 1087 }, 1088 { 1089 .ctl_name = VM_MIN_FREE_KBYTES, 1090 .procname = "min_free_kbytes", 1091 .data = &min_free_kbytes, 1092 .maxlen = sizeof(min_free_kbytes), 1093 .mode = 0644, 1094 .proc_handler = &min_free_kbytes_sysctl_handler, 1095 .strategy = &sysctl_intvec, 1096 .extra1 = &zero, 1097 }, 1098 { 1099 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 1100 .procname = "percpu_pagelist_fraction", 1101 .data = &percpu_pagelist_fraction, 1102 .maxlen = sizeof(percpu_pagelist_fraction), 1103 .mode = 0644, 1104 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 1105 .strategy = &sysctl_intvec, 1106 .extra1 = &min_percpu_pagelist_fract, 1107 }, 1108 #ifdef CONFIG_MMU 1109 { 1110 .ctl_name = VM_MAX_MAP_COUNT, 1111 .procname = "max_map_count", 1112 .data = &sysctl_max_map_count, 1113 .maxlen = sizeof(sysctl_max_map_count), 1114 .mode = 0644, 1115 .proc_handler = &proc_dointvec 1116 }, 1117 #else 1118 { 1119 .ctl_name = CTL_UNNUMBERED, 1120 .procname = "nr_trim_pages", 1121 .data = &sysctl_nr_trim_pages, 1122 .maxlen = sizeof(sysctl_nr_trim_pages), 1123 .mode = 0644, 1124 .proc_handler = &proc_dointvec_minmax, 1125 .strategy = &sysctl_intvec, 1126 .extra1 = &zero, 1127 }, 1128 #endif 1129 { 1130 .ctl_name = VM_LAPTOP_MODE, 1131 .procname = "laptop_mode", 1132 .data = &laptop_mode, 1133 .maxlen = sizeof(laptop_mode), 1134 .mode = 0644, 1135 .proc_handler = &proc_dointvec_jiffies, 1136 .strategy = &sysctl_jiffies, 1137 }, 1138 { 1139 .ctl_name = VM_BLOCK_DUMP, 1140 .procname = "block_dump", 1141 .data = &block_dump, 1142 .maxlen = sizeof(block_dump), 1143 .mode = 0644, 1144 .proc_handler = &proc_dointvec, 1145 .strategy = &sysctl_intvec, 1146 .extra1 = &zero, 1147 }, 1148 { 1149 .ctl_name = VM_VFS_CACHE_PRESSURE, 1150 .procname = "vfs_cache_pressure", 1151 .data = &sysctl_vfs_cache_pressure, 1152 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1153 .mode = 0644, 1154 .proc_handler = &proc_dointvec, 1155 .strategy = &sysctl_intvec, 1156 .extra1 = &zero, 1157 }, 1158 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1159 { 1160 .ctl_name = VM_LEGACY_VA_LAYOUT, 1161 .procname = "legacy_va_layout", 1162 .data = &sysctl_legacy_va_layout, 1163 .maxlen = sizeof(sysctl_legacy_va_layout), 1164 .mode = 0644, 1165 .proc_handler = &proc_dointvec, 1166 .strategy = &sysctl_intvec, 1167 .extra1 = &zero, 1168 }, 1169 #endif 1170 #ifdef CONFIG_NUMA 1171 { 1172 .ctl_name = VM_ZONE_RECLAIM_MODE, 1173 .procname = "zone_reclaim_mode", 1174 .data = &zone_reclaim_mode, 1175 .maxlen = sizeof(zone_reclaim_mode), 1176 .mode = 0644, 1177 .proc_handler = &proc_dointvec, 1178 .strategy = &sysctl_intvec, 1179 .extra1 = &zero, 1180 }, 1181 { 1182 .ctl_name = VM_MIN_UNMAPPED, 1183 .procname = "min_unmapped_ratio", 1184 .data = &sysctl_min_unmapped_ratio, 1185 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1186 .mode = 0644, 1187 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler, 1188 .strategy = &sysctl_intvec, 1189 .extra1 = &zero, 1190 .extra2 = &one_hundred, 1191 }, 1192 { 1193 .ctl_name = VM_MIN_SLAB, 1194 .procname = "min_slab_ratio", 1195 .data = &sysctl_min_slab_ratio, 1196 .maxlen = sizeof(sysctl_min_slab_ratio), 1197 .mode = 0644, 1198 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler, 1199 .strategy = &sysctl_intvec, 1200 .extra1 = &zero, 1201 .extra2 = &one_hundred, 1202 }, 1203 #endif 1204 #ifdef CONFIG_SMP 1205 { 1206 .ctl_name = CTL_UNNUMBERED, 1207 .procname = "stat_interval", 1208 .data = &sysctl_stat_interval, 1209 .maxlen = sizeof(sysctl_stat_interval), 1210 .mode = 0644, 1211 .proc_handler = &proc_dointvec_jiffies, 1212 .strategy = &sysctl_jiffies, 1213 }, 1214 #endif 1215 #ifdef CONFIG_SECURITY 1216 { 1217 .ctl_name = CTL_UNNUMBERED, 1218 .procname = "mmap_min_addr", 1219 .data = &mmap_min_addr, 1220 .maxlen = sizeof(unsigned long), 1221 .mode = 0644, 1222 .proc_handler = &proc_doulongvec_minmax, 1223 }, 1224 #endif 1225 #ifdef CONFIG_NUMA 1226 { 1227 .ctl_name = CTL_UNNUMBERED, 1228 .procname = "numa_zonelist_order", 1229 .data = &numa_zonelist_order, 1230 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1231 .mode = 0644, 1232 .proc_handler = &numa_zonelist_order_handler, 1233 .strategy = &sysctl_string, 1234 }, 1235 #endif 1236 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1237 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1238 { 1239 .ctl_name = VM_VDSO_ENABLED, 1240 .procname = "vdso_enabled", 1241 .data = &vdso_enabled, 1242 .maxlen = sizeof(vdso_enabled), 1243 .mode = 0644, 1244 .proc_handler = &proc_dointvec, 1245 .strategy = &sysctl_intvec, 1246 .extra1 = &zero, 1247 }, 1248 #endif 1249 #ifdef CONFIG_HIGHMEM 1250 { 1251 .ctl_name = CTL_UNNUMBERED, 1252 .procname = "highmem_is_dirtyable", 1253 .data = &vm_highmem_is_dirtyable, 1254 .maxlen = sizeof(vm_highmem_is_dirtyable), 1255 .mode = 0644, 1256 .proc_handler = &proc_dointvec_minmax, 1257 .strategy = &sysctl_intvec, 1258 .extra1 = &zero, 1259 .extra2 = &one, 1260 }, 1261 #endif 1262 /* 1263 * NOTE: do not add new entries to this table unless you have read 1264 * Documentation/sysctl/ctl_unnumbered.txt 1265 */ 1266 { .ctl_name = 0 } 1267 }; 1268 1269 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1270 static struct ctl_table binfmt_misc_table[] = { 1271 { .ctl_name = 0 } 1272 }; 1273 #endif 1274 1275 static struct ctl_table fs_table[] = { 1276 { 1277 .ctl_name = FS_NRINODE, 1278 .procname = "inode-nr", 1279 .data = &inodes_stat, 1280 .maxlen = 2*sizeof(int), 1281 .mode = 0444, 1282 .proc_handler = &proc_dointvec, 1283 }, 1284 { 1285 .ctl_name = FS_STATINODE, 1286 .procname = "inode-state", 1287 .data = &inodes_stat, 1288 .maxlen = 7*sizeof(int), 1289 .mode = 0444, 1290 .proc_handler = &proc_dointvec, 1291 }, 1292 { 1293 .procname = "file-nr", 1294 .data = &files_stat, 1295 .maxlen = 3*sizeof(int), 1296 .mode = 0444, 1297 .proc_handler = &proc_nr_files, 1298 }, 1299 { 1300 .ctl_name = FS_MAXFILE, 1301 .procname = "file-max", 1302 .data = &files_stat.max_files, 1303 .maxlen = sizeof(int), 1304 .mode = 0644, 1305 .proc_handler = &proc_dointvec, 1306 }, 1307 { 1308 .ctl_name = CTL_UNNUMBERED, 1309 .procname = "nr_open", 1310 .data = &sysctl_nr_open, 1311 .maxlen = sizeof(int), 1312 .mode = 0644, 1313 .proc_handler = &proc_dointvec_minmax, 1314 .extra1 = &sysctl_nr_open_min, 1315 .extra2 = &sysctl_nr_open_max, 1316 }, 1317 { 1318 .ctl_name = FS_DENTRY, 1319 .procname = "dentry-state", 1320 .data = &dentry_stat, 1321 .maxlen = 6*sizeof(int), 1322 .mode = 0444, 1323 .proc_handler = &proc_dointvec, 1324 }, 1325 { 1326 .ctl_name = FS_OVERFLOWUID, 1327 .procname = "overflowuid", 1328 .data = &fs_overflowuid, 1329 .maxlen = sizeof(int), 1330 .mode = 0644, 1331 .proc_handler = &proc_dointvec_minmax, 