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 = "watchdog_cpumask", 905 .data = &watchdog_cpumask_bits, 906 .maxlen = NR_CPUS, 907 .mode = 0644, 908 .proc_handler = proc_watchdog_cpumask, 909 }, 910 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 911 { 912 .procname = "soft_watchdog", 913 .data = &soft_watchdog_enabled, 914 .maxlen = sizeof (int), 915 .mode = 0644, 916 .proc_handler = proc_soft_watchdog, 917 .extra1 = &zero, 918 .extra2 = &one, 919 }, 920 { 921 .procname = "softlockup_panic", 922 .data = &softlockup_panic, 923 .maxlen = sizeof(int), 924 .mode = 0644, 925 .proc_handler = proc_dointvec_minmax, 926 .extra1 = &zero, 927 .extra2 = &one, 928 }, 929 #ifdef CONFIG_SMP 930 { 931 .procname = "softlockup_all_cpu_backtrace", 932 .data = &sysctl_softlockup_all_cpu_backtrace, 933 .maxlen = sizeof(int), 934 .mode = 0644, 935 .proc_handler = proc_dointvec_minmax, 936 .extra1 = &zero, 937 .extra2 = &one, 938 }, 939 #endif /* CONFIG_SMP */ 940 #endif 941 #ifdef CONFIG_HARDLOCKUP_DETECTOR 942 { 943 .procname = "hardlockup_panic", 944 .data = &hardlockup_panic, 945 .maxlen = sizeof(int), 946 .mode = 0644, 947 .proc_handler = proc_dointvec_minmax, 948 .extra1 = &zero, 949 .extra2 = &one, 950 }, 951 #ifdef CONFIG_SMP 952 { 953 .procname = "hardlockup_all_cpu_backtrace", 954 .data = &sysctl_hardlockup_all_cpu_backtrace, 955 .maxlen = sizeof(int), 956 .mode = 0644, 957 .proc_handler = proc_dointvec_minmax, 958 .extra1 = &zero, 959 .extra2 = &one, 960 }, 961 #endif /* CONFIG_SMP */ 962 #endif 963 #endif 964 965 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 966 { 967 .procname = "unknown_nmi_panic", 968 .data = &unknown_nmi_panic, 969 .maxlen = sizeof (int), 970 .mode = 0644, 971 .proc_handler = proc_dointvec, 972 }, 973 #endif 974 #if defined(CONFIG_X86) 975 { 976 .procname = "panic_on_unrecovered_nmi", 977 .data = &panic_on_unrecovered_nmi, 978 .maxlen = sizeof(int), 979 .mode = 0644, 980 .proc_handler = proc_dointvec, 981 }, 982 { 983 .procname = "panic_on_io_nmi", 984 .data = &panic_on_io_nmi, 985 .maxlen = sizeof(int), 986 .mode = 0644, 987 .proc_handler = proc_dointvec, 988 }, 989 #ifdef CONFIG_DEBUG_STACKOVERFLOW 990 { 991 .procname = "panic_on_stackoverflow", 992 .data = &sysctl_panic_on_stackoverflow, 993 .maxlen = sizeof(int), 994 .mode = 0644, 995 .proc_handler = proc_dointvec, 996 }, 997 #endif 998 { 999 .procname = "bootloader_type", 1000 .data = &bootloader_type, 1001 .maxlen = sizeof (int), 1002 .mode = 0444, 1003 .proc_handler = proc_dointvec, 1004 }, 1005 { 1006 .procname = "bootloader_version", 1007 .data = &bootloader_version, 1008 .maxlen = sizeof (int), 1009 .mode = 0444, 1010 .proc_handler = proc_dointvec, 1011 }, 1012 { 1013 .procname = "io_delay_type", 1014 .data = &io_delay_type, 1015 .maxlen = sizeof(int), 1016 .mode = 0644, 1017 .proc_handler = proc_dointvec, 1018 }, 1019 #endif 1020 #if defined(CONFIG_MMU) 1021 { 1022 .procname = "randomize_va_space", 1023 .data = &randomize_va_space, 1024 .maxlen = sizeof(int), 1025 .mode = 0644, 1026 .proc_handler = proc_dointvec, 1027 }, 1028 #endif 1029 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1030 { 1031 .procname = "spin_retry", 1032 .data = &spin_retry, 1033 .maxlen = sizeof (int), 1034 .mode = 0644, 1035 .proc_handler = proc_dointvec, 1036 }, 1037 #endif 1038 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1039 { 1040 .procname = "acpi_video_flags", 1041 .data = &acpi_realmode_flags, 1042 .maxlen = sizeof (unsigned long), 1043 .mode = 0644, 1044 .proc_handler = proc_doulongvec_minmax, 1045 }, 1046 #endif 1047 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1048 { 1049 .procname = "ignore-unaligned-usertrap", 1050 .data = &no_unaligned_warning, 1051 .maxlen = sizeof (int), 1052 .mode = 0644, 1053 .proc_handler = proc_dointvec, 1054 }, 1055 #endif 1056 #ifdef CONFIG_IA64 1057 { 1058 .procname = "unaligned-dump-stack", 1059 .data = &unaligned_dump_stack, 1060 .maxlen = sizeof (int), 1061 .mode = 0644, 1062 .proc_handler = proc_dointvec, 1063 }, 1064 #endif 1065 #ifdef CONFIG_DETECT_HUNG_TASK 1066 { 1067 .procname = "hung_task_panic", 1068 .data = &sysctl_hung_task_panic, 1069 .maxlen = sizeof(int), 1070 .mode = 0644, 1071 .proc_handler = proc_dointvec_minmax, 1072 .extra1 = &zero, 1073 .extra2 = &one, 1074 }, 1075 { 1076 .procname = "hung_task_check_count", 1077 .data = &sysctl_hung_task_check_count, 1078 .maxlen = sizeof(int), 1079 .mode = 0644, 1080 .proc_handler = proc_dointvec_minmax, 1081 .extra1 = &zero, 1082 }, 1083 { 1084 .procname = "hung_task_timeout_secs", 1085 .data = &sysctl_hung_task_timeout_secs, 1086 .maxlen = sizeof(unsigned long), 1087 .mode = 0644, 1088 .proc_handler = proc_dohung_task_timeout_secs, 1089 .extra2 = &hung_task_timeout_max, 1090 }, 1091 { 1092 .procname = "hung_task_warnings", 1093 .data = &sysctl_hung_task_warnings, 1094 .maxlen = sizeof(int), 1095 .mode = 0644, 1096 .proc_handler = proc_dointvec_minmax, 1097 .extra1 = &neg_one, 1098 }, 1099 #endif 1100 #ifdef CONFIG_RT_MUTEXES 1101 { 1102 .procname = "max_lock_depth", 1103 .data = &max_lock_depth, 1104 .maxlen = sizeof(int), 1105 .mode = 0644, 1106 .proc_handler = proc_dointvec, 1107 }, 1108 #endif 1109 { 1110 .procname = "poweroff_cmd", 1111 .data = &poweroff_cmd, 1112 .maxlen = POWEROFF_CMD_PATH_LEN, 1113 .mode = 0644, 1114 .proc_handler = proc_dostring, 1115 }, 1116 #ifdef CONFIG_KEYS 1117 { 1118 .procname = "keys", 1119 .mode = 0555, 1120 .child = key_sysctls, 1121 }, 1122 #endif 1123 #ifdef CONFIG_PERF_EVENTS 1124 /* 1125 * User-space scripts rely on the existence of this file 1126 * as a feature check for perf_events being enabled. 1127 * 1128 * So it's an ABI, do not remove! 1129 */ 1130 { 1131 .procname = "perf_event_paranoid", 1132 .data = &sysctl_perf_event_paranoid, 1133 .maxlen = sizeof(sysctl_perf_event_paranoid), 1134 .mode = 0644, 1135 .proc_handler = proc_dointvec, 1136 }, 1137 { 1138 .procname = "perf_event_mlock_kb", 1139 .data = &sysctl_perf_event_mlock, 1140 .maxlen = sizeof(sysctl_perf_event_mlock), 1141 .mode = 0644, 1142 .proc_handler = proc_dointvec, 1143 }, 1144 { 1145 .procname = "perf_event_max_sample_rate", 1146 .data = &sysctl_perf_event_sample_rate, 1147 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1148 .mode = 0644, 1149 .proc_handler = perf_proc_update_handler, 1150 .extra1 = &one, 1151 }, 1152 { 1153 .procname = "perf_cpu_time_max_percent", 1154 .data = &sysctl_perf_cpu_time_max_percent, 1155 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1156 .mode = 0644, 1157 .proc_handler = perf_cpu_time_max_percent_handler, 1158 .extra1 = &zero, 1159 .extra2 = &one_hundred, 1160 }, 1161 { 1162 .procname = "perf_event_max_stack", 1163 .data = &sysctl_perf_event_max_stack, 1164 .maxlen = sizeof(sysctl_perf_event_max_stack), 1165 .mode = 0644, 1166 .proc_handler = perf_event_max_stack_handler, 1167 .extra1 = &zero, 1168 .extra2 = &six_hundred_forty_kb, 1169 }, 1170 { 1171 .procname = "perf_event_max_contexts_per_stack", 1172 .data = &sysctl_perf_event_max_contexts_per_stack, 1173 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1174 .mode = 0644, 1175 .proc_handler = perf_event_max_stack_handler, 1176 .extra1 = &zero, 1177 .extra2 = &one_thousand, 1178 }, 1179 #endif 1180 #ifdef CONFIG_KMEMCHECK 1181 { 1182 .procname = "kmemcheck", 1183 .data = &kmemcheck_enabled, 1184 .maxlen = sizeof(int), 1185 .mode = 0644, 1186 .proc_handler = proc_dointvec, 1187 }, 1188 #endif 1189 { 1190 .procname = "panic_on_warn", 1191 .data = &panic_on_warn, 1192 .maxlen = sizeof(int), 1193 .mode = 0644, 1194 .proc_handler = proc_dointvec_minmax, 1195 .extra1 = &zero, 1196 .extra2 = &one, 1197 }, 1198 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1199 { 1200 .procname = "timer_migration", 1201 .data = &sysctl_timer_migration, 1202 .maxlen = sizeof(unsigned int), 1203 .mode = 0644, 1204 .proc_handler = timer_migration_handler, 1205 .extra1 = &zero, 1206 .extra2 = &one, 1207 }, 1208 #endif 1209 #ifdef CONFIG_BPF_SYSCALL 1210 { 1211 .procname = "unprivileged_bpf_disabled", 1212 .data = &sysctl_unprivileged_bpf_disabled, 1213 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1214 .mode = 0644, 1215 /* only handle a transition from default "0" to "1" */ 1216 .proc_handler = proc_dointvec_minmax, 1217 .extra1 = &one, 1218 .extra2 = &one, 1219 }, 1220 #endif 1221 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1222 { 1223 .procname = "panic_on_rcu_stall", 1224 .data = &sysctl_panic_on_rcu_stall, 1225 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1226 .mode = 0644, 1227 .proc_handler = proc_dointvec_minmax, 1228 .extra1 = &zero, 1229 .extra2 = &one, 1230 }, 1231 #endif 1232 { } 1233 }; 1234 1235 static struct ctl_table vm_table[] = { 1236 { 1237 .procname = "overcommit_memory", 1238 .data = &sysctl_overcommit_memory, 1239 .maxlen = sizeof(sysctl_overcommit_memory), 1240 .mode = 0644, 1241 .proc_handler = proc_dointvec_minmax, 1242 .extra1 = &zero, 1243 .extra2 = &two, 1244 }, 1245 { 1246 .procname = "panic_on_oom", 1247 .data = &sysctl_panic_on_oom, 1248 .maxlen = sizeof(sysctl_panic_on_oom), 1249 .mode = 0644, 1250 .proc_handler = proc_dointvec_minmax, 1251 .extra1 = &zero, 1252 .extra2 = &two, 1253 }, 1254 { 1255 .procname = "oom_kill_allocating_task", 1256 .data = &sysctl_oom_kill_allocating_task, 1257 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1258 .mode = 0644, 1259 .proc_handler = proc_dointvec, 1260 }, 1261 { 1262 .procname = "oom_dump_tasks", 1263 .data = &sysctl_oom_dump_tasks, 1264 .maxlen = sizeof(sysctl_oom_dump_tasks), 1265 .mode = 0644, 1266 .proc_handler = proc_dointvec, 1267 }, 1268 { 1269 .procname = "overcommit_ratio", 1270 .data = &sysctl_overcommit_ratio, 1271 .maxlen = sizeof(sysctl_overcommit_ratio), 1272 .mode = 0644, 1273 .proc_handler = overcommit_ratio_handler, 1274 }, 1275 { 1276 .procname = "overcommit_kbytes", 1277 .data = &sysctl_overcommit_kbytes, 1278 .maxlen = sizeof(sysctl_overcommit_kbytes), 1279 .mode = 0644, 1280 .proc_handler = overcommit_kbytes_handler, 1281 }, 1282 { 1283 .procname = "page-cluster", 1284 .data = &page_cluster, 1285 .maxlen = sizeof(int), 1286 .mode = 0644, 1287 .proc_handler = proc_dointvec_minmax, 1288 .extra1 = &zero, 1289 }, 1290 { 1291 .procname = "dirty_background_ratio", 1292 .data = &dirty_background_ratio, 1293 .maxlen = sizeof(dirty_background_ratio), 1294 .mode = 0644, 1295 .proc_handler = dirty_background_ratio_handler, 1296 .extra1 = &zero, 1297 .extra2 = &one_hundred, 1298 }, 1299 { 1300 .procname = "dirty_background_bytes", 1301 .data = &dirty_background_bytes, 1302 .maxlen = sizeof(dirty_background_bytes), 1303 .mode = 0644, 1304 .proc_handler = dirty_background_bytes_handler, 1305 .extra1 = &one_ul, 1306 }, 1307 { 1308 .procname = "dirty_ratio", 1309 .data = &vm_dirty_ratio, 1310 .maxlen = sizeof(vm_dirty_ratio), 1311 .mode = 0644, 1312 .proc_handler = dirty_ratio_handler, 1313 .extra1 = &zero, 1314 .extra2 = &one_hundred, 1315 }, 1316 { 1317 .procname = "dirty_bytes", 1318 .data = &vm_dirty_bytes, 1319 .maxlen = sizeof(vm_dirty_bytes), 1320 .mode = 0644, 1321 .proc_handler = dirty_bytes_handler, 1322 .extra1 = &dirty_bytes_min, 1323 }, 1324 { 1325 .procname = "dirty_writeback_centisecs", 1326 .data = &dirty_writeback_interval, 1327 .maxlen = sizeof(dirty_writeback_interval), 1328 .mode = 0644, 1329 .proc_handler = dirty_writeback_centisecs_handler, 1330 }, 1331 { 1332 .procname = "dirty_expire_centisecs", 1333 .data = &dirty_expire_interval, 1334 .maxlen = sizeof(dirty_expire_interval), 1335 .mode = 0644, 1336 .proc_handler = proc_dointvec_minmax, 1337 .extra1 = &zero, 1338 }, 1339 { 1340 .procname = "dirtytime_expire_seconds", 1341 .data = &dirtytime_expire_interval, 1342 .maxlen = sizeof(dirty_expire_interval), 1343 .mode = 0644, 1344 .proc_handler = dirtytime_interval_handler, 1345 .extra1 = &zero, 1346 }, 1347 { 1348 .procname = "nr_pdflush_threads", 1349 .mode = 0444 /* read-only */, 1350 .proc_handler = pdflush_proc_obsolete, 1351 }, 1352 { 1353 .procname = "swappiness", 1354 .data = &vm_swappiness, 1355 .maxlen = sizeof(vm_swappiness), 1356 .mode = 0644, 1357 .proc_handler = proc_dointvec_minmax, 1358 .extra1 = &zero, 1359 .extra2 = &one_hundred, 1360 }, 1361 #ifdef CONFIG_HUGETLB_PAGE 1362 { 1363 .procname = "nr_hugepages", 1364 .data = NULL, 1365 .maxlen = sizeof(unsigned long), 1366 .mode = 0644, 1367 .proc_handler = hugetlb_sysctl_handler, 1368 }, 1369 #ifdef CONFIG_NUMA 1370 { 1371 .procname = "nr_hugepages_mempolicy", 1372 .data = NULL, 1373 .maxlen = sizeof(unsigned long), 1374 .mode = 0644, 1375 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1376 }, 1377 #endif 1378 { 1379 .procname = "hugetlb_shm_group", 1380 .data = &sysctl_hugetlb_shm_group, 1381 .maxlen = sizeof(gid_t), 1382 .mode = 0644, 1383 .proc_handler = proc_dointvec, 1384 }, 1385 { 1386 .procname = "hugepages_treat_as_movable", 1387 .data = &hugepages_treat_as_movable, 1388 .maxlen = sizeof(int), 1389 .mode = 0644, 1390 .proc_handler = proc_dointvec, 1391 }, 1392 { 1393 .procname = "nr_overcommit_hugepages", 1394 .data = NULL, 1395 .maxlen = sizeof(unsigned long), 1396 .mode = 0644, 1397 .proc_handler = hugetlb_overcommit_handler, 1398 }, 1399 #endif 1400 { 1401 .procname = "lowmem_reserve_ratio", 1402 .data = &sysctl_lowmem_reserve_ratio, 1403 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1404 .mode = 0644, 1405 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1406 }, 1407 { 1408 .procname = "drop_caches", 1409 .data = &sysctl_drop_caches, 1410 .maxlen = sizeof(int), 1411 .mode = 0644, 1412 .proc_handler = drop_caches_sysctl_handler, 1413 .extra1 = &one, 1414 .extra2 = &four, 1415 }, 1416 #ifdef CONFIG_COMPACTION 1417 { 1418 .procname = "compact_memory", 1419 .data = &sysctl_compact_memory, 1420 .maxlen = sizeof(int), 1421 .mode = 0200, 1422 .proc_handler = sysctl_compaction_handler, 1423 }, 1424 { 1425 .procname = "extfrag_threshold", 1426 .data = &sysctl_extfrag_threshold, 1427 .maxlen = sizeof(int), 1428 .mode = 0644, 1429 .proc_handler = sysctl_extfrag_handler, 1430 .extra1 = &min_extfrag_threshold, 1431 .extra2 = &max_extfrag_threshold, 1432 }, 1433 { 1434 .procname = "compact_unevictable_allowed", 1435 .data = &sysctl_compact_unevictable_allowed, 1436 .maxlen = sizeof(int), 1437 .mode = 0644, 1438 .proc_handler = proc_dointvec, 1439 .extra1 = &zero, 1440 .extra2 = &one, 1441 }, 1442 1443 #endif /* CONFIG_COMPACTION */ 1444 { 1445 .procname = "min_free_kbytes", 1446 .data = &min_free_kbytes, 1447 .maxlen = sizeof(min_free_kbytes), 1448 .mode = 0644, 1449 .proc_handler = min_free_kbytes_sysctl_handler, 1450 .extra1 = &zero, 1451 }, 1452 { 1453 .procname = "watermark_scale_factor", 1454 .data = &watermark_scale_factor, 1455 .maxlen = sizeof(watermark_scale_factor), 1456 .mode = 0644, 1457 .proc_handler = watermark_scale_factor_sysctl_handler, 1458 .extra1 = &one, 1459 .extra2 = &one_thousand, 1460 }, 1461 { 1462 .procname = "percpu_pagelist_fraction", 