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_minmax, 371 .extra1 = &one, 372 }, 373 #ifdef CONFIG_SCHEDSTATS 374 { 375 .procname = "sched_schedstats", 376 .data = NULL, 377 .maxlen = sizeof(unsigned int), 378 .mode = 0644, 379 .proc_handler = sysctl_schedstats, 380 .extra1 = &zero, 381 .extra2 = &one, 382 }, 383 #endif /* CONFIG_SCHEDSTATS */ 384 #endif /* CONFIG_SMP */ 385 #ifdef CONFIG_NUMA_BALANCING 386 { 387 .procname = "numa_balancing_scan_delay_ms", 388 .data = &sysctl_numa_balancing_scan_delay, 389 .maxlen = sizeof(unsigned int), 390 .mode = 0644, 391 .proc_handler = proc_dointvec, 392 }, 393 { 394 .procname = "numa_balancing_scan_period_min_ms", 395 .data = &sysctl_numa_balancing_scan_period_min, 396 .maxlen = sizeof(unsigned int), 397 .mode = 0644, 398 .proc_handler = proc_dointvec, 399 }, 400 { 401 .procname = "numa_balancing_scan_period_max_ms", 402 .data = &sysctl_numa_balancing_scan_period_max, 403 .maxlen = sizeof(unsigned int), 404 .mode = 0644, 405 .proc_handler = proc_dointvec, 406 }, 407 { 408 .procname = "numa_balancing_scan_size_mb", 409 .data = &sysctl_numa_balancing_scan_size, 410 .maxlen = sizeof(unsigned int), 411 .mode = 0644, 412 .proc_handler = proc_dointvec_minmax, 413 .extra1 = &one, 414 }, 415 { 416 .procname = "numa_balancing", 417 .data = NULL, /* filled in by handler */ 418 .maxlen = sizeof(unsigned int), 419 .mode = 0644, 420 .proc_handler = sysctl_numa_balancing, 421 .extra1 = &zero, 422 .extra2 = &one, 423 }, 424 #endif /* CONFIG_NUMA_BALANCING */ 425 #endif /* CONFIG_SCHED_DEBUG */ 426 { 427 .procname = "sched_rt_period_us", 428 .data = &sysctl_sched_rt_period, 429 .maxlen = sizeof(unsigned int), 430 .mode = 0644, 431 .proc_handler = sched_rt_handler, 432 }, 433 { 434 .procname = "sched_rt_runtime_us", 435 .data = &sysctl_sched_rt_runtime, 436 .maxlen = sizeof(int), 437 .mode = 0644, 438 .proc_handler = sched_rt_handler, 439 }, 440 { 441 .procname = "sched_rr_timeslice_ms", 442 .data = &sysctl_sched_rr_timeslice, 443 .maxlen = sizeof(int), 444 .mode = 0644, 445 .proc_handler = sched_rr_handler, 446 }, 447 #ifdef CONFIG_SCHED_AUTOGROUP 448 { 449 .procname = "sched_autogroup_enabled", 450 .data = &sysctl_sched_autogroup_enabled, 451 .maxlen = sizeof(unsigned int), 452 .mode = 0644, 453 .proc_handler = proc_dointvec_minmax, 454 .extra1 = &zero, 455 .extra2 = &one, 456 }, 457 #endif 458 #ifdef CONFIG_CFS_BANDWIDTH 459 { 460 .procname = "sched_cfs_bandwidth_slice_us", 461 .data = &sysctl_sched_cfs_bandwidth_slice, 462 .maxlen = sizeof(unsigned int), 463 .mode = 0644, 464 .proc_handler = proc_dointvec_minmax, 465 .extra1 = &one, 466 }, 467 #endif 468 #ifdef CONFIG_PROVE_LOCKING 469 { 470 .procname = "prove_locking", 471 .data = &prove_locking, 472 .maxlen = sizeof(int), 473 .mode = 0644, 474 .proc_handler = proc_dointvec, 475 }, 476 #endif 477 #ifdef CONFIG_LOCK_STAT 478 { 479 .procname = "lock_stat", 