1332 .strategy = &sysctl_intvec, 1333 .extra1 = &minolduid, 1334 .extra2 = &maxolduid, 1335 }, 1336 { 1337 .ctl_name = FS_OVERFLOWGID, 1338 .procname = "overflowgid", 1339 .data = &fs_overflowgid, 1340 .maxlen = sizeof(int), 1341 .mode = 0644, 1342 .proc_handler = &proc_dointvec_minmax, 1343 .strategy = &sysctl_intvec, 1344 .extra1 = &minolduid, 1345 .extra2 = &maxolduid, 1346 }, 1347 #ifdef CONFIG_FILE_LOCKING 1348 { 1349 .ctl_name = FS_LEASES, 1350 .procname = "leases-enable", 1351 .data = &leases_enable, 1352 .maxlen = sizeof(int), 1353 .mode = 0644, 1354 .proc_handler = &proc_dointvec, 1355 }, 1356 #endif 1357 #ifdef CONFIG_DNOTIFY 1358 { 1359 .ctl_name = FS_DIR_NOTIFY, 1360 .procname = "dir-notify-enable", 1361 .data = &dir_notify_enable, 1362 .maxlen = sizeof(int), 1363 .mode = 0644, 1364 .proc_handler = &proc_dointvec, 1365 }, 1366 #endif 1367 #ifdef CONFIG_MMU 1368 #ifdef CONFIG_FILE_LOCKING 1369 { 1370 .ctl_name = FS_LEASE_TIME, 1371 .procname = "lease-break-time", 1372 .data = &lease_break_time, 1373 .maxlen = sizeof(int), 1374 .mode = 0644, 1375 .proc_handler = &proc_dointvec_minmax, 1376 .strategy = &sysctl_intvec, 1377 .extra1 = &zero, 1378 .extra2 = &two, 1379 }, 1380 #endif 1381 #ifdef CONFIG_AIO 1382 { 1383 .procname = "aio-nr", 1384 .data = &aio_nr, 1385 .maxlen = sizeof(aio_nr), 1386 .mode = 0444, 1387 .proc_handler = &proc_doulongvec_minmax, 1388 }, 1389 { 1390 .procname = "aio-max-nr", 1391 .data = &aio_max_nr, 1392 .maxlen = sizeof(aio_max_nr), 1393 .mode = 0644, 1394 .proc_handler = &proc_doulongvec_minmax, 1395 }, 1396 #endif /* CONFIG_AIO */ 1397 #ifdef CONFIG_INOTIFY_USER 1398 { 1399 .ctl_name = FS_INOTIFY, 1400 .procname = "inotify", 1401 .mode = 0555, 1402 .child = inotify_table, 1403 }, 1404 #endif 1405 #ifdef CONFIG_EPOLL 1406 { 1407 .procname = "epoll", 1408 .mode = 0555, 1409 .child = epoll_table, 1410 }, 1411 #endif 1412 #endif 1413 { 1414 .ctl_name = KERN_SETUID_DUMPABLE, 1415 .procname = "suid_dumpable", 1416 .data = &suid_dumpable, 1417 .maxlen = sizeof(int), 1418 .mode = 0644, 1419 .proc_handler = &proc_dointvec, 1420 }, 1421 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1422 { 1423 .ctl_name = CTL_UNNUMBERED, 1424 .procname = "binfmt_misc", 1425 .mode = 0555, 1426 .child = binfmt_misc_table, 1427 }, 1428 #endif 1429 /* 1430 * NOTE: do not add new entries to this table unless you have read 1431 * Documentation/sysctl/ctl_unnumbered.txt 1432 */ 1433 { .ctl_name = 0 } 1434 }; 1435 1436 static struct ctl_table debug_table[] = { 1437 #if defined(CONFIG_X86) || defined(CONFIG_PPC) 1438 { 1439 .ctl_name = CTL_UNNUMBERED, 1440 .procname = "exception-trace", 1441 .data = &show_unhandled_signals, 1442 .maxlen = sizeof(int), 1443 .mode = 0644, 1444 .proc_handler = proc_dointvec 1445 }, 1446 #endif 1447 { .ctl_name = 0 } 1448 }; 1449 1450 static struct ctl_table dev_table[] = { 1451 { .ctl_name = 0 } 1452 }; 1453 1454 static DEFINE_SPINLOCK(sysctl_lock); 1455 1456 /* called under sysctl_lock */ 1457 static int use_table(struct ctl_table_header *p) 1458 { 1459 if (unlikely(p->unregistering)) 1460 return 0; 1461 p->used++; 1462 return 1; 1463 } 1464 1465 /* called under sysctl_lock */ 1466 static void unuse_table(struct ctl_table_header *p) 1467 { 1468 if (!--p->used) 1469 if (unlikely(p->unregistering)) 1470 complete(p->unregistering); 1471 } 1472 1473 /* called under sysctl_lock, will reacquire if has to wait */ 1474 static void start_unregistering(struct ctl_table_header *p) 1475 { 1476 /* 1477 * if p->used is 0, nobody will ever touch that entry again; 1478 * we'll eliminate all paths to it before dropping sysctl_lock 1479 */ 1480 if (unlikely(p->used)) { 1481 struct completion wait; 1482 init_completion(&wait); 1483 p->unregistering = &wait; 1484 spin_unlock(&sysctl_lock); 1485 wait_for_completion(&wait); 1486 spin_lock(&sysctl_lock); 1487 } else { 1488 /* anything non-NULL; we'll never dereference it */ 1489 p->unregistering = ERR_PTR(-EINVAL); 1490 } 1491 /* 1492 * do not remove from the list until nobody holds it; walking the 1493 * list in do_sysctl() relies on that. 1494 */ 1495 list_del_init(&p->ctl_entry); 1496 } 1497 1498 void sysctl_head_get(struct ctl_table_header *head) 1499 { 1500 spin_lock(&sysctl_lock); 1501 head->count++; 1502 spin_unlock(&sysctl_lock); 1503 } 1504 1505 void sysctl_head_put(struct ctl_table_header *head) 1506 { 1507 spin_lock(&sysctl_lock); 1508 if (!--head->count) 1509 kfree(head); 1510 spin_unlock(&sysctl_lock); 1511 } 1512 1513 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head) 1514 { 1515 if (!head) 1516 BUG(); 1517 spin_lock(&sysctl_lock); 1518 if (!use_table(head)) 1519 head = ERR_PTR(-ENOENT); 1520 spin_unlock(&sysctl_lock); 1521 return head; 1522 } 1523 1524 void sysctl_head_finish(struct ctl_table_header *head) 1525 { 1526 if (!head) 1527 return; 1528 spin_lock(&sysctl_lock); 1529 unuse_table(head); 1530 spin_unlock(&sysctl_lock); 1531 } 1532 1533 static struct ctl_table_set * 1534 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces) 1535 { 1536 struct ctl_table_set *set = &root->default_set; 1537 if (root->lookup) 1538 set = root->lookup(root, namespaces); 1539 return set; 1540 } 1541 1542 static struct list_head * 1543 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces) 1544 { 1545 struct ctl_table_set *set = lookup_header_set(root, namespaces); 1546 return &set->list; 1547 } 1548 1549 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces, 1550 struct ctl_table_header *prev) 1551 { 1552 struct ctl_table_root *root; 1553 struct list_head *header_list; 1554 struct ctl_table_header *head; 1555 struct list_head *tmp; 1556 1557 spin_lock(&sysctl_lock); 1558 if (prev) { 1559 head = prev; 1560 tmp = &prev->ctl_entry; 1561 unuse_table(prev); 1562 goto next; 1563 } 1564 tmp = &root_table_header.ctl_entry; 1565 for (;;) { 1566 head = list_entry(tmp, struct ctl_table_header, ctl_entry); 1567 1568 if (!use_table(head)) 1569 goto next; 1570 spin_unlock(&sysctl_lock); 1571 return head; 1572 next: 1573 root = head->root; 1574 tmp = tmp->next; 1575 header_list = lookup_header_list(root, namespaces); 1576 if (tmp != header_list) 1577 continue; 1578 1579 do { 1580 root = list_entry(root->root_list.next, 1581 struct ctl_table_root, root_list); 1582 if (root == &sysctl_table_root) 1583 goto out; 1584 header_list = lookup_header_list(root, namespaces); 1585 } while (list_empty(header_list)); 1586 tmp = header_list->next; 1587 } 1588 out: 1589 spin_unlock(&sysctl_lock); 1590 return NULL; 1591 } 1592 1593 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev) 1594 { 1595 return __sysctl_head_next(current->nsproxy, prev); 1596 } 1597 1598 void register_sysctl_root(struct ctl_table_root *root) 1599 { 1600 