1463 .data = &percpu_pagelist_fraction, 1464 .maxlen = sizeof(percpu_pagelist_fraction), 1465 .mode = 0644, 1466 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1467 .extra1 = &zero, 1468 }, 1469 #ifdef CONFIG_MMU 1470 { 1471 .procname = "max_map_count", 1472 .data = &sysctl_max_map_count, 1473 .maxlen = sizeof(sysctl_max_map_count), 1474 .mode = 0644, 1475 .proc_handler = proc_dointvec_minmax, 1476 .extra1 = &zero, 1477 }, 1478 #else 1479 { 1480 .procname = "nr_trim_pages", 1481 .data = &sysctl_nr_trim_pages, 1482 .maxlen = sizeof(sysctl_nr_trim_pages), 1483 .mode = 0644, 1484 .proc_handler = proc_dointvec_minmax, 1485 .extra1 = &zero, 1486 }, 1487 #endif 1488 { 1489 .procname = "laptop_mode", 1490 .data = &laptop_mode, 1491 .maxlen = sizeof(laptop_mode), 1492 .mode = 0644, 1493 .proc_handler = proc_dointvec_jiffies, 1494 }, 1495 { 1496 .procname = "block_dump", 1497 .data = &block_dump, 1498 .maxlen = sizeof(block_dump), 1499 .mode = 0644, 1500 .proc_handler = proc_dointvec, 1501 .extra1 = &zero, 1502 }, 1503 { 1504 .procname = "vfs_cache_pressure", 1505 .data = &sysctl_vfs_cache_pressure, 1506 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1507 .mode = 0644, 1508 .proc_handler = proc_dointvec, 1509 .extra1 = &zero, 1510 }, 1511 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1512 { 1513 .procname = "legacy_va_layout", 1514 .data = &sysctl_legacy_va_layout, 1515 .maxlen = sizeof(sysctl_legacy_va_layout), 1516 .mode = 0644, 1517 .proc_handler = proc_dointvec, 1518 .extra1 = &zero, 1519 }, 1520 #endif 1521 #ifdef CONFIG_NUMA 1522 { 1523 .procname = "zone_reclaim_mode", 1524 .data = &node_reclaim_mode, 1525 .maxlen = sizeof(node_reclaim_mode), 1526 .mode = 0644, 1527 .proc_handler = proc_dointvec, 1528 .extra1 = &zero, 1529 }, 1530 { 1531 .procname = "min_unmapped_ratio", 1532 .data = &sysctl_min_unmapped_ratio, 1533 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1534 .mode = 0644, 1535 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1536 .extra1 = &zero, 1537 .extra2 = &one_hundred, 1538 }, 1539 { 1540 .procname = "min_slab_ratio", 1541 .data = &sysctl_min_slab_ratio, 1542 .maxlen = sizeof(sysctl_min_slab_ratio), 1543 .mode = 0644, 1544 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1545 .extra1 = &zero, 1546 .extra2 = &one_hundred, 1547 }, 1548 #endif 1549 #ifdef CONFIG_SMP 1550 { 1551 .procname = "stat_interval", 1552 .data = &sysctl_stat_interval, 1553 .maxlen = sizeof(sysctl_stat_interval), 1554 .mode = 0644, 1555 .proc_handler = proc_dointvec_jiffies, 1556 }, 1557 { 1558 .procname = "stat_refresh", 1559 .data = NULL, 1560 .maxlen = 0, 1561 .mode = 0600, 1562 .proc_handler = vmstat_refresh, 1563 }, 1564 #endif 1565 #ifdef CONFIG_MMU 1566 { 1567 .procname = "mmap_min_addr", 1568 .data = &dac_mmap_min_addr, 1569 .maxlen = sizeof(unsigned long), 1570 .mode = 0644, 1571 .proc_handler = mmap_min_addr_handler, 1572 }, 1573 #endif 1574 #ifdef CONFIG_NUMA 1575 { 1576 .procname = "numa_zonelist_order", 1577 .data = &numa_zonelist_order, 1578 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1579 .mode = 0644, 1580 .proc_handler = numa_zonelist_order_handler, 1581 }, 1582 #endif 1583 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1584 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1585 { 1586 .procname = "vdso_enabled", 1587 #ifdef CONFIG_X86_32 1588 .data = &vdso32_enabled, 1589 .maxlen = sizeof(vdso32_enabled), 1590 #else 1591 .data = &vdso_enabled, 1592 .maxlen = sizeof(vdso_enabled), 1593 #endif 1594 .mode = 0644, 1595 .proc_handler = proc_dointvec, 1596 .extra1 = &zero, 1597 }, 1598 #endif 1599 #ifdef CONFIG_HIGHMEM 1600 { 1601 .procname = "highmem_is_dirtyable", 1602 .data = &vm_highmem_is_dirtyable, 1603 .maxlen = sizeof(vm_highmem_is_dirtyable), 1604 .mode = 0644, 1605 .proc_handler = proc_dointvec_minmax, 1606 .extra1 = &zero, 1607 .extra2 = &one, 1608 }, 1609 #endif 1610 #ifdef CONFIG_MEMORY_FAILURE 1611 { 1612 .procname = "memory_failure_early_kill", 1613 .data = &sysctl_memory_failure_early_kill, 1614 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1615 .mode = 0644, 1616 .proc_handler = proc_dointvec_minmax, 1617 .extra1 = &zero, 1618 .extra2 = &one, 1619 }, 1620 { 1621 .procname = "memory_failure_recovery", 1622 .data = &sysctl_memory_failure_recovery, 1623 .maxlen = sizeof(sysctl_memory_failure_recovery), 1624 .mode = 0644, 1625 .proc_handler = proc_dointvec_minmax, 1626 .extra1 = &zero, 1627 .extra2 = &one, 1628 }, 1629 #endif 1630 { 1631 .procname = "user_reserve_kbytes", 1632 .data = &sysctl_user_reserve_kbytes, 1633 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1634 .mode = 0644, 1635 .proc_handler = proc_doulongvec_minmax, 1636 }, 1637 { 1638 .procname = "admin_reserve_kbytes", 1639 .data = &sysctl_admin_reserve_kbytes, 1640 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1641 .mode = 0644, 1642 .proc_handler = proc_doulongvec_minmax, 1643 }, 1644 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1645 { 1646 .procname = "mmap_rnd_bits", 1647 .data = &mmap_rnd_bits, 1648 .maxlen = sizeof(mmap_rnd_bits), 1649 .mode = 0600, 1650 .proc_handler = proc_dointvec_minmax, 1651 .extra1 = (void *)&mmap_rnd_bits_min, 1652 .extra2 = (void *)&mmap_rnd_bits_max, 1653 }, 1654 #endif 1655 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1656 { 1657 .procname = "mmap_rnd_compat_bits", 1658 .data = &mmap_rnd_compat_bits, 1659 .maxlen = sizeof(mmap_rnd_compat_bits), 1660 .mode = 0600, 1661 .proc_handler = proc_dointvec_minmax, 1662 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1663 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1664 }, 1665 #endif 1666 { } 1667 }; 1668 1669 static struct ctl_table fs_table[] = { 1670 { 1671 .procname = "inode-nr", 1672 .data = &inodes_stat, 1673 .maxlen = 2*sizeof(long), 1674 .mode = 0444, 1675 .proc_handler = proc_nr_inodes, 1676 }, 1677 { 1678 .procname = "inode-state", 1679 .data = &inodes_stat, 1680 .maxlen = 7*sizeof(long), 1681 .mode = 0444, 1682 .proc_handler = proc_nr_inodes, 1683 }, 1684 { 1685 .procname = "file-nr", 1686 .data = &files_stat, 1687 .maxlen = sizeof(files_stat), 1688 .mode = 0444, 1689 .proc_handler = proc_nr_files, 1690 }, 1691 { 1692 .procname = "file-max", 1693 .data = &files_stat.max_files, 1694 .maxlen = sizeof(files_stat.max_files), 1695 .mode = 0644, 1696 .proc_handler = proc_doulongvec_minmax, 1697 }, 1698 { 1699 .procname = "nr_open", 1700 .data = &sysctl_nr_open, 1701 .maxlen = sizeof(unsigned int), 1702 .mode = 0644, 1703 .proc_handler = proc_dointvec_minmax, 1704 .extra1 = &sysctl_nr_open_min, 1705 .extra2 = &sysctl_nr_open_max, 1706 }, 1707 { 1708 .procname = "dentry-state", 1709 .data = &dentry_stat, 1710 .maxlen = 6*sizeof(long), 1711 .mode = 0444, 1712 .proc_handler = proc_nr_dentry, 1713 }, 1714 { 1715 .procname = "overflowuid", 1716 .data = &fs_overflowuid, 1717 .maxlen = sizeof(int), 1718 .mode = 0644, 1719 .proc_handler = proc_dointvec_minmax, 1720 .extra1 = &minolduid, 1721 .extra2 = &maxolduid, 1722 }, 1723 { 1724 .procname = "overflowgid", 1725 .data = &fs_overflowgid, 1726 .maxlen = sizeof(int), 1727 .mode = 0644, 1728 .proc_handler = proc_dointvec_minmax, 1729 .extra1 = &minolduid, 1730 .extra2 = &maxolduid, 1731 }, 1732 #ifdef CONFIG_FILE_LOCKING 1733 { 1734 .procname = "leases-enable", 1735 .data = &leases_enable, 1736 .maxlen = sizeof(int), 1737 .mode = 0644, 1738 .proc_handler = proc_dointvec, 1739 }, 1740 #endif 1741 #ifdef CONFIG_DNOTIFY 