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/kmemleak.h> 34 #include <linux/fs.h> 35 #include <linux/init.h> 36 #include <linux/kernel.h> 37 #include <linux/kobject.h> 38 #include <linux/net.h> 39 #include <linux/sysrq.h> 40 #include <linux/highuid.h> 41 #include <linux/writeback.h> 42 #include <linux/ratelimit.h> 43 #include <linux/compaction.h> 44 #include <linux/hugetlb.h> 45 #include <linux/initrd.h> 46 #include <linux/key.h> 47 #include <linux/times.h> 48 #include <linux/limits.h> 49 #include <linux/dcache.h> 50 #include <linux/dnotify.h> 51 #include <linux/syscalls.h> 52 #include <linux/vmstat.h> 53 #include <linux/nfs_fs.h> 54 #include <linux/acpi.h> 55 #include <linux/reboot.h> 56 #include <linux/ftrace.h> 57 #include <linux/perf_event.h> 58 #include <linux/kprobes.h> 59 #include <linux/pipe_fs_i.h> 60 #include <linux/oom.h> 61 #include <linux/kmod.h> 62 #include <linux/capability.h> 63 #include <linux/binfmts.h> 64 #include <linux/sched/sysctl.h> 65 #include <linux/sched/coredump.h> 66 #include <linux/kexec.h> 67 #include <linux/bpf.h> 68 #include <linux/mount.h> 69 70 #include <linux/uaccess.h> 71 #include <asm/processor.h> 72 73 #ifdef CONFIG_X86 74 #include <asm/nmi.h> 75 #include <asm/stacktrace.h> 76 #include <asm/io.h> 77 #endif 78 #ifdef CONFIG_SPARC 79 #include <asm/setup.h> 80 #endif 81 #ifdef CONFIG_BSD_PROCESS_ACCT 82 #include <linux/acct.h> 83 #endif 84 #ifdef CONFIG_RT_MUTEXES 85 #include <linux/rtmutex.h> 86 #endif 87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT) 88 #include <linux/lockdep.h> 89 #endif 90 #ifdef CONFIG_CHR_DEV_SG 91 #include <scsi/sg.h> 92 #endif 93 94 #ifdef CONFIG_LOCKUP_DETECTOR 95 #include <linux/nmi.h> 96 #endif 97 98 #if defined(CONFIG_SYSCTL) 99 100 /* External variables not in a header file. */ 101 extern int suid_dumpable; 102 #ifdef CONFIG_COREDUMP 103 extern int core_uses_pid; 104 extern char core_pattern[]; 105 extern unsigned int core_pipe_limit; 106 #endif 107 extern int pid_max; 108 extern int pid_max_min, pid_max_max; 109 extern int percpu_pagelist_fraction; 110 extern int latencytop_enabled; 111 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max; 112 #ifndef CONFIG_MMU 113 extern int sysctl_nr_trim_pages; 114 #endif 115 116 /* Constants used for minimum and maximum */ 117 #ifdef CONFIG_LOCKUP_DETECTOR 118 static int sixty = 60; 119 #endif 120 121 static int __maybe_unused neg_one = -1; 122 123 static int zero; 124 static int __maybe_unused one = 1; 125 static int __maybe_unused two = 2; 126 static int __maybe_unused four = 4; 127 static unsigned long one_ul = 1; 128 static int one_hundred = 100; 129 static int one_thousand = 1000; 130 #ifdef CONFIG_PRINTK 131 static int ten_thousand = 10000; 132 #endif 133 #ifdef CONFIG_PERF_EVENTS 134 static int six_hundred_forty_kb = 640 * 1024; 135 #endif 136 137 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */ 138 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE; 139 140 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 141 static int maxolduid = 65535; 142 static int minolduid; 143 144 static int ngroups_max = NGROUPS_MAX; 145 static const int cap_last_cap = CAP_LAST_CAP; 146 147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */ 148 #ifdef CONFIG_DETECT_HUNG_TASK 149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ); 150 #endif 151 152 #ifdef CONFIG_INOTIFY_USER 153 #include <linux/inotify.h> 154 #endif 155 #ifdef CONFIG_SPARC 156 #endif 157 158 #ifdef __hppa__ 159 extern int pwrsw_enabled; 160 #endif 161 162 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 163 extern int unaligned_enabled; 164 #endif 165 166 #ifdef CONFIG_IA64 167 extern int unaligned_dump_stack; 168 #endif 169 170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 171 extern int no_unaligned_warning; 172 #endif 173 174 #ifdef CONFIG_PROC_SYSCTL 175 176 /** 177 * enum sysctl_writes_mode - supported sysctl write modes 178 * 179 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value 180 * to be written, and multiple writes on the same sysctl file descriptor 181 * will rewrite the sysctl value, regardless of file position. No warning 182 * is issued when the initial position is not 0. 183 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is 184 * not 0. 185 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at 186 * file position 0 and the value must be fully contained in the buffer 187 * sent to the write syscall. If dealing with strings respect the file 188 * position, but restrict this to the max length of the buffer, anything 189 * passed the max lenght will be ignored. Multiple writes will append 190 * to the buffer. 191 * 192 * These write modes control how current file position affects the behavior of 193 * updating sysctl values through the proc interface on each write. 194 */ 195 enum sysctl_writes_mode { 196 SYSCTL_WRITES_LEGACY = -1, 197 SYSCTL_WRITES_WARN = 0, 198 SYSCTL_WRITES_STRICT = 1, 199 }; 200 201 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT; 202 203 static int proc_do_cad_pid(struct ctl_table *table, int write, 204 void __user *buffer, size_t *lenp, loff_t *ppos); 205 static int proc_taint(struct ctl_table *table, int write, 206 void __user *buffer, size_t *lenp, loff_t *ppos); 207 #endif 208 209 #ifdef CONFIG_PRINTK 210 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 211 void __user *buffer, size_t *lenp, loff_t *ppos); 212 #endif 213 214 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 215 void __user *buffer, size_t *lenp, loff_t *ppos); 216 #ifdef CONFIG_COREDUMP 217 static int proc_dostring_coredump(struct ctl_table *table, int write, 218 void __user *buffer, size_t *lenp, loff_t *ppos); 219 #endif 220 221 #ifdef CONFIG_MAGIC_SYSRQ 222 /* Note: sysrq code uses it's own private copy */ 223 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE; 224 225 static int sysrq_sysctl_handler(struct ctl_table *table, int write, 226 void __user *buffer, size_t *lenp, 227 loff_t *ppos) 228 { 229 int error; 230 231 error = proc_dointvec(table, write, buffer, lenp, ppos); 232 if (error) 233 return error; 234 235 if (write) 236 sysrq_toggle_support(__sysrq_enabled); 237 238 return 0; 239 } 240 241 #endif 242 243 static struct ctl_table kern_table[]; 244 static struct ctl_table vm_table[]; 245 static struct ctl_table fs_table[]; 246 static struct ctl_table debug_table[]; 247 static struct ctl_table dev_table[]; 248 extern struct ctl_table random_table[]; 249 #ifdef CONFIG_EPOLL 250 extern struct ctl_table epoll_table[]; 251 #endif 252 253 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 254 int sysctl_legacy_va_layout; 255 #endif 256 257 /* The default sysctl tables: */ 258 259 static struct ctl_table sysctl_base_table[] = { 260 { 261 .procname = "kernel", 262 .mode = 0555, 263 .child = kern_table, 264 }, 265 { 266 .procname = "vm", 267 .mode = 0555, 268 .child = vm_table, 269 }, 270 { 271 .procname = "fs", 272 .mode = 0555, 273 .child = fs_table, 274 }, 275 { 276 .procname = "debug", 277 .mode = 0555, 278 .child = debug_table, 279 }, 280 { 281 .procname = "dev", 282 .mode = 0555, 283 .child = dev_table, 284 }, 285 { } 286 }; 287 288 #ifdef CONFIG_SCHED_DEBUG 289 static int min_sched_granularity_ns = 100000; /* 100 usecs */ 290 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */ 291 static int min_wakeup_granularity_ns; /* 0 usecs */ 292 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */ 293 #ifdef CONFIG_SMP 294 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE; 295 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1; 296 #endif /* CONFIG_SMP */ 297 #endif /* CONFIG_SCHED_DEBUG */ 298 299 #ifdef CONFIG_COMPACTION 300 static int min_extfrag_threshold; 301 static int max_extfrag_threshold = 1000; 302 #endif 303 304 static struct ctl_table kern_table[] = { 305 { 306 .procname = "sched_child_runs_first", 307 .data = &sysctl_sched_child_runs_first, 308 .maxlen = sizeof(unsigned int), 309 .mode = 0644, 310 .proc_handler = proc_dointvec, 311 }, 312 #ifdef CONFIG_SCHED_DEBUG 313 { 314 .procname = "sched_min_granularity_ns", 315 .data = &sysctl_sched_min_granularity, 316 .maxlen = sizeof(unsigned int), 317 .mode = 0644, 318 .proc_handler = sched_proc_update_handler, 319 .extra1 = &min_sched_granularity_ns, 320 .extra2 = &max_sched_granularity_ns, 321 }, 322 { 323 .procname = "sched_latency_ns", 324 .data = &sysctl_sched_latency, 325 .maxlen = sizeof(unsigned int), 326 .mode = 0644, 327 .proc_handler = sched_proc_update_handler, 328 .extra1 = &min_sched_granularity_ns, 329 .extra2 = &max_sched_granularity_ns, 330 }, 331 { 332 .procname = "sched_wakeup_granularity_ns", 