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/aio.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/bitmap.h> 28 #include <linux/signal.h> 29 #include <linux/printk.h> 30 #include <linux/proc_fs.h> 31 #include <linux/security.h> 32 #include <linux/ctype.h> 33 #include <linux/kmemcheck.h> 34 #include <linux/kmemleak.h> 35 #include <linux/fs.h> 36 #include <linux/init.h> 37 #include <linux/kernel.h> 38 #include <linux/kobject.h> 39 #include <linux/net.h> 40 #include <linux/sysrq.h> 41 #include <linux/highuid.h> 42 #include <linux/writeback.h> 43 #include <linux/ratelimit.h> 44 #include <linux/compaction.h> 45 #include <linux/hugetlb.h> 46 #include <linux/initrd.h> 47 #include <linux/key.h> 48 #include <linux/times.h> 49 #include <linux/limits.h> 50 #include <linux/dcache.h> 51 #include <linux/dnotify.h> 52 #include <linux/syscalls.h> 53 #include <linux/vmstat.h> 54 #include <linux/nfs_fs.h> 55 #include <linux/acpi.h> 56 #include <linux/reboot.h> 57 #include <linux/ftrace.h> 58 #include <linux/perf_event.h> 59 #include <linux/kprobes.h> 60 #include <linux/pipe_fs_i.h> 61 #include <linux/oom.h> 62 #include <linux/kmod.h> 63 #include <linux/capability.h> 64 #include <linux/binfmts.h> 65 #include <linux/sched/sysctl.h> 66 #include <linux/sched/coredump.h> 67 #include <linux/kexec.h> 68 #include <linux/bpf.h> 69 #include <linux/mount.h> 70 71 #include <linux/uaccess.h> 72 #include <asm/processor.h> 73 74 #ifdef CONFIG_X86 75 #include <asm/nmi.h> 76 #include <asm/stacktrace.h> 77 #include <asm/io.h> 78 #endif 79 #ifdef CONFIG_SPARC 80 #include <asm/setup.h> 81 #endif 82 #ifdef CONFIG_BSD_PROCESS_ACCT 83 #include <linux/acct.h> 84 #endif 85 #ifdef CONFIG_RT_MUTEXES 86 #include <linux/rtmutex.h> 87 #endif 88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 89 #include <linux/lockdep.h> 90 #endif 91 #ifdef CONFIG_CHR_DEV_SG 92 #include <scsi/sg.h> 93 #endif 94 95 #ifdef CONFIG_LOCKUP_DETECTOR 96 #include <linux/nmi.h> 97 #endif 98 99 #if defined(CONFIG_SYSCTL) 100 101 /* External variables not in a header file. */ 102 extern int suid_dumpable; 103 #ifdef CONFIG_COREDUMP 104 extern int core_uses_pid; 105 extern char core_pattern[]; 106 extern unsigned int core_pipe_limit; 107 #endif 108 extern int pid_max; 109 extern int pid_max_min, pid_max_max; 110 extern int percpu_pagelist_fraction; 111 extern int latencytop_enabled; 112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; 113 #ifndef CONFIG_MMU 114 extern int sysctl_nr_trim_pages; 115 #endif 116 117 /* Constants used for minimum and maximum */ 118 #ifdef CONFIG_LOCKUP_DETECTOR 119 static int sixty = 60; 120 #endif 121 122 static int __maybe_unused neg_one = -1; 123 124 static int zero; 125 static int __maybe_unused one = 1; 126 static int __maybe_unused two = 2; 127 static int __maybe_unused four = 4; 128 static unsigned long one_ul = 1; 129 static int one_hundred = 100; 130 static int one_thousand = 1000; 131 #ifdef CONFIG_PRINTK 132 static int ten_thousand = 10000; 133 #endif 134 #ifdef CONFIG_PERF_EVENTS 135 static int six_hundred_forty_kb = 640 * 1024; 136 #endif 137 138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 140 141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 142 static int maxolduid = 65535; 143 static int minolduid; 144 145 static int ngroups_max = NGROUPS_MAX; 146 static const int cap_last_cap = CAP_LAST_CAP; 147 148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 149 #ifdef CONFIG_DETECT_HUNG_TASK 150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 151 #endif 152 153 #ifdef CONFIG_INOTIFY_USER 154 #include <linux/inotify.h> 155 #endif 156 #ifdef CONFIG_SPARC 157 #endif 158 159 #ifdef __hppa__ 160 extern int pwrsw_enabled; 161 #endif 162 163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 164 extern int unaligned_enabled; 165 #endif 166 167 #ifdef CONFIG_IA64 168 extern int unaligned_dump_stack; 169 #endif 170 171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 172 extern int no_unaligned_warning; 173 #endif 174 175 #ifdef CONFIG_PROC_SYSCTL 176 177 /** 178 * enum sysctl_writes_mode - supported sysctl write modes 179 * 180 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value 181 * to be written, and multiple writes on the same sysctl file descriptor 182 * will rewrite the sysctl value, regardless of file position. No warning 183 * is issued when the initial position is not 0. 184 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is 185 * not 0. 186 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at 187 * file position 0 and the value must be fully contained in the buffer 188 * sent to the write syscall. If dealing with strings respect the file 189 * position, but restrict this to the max length of the buffer, anything 190 * passed the max lenght will be ignored. Multiple writes will append 191 * to the buffer. 192 * 193 * These write modes control how current file position affects the behavior of 194 * updating sysctl values through the proc interface on each write. 195 */ 196 enum sysctl_writes_mode { 197 SYSCTL_WRITES_LEGACY = -1, 198 SYSCTL_WRITES_WARN = 0, 199 SYSCTL_WRITES_STRICT = 1, 200 }; 201 202 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; 203 204 static int proc_do_cad_pid(struct ctl_table *table, int write, 205 void __user *buffer, size_t *lenp, loff_t *ppos); 206 static int proc_taint(struct ctl_table *table, int write, 207 void __user *buffer, size_t *lenp, loff_t *ppos); 208 #endif 209 210 #ifdef CONFIG_PRINTK 211 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 212 void __user *buffer, size_t *lenp, loff_t *ppos); 213 #endif 214 215 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 216 void __user *buffer, size_t *lenp, loff_t *ppos); 217 #ifdef CONFIG_COREDUMP 218 static int proc_dostring_coredump(struct ctl_table *table, int write, 219 void __user *buffer, size_t *lenp, loff_t *ppos); 220 #endif 221 222 #ifdef CONFIG_MAGIC_SYSRQ 223 /* Note: sysrq code uses it's own private copy */ 224 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 225 226 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 227 void __user *buffer, size_t *lenp, 228 loff_t *ppos) 229 { 230 int error; 231 232 error = proc_dointvec(table, write, buffer, lenp, ppos); 233 if (error) 234 return error; 235 236 if (write) 237 sysrq_toggle_support(__sysrq_enabled); 238 239 return 0; 240 } 241 242 #endif 243 244 static struct ctl_table kern_table[]; 245 static struct ctl_table vm_table[]; 246 static struct ctl_table fs_table[]; 247 static struct ctl_table debug_table[]; 248 static struct ctl_table dev_table[]; 249 extern struct ctl_table random_table[]; 250 #ifdef CONFIG_EPOLL 251 extern struct ctl_table epoll_table[]; 252 #endif 253 254 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 255 int sysctl_legacy_va_layout; 256 #endif 257 258 /* The default sysctl tables: */ 259 260 static struct ctl_table sysctl_base_table[] = { 261 { 262 .procname = "kernel", 263 .mode = 0555, 264 .child = kern_table, 265 }, 266 { 267 .procname = "vm", 268 .mode = 0555, 269 .child = vm_table, 270 }, 271 { 272 .procname = "fs", 273 .mode = 0555, 274 .child = fs_table, 275 }, 276 { 277 .procname = "debug", 278 .mode = 0555, 279 .child = debug_table, 280 }, 281 { 282 .procname = "dev", 283 .mode = 0555, 284 .child = dev_table, 285 }, 286 { } 287 }; 288 289 #ifdef CONFIG_SCHED_DEBUG 290 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 291 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 292 static int min_wakeup_granularity_ns; /* 0 usecs */ 293 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 294 #ifdef CONFIG_SMP 295 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 296 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 297 #endif /* CONFIG_SMP */ 298 #endif /* CONFIG_SCHED_DEBUG */ 299 300 #ifdef CONFIG_COMPACTION 301 static int min_extfrag_threshold; 302 static int max_extfrag_threshold = 1000; 303 #endif 304 305 static struct ctl_table kern_table[] = { 306 { 307 .procname = "sched_child_runs_first", 308 .data = &sysctl_sched_child_runs_first, 309 .maxlen = sizeof(unsigned int), 310 .mode = 0644, 311 .proc_handler = proc_dointvec, 312 }, 313 #ifdef CONFIG_SCHED_DEBUG 314 { 315 .procname = "sched_min_granularity_ns", 316 .data = &sysctl_sched_min_granularity, 317 .maxlen = sizeof(unsigned int), 318 .mode = 0644, 319 .proc_handler = sched_proc_update_handler, 320 .extra1 = &min_sched_granularity_ns, 321 .extra2 = &max_sched_granularity_ns, 322 }, 323 { 324 .procname = "sched_latency_ns", 325 .data = &sysctl_sched_latency, 326 .maxlen = sizeof(unsigned int), 327 .mode = 0644, 328 .proc_handler = sched_proc_update_handler, 329 .extra1 = &min_sched_granularity_ns, 330 .extra2 = &max_sched_granularity_ns, 331 }, 332 { 333 .procname = "sched_wakeup_granularity_ns", 334 .data = &sysctl_sched_wakeup_granularity, 335 .maxlen = sizeof(unsigned int), 336 .mode = 0644, 337 .proc_handler = sched_proc_update_handler, 338 .extra1 = &min_wakeup_granularity_ns, 339 .extra2 = &max_wakeup_granularity_ns, 340 }, 341 #ifdef CONFIG_SMP 342 { 343 .procname = "sched_tunable_scaling", 344 .data = &sysctl_sched_tunable_scaling, 345 .maxlen = sizeof(enum sched_tunable_scaling), 346 .mode = 0644, 347 .proc_handler = sched_proc_update_handler, 348 .extra1 = &min_sched_tunable_scaling, 349 .extra2 = &max_sched_tunable_scaling, 350 }, 351 { 352 .procname = "sched_migration_cost_ns", 353 .data = &sysctl_sched_migration_cost, 354 .maxlen = sizeof(unsigned int), 355 .mode = 0644, 356 .proc_handler = proc_dointvec, 357 }, 358 { 359 .procname = "sched_nr_migrate", 360 .data = &sysctl_sched_nr_migrate, 361 .maxlen = sizeof(unsigned int), 362 .mode = 0644, 363 .proc_handler = proc_dointvec, 364 }, 365 { 366 .procname = "sched_time_avg_ms", 367 .data = &sysctl_sched_time_avg, 368 .maxlen = sizeof(unsigned int), 369 .mode = 0644, 370 .proc_handler = proc_dointvec, 371 }, 372 #ifdef CONFIG_SCHEDSTATS 373 { 374 .procname = "sched_schedstats", 375 .data = NULL, 376 .maxlen = sizeof(unsigned int), 377 .mode = 0644, 378 .proc_handler = sysctl_schedstats, 379 .extra1 = &zero, 380 .extra2 = &one, 381 }, 382 #endif /* CONFIG_SCHEDSTATS */ 383 #endif /* CONFIG_SMP */ 384 #ifdef CONFIG_NUMA_BALANCING 385 { 386 .procname = "numa_balancing_scan_delay_ms", 387 .data = &sysctl_numa_balancing_scan_delay, 388 .maxlen = sizeof(unsigned int), 389 .mode = 0644, 390 .proc_handler = proc_dointvec, 391 }, 392 { 393 .procname = "numa_balancing_scan_period_min_ms", 394 .data = &sysctl_numa_balancing_scan_period_min, 395 .maxlen = sizeof(unsigned int), 396 .mode = 0644, 397 .proc_handler = proc_dointvec, 398 }, 399 { 400 .procname = "numa_balancing_scan_period_max_ms", 401 .data = &sysctl_numa_balancing_scan_period_max, 402 .maxlen = sizeof(unsigned int), 403 .mode = 0644, 404 .proc_handler = proc_dointvec, 405 }, 406 { 407 .procname = "numa_balancing_scan_size_mb", 408 .data = &sysctl_numa_balancing_scan_size, 409 .maxlen = sizeof(unsigned int), 410 .mode = 0644, 411 .proc_handler = proc_dointvec_minmax, 412 .extra1 = &one, 413 }, 414 { 415 .procname = "numa_balancing", 416 .data = NULL, /* filled in by handler */ 417 .maxlen = sizeof(unsigned int), 418 .mode = 0644, 419 .proc_handler = sysctl_numa_balancing, 420 .extra1 = &zero, 421 .extra2 = &one, 422 }, 423 #endif /* CONFIG_NUMA_BALANCING */ 424 #endif /* CONFIG_SCHED_DEBUG */ 425 { 426 .procname = "sched_rt_period_us", 427 .data = &sysctl_sched_rt_period, 428 .maxlen = sizeof(unsigned int), 429 .mode = 0644, 430 .proc_handler = sched_rt_handler, 431 }, 432 { 433 .procname = "sched_rt_runtime_us", 434 .data = &sysctl_sched_rt_runtime, 435 .maxlen = sizeof(int), 436 .mode = 0644, 437 .proc_handler = sched_rt_handler, 438 }, 439 { 440 .procname = "sched_rr_timeslice_ms", 441 .data = &sysctl_sched_rr_timeslice, 442 .maxlen = sizeof(int), 443 .mode = 0644, 444 .proc_handler = sched_rr_handler, 445 }, 446 #ifdef CONFIG_SCHED_AUTOGROUP 447 { 448 .procname = "sched_autogroup_enabled", 449 .data = &sysctl_sched_autogroup_enabled, 450 .maxlen = sizeof(unsigned int), 451 .mode = 0644, 452 .proc_handler = proc_dointvec_minmax, 453 .extra1 = &zero, 454 .extra2 = &one, 455 }, 456 #endif 457 #ifdef CONFIG_CFS_BANDWIDTH 458 { 459 .procname = "sched_cfs_bandwidth_slice_us", 460 .data = &sysctl_sched_cfs_bandwidth_slice, 461 .maxlen = sizeof(unsigned int), 462 .mode = 0644, 463 .proc_handler = proc_dointvec_minmax, 464 .extra1 = &one, 465 }, 466 #endif 467 #ifdef CONFIG_PROVE_LOCKING 468 { 469 .procname = "prove_locking", 470 .data = &prove_locking, 471 .maxlen = sizeof(int), 472 .mode = 0644, 473 .proc_handler = proc_dointvec, 474 }, 475 #endif 476 #ifdef CONFIG_LOCK_STAT 477 { 478 .procname = "lock_stat", 479 .data = &lock_stat, 480 .maxlen = sizeof(int), 481 .mode = 0644, 482 .proc_handler = proc_dointvec, 483 }, 484 #endif 485 { 486 .procname = "panic", 487 .data = &panic_timeout, 488 .maxlen = sizeof(int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec, 491 }, 492 #ifdef CONFIG_COREDUMP 493 { 494 .procname = "core_uses_pid", 495 .data = &core_uses_pid, 496 .maxlen = sizeof(int), 497 .mode = 0644, 498 .proc_handler = proc_dointvec, 499 }, 500 { 501 .procname = "core_pattern", 502 .data = core_pattern, 503 .maxlen = CORENAME_MAX_SIZE, 504 .mode = 0644, 505 .proc_handler = proc_dostring_coredump, 506 }, 507 { 508 .procname = "core_pipe_limit", 509 .data = &core_pipe_limit, 510 .maxlen = sizeof(unsigned int), 511 .mode = 0644, 512 .proc_handler = proc_dointvec, 513 }, 514 #endif 515 #ifdef CONFIG_PROC_SYSCTL 516 { 517 .procname = "tainted", 518 .maxlen = sizeof(long), 519 .mode = 0644, 520 .proc_handler = proc_taint, 521 }, 522 { 523 .procname = "sysctl_writes_strict", 524 .data = &sysctl_writes_strict, 525 .maxlen = sizeof(int), 526 .mode = 0644, 527 .proc_handler = proc_dointvec_minmax, 528 .extra1 = &neg_one, 529 .extra2 = &one, 530 }, 531 #endif 532 #ifdef CONFIG_LATENCYTOP 533 { 534 .procname = "latencytop", 535 .data = &latencytop_enabled, 536 .maxlen = sizeof(int), 537 .mode = 0644, 538 .proc_handler = sysctl_latencytop, 539 }, 540 #endif 541 #ifdef CONFIG_BLK_DEV_INITRD 542 { 543 .procname = "real-root-dev", 544 .data = &real_root_dev, 545 .maxlen = sizeof(int), 546 .mode = 0644, 547 .proc_handler = proc_dointvec, 548 }, 549 #endif 550 { 551 .procname = "print-fatal-signals", 552 .data = &print_fatal_signals, 553 .maxlen = sizeof(int), 554 .mode = 0644, 555 .proc_handler = proc_dointvec, 556 }, 557 #ifdef CONFIG_SPARC 558 { 559 .procname = "reboot-cmd", 560 .data = reboot_command, 561 .maxlen = 256, 562 .mode = 0644, 563 .proc_handler = proc_dostring, 564 }, 565 { 566 .procname = "stop-a", 567 .data = &stop_a_enabled, 568 .maxlen = sizeof (int), 569 .mode = 0644, 570 .proc_handler = proc_dointvec, 571 }, 572 { 573 .procname = "scons-poweroff", 574 .data = &scons_pwroff, 575 .maxlen = sizeof (int), 576 .mode = 0644, 577 .proc_handler = proc_dointvec, 578 }, 579 #endif 580 #ifdef CONFIG_SPARC64 581 { 582 .procname = "tsb-ratio", 583 .data = &sysctl_tsb_ratio, 584 .maxlen = sizeof (int), 585 .mode = 0644, 586 .proc_handler = proc_dointvec, 587 }, 588 #endif 589 #ifdef __hppa__ 590 { 591 .procname = "soft-power", 592 .data = &pwrsw_enabled, 593 .maxlen = sizeof (int), 594 .mode = 0644, 595 .proc_handler = proc_dointvec, 596 }, 597 #endif 598 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 599 { 600 .procname = "unaligned-trap", 601 .data = &unaligned_enabled, 602 .maxlen = sizeof (int), 603 .mode = 0644, 604 .proc_handler = proc_dointvec, 605 }, 606 #endif 607 { 608 .procname = "ctrl-alt-del", 609 .data = &C_A_D, 610 .maxlen = sizeof(int), 611 .mode = 0644, 612 .proc_handler = proc_dointvec, 613 }, 614 #ifdef CONFIG_FUNCTION_TRACER 615 { 616 .procname = "ftrace_enabled", 617 .data = &ftrace_enabled, 618 .maxlen = sizeof(int), 619 .mode = 0644, 620 .proc_handler = ftrace_enable_sysctl, 621 }, 622 #endif 623 #ifdef CONFIG_STACK_TRACER 624 { 625 .procname = "stack_tracer_enabled", 626 .data = &stack_tracer_enabled, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = stack_trace_sysctl, 630 }, 631 #endif 632 #ifdef CONFIG_TRACING 633 { 634 .procname = "ftrace_dump_on_oops", 635 .data = &ftrace_dump_on_oops, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec, 639 }, 640 { 641 .procname = "traceoff_on_warning", 642 .data = &__disable_trace_on_warning, 643 .maxlen = sizeof(__disable_trace_on_warning), 644 .mode = 0644, 645 .proc_handler = proc_dointvec, 646 }, 647 { 648 .procname = "tracepoint_printk", 649 .data = &tracepoint_printk, 650 .maxlen = sizeof(tracepoint_printk), 651 .mode = 0644, 652 .proc_handler = tracepoint_printk_sysctl, 653 }, 654 #endif 655 #ifdef CONFIG_KEXEC_CORE 656 { 657 .procname = "kexec_load_disabled", 658 .data = &kexec_load_disabled, 659 .maxlen = sizeof(int), 660 .mode = 0644, 661 /* only handle a transition from default "0" to "1" */ 662 .proc_handler = proc_dointvec_minmax, 663 .extra1 = &one, 664 .extra2 = &one, 665 }, 666 #endif 667 #ifdef CONFIG_MODULES 668 { 669 .procname = "modprobe", 670 .data = &modprobe_path, 671 .maxlen = KMOD_PATH_LEN, 672 .mode = 0644, 673 .proc_handler = proc_dostring, 674 }, 675 { 676 .procname = "modules_disabled", 677 .data = &modules_disabled, 678 .maxlen = sizeof(int), 679 .mode = 0644, 680 /* only handle a transition from default "0" to "1" */ 681 .proc_handler = proc_dointvec_minmax, 682 .extra1 = &one, 683 .extra2 = &one, 684 }, 685 #endif 686 #ifdef CONFIG_UEVENT_HELPER 687 { 688 .procname = "hotplug", 689 .data = &uevent_helper, 690 .maxlen = UEVENT_HELPER_PATH_LEN, 691 .mode = 0644, 692 .proc_handler = proc_dostring, 693 }, 694 #endif 695 #ifdef CONFIG_CHR_DEV_SG 696 { 697 .procname = "sg-big-buff", 698 .data = &sg_big_buff, 699 .maxlen = sizeof (int), 700 .mode = 0444, 701 .proc_handler = proc_dointvec, 702 }, 703 #endif 704 #ifdef CONFIG_BSD_PROCESS_ACCT 705 { 706 .procname = "acct", 707 .data = &acct_parm, 708 .maxlen = 3*sizeof(int), 709 .mode = 0644, 710 .proc_handler = proc_dointvec, 711 }, 712 #endif 713 #ifdef CONFIG_MAGIC_SYSRQ 714 { 715 .procname = "sysrq", 716 .data = &__sysrq_enabled, 717 .maxlen = sizeof (int), 718 .mode = 0644, 719 .proc_handler = sysrq_sysctl_handler, 720 }, 721 #endif 722 #ifdef CONFIG_PROC_SYSCTL 723 { 724 .procname = "cad_pid", 725 .data = NULL, 726 .maxlen = sizeof (int), 727 .mode = 0600, 728 .proc_handler = proc_do_cad_pid, 729 }, 730 #endif 731 { 732 .procname = "threads-max", 733 .data = NULL, 734 .maxlen = sizeof(int), 735 .mode = 0644, 736 .proc_handler = sysctl_max_threads, 737 }, 738 { 739 .procname = "random", 740 .mode = 0555, 741 .child = random_table, 742 }, 743 { 744 .procname = "usermodehelper", 745 .mode = 0555, 746 .child = usermodehelper_table, 747 }, 748 { 749 .procname = "overflowuid", 750 .data = &overflowuid, 751 .maxlen = sizeof(int), 752 .mode = 0644, 753 .proc_handler = proc_dointvec_minmax, 754 .extra1 = &minolduid, 755 .extra2 = &maxolduid, 756 }, 757 { 758 .procname = "overflowgid", 759 .data = &overflowgid, 760 .maxlen = sizeof(int), 761 .mode = 0644, 762 .proc_handler = proc_dointvec_minmax, 763 .extra1 = &minolduid, 764 .extra2 = &maxolduid, 765 }, 766 #ifdef CONFIG_S390 767 #ifdef CONFIG_MATHEMU 768 { 769 .procname = "ieee_emulation_warnings", 770 .data = &sysctl_ieee_emulation_warnings, 771 .maxlen = sizeof(int), 772 .mode = 0644, 773 .proc_handler = proc_dointvec, 774 }, 775 #endif 776 { 777 .procname = "userprocess_debug", 778 .data = &show_unhandled_signals, 779 .maxlen = sizeof(int), 780 .mode = 0644, 781 .proc_handler = proc_dointvec, 782 }, 783 #endif 784 { 785 .procname = "pid_max", 786 .data = &pid_max, 787 .maxlen = sizeof (int), 788 .mode = 0644, 789 .proc_handler = proc_dointvec_minmax, 790 .extra1 = &pid_max_min, 791 .extra2 = &pid_max_max, 792 }, 793 { 794 .procname = "panic_on_oops", 795 .data = &panic_on_oops, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec, 799 }, 800 #if defined CONFIG_PRINTK 801 { 802 .procname = "printk", 803 .data = &console_loglevel, 804 .maxlen = 4*sizeof(int), 805 .mode = 0644, 806 .proc_handler = proc_dointvec, 807 }, 808 { 809 .procname = "printk_ratelimit", 810 .data = &printk_ratelimit_state.interval, 811 .maxlen = sizeof(int), 812 .mode = 0644, 813 .proc_handler = proc_dointvec_jiffies, 814 }, 815 { 816 .procname = "printk_ratelimit_burst", 817 .data = &printk_ratelimit_state.burst, 818 .maxlen = sizeof(int), 819 .mode = 0644, 820 .proc_handler = proc_dointvec, 821 }, 822 { 823 .procname = "printk_delay", 824 .data = &printk_delay_msec, 825 .maxlen = sizeof(int), 826 .mode = 0644, 827 .proc_handler = proc_dointvec_minmax, 828 .extra1 = &zero, 829 .extra2 = &ten_thousand, 830 }, 831 { 832 .procname = "printk_devkmsg", 833 .data = devkmsg_log_str, 834 .maxlen = DEVKMSG_STR_MAX_SIZE, 835 .mode = 0644, 836 .proc_handler = devkmsg_sysctl_set_loglvl, 837 }, 838 { 839 .procname = "dmesg_restrict", 840 .data = &dmesg_restrict, 841 .maxlen = sizeof(int), 842 .mode = 0644, 843 .proc_handler = proc_dointvec_minmax_sysadmin, 844 .extra1 = &zero, 845 .extra2 = &one, 846 }, 847 { 848 .procname = "kptr_restrict", 849 .data = &kptr_restrict, 850 .maxlen = sizeof(int), 851 .mode = 0644, 852 .proc_handler = proc_dointvec_minmax_sysadmin, 853 .extra1 = &zero, 854 .extra2 = &two, 855 }, 856 #endif 857 { 858 .procname = "ngroups_max", 859 .data = &ngroups_max, 860 .maxlen = sizeof (int), 861 .mode = 0444, 862 .proc_handler = proc_dointvec, 863 }, 864 { 865 .procname = "cap_last_cap", 866 .data = (void *)&cap_last_cap, 867 .maxlen = sizeof(int), 868 .mode = 0444, 869 .proc_handler = proc_dointvec, 870 }, 871 #if defined(CONFIG_LOCKUP_DETECTOR) 872 { 873 .procname = "watchdog", 874 .data = &watchdog_user_enabled, 875 .maxlen = sizeof (int), 876 .mode = 0644, 877 .proc_handler = proc_watchdog, 878 .extra1 = &zero, 879 .extra2 = &one, 880 }, 881 { 882 .procname = "watchdog_thresh", 883 .data = &watchdog_thresh, 884 .maxlen = sizeof(int), 885 .mode = 0644, 886 .proc_handler = proc_watchdog_thresh, 887 .extra1 = &zero, 888 .extra2 = &sixty, 889 }, 890 { 891 .procname = "nmi_watchdog", 892 .data = &nmi_watchdog_enabled, 893 .maxlen = sizeof (int), 894 .mode = 0644, 895 .proc_handler = proc_nmi_watchdog, 896 .extra1 = &zero, 897 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) 898 .extra2 = &one, 899 #else 900 .extra2 = &zero, 901 #endif 902 }, 903 { 904 .procname = "soft_watchdog", 905 .data = &soft_watchdog_enabled, 906 .maxlen = sizeof (int), 907 .mode = 0644, 908 .proc_handler = proc_soft_watchdog, 909 .extra1 = &zero, 910 .extra2 = &one, 911 }, 912 { 913 .procname = "watchdog_cpumask", 914 .data = &watchdog_cpumask_bits, 915 .maxlen = NR_CPUS, 916 .mode = 0644, 917 .proc_handler = proc_watchdog_cpumask, 918 }, 919 { 920 .procname = "softlockup_panic", 921 .data = &softlockup_panic, 922 .maxlen = sizeof(int), 923 .mode = 0644, 924 .proc_handler = proc_dointvec_minmax, 925 .extra1 = &zero, 926 .extra2 = &one, 927 }, 928 #ifdef CONFIG_HARDLOCKUP_DETECTOR 929 { 930 .procname = "hardlockup_panic", 931 .data = &hardlockup_panic, 932 .maxlen = sizeof(int), 933 .mode = 0644, 934 .proc_handler = proc_dointvec_minmax, 935 .extra1 = &zero, 936 .extra2 = &one, 937 }, 938 #endif 939 #ifdef CONFIG_SMP 940 { 941 .procname = "softlockup_all_cpu_backtrace", 942 .data = &sysctl_softlockup_all_cpu_backtrace, 943 .maxlen = sizeof(int), 944 .mode = 0644, 945 .proc_handler = proc_dointvec_minmax, 946 .extra1 = &zero, 947 .extra2 = &one, 948 }, 949 { 950 .procname = "hardlockup_all_cpu_backtrace", 951 .data = &sysctl_hardlockup_all_cpu_backtrace, 952 .maxlen = sizeof(int), 953 .mode = 0644, 954 .proc_handler = proc_dointvec_minmax, 955 .extra1 = &zero, 956 .extra2 = &one, 957 }, 958 #endif /* CONFIG_SMP */ 959 #endif 960 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 961 { 962 .procname = "unknown_nmi_panic", 963 .data = &unknown_nmi_panic, 964 .maxlen = sizeof (int), 965 .mode = 0644, 966 .proc_handler = proc_dointvec, 967 }, 968 #endif 969 #if defined(CONFIG_X86) 970 { 971 .procname = "panic_on_unrecovered_nmi", 972 .data = &panic_on_unrecovered_nmi, 973 .maxlen = sizeof(int), 974 .mode = 0644, 975 .proc_handler = proc_dointvec, 976 }, 977 { 978 .procname = "panic_on_io_nmi", 979 .data = &panic_on_io_nmi, 980 .maxlen = sizeof(int), 981 .mode = 0644, 982 .proc_handler = proc_dointvec, 983 }, 984 #ifdef CONFIG_DEBUG_STACKOVERFLOW 985 { 986 .procname = "panic_on_stackoverflow", 987 .data = &sysctl_panic_on_stackoverflow, 988 .maxlen = sizeof(int), 989 .mode = 0644, 990 .proc_handler = proc_dointvec, 991 }, 992 #endif 993 { 994 .procname = "bootloader_type", 995 .data = &bootloader_type, 996 .maxlen = sizeof (int), 997 .mode = 0444, 998 .proc_handler = proc_dointvec, 999 }, 1000 { 1001 .procname = "bootloader_version", 1002 .data = &bootloader_version, 1003 .maxlen = sizeof (int), 1004 .mode = 0444, 1005 .proc_handler = proc_dointvec, 1006 }, 1007 { 1008 .procname = "io_delay_type", 1009 .data = &io_delay_type, 1010 .maxlen = sizeof(int), 1011 .mode = 0644, 1012 .proc_handler = proc_dointvec, 1013 }, 1014 #endif 1015 #if defined(CONFIG_MMU) 1016 { 1017 .procname = "randomize_va_space", 1018 .data = &randomize_va_space, 1019 .maxlen = sizeof(int), 1020 .mode = 0644, 1021 .proc_handler = proc_dointvec, 1022 }, 1023 #endif 1024 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1025 { 1026 .procname = "spin_retry", 1027 .data = &spin_retry, 1028 .maxlen = sizeof (int), 1029 .mode = 0644, 1030 .proc_handler = proc_dointvec, 1031 }, 1032 #endif 1033 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1034 { 1035 .procname = "acpi_video_flags", 1036 .data = &acpi_realmode_flags, 1037 .maxlen = sizeof (unsigned long), 1038 .mode = 0644, 1039 .proc_handler = proc_doulongvec_minmax, 1040 }, 1041 #endif 1042 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1043 { 1044 .procname = "ignore-unaligned-usertrap", 1045 .data = &no_unaligned_warning, 1046 .maxlen = sizeof (int), 1047 .mode = 0644, 1048 .proc_handler = proc_dointvec, 1049 }, 1050 #endif 1051 #ifdef CONFIG_IA64 1052 { 1053 .procname = "unaligned-dump-stack", 1054 .data = &unaligned_dump_stack, 1055 .maxlen = sizeof (int), 1056 .mode = 0644, 1057 .proc_handler = proc_dointvec, 1058 }, 1059 #endif 1060 #ifdef CONFIG_DETECT_HUNG_TASK 1061 { 1062 .procname = "hung_task_panic", 1063 .data = &sysctl_hung_task_panic, 1064 .maxlen = sizeof(int), 1065 .mode = 0644, 1066 .proc_handler = proc_dointvec_minmax, 1067 .extra1 = &zero, 1068 .extra2 = &one, 1069 }, 1070 { 1071 .procname = "hung_task_check_count", 1072 .data = &sysctl_hung_task_check_count, 1073 .maxlen = sizeof(int), 1074 .mode = 0644, 1075 .proc_handler = proc_dointvec_minmax, 1076 .extra1 = &zero, 1077 }, 1078 { 1079 .procname = "hung_task_timeout_secs", 1080 .data = &sysctl_hung_task_timeout_secs, 1081 .maxlen = sizeof(unsigned long), 1082 .mode = 0644, 1083 .proc_handler = proc_dohung_task_timeout_secs, 1084 .extra2 = &hung_task_timeout_max, 1085 }, 1086 { 1087 .procname = "hung_task_warnings", 1088 .data = &sysctl_hung_task_warnings, 1089 .maxlen = sizeof(int), 1090 .mode = 0644, 1091 .proc_handler = proc_dointvec_minmax, 1092 .extra1 = &neg_one, 1093 }, 1094 #endif 1095 #ifdef CONFIG_RT_MUTEXES 1096 { 1097 .procname = "max_lock_depth", 1098 .data = &max_lock_depth, 1099 .maxlen = sizeof(int), 1100 .mode = 0644, 1101 .proc_handler = proc_dointvec, 1102 }, 1103 #endif 1104 { 1105 .procname = "poweroff_cmd", 1106 .data = &poweroff_cmd, 1107 .maxlen = POWEROFF_CMD_PATH_LEN, 1108 .mode = 0644, 1109 .proc_handler = proc_dostring, 1110 }, 1111 #ifdef CONFIG_KEYS 1112 { 1113 .procname = "keys", 1114 .mode = 0555, 1115 .child = key_sysctls, 1116 }, 1117 #endif 1118 #ifdef CONFIG_PERF_EVENTS 1119 /* 1120 * User-space scripts rely on the existence of this file 1121 * as a feature check for perf_events being enabled. 1122 * 1123 * So it's an ABI, do not remove! 1124 */ 1125 { 1126 .procname = "perf_event_paranoid", 1127 .data = &sysctl_perf_event_paranoid, 1128 .maxlen = sizeof(sysctl_perf_event_paranoid), 1129 .mode = 0644, 1130 .proc_handler = proc_dointvec, 1131 }, 1132 { 1133 .procname = "perf_event_mlock_kb", 1134 .data = &sysctl_perf_event_mlock, 1135 .maxlen = sizeof(sysctl_perf_event_mlock), 1136 .mode = 0644, 1137 .proc_handler = proc_dointvec, 1138 }, 1139 { 1140 .procname = "perf_event_max_sample_rate", 1141 .data = &sysctl_perf_event_sample_rate, 1142 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1143 .mode = 0644, 1144 .proc_handler = perf_proc_update_handler, 1145 .extra1 = &one, 1146 }, 1147 { 1148 .procname = "perf_cpu_time_max_percent", 1149 .data = &sysctl_perf_cpu_time_max_percent, 1150 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1151 .mode = 0644, 1152 .proc_handler = perf_cpu_time_max_percent_handler, 1153 .extra1 = &zero, 1154 .extra2 = &one_hundred, 1155 }, 1156 { 1157 .procname = "perf_event_max_stack", 1158 .data = &sysctl_perf_event_max_stack, 1159 .maxlen = sizeof(sysctl_perf_event_max_stack), 1160 .mode = 0644, 1161 .proc_handler = perf_event_max_stack_handler, 1162 .extra1 = &zero, 1163 .extra2 = &six_hundred_forty_kb, 1164 }, 1165 { 1166 .procname = "perf_event_max_contexts_per_stack", 1167 .data = &sysctl_perf_event_max_contexts_per_stack, 1168 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1169 .mode = 0644, 1170 .proc_handler = perf_event_max_stack_handler, 1171 .extra1 = &zero, 1172 .extra2 = &one_thousand, 1173 }, 1174 #endif 1175 #ifdef CONFIG_KMEMCHECK 1176 { 1177 .procname = "kmemcheck", 1178 .data = &kmemcheck_enabled, 1179 .maxlen = sizeof(int), 1180 .mode = 0644, 1181 .proc_handler = proc_dointvec, 1182 }, 1183 #endif 1184 { 1185 .procname = "panic_on_warn", 1186 .data = &panic_on_warn, 1187 .maxlen = sizeof(int), 1188 .mode = 0644, 1189 .proc_handler = proc_dointvec_minmax, 1190 .extra1 = &zero, 1191 .extra2 = &one, 1192 }, 1193 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1194 { 1195 .procname = "timer_migration", 1196 .data = &sysctl_timer_migration, 1197 .maxlen = sizeof(unsigned int), 1198 .mode = 0644, 1199 .proc_handler = timer_migration_handler, 1200 .extra1 = &zero, 1201 .extra2 = &one, 1202 }, 1203 #endif 1204 #ifdef CONFIG_BPF_SYSCALL 1205 { 1206 .procname = "unprivileged_bpf_disabled", 1207 .data = &sysctl_unprivileged_bpf_disabled, 1208 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1209 .mode = 0644, 1210 /* only handle a transition from default "0" to "1" */ 1211 .proc_handler = proc_dointvec_minmax, 1212 .extra1 = &one, 1213 .extra2 = &one, 1214 }, 1215 #endif 1216 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1217 { 1218 .procname = "panic_on_rcu_stall", 1219 .data = &sysctl_panic_on_rcu_stall, 1220 