1742 { 1743 .procname = "dir-notify-enable", 1744 .data = &dir_notify_enable, 1745 .maxlen = sizeof(int), 1746 .mode = 0644, 1747 .proc_handler = proc_dointvec, 1748 }, 1749 #endif 1750 #ifdef CONFIG_MMU 1751 #ifdef CONFIG_FILE_LOCKING 1752 { 1753 .procname = "lease-break-time", 1754 .data = &lease_break_time, 1755 .maxlen = sizeof(int), 1756 .mode = 0644, 1757 .proc_handler = proc_dointvec, 1758 }, 1759 #endif 1760 #ifdef CONFIG_AIO 1761 { 1762 .procname = "aio-nr", 1763 .data = &aio_nr, 1764 .maxlen = sizeof(aio_nr), 1765 .mode = 0444, 1766 .proc_handler = proc_doulongvec_minmax, 1767 }, 1768 { 1769 .procname = "aio-max-nr", 1770 .data = &aio_max_nr, 1771 .maxlen = sizeof(aio_max_nr), 1772 .mode = 0644, 1773 .proc_handler = proc_doulongvec_minmax, 1774 }, 1775 #endif /* CONFIG_AIO */ 1776 #ifdef CONFIG_INOTIFY_USER 1777 { 1778 .procname = "inotify", 1779 .mode = 0555, 1780 .child = inotify_table, 1781 }, 1782 #endif 1783 #ifdef CONFIG_EPOLL 1784 { 1785 .procname = "epoll", 1786 .mode = 0555, 1787 .child = epoll_table, 1788 }, 1789 #endif 1790 #endif 1791 { 1792 .procname = "protected_symlinks", 1793 .data = &sysctl_protected_symlinks, 1794 .maxlen = sizeof(int), 1795 .mode = 0600, 1796 .proc_handler = proc_dointvec_minmax, 1797 .extra1 = &zero, 1798 .extra2 = &one, 1799 }, 1800 { 1801 .procname = "protected_hardlinks", 1802 .data = &sysctl_protected_hardlinks, 1803 .maxlen = sizeof(int), 1804 .mode = 0600, 1805 .proc_handler = proc_dointvec_minmax, 1806 .extra1 = &zero, 1807 .extra2 = &one, 1808 }, 1809 { 1810 .procname = "suid_dumpable", 1811 .data = &suid_dumpable, 1812 .maxlen = sizeof(int), 1813 .mode = 0644, 1814 .proc_handler = proc_dointvec_minmax_coredump, 1815 .extra1 = &zero, 1816 .extra2 = &two, 1817 }, 1818 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1819 { 1820 .procname = "binfmt_misc", 1821 .mode = 0555, 1822 .child = sysctl_mount_point, 1823 }, 1824 #endif 1825 { 1826 .procname = "pipe-max-size", 1827 .data = &pipe_max_size, 1828 .maxlen = sizeof(int), 1829 .mode = 0644, 1830 .proc_handler = &pipe_proc_fn, 1831 .extra1 = &pipe_min_size, 1832 }, 1833 { 1834 .procname = "pipe-user-pages-hard", 1835 .data = &pipe_user_pages_hard, 1836 .maxlen = sizeof(pipe_user_pages_hard), 1837 .mode = 0644, 1838 .proc_handler = proc_doulongvec_minmax, 1839 }, 1840 { 1841 .procname = "pipe-user-pages-soft", 1842 .data = &pipe_user_pages_soft, 1843 .maxlen = sizeof(pipe_user_pages_soft), 1844 .mode = 0644, 1845 .proc_handler = proc_doulongvec_minmax, 1846 }, 1847 { 1848 .procname = "mount-max", 1849 .data = &sysctl_mount_max, 1850 .maxlen = sizeof(unsigned int), 1851 .mode = 0644, 1852 .proc_handler = proc_dointvec_minmax, 1853 .extra1 = &one, 1854 }, 1855 { } 1856 }; 1857 1858 static struct ctl_table debug_table[] = { 1859 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1860 { 1861 .procname = "exception-trace", 1862 .data = &show_unhandled_signals, 1863 .maxlen = sizeof(int), 1864 .mode = 0644, 1865 .proc_handler = proc_dointvec 1866 }, 1867 #endif 1868 #if defined(CONFIG_OPTPROBES) 1869 { 1870 .procname = "kprobes-optimization", 1871 .data = &sysctl_kprobes_optimization, 1872 .maxlen = sizeof(int), 1873 .mode = 0644, 1874 .proc_handler = proc_kprobes_optimization_handler, 1875 .extra1 = &zero, 1876 .extra2 = &one, 1877 }, 1878 #endif 1879 { } 1880 }; 1881 1882 static struct ctl_table dev_table[] = { 1883 { } 1884 }; 1885 1886 int __init sysctl_init(void) 1887 { 1888 struct ctl_table_header *hdr; 1889 1890 hdr = register_sysctl_table(sysctl_base_table); 1891 kmemleak_not_leak(hdr); 1892 return 0; 1893 } 1894 1895 #endif /* CONFIG_SYSCTL */ 1896 1897 /* 1898 * /proc/sys support 1899 */ 1900 1901 #ifdef CONFIG_PROC_SYSCTL 1902 1903 static int _proc_do_string(char *data, int maxlen, int write, 1904 char __user *buffer, 1905 size_t *lenp, loff_t *ppos) 1906 { 1907 size_t len; 1908 char __user *p; 1909 char c; 1910 1911 if (!data || !maxlen || !*lenp) { 1912 *lenp = 0; 1913 return 0; 1914 } 1915 1916 if (write) { 1917 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1918 /* Only continue writes not past the end of buffer. */ 1919 len = strlen(data); 1920 if (len > maxlen - 1) 1921 len = maxlen - 1; 1922 1923 if (*ppos > len) 1924 return 0; 1925 len = *ppos; 1926 } else { 1927 /* Start writing from beginning of buffer. */ 1928 len = 0; 1929 } 1930 1931 *ppos += *lenp; 1932 p = buffer; 1933 while ((p - buffer) < *lenp && len < maxlen - 1) { 1934 if (get_user(c, p++)) 1935 return -EFAULT; 1936 if (c == 0 || c == '\n') 1937 break; 1938 data[len++] = c; 1939 } 1940 data[len] = 0; 1941 } else { 1942 len = strlen(data); 1943 if (len > maxlen) 1944 len = maxlen; 1945 1946 if (*ppos > len) { 1947 *lenp = 0; 1948 return 0; 1949 } 1950 1951 data += *ppos; 1952 len -= *ppos; 1953 1954 if (len > *lenp) 1955 len = *lenp; 1956 if (len) 1957 if (copy_to_user(buffer, data, len)) 1958 return -EFAULT; 1959 if (len < *lenp) { 1960 if (put_user('\n', buffer + len)) 1961 return -EFAULT; 1962 len++; 1963 } 1964 *lenp = len; 1965 *ppos += len; 1966 } 1967 return 0; 1968 } 1969 1970 static void warn_sysctl_write(struct ctl_table *table) 1971 { 1972 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1973 "This will not be supported in the future. To silence this\n" 1974 "warning, set kernel.sysctl_writes_strict = -1\n", 1975 current->comm, table->procname); 1976 } 1977 1978 /** 1979 * proc_first_pos_non_zero_ignore - check if firs position is allowed 1980 * @ppos: file position 1981 * @table: the sysctl table 1982 * 1983 * Returns true if the first position is non-zero and the sysctl_writes_strict 1984 * mode indicates this is not allowed for numeric input types. String proc 1985 * hadlers can ignore the return value. 1986 */ 1987 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 1988 struct ctl_table *table) 1989 { 1990 if (!*ppos) 1991 return false; 1992 1993 switch (sysctl_writes_strict) { 1994 case SYSCTL_WRITES_STRICT: 1995 return true; 1996 case SYSCTL_WRITES_WARN: 1997 warn_sysctl_write(table); 1998 return false; 1999 default: 2000 return false; 2001 } 2002 } 2003 2004 /** 2005 * proc_dostring - read a string sysctl 2006 * @table: the sysctl table 2007 * @write: %TRUE if this is a write to the sysctl file 2008 * @buffer: the user buffer 2009 * @lenp: the size of the user buffer 2010 * @ppos: file position 2011 * 2012 * Reads/writes a string from/to the user buffer. If the kernel 2013 * buffer provided is not large enough to hold the string, the 2014 * string is truncated. The copied string is %NULL-terminated. 2015 * If the string is being read by the user process, it is copied 2016 * and a newline '\n' is added. It is truncated if the buffer is 2017 * not large enough. 2018 * 2019 * Returns 0 on success. 2020 */ 2021 int proc_dostring(struct ctl_table *table, int write, 2022 void __user *buffer, size_t *lenp, loff_t *ppos) 2023 { 2024 if (write) 2025 proc_first_pos_non_zero_ignore(ppos, table); 2026 2027 return _proc_do_string((char *)(table->data), table->maxlen, write, 2028 (char __user *)buffer, lenp, ppos); 2029 } 2030 2031 static size_t proc_skip_spaces(char **buf) 2032 { 2033 size_t ret; 2034 char *tmp = skip_spaces(*buf); 2035 ret = tmp - *buf; 2036 *buf = tmp; 2037 return ret; 2038 } 2039 2040 static void proc_skip_char(char **buf, size_t *size, const char v) 2041 { 2042 while (*size) { 2043 if (**buf != v) 2044 break; 2045 (*size)--; 2046 (*buf)++; 2047 } 2048 } 2049 2050 #define TMPBUFLEN 22 2051 /** 2052 * proc_get_long - reads an ASCII formatted integer from a user buffer 2053 * 2054 * @buf: a kernel buffer 2055 * @size: size of the kernel buffer 2056 * @val: this is where the number will be stored 2057 * @neg: set to %TRUE if number is negative 2058 * @perm_tr: a vector which contains the allowed trailers 2059 * @perm_tr_len: size of the perm_tr vector 2060 * @tr: pointer to store the trailer character 2061 * 2062 * In case of success %0 is returned and @buf and @size are updated with 2063 * the amount of bytes read. If @tr is non-NULL and a trailing 2064 * character exists (size is non-zero after returning from this 2065 * function), @tr is updated with the trailing character. 