spin_lock(&sysctl_lock); 1601 list_add_tail(&root->root_list, &sysctl_table_root.root_list); 1602 spin_unlock(&sysctl_lock); 1603 } 1604 1605 #ifdef CONFIG_SYSCTL_SYSCALL 1606 /* Perform the actual read/write of a sysctl table entry. */ 1607 static int do_sysctl_strategy(struct ctl_table_root *root, 1608 struct ctl_table *table, 1609 void __user *oldval, size_t __user *oldlenp, 1610 void __user *newval, size_t newlen) 1611 { 1612 int op = 0, rc; 1613 1614 if (oldval) 1615 op |= MAY_READ; 1616 if (newval) 1617 op |= MAY_WRITE; 1618 if (sysctl_perm(root, table, op)) 1619 return -EPERM; 1620 1621 if (table->strategy) { 1622 rc = table->strategy(table, oldval, oldlenp, newval, newlen); 1623 if (rc < 0) 1624 return rc; 1625 if (rc > 0) 1626 return 0; 1627 } 1628 1629 /* If there is no strategy routine, or if the strategy returns 1630 * zero, proceed with automatic r/w */ 1631 if (table->data && table->maxlen) { 1632 rc = sysctl_data(table, oldval, oldlenp, newval, newlen); 1633 if (rc < 0) 1634 return rc; 1635 } 1636 return 0; 1637 } 1638 1639 static int parse_table(int __user *name, int nlen, 1640 void __user *oldval, size_t __user *oldlenp, 1641 void __user *newval, size_t newlen, 1642 struct ctl_table_root *root, 1643 struct ctl_table *table) 1644 { 1645 int n; 1646 repeat: 1647 if (!nlen) 1648 return -ENOTDIR; 1649 if (get_user(n, name)) 1650 return -EFAULT; 1651 for ( ; table->ctl_name || table->procname; table++) { 1652 if (!table->ctl_name) 1653 continue; 1654 if (n == table->ctl_name) { 1655 int error; 1656 if (table->child) { 1657 if (sysctl_perm(root, table, MAY_EXEC)) 1658 return -EPERM; 1659 name++; 1660 nlen--; 1661 table = table->child; 1662 goto repeat; 1663 } 1664 error = do_sysctl_strategy(root, table, 1665 oldval, oldlenp, 1666 newval, newlen); 1667 return error; 1668 } 1669 } 1670 return -ENOTDIR; 1671 } 1672 1673 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1674 void __user *newval, size_t newlen) 1675 { 1676 struct ctl_table_header *head; 1677 int error = -ENOTDIR; 1678 1679 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1680 return -ENOTDIR; 1681 if (oldval) { 1682 int old_len; 1683 if (!oldlenp || get_user(old_len, oldlenp)) 1684 return -EFAULT; 1685 } 1686 1687 for (head = sysctl_head_next(NULL); head; 1688 head = sysctl_head_next(head)) { 1689 error = parse_table(name, nlen, oldval, oldlenp, 1690 newval, newlen, 1691 head->root, head->ctl_table); 1692 if (error != -ENOTDIR) { 1693 sysctl_head_finish(head); 1694 break; 1695 } 1696 } 1697 return error; 1698 } 1699 1700 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 1701 { 1702 struct __sysctl_args tmp; 1703 int error; 1704 1705 if (copy_from_user(&tmp, args, sizeof(tmp))) 1706 return -EFAULT; 1707 1708 error = deprecated_sysctl_warning(&tmp); 1709 if (error) 1710 goto out; 1711 1712 lock_kernel(); 1713 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1714 tmp.newval, tmp.newlen); 1715 unlock_kernel(); 1716 out: 1717 return error; 1718 } 1719 #endif /* CONFIG_SYSCTL_SYSCALL */ 1720 1721 /* 1722 * sysctl_perm does NOT grant the superuser all rights automatically, because 1723 * some sysctl variables are readonly even to root. 1724 */ 1725 1726 static int test_perm(int mode, int op) 1727 { 1728 if (!current_euid()) 1729 mode >>= 6; 1730 else if (in_egroup_p(0)) 1731 mode >>= 3; 1732 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0) 1733 return 0; 1734 return -EACCES; 1735 } 1736 1737 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op) 1738 { 1739 int error; 1740 int mode; 1741 1742 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC)); 1743 if (error) 1744 return error; 1745 1746 if (root->permissions) 1747 mode = root->permissions(root, current->nsproxy, table); 1748 else 1749 mode = table->mode; 1750 1751 return test_perm(mode, op); 1752 } 1753 1754 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table) 1755 { 1756 for (; table->ctl_name || table->procname; table++) { 1757 table->parent = parent; 1758 if (table->child) 1759 sysctl_set_parent(table, table->child); 1760 } 1761 } 1762 1763 static __init int sysctl_init(void) 1764 { 1765 sysctl_set_parent(NULL, root_table); 1766 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1767 { 1768 int err; 1769 err = sysctl_check_table(current->nsproxy, root_table); 1770 } 1771 #endif 1772 return 0; 1773 } 1774 1775 core_initcall(sysctl_init); 1776 1777 static struct ctl_table *is_branch_in(struct ctl_table *branch, 1778 struct ctl_table *table) 1779 { 1780 struct ctl_table *p; 1781 const char *s = branch->procname; 1782 1783 /* branch should have named subdirectory as its first element */ 1784 if (!s || !branch->child) 1785 return NULL; 1786 1787 /* ... and nothing else */ 1788 if (branch[1].procname || branch[1].ctl_name) 1789 return NULL; 1790 1791 /* table should contain subdirectory with the same name */ 1792 for (p = table; p->procname || p->ctl_name; p++) { 1793 if (!p->child) 1794 continue; 1795 if (p->procname && strcmp(p->procname, s) == 0) 1796 return p; 1797 } 1798 return NULL; 1799 } 1800 1801 /* see if attaching q to p would be an improvement */ 1802 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q) 1803 { 1804 struct ctl_table *to = p->ctl_table, *by = q->ctl_table; 1805 struct ctl_table *next; 1806 int is_better = 0; 1807 int not_in_parent = !p->attached_by; 1808 1809 while ((next = is_branch_in(by, to)) != NULL) { 1810 if (by == q->attached_by) 1811 is_better = 1; 1812 if (to == p->attached_by) 1813 not_in_parent = 1; 1814 by = by->child; 1815 to = next->child; 1816 } 1817 1818 if (is_better && not_in_parent) { 1819 q->attached_by = by; 1820 q->attached_to = to; 1821 q->parent = p; 1822 } 1823 } 1824 1825 /** 1826 * __register_sysctl_paths - register a sysctl hierarchy 1827 * @root: List of sysctl headers to register on 1828 * @namespaces: Data to compute which lists of sysctl entries are visible 1829 * @path: The path to the directory the sysctl table is in. 1830 * @table: the top-level table structure 1831 * 1832 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1833 * array. A completely 0 filled entry terminates the table. 1834 * 1835 * The members of the &struct ctl_table structure are used as follows: 1836 * 1837 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1838 * must be unique within that level of sysctl 1839 * 1840 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1841 * enter a sysctl file 1842 * 1843 * data - a pointer to data for use by proc_handler 1844 * 1845 * maxlen - the maximum size in bytes of the data 1846 * 1847 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1848 * 1849 * child - a pointer to the child sysctl table if this entry is a directory, or 1850 * %NULL. 1851 * 1852 * proc_handler - the text handler routine (described below) 1853 * 1854 * strategy - the strategy routine (described below) 1855 * 1856 * de - for internal use by the sysctl routines 1857 * 1858 * extra1, extra2 - extra pointers usable by the proc handler routines 1859 * 1860 * Leaf nodes in the sysctl tree will be represented by a single file 1861 * under /proc; non-leaf nodes will be represented by directories. 