333 .data = &sysctl_sched_wakeup_granularity, 334 .maxlen = sizeof(unsigned int), 335 .mode = 0644, 336 .proc_handler = sched_proc_update_handler, 337 .extra1 = &min_wakeup_granularity_ns, 338 .extra2 = &max_wakeup_granularity_ns, 339 }, 340 #ifdef CONFIG_SMP 341 { 342 .procname = "sched_tunable_scaling", 343 .data = &sysctl_sched_tunable_scaling, 344 .maxlen = sizeof(enum sched_tunable_scaling), 345 .mode = 0644, 346 .proc_handler = sched_proc_update_handler, 347 .extra1 = &min_sched_tunable_scaling, 348 .extra2 = &max_sched_tunable_scaling, 349 }, 350 { 351 .procname = "sched_migration_cost_ns", 352 .data = &sysctl_sched_migration_cost, 353 .maxlen = sizeof(unsigned int), 354 .mode = 0644, 355 .proc_handler = proc_dointvec, 356 }, 357 { 358 .procname = "sched_nr_migrate", 359 .data = &sysctl_sched_nr_migrate, 360 .maxlen = sizeof(unsigned int), 361 .mode = 0644, 362 .proc_handler = proc_dointvec, 363 }, 364 { 365 .procname = "sched_time_avg_ms", 366 .data = &sysctl_sched_time_avg, 367 .maxlen = sizeof(unsigned int), 368 .mode = 0644, 369 .proc_handler = proc_dointvec_minmax, 370 .extra1 = &one, 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_user_enabled, 893 .maxlen = sizeof(int), 894 .mode = NMI_WATCHDOG_SYSCTL_PERM, 895 .proc_handler = proc_nmi_watchdog, 896 .extra1 = &zero, 897 .extra2 = &one, 898 }, 899 { 900 .procname = "watchdog_cpumask", 901 .data = &watchdog_cpumask_bits, 902 .maxlen = NR_CPUS, 903 .mode = 0644, 904 .proc_handler = proc_watchdog_cpumask, 905 }, 906 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 907 { 908 .procname = "soft_watchdog", 909 .data = &soft_watchdog_user_enabled, 910 .maxlen = sizeof(int), 911 .mode = 0644, 912 .proc_handler = proc_soft_watchdog, 913 .extra1 = &zero, 914 .extra2 = &one, 915 }, 916 { 917 .procname = "softlockup_panic", 918 .data = &softlockup_panic, 919 .maxlen = sizeof(int), 920 .mode = 0644, 921 .proc_handler = proc_dointvec_minmax, 922 .extra1 = &zero, 923 .extra2 = &one, 924 }, 925 #ifdef CONFIG_SMP 926 { 927 .procname = "softlockup_all_cpu_backtrace", 928 .data = &sysctl_softlockup_all_cpu_backtrace, 929 .maxlen = sizeof(int), 930 .mode = 0644, 931 .proc_handler = proc_dointvec_minmax, 932 .extra1 = &zero, 933 .extra2 = &one, 934 }, 935 #endif /* CONFIG_SMP */ 936 #endif 937 #ifdef CONFIG_HARDLOCKUP_DETECTOR 938 { 939 .procname = "hardlockup_panic", 940 .data = &hardlockup_panic, 941 .maxlen = sizeof(int), 942 .mode = 0644, 943 .proc_handler = proc_dointvec_minmax, 944 .extra1 = &zero, 945 .extra2 = &one, 946 }, 947 #ifdef CONFIG_SMP 948 { 949 .procname = "hardlockup_all_cpu_backtrace", 950 .data = &sysctl_hardlockup_all_cpu_backtrace, 951 .maxlen = sizeof(int), 952 .mode = 0644, 953 .proc_handler = proc_dointvec_minmax, 954 .extra1 = &zero, 955 .extra2 = &one, 956 }, 957 #endif /* CONFIG_SMP */ 958 #endif 959 #endif 960 961 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 962 { 963 .procname = "unknown_nmi_panic", 964 .data = &unknown_nmi_panic, 965 .maxlen = sizeof (int), 966 .mode = 0644, 967 .proc_handler = proc_dointvec, 968 }, 969 #endif 970 #if defined(CONFIG_X86) 971 { 972 .procname = "panic_on_unrecovered_nmi", 973 .data = &panic_on_unrecovered_nmi, 974 .maxlen = sizeof(int), 975 .mode = 0644, 976 .proc_handler = proc_dointvec, 977 }, 978 { 979 .procname = "panic_on_io_nmi", 980 .data = &panic_on_io_nmi, 981 .maxlen = sizeof(int), 982 .mode = 0644, 983 .proc_handler = proc_dointvec, 984 }, 985 #ifdef CONFIG_DEBUG_STACKOVERFLOW 986 { 987 .procname = "panic_on_stackoverflow", 988 .data = &sysctl_panic_on_stackoverflow, 989 .maxlen = sizeof(int), 990 .mode = 0644, 991 .proc_handler = proc_dointvec, 992 }, 993 #endif 994 { 995 .procname = "bootloader_type", 996 .data = &bootloader_type, 997 .maxlen = sizeof (int), 998 .mode = 0444, 999 .proc_handler = proc_dointvec, 1000 }, 1001 { 1002 .procname = "bootloader_version", 1003 .data = &bootloader_version, 1004 .maxlen = sizeof (int), 1005 .mode = 0444, 1006 .proc_handler = proc_dointvec, 1007 }, 1008 { 1009 .procname = "io_delay_type", 1010 .data = &io_delay_type, 1011 .maxlen = sizeof(int), 1012 .mode = 0644, 1013 .proc_handler = proc_dointvec, 1014 }, 1015 #endif 1016 #if defined(CONFIG_MMU) 1017 { 1018 .procname = "randomize_va_space", 1019 .data = &randomize_va_space, 1020 .maxlen = sizeof(int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec, 1023 }, 1024 #endif 1025 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1026 { 1027 .procname = "spin_retry", 1028 .data = &spin_retry, 1029 .maxlen = sizeof (int), 1030 .mode = 0644, 1031 .proc_handler = proc_dointvec, 1032 }, 1033 #endif 1034 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1035 { 1036 .procname = "acpi_video_flags", 1037 .data = &acpi_realmode_flags, 1038 .maxlen = sizeof (unsigned long), 1039 .mode = 0644, 1040 .proc_handler = proc_doulongvec_minmax, 1041 }, 1042 #endif 1043 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1044 { 1045 .procname = "ignore-unaligned-usertrap", 1046 .data = &no_unaligned_warning, 1047 .maxlen = sizeof (int), 1048 .mode = 0644, 1049 .proc_handler = proc_dointvec, 1050 }, 1051 #endif 1052 #ifdef CONFIG_IA64 1053 { 1054 .procname = "unaligned-dump-stack", 1055 .data = &unaligned_dump_stack, 1056 .maxlen = sizeof (int), 1057 .mode = 0644, 1058 .proc_handler = proc_dointvec, 1059 }, 1060 #endif 1061 #ifdef CONFIG_DETECT_HUNG_TASK 1062 { 1063 .procname = "hung_task_panic", 1064 .data = &sysctl_hung_task_panic, 1065 .maxlen = sizeof(int), 1066 .mode = 0644, 1067 .proc_handler = proc_dointvec_minmax, 1068 .extra1 = &zero, 1069 .extra2 = &one, 1070 }, 1071 { 1072 .procname = "hung_task_check_count", 1073 .data = &sysctl_hung_task_check_count, 1074 .maxlen = sizeof(int), 1075 .mode = 0644, 1076 .proc_handler = proc_dointvec_minmax, 1077 .extra1 = &zero, 1078 }, 1079 { 1080 .procname = "hung_task_timeout_secs", 1081 .data = &sysctl_hung_task_timeout_secs, 1082 .maxlen = sizeof(unsigned long), 1083 .mode = 0644, 1084 .proc_handler = proc_dohung_task_timeout_secs, 1085 .extra2 = &hung_task_timeout_max, 1086 }, 1087 { 1088 .procname = "hung_task_warnings", 1089 .data = &sysctl_hung_task_warnings, 1090 .maxlen = sizeof(int), 1091 .mode = 0644, 1092 .proc_handler = proc_dointvec_minmax, 1093 .extra1 = &neg_one, 1094 }, 1095 #endif 1096 #ifdef CONFIG_RT_MUTEXES 1097 { 1098 .procname = "max_lock_depth", 1099 .data = &max_lock_depth, 1100 .maxlen = sizeof(int), 1101 .mode = 0644, 1102 .proc_handler = proc_dointvec, 1103 }, 1104 #endif 1105 { 1106 .procname = "poweroff_cmd", 1107 .data = &poweroff_cmd, 1108 .maxlen = POWEROFF_CMD_PATH_LEN, 1109 .mode = 0644, 1110 .proc_handler = proc_dostring, 1111 }, 1112 #ifdef CONFIG_KEYS 1113 { 1114 .procname = "keys", 1115 .mode = 0555, 1116 .child = key_sysctls, 1117 }, 1118 #endif 1119 #ifdef CONFIG_PERF_EVENTS 1120 /* 1121 * User-space scripts rely on the existence of this file 1122 * as a feature check for perf_events being enabled. 1123 * 1124 * So it's an ABI, do not remove! 1125 */ 1126 { 1127 .procname = "perf_event_paranoid", 1128 .data = &sysctl_perf_event_paranoid, 1129 .maxlen = sizeof(sysctl_perf_event_paranoid), 1130 .mode = 0644, 1131 .proc_handler = proc_dointvec, 1132 }, 1133 { 1134 .procname = "perf_event_mlock_kb", 1135 .data = &sysctl_perf_event_mlock, 1136 .maxlen = sizeof(sysctl_perf_event_mlock), 1137 .mode = 0644, 1138 .proc_handler = proc_dointvec, 1139 }, 1140 { 1141 .procname = "perf_event_max_sample_rate", 1142 .data = &sysctl_perf_event_sample_rate, 1143 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1144 .mode = 0644, 1145 .proc_handler = perf_proc_update_handler, 1146 .extra1 = &one, 1147 }, 1148 { 1149 .procname = "perf_cpu_time_max_percent", 1150 .data = &sysctl_perf_cpu_time_max_percent, 1151 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1152 .mode = 0644, 1153 .proc_handler = perf_cpu_time_max_percent_handler, 1154 .extra1 = &zero, 1155 .extra2 = &one_hundred, 1156 }, 1157 { 1158 .procname = "perf_event_max_stack", 1159 .data = &sysctl_perf_event_max_stack, 1160 .maxlen = sizeof(sysctl_perf_event_max_stack), 1161 .mode = 0644, 1162 .proc_handler = perf_event_max_stack_handler, 1163 .extra1 = &zero, 1164 .extra2 = &six_hundred_forty_kb, 1165 }, 1166 { 1167 .procname = "perf_event_max_contexts_per_stack", 1168 .data = &sysctl_perf_event_max_contexts_per_stack, 1169 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1170 .mode = 0644, 1171 .proc_handler = perf_event_max_stack_handler, 1172 .extra1 = &zero, 1173 .extra2 = &one_thousand, 1174 }, 1175 #endif 1176 { 1177 .procname = "panic_on_warn", 1178 .data = &panic_on_warn, 1179 .maxlen = sizeof(int), 1180 .mode = 0644, 1181 .proc_handler = proc_dointvec_minmax, 1182 .extra1 = &zero, 1183 .extra2 = &one, 1184 }, 1185 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1186 { 1187 .procname = "timer_migration", 1188 .data = &sysctl_timer_migration, 1189 .maxlen = sizeof(unsigned int), 1190 .mode = 0644, 1191 .proc_handler = timer_migration_handler, 1192 .extra1 = &zero, 1193 .extra2 = &one, 1194 }, 1195 #endif 1196 #ifdef CONFIG_BPF_SYSCALL 1197 { 1198 .procname = "unprivileged_bpf_disabled", 1199 .data = &sysctl_unprivileged_bpf_disabled, 1200 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1201 .mode = 0644, 1202 /* only handle a transition from default "0" to "1" */ 1203 .proc_handler = proc_dointvec_minmax, 1204 .extra1 = &one, 1205 .extra2 = &one, 1206 }, 1207 #endif 1208 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1209 { 1210 .procname = "panic_on_rcu_stall", 1211 .data = &sysctl_panic_on_rcu_stall, 1212 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1213 .mode = 0644, 1214 .proc_handler = proc_dointvec_minmax, 1215 .extra1 = &zero, 1216 .extra2 = &one, 1217 }, 1218 #endif 1219 { } 1220 }; 1221 1222 static struct ctl_table vm_table[] = { 1223 { 1224 .procname = "overcommit_memory", 1225 .data = &sysctl_overcommit_memory, 1226 .maxlen = sizeof(sysctl_overcommit_memory), 1227 .mode = 0644, 1228 .proc_handler = proc_dointvec_minmax, 1229 .extra1 = &zero, 1230 .extra2 = &two, 1231 }, 1232 { 1233 .procname = "panic_on_oom", 1234 .data = &sysctl_panic_on_oom, 1235 .maxlen = sizeof(sysctl_panic_on_oom), 1236 .mode = 0644, 1237 .proc_handler = proc_dointvec_minmax, 1238 .extra1 = &zero, 1239 .extra2 = &two, 1240 }, 1241 { 1242 .procname = "oom_kill_allocating_task", 1243 .data = &sysctl_oom_kill_allocating_task, 1244 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1245 .mode = 0644, 1246 .proc_handler = proc_dointvec, 1247 }, 1248 { 1249 .procname = "oom_dump_tasks", 1250 .data = &sysctl_oom_dump_tasks, 1251 .maxlen = sizeof(sysctl_oom_dump_tasks), 1252 .mode = 0644, 1253 .proc_handler = proc_dointvec, 1254 }, 1255 { 1256 .procname = "overcommit_ratio", 1257 .data = &sysctl_overcommit_ratio, 1258 .maxlen = sizeof(sysctl_overcommit_ratio), 1259 .mode = 0644, 1260 .proc_handler = overcommit_ratio_handler, 1261 }, 1262 { 1263 .procname = "overcommit_kbytes", 1264 .data = &sysctl_overcommit_kbytes, 1265 .maxlen = sizeof(sysctl_overcommit_kbytes), 1266 .mode = 0644, 1267 .proc_handler = overcommit_kbytes_handler, 1268 }, 1269 { 1270 .procname = "page-cluster", 1271 .data = &page_cluster, 1272 .maxlen = sizeof(int), 1273 .mode = 0644, 1274 .proc_handler = proc_dointvec_minmax, 1275 .extra1 = &zero, 1276 }, 1277 { 1278 .procname = "dirty_background_ratio", 1279 .data = &dirty_background_ratio, 1280 .maxlen = sizeof(dirty_background_ratio), 1281 .mode = 0644, 1282 .proc_handler = dirty_background_ratio_handler, 1283 .extra1 = &zero, 1284 .extra2 = &one_hundred, 1285 }, 1286 { 1287 .procname = "dirty_background_bytes", 1288 .data = &dirty_background_bytes, 1289 .maxlen = sizeof(dirty_background_bytes), 1290 .mode = 0644, 1291 .proc_handler = dirty_background_bytes_handler, 1292 .extra1 = &one_ul, 1293 }, 1294 { 1295 .procname = "dirty_ratio", 1296 .data = &vm_dirty_ratio, 1297 .maxlen = sizeof(vm_dirty_ratio), 1298 .mode = 0644, 1299 .proc_handler = dirty_ratio_handler, 1300 .extra1 = &zero, 1301 .extra2 = &one_hundred, 1302 }, 1303 { 1304 .procname = "dirty_bytes", 1305 .data = &vm_dirty_bytes, 1306 .maxlen = sizeof(vm_dirty_bytes), 1307 .mode = 0644, 1308 .proc_handler = dirty_bytes_handler, 1309 .extra1 = &dirty_bytes_min, 1310 }, 1311 { 1312 .procname = "dirty_writeback_centisecs", 1313 .data = &dirty_writeback_interval, 1314 .maxlen = sizeof(dirty_writeback_interval), 1315 .mode = 0644, 1316 .proc_handler = dirty_writeback_centisecs_handler, 1317 }, 1318 { 1319 .procname = "dirty_expire_centisecs", 1320 .data = &dirty_expire_interval, 1321 .maxlen = sizeof(dirty_expire_interval), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec_minmax, 1324 .extra1 = &zero, 1325 }, 1326 { 1327 .procname = "dirtytime_expire_seconds", 1328 .data = &dirtytime_expire_interval, 1329 .maxlen = sizeof(dirty_expire_interval), 1330 .mode = 0644, 1331 .proc_handler = dirtytime_interval_handler, 1332 .extra1 = &zero, 1333 }, 1334 { 1335 .procname = "swappiness", 1336 .data = &vm_swappiness, 1337 .maxlen = sizeof(vm_swappiness), 1338 .mode = 0644, 1339 .proc_handler = proc_dointvec_minmax, 1340 .extra1 = &zero, 1341 .extra2 = &one_hundred, 1342 }, 1343 #ifdef CONFIG_HUGETLB_PAGE 1344 { 1345 .procname = "nr_hugepages", 1346 .data = NULL, 1347 .maxlen = sizeof(unsigned long), 1348 .mode = 0644, 1349 .proc_handler = hugetlb_sysctl_handler, 1350 }, 1351 #ifdef CONFIG_NUMA 1352 { 1353 .procname = "nr_hugepages_mempolicy", 1354 .data = NULL, 1355 .maxlen = sizeof(unsigned long), 1356 .mode = 0644, 1357 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1358 }, 1359 { 1360 .procname = "numa_stat", 1361 .data = &sysctl_vm_numa_stat, 1362 .maxlen = sizeof(int), 1363 .mode = 0644, 1364 .proc_handler = sysctl_vm_numa_stat_handler, 1365 .extra1 = &zero, 1366 .extra2 = &one, 1367 }, 1368 #endif 1369 { 1370 .procname = "hugetlb_shm_group", 1371 .data = &sysctl_hugetlb_shm_group, 1372 .maxlen = sizeof(gid_t), 1373 .mode = 0644, 1374 .proc_handler = proc_dointvec, 1375 }, 1376 { 1377 .procname = "hugepages_treat_as_movable", 1378 .data = &hugepages_treat_as_movable, 1379 .maxlen = sizeof(int), 1380 .mode = 0644, 1381 .proc_handler = proc_dointvec, 1382 }, 1383 { 1384 .procname = "nr_overcommit_hugepages", 1385 .data = NULL, 1386 .maxlen = sizeof(unsigned long), 1387 .mode = 0644, 1388 .proc_handler = hugetlb_overcommit_handler, 1389 }, 1390 #endif 1391 { 1392 .procname = "lowmem_reserve_ratio", 1393 .data = &sysctl_lowmem_reserve_ratio, 1394 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1395 .mode = 0644, 1396 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1397 }, 1398 { 1399 .procname = "drop_caches", 1400 .data = &sysctl_drop_caches, 1401 .maxlen = sizeof(int), 1402 .mode = 0644, 1403 .proc_handler = drop_caches_sysctl_handler, 1404 .extra1 = &one, 1405 .extra2 = &four, 1406 }, 1407 #ifdef CONFIG_COMPACTION 1408 { 1409 .procname = "compact_memory", 1410 .data = &sysctl_compact_memory, 1411 .maxlen = sizeof(int), 1412 .mode = 0200, 1413 .proc_handler = sysctl_compaction_handler, 1414 }, 1415 { 1416 .procname = "extfrag_threshold", 1417 .data = &sysctl_extfrag_threshold, 1418 .maxlen = sizeof(int), 1419 .mode = 0644, 1420 .proc_handler = sysctl_extfrag_handler, 1421 .extra1 = &min_extfrag_threshold, 1422 .extra2 = &max_extfrag_threshold, 1423 }, 1424 { 1425 .procname = "compact_unevictable_allowed", 1426 .data = &sysctl_compact_unevictable_allowed, 1427 .maxlen = sizeof(int), 1428 .mode = 0644, 1429 .proc_handler = proc_dointvec, 1430 .extra1 = &zero, 1431 .extra2 = &one, 1432 }, 1433 1434 #endif /* CONFIG_COMPACTION */ 1435 { 1436 .procname = "min_free_kbytes", 1437 .data = &min_free_kbytes, 1438 .maxlen = sizeof(min_free_kbytes), 1439 .mode = 0644, 1440 .proc_handler = min_free_kbytes_sysctl_handler, 1441 .extra1 = &zero, 1442 }, 1443 { 1444 .procname = "watermark_scale_factor", 1445 .data = &watermark_scale_factor, 1446 .maxlen = sizeof(watermark_scale_factor), 1447 .mode = 0644, 1448 .proc_handler = watermark_scale_factor_sysctl_handler, 1449 .extra1 = &one, 1450 .extra2 = &one_thousand, 1451 }, 1452 { 1453 .procname = "percpu_pagelist_fraction", 1454 .data = &percpu_pagelist_fraction, 1455 .maxlen = sizeof(percpu_pagelist_fraction), 1456 .mode = 0644, 1457 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1458 .extra1 = &zero, 1459 }, 1460 #ifdef CONFIG_MMU 1461 { 1462 .procname = "max_map_count", 1463 .data = &sysctl_max_map_count, 1464 .maxlen = sizeof(sysctl_max_map_count), 1465 .mode = 0644, 1466 .proc_handler = proc_dointvec_minmax, 1467 .extra1 = &zero, 1468 }, 1469 #else 1470 { 1471 .procname = "nr_trim_pages", 1472 .data = &sysctl_nr_trim_pages, 1473 .maxlen = sizeof(sysctl_nr_trim_pages), 1474 .mode = 0644, 1475 .proc_handler = proc_dointvec_minmax, 1476 .extra1 = &zero, 1477 }, 1478 #endif 1479 { 1480 .procname = "laptop_mode", 1481 .data = &laptop_mode, 1482 .maxlen = sizeof(laptop_mode), 1483 .mode = 0644, 1484 .proc_handler = proc_dointvec_jiffies, 1485 }, 1486 { 1487 .procname = "block_dump", 1488 .data = &block_dump, 1489 .maxlen = sizeof(block_dump), 1490 .mode = 0644, 1491 .proc_handler = proc_dointvec, 1492 .extra1 = &zero, 1493 }, 1494 { 1495 .procname = "vfs_cache_pressure", 1496 .data = &sysctl_vfs_cache_pressure, 1497 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1498 .mode = 0644, 1499 .proc_handler = proc_dointvec, 1500 .extra1 = &zero, 1501 }, 1502 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1503 { 1504 .procname = "legacy_va_layout", 1505 .data = &sysctl_legacy_va_layout, 1506 .maxlen = sizeof(sysctl_legacy_va_layout), 1507 .mode = 0644, 1508 .proc_handler = proc_dointvec, 1509 .extra1 = &zero, 1510 }, 1511 #endif 1512 #ifdef CONFIG_NUMA 1513 { 1514 .procname = "zone_reclaim_mode", 1515 .data = &node_reclaim_mode, 1516 .maxlen = sizeof(node_reclaim_mode), 1517 .mode = 0644, 1518 .proc_handler = proc_dointvec, 1519 .extra1 = &zero, 1520 }, 1521 { 1522 .procname = "min_unmapped_ratio", 1523 .data = &sysctl_min_unmapped_ratio, 1524 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1525 .mode = 0644, 1526 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1527 .extra1 = &zero, 1528 .extra2 = &one_hundred, 1529 }, 1530 { 1531 .procname = "min_slab_ratio", 1532 .data = &sysctl_min_slab_ratio, 1533 .maxlen = sizeof(sysctl_min_slab_ratio), 1534 .mode = 0644, 1535 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1536 .extra1 = &zero, 1537 .extra2 = &one_hundred, 1538 }, 1539 #endif 1540 #ifdef CONFIG_SMP 1541 { 1542 .procname = "stat_interval", 1543 .data = &sysctl_stat_interval, 1544 .maxlen = sizeof(sysctl_stat_interval), 1545 .mode = 0644, 1546 .proc_handler = proc_dointvec_jiffies, 1547 }, 1548 { 1549 .procname = "stat_refresh", 1550 .data = NULL, 1551 .maxlen = 0, 1552 .mode = 0600, 1553 .proc_handler = vmstat_refresh, 1554 }, 1555 #endif 1556 #ifdef CONFIG_MMU 1557 { 1558 .procname = "mmap_min_addr", 1559 .data = &dac_mmap_min_addr, 1560 .maxlen = sizeof(unsigned long), 1561 .mode = 0644, 1562 .proc_handler = mmap_min_addr_handler, 1563 }, 1564 #endif 1565 #ifdef CONFIG_NUMA 1566 { 1567 .procname = "numa_zonelist_order", 1568 .data = &numa_zonelist_order, 1569 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1570 .mode = 0644, 1571 .proc_handler = numa_zonelist_order_handler, 1572 }, 1573 #endif 1574 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1575 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1576 { 1577 .procname = "vdso_enabled", 1578 #ifdef CONFIG_X86_32 1579 .data = &vdso32_enabled, 1580 .maxlen = sizeof(vdso32_enabled), 1581 #else 1582 .data = &vdso_enabled, 1583 .maxlen = sizeof(vdso_enabled), 1584 #endif 1585 .mode = 0644, 1586 .proc_handler = proc_dointvec, 1587 .extra1 = &zero, 1588 }, 1589 #endif 1590 #ifdef CONFIG_HIGHMEM 1591 { 1592 .procname = "highmem_is_dirtyable", 1593 .data = &vm_highmem_is_dirtyable, 1594 .maxlen = sizeof(vm_highmem_is_dirtyable), 1595 .mode = 0644, 1596 .proc_handler = proc_dointvec_minmax, 1597 .extra1 = &zero, 1598 .extra2 = &one, 1599 }, 1600 #endif 1601 #ifdef CONFIG_MEMORY_FAILURE 1602 { 1603 .procname = "memory_failure_early_kill", 1604 .data = &sysctl_memory_failure_early_kill, 1605 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1606 .mode = 0644, 1607 .proc_handler = proc_dointvec_minmax, 1608 .extra1 = &zero, 1609 .extra2 = &one, 1610 }, 1611 { 1612 .procname = "memory_failure_recovery", 1613 .data = &sysctl_memory_failure_recovery, 1614 .maxlen = sizeof(sysctl_memory_failure_recovery), 1615 .mode = 0644, 1616 .proc_handler = proc_dointvec_minmax, 1617 .extra1 = &zero, 1618 .extra2 = &one, 1619 }, 1620 #endif 1621 { 1622 .procname = "user_reserve_kbytes", 1623 .data = &sysctl_user_reserve_kbytes, 1624 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1625 .mode = 0644, 1626 .proc_handler = proc_doulongvec_minmax, 1627 }, 1628 { 1629 .procname = "admin_reserve_kbytes", 1630 .data = &sysctl_admin_reserve_kbytes, 1631 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1632 .mode = 0644, 1633 .proc_handler = proc_doulongvec_minmax, 1634 }, 1635 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1636 { 1637 .procname = "mmap_rnd_bits", 1638 .data = &mmap_rnd_bits, 1639 .maxlen = sizeof(mmap_rnd_bits), 1640 .mode = 0600, 1641 .proc_handler = proc_dointvec_minmax, 1642 .extra1 = (void *)&mmap_rnd_bits_min, 1643 .extra2 = (void *)&mmap_rnd_bits_max, 1644 }, 1645 #endif 1646 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1647 { 1648 .procname = "mmap_rnd_compat_bits", 1649 .data = &mmap_rnd_compat_bits, 1650 .maxlen = sizeof(mmap_rnd_compat_bits), 1651 .mode = 0600, 1652 .proc_handler = proc_dointvec_minmax, 1653 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1654 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1655 }, 1656 #endif 1657 { } 1658 }; 1659 1660 static struct ctl_table fs_table[] = { 1661 { 1662 .procname = "inode-nr", 1663 .data = &inodes_stat, 1664 .maxlen = 2*sizeof(long), 1665 .mode = 0444, 1666 .proc_handler = proc_nr_inodes, 1667 }, 1668 { 1669 .procname = "inode-state", 1670 .data = &inodes_stat, 1671 .maxlen = 7*sizeof(long), 1672 .mode = 0444, 1673 .proc_handler = proc_nr_inodes, 1674 }, 1675 { 1676 .procname = "file-nr", 1677 .data = &files_stat, 1678 .maxlen = sizeof(files_stat), 1679 .mode = 0444, 1680 .proc_handler = proc_nr_files, 1681 }, 1682 { 1683 .procname = "file-max", 1684 .data = &files_stat.max_files, 1685 .maxlen = sizeof(files_stat.max_files), 1686 .mode = 0644, 1687 .proc_handler = proc_doulongvec_minmax, 1688 }, 1689 { 1690 .procname = "nr_open", 1691 .data = &sysctl_nr_open, 1692 .maxlen = sizeof(unsigned int), 1693 .mode = 0644, 1694 .proc_handler = proc_dointvec_minmax, 1695 .extra1 = &sysctl_nr_open_min, 1696 .extra2 = &sysctl_nr_open_max, 1697 }, 1698 { 1699 .procname = "dentry-state", 1700 .data = &dentry_stat, 1701 .maxlen = 6*sizeof(long), 1702 .mode = 0444, 1703 .proc_handler = proc_nr_dentry, 1704 }, 1705 { 1706 .procname = "overflowuid", 1707 .data = &fs_overflowuid, 1708 .maxlen = sizeof(int), 1709 .mode = 0644, 1710 .proc_handler = proc_dointvec_minmax, 1711 .extra1 = &minolduid, 1712 .extra2 = &maxolduid, 1713 }, 1714 { 1715 .procname = "overflowgid", 1716 .data = &fs_overflowgid, 1717 .maxlen = sizeof(int), 1718 .mode = 0644, 1719 .proc_handler = proc_dointvec_minmax, 1720 .extra1 = &minolduid, 1721 .extra2 = &maxolduid, 1722 }, 1723 #ifdef CONFIG_FILE_LOCKING 1724 { 1725 .procname = "leases-enable", 1726 .data = &leases_enable, 1727 .maxlen = sizeof(int), 1728 .mode = 0644, 1729 .proc_handler = proc_dointvec, 1730 }, 1731 #endif 1732 #ifdef CONFIG_DNOTIFY 1733 { 1734 .procname = "dir-notify-enable", 1735 .data = &dir_notify_enable, 1736 .maxlen = sizeof(int), 1737 .mode = 0644, 1738 .proc_handler = proc_dointvec, 1739 }, 1740 #endif 1741 #ifdef CONFIG_MMU 1742 #ifdef CONFIG_FILE_LOCKING 1743 { 1744 .procname = "lease-break-time", 1745 .data = &lease_break_time, 1746 .maxlen = sizeof(int), 1747 .mode = 0644, 1748 .proc_handler = proc_dointvec, 1749 }, 1750 #endif 1751 #ifdef CONFIG_AIO 1752 { 1753 .procname = "aio-nr", 1754 .data = &aio_nr, 1755 .maxlen = sizeof(aio_nr), 1756 .mode = 0444, 1757 .proc_handler = proc_doulongvec_minmax, 1758 }, 1759 { 1760 .procname = "aio-max-nr", 1761 .data = &aio_max_nr, 1762 .maxlen = sizeof(aio_max_nr), 1763 .mode = 0644, 1764 .proc_handler = proc_doulongvec_minmax, 1765 }, 1766 #endif /* CONFIG_AIO */ 1767 #ifdef CONFIG_INOTIFY_USER 1768 { 1769 .procname = "inotify", 1770 .mode = 0555, 1771 .child = inotify_table, 1772 }, 1773 #endif 1774 #ifdef CONFIG_EPOLL 1775 { 1776 .procname = "epoll", 1777 .mode = 0555, 1778 .child = epoll_table, 1779 }, 1780 #endif 1781 #endif 1782 { 1783 .procname = "protected_symlinks", 1784 .data = &sysctl_protected_symlinks, 1785 .maxlen = sizeof(int), 1786 .mode = 0600, 1787 .proc_handler = proc_dointvec_minmax, 1788 .extra1 = &zero, 1789 .extra2 = &one, 1790 }, 1791 { 1792 .procname = "protected_hardlinks", 1793 .data = &sysctl_protected_hardlinks, 1794 .maxlen = sizeof(int), 1795 .mode = 0600, 1796 .proc_handler = proc_dointvec_minmax, 1797 .extra1 = &zero, 1798 .extra2 = &one, 1799 }, 1800 { 1801 .procname = "suid_dumpable", 1802 .data = &suid_dumpable, 1803 .maxlen = sizeof(int), 1804 .mode = 0644, 1805 .proc_handler = proc_dointvec_minmax_coredump, 1806 .extra1 = &zero, 1807 .extra2 = &two, 1808 }, 1809 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1810 { 1811 .procname = "binfmt_misc", 1812 .mode = 0555, 1813 .child = sysctl_mount_point, 1814 }, 1815 #endif 1816 { 1817 .procname = "pipe-max-size", 1818 .data = &pipe_max_size, 1819 .maxlen = sizeof(int), 1820 .mode = 0644, 1821 .proc_handler = &pipe_proc_fn, 1822 .extra1 = &pipe_min_size, 1823 }, 1824 { 1825 .procname = "pipe-user-pages-hard", 1826 .data = &pipe_user_pages_hard, 