2066 */ 2067 static int proc_get_long(char **buf, size_t *size, 2068 unsigned long *val, bool *neg, 2069 const char *perm_tr, unsigned perm_tr_len, char *tr) 2070 { 2071 int len; 2072 char *p, tmp[TMPBUFLEN]; 2073 2074 if (!*size) 2075 return -EINVAL; 2076 2077 len = *size; 2078 if (len > TMPBUFLEN - 1) 2079 len = TMPBUFLEN - 1; 2080 2081 memcpy(tmp, *buf, len); 2082 2083 tmp[len] = 0; 2084 p = tmp; 2085 if (*p == '-' && *size > 1) { 2086 *neg = true; 2087 p++; 2088 } else 2089 *neg = false; 2090 if (!isdigit(*p)) 2091 return -EINVAL; 2092 2093 *val = simple_strtoul(p, &p, 0); 2094 2095 len = p - tmp; 2096 2097 /* We don't know if the next char is whitespace thus we may accept 2098 * invalid integers (e.g. 1234...a) or two integers instead of one 2099 * (e.g. 123...1). So lets not allow such large numbers. */ 2100 if (len == TMPBUFLEN - 1) 2101 return -EINVAL; 2102 2103 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2104 return -EINVAL; 2105 2106 if (tr && (len < *size)) 2107 *tr = *p; 2108 2109 *buf += len; 2110 *size -= len; 2111 2112 return 0; 2113 } 2114 2115 /** 2116 * proc_put_long - converts an integer to a decimal ASCII formatted string 2117 * 2118 * @buf: the user buffer 2119 * @size: the size of the user buffer 2120 * @val: the integer to be converted 2121 * @neg: sign of the number, %TRUE for negative 2122 * 2123 * In case of success %0 is returned and @buf and @size are updated with 2124 * the amount of bytes written. 2125 */ 2126 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2127 bool neg) 2128 { 2129 int len; 2130 char tmp[TMPBUFLEN], *p = tmp; 2131 2132 sprintf(p, "%s%lu", neg ? "-" : "", val); 2133 len = strlen(tmp); 2134 if (len > *size) 2135 len = *size; 2136 if (copy_to_user(*buf, tmp, len)) 2137 return -EFAULT; 2138 *size -= len; 2139 *buf += len; 2140 return 0; 2141 } 2142 #undef TMPBUFLEN 2143 2144 static int proc_put_char(void __user **buf, size_t *size, char c) 2145 { 2146 if (*size) { 2147 char __user **buffer = (char __user **)buf; 2148 if (put_user(c, *buffer)) 2149 return -EFAULT; 2150 (*size)--, (*buffer)++; 2151 *buf = *buffer; 2152 } 2153 return 0; 2154 } 2155 2156 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2157 int *valp, 2158 int write, void *data) 2159 { 2160 if (write) { 2161 if (*negp) { 2162 if (*lvalp > (unsigned long) INT_MAX + 1) 2163 return -EINVAL; 2164 *valp = -*lvalp; 2165 } else { 2166 if (*lvalp > (unsigned long) INT_MAX) 2167 return -EINVAL; 2168 *valp = *lvalp; 2169 } 2170 } else { 2171 int val = *valp; 2172 if (val < 0) { 2173 *negp = true; 2174 *lvalp = -(unsigned long)val; 2175 } else { 2176 *negp = false; 2177 *lvalp = (unsigned long)val; 2178 } 2179 } 2180 return 0; 2181 } 2182 2183 static int do_proc_douintvec_conv(unsigned long *lvalp, 2184 unsigned int *valp, 2185 int write, void *data) 2186 { 2187 if (write) { 2188 if (*lvalp > UINT_MAX) 2189 return -EINVAL; 2190 if (*lvalp > UINT_MAX) 2191 return -EINVAL; 2192 *valp = *lvalp; 2193 } else { 2194 unsigned int val = *valp; 2195 *lvalp = (unsigned long)val; 2196 } 2197 return 0; 2198 } 2199 2200 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2201 2202 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2203 int write, void __user *buffer, 2204 size_t *lenp, loff_t *ppos, 2205 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2206 int write, void *data), 2207 void *data) 2208 { 2209 int *i, vleft, first = 1, err = 0; 2210 size_t left; 2211 char *kbuf = NULL, *p; 2212 2213 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2214 *lenp = 0; 2215 return 0; 2216 } 2217 2218 i = (int *) tbl_data; 2219 vleft = table->maxlen / sizeof(*i); 2220 left = *lenp; 2221 2222 if (!conv) 2223 conv = do_proc_dointvec_conv; 2224 2225 if (write) { 2226 if (proc_first_pos_non_zero_ignore(ppos, table)) 2227 goto out; 2228 2229 if (left > PAGE_SIZE - 1) 2230 left = PAGE_SIZE - 1; 2231 p = kbuf = memdup_user_nul(buffer, left); 2232 if (IS_ERR(kbuf)) 2233 return PTR_ERR(kbuf); 2234 } 2235 2236 for (; left && vleft--; i++, first=0) { 2237 unsigned long lval; 2238 bool neg; 2239 2240 if (write) { 2241 left -= proc_skip_spaces(&p); 2242 2243 if (!left) 2244 break; 2245 err = proc_get_long(&p, &left, &lval, &neg, 2246 proc_wspace_sep, 2247 sizeof(proc_wspace_sep), NULL); 2248 if (err) 2249 break; 2250 if (conv(&neg, &lval, i, 1, data)) { 2251 err = -EINVAL; 2252 break; 2253 } 2254 } else { 2255 if (conv(&neg, &lval, i, 0, data)) { 2256 err = -EINVAL; 2257 break; 2258 } 2259 if (!first) 2260 err = proc_put_char(&buffer, &left, '\t'); 2261 if (err) 2262 break; 2263 err = proc_put_long(&buffer, &left, lval, neg); 2264 if (err) 2265 break; 2266 } 2267 } 2268 2269 if (!write && !first && left && !err) 2270 err = proc_put_char(&buffer, &left, '\n'); 2271 if (write && !err && left) 2272 left -= proc_skip_spaces(&p); 2273 if (write) { 2274 kfree(kbuf); 2275 if (first) 2276 return err ? : -EINVAL; 2277 } 2278 *lenp -= left; 2279 out: 2280 *ppos += *lenp; 2281 return err; 2282 } 2283 2284 static int do_proc_dointvec(struct ctl_table *table, int write, 2285 void __user *buffer, size_t *lenp, loff_t *ppos, 2286 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2287 int write, void *data), 2288 void *data) 2289 { 2290 return __do_proc_dointvec(table->data, table, write, 2291 buffer, lenp, ppos, conv, data); 2292 } 2293 2294 static int do_proc_douintvec_w(unsigned int *tbl_data, 2295 struct ctl_table *table, 2296 void __user *buffer, 2297 size_t *lenp, loff_t *ppos, 2298 int (*conv)(unsigned long *lvalp, 2299 unsigned int *valp, 2300 int write, void *data), 2301 void *data) 2302 { 2303 unsigned long lval; 2304 int err = 0; 2305 size_t left; 2306 bool neg; 2307 char *kbuf = NULL, *p; 2308 2309 left = *lenp; 2310 2311 if (proc_first_pos_non_zero_ignore(ppos, table)) 2312 goto bail_early; 2313 2314 if (left > PAGE_SIZE - 1) 2315 left = PAGE_SIZE - 1; 2316 2317 p = kbuf = memdup_user_nul(buffer, left); 2318 if (IS_ERR(kbuf)) 2319 return -EINVAL; 2320 2321 left -= proc_skip_spaces(&p); 2322 if (!left) { 2323 err = -EINVAL; 2324 goto out_free; 2325 } 2326 2327 err = proc_get_long(&p, &left, &lval, &neg, 2328 proc_wspace_sep, 2329 sizeof(proc_wspace_sep), NULL); 2330 if (err || neg) { 2331 err = -EINVAL; 2332 goto out_free; 2333 } 2334 2335 if (conv(&lval, tbl_data, 1, data)) { 2336 err = -EINVAL; 2337 goto out_free; 2338 } 2339 2340 if (!err && left) 2341 left -= proc_skip_spaces(&p); 2342 2343 out_free: 2344 kfree(kbuf); 2345 if (err) 2346 return -EINVAL; 2347 2348 return 0; 2349 2350 /* This is in keeping with old __do_proc_dointvec() */ 2351 bail_early: 2352 *ppos += *lenp; 2353 return err; 2354 } 2355 2356 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2357 size_t *lenp, loff_t *ppos, 2358 int (*conv)(unsigned long *lvalp, 2359 unsigned