1862 * 1863 * sysctl(2) can automatically manage read and write requests through 1864 * the sysctl table. The data and maxlen fields of the ctl_table 1865 * struct enable minimal validation of the values being written to be 1866 * performed, and the mode field allows minimal authentication. 1867 * 1868 * More sophisticated management can be enabled by the provision of a 1869 * strategy routine with the table entry. This will be called before 1870 * any automatic read or write of the data is performed. 1871 * 1872 * The strategy routine may return 1873 * 1874 * < 0 - Error occurred (error is passed to user process) 1875 * 1876 * 0 - OK - proceed with automatic read or write. 1877 * 1878 * > 0 - OK - read or write has been done by the strategy routine, so 1879 * return immediately. 1880 * 1881 * There must be a proc_handler routine for any terminal nodes 1882 * mirrored under /proc/sys (non-terminals are handled by a built-in 1883 * directory handler). Several default handlers are available to 1884 * cover common cases - 1885 * 1886 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1887 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1888 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1889 * 1890 * It is the handler's job to read the input buffer from user memory 1891 * and process it. The handler should return 0 on success. 1892 * 1893 * This routine returns %NULL on a failure to register, and a pointer 1894 * to the table header on success. 1895 */ 1896 struct ctl_table_header *__register_sysctl_paths( 1897 struct ctl_table_root *root, 1898 struct nsproxy *namespaces, 1899 const struct ctl_path *path, struct ctl_table *table) 1900 { 1901 struct ctl_table_header *header; 1902 struct ctl_table *new, **prevp; 1903 unsigned int n, npath; 1904 struct ctl_table_set *set; 1905 1906 /* Count the path components */ 1907 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath) 1908 ; 1909 1910 /* 1911 * For each path component, allocate a 2-element ctl_table array. 1912 * The first array element will be filled with the sysctl entry 1913 * for this, the second will be the sentinel (ctl_name == 0). 1914 * 1915 * We allocate everything in one go so that we don't have to 1916 * worry about freeing additional memory in unregister_sysctl_table. 1917 */ 1918 header = kzalloc(sizeof(struct ctl_table_header) + 1919 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL); 1920 if (!header) 1921 return NULL; 1922 1923 new = (struct ctl_table *) (header + 1); 1924 1925 /* Now connect the dots */ 1926 prevp = &header->ctl_table; 1927 for (n = 0; n < npath; ++n, ++path) { 1928 /* Copy the procname */ 1929 new->procname = path->procname; 1930 new->ctl_name = path->ctl_name; 1931 new->mode = 0555; 1932 1933 *prevp = new; 1934 prevp = &new->child; 1935 1936 new += 2; 1937 } 1938 *prevp = table; 1939 header->ctl_table_arg = table; 1940 1941 INIT_LIST_HEAD(&header->ctl_entry); 1942 header->used = 0; 1943 header->unregistering = NULL; 1944 header->root = root; 1945 sysctl_set_parent(NULL, header->ctl_table); 1946 header->count = 1; 1947 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK 1948 if (sysctl_check_table(namespaces, header->ctl_table)) { 1949 kfree(header); 1950 return NULL; 1951 } 1952 #endif 1953 spin_lock(&sysctl_lock); 1954 header->set = lookup_header_set(root, namespaces); 1955 header->attached_by = header->ctl_table; 1956 header->attached_to = root_table; 1957 header->parent = &root_table_header; 1958 for (set = header->set; set; set = set->parent) { 1959 struct ctl_table_header *p; 1960 list_for_each_entry(p, &set->list, ctl_entry) { 1961 if (p->unregistering) 1962 continue; 1963 try_attach(p, header); 1964 } 1965 } 1966 header->parent->count++; 1967 list_add_tail(&header->ctl_entry, &header->set->list); 1968 spin_unlock(&sysctl_lock); 1969 1970 return header; 1971 } 1972 1973 /** 1974 * register_sysctl_table_path - register a sysctl table hierarchy 1975 * @path: The path to the directory the sysctl table is in. 1976 * @table: the top-level table structure 1977 * 1978 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1979 * array. A completely 0 filled entry terminates the table. 1980 * 1981 * See __register_sysctl_paths for more details. 1982 */ 1983 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 1984 struct ctl_table *table) 1985 { 1986 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy, 1987 path, table); 1988 } 1989 1990 /** 1991 * register_sysctl_table - register a sysctl table hierarchy 1992 * @table: the top-level table structure 1993 * 1994 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1995 * array. A completely 0 filled entry terminates the table. 1996 * 1997 * See register_sysctl_paths for more details. 1998 */ 1999 struct ctl_table_header *register_sysctl_table(struct ctl_table *table) 2000 { 2001 static const struct ctl_path null_path[] = { {} }; 2002 2003 return register_sysctl_paths(null_path, table); 2004 } 2005 2006 /** 2007 * unregister_sysctl_table - unregister a sysctl table hierarchy 2008 * @header: the header returned from register_sysctl_table 2009 * 2010 * Unregisters the sysctl table and all children. proc entries may not 2011 * actually be removed until they are no longer used by anyone. 2012 */ 2013 void unregister_sysctl_table(struct ctl_table_header * header) 2014 { 2015 might_sleep(); 2016 2017 if (header == NULL) 2018 return; 2019 2020 spin_lock(&sysctl_lock); 2021 start_unregistering(header); 2022 if (!--header->parent->count) { 2023 WARN_ON(1); 2024 kfree(header->parent); 2025 } 2026 if (!