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