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1221 .mode = 0644, 1222 .proc_handler = proc_dointvec_minmax, 1223 .extra1 = &zero, 1224 .extra2 = &one, 1225 }, 1226 #endif 1227 { } 1228 }; 1229 1230 static struct ctl_table vm_table[] = { 1231 { 1232 .procname = "overcommit_memory", 1233 .data = &sysctl_overcommit_memory, 1234 .maxlen = sizeof(sysctl_overcommit_memory), 1235 .mode = 0644, 1236 .proc_handler = proc_dointvec_minmax, 1237 .extra1 = &zero, 1238 .extra2 = &two, 1239 }, 1240 { 1241 .procname = "panic_on_oom", 1242 .data = &sysctl_panic_on_oom, 1243 .maxlen = sizeof(sysctl_panic_on_oom), 1244 .mode = 0644, 1245 .proc_handler = proc_dointvec_minmax, 1246 .extra1 = &zero, 1247 .extra2 = &two, 1248 }, 1249 { 1250 .procname = "oom_kill_allocating_task", 1251 .data = &sysctl_oom_kill_allocating_task, 1252 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec, 1255 }, 1256 { 1257 .procname = "oom_dump_tasks", 1258 .data = &sysctl_oom_dump_tasks, 1259 .maxlen = sizeof(sysctl_oom_dump_tasks), 1260 .mode = 0644, 1261 .proc_handler = proc_dointvec, 1262 }, 1263 { 1264 .procname = "overcommit_ratio", 1265 .data = &sysctl_overcommit_ratio, 1266 .maxlen = sizeof(sysctl_overcommit_ratio), 1267 .mode = 0644, 1268 .proc_handler = overcommit_ratio_handler, 1269 }, 1270 { 1271 .procname = "overcommit_kbytes", 1272 .data = &sysctl_overcommit_kbytes, 1273 .maxlen = sizeof(sysctl_overcommit_kbytes), 1274 .mode = 0644, 1275 .proc_handler = overcommit_kbytes_handler, 1276 }, 1277 { 1278 .procname = "page-cluster", 1279 .data = &page_cluster, 1280 .maxlen = sizeof(int), 1281 .mode = 0644, 1282 .proc_handler = proc_dointvec_minmax, 1283 .extra1 = &zero, 1284 }, 1285 { 1286 .procname = "dirty_background_ratio", 1287 .data = &dirty_background_ratio, 1288 .maxlen = sizeof(dirty_background_ratio), 1289 .mode = 0644, 1290 .proc_handler = dirty_background_ratio_handler, 1291 .extra1 = &zero, 1292 .extra2 = &one_hundred, 1293 }, 1294 { 1295 .procname = "dirty_background_bytes", 1296 .data = &dirty_background_bytes, 1297 .maxlen = sizeof(dirty_background_bytes), 1298 .mode = 0644, 1299 .proc_handler = dirty_background_bytes_handler, 1300 .extra1 = &one_ul, 1301 }, 1302 { 1303 .procname = "dirty_ratio", 1304 .data = &vm_dirty_ratio, 1305 .maxlen = sizeof(vm_dirty_ratio), 1306 .mode = 0644, 1307 .proc_handler = dirty_ratio_handler, 1308 .extra1 = &zero, 1309 .extra2 = &one_hundred, 1310 }, 1311 { 1312 .procname = "dirty_bytes", 1313 .data = &vm_dirty_bytes, 1314 .maxlen = sizeof(vm_dirty_bytes), 1315 .mode = 0644, 1316 .proc_handler = dirty_bytes_handler, 1317 .extra1 = &dirty_bytes_min, 1318 }, 1319 { 1320 .procname = "dirty_writeback_centisecs", 1321 .data = &dirty_writeback_interval, 1322 .maxlen = sizeof(dirty_writeback_interval), 1323 .mode = 0644, 1324 .proc_handler = dirty_writeback_centisecs_handler, 1325 }, 1326 { 1327 .procname = "dirty_expire_centisecs", 1328 .data = &dirty_expire_interval, 1329 .maxlen = sizeof(dirty_expire_interval), 1330 .mode = 0644, 1331 .proc_handler = proc_dointvec_minmax, 1332 .extra1 = &zero, 1333 }, 1334 { 1335 .procname = "dirtytime_expire_seconds", 1336 .data = &dirtytime_expire_interval, 1337 .maxlen = sizeof(dirty_expire_interval), 1338 .mode = 0644, 1339 .proc_handler = dirtytime_interval_handler, 1340 .extra1 = &zero, 1341 }, 1342 { 1343 .procname = "nr_pdflush_threads", 1344 .mode = 0444 /* read-only */, 1345 .proc_handler = pdflush_proc_obsolete, 1346 }, 1347 { 1348 .procname = "swappiness", 1349 .data = &vm_swappiness, 1350 .maxlen = sizeof(vm_swappiness), 1351 .mode = 0644, 1352 .proc_handler = proc_dointvec_minmax, 1353 .extra1 = &zero, 1354 .extra2 = &one_hundred, 1355 }, 1356 #ifdef CONFIG_HUGETLB_PAGE 1357 { 1358 .procname = "nr_hugepages", 1359 .data = NULL, 1360 .maxlen = sizeof(unsigned long), 1361 .mode = 0644, 1362 .proc_handler = hugetlb_sysctl_handler, 1363 }, 1364 #ifdef CONFIG_NUMA 1365 { 1366 .procname = "nr_hugepages_mempolicy", 1367 .data = NULL, 1368 .maxlen = sizeof(unsigned long), 1369 .mode = 0644, 1370 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1371 }, 1372 #endif 1373 { 1374 .procname = "hugetlb_shm_group", 1375 .data = &sysctl_hugetlb_shm_group, 1376 .maxlen = sizeof(gid_t), 1377 .mode = 0644, 1378 .proc_handler = proc_dointvec, 1379 }, 1380 { 1381 .procname = "hugepages_treat_as_movable", 1382 .data = &hugepages_treat_as_movable, 1383 .maxlen = sizeof(int), 1384 .mode = 0644, 1385 .proc_handler = proc_dointvec, 1386 }, 1387 { 1388 .procname = "nr_overcommit_hugepages", 1389 .data = NULL, 1390 .maxlen = sizeof(unsigned long), 1391 .mode = 0644, 1392 .proc_handler = hugetlb_overcommit_handler, 1393 }, 1394 #endif 1395 { 1396 .procname = "lowmem_reserve_ratio", 1397 .data = &sysctl_lowmem_reserve_ratio, 1398 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1399 .mode = 0644, 1400 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1401 }, 1402 { 1403 .procname = "drop_caches", 1404 .data = &sysctl_drop_caches, 1405 .maxlen = sizeof(int), 1406 .mode = 0644, 1407 .proc_handler = drop_caches_sysctl_handler, 1408 .extra1 = &one, 1409 .extra2 = &four, 1410 }, 1411 #ifdef CONFIG_COMPACTION 1412 { 1413 .procname = "compact_memory", 1414 .data = &sysctl_compact_memory, 1415 .maxlen = sizeof(int), 1416 .mode = 0200, 1417 .proc_handler = sysctl_compaction_handler, 1418 }, 1419 { 1420 .procname = "extfrag_threshold", 1421 .data = &sysctl_extfrag_threshold, 1422 .maxlen = sizeof(int), 1423 .mode = 0644, 1424 .proc_handler = sysctl_extfrag_handler, 1425 .extra1 = &min_extfrag_threshold, 1426 .extra2 = &max_extfrag_threshold, 1427 }, 1428 { 1429 .procname = "compact_unevictable_allowed", 1430 .data = &sysctl_compact_unevictable_allowed, 1431 .maxlen = sizeof(int), 1432 .mode = 0644, 1433 .proc_handler = proc_dointvec, 1434 .extra1 = &zero, 1435 .extra2 = &one, 1436 }, 1437 1438 #endif /* CONFIG_COMPACTION */ 1439 { 1440 .procname = "min_free_kbytes", 1441 .data = &min_free_kbytes, 1442 .maxlen = sizeof(min_free_kbytes), 1443 .mode = 0644, 1444 .proc_handler = min_free_kbytes_sysctl_handler, 1445 .extra1 = &zero, 1446 }, 1447 { 1448 .procname = "watermark_scale_factor", 1449 .data = &watermark_scale_factor, 1450 .maxlen = sizeof(watermark_scale_factor), 1451 .mode = 0644, 1452 .proc_handler = watermark_scale_factor_sysctl_handler, 1453 .extra1 = &one, 1454 .extra2 = &one_thousand, 1455 }, 1456 { 1457 .procname = "percpu_pagelist_fraction", 1458 .data = &percpu_pagelist_fraction, 1459 .maxlen = sizeof(percpu_pagelist_fraction), 1460 .mode = 0644, 1461 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1462 .extra1 = &zero, 1463 }, 1464 #ifdef CONFIG_MMU 1465 { 1466 .procname = "max_map_count", 1467 .data = &sysctl_max_map_count, 1468 .maxlen = sizeof(sysctl_max_map_count), 1469 .mode = 0644, 1470 .proc_handler = proc_dointvec_minmax, 1471 .extra1 = &zero, 1472 }, 1473 #else 1474 { 1475 .procname = "nr_trim_pages", 1476 .data = &sysctl_nr_trim_pages, 1477 .maxlen = sizeof(sysctl_nr_trim_pages), 1478 .mode = 0644, 1479 .proc_handler = proc_dointvec_minmax, 1480 .extra1 = &zero, 1481 }, 1482 #endif 1483 { 1484 .procname = "laptop_mode", 1485 .data = &laptop_mode, 1486 .maxlen = sizeof(laptop_mode), 1487 .mode = 0644, 1488 .proc_handler = proc_dointvec_jiffies, 1489 }, 1490 { 1491 .procname = "block_dump", 1492 .data = &block_dump, 1493 .maxlen = sizeof(block_dump), 1494 .mode = 0644, 1495 .proc_handler = proc_dointvec, 1496 .extra1 = &zero, 1497 }, 1498 { 1499 .procname = "vfs_cache_pressure", 1500 .data = &sysctl_vfs_cache_pressure, 1501 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1502 .mode = 0644, 1503 .proc_handler = proc_dointvec, 1504 .extra1 = &zero, 1505 }, 1506 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1507 { 1508 .procname = "legacy_va_layout", 1509 .data = &sysctl_legacy_va_layout, 1510 .maxlen = sizeof(sysctl_legacy_va_layout), 1511 .mode = 0644, 1512 .proc_handler = proc_dointvec, 1513 .extra1 = &zero, 1514 }, 1515 #endif 1516 #ifdef CONFIG_NUMA 1517 { 1518 .procname = "zone_reclaim_mode", 1519 .data = &node_reclaim_mode, 1520 .maxlen = sizeof(node_reclaim_mode), 1521 .mode = 0644, 1522 .proc_handler = proc_dointvec, 1523 .extra1 = &zero, 1524 }, 1525 { 1526 .procname = "min_unmapped_ratio", 1527 .data = &sysctl_min_unmapped_ratio, 1528 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1529 .mode = 0644, 1530 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1531 .extra1 = &zero, 1532 .extra2 = &one_hundred, 1533 }, 1534 { 1535 .procname = "min_slab_ratio", 1536 .data = &sysctl_min_slab_ratio, 1537 .maxlen = sizeof(sysctl_min_slab_ratio), 1538 .mode = 0644, 1539 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1540 .extra1 = &zero, 1541 .extra2 = &one_hundred, 1542 }, 1543 #endif 1544 #ifdef CONFIG_SMP 1545 { 1546 .procname = "stat_interval", 1547 .data = &sysctl_stat_interval, 1548 .maxlen = sizeof(sysctl_stat_interval), 1549 .mode = 0644, 1550 .proc_handler = proc_dointvec_jiffies, 1551 }, 1552 { 1553 .procname = "stat_refresh", 1554 .data = NULL, 1555 .maxlen = 0, 1556 .mode = 0600, 1557 .proc_handler = vmstat_refresh, 1558 }, 1559 #endif 1560 #ifdef CONFIG_MMU 1561 { 1562 .procname = "mmap_min_addr", 1563 .data = &dac_mmap_min_addr, 1564 .maxlen = sizeof(unsigned long), 1565 .mode = 0644, 1566 .proc_handler = mmap_min_addr_handler, 1567 }, 1568 #endif 1569 #ifdef CONFIG_NUMA 1570 { 1571 .procname = "numa_zonelist_order", 1572 .data = &numa_zonelist_order, 1573 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1574 .mode = 0644, 1575 .proc_handler = numa_zonelist_order_handler, 1576 }, 1577 #endif 1578 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1579 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1580 { 1581 .procname = "vdso_enabled", 1582 #ifdef CONFIG_X86_32 1583 .data = &vdso32_enabled, 1584 .maxlen = sizeof(vdso32_enabled), 1585 #else 1586 .data = &vdso_enabled, 1587 .maxlen = sizeof(vdso_enabled), 1588 #endif 1589 .mode = 0644, 1590 .proc_handler = proc_dointvec, 1591 .extra1 = &zero, 1592 }, 1593 #endif 1594 #ifdef CONFIG_HIGHMEM 1595 { 1596 .procname = "highmem_is_dirtyable", 1597 .data = &vm_highmem_is_dirtyable, 1598 .maxlen = sizeof(vm_highmem_is_dirtyable), 1599 .mode = 0644, 1600 .proc_handler = proc_dointvec_minmax, 1601 .extra1 = &zero, 1602 .extra2 = &one, 1603 }, 1604 #endif 1605 #ifdef CONFIG_MEMORY_FAILURE 1606 { 1607 .procname = "memory_failure_early_kill", 1608 .data = &sysctl_memory_failure_early_kill, 1609 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1610 .mode = 0644, 1611 .proc_handler = proc_dointvec_minmax, 1612 .extra1 = &zero, 1613 .extra2 = &one, 1614 }, 1615 { 1616 .procname = "memory_failure_recovery", 1617 .data = &sysctl_memory_failure_recovery, 1618 .maxlen = sizeof(sysctl_memory_failure_recovery), 1619 .mode = 0644, 1620 .proc_handler = proc_dointvec_minmax, 1621 .extra1 = &zero, 1622 .extra2 = &one, 1623 }, 1624 #endif 1625 { 1626 .procname = "user_reserve_kbytes", 1627 .data = &sysctl_user_reserve_kbytes, 1628 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1629 .mode = 0644, 1630 .proc_handler = proc_doulongvec_minmax, 1631 }, 1632 { 1633 .procname = "admin_reserve_kbytes", 1634 .data = &sysctl_admin_reserve_kbytes, 1635 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1636 .mode = 0644, 1637 .proc_handler = proc_doulongvec_minmax, 1638 }, 1639 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1640 { 1641 .procname = "mmap_rnd_bits", 1642 .data = &mmap_rnd_bits, 1643 .maxlen = sizeof(mmap_rnd_bits), 1644 .mode = 0600, 1645 .proc_handler = proc_dointvec_minmax, 1646 .extra1 = (void *)&mmap_rnd_bits_min, 1647 .extra2 = (void *)&mmap_rnd_bits_max, 1648 }, 1649 #endif 1650 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1651 { 1652 .procname = "mmap_rnd_compat_bits", 1653 .data = &mmap_rnd_compat_bits, 1654 .maxlen = sizeof(mmap_rnd_compat_bits), 1655 .mode = 0600, 1656 .proc_handler = proc_dointvec_minmax, 1657 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1658 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1659 }, 1660 #endif 1661 { } 1662 }; 1663 1664 static struct ctl_table fs_table[] = { 1665 { 1666 .procname = "inode-nr", 1667 .data = &inodes_stat, 1668 .maxlen = 2*sizeof(long), 1669 .mode = 0444, 1670 .proc_handler = proc_nr_inodes, 1671 }, 1672 { 1673 .procname = "inode-state", 1674 .data = &inodes_stat, 1675 .maxlen = 7*sizeof(long), 1676 .mode = 0444, 1677 .proc_handler = proc_nr_inodes, 1678 }, 1679 { 1680 .procname = "file-nr", 1681 .data = &files_stat, 1682 .maxlen = sizeof(files_stat), 1683 .mode = 0444, 1684 .proc_handler = proc_nr_files, 1685 }, 1686 { 1687 .procname = "file-max", 1688 .data = &files_stat.max_files, 1689 .maxlen = sizeof(files_stat.max_files), 1690 .mode = 0644, 1691 .proc_handler = proc_doulongvec_minmax, 1692 }, 1693 { 1694 .procname = "nr_open", 1695 .data = &sysctl_nr_open, 1696 .maxlen = sizeof(unsigned int), 1697 .mode = 0644, 1698 .proc_handler = proc_dointvec_minmax, 1699 .extra1 = &sysctl_nr_open_min, 1700 .extra2 = &sysctl_nr_open_max, 1701 }, 1702 { 1703 .procname = "dentry-state", 1704 .data = &dentry_stat, 1705 .maxlen = 6*sizeof(long), 1706 .mode = 0444, 1707 .proc_handler = proc_nr_dentry, 1708 }, 1709 { 1710 .procname = "overflowuid", 1711 .data = &fs_overflowuid, 1712 .maxlen = sizeof(int), 1713 .mode = 0644, 1714 .proc_handler = proc_dointvec_minmax, 1715 .extra1 = &minolduid, 1716 .extra2 = &maxolduid, 1717 }, 1718 { 1719 .procname = "overflowgid", 1720 .data = &fs_overflowgid, 1721 .maxlen = sizeof(int), 1722 .mode = 0644, 1723 .proc_handler = proc_dointvec_minmax, 1724 .extra1 = &minolduid, 1725 .extra2 = &maxolduid, 1726 }, 1727 #ifdef CONFIG_FILE_LOCKING 1728 { 1729 .procname = "leases-enable", 1730 .data = &leases_enable, 1731 .maxlen = sizeof(int), 1732 .mode = 0644, 1733 .proc_handler = proc_dointvec, 1734 }, 1735 #endif 1736 #ifdef CONFIG_DNOTIFY 1737 { 1738 .procname = "dir-notify-enable", 1739 .data = &dir_notify_enable, 1740 .maxlen = sizeof(int), 1741 .mode = 0644, 1742 .proc_handler = proc_dointvec, 1743 }, 1744 #endif 1745 #ifdef CONFIG_MMU 1746 #ifdef CONFIG_FILE_LOCKING 1747 { 1748 .procname = "lease-break-time", 1749 .data = &lease_break_time, 1750 .maxlen = sizeof(int), 1751 .mode = 0644, 1752 .proc_handler = proc_dointvec, 1753 }, 1754 #endif 1755 #ifdef CONFIG_AIO 1756 { 1757 .procname = "aio-nr", 1758 .data = &aio_nr, 1759 .maxlen = sizeof(aio_nr), 1760 .mode = 0444, 1761 .proc_handler = proc_doulongvec_minmax, 1762 }, 1763 { 1764 .procname = "aio-max-nr", 1765 .data = &aio_max_nr, 1766 .maxlen = sizeof(aio_max_nr), 1767 .mode = 0644, 1768 .proc_handler = proc_doulongvec_minmax, 1769 }, 1770 #endif /* CONFIG_AIO */ 1771 #ifdef CONFIG_INOTIFY_USER 1772 { 1773 .procname = "inotify", 1774 .mode = 0555, 1775 .child = inotify_table, 1776 }, 1777 #endif 1778 #ifdef CONFIG_EPOLL 1779 { 1780 .procname = "epoll", 1781 .mode = 0555, 1782 .child = epoll_table, 1783 }, 1784 #endif 1785 #endif 1786 { 1787 .procname = "protected_symlinks", 1788 .data = &sysctl_protected_symlinks, 1789 .maxlen = sizeof(int), 1790 .mode = 0600, 1791 .proc_handler = proc_dointvec_minmax, 1792 .extra1 = &zero, 1793 .extra2 = &one, 1794 }, 1795 { 1796 .procname = "protected_hardlinks", 1797 .data = &sysctl_protected_hardlinks, 1798 .maxlen = sizeof(int), 1799 .mode = 0600, 1800 .proc_handler = proc_dointvec_minmax, 1801 .extra1 = &zero, 1802 .extra2 = &one, 1803 }, 1804 { 1805 .procname = "suid_dumpable", 1806 .data = &suid_dumpable, 1807 .maxlen = sizeof(int), 1808 .mode = 0644, 1809 .proc_handler = proc_dointvec_minmax_coredump, 1810 .extra1 = &zero, 1811 .extra2 = &two, 1812 }, 1813 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1814 { 1815 .procname = "binfmt_misc", 1816 .mode = 0555, 1817 .child = sysctl_mount_point, 1818 }, 1819 #endif 1820 { 1821 .procname = "pipe-max-size", 1822 .data = &pipe_max_size, 1823 .maxlen = sizeof(int), 1824 .mode = 0644, 1825 .proc_handler = &pipe_proc_fn, 1826 .extra1 = &pipe_min_size, 1827 }, 1828 { 1829 .procname = "pipe-user-pages-hard", 1830 .data = &pipe_user_pages_hard, 1831 .maxlen = sizeof(pipe_user_pages_hard), 1832 .mode = 0644, 1833 .proc_handler = proc_doulongvec_minmax, 1834 }, 1835 { 1836 .procname = "pipe-user-pages-soft", 1837 .data = &pipe_user_pages_soft, 1838 .maxlen = sizeof(pipe_user_pages_soft), 1839 .mode = 0644, 1840 .proc_handler = proc_doulongvec_minmax, 1841 }, 1842 { 1843 .procname = "mount-max", 1844 .data = &sysctl_mount_max, 1845 .maxlen = sizeof(unsigned int), 1846 .mode = 0644, 1847 .proc_handler = proc_dointvec_minmax, 1848 .extra1 = &one, 1849 }, 1850 { } 1851 }; 1852 1853 static struct ctl_table debug_table[] = { 1854 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1855 { 1856 .procname = "exception-trace", 1857 .data = &show_unhandled_signals, 1858 .maxlen = sizeof(int), 1859 .mode = 0644, 1860 .proc_handler = proc_dointvec 1861 }, 1862 #endif 1863 #if defined(CONFIG_OPTPROBES) 1864 { 1865 .procname = "kprobes-optimization", 1866 .data = &sysctl_kprobes_optimization, 1867 .maxlen = sizeof(int), 1868 .mode = 0644, 1869 .proc_handler = proc_kprobes_optimization_handler, 1870 .extra1 = &zero, 1871 .extra2 = &one, 1872 }, 1873 #endif 1874 { } 1875 }; 1876 1877 static struct ctl_table dev_table[] = { 1878 { } 1879 }; 1880 1881 int __init sysctl_init(void) 1882 { 1883 struct ctl_table_header *hdr; 1884 1885 hdr = register_sysctl_table(sysctl_base_table); 1886 kmemleak_not_leak(hdr); 1887 return 0; 1888 } 1889 1890 #endif /* CONFIG_SYSCTL */ 1891 1892 /* 1893 * /proc/sys support 1894 */ 1895 1896 #ifdef CONFIG_PROC_SYSCTL 1897 1898 static int _proc_do_string(char *data, int maxlen, int write, 1899 char __user *buffer, 1900 size_t *lenp, loff_t *ppos) 1901 { 1902 size_t len; 1903 char __user *p; 1904 char c; 1905 1906 if (!data || !maxlen || !*lenp) { 1907 *lenp = 0; 1908 return 0; 1909 } 1910 1911 if (write) { 1912 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1913 /* Only continue writes not past the end of buffer. */ 1914 len = strlen(data); 1915 if (len > maxlen - 1) 1916 len = maxlen - 1; 1917 1918 if (*ppos > len) 1919 return 0; 1920 len = *ppos; 1921 } else { 1922 /* Start writing from beginning of buffer. */ 1923 len = 0; 1924 } 1925 1926 *ppos += *lenp; 1927 p = buffer; 1928 while ((p - buffer) < *lenp && len < maxlen - 1) { 1929 if (get_user(c, p++)) 1930 return -EFAULT; 1931 if (c == 0 || c == '\n') 1932 break; 1933 data[len++] = c; 1934 } 1935 data[len] = 0; 1936 } else { 1937 len = strlen(data); 1938 if (len > maxlen) 1939 len = maxlen; 1940 1941 if (*ppos > len) { 1942 *lenp = 0; 1943 return 0; 1944 } 1945 1946 data += *ppos; 1947 len -= *ppos; 1948 1949 if (len > *lenp) 1950 len = *lenp; 1951 if (len) 1952 if (copy_to_user(buffer, data, len)) 1953 return -EFAULT; 1954 if (len < *lenp) { 1955 if (put_user('\n', buffer + len)) 1956 return -EFAULT; 1957 len++; 1958 } 1959 *lenp = len; 1960 *ppos += len; 1961 } 1962 return 0; 1963 } 1964 1965 static void warn_sysctl_write(struct ctl_table *table) 1966 { 1967 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1968 "This will not be supported in the future. To silence this\n" 1969 "warning, set kernel.sysctl_writes_strict = -1\n", 1970 current->comm, table->procname); 1971 } 1972 1973 /** 1974 * proc_first_pos_non_zero_ignore - check if firs position is allowed 1975 * @ppos: file position 1976 * @table: the sysctl table 1977 * 1978 * Returns true if the first position is non-zero and the sysctl_writes_strict 1979 * mode indicates this is not allowed for numeric input types. String proc 1980 * hadlers can ignore the return value. 1981 */ 1982 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 1983 struct ctl_table *table) 1984 { 1985 if (!*ppos) 1986 return false; 1987 1988 switch (sysctl_writes_strict) { 1989 case SYSCTL_WRITES_STRICT: 1990 return true; 1991 case SYSCTL_WRITES_WARN: 1992 warn_sysctl_write(table); 1993 return false; 1994 default: 1995 return false; 1996 } 1997 } 1998 1999 /** 2000 * proc_dostring - read a string sysctl 2001 * @table: the sysctl table 2002 * @write: %TRUE if this is a write to the sysctl file 2003 * @buffer: the user buffer 2004 * @lenp: the size of the user buffer 2005 * @ppos: file position 2006 * 2007 * Reads/writes a string from/to the user buffer. If the kernel 2008 * buffer provided is not large enough to hold the string, the 2009 * string is truncated. The copied string is %NULL-terminated. 