--header->count) 2027 kfree(header); 2028 spin_unlock(&sysctl_lock); 2029 } 2030 2031 int sysctl_is_seen(struct ctl_table_header *p) 2032 { 2033 struct ctl_table_set *set = p->set; 2034 int res; 2035 spin_lock(&sysctl_lock); 2036 if (p->unregistering) 2037 res = 0; 2038 else if (!set->is_seen) 2039 res = 1; 2040 else 2041 res = set->is_seen(set); 2042 spin_unlock(&sysctl_lock); 2043 return res; 2044 } 2045 2046 void setup_sysctl_set(struct ctl_table_set *p, 2047 struct ctl_table_set *parent, 2048 int (*is_seen)(struct ctl_table_set *)) 2049 { 2050 INIT_LIST_HEAD(&p->list); 2051 p->parent = parent ? parent : &sysctl_table_root.default_set; 2052 p->is_seen = is_seen; 2053 } 2054 2055 #else /* !CONFIG_SYSCTL */ 2056 struct ctl_table_header *register_sysctl_table(struct ctl_table * table) 2057 { 2058 return NULL; 2059 } 2060 2061 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, 2062 struct ctl_table *table) 2063 { 2064 return NULL; 2065 } 2066 2067 void unregister_sysctl_table(struct ctl_table_header * table) 2068 { 2069 } 2070 2071 void setup_sysctl_set(struct ctl_table_set *p, 2072 struct ctl_table_set *parent, 2073 int (*is_seen)(struct ctl_table_set *)) 2074 { 2075 } 2076 2077 void sysctl_head_put(struct ctl_table_header *head) 2078 { 2079 } 2080 2081 #endif /* CONFIG_SYSCTL */ 2082 2083 /* 2084 * /proc/sys support 2085 */ 2086 2087 #ifdef CONFIG_PROC_SYSCTL 2088 2089 static int _proc_do_string(void* data, int maxlen, int write, 2090 struct file *filp, void __user *buffer, 2091 size_t *lenp, loff_t *ppos) 2092 { 2093 size_t len; 2094 char __user *p; 2095 char c; 2096 2097 if (!data || !maxlen || !*lenp) { 2098 *lenp = 0; 2099 return 0; 2100 } 2101 2102 if (write) { 2103 len = 0; 2104 p = buffer; 2105 while (len < *lenp) { 2106 if (get_user(c, p++)) 2107 return -EFAULT; 2108 if (c == 0 || c == '\n') 2109 break; 2110 len++; 2111 } 2112 if (len >= maxlen) 2113 len = maxlen-1; 2114 if(copy_from_user(data, buffer, len)) 2115 return -EFAULT; 2116 ((char *) data)[len] = 0; 2117 *ppos += *lenp; 2118 } else { 2119 len = strlen(data); 2120 if (len > maxlen) 2121 len = maxlen; 2122 2123 if (*ppos > len) { 2124 *lenp = 0; 2125 return 0; 2126 } 2127 2128 data += *ppos; 2129 len -= *ppos; 2130 2131 if (len > *lenp) 2132 len = *lenp; 2133 if (len) 2134 if(copy_to_user(buffer, data, len)) 2135 return -EFAULT; 2136 if (len < *lenp) { 2137 if(put_user('\n', ((char __user *) buffer) + len)) 2138 return -EFAULT; 2139 len++; 2140 } 2141 *lenp = len; 2142 *ppos += len; 2143 } 2144 return 0; 2145 } 2146 2147 /** 2148 * proc_dostring - read a string sysctl 2149 * @table: the sysctl table 2150 * @write: %TRUE if this is a write to the sysctl file 2151 * @filp: the file structure 2152 * @buffer: the user buffer 2153 * @lenp: the size of the user buffer 2154 * @ppos: file position 2155 * 2156 * Reads/writes a string from/to the user buffer. If the kernel 2157 * buffer provided is not large enough to hold the string, the 2158 * string is truncated. The copied string is %NULL-terminated. 2159 * If the string is being read by the user process, it is copied 2160 * and a newline '\n' is added. It is truncated if the buffer is 2161 * not large enough. 2162 * 2163 * Returns 0 on success. 2164 */ 2165 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2166 void __user *buffer, size_t *lenp, loff_t *ppos) 2167 { 2168 return _proc_do_string(table->data, table->maxlen, write, filp, 2169 buffer, lenp, ppos); 2170 } 2171 2172 2173 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 2174 int *valp, 2175 int write, void *data) 2176 { 2177 if (write) { 2178 *valp = *negp ? -*lvalp : *lvalp; 2179 } else { 2180 int val = *valp; 2181 if (val < 0) { 2182 *negp = -1; 2183 *lvalp = (unsigned long)-val; 2184 } else { 2185 *negp = 0; 2186 *lvalp = (unsigned long)val; 2187 } 2188 } 2189 return 0; 2190 } 2191 2192 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2193 int write, struct file *filp, void __user *buffer, 2194 size_t *lenp, loff_t *ppos, 2195 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2196 int write, void *data), 2197 void *data) 2198 { 2199 #define TMPBUFLEN 21 2200 int *i, vleft, first=1, neg, val; 2201 unsigned long lval; 2202 size_t left, len; 2203 2204 char buf[TMPBUFLEN], *p; 2205 char __user *s = buffer; 2206 2207 if (!tbl_data || !table->maxlen || !*lenp || 2208 (*ppos && !write)) { 2209 *lenp = 0; 2210 return 0; 2211 } 2212 2213 i = (int *) tbl_data; 2214 vleft = table->maxlen / sizeof(*i); 2215 left = *lenp; 2216 2217 if (!conv) 2218 conv = do_proc_dointvec_conv; 2219 2220 for (; left && vleft--; i++, first=0) { 2221 if (write) { 2222 while (left) { 2223 char c; 2224 if (get_user(c, s)) 2225 return -EFAULT; 2226 if (!isspace(c)) 2227 break; 2228 left--; 2229 s++; 2230 } 2231 if (!left) 2232 break; 2233 neg = 0; 2234 len = left; 2235 if (len > sizeof(buf) - 1) 2236 len = sizeof(buf) - 1; 2237 if (copy_from_user(buf, s, len)) 2238 return -EFAULT; 2239 buf[len] = 0; 2240 p = buf; 2241 if (*p == '-' && left > 1) { 2242 neg = 1; 2243 p++; 2244 } 2245 if (*p < '0' || *p > '9') 2246 break; 2247 2248 lval = simple_strtoul(p, &p, 0); 2249 2250 len = p-buf; 2251 if ((len < left) && *p && !isspace(*p)) 2252 break; 2253 if (neg) 2254 val = -val; 2255 s += len; 2256 left -= len; 2257 2258 if (conv(&neg, &lval, i, 1, data)) 2259 break; 2260 } else { 2261 p = buf; 2262 if (!first) 2263 *p++ = '\t'; 2264 2265 if (conv(&neg, &lval, i, 0, data)) 2266 break; 2267 2268 sprintf(p, "%s%lu", neg ? "-" : "", lval); 2269 len = strlen(buf); 2270 if (len > left) 2271 len = left; 2272 if(copy_to_user(s, buf, len)) 2273 return -EFAULT; 2274 left -= len; 2275 s += len; 2276 } 2277 } 2278 2279 if (!write && !first && left) { 2280 if(put_user('\n', s)) 2281 return -EFAULT; 2282 left--, s++; 2283 } 2284 if (write) { 2285 while (left) { 2286 char c; 2287 if (get_user(c, s++)) 2288 return -EFAULT; 2289 if (!isspace(c)) 2290 break; 2291 left--; 2292 } 2293 } 2294 if (write && first) 2295 return -EINVAL; 2296 *lenp -= left; 2297 *ppos += *lenp; 2298 return 0; 2299 #undef TMPBUFLEN 2300 } 2301 2302 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2303 void __user *buffer, size_t *lenp, loff_t *ppos, 2304 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 2305 int write, void *data), 2306 void *data) 2307 { 2308 return __do_proc_dointvec(table->data, table, write, filp, 2309 buffer, lenp, ppos, conv, data); 2310 } 2311 2312 /** 2313 * proc_dointvec - read a vector of integers 2314 * @table: the sysctl table 2315 * @write: %TRUE if this is a write to the sysctl file 2316 * @filp: the file structure 2317 * @buffer: the user buffer 2318 * @lenp: the size of the user buffer 2319 * @ppos: file position 2320 * 2321 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2322 * values from/to the user buffer, treated as an ASCII string. 2323 * 2324 * Returns 0 on success. 2325 */ 2326 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2327 void __user *buffer, size_t *lenp, loff_t *ppos) 2328 { 2329 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2330 NULL,NULL); 2331 } 2332 2333 /* 2334 * Taint values can only be increased 2335 * This means we can safely use a temporary. 