1827 .maxlen = sizeof(pipe_user_pages_hard), 1828 .mode = 0644, 1829 .proc_handler = proc_doulongvec_minmax, 1830 }, 1831 { 1832 .procname = "pipe-user-pages-soft", 1833 .data = &pipe_user_pages_soft, 1834 .maxlen = sizeof(pipe_user_pages_soft), 1835 .mode = 0644, 1836 .proc_handler = proc_doulongvec_minmax, 1837 }, 1838 { 1839 .procname = "mount-max", 1840 .data = &sysctl_mount_max, 1841 .maxlen = sizeof(unsigned int), 1842 .mode = 0644, 1843 .proc_handler = proc_dointvec_minmax, 1844 .extra1 = &one, 1845 }, 1846 { } 1847 }; 1848 1849 static struct ctl_table debug_table[] = { 1850 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1851 { 1852 .procname = "exception-trace", 1853 .data = &show_unhandled_signals, 1854 .maxlen = sizeof(int), 1855 .mode = 0644, 1856 .proc_handler = proc_dointvec 1857 }, 1858 #endif 1859 #if defined(CONFIG_OPTPROBES) 1860 { 1861 .procname = "kprobes-optimization", 1862 .data = &sysctl_kprobes_optimization, 1863 .maxlen = sizeof(int), 1864 .mode = 0644, 1865 .proc_handler = proc_kprobes_optimization_handler, 1866 .extra1 = &zero, 1867 .extra2 = &one, 1868 }, 1869 #endif 1870 { } 1871 }; 1872 1873 static struct ctl_table dev_table[] = { 1874 { } 1875 }; 1876 1877 int __init sysctl_init(void) 1878 { 1879 struct ctl_table_header *hdr; 1880 1881 hdr = register_sysctl_table(sysctl_base_table); 1882 kmemleak_not_leak(hdr); 1883 return 0; 1884 } 1885 1886 #endif /* CONFIG_SYSCTL */ 1887 1888 /* 1889 * /proc/sys support 1890 */ 1891 1892 #ifdef CONFIG_PROC_SYSCTL 1893 1894 static int _proc_do_string(char *data, int maxlen, int write, 1895 char __user *buffer, 1896 size_t *lenp, loff_t *ppos) 1897 { 1898 size_t len; 1899 char __user *p; 1900 char c; 1901 1902 if (!data || !maxlen || !*lenp) { 1903 *lenp = 0; 1904 return 0; 1905 } 1906 1907 if (write) { 1908 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1909 /* Only continue writes not past the end of buffer. */ 1910 len = strlen(data); 1911 if (len > maxlen - 1) 1912 len = maxlen - 1; 1913 1914 if (*ppos > len) 1915 return 0; 1916 len = *ppos; 1917 } else { 1918 /* Start writing from beginning of buffer. */ 1919 len = 0; 1920 } 1921 1922 *ppos += *lenp; 1923 p = buffer; 1924 while ((p - buffer) < *lenp && len < maxlen - 1) { 1925 if (get_user(c, p++)) 1926 return -EFAULT; 1927 if (c == 0 || c == '\n') 1928 break; 1929 data[len++] = c; 1930 } 1931 data[len] = 0; 1932 } else { 1933 len = strlen(data); 1934 if (len > maxlen) 1935 len = maxlen; 1936 1937 if (*ppos > len) { 1938 *lenp = 0; 1939 return 0; 1940 } 1941 1942 data += *ppos; 1943 len -= *ppos; 1944 1945 if (len > *lenp) 1946 len = *lenp; 1947 if (len) 1948 if (copy_to_user(buffer, data, len)) 1949 return -EFAULT; 1950 if (len < *lenp) { 1951 if (put_user('\n', buffer + len)) 1952 return -EFAULT; 1953 len++; 1954 } 1955 *lenp = len; 1956 *ppos += len; 1957 } 1958 return 0; 1959 } 1960 1961 static void warn_sysctl_write(struct ctl_table *table) 1962 { 1963 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1964 "This will not be supported in the future. To silence this\n" 1965 "warning, set kernel.sysctl_writes_strict = -1\n", 1966 current->comm, table->procname); 1967 } 1968 1969 /** 1970 * proc_first_pos_non_zero_ignore - check if firs position is allowed 1971 * @ppos: file position 1972 * @table: the sysctl table 1973 * 1974 * Returns true if the first position is non-zero and the sysctl_writes_strict 1975 * mode indicates this is not allowed for numeric input types. String proc 1976 * hadlers can ignore the return value. 1977 */ 1978 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 1979 struct ctl_table *table) 1980 { 1981 if (!*ppos) 1982 return false; 1983 1984 switch (sysctl_writes_strict) { 1985 case SYSCTL_WRITES_STRICT: 1986 return true; 1987 case SYSCTL_WRITES_WARN: 1988 warn_sysctl_write(table); 1989 return false; 1990 default: 1991 return false; 1992 } 1993 } 1994 1995 /** 1996 * proc_dostring - read a string sysctl 1997 * @table: the sysctl table 1998 * @write: %TRUE if this is a write to the sysctl file 1999 * @buffer: the user buffer 2000 * @lenp: the size of the user buffer 2001 * @ppos: file position 2002 * 2003 * Reads/writes a string from/to the user buffer. If the kernel 2004 * buffer provided is not large enough to hold the string, the 2005 * string is truncated. The copied string is %NULL-terminated. 2006 * If the string is being read by the user process, it is copied 2007 * and a newline '\n' is added. It is truncated if the buffer is 2008 * not large enough. 2009 * 2010 * Returns 0 on success. 2011 */ 2012 int proc_dostring(struct ctl_table *table, int write, 2013 void __user *buffer, size_t *lenp, loff_t *ppos) 2014 { 2015 if (write) 2016 proc_first_pos_non_zero_ignore(ppos, table); 2017 2018 return _proc_do_string((char *)(table->data), table->maxlen, write, 2019 (char __user *)buffer, lenp, ppos); 2020 } 2021 2022 static size_t proc_skip_spaces(char **buf) 2023 { 2024 size_t ret; 2025 char *tmp = skip_spaces(*buf); 2026 ret = tmp - *buf; 2027 *buf = tmp; 2028 return ret; 2029 } 2030 2031 static void proc_skip_char(char **buf, size_t *size, const char v) 2032 { 2033 while (*size) { 2034 if (**buf != v) 2035 break; 2036 (*size)--; 2037 (*buf)++; 2038 } 2039 } 2040 2041 #define TMPBUFLEN 22 2042 /** 2043 * proc_get_long - reads an ASCII formatted integer from a user buffer 2044 * 2045 * @buf: a kernel buffer 2046 * @size: size of the kernel buffer 2047 * @val: this is where the number will be stored 2048 * @neg: set to %TRUE if number is negative 2049 * @perm_tr: a vector which contains the allowed trailers 2050 * @perm_tr_len: size of the perm_tr vector 2051 * @tr: pointer to store the trailer character 2052 * 2053 * In case of success %0 is returned and @buf and @size are updated with 2054 * the amount of bytes read. If @tr is non-NULL and a trailing 2055 * character exists (size is non-zero after returning from this 2056 * function), @tr is updated with the trailing character. 2057 */ 2058 static int proc_get_long(char **buf, size_t *size, 2059 unsigned long *val, bool *neg, 2060 const char *perm_tr, unsigned perm_tr_len, char *tr) 2061 { 2062 int len; 2063 char *p, tmp[TMPBUFLEN]; 2064 2065 if (!*size) 2066 return -EINVAL; 2067 2068 len = *size; 2069 if (len > TMPBUFLEN - 1) 2070 len = TMPBUFLEN - 1; 2071 2072 memcpy(tmp, *buf, len); 2073 2074 tmp[len] = 0; 2075 p = tmp; 2076 if (*p == '-' && *size > 1) { 2077 *neg = true; 2078 p++; 2079 } else 2080 *neg = false; 2081 if (!isdigit(*p)) 2082 return -EINVAL; 2083 2084 *val = simple_strtoul(p, &p, 0); 2085 2086 len = p - tmp; 2087 2088 /* We don't know if the next char is whitespace thus we may accept 2089 * invalid integers (e.g. 1234...a) or two integers instead of one 2090 * (e.g. 123...1). So lets not allow such large numbers. */ 2091 if (len == TMPBUFLEN - 1) 2092 return -EINVAL; 2093 2094 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2095 return -EINVAL; 2096 2097 if (tr && (len < *size)) 2098 *tr = *p; 2099 2100 *buf += len; 2101 *size -= len; 2102 2103 return 0; 2104 } 2105 2106 /** 2107 * proc_put_long - converts an integer to a decimal ASCII formatted string 2108 * 2109 * @buf: the user buffer 2110 * @size: the size of the user buffer 2111 * @val: the integer to be converted 2112 * @neg: sign of the number, %TRUE for negative 2113 * 2114 * In case of success %0 is returned and @buf and @size are updated with 2115 * the amount of bytes written. 