2010 * If the string is being read by the user process, it is copied 2011 * and a newline '\n' is added. It is truncated if the buffer is 2012 * not large enough. 2013 * 2014 * Returns 0 on success. 2015 */ 2016 int proc_dostring(struct ctl_table *table, int write, 2017 void __user *buffer, size_t *lenp, loff_t *ppos) 2018 { 2019 if (write) 2020 proc_first_pos_non_zero_ignore(ppos, table); 2021 2022 return _proc_do_string((char *)(table->data), table->maxlen, write, 2023 (char __user *)buffer, lenp, ppos); 2024 } 2025 2026 static size_t proc_skip_spaces(char **buf) 2027 { 2028 size_t ret; 2029 char *tmp = skip_spaces(*buf); 2030 ret = tmp - *buf; 2031 *buf = tmp; 2032 return ret; 2033 } 2034 2035 static void proc_skip_char(char **buf, size_t *size, const char v) 2036 { 2037 while (*size) { 2038 if (**buf != v) 2039 break; 2040 (*size)--; 2041 (*buf)++; 2042 } 2043 } 2044 2045 #define TMPBUFLEN 22 2046 /** 2047 * proc_get_long - reads an ASCII formatted integer from a user buffer 2048 * 2049 * @buf: a kernel buffer 2050 * @size: size of the kernel buffer 2051 * @val: this is where the number will be stored 2052 * @neg: set to %TRUE if number is negative 2053 * @perm_tr: a vector which contains the allowed trailers 2054 * @perm_tr_len: size of the perm_tr vector 2055 * @tr: pointer to store the trailer character 2056 * 2057 * In case of success %0 is returned and @buf and @size are updated with 2058 * the amount of bytes read. If @tr is non-NULL and a trailing 2059 * character exists (size is non-zero after returning from this 2060 * function), @tr is updated with the trailing character. 2061 */ 2062 static int proc_get_long(char **buf, size_t *size, 2063 unsigned long *val, bool *neg, 2064 const char *perm_tr, unsigned perm_tr_len, char *tr) 2065 { 2066 int len; 2067 char *p, tmp[TMPBUFLEN]; 2068 2069 if (!*size) 2070 return -EINVAL; 2071 2072 len = *size; 2073 if (len > TMPBUFLEN - 1) 2074 len = TMPBUFLEN - 1; 2075 2076 memcpy(tmp, *buf, len); 2077 2078 tmp[len] = 0; 2079 p = tmp; 2080 if (*p == '-' && *size > 1) { 2081 *neg = true; 2082 p++; 2083 } else 2084 *neg = false; 2085 if (!isdigit(*p)) 2086 return -EINVAL; 2087 2088 *val = simple_strtoul(p, &p, 0); 2089 2090 len = p - tmp; 2091 2092 /* We don't know if the next char is whitespace thus we may accept 2093 * invalid integers (e.g. 1234...a) or two integers instead of one 2094 * (e.g. 123...1). So lets not allow such large numbers. */ 2095 if (len == TMPBUFLEN - 1) 2096 return -EINVAL; 2097 2098 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2099 return -EINVAL; 2100 2101 if (tr && (len < *size)) 2102 *tr = *p; 2103 2104 *buf += len; 2105 *size -= len; 2106 2107 return 0; 2108 } 2109 2110 /** 2111 * proc_put_long - converts an integer to a decimal ASCII formatted string 2112 * 2113 * @buf: the user buffer 2114 * @size: the size of the user buffer 2115 * @val: the integer to be converted 2116 * @neg: sign of the number, %TRUE for negative 2117 * 2118 * In case of success %0 is returned and @buf and @size are updated with 2119 * the amount of bytes written. 2120 */ 2121 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2122 bool neg) 2123 { 2124 int len; 2125 char tmp[TMPBUFLEN], *p = tmp; 2126 2127 sprintf(p, "%s%lu", neg ? "-" : "", val); 2128 len = strlen(tmp); 2129 if (len > *size) 2130 len = *size; 2131 if (copy_to_user(*buf, tmp, len)) 2132 return -EFAULT; 2133 *size -= len; 2134 *buf += len; 2135 return 0; 2136 } 2137 #undef TMPBUFLEN 2138 2139 static int proc_put_char(void __user **buf, size_t *size, char c) 2140 { 2141 if (*size) { 2142 char __user **buffer = (char __user **)buf; 2143 if (put_user(c, *buffer)) 2144 return -EFAULT; 2145 (*size)--, (*buffer)++; 2146 *buf = *buffer; 2147 } 2148 return 0; 2149 } 2150 2151 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2152 int *valp, 2153 int write, void *data) 2154 { 2155 if (write) { 2156 if (*negp) { 2157 if (*lvalp > (unsigned long) INT_MAX + 1) 2158 return -EINVAL; 2159 *valp = -*lvalp; 2160 } else { 2161 if (*lvalp > (unsigned long) INT_MAX) 2162 return -EINVAL; 2163 *valp = *lvalp; 2164 } 2165 } else { 2166 int val = *valp; 2167 if (val < 0) { 2168 *negp = true; 2169 *lvalp = -(unsigned long)val; 2170 } else { 2171 *negp = false; 2172 *lvalp = (unsigned long)val; 2173 } 2174 } 2175 return 0; 2176 } 2177 2178 static int do_proc_douintvec_conv(unsigned long *lvalp, 2179 unsigned int *valp, 2180 int write, void *data) 2181 { 2182 if (write) { 2183 if (*lvalp > UINT_MAX) 2184 return -EINVAL; 2185 if (*lvalp > UINT_MAX) 2186 return -EINVAL; 2187 *valp = *lvalp; 2188 } else { 2189 unsigned int val = *valp; 2190 *lvalp = (unsigned long)val; 2191 } 2192 return 0; 2193 } 2194 2195 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2196 2197 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2198 int write, void __user *buffer, 2199 size_t *lenp, loff_t *ppos, 2200 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2201 int write, void *data), 2202 void *data) 2203 { 2204 int *i, vleft, first = 1, err = 0; 2205 size_t left; 2206 char *kbuf = NULL, *p; 2207 2208 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2209 *lenp = 0; 2210 return 0; 2211 } 2212 2213 i = (int *) tbl_data; 2214 vleft = table->maxlen / sizeof(*i); 2215 left = *lenp; 2216 2217 if (!conv) 2218 conv = do_proc_dointvec_conv; 2219 2220 if (write) { 2221 if (proc_first_pos_non_zero_ignore(ppos, table)) 2222 goto out; 2223 2224 if (left > PAGE_SIZE - 1) 2225 left = PAGE_SIZE - 1; 2226 p = kbuf = memdup_user_nul(buffer, left); 2227 if (IS_ERR(kbuf)) 2228 return PTR_ERR(kbuf); 2229 } 2230 2231 for (; left && vleft--; i++, first=0) { 2232 unsigned long lval; 2233 bool neg; 2234 2235 if (write) { 2236 left -= proc_skip_spaces(&p); 2237 2238 if (!left) 2239 break; 2240 err = proc_get_long(&p, &left, &lval, &neg, 2241 proc_wspace_sep, 2242 sizeof(proc_wspace_sep), NULL); 2243 if (err) 2244 break; 2245 if (conv(&neg, &lval, i, 1, data)) { 2246 err = -EINVAL; 2247 break; 2248 } 2249 } else { 2250 if (conv(&neg, &lval, i, 0, data)) { 2251 err = -EINVAL; 2252 break; 2253 } 2254 if (!first) 2255 err = proc_put_char(&buffer, &left, '\t'); 2256 if (err) 2257 break; 2258 err = proc_put_long(&buffer, &left, lval, neg); 2259 if (err) 2260 break; 2261 } 2262 } 2263 2264 if (!write && !first && left && !err) 2265 err = proc_put_char(&buffer, &left, '\n'); 2266 if (write && !err && left) 2267 left -= proc_skip_spaces(&p); 2268 if (write) { 2269 kfree(kbuf); 2270 if (first) 2271 return err ? : -EINVAL; 2272 } 2273 *lenp -= left; 2274 out: 2275 *ppos += *lenp; 2276 return err; 2277 } 2278 2279 static int do_proc_dointvec(struct ctl_table *table, int write, 2280 void __user *buffer, size_t *lenp, loff_t *ppos, 2281 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2282 int write, void *data), 2283 void *data) 2284 { 2285 return __do_proc_dointvec(table->data, table, write, 2286 buffer, lenp, ppos, conv, data); 2287 } 2288 2289 static int do_proc_douintvec_w(unsigned int *tbl_data, 2290 struct ctl_table *table, 2291 void __user *buffer, 2292 size_t *lenp, loff_t *ppos, 2293 int (*conv)(unsigned long *lvalp, 2294 unsigned int *valp, 2295 int write, void *data), 2296 void *data) 2297 { 2298 unsigned long lval; 2299 int err = 0; 2300 size_t left; 2301 bool neg; 2302 char *kbuf = NULL, *p; 2303 2304 left = *lenp; 2305 2306 if (proc_first_pos_non_zero_ignore(ppos, table)) 2307 goto bail_early; 2308 2309 if (left > PAGE_SIZE - 1) 2310 left = PAGE_SIZE - 1; 2311 2312 p = kbuf = memdup_user_nul(buffer, left); 2313 if (IS_ERR(kbuf)) 2314 return -EINVAL; 2315 2316 left -= proc_skip_spaces(&p); 2317 if (!left) { 2318 err = -EINVAL; 2319 goto out_free; 2320 } 2321 2322 err = proc_get_long(&p, &left, &lval, &neg, 2323 proc_wspace_sep, 2324 sizeof(proc_wspace_sep), NULL); 2325 if (err || neg) { 2326 err = -EINVAL; 2327 goto out_free; 2328 } 2329 2330 if (conv(&lval, tbl_data, 1, data)) { 2331 err = -EINVAL; 2332 goto out_free; 2333 } 2334 2335 if (!err && left) 2336 left -= proc_skip_spaces(&p); 2337 2338 out_free: 2339 kfree(kbuf); 2340 if (err) 2341 return -EINVAL; 2342 2343 return 0; 2344 2345 /* This is in keeping with old __do_proc_dointvec() */ 2346 bail_early: 2347 *ppos += *lenp; 2348 return err; 2349 } 2350 2351 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2352 size_t *lenp, loff_t *ppos, 2353 int (*conv)(unsigned long *lvalp, 2354 unsigned int *valp, 2355 int write, void *data), 2356 void *data) 2357 { 2358 unsigned long lval; 2359 int err = 0; 2360 size_t left; 2361 2362 left = *lenp; 2363 2364 if (conv(&lval, tbl_data, 0, data)) { 2365 err = -EINVAL; 2366 goto out; 2367 } 2368 2369 err = proc_put_long(&buffer, &left, lval, false); 2370 if (err || !left) 2371 goto out; 2372 2373 err = proc_put_char(&buffer, &left, '\n'); 2374 2375 out: 2376 *lenp -= left; 2377 *ppos += *lenp; 2378 2379 return err; 2380 } 2381 2382 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2383 int write, void __user *buffer, 2384 size_t *lenp, loff_t *ppos, 2385 int (*conv)(unsigned long *lvalp, 2386 unsigned int *valp, 2387 int write, void *data), 2388 void *data) 2389 { 2390 unsigned int *i, vleft; 2391 2392 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2393 *lenp = 0; 2394 return 0; 2395 } 2396 2397 i = (unsigned int *) tbl_data; 2398 vleft = table->maxlen / sizeof(*i); 2399 2400 /* 2401 * Arrays are not supported, keep this simple. *Do not* add 2402 * support for them. 2403 */ 2404 if (vleft != 1) { 2405 *lenp = 0; 2406 return -EINVAL; 2407 } 2408 2409 if (!conv) 2410 conv = do_proc_douintvec_conv; 2411 2412 if (write) 2413 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2414 conv, data); 2415 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2416 } 2417 2418 static int do_proc_douintvec(struct ctl_table *table, int write, 2419 void __user *buffer, size_t *lenp, loff_t *ppos, 2420 int (*conv)(unsigned long *lvalp, 2421 unsigned int *valp, 2422 int write, void *data), 2423 void *data) 2424 { 2425 return __do_proc_douintvec(table->data, table, write, 2426 buffer, lenp, ppos, conv, data); 2427 } 2428 2429 /** 2430 * proc_dointvec - read a vector of integers 2431 * @table: the sysctl table 2432 * @write: %TRUE if this is a write to the sysctl file 2433 * @buffer: the user buffer 2434 * @lenp: the size of the user buffer 2435 * @ppos: file position 2436 * 2437 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2438 * values from/to the user buffer, treated as an ASCII string. 