2336 */ 2337 static int proc_taint(struct ctl_table *table, int write, struct file *filp, 2338 void __user *buffer, size_t *lenp, loff_t *ppos) 2339 { 2340 struct ctl_table t; 2341 unsigned long tmptaint = get_taint(); 2342 int err; 2343 2344 if (write && !capable(CAP_SYS_ADMIN)) 2345 return -EPERM; 2346 2347 t = *table; 2348 t.data = &tmptaint; 2349 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos); 2350 if (err < 0) 2351 return err; 2352 2353 if (write) { 2354 /* 2355 * Poor man's atomic or. Not worth adding a primitive 2356 * to everyone's atomic.h for this 2357 */ 2358 int i; 2359 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2360 if ((tmptaint >> i) & 1) 2361 add_taint(i); 2362 } 2363 } 2364 2365 return err; 2366 } 2367 2368 struct do_proc_dointvec_minmax_conv_param { 2369 int *min; 2370 int *max; 2371 }; 2372 2373 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 2374 int *valp, 2375 int write, void *data) 2376 { 2377 struct do_proc_dointvec_minmax_conv_param *param = data; 2378 if (write) { 2379 int val = *negp ? -*lvalp : *lvalp; 2380 if ((param->min && *param->min > val) || 2381 (param->max && *param->max < val)) 2382 return -EINVAL; 2383 *valp = val; 2384 } else { 2385 int val = *valp; 2386 if (val < 0) { 2387 *negp = -1; 2388 *lvalp = (unsigned long)-val; 2389 } else { 2390 *negp = 0; 2391 *lvalp = (unsigned long)val; 2392 } 2393 } 2394 return 0; 2395 } 2396 2397 /** 2398 * proc_dointvec_minmax - read a vector of integers with min/max values 2399 * @table: the sysctl table 2400 * @write: %TRUE if this is a write to the sysctl file 2401 * @filp: the file structure 2402 * @buffer: the user buffer 2403 * @lenp: the size of the user buffer 2404 * @ppos: file position 2405 * 2406 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2407 * values from/to the user buffer, treated as an ASCII string. 2408 * 2409 * This routine will ensure the values are within the range specified by 2410 * table->extra1 (min) and table->extra2 (max). 2411 * 2412 * Returns 0 on success. 2413 */ 2414 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2415 void __user *buffer, size_t *lenp, loff_t *ppos) 2416 { 2417 struct do_proc_dointvec_minmax_conv_param param = { 2418 .min = (int *) table->extra1, 2419 .max = (int *) table->extra2, 2420 }; 2421 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2422 do_proc_dointvec_minmax_conv, ¶m); 2423 } 2424 2425 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2426 struct file *filp, 2427 void __user *buffer, 2428 size_t *lenp, loff_t *ppos, 2429 unsigned long convmul, 2430 unsigned long convdiv) 2431 { 2432 #define TMPBUFLEN 21 2433 unsigned long *i, *min, *max, val; 2434 int vleft, first=1, neg; 2435 size_t len, left; 2436 char buf[TMPBUFLEN], *p; 2437 char __user *s = buffer; 2438 2439 if (!data || !table->maxlen || !*lenp || 2440 (*ppos && !write)) { 2441 *lenp = 0; 2442 return 0; 2443 } 2444 2445 i = (unsigned long *) data; 2446 min = (unsigned long *) table->extra1; 2447 max = (unsigned long *) table->extra2; 2448 vleft = table->maxlen / sizeof(unsigned long); 2449 left = *lenp; 2450 2451 for (; left && vleft--; i++, min++, max++, first=0) { 2452 if (write) { 2453 while (left) { 2454 char c; 2455 if (get_user(c, s)) 2456 return -EFAULT; 2457 if (!isspace(c)) 2458 break; 2459 left--; 2460 s++; 2461 } 2462 if (!left) 2463 break; 2464 neg = 0; 2465 len = left; 2466 if (len > TMPBUFLEN-1) 2467 len = TMPBUFLEN-1; 2468 if (copy_from_user(buf, s, len)) 2469 return -EFAULT; 2470 buf[len] = 0; 2471 p = buf; 2472 if (*p == '-' && left > 1) { 2473 neg = 1; 2474 p++; 2475 } 2476 if (*p < '0' || *p > '9') 2477 break; 2478 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 2479 len = p-buf; 2480 if ((len < left) && *p && !isspace(*p)) 2481 break; 2482 if (neg) 2483 val = -val; 2484 s += len; 2485 left -= len; 2486 2487 if(neg) 2488 continue; 2489 if ((min && val < *min) || (max && val > *max)) 2490 continue; 2491 *i = val; 2492 } else { 2493 p = buf; 2494 if (!first) 2495 *p++ = '\t'; 2496 sprintf(p, "%lu", convdiv * (*i) / convmul); 2497 len = strlen(buf); 2498 if (len > left) 2499 len = left; 2500 if(copy_to_user(s, buf, len)) 2501 return -EFAULT; 2502 left -= len; 2503 s += len; 2504 } 2505 } 2506 2507 if (!write && !first && left) { 2508 if(put_user('\n', s)) 2509 return -EFAULT; 2510 left--, s++; 2511 } 2512 if (write) { 2513 while (left) { 2514 char c; 2515 if (get_user(c, s++)) 2516 return -EFAULT; 2517 if (!isspace(c)) 2518 break; 2519 left--; 2520 } 2521 } 2522 if (write && first) 2523 return -EINVAL; 2524 *lenp -= left; 2525 *ppos += *lenp; 2526 return 0; 2527 #undef TMPBUFLEN 2528 } 2529 2530 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2531 struct file *filp, 2532 void __user *buffer, 2533 size_t *lenp, loff_t *ppos, 2534 unsigned long convmul, 2535 unsigned long convdiv) 2536 { 2537 return __do_proc_doulongvec_minmax(table->data, table, write, 2538 filp, buffer, lenp, ppos, convmul, convdiv); 2539 } 2540 2541 /** 2542 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2543 * @table: the sysctl table 2544 * @write: %TRUE if this is a write to the sysctl file 2545 * @filp: the file structure 2546 * @buffer: the user buffer 2547 * @lenp: the size of the user buffer 2548 * @ppos: file position 2549 * 2550 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2551 * values from/to the user buffer, treated as an ASCII string. 2552 * 2553 * This routine will ensure the values are within the range specified by 2554 * table->extra1 (min) and table->extra2 (max). 2555 * 2556 * Returns 0 on success. 2557 */ 2558 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2559 void __user *buffer, size_t *lenp, loff_t *ppos) 2560 { 2561 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2562 } 2563 2564 /** 2565 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2566 * @table: the sysctl table 2567 * @write: %TRUE if this is a write to the sysctl file 2568 * @filp: the file structure 2569 * @buffer: the user buffer 2570 * @lenp: the size of the user buffer 2571 * @ppos: file position 2572 * 2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2574 * values from/to the user buffer, treated as an ASCII string. The values 2575 * are treated as milliseconds, and converted to jiffies when they are stored. 2576 * 2577 * This routine will ensure the values are within the range specified by 2578 * table->extra1 (min) and table->extra2 (max). 2579 * 2580 * Returns 0 on success. 