int *valp, 2360 int write, void *data), 2361 void *data) 2362 { 2363 unsigned long lval; 2364 int err = 0; 2365 size_t left; 2366 2367 left = *lenp; 2368 2369 if (conv(&lval, tbl_data, 0, data)) { 2370 err = -EINVAL; 2371 goto out; 2372 } 2373 2374 err = proc_put_long(&buffer, &left, lval, false); 2375 if (err || !left) 2376 goto out; 2377 2378 err = proc_put_char(&buffer, &left, '\n'); 2379 2380 out: 2381 *lenp -= left; 2382 *ppos += *lenp; 2383 2384 return err; 2385 } 2386 2387 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2388 int write, void __user *buffer, 2389 size_t *lenp, loff_t *ppos, 2390 int (*conv)(unsigned long *lvalp, 2391 unsigned int *valp, 2392 int write, void *data), 2393 void *data) 2394 { 2395 unsigned int *i, vleft; 2396 2397 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2398 *lenp = 0; 2399 return 0; 2400 } 2401 2402 i = (unsigned int *) tbl_data; 2403 vleft = table->maxlen / sizeof(*i); 2404 2405 /* 2406 * Arrays are not supported, keep this simple. *Do not* add 2407 * support for them. 2408 */ 2409 if (vleft != 1) { 2410 *lenp = 0; 2411 return -EINVAL; 2412 } 2413 2414 if (!conv) 2415 conv = do_proc_douintvec_conv; 2416 2417 if (write) 2418 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2419 conv, data); 2420 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2421 } 2422 2423 static int do_proc_douintvec(struct ctl_table *table, int write, 2424 void __user *buffer, size_t *lenp, loff_t *ppos, 2425 int (*conv)(unsigned long *lvalp, 2426 unsigned int *valp, 2427 int write, void *data), 2428 void *data) 2429 { 2430 return __do_proc_douintvec(table->data, table, write, 2431 buffer, lenp, ppos, conv, data); 2432 } 2433 2434 /** 2435 * proc_dointvec - read a vector of integers 2436 * @table: the sysctl table 2437 * @write: %TRUE if this is a write to the sysctl file 2438 * @buffer: the user buffer 2439 * @lenp: the size of the user buffer 2440 * @ppos: file position 2441 * 2442 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2443 * values from/to the user buffer, treated as an ASCII string. 2444 * 2445 * Returns 0 on success. 2446 */ 2447 int proc_dointvec(struct ctl_table *table, int write, 2448 void __user *buffer, size_t *lenp, loff_t *ppos) 2449 { 2450 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2451 } 2452 2453 /** 2454 * proc_douintvec - read a vector of unsigned integers 2455 * @table: the sysctl table 2456 * @write: %TRUE if this is a write to the sysctl file 2457 * @buffer: the user buffer 2458 * @lenp: the size of the user buffer 2459 * @ppos: file position 2460 * 2461 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2462 * values from/to the user buffer, treated as an ASCII string. 2463 * 2464 * Returns 0 on success. 2465 */ 2466 int proc_douintvec(struct ctl_table *table, int write, 2467 void __user *buffer, size_t *lenp, loff_t *ppos) 2468 { 2469 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2470 do_proc_douintvec_conv, NULL); 2471 } 2472 2473 /* 2474 * Taint values can only be increased 2475 * This means we can safely use a temporary. 2476 */ 2477 static int proc_taint(struct ctl_table *table, int write, 2478 void __user *buffer, size_t *lenp, loff_t *ppos) 2479 { 2480 struct ctl_table t; 2481 unsigned long tmptaint = get_taint(); 2482 int err; 2483 2484 if (write && !capable(CAP_SYS_ADMIN)) 2485 return -EPERM; 2486 2487 t = *table; 2488 t.data = &tmptaint; 2489 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2490 if (err < 0) 2491 return err; 2492 2493 if (write) { 2494 /* 2495 * Poor man's atomic or. Not worth adding a primitive 2496 * to everyone's atomic.h for this 2497 */ 2498 int i; 2499 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2500 if ((tmptaint >> i) & 1) 2501 add_taint(i, LOCKDEP_STILL_OK); 2502 } 2503 } 2504 2505 return err; 2506 } 2507 2508 #ifdef CONFIG_PRINTK 2509 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2510 void __user *buffer, size_t *lenp, loff_t *ppos) 2511 { 2512 if (write && !capable(CAP_SYS_ADMIN)) 2513 return -EPERM; 2514 2515 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2516 } 2517 #endif 2518 2519 struct do_proc_dointvec_minmax_conv_param { 2520 int *min; 2521 int *max; 2522 }; 2523 2524 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2525 int *valp, 2526 int write, void *data) 2527 { 2528 struct do_proc_dointvec_minmax_conv_param *param = data; 2529 if (write) { 2530 int val = *negp ? -*lvalp : *lvalp; 2531 if ((param->min && *param->min > val) || 2532 (param->max && *param->max < val)) 2533 return -EINVAL; 2534 *valp = val; 2535 } else { 2536 int val = *valp; 2537 if (val < 0) { 2538 *negp = true; 2539 *lvalp = -(unsigned long)val; 2540 } else { 2541 *negp = false; 2542 *lvalp = (unsigned long)val; 2543 } 2544 } 2545 return 0; 2546 } 2547 2548 /** 2549 * proc_dointvec_minmax - read a vector of integers with min/max values 2550 * @table: the sysctl table 2551 * @write: %TRUE if this is a write to the sysctl file 2552 * @buffer: the user buffer 2553 * @lenp: the size of the user buffer 2554 * @ppos: file position 2555 * 2556 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2557 * values from/to the user buffer, treated as an ASCII string. 2558 * 2559 * This routine will ensure the values are within the range specified by 2560 * table->extra1 (min) and table->extra2 (max). 2561 * 2562 * Returns 0 on success. 2563 */ 2564 int proc_dointvec_minmax(struct ctl_table *table, int write, 2565 void __user *buffer, size_t *lenp, loff_t *ppos) 2566 { 2567 struct do_proc_dointvec_minmax_conv_param param = { 2568 .min = (int *) table->extra1, 2569 .max = (int *) table->extra2, 2570 }; 2571 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2572 do_proc_dointvec_minmax_conv, ¶m); 2573 } 2574 2575 struct do_proc_douintvec_minmax_conv_param { 2576 unsigned int *min; 2577 unsigned int *max; 2578 }; 2579 2580 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2581 unsigned int *valp, 2582 int write, void *data) 2583 { 2584 struct do_proc_douintvec_minmax_conv_param *param = data; 2585 2586 if (write) { 2587 unsigned int val = *lvalp; 2588 2589 if ((param->min && *param->min > val) || 2590 (param->max && *param->max < val)) 2591 return -ERANGE; 2592 2593 if (*lvalp > UINT_MAX) 2594 return -EINVAL; 2595 *valp = val; 2596 } else { 2597 unsigned int val = *valp; 2598 *lvalp = (unsigned long) val; 2599 } 2600 2601 return 0; 2602 } 2603 2604 /** 2605 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2606 * @table: the sysctl table 2607 * @write: %TRUE if this is a write to the sysctl file 2608 * @buffer: the user buffer 2609 * @lenp: the size of the user buffer 2610 * @ppos: file position 2611 * 2612 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2613 * values from/to the user buffer, treated as an ASCII string. Negative 2614 * strings are not allowed. 2615 * 2616 * This routine will ensure the values are within the range specified by 2617 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2618 * check for UINT_MAX to avoid having to support wrap around uses from 2619 * userspace. 2620 * 2621 * Returns 0 on success. 2622 */ 2623 int proc_douintvec_minmax(struct ctl_table *table, int write, 2624 void __user *buffer, size_t *lenp, loff_t *ppos) 2625 { 2626 struct do_proc_douintvec_minmax_conv_param param = { 2627 .min = (unsigned int *) table->extra1, 2628 .max = (unsigned int *) table->extra2, 2629 }; 2630 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2631 do_proc_douintvec_minmax_conv, ¶m); 2632 } 2633 2634 static void validate_coredump_safety(void) 2635 { 2636 #ifdef CONFIG_COREDUMP 2637 if (suid_dumpable == SUID_DUMP_ROOT && 2638 core_pattern[0] != '/' && core_pattern[0] != '|') { 2639 printk(KERN_WARNING 2640 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2641 "Pipe handler or fully qualified core dump path required.