2439 * 2440 * Returns 0 on success. 2441 */ 2442 int proc_dointvec(struct ctl_table *table, int write, 2443 void __user *buffer, size_t *lenp, loff_t *ppos) 2444 { 2445 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2446 } 2447 2448 /** 2449 * proc_douintvec - read a vector of unsigned integers 2450 * @table: the sysctl table 2451 * @write: %TRUE if this is a write to the sysctl file 2452 * @buffer: the user buffer 2453 * @lenp: the size of the user buffer 2454 * @ppos: file position 2455 * 2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2457 * values from/to the user buffer, treated as an ASCII string. 2458 * 2459 * Returns 0 on success. 2460 */ 2461 int proc_douintvec(struct ctl_table *table, int write, 2462 void __user *buffer, size_t *lenp, loff_t *ppos) 2463 { 2464 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2465 do_proc_douintvec_conv, NULL); 2466 } 2467 2468 /* 2469 * Taint values can only be increased 2470 * This means we can safely use a temporary. 2471 */ 2472 static int proc_taint(struct ctl_table *table, int write, 2473 void __user *buffer, size_t *lenp, loff_t *ppos) 2474 { 2475 struct ctl_table t; 2476 unsigned long tmptaint = get_taint(); 2477 int err; 2478 2479 if (write && !capable(CAP_SYS_ADMIN)) 2480 return -EPERM; 2481 2482 t = *table; 2483 t.data = &tmptaint; 2484 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2485 if (err < 0) 2486 return err; 2487 2488 if (write) { 2489 /* 2490 * Poor man's atomic or. Not worth adding a primitive 2491 * to everyone's atomic.h for this 2492 */ 2493 int i; 2494 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2495 if ((tmptaint >> i) & 1) 2496 add_taint(i, LOCKDEP_STILL_OK); 2497 } 2498 } 2499 2500 return err; 2501 } 2502 2503 #ifdef CONFIG_PRINTK 2504 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2505 void __user *buffer, size_t *lenp, loff_t *ppos) 2506 { 2507 if (write && !capable(CAP_SYS_ADMIN)) 2508 return -EPERM; 2509 2510 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2511 } 2512 #endif 2513 2514 struct do_proc_dointvec_minmax_conv_param { 2515 int *min; 2516 int *max; 2517 }; 2518 2519 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2520 int *valp, 2521 int write, void *data) 2522 { 2523 struct do_proc_dointvec_minmax_conv_param *param = data; 2524 if (write) { 2525 int val = *negp ? -*lvalp : *lvalp; 2526 if ((param->min && *param->min > val) || 2527 (param->max && *param->max < val)) 2528 return -EINVAL; 2529 *valp = val; 2530 } else { 2531 int val = *valp; 2532 if (val < 0) { 2533 *negp = true; 2534 *lvalp = -(unsigned long)val; 2535 } else { 2536 *negp = false; 2537 *lvalp = (unsigned long)val; 2538 } 2539 } 2540 return 0; 2541 } 2542 2543 /** 2544 * proc_dointvec_minmax - read a vector of integers with min/max values 2545 * @table: the sysctl table 2546 * @write: %TRUE if this is a write to the sysctl file 2547 * @buffer: the user buffer 2548 * @lenp: the size of the user buffer 2549 * @ppos: file position 2550 * 2551 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2552 * values from/to the user buffer, treated as an ASCII string. 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_dointvec_minmax(struct ctl_table *table, int write, 2560 void __user *buffer, size_t *lenp, loff_t *ppos) 2561 { 2562 struct do_proc_dointvec_minmax_conv_param param = { 2563 .min = (int *) table->extra1, 2564 .max = (int *) table->extra2, 2565 }; 2566 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2567 do_proc_dointvec_minmax_conv, ¶m); 2568 } 2569 2570 struct do_proc_douintvec_minmax_conv_param { 2571 unsigned int *min; 2572 unsigned int *max; 2573 }; 2574 2575 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2576 unsigned int *valp, 2577 int write, void *data) 2578 { 2579 struct do_proc_douintvec_minmax_conv_param *param = data; 2580 2581 if (write) { 2582 unsigned int val = *lvalp; 2583 2584 if ((param->min && *param->min > val) || 2585 (param->max && *param->max < val)) 2586 return -ERANGE; 2587 2588 if (*lvalp > UINT_MAX) 2589 return -EINVAL; 2590 *valp = val; 2591 } else { 2592 unsigned int val = *valp; 2593 *lvalp = (unsigned long) val; 2594 } 2595 2596 return 0; 2597 } 2598 2599 /** 2600 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2601 * @table: the sysctl table 2602 * @write: %TRUE if this is a write to the sysctl file 2603 * @buffer: the user buffer 2604 * @lenp: the size of the user buffer 2605 * @ppos: file position 2606 * 2607 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2608 * values from/to the user buffer, treated as an ASCII string. Negative 2609 * strings are not allowed. 2610 * 2611 * This routine will ensure the values are within the range specified by 2612 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2613 * check for UINT_MAX to avoid having to support wrap around uses from 2614 * userspace. 2615 * 2616 * Returns 0 on success. 2617 */ 2618 int proc_douintvec_minmax(struct ctl_table *table, int write, 2619 void __user *buffer, size_t *lenp, loff_t *ppos) 2620 { 2621 struct do_proc_douintvec_minmax_conv_param param = { 2622 .min = (unsigned int *) table->extra1, 2623 .max = (unsigned int *) table->extra2, 2624 }; 2625 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2626 do_proc_douintvec_minmax_conv, ¶m); 2627 } 2628 2629 static void validate_coredump_safety(void) 2630 { 2631 #ifdef CONFIG_COREDUMP 2632 if (suid_dumpable == SUID_DUMP_ROOT && 2633 core_pattern[0] != '/' && core_pattern[0] != '|') { 2634 printk(KERN_WARNING 2635 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2636 "Pipe handler or fully qualified core dump path required.\n" 2637 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2638 ); 2639 } 2640 #endif 2641 } 2642 2643 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2644 void __user *buffer, size_t *lenp, loff_t *ppos) 2645 { 2646 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2647 if (!error) 2648 validate_coredump_safety(); 2649 return error; 2650 } 2651 2652 #ifdef CONFIG_COREDUMP 2653 static int proc_dostring_coredump(struct ctl_table *table, int write, 2654 void __user *buffer, size_t *lenp, loff_t *ppos) 2655 { 2656 int error = proc_dostring(table, write, buffer, lenp, ppos); 2657 if (!error) 2658 validate_coredump_safety(); 2659 return error; 2660 } 2661 #endif 2662 2663 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2664 void __user *buffer, 2665 size_t *lenp, loff_t *ppos, 2666 unsigned long convmul, 2667 unsigned long convdiv) 2668 { 2669 unsigned long *i, *min, *max; 2670 int vleft, first = 1, err = 0; 2671 size_t left; 2672 char *kbuf = NULL, *p; 2673 2674 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2675 *lenp = 0; 2676 return 0; 2677 } 2678 2679 i = (unsigned long *) data; 2680 min = (unsigned long *) table->extra1; 2681 max = (unsigned long *) table->extra2; 2682 vleft = table->maxlen / sizeof(unsigned long); 2683 left = *lenp; 2684 2685 if (write) { 2686 if (proc_first_pos_non_zero_ignore(ppos, table)) 2687 goto out; 2688 2689 if (left > PAGE_SIZE - 1) 2690 left = PAGE_SIZE - 1; 2691 p = kbuf = memdup_user_nul(buffer, left); 2692 if (IS_ERR(kbuf)) 2693 return PTR_ERR(kbuf); 2694 } 2695 2696 for (; left && vleft--; i++, first = 0) { 2697 unsigned long val; 2698 2699 if (write) { 2700 bool neg; 2701 2702 left -= proc_skip_spaces(&p); 2703 2704 err = proc_get_long(&p, &left, &val, &neg, 2705 proc_wspace_sep, 2706 sizeof(proc_wspace_sep), NULL); 2707 if (err) 2708 break; 2709 if (neg) 2710 continue; 2711 val = convmul * val / convdiv; 2712 if ((min && val < *min) || (max && val > *max)) 2713 continue; 2714 *i = val; 2715 } else { 2716 val = convdiv * (*i) / convmul; 2717 if (!first) { 2718 err = proc_put_char(&buffer, &left, '\t'); 2719 if (err) 2720 break; 2721 } 2722 err = proc_put_long(&buffer, &left, val, false); 2723 if (err) 2724 break; 2725 } 2726 } 2727 2728 if (!write && !first && left && !err) 2729 err = proc_put_char(&buffer, &left, '\n'); 2730 if (write && !err) 2731 left -= proc_skip_spaces(&p); 2732 if (write) { 2733 kfree(kbuf); 2734 if (first) 2735 return err ? : -EINVAL; 2736 } 2737 *lenp -= left; 2738 out: 2739 *ppos += *lenp; 2740 return err; 2741 } 2742 2743 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2744 void __user *buffer, 2745 size_t *lenp, loff_t *ppos, 2746 unsigned long convmul, 2747 unsigned long convdiv) 2748 { 2749 return __do_proc_doulongvec_minmax(table->data, table, write, 2750 buffer, lenp, ppos, convmul, convdiv); 2751 } 2752 2753 /** 2754 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2755 * @table: the sysctl table 2756 * @write: %TRUE if this is a write to the sysctl file 2757 * @buffer: the user buffer 2758 * @lenp: the size of the user buffer 2759 * @ppos: file position 2760 * 2761 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2762 * values from/to the user buffer, treated as an ASCII string. 2763 * 2764 * This routine will ensure the values are within the range specified by 2765 * table->extra1 (min) and table->extra2 (max). 2766 * 2767 * Returns 0 on success. 2768 */ 2769 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2770 void __user *buffer, size_t *lenp, loff_t *ppos) 2771 { 2772 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2773 } 2774 2775 /** 2776 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2777 * @table: the sysctl table 2778 * @write: %TRUE if this is a write to the sysctl file 2779 * @buffer: the user buffer 2780 * @lenp: the size of the user buffer 2781 * @ppos: file position 2782 * 2783 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2784 * values from/to the user buffer, treated as an ASCII string. The values 2785 * are treated as milliseconds, and converted to jiffies when they are stored. 2786 * 2787 * This routine will ensure the values are within the range specified by 2788 * table->extra1 (min) and table->extra2 (max). 2789 * 2790 * Returns 0 on success. 