2581 */ 2582 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2583 struct file *filp, 2584 void __user *buffer, 2585 size_t *lenp, loff_t *ppos) 2586 { 2587 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2588 lenp, ppos, HZ, 1000l); 2589 } 2590 2591 2592 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2593 int *valp, 2594 int write, void *data) 2595 { 2596 if (write) { 2597 if (*lvalp > LONG_MAX / HZ) 2598 return 1; 2599 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2600 } else { 2601 int val = *valp; 2602 unsigned long lval; 2603 if (val < 0) { 2604 *negp = -1; 2605 lval = (unsigned long)-val; 2606 } else { 2607 *negp = 0; 2608 lval = (unsigned long)val; 2609 } 2610 *lvalp = lval / HZ; 2611 } 2612 return 0; 2613 } 2614 2615 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2616 int *valp, 2617 int write, void *data) 2618 { 2619 if (write) { 2620 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2621 return 1; 2622 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2623 } else { 2624 int val = *valp; 2625 unsigned long lval; 2626 if (val < 0) { 2627 *negp = -1; 2628 lval = (unsigned long)-val; 2629 } else { 2630 *negp = 0; 2631 lval = (unsigned long)val; 2632 } 2633 *lvalp = jiffies_to_clock_t(lval); 2634 } 2635 return 0; 2636 } 2637 2638 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2639 int *valp, 2640 int write, void *data) 2641 { 2642 if (write) { 2643 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2644 } else { 2645 int val = *valp; 2646 unsigned long lval; 2647 if (val < 0) { 2648 *negp = -1; 2649 lval = (unsigned long)-val; 2650 } else { 2651 *negp = 0; 2652 lval = (unsigned long)val; 2653 } 2654 *lvalp = jiffies_to_msecs(lval); 2655 } 2656 return 0; 2657 } 2658 2659 /** 2660 * proc_dointvec_jiffies - read a vector of integers as seconds 2661 * @table: the sysctl table 2662 * @write: %TRUE if this is a write to the sysctl file 2663 * @filp: the file structure 2664 * @buffer: the user buffer 2665 * @lenp: the size of the user buffer 2666 * @ppos: file position 2667 * 2668 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2669 * values from/to the user buffer, treated as an ASCII string. 2670 * The values read are assumed to be in seconds, and are converted into 2671 * jiffies. 2672 * 2673 * Returns 0 on success. 2674 */ 2675 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2676 void __user *buffer, size_t *lenp, loff_t *ppos) 2677 { 2678 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2679 do_proc_dointvec_jiffies_conv,NULL); 2680 } 2681 2682 /** 2683 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2684 * @table: the sysctl table 2685 * @write: %TRUE if this is a write to the sysctl file 2686 * @filp: the file structure 2687 * @buffer: the user buffer 2688 * @lenp: the size of the user buffer 2689 * @ppos: pointer to the file position 2690 * 2691 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2692 * values from/to the user buffer, treated as an ASCII string. 2693 * The values read are assumed to be in 1/USER_HZ seconds, and 2694 * are converted into jiffies. 2695 * 2696 * Returns 0 on success. 2697 */ 2698 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2699 void __user *buffer, size_t *lenp, loff_t *ppos) 2700 { 2701 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2702 do_proc_dointvec_userhz_jiffies_conv,NULL); 2703 } 2704 2705 /** 2706 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2707 * @table: the sysctl table 2708 * @write: %TRUE if this is a write to the sysctl file 2709 * @filp: the file structure 2710 * @buffer: the user buffer 2711 * @lenp: the size of the user buffer 2712 * @ppos: file position 2713 * @ppos: the current position in the file 2714 * 2715 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2716 * values from/to the user buffer, treated as an ASCII string. 2717 * The values read are assumed to be in 1/1000 seconds, and 2718 * are converted into jiffies. 2719 * 2720 * Returns 0 on success. 2721 */ 2722 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2723 void __user *buffer, size_t *lenp, loff_t *ppos) 2724 { 2725 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2726 do_proc_dointvec_ms_jiffies_conv, NULL); 2727 } 2728 2729 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp, 2730 void __user *buffer, size_t *lenp, loff_t *ppos) 2731 { 2732 struct pid *new_pid; 2733 pid_t tmp; 2734 int r; 2735 2736 tmp = pid_vnr(cad_pid); 2737 2738 r = __do_proc_dointvec(&tmp, table, write, filp, buffer, 2739 lenp, ppos, NULL, NULL); 2740 if (r || !write) 2741 return r; 2742 2743 new_pid = find_get_pid(tmp); 2744 if (!new_pid) 2745 return -ESRCH; 2746 2747 put_pid(xchg(&cad_pid, new_pid)); 2748 return 0; 2749 } 2750 2751 #else /* CONFIG_PROC_FS */ 2752 2753 int proc_dostring(struct ctl_table *table, int write, struct file *filp, 2754 void __user *buffer, size_t *lenp, loff_t *ppos) 2755 { 2756 return -ENOSYS; 2757 } 2758 2759 int proc_dointvec(struct ctl_table *table, int write, struct file *filp, 2760 void __user *buffer, size_t *lenp, loff_t *ppos) 2761 { 2762 return -ENOSYS; 2763 } 2764 2765 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp, 2766 void __user *buffer, size_t *lenp, loff_t *ppos) 2767 { 2768 return -ENOSYS; 2769 } 2770 2771 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp, 2772 void __user *buffer, size_t *lenp, loff_t *ppos) 2773 { 2774 return -ENOSYS; 2775 } 2776 2777 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp, 2778 void __user *buffer, size_t *lenp, loff_t *ppos) 2779 { 2780 return -ENOSYS; 2781 } 2782 2783 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp, 2784 void __user *buffer, size_t *lenp, loff_t *ppos) 2785 { 2786 return -ENOSYS; 2787 } 2788 2789 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp, 2790 void __user *buffer, size_t *lenp, loff_t *ppos) 2791 { 2792 return -ENOSYS; 2793 } 2794 2795 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2796 struct file *filp, 2797 void __user *buffer, 2798 size_t *lenp, loff_t *ppos) 2799 { 2800 return -ENOSYS; 2801 } 2802 2803 2804 #endif /* CONFIG_PROC_FS */ 2805 2806 2807 #ifdef CONFIG_SYSCTL_SYSCALL 2808 /* 2809 * General sysctl support routines 2810 */ 2811 2812 /* The generic sysctl data routine (used if no strategy routine supplied) */ 2813 int sysctl_data(struct ctl_table *table, 2814 void __user *oldval, size_t __user *oldlenp, 2815 void __user *newval, size_t newlen) 2816 { 2817 size_t len; 2818 2819 /* Get out of I don't have a variable */ 2820 if (!table->data || !table->maxlen) 2821 return -ENOTDIR; 2822 2823 if (oldval && oldlenp) { 2824 if (get_user(len, oldlenp)) 2825 return -EFAULT; 2826 if (len) { 2827 if (len > table->maxlen) 2828 len = table->maxlen; 2829 if (copy_to_user(oldval, table->data, len)) 2830 return -EFAULT; 2831 if (put_user(len, oldlenp)) 2832 return -EFAULT; 2833 } 2834 } 2835 2836 if (newval && newlen) { 2837 if (newlen > table->maxlen) 2838 newlen = table->maxlen; 2839 2840 if (copy_from_user(table->data, newval, newlen)) 2841 return -EFAULT; 2842 } 2843 return 1; 2844 } 2845 2846 /* The generic string strategy routine: */ 2847 int sysctl_string(struct ctl_table *table, 2848 void __user *oldval, size_t __user *oldlenp, 2849 void __user *newval, size_t newlen) 2850 { 2851 if (!table->data || !table->maxlen) 2852 return -ENOTDIR; 2853 2854 if (oldval && oldlenp) { 2855 size_t bufsize; 2856 if (get_user(bufsize, oldlenp)) 2857 return -EFAULT; 2858 if (bufsize) { 2859 size_t len = strlen(table->data), copied; 2860 2861 /* This shouldn't trigger for a well-formed sysctl */ 2862 if (len > table->maxlen) 2863 len = table->maxlen; 2864 2865 /* Copy up to a max of bufsize-1 bytes of the string */ 2866 copied = (len >= bufsize) ? bufsize - 1 : len; 2867 2868 if (copy_to_user(oldval, table->data, copied) || 2869 put_user(0, (char __user *)(oldval + copied))) 2870 return -EFAULT; 2871 if (put_user(len, oldlenp)) 2872 return -EFAULT; 2873 } 2874 } 2875 if (newval && newlen) { 2876 size_t len = newlen; 2877 if (len > table->maxlen) 2878 len = table->maxlen; 2879 if(copy_from_user(table->data, newval, len)) 2880 return -EFAULT; 2881 if (len == table->maxlen) 2882 len--; 2883 ((char *) table->data)[len] = 0; 2884 } 2885 return 1; 2886 } 2887 2888 /* 2889 * This function makes sure that all of the integers in the vector 2890 * are between the minimum and maximum values given in the arrays 2891 * table->extra1 and table->extra2, respectively. 2892 */ 2893 int sysctl_intvec(struct ctl_table *table, 2894 void __user *oldval, size_t __user *oldlenp, 2895 void __user *newval, size_t newlen) 2896 { 2897 2898 if (newval && newlen) { 2899 int __user *vec = (int __user *) newval; 2900 int *min = (int *) table->extra1; 2901 int *max = (int *) table->extra2; 2902 size_t length; 2903 int i; 2904 2905 if (newlen % sizeof(int) != 0) 2906 return -EINVAL; 2907 2908 if (!table->extra1 && !table->extra2) 2909 return 0; 2910 2911 if (newlen > table->maxlen) 2912 newlen = table->maxlen; 2913 length = newlen / sizeof(int); 2914 2915 for (i = 0; i < length; i++) { 2916 int value; 2917 if (get_user(value, vec + i)) 2918 return -EFAULT; 2919 if (min && value < min[i]) 2920 return -EINVAL; 2921 if (max && value > max[i]) 2922 return -EINVAL; 2923 } 2924 } 2925 return 0; 2926 } 2927 2928 /* Strategy function to convert jiffies to seconds */ 2929 int sysctl_jiffies(struct ctl_table *table, 2930 void __user *oldval, size_t __user *oldlenp, 2931 void __user *newval, size_t newlen) 2932 { 2933 if (oldval && oldlenp) { 2934 size_t olen; 2935 2936 if (get_user(olen, oldlenp)) 2937 return -EFAULT; 2938 if (olen) { 2939 int val; 2940 2941 if (olen < sizeof(int)) 2942 return -EINVAL; 2943 2944 val = *(int *)(table->data) / HZ; 2945 if (put_user(val, (int __user *)oldval)) 2946 return -EFAULT; 2947 if (put_user(sizeof(int), oldlenp)) 2948 return -EFAULT; 2949 } 2950 } 2951 if (newval && newlen) { 2952 int new; 2953 if (newlen != sizeof(int)) 2954 return -EINVAL; 2955 if (get_user(new, (int __user *)newval)) 2956 return -EFAULT; 2957 *(int *)(table->data) = new*HZ; 2958 } 2959 return 1; 2960 } 2961 2962 /* Strategy function to convert jiffies to seconds */ 2963 int sysctl_ms_jiffies(struct ctl_table *table, 2964 void __user *oldval, size_t __user *oldlenp, 2965 void __user *newval, size_t newlen) 2966 { 2967 if (oldval && oldlenp) { 2968 size_t olen; 2969 2970 if (get_user(olen, oldlenp)) 2971 return -EFAULT; 2972 if (olen) { 2973 int val; 2974 2975 if (olen < sizeof(int)) 2976 return -EINVAL; 2977 2978 val = jiffies_to_msecs(*(int *)(table->data)); 2979 if (put_user(val, (int __user *)oldval)) 2980 return -EFAULT; 2981 if (put_user(sizeof(int), oldlenp)) 2982 return -EFAULT; 2983 } 2984 } 2985 if (newval && newlen) { 2986 int new; 2987 if (newlen != sizeof(int)) 2988 return -EINVAL; 2989 if (get_user(new, (int __user *)newval)) 2990 return -EFAULT; 2991 *(int *)(table->data) = msecs_to_jiffies(new); 2992 } 2993 return 1; 2994 } 2995 2996 2997 2998 #else /* CONFIG_SYSCTL_SYSCALL */ 2999 3000 3001 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args) 3002 { 3003 struct __sysctl_args tmp; 3004 int error; 3005 3006 if (copy_from_user(&tmp, args, sizeof(tmp))) 3007 return -EFAULT; 3008 3009 error = deprecated_sysctl_warning(&tmp); 3010 3011 /* If no error reading the parameters then just -ENOSYS ... */ 3012 if (!error) 3013 error = -ENOSYS; 3014 3015 return error; 3016 } 3017 3018 int sysctl_data(struct ctl_table *table, 3019 void __user *oldval, size_t __user *oldlenp, 3020 void __user *newval, size_t newlen) 3021 { 3022 return -ENOSYS; 3023 } 3024 3025 int sysctl_string(struct ctl_table *table, 3026 void __user *oldval, size_t __user *oldlenp, 3027 void __user *newval, size_t newlen) 3028 { 3029 return -ENOSYS; 3030 } 3031 3032 int sysctl_intvec(struct ctl_table *table, 3033 void __user *oldval, size_t __user *oldlenp, 3034 void __user *newval, size_t newlen) 3035 { 3036 return -ENOSYS; 3037 } 3038 3039 int sysctl_jiffies(struct ctl_table *table, 3040 void __user *oldval, size_t __user *oldlenp, 3041 void __user *newval, size_t newlen) 3042 { 3043 return -ENOSYS; 3044 } 3045 3046 int sysctl_ms_jiffies(struct ctl_table *table, 3047 void __user *oldval, size_t __user *oldlenp, 3048 void __user *newval, size_t newlen) 3049 { 3050 return -ENOSYS; 3051 } 3052 3053 #endif /* CONFIG_SYSCTL_SYSCALL */ 3054 3055 static int deprecated_sysctl_warning(struct __sysctl_args *args) 3056 { 3057 static int msg_count; 3058 int name[CTL_MAXNAME]; 3059 int i; 3060 3061 /* Check args->nlen. */ 3062 if (args->nlen < 0 || args->nlen > CTL_MAXNAME) 3063 return -ENOTDIR; 3064 3065 /* Read in the sysctl name for better debug message logging */ 3066 for (i = 0; i < args->nlen; i++) 3067 if (get_user(name[i], args->name + i)) 3068 return -EFAULT; 3069 3070 /* Ignore accesses to kernel.version */ 3071 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION)) 3072 return 0; 3073 3074 if (msg_count < 5) { 3075 msg_count++; 3076 printk(KERN_INFO 3077 "warning: process `%s' used the deprecated sysctl " 3078 "system call with ", current->comm); 3079 for (i = 0; i < args->nlen; i++) 3080 printk("%d.", name[i]); 3081 printk("\n"); 3082 } 3083 return 0; 3084 } 3085 3086 /* 3087 * No sense putting this after each symbol definition, twice, 3088 * exception granted :-) 3089 */ 3090 EXPORT_SYMBOL(proc_dointvec); 3091 EXPORT_SYMBOL(proc_dointvec_jiffies); 3092 EXPORT_SYMBOL(proc_dointvec_minmax); 3093 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3094 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3095 EXPORT_SYMBOL(proc_dostring); 3096 EXPORT_SYMBOL(proc_doulongvec_minmax); 3097 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3098 EXPORT_SYMBOL(register_sysctl_table); 3099 EXPORT_SYMBOL(register_sysctl_paths); 3100 EXPORT_SYMBOL(sysctl_intvec); 3101 EXPORT_SYMBOL(sysctl_jiffies); 3102 EXPORT_SYMBOL(sysctl_ms_jiffies); 3103 EXPORT_SYMBOL(sysctl_string); 3104 EXPORT_SYMBOL(sysctl_data); 3105 EXPORT_SYMBOL(unregister_sysctl_table); 3106