\n" 2642 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2643 ); 2644 } 2645 #endif 2646 } 2647 2648 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2649 void __user *buffer, size_t *lenp, loff_t *ppos) 2650 { 2651 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2652 if (!error) 2653 validate_coredump_safety(); 2654 return error; 2655 } 2656 2657 #ifdef CONFIG_COREDUMP 2658 static int proc_dostring_coredump(struct ctl_table *table, int write, 2659 void __user *buffer, size_t *lenp, loff_t *ppos) 2660 { 2661 int error = proc_dostring(table, write, buffer, lenp, ppos); 2662 if (!error) 2663 validate_coredump_safety(); 2664 return error; 2665 } 2666 #endif 2667 2668 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2669 void __user *buffer, 2670 size_t *lenp, loff_t *ppos, 2671 unsigned long convmul, 2672 unsigned long convdiv) 2673 { 2674 unsigned long *i, *min, *max; 2675 int vleft, first = 1, err = 0; 2676 size_t left; 2677 char *kbuf = NULL, *p; 2678 2679 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2680 *lenp = 0; 2681 return 0; 2682 } 2683 2684 i = (unsigned long *) data; 2685 min = (unsigned long *) table->extra1; 2686 max = (unsigned long *) table->extra2; 2687 vleft = table->maxlen / sizeof(unsigned long); 2688 left = *lenp; 2689 2690 if (write) { 2691 if (proc_first_pos_non_zero_ignore(ppos, table)) 2692 goto out; 2693 2694 if (left > PAGE_SIZE - 1) 2695 left = PAGE_SIZE - 1; 2696 p = kbuf = memdup_user_nul(buffer, left); 2697 if (IS_ERR(kbuf)) 2698 return PTR_ERR(kbuf); 2699 } 2700 2701 for (; left && vleft--; i++, first = 0) { 2702 unsigned long val; 2703 2704 if (write) { 2705 bool neg; 2706 2707 left -= proc_skip_spaces(&p); 2708 2709 err = proc_get_long(&p, &left, &val, &neg, 2710 proc_wspace_sep, 2711 sizeof(proc_wspace_sep), NULL); 2712 if (err) 2713 break; 2714 if (neg) 2715 continue; 2716 val = convmul * val / convdiv; 2717 if ((min && val < *min) || (max && val > *max)) 2718 continue; 2719 *i = val; 2720 } else { 2721 val = convdiv * (*i) / convmul; 2722 if (!first) { 2723 err = proc_put_char(&buffer, &left, '\t'); 2724 if (err) 2725 break; 2726 } 2727 err = proc_put_long(&buffer, &left, val, false); 2728 if (err) 2729 break; 2730 } 2731 } 2732 2733 if (!write && !first && left && !err) 2734 err = proc_put_char(&buffer, &left, '\n'); 2735 if (write && !err) 2736 left -= proc_skip_spaces(&p); 2737 if (write) { 2738 kfree(kbuf); 2739 if (first) 2740 return err ? : -EINVAL; 2741 } 2742 *lenp -= left; 2743 out: 2744 *ppos += *lenp; 2745 return err; 2746 } 2747 2748 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2749 void __user *buffer, 2750 size_t *lenp, loff_t *ppos, 2751 unsigned long convmul, 2752 unsigned long convdiv) 2753 { 2754 return __do_proc_doulongvec_minmax(table->data, table, write, 2755 buffer, lenp, ppos, convmul, convdiv); 2756 } 2757 2758 /** 2759 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2760 * @table: the sysctl table 2761 * @write: %TRUE if this is a write to the sysctl file 2762 * @buffer: the user buffer 2763 * @lenp: the size of the user buffer 2764 * @ppos: file position 2765 * 2766 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2767 * values from/to the user buffer, treated as an ASCII string. 2768 * 2769 * This routine will ensure the values are within the range specified by 2770 * table->extra1 (min) and table->extra2 (max). 2771 * 2772 * Returns 0 on success. 2773 */ 2774 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2775 void __user *buffer, size_t *lenp, loff_t *ppos) 2776 { 2777 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2778 } 2779 2780 /** 2781 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2782 * @table: the sysctl table 2783 * @write: %TRUE if this is a write to the sysctl file 2784 * @buffer: the user buffer 2785 * @lenp: the size of the user buffer 2786 * @ppos: file position 2787 * 2788 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2789 * values from/to the user buffer, treated as an ASCII string. The values 2790 * are treated as milliseconds, and converted to jiffies when they are stored. 2791 * 2792 * This routine will ensure the values are within the range specified by 2793 * table->extra1 (min) and table->extra2 (max). 2794 * 2795 * Returns 0 on success. 2796 */ 2797 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2798 void __user *buffer, 2799 size_t *lenp, loff_t *ppos) 2800 { 2801 return do_proc_doulongvec_minmax(table, write, buffer, 2802 lenp, ppos, HZ, 1000l); 2803 } 2804 2805 2806 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2807 int *valp, 2808 int write, void *data) 2809 { 2810 if (write) { 2811 if (*lvalp > INT_MAX / HZ) 2812 return 1; 2813 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2814 } else { 2815 int val = *valp; 2816 unsigned long lval; 2817 if (val < 0) { 2818 *negp = true; 2819 lval = -(unsigned long)val; 2820 } else { 2821 *negp = false; 2822 lval = (unsigned long)val; 2823 } 2824 *lvalp = lval / HZ; 2825 } 2826 return 0; 2827 } 2828 2829 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2830 int *valp, 2831 int write, void *data) 2832 { 2833 if (write) { 2834 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2835 return 1; 2836 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2837 } else { 2838 int val = *valp; 2839 unsigned long lval; 2840 if (val < 0) { 2841 *negp = true; 2842 lval = -(unsigned long)val; 2843 } else { 2844 *negp = false; 2845 lval = (unsigned long)val; 2846 } 2847 *lvalp = jiffies_to_clock_t(lval); 2848 } 2849 return 0; 2850 } 2851 2852 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2853 int *valp, 2854 int write, void *data) 2855 { 2856 if (write) { 2857 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2858 2859 if (jif > INT_MAX) 2860 return 1; 2861 *valp = (int)jif; 2862 } else { 2863 int val = *valp; 2864 unsigned long lval; 2865 if (val < 0) { 2866 *negp = true; 2867 lval = -(unsigned long)val; 2868 } else { 2869 *negp = false; 2870 lval = (unsigned long)val; 2871 } 2872 *lvalp = jiffies_to_msecs(lval); 2873 } 2874 return 0; 2875 } 2876 2877 /** 2878 * proc_dointvec_jiffies - read a vector of integers as seconds 2879 * @table: the sysctl table 2880 * @write: %TRUE if this is a write to the sysctl file 2881 * @buffer: the user buffer 2882 * @lenp: the size of the user buffer 2883 * @ppos: file position 2884 * 2885 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2886 * values from/to the user buffer, treated as an ASCII string. 2887 * The values read are assumed to be in seconds, and are converted into 2888 * jiffies. 2889 * 2890 * Returns 0 on success. 2891 */ 2892 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2893 void __user *buffer, size_t *lenp, loff_t *ppos) 2894 { 2895 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2896 do_proc_dointvec_jiffies_conv,NULL); 2897 } 2898 2899 /** 2900 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2901 * @table: the sysctl table 2902 * @write: %TRUE if this is a write to the sysctl file 2903 * @buffer: the user buffer 2904 * @lenp: the size of the user buffer 2905 * @ppos: pointer to the file position 2906 * 2907 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2908 * values from/to the user buffer, treated as an ASCII string. 