2791 */ 2792 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2793 void __user *buffer, 2794 size_t *lenp, loff_t *ppos) 2795 { 2796 return do_proc_doulongvec_minmax(table, write, buffer, 2797 lenp, ppos, HZ, 1000l); 2798 } 2799 2800 2801 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2802 int *valp, 2803 int write, void *data) 2804 { 2805 if (write) { 2806 if (*lvalp > INT_MAX / HZ) 2807 return 1; 2808 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2809 } else { 2810 int val = *valp; 2811 unsigned long lval; 2812 if (val < 0) { 2813 *negp = true; 2814 lval = -(unsigned long)val; 2815 } else { 2816 *negp = false; 2817 lval = (unsigned long)val; 2818 } 2819 *lvalp = lval / HZ; 2820 } 2821 return 0; 2822 } 2823 2824 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2825 int *valp, 2826 int write, void *data) 2827 { 2828 if (write) { 2829 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2830 return 1; 2831 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2832 } else { 2833 int val = *valp; 2834 unsigned long lval; 2835 if (val < 0) { 2836 *negp = true; 2837 lval = -(unsigned long)val; 2838 } else { 2839 *negp = false; 2840 lval = (unsigned long)val; 2841 } 2842 *lvalp = jiffies_to_clock_t(lval); 2843 } 2844 return 0; 2845 } 2846 2847 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2848 int *valp, 2849 int write, void *data) 2850 { 2851 if (write) { 2852 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2853 2854 if (jif > INT_MAX) 2855 return 1; 2856 *valp = (int)jif; 2857 } else { 2858 int val = *valp; 2859 unsigned long lval; 2860 if (val < 0) { 2861 *negp = true; 2862 lval = -(unsigned long)val; 2863 } else { 2864 *negp = false; 2865 lval = (unsigned long)val; 2866 } 2867 *lvalp = jiffies_to_msecs(lval); 2868 } 2869 return 0; 2870 } 2871 2872 /** 2873 * proc_dointvec_jiffies - read a vector of integers as seconds 2874 * @table: the sysctl table 2875 * @write: %TRUE if this is a write to the sysctl file 2876 * @buffer: the user buffer 2877 * @lenp: the size of the user buffer 2878 * @ppos: file position 2879 * 2880 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2881 * values from/to the user buffer, treated as an ASCII string. 2882 * The values read are assumed to be in seconds, and are converted into 2883 * jiffies. 2884 * 2885 * Returns 0 on success. 2886 */ 2887 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2888 void __user *buffer, size_t *lenp, loff_t *ppos) 2889 { 2890 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2891 do_proc_dointvec_jiffies_conv,NULL); 2892 } 2893 2894 /** 2895 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2896 * @table: the sysctl table 2897 * @write: %TRUE if this is a write to the sysctl file 2898 * @buffer: the user buffer 2899 * @lenp: the size of the user buffer 2900 * @ppos: pointer to the file position 2901 * 2902 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2903 * values from/to the user buffer, treated as an ASCII string. 2904 * The values read are assumed to be in 1/USER_HZ seconds, and 2905 * are converted into jiffies. 2906 * 2907 * Returns 0 on success. 2908 */ 2909 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2910 void __user *buffer, size_t *lenp, loff_t *ppos) 2911 { 2912 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2913 do_proc_dointvec_userhz_jiffies_conv,NULL); 2914 } 2915 2916 /** 2917 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2918 * @table: the sysctl table 2919 * @write: %TRUE if this is a write to the sysctl file 2920 * @buffer: the user buffer 2921 * @lenp: the size of the user buffer 2922 * @ppos: file position 2923 * @ppos: the current position in the file 2924 * 2925 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2926 * values from/to the user buffer, treated as an ASCII string. 2927 * The values read are assumed to be in 1/1000 seconds, and 2928 * are converted into jiffies. 2929 * 2930 * Returns 0 on success. 2931 */ 2932 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2933 void __user *buffer, size_t *lenp, loff_t *ppos) 2934 { 2935 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2936 do_proc_dointvec_ms_jiffies_conv, NULL); 2937 } 2938 2939 static int proc_do_cad_pid(struct ctl_table *table, int write, 2940 void __user *buffer, size_t *lenp, loff_t *ppos) 2941 { 2942 struct pid *new_pid; 2943 pid_t tmp; 2944 int r; 2945 2946 tmp = pid_vnr(cad_pid); 2947 2948 r = __do_proc_dointvec(&tmp, table, write, buffer, 2949 lenp, ppos, NULL, NULL); 2950 if (r || !write) 2951 return r; 2952 2953 new_pid = find_get_pid(tmp); 2954 if (!new_pid) 2955 return -ESRCH; 2956 2957 put_pid(xchg(&cad_pid, new_pid)); 2958 return 0; 2959 } 2960 2961 /** 2962 * proc_do_large_bitmap - read/write from/to a large bitmap 2963 * @table: the sysctl table 2964 * @write: %TRUE if this is a write to the sysctl file 2965 * @buffer: the user buffer 2966 * @lenp: the size of the user buffer 2967 * @ppos: file position 2968 * 2969 * The bitmap is stored at table->data and the bitmap length (in bits) 2970 * in table->maxlen. 2971 * 2972 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2973 * large bitmaps may be represented in a compact manner. Writing into 2974 * the file will clear the bitmap then update it with the given input. 2975 * 2976 * Returns 0 on success. 2977 */ 2978 int proc_do_large_bitmap(struct ctl_table *table, int write, 2979 void __user *buffer, size_t *lenp, loff_t *ppos) 2980 { 2981 int err = 0; 2982 bool first = 1; 2983 size_t left = *lenp; 2984 unsigned long bitmap_len = table->maxlen; 2985 unsigned long *bitmap = *(unsigned long **) table->data; 2986 unsigned long *tmp_bitmap = NULL; 2987 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2988 2989 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2990 *lenp = 0; 2991 return 0; 2992 } 2993 2994 if (write) { 2995 char *kbuf, *p; 2996 2997 if (left > PAGE_SIZE - 1) 2998 left = PAGE_SIZE - 1; 2999 3000 p = kbuf = memdup_user_nul(buffer, left); 3001 if (IS_ERR(kbuf)) 3002 return PTR_ERR(kbuf); 3003 3004 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 3005 GFP_KERNEL); 3006 if (!tmp_bitmap) { 3007 kfree(kbuf); 3008 return -ENOMEM; 3009 } 3010 proc_skip_char(&p, &left, '\n'); 3011 while (!err && left) { 3012 unsigned long val_a, val_b; 3013 bool neg; 3014 3015 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3016 sizeof(tr_a), &c); 3017 if (err) 3018 break; 3019 if (val_a >= bitmap_len || neg) { 3020 err = -EINVAL; 3021 break; 3022 } 3023 3024 val_b = val_a; 3025 if (left) { 3026 p++; 3027 left--; 3028 } 3029 3030 if (c == '-') { 3031 err = proc_get_long(&p, &left, &val_b, 3032 &neg, tr_b, sizeof(tr_b), 3033 &c); 3034 if (err) 3035 break; 3036 if (val_b >= bitmap_len || neg || 3037 val_a > val_b) { 3038 err = -EINVAL; 3039 break; 3040 } 3041 if (left) { 3042 p++; 3043 left--; 3044 } 3045 } 3046 3047 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3048 first = 0; 3049 proc_skip_char(&p, &left, '\n'); 3050 } 3051 kfree(kbuf); 3052 } else { 3053 unsigned long bit_a, bit_b = 0; 3054 3055 while (left) { 3056 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3057 if (bit_a >= bitmap_len) 3058 break; 3059 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3060 bit_a + 1) - 1; 3061 3062 if (!first) { 3063 err = proc_put_char(&buffer, &left, ','); 3064 if (err) 3065 break; 3066 } 3067 err = proc_put_long(&buffer, &left, bit_a, false); 3068 if (err) 3069 break; 3070 if (bit_a != bit_b) { 3071 err = proc_put_char(&buffer, &left, '-'); 3072 if (err) 3073 break; 3074 err = proc_put_long(&buffer, &left, bit_b, false); 3075 if (err) 3076 break; 3077 } 3078 3079 first = 0; bit_b++; 3080 } 3081 if (!err) 3082 err = proc_put_char(&buffer, &left, '\n'); 3083 } 3084 3085 if (!err) { 3086 if (write) { 3087 if (*ppos) 3088 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3089 else 3090 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3091 } 3092 kfree(tmp_bitmap); 3093 *lenp -= left; 3094 *ppos += *lenp; 3095 return 0; 3096 } else { 3097 kfree(tmp_bitmap); 3098 return err; 3099 } 3100 } 3101 3102 #else /* CONFIG_PROC_SYSCTL */ 3103 3104 int proc_dostring(struct ctl_table *table, int write, 3105 void __user *buffer, size_t *lenp, loff_t *ppos) 3106 { 3107 return -ENOSYS; 3108 } 3109 3110 int proc_dointvec(struct ctl_table *table, int write, 3111 void __user *buffer, size_t *lenp, loff_t *ppos) 3112 { 3113 return -ENOSYS; 3114 } 3115 3116 int proc_douintvec(struct ctl_table *table, int write, 3117 void __user *buffer, size_t *lenp, loff_t *ppos) 3118 { 3119 return -ENOSYS; 3120 } 3121 3122 int proc_dointvec_minmax(struct ctl_table *table, int write, 3123 void __user *buffer, size_t *lenp, loff_t *ppos) 3124 { 3125 return -ENOSYS; 3126 } 3127 3128 int proc_douintvec_minmax(struct ctl_table *table, int write, 3129 void __user *buffer, size_t *lenp, loff_t *ppos) 3130 { 3131 return -ENOSYS; 3132 } 3133 3134 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3135 void __user *buffer, size_t *lenp, loff_t *ppos) 3136 { 3137 return -ENOSYS; 3138 } 3139 3140 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3141 void __user *buffer, size_t *lenp, loff_t *ppos) 3142 { 3143 return -ENOSYS; 3144 } 3145 3146 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3147 void __user *buffer, size_t *lenp, loff_t *ppos) 3148 { 3149 return -ENOSYS; 3150 } 3151 3152 int proc_doulongvec_minmax(struct ctl_table *table, int write, 3153 void __user *buffer, size_t *lenp, loff_t *ppos) 3154 { 3155 return -ENOSYS; 3156 } 3157 3158 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 3159 void __user *buffer, 3160 size_t *lenp, loff_t *ppos) 3161 { 3162 return -ENOSYS; 3163 } 3164 3165 3166 #endif /* CONFIG_PROC_SYSCTL */ 3167 3168 /* 3169 * No sense putting this after each symbol definition, twice, 3170 * exception granted :-) 3171 */ 3172 EXPORT_SYMBOL(proc_dointvec); 3173 EXPORT_SYMBOL(proc_douintvec); 3174 EXPORT_SYMBOL(proc_dointvec_jiffies); 3175 EXPORT_SYMBOL(proc_dointvec_minmax); 3176 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3177 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3178 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3179 EXPORT_SYMBOL(proc_dostring); 3180 EXPORT_SYMBOL(proc_doulongvec_minmax); 3181 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3182