2116 */ 2117 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2118 bool neg) 2119 { 2120 int len; 2121 char tmp[TMPBUFLEN], *p = tmp; 2122 2123 sprintf(p, "%s%lu", neg ? "-" : "", val); 2124 len = strlen(tmp); 2125 if (len > *size) 2126 len = *size; 2127 if (copy_to_user(*buf, tmp, len)) 2128 return -EFAULT; 2129 *size -= len; 2130 *buf += len; 2131 return 0; 2132 } 2133 #undef TMPBUFLEN 2134 2135 static int proc_put_char(void __user **buf, size_t *size, char c) 2136 { 2137 if (*size) { 2138 char __user **buffer = (char __user **)buf; 2139 if (put_user(c, *buffer)) 2140 return -EFAULT; 2141 (*size)--, (*buffer)++; 2142 *buf = *buffer; 2143 } 2144 return 0; 2145 } 2146 2147 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2148 int *valp, 2149 int write, void *data) 2150 { 2151 if (write) { 2152 if (*negp) { 2153 if (*lvalp > (unsigned long) INT_MAX + 1) 2154 return -EINVAL; 2155 *valp = -*lvalp; 2156 } else { 2157 if (*lvalp > (unsigned long) INT_MAX) 2158 return -EINVAL; 2159 *valp = *lvalp; 2160 } 2161 } else { 2162 int val = *valp; 2163 if (val < 0) { 2164 *negp = true; 2165 *lvalp = -(unsigned long)val; 2166 } else { 2167 *negp = false; 2168 *lvalp = (unsigned long)val; 2169 } 2170 } 2171 return 0; 2172 } 2173 2174 static int do_proc_douintvec_conv(unsigned long *lvalp, 2175 unsigned int *valp, 2176 int write, void *data) 2177 { 2178 if (write) { 2179 if (*lvalp > UINT_MAX) 2180 return -EINVAL; 2181 *valp = *lvalp; 2182 } else { 2183 unsigned int val = *valp; 2184 *lvalp = (unsigned long)val; 2185 } 2186 return 0; 2187 } 2188 2189 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2190 2191 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2192 int write, void __user *buffer, 2193 size_t *lenp, loff_t *ppos, 2194 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2195 int write, void *data), 2196 void *data) 2197 { 2198 int *i, vleft, first = 1, err = 0; 2199 size_t left; 2200 char *kbuf = NULL, *p; 2201 2202 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2203 *lenp = 0; 2204 return 0; 2205 } 2206 2207 i = (int *) tbl_data; 2208 vleft = table->maxlen / sizeof(*i); 2209 left = *lenp; 2210 2211 if (!conv) 2212 conv = do_proc_dointvec_conv; 2213 2214 if (write) { 2215 if (proc_first_pos_non_zero_ignore(ppos, table)) 2216 goto out; 2217 2218 if (left > PAGE_SIZE - 1) 2219 left = PAGE_SIZE - 1; 2220 p = kbuf = memdup_user_nul(buffer, left); 2221 if (IS_ERR(kbuf)) 2222 return PTR_ERR(kbuf); 2223 } 2224 2225 for (; left && vleft--; i++, first=0) { 2226 unsigned long lval; 2227 bool neg; 2228 2229 if (write) { 2230 left -= proc_skip_spaces(&p); 2231 2232 if (!left) 2233 break; 2234 err = proc_get_long(&p, &left, &lval, &neg, 2235 proc_wspace_sep, 2236 sizeof(proc_wspace_sep), NULL); 2237 if (err) 2238 break; 2239 if (conv(&neg, &lval, i, 1, data)) { 2240 err = -EINVAL; 2241 break; 2242 } 2243 } else { 2244 if (conv(&neg, &lval, i, 0, data)) { 2245 err = -EINVAL; 2246 break; 2247 } 2248 if (!first) 2249 err = proc_put_char(&buffer, &left, '\t'); 2250 if (err) 2251 break; 2252 err = proc_put_long(&buffer, &left, lval, neg); 2253 if (err) 2254 break; 2255 } 2256 } 2257 2258 if (!write && !first && left && !err) 2259 err = proc_put_char(&buffer, &left, '\n'); 2260 if (write && !err && left) 2261 left -= proc_skip_spaces(&p); 2262 if (write) { 2263 kfree(kbuf); 2264 if (first) 2265 return err ? : -EINVAL; 2266 } 2267 *lenp -= left; 2268 out: 2269 *ppos += *lenp; 2270 return err; 2271 } 2272 2273 static int do_proc_dointvec(struct ctl_table *table, int write, 2274 void __user *buffer, size_t *lenp, loff_t *ppos, 2275 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2276 int write, void *data), 2277 void *data) 2278 { 2279 return __do_proc_dointvec(table->data, table, write, 2280 buffer, lenp, ppos, conv, data); 2281 } 2282 2283 static int do_proc_douintvec_w(unsigned int *tbl_data, 2284 struct ctl_table *table, 2285 void __user *buffer, 2286 size_t *lenp, loff_t *ppos, 2287 int (*conv)(unsigned long *lvalp, 2288 unsigned int *valp, 2289 int write, void *data), 2290 void *data) 2291 { 2292 unsigned long lval; 2293 int err = 0; 2294 size_t left; 2295 bool neg; 2296 char *kbuf = NULL, *p; 2297 2298 left = *lenp; 2299 2300 if (proc_first_pos_non_zero_ignore(ppos, table)) 2301 goto bail_early; 2302 2303 if (left > PAGE_SIZE - 1) 2304 left = PAGE_SIZE - 1; 2305 2306 p = kbuf = memdup_user_nul(buffer, left); 2307 if (IS_ERR(kbuf)) 2308 return -EINVAL; 2309 2310 left -= proc_skip_spaces(&p); 2311 if (!left) { 2312 err = -EINVAL; 2313 goto out_free; 2314 } 2315 2316 err = proc_get_long(&p, &left, &lval, &neg, 2317 proc_wspace_sep, 2318 sizeof(proc_wspace_sep), NULL); 2319 if (err || neg) { 2320 err = -EINVAL; 2321 goto out_free; 2322 } 2323 2324 if (conv(&lval, tbl_data, 1, data)) { 2325 err = -EINVAL; 2326 goto out_free; 2327 } 2328 2329 if (!err && left) 2330 left -= proc_skip_spaces(&p); 2331 2332 out_free: 2333 kfree(kbuf); 2334 if (err) 2335 return -EINVAL; 2336 2337 return 0; 2338 2339 /* This is in keeping with old __do_proc_dointvec() */ 2340 bail_early: 2341 *ppos += *lenp; 2342 return err; 2343 } 2344 2345 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2346 size_t *lenp, loff_t *ppos, 2347 int (*conv)(unsigned long *lvalp, 2348 unsigned int *valp, 2349 int write, void *data), 2350 void *data) 2351 { 2352 unsigned long lval; 2353 int err = 0; 2354 size_t left; 2355 2356 left = *lenp; 2357 2358 if (conv(&lval, tbl_data, 0, data)) { 2359 err = -EINVAL; 2360 goto out; 2361 } 2362 2363 err = proc_put_long(&buffer, &left, lval, false); 2364 if (err || !left) 2365 goto out; 2366 2367 err = proc_put_char(&buffer, &left, '\n'); 2368 2369 out: 2370 *lenp -= left; 2371 *ppos += *lenp; 2372 2373 return err; 2374 } 2375 2376 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2377 int write, void __user *buffer, 2378 size_t *lenp, loff_t *ppos, 2379 int (*conv)(unsigned long *lvalp, 2380 unsigned int *valp, 2381 int write, void *data), 2382 void *data) 2383 { 2384 unsigned int *i, vleft; 2385 2386 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2387 *lenp = 0; 2388 return 0; 2389 } 2390 2391 i = (unsigned int *) tbl_data; 2392 vleft = table->maxlen / sizeof(*i); 2393 2394 /* 2395 * Arrays are not supported, keep this simple. *Do not* add 2396 * support for them. 2397 */ 2398 if (vleft != 1) { 2399 *lenp = 0; 2400 return -EINVAL; 2401 } 2402 2403 if (!conv) 2404 conv = do_proc_douintvec_conv; 2405 2406 if (write) 2407 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2408 conv, data); 2409 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2410 } 2411 2412 static int do_proc_douintvec(struct ctl_table *table, int write, 2413 void __user *buffer, size_t *lenp, loff_t *ppos, 2414 int (*conv)(unsigned long *lvalp, 2415 unsigned int *valp, 2416 int write, void *data), 2417 void *data) 2418 { 2419 return __do_proc_douintvec(table->data, table, write, 2420 buffer, lenp, ppos, conv, data); 2421 } 2422 2423 /** 2424 * proc_dointvec - read a vector of integers 2425 * @table: the sysctl table 2426 * @write: %TRUE if this is a write to the sysctl file 2427 * @buffer: the user buffer 2428 * @lenp: the size of the user buffer 2429 * @ppos: file position 2430 * 2431 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2432 * values from/to the user buffer, treated as an ASCII string. 2433 * 2434 * Returns 0 on success. 2435 */ 2436 int proc_dointvec(struct ctl_table *table, int write, 2437 void __user *buffer, size_t *lenp, loff_t *ppos) 2438 { 2439 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2440 } 2441 2442 /** 2443 * proc_douintvec - read a vector of unsigned integers 2444 * @table: the sysctl table 2445 * @write: %TRUE if this is a write to the sysctl file 2446 * @buffer: the user buffer 2447 * @lenp: the size of the user buffer 2448 * @ppos: file position 2449 * 2450 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2451 * values from/to the user buffer, treated as an ASCII string. 2452 * 2453 * Returns 0 on success. 2454 */ 2455 int proc_douintvec(struct ctl_table *table, int write, 2456 void __user *buffer, size_t *lenp, loff_t *ppos) 2457 { 2458 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2459 do_proc_douintvec_conv, NULL); 2460 } 2461 2462 /* 2463 * Taint values can only be increased 2464 * This means we can safely use a temporary. 2465 */ 2466 static int proc_taint(struct ctl_table *table, int write, 2467 void __user *buffer, size_t *lenp, loff_t *ppos) 2468 { 2469 struct ctl_table t; 2470 unsigned long tmptaint = get_taint(); 2471 int err; 2472 2473 if (write && !capable(CAP_SYS_ADMIN)) 2474 return -EPERM; 2475 2476 t = *table; 2477 t.data = &tmptaint; 2478 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2479 if (err < 0) 2480 return err; 2481 2482 if (write) { 2483 /* 2484 * Poor man's atomic or. Not worth adding a primitive 2485 * to everyone's atomic.h for this 2486 */ 2487 int i; 2488 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2489 if ((tmptaint >> i) & 1) 2490 add_taint(i, LOCKDEP_STILL_OK); 2491 } 2492 } 2493 2494 return err; 2495 } 2496 2497 #ifdef CONFIG_PRINTK 2498 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2499 void __user *buffer, size_t *lenp, loff_t *ppos) 2500 { 2501 if (write && !capable(CAP_SYS_ADMIN)) 2502 return -EPERM; 2503 2504 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2505 } 2506 #endif 2507 2508 struct do_proc_dointvec_minmax_conv_param { 2509 int *min; 2510 int *max; 2511 }; 2512 2513 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2514 int *valp, 2515 int write, void *data) 2516 { 2517 struct do_proc_dointvec_minmax_conv_param *param = data; 2518 if (write) { 2519 int val = *negp ? -*lvalp : *lvalp; 2520 if ((param->min && *param->min > val) || 2521 (param->max && *param->max < val)) 2522 return -EINVAL; 2523 *valp = val; 2524 } else { 2525 int val = *valp; 2526 if (val < 0) { 2527 *negp = true; 2528 *lvalp = -(unsigned long)val; 2529 } else { 2530 *negp = false; 2531 *lvalp = (unsigned long)val; 2532 } 2533 } 2534 return 0; 2535 } 2536 2537 /** 2538 * proc_dointvec_minmax - read a vector of integers with min/max values 2539 * @table: the sysctl table 2540 * @write: %TRUE if this is a write to the sysctl file 2541 * @buffer: the user buffer 2542 * @lenp: the size of the user buffer 2543 * @ppos: file position 2544 * 2545 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2546 * values from/to the user buffer, treated as an ASCII string. 