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