2909 * The values read are assumed to be in 1/USER_HZ seconds, and 2910 * are converted into jiffies. 2911 * 2912 * Returns 0 on success. 2913 */ 2914 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2915 void __user *buffer, size_t *lenp, loff_t *ppos) 2916 { 2917 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2918 do_proc_dointvec_userhz_jiffies_conv,NULL); 2919 } 2920 2921 /** 2922 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2923 * @table: the sysctl table 2924 * @write: %TRUE if this is a write to the sysctl file 2925 * @buffer: the user buffer 2926 * @lenp: the size of the user buffer 2927 * @ppos: file position 2928 * @ppos: the current position in the file 2929 * 2930 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2931 * values from/to the user buffer, treated as an ASCII string. 2932 * The values read are assumed to be in 1/1000 seconds, and 2933 * are converted into jiffies. 2934 * 2935 * Returns 0 on success. 2936 */ 2937 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2938 void __user *buffer, size_t *lenp, loff_t *ppos) 2939 { 2940 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2941 do_proc_dointvec_ms_jiffies_conv, NULL); 2942 } 2943 2944 static int proc_do_cad_pid(struct ctl_table *table, int write, 2945 void __user *buffer, size_t *lenp, loff_t *ppos) 2946 { 2947 struct pid *new_pid; 2948 pid_t tmp; 2949 int r; 2950 2951 tmp = pid_vnr(cad_pid); 2952 2953 r = __do_proc_dointvec(&tmp, table, write, buffer, 2954 lenp, ppos, NULL, NULL); 2955 if (r || !write) 2956 return r; 2957 2958 new_pid = find_get_pid(tmp); 2959 if (!new_pid) 2960 return -ESRCH; 2961 2962 put_pid(xchg(&cad_pid, new_pid)); 2963 return 0; 2964 } 2965 2966 /** 2967 * proc_do_large_bitmap - read/write from/to a large bitmap 2968 * @table: the sysctl table 2969 * @write: %TRUE if this is a write to the sysctl file 2970 * @buffer: the user buffer 2971 * @lenp: the size of the user buffer 2972 * @ppos: file position 2973 * 2974 * The bitmap is stored at table->data and the bitmap length (in bits) 2975 * in table->maxlen. 2976 * 2977 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2978 * large bitmaps may be represented in a compact manner. Writing into 2979 * the file will clear the bitmap then update it with the given input. 2980 * 2981 * Returns 0 on success. 2982 */ 2983 int proc_do_large_bitmap(struct ctl_table *table, int write, 2984 void __user *buffer, size_t *lenp, loff_t *ppos) 2985 { 2986 int err = 0; 2987 bool first = 1; 2988 size_t left = *lenp; 2989 unsigned long bitmap_len = table->maxlen; 2990 unsigned long *bitmap = *(unsigned long **) table->data; 2991 unsigned long *tmp_bitmap = NULL; 2992 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2993 2994 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2995 *lenp = 0; 2996 return 0; 2997 } 2998 2999 if (write) { 3000 char *kbuf, *p; 3001 3002 if (left > PAGE_SIZE - 1) 3003 left = PAGE_SIZE - 1; 3004 3005 p = kbuf = memdup_user_nul(buffer, left); 3006 if (IS_ERR(kbuf)) 3007 return PTR_ERR(kbuf); 3008 3009 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 3010 GFP_KERNEL); 3011 if (!tmp_bitmap) { 3012 kfree(kbuf); 3013 return -ENOMEM; 3014 } 3015 proc_skip_char(&p, &left, '\n'); 3016 while (!err && left) { 3017 unsigned long val_a, val_b; 3018 bool neg; 3019 3020 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3021 sizeof(tr_a), &c); 3022 if (err) 3023 break; 3024 if (val_a >= bitmap_len || neg) { 3025 err = -EINVAL; 3026 break; 3027 } 3028 3029 val_b = val_a; 3030 if (left) { 3031 p++; 3032 left--; 3033 } 3034 3035 if (c == '-') { 3036 err = proc_get_long(&p, &left, &val_b, 3037 &neg, tr_b, sizeof(tr_b), 3038 &c); 3039 if (err) 3040 break; 3041 if (val_b >= bitmap_len || neg || 3042 val_a > val_b) { 3043 err = -EINVAL; 3044 break; 3045 } 3046 if (left) { 3047 p++; 3048 left--; 3049 } 3050 } 3051 3052 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3053 first = 0; 3054 proc_skip_char(&p, &left, '\n'); 3055 } 3056 kfree(kbuf); 3057 } else { 3058 unsigned long bit_a, bit_b = 0; 3059 3060 while (left) { 3061 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3062 if (bit_a >= bitmap_len) 3063 break; 3064 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3065 bit_a + 1) - 1; 3066 3067 if (!first) { 3068 err = proc_put_char(&buffer, &left, ','); 3069 if (err) 3070 break; 3071 } 3072 err = proc_put_long(&buffer, &left, bit_a, false); 3073 if (err) 3074 break; 3075 if (bit_a != bit_b) { 3076 err = proc_put_char(&buffer, &left, '-'); 3077 if (err) 3078 break; 3079 err = proc_put_long(&buffer, &left, bit_b, false); 3080 if (err) 3081 break; 3082 } 3083 3084 first = 0; bit_b++; 3085 } 3086 if (!err) 3087 err = proc_put_char(&buffer, &left, '\n'); 3088 } 3089 3090 if (!err) { 3091 if (write) { 3092 if (*ppos) 3093 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3094 else 3095 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3096 } 3097 kfree(tmp_bitmap); 3098 *lenp -= left; 3099 *ppos += *lenp; 3100 return 0; 3101 } else { 3102 kfree(tmp_bitmap); 3103 return err; 3104 } 3105 } 3106 3107 #else /* CONFIG_PROC_SYSCTL */ 3108 3109 int proc_dostring(struct ctl_table *table, int write, 3110 void __user *buffer, size_t *lenp, loff_t *ppos) 3111 { 3112 return -ENOSYS; 3113 } 3114 3115 int proc_dointvec(struct ctl_table *table, int write, 3116 void __user *buffer, size_t *lenp, loff_t *ppos) 3117 { 3118 return -ENOSYS; 3119 } 3120 3121 int proc_douintvec(struct ctl_table *table, int write, 3122 void __user *buffer, size_t *lenp, loff_t *ppos) 3123 { 3124 return -ENOSYS; 3125 } 3126 3127 int proc_dointvec_minmax(struct ctl_table *table, int write, 3128 void __user *buffer, size_t *lenp, loff_t *ppos) 3129 { 3130 return -ENOSYS; 3131 } 3132 3133 int proc_douintvec_minmax(struct ctl_table *table, int write, 3134 void __user *buffer, size_t *lenp, loff_t *ppos) 3135 { 3136 return -ENOSYS; 3137 } 3138 3139 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3140 void __user *buffer, size_t *lenp, loff_t *ppos) 3141 { 3142 return -ENOSYS; 3143 } 3144 3145 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3146 void __user *buffer, size_t *lenp, loff_t *ppos) 3147 { 3148 return -ENOSYS; 3149 } 3150 3151 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3152 void __user *buffer, size_t *lenp, loff_t *ppos) 3153 { 3154 return -ENOSYS; 3155 } 3156 3157 int proc_doulongvec_minmax(struct ctl_table *table, int write, 3158 void __user *buffer, size_t *lenp, loff_t *ppos) 3159 { 3160 return -ENOSYS; 3161 } 3162 3163 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 3164 void __user *buffer, 3165 size_t *lenp, loff_t *ppos) 3166 { 3167 return -ENOSYS; 3168 } 3169 3170 3171 #endif /* CONFIG_PROC_SYSCTL */ 3172 3173 /* 3174 * No sense putting this after each symbol definition, twice, 3175 * exception granted :-) 3176 */ 3177 EXPORT_SYMBOL(proc_dointvec); 3178 EXPORT_SYMBOL(proc_douintvec); 3179 EXPORT_SYMBOL(proc_dointvec_jiffies); 3180 EXPORT_SYMBOL(proc_dointvec_minmax); 3181 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3182 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3183 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3184 EXPORT_SYMBOL(proc_dostring); 3185 EXPORT_SYMBOL(proc_doulongvec_minmax); 3186 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3187