2547 * 2548 * This routine will ensure the values are within the range specified by 2549 * table->extra1 (min) and table->extra2 (max). 2550 * 2551 * Returns 0 on success. 2552 */ 2553 int proc_dointvec_minmax(struct ctl_table *table, int write, 2554 void __user *buffer, size_t *lenp, loff_t *ppos) 2555 { 2556 struct do_proc_dointvec_minmax_conv_param param = { 2557 .min = (int *) table->extra1, 2558 .max = (int *) table->extra2, 2559 }; 2560 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2561 do_proc_dointvec_minmax_conv, ¶m); 2562 } 2563 2564 struct do_proc_douintvec_minmax_conv_param { 2565 unsigned int *min; 2566 unsigned int *max; 2567 }; 2568 2569 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2570 unsigned int *valp, 2571 int write, void *data) 2572 { 2573 struct do_proc_douintvec_minmax_conv_param *param = data; 2574 2575 if (write) { 2576 unsigned int val = *lvalp; 2577 2578 if ((param->min && *param->min > val) || 2579 (param->max && *param->max < val)) 2580 return -ERANGE; 2581 2582 if (*lvalp > UINT_MAX) 2583 return -EINVAL; 2584 *valp = val; 2585 } else { 2586 unsigned int val = *valp; 2587 *lvalp = (unsigned long) val; 2588 } 2589 2590 return 0; 2591 } 2592 2593 /** 2594 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2595 * @table: the sysctl table 2596 * @write: %TRUE if this is a write to the sysctl file 2597 * @buffer: the user buffer 2598 * @lenp: the size of the user buffer 2599 * @ppos: file position 2600 * 2601 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2602 * values from/to the user buffer, treated as an ASCII string. Negative 2603 * strings are not allowed. 2604 * 2605 * This routine will ensure the values are within the range specified by 2606 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2607 * check for UINT_MAX to avoid having to support wrap around uses from 2608 * userspace. 2609 * 2610 * Returns 0 on success. 2611 */ 2612 int proc_douintvec_minmax(struct ctl_table *table, int write, 2613 void __user *buffer, size_t *lenp, loff_t *ppos) 2614 { 2615 struct do_proc_douintvec_minmax_conv_param param = { 2616 .min = (unsigned int *) table->extra1, 2617 .max = (unsigned int *) table->extra2, 2618 }; 2619 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2620 do_proc_douintvec_minmax_conv, ¶m); 2621 } 2622 2623 static void validate_coredump_safety(void) 2624 { 2625 #ifdef CONFIG_COREDUMP 2626 if (suid_dumpable == SUID_DUMP_ROOT && 2627 core_pattern[0] != '/' && core_pattern[0] != '|') { 2628 printk(KERN_WARNING 2629 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2630 "Pipe handler or fully qualified core dump path required.\n" 2631 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2632 ); 2633 } 2634 #endif 2635 } 2636 2637 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2638 void __user *buffer, size_t *lenp, loff_t *ppos) 2639 { 2640 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2641 if (!error) 2642 validate_coredump_safety(); 2643 return error; 2644 } 2645 2646 #ifdef CONFIG_COREDUMP 2647 static int proc_dostring_coredump(struct ctl_table *table, int write, 2648 void __user *buffer, size_t *lenp, loff_t *ppos) 2649 { 2650 int error = proc_dostring(table, write, buffer, lenp, ppos); 2651 if (!error) 2652 validate_coredump_safety(); 2653 return error; 2654 } 2655 #endif 2656 2657 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2658 void __user *buffer, 2659 size_t *lenp, loff_t *ppos, 2660 unsigned long convmul, 2661 unsigned long convdiv) 2662 { 2663 unsigned long *i, *min, *max; 2664 int vleft, first = 1, err = 0; 2665 size_t left; 2666 char *kbuf = NULL, *p; 2667 2668 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2669 *lenp = 0; 2670 return 0; 2671 } 2672 2673 i = (unsigned long *) data; 2674 min = (unsigned long *) table->extra1; 2675 max = (unsigned long *) table->extra2; 2676 vleft = table->maxlen / sizeof(unsigned long); 2677 left = *lenp; 2678 2679 if (write) { 2680 if (proc_first_pos_non_zero_ignore(ppos, table)) 2681 goto out; 2682 2683 if (left > PAGE_SIZE - 1) 2684 left = PAGE_SIZE - 1; 2685 p = kbuf = memdup_user_nul(buffer, left); 2686 if (IS_ERR(kbuf)) 2687 return PTR_ERR(kbuf); 2688 } 2689 2690 for (; left && vleft--; i++, first = 0) { 2691 unsigned long val; 2692 2693 if (write) { 2694 bool neg; 2695 2696 left -= proc_skip_spaces(&p); 2697 2698 err = proc_get_long(&p, &left, &val, &neg, 2699 proc_wspace_sep, 2700 sizeof(proc_wspace_sep), NULL); 2701 if (err) 2702 break; 2703 if (neg) 2704 continue; 2705 val = convmul * val / convdiv; 2706 if ((min && val < *min) || (max && val > *max)) 2707 continue; 2708 *i = val; 2709 } else { 2710 val = convdiv * (*i) / convmul; 2711 if (!first) { 2712 err = proc_put_char(&buffer, &left, '\t'); 2713 if (err) 2714 break; 2715 } 2716 err = proc_put_long(&buffer, &left, val, false); 2717 if (err) 2718 break; 2719 } 2720 } 2721 2722 if (!write && !first && left && !err) 2723 err = proc_put_char(&buffer, &left, '\n'); 2724 if (write && !err) 2725 left -= proc_skip_spaces(&p); 2726 if (write) { 2727 kfree(kbuf); 2728 if (first) 2729 return err ? : -EINVAL; 2730 } 2731 *lenp -= left; 2732 out: 2733 *ppos += *lenp; 2734 return err; 2735 } 2736 2737 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2738 void __user *buffer, 2739 size_t *lenp, loff_t *ppos, 2740 unsigned long convmul, 2741 unsigned long convdiv) 2742 { 2743 return __do_proc_doulongvec_minmax(table->data, table, write, 2744 buffer, lenp, ppos, convmul, convdiv); 2745 } 2746 2747 /** 2748 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2749 * @table: the sysctl table 2750 * @write: %TRUE if this is a write to the sysctl file 2751 * @buffer: the user buffer 2752 * @lenp: the size of the user buffer 2753 * @ppos: file position 2754 * 2755 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2756 * values from/to the user buffer, treated as an ASCII string. 2757 * 2758 * This routine will ensure the values are within the range specified by 2759 * table->extra1 (min) and table->extra2 (max). 2760 * 2761 * Returns 0 on success. 2762 */ 2763 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2764 void __user *buffer, size_t *lenp, loff_t *ppos) 2765 { 2766 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2767 } 2768 2769 /** 2770 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2771 * @table: the sysctl table 2772 * @write: %TRUE if this is a write to the sysctl file 2773 * @buffer: the user buffer 2774 * @lenp: the size of the user buffer 2775 * @ppos: file position 2776 * 2777 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2778 * values from/to the user buffer, treated as an ASCII string. The values 2779 * are treated as milliseconds, and converted to jiffies when they are stored. 2780 * 2781 * This routine will ensure the values are within the range specified by 2782 * table->extra1 (min) and table->extra2 (max). 2783 * 2784 * Returns 0 on success. 2785 */ 2786 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2787 void __user *buffer, 2788 size_t *lenp, loff_t *ppos) 2789 { 2790 return do_proc_doulongvec_minmax(table, write, buffer, 2791 lenp, ppos, HZ, 1000l); 2792 } 2793 2794 2795 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2796 int *valp, 2797 int write, void *data) 2798 { 2799 if (write) { 2800 if (*lvalp > INT_MAX / HZ) 2801 return 1; 2802 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2803 } else { 2804 int val = *valp; 2805 unsigned long lval; 2806 if (val < 0) { 2807 *negp = true; 2808 lval = -(unsigned long)val; 2809 } else { 2810 *negp = false; 2811 lval = (unsigned long)val; 2812 } 2813 *lvalp = lval / HZ; 2814 } 2815 return 0; 2816 } 2817 2818 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2819 int *valp, 2820 int write, void *data) 2821 { 2822 if (write) { 2823 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2824 return 1; 2825 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2826 } else { 2827 int val = *valp; 2828 unsigned long lval; 2829 if (val < 0) { 2830 *negp = true; 2831 lval = -(unsigned long)val; 2832 } else { 2833 *negp = false; 2834 lval = (unsigned long)val; 2835 } 2836 *lvalp = jiffies_to_clock_t(lval); 2837 } 2838 return 0; 2839 } 2840 2841 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2842 int *valp, 2843 int write, void *data) 2844 { 2845 if (write) { 2846 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2847 2848 if (jif > INT_MAX) 2849 return 1; 2850 *valp = (int)jif; 2851 } else { 2852 int val = *valp; 2853 unsigned long lval; 2854 if (val < 0) { 2855 *negp = true; 2856 lval = -(unsigned long)val; 2857 } else { 2858 *negp = false; 2859 lval = (unsigned long)val; 2860 } 2861 *lvalp = jiffies_to_msecs(lval); 2862 } 2863 return 0; 2864 } 2865 2866 /** 2867 * proc_dointvec_jiffies - read a vector of integers as seconds 2868 * @table: the sysctl table 2869 * @write: %TRUE if this is a write to the sysctl file 2870 * @buffer: the user buffer 2871 * @lenp: the size of the user buffer 2872 * @ppos: file position 2873 * 2874 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2875 * values from/to the user buffer, treated as an ASCII string. 2876 * The values read are assumed to be in seconds, and are converted into 2877 * jiffies. 2878 * 2879 * Returns 0 on success. 2880 */ 2881 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2882 void __user *buffer, size_t *lenp, loff_t *ppos) 2883 { 2884 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2885 do_proc_dointvec_jiffies_conv,NULL); 2886 } 2887 2888 /** 2889 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2890 * @table: the sysctl table 2891 * @write: %TRUE if this is a write to the sysctl file 2892 * @buffer: the user buffer 2893 * @lenp: the size of the user buffer 2894 * @ppos: pointer to the file position 2895 * 2896 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2897 * values from/to the user buffer, treated as an ASCII string. 2898 * The values read are assumed to be in 1/USER_HZ seconds, and 2899 * are converted into jiffies. 2900 * 2901 * Returns 0 on success. 2902 */ 2903 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2904 void __user *buffer, size_t *lenp, loff_t *ppos) 2905 { 2906 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2907 do_proc_dointvec_userhz_jiffies_conv,NULL); 2908 } 2909 2910 /** 2911 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2912 * @table: the sysctl table 2913 * @write: %TRUE if this is a write to the sysctl file 2914 * @buffer: the user buffer 2915 * @lenp: the size of the user buffer 2916 * @ppos: file position 2917 * @ppos: the current position in the file 2918 * 2919 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2920 * values from/to the user buffer, treated as an ASCII string. 2921 * The values read are assumed to be in 1/1000 seconds, and 2922 * are converted into jiffies. 2923 * 2924 * Returns 0 on success. 2925 */ 2926 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2927 void __user *buffer, size_t *lenp, loff_t *ppos) 2928 { 2929 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2930 do_proc_dointvec_ms_jiffies_conv, NULL); 2931 } 2932 2933 static int proc_do_cad_pid(struct ctl_table *table, int write, 2934 void __user *buffer, size_t *lenp, loff_t *ppos) 2935 { 2936 struct pid *new_pid; 2937 pid_t tmp; 2938 int r; 2939 2940 tmp = pid_vnr(cad_pid); 2941 2942 r = __do_proc_dointvec(&tmp, table, write, buffer, 2943 lenp, ppos, NULL, NULL); 2944 if (r || !write) 2945 return r; 2946 2947 new_pid = find_get_pid(tmp); 2948 if (!new_pid) 2949 return -ESRCH; 2950 2951 put_pid(xchg(&cad_pid, new_pid)); 2952 return 0; 2953 } 2954 2955 /** 2956 * proc_do_large_bitmap - read/write from/to a large bitmap 2957 * @table: the sysctl table 2958 * @write: %TRUE if this is a write to the sysctl file 2959 * @buffer: the user buffer 2960 * @lenp: the size of the user buffer 2961 * @ppos: file position 2962 * 2963 * The bitmap is stored at table->data and the bitmap length (in bits) 2964 * in table->maxlen. 2965 * 2966 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2967 * large bitmaps may be represented in a compact manner. Writing into 2968 * the file will clear the bitmap then update it with the given input. 2969 * 2970 * Returns 0 on success. 2971 */ 2972 int proc_do_large_bitmap(struct ctl_table *table, int write, 2973 void __user *buffer, size_t *lenp, loff_t *ppos) 2974 { 2975 int err = 0; 2976 bool first = 1; 2977 size_t left = *lenp; 2978 unsigned long bitmap_len = table->maxlen; 2979 unsigned long *bitmap = *(unsigned long **) table->data; 2980 unsigned long *tmp_bitmap = NULL; 2981 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2982 2983 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2984 *lenp = 0; 2985 return 0; 2986 } 2987 2988 if (write) { 2989 char *kbuf, *p; 2990 2991 if (left > PAGE_SIZE - 1) 2992 left = PAGE_SIZE - 1; 2993 2994 p = kbuf = memdup_user_nul(buffer, left); 2995 if (IS_ERR(kbuf)) 2996 return PTR_ERR(kbuf); 2997 2998 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 2999 GFP_KERNEL); 3000 if (!tmp_bitmap) { 3001 kfree(kbuf); 3002 return -ENOMEM; 3003 } 3004 proc_skip_char(&p, &left, '\n'); 3005 while (!err && left) { 3006 unsigned long val_a, val_b; 3007 bool neg; 3008 3009 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3010 sizeof(tr_a), &c); 3011 if (err) 3012 break; 3013 if (val_a >= bitmap_len || neg) { 3014 err = -EINVAL; 3015 break; 3016 } 3017 3018 val_b = val_a; 3019 if (left) { 3020 p++; 3021 left--; 3022 } 3023 3024 if (c == '-') { 3025 err = proc_get_long(&p, &left, &val_b, 3026 &neg, tr_b, sizeof(tr_b), 3027 &c); 3028 if (err) 3029 break; 3030 if (val_b >= bitmap_len || neg || 3031 val_a > val_b) { 3032 err = -EINVAL; 3033 break; 3034 } 3035 if (left) { 3036 p++; 3037 left--; 3038 } 3039 } 3040 3041 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3042 first = 0; 3043 proc_skip_char(&p, &left, '\n'); 3044 } 3045 kfree(kbuf); 3046 } else { 3047 unsigned long bit_a, bit_b = 0; 3048 3049 while (left) { 3050 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3051 if (bit_a >= bitmap_len) 3052 break; 3053 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3054 bit_a + 1) - 1; 3055 3056 if (!first) { 3057 err = proc_put_char(&buffer, &left, ','); 3058 if (err) 3059 break; 3060 } 3061 err = proc_put_long(&buffer, &left, bit_a, false); 3062 if (err) 3063 break; 3064 if (bit_a != bit_b) { 3065 err = proc_put_char(&buffer, &left, '-'); 3066 if (err) 3067 break; 3068 err = proc_put_long(&buffer, &left, bit_b, false); 3069 if (err) 3070 break; 3071 } 3072 3073 first = 0; bit_b++; 3074 } 3075 if (!err) 3076 err = proc_put_char(&buffer, &left, '\n'); 3077 } 3078 3079 if (!err) { 3080 if (write) { 3081 if (*ppos) 3082 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3083 else 3084 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3085 } 3086 kfree(tmp_bitmap); 3087 *lenp -= left; 3088 *ppos += *lenp; 3089 return 0; 3090 } else { 3091 kfree(tmp_bitmap); 3092 return err; 3093 } 3094 } 3095 3096 #else /* CONFIG_PROC_SYSCTL */ 3097 3098 int proc_dostring(struct ctl_table *table, int write, 3099 void __user *buffer, size_t *lenp, loff_t *ppos) 3100 { 3101 return -ENOSYS; 3102 } 3103 3104 int proc_dointvec(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_douintvec(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_dointvec_minmax(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_douintvec_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_dointvec_jiffies(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_userhz_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_ms_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_doulongvec_minmax(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_ms_jiffies_minmax(struct ctl_table *table, int write, 3153 void __user *buffer, 3154 size_t *lenp, loff_t *ppos) 3155 { 3156 return -ENOSYS; 3157 } 3158 3159 3160 #endif /* CONFIG_PROC_SYSCTL */ 3161 3162 /* 3163 * No sense putting this after each symbol definition, twice, 3164 * exception granted :-) 3165 */ 3166 EXPORT_SYMBOL(proc_dointvec); 3167 EXPORT_SYMBOL(proc_douintvec); 3168 EXPORT_SYMBOL(proc_dointvec_jiffies); 3169 EXPORT_SYMBOL(proc_dointvec_minmax); 3170 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3171 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3172 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3173 EXPORT_SYMBOL(proc_dostring); 3174 EXPORT_SYMBOL(proc_doulongvec_minmax); 3175 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3176