480 .data = &lock_stat, 481 .maxlen = sizeof(int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec, 484 }, 485 #endif 486 { 487 .procname = "panic", 488 .data = &panic_timeout, 489 .maxlen = sizeof(int), 490 .mode = 0644, 491 .proc_handler = proc_dointvec, 492 }, 493 #ifdef CONFIG_COREDUMP 494 { 495 .procname = "core_uses_pid", 496 .data = &core_uses_pid, 497 .maxlen = sizeof(int), 498 .mode = 0644, 499 .proc_handler = proc_dointvec, 500 }, 501 { 502 .procname = "core_pattern", 503 .data = core_pattern, 504 .maxlen = CORENAME_MAX_SIZE, 505 .mode = 0644, 506 .proc_handler = proc_dostring_coredump, 507 }, 508 { 509 .procname = "core_pipe_limit", 510 .data = &core_pipe_limit, 511 .maxlen = sizeof(unsigned int), 512 .mode = 0644, 513 .proc_handler = proc_dointvec, 514 }, 515 #endif 516 #ifdef CONFIG_PROC_SYSCTL 517 { 518 .procname = "tainted", 519 .maxlen = sizeof(long), 520 .mode = 0644, 521 .proc_handler = proc_taint, 522 }, 523 { 524 .procname = "sysctl_writes_strict", 525 .data = &sysctl_writes_strict, 526 .maxlen = sizeof(int), 527 .mode = 0644, 528 .proc_handler = proc_dointvec_minmax, 529 .extra1 = &neg_one, 530 .extra2 = &one, 531 }, 532 #endif 533 #ifdef CONFIG_LATENCYTOP 534 { 535 .procname = "latencytop", 536 .data = &latencytop_enabled, 537 .maxlen = sizeof(int), 538 .mode = 0644, 539 .proc_handler = sysctl_latencytop, 540 }, 541 #endif 542 #ifdef CONFIG_BLK_DEV_INITRD 543 { 544 .procname = "real-root-dev", 545 .data = &real_root_dev, 546 .maxlen = sizeof(int), 547 .mode = 0644, 548 .proc_handler = proc_dointvec, 549 }, 550 #endif 551 { 552 .procname = "print-fatal-signals", 553 .data = &print_fatal_signals, 554 .maxlen = sizeof(int), 555 .mode = 0644, 556 .proc_handler = proc_dointvec, 557 }, 558 #ifdef CONFIG_SPARC 559 { 560 .procname = "reboot-cmd", 561 .data = reboot_command, 562 .maxlen = 256, 563 .mode = 0644, 564 .proc_handler = proc_dostring, 565 }, 566 { 567 .procname = "stop-a", 568 .data = &stop_a_enabled, 569 .maxlen = sizeof (int), 570 .mode = 0644, 571 .proc_handler = proc_dointvec, 572 }, 573 { 574 .procname = "scons-poweroff", 575 .data = &scons_pwroff, 576 .maxlen = sizeof (int), 577 .mode = 0644, 578 .proc_handler = proc_dointvec, 579 }, 580 #endif 581 #ifdef CONFIG_SPARC64 582 { 583 .procname = "tsb-ratio", 584 .data = &sysctl_tsb_ratio, 585 .maxlen = sizeof (int), 586 .mode = 0644, 587 .proc_handler = proc_dointvec, 588 }, 589 #endif 590 #ifdef __hppa__ 591 { 592 .procname = "soft-power", 593 .data = &pwrsw_enabled, 594 .maxlen = sizeof (int), 595 .mode = 0644, 596 .proc_handler = proc_dointvec, 597 }, 598 #endif 599 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW 600 { 601 .procname = "unaligned-trap", 602 .data = &unaligned_enabled, 603 .maxlen = sizeof (int), 604 .mode = 0644, 605 .proc_handler = proc_dointvec, 606 }, 607 #endif 608 { 609 .procname = "ctrl-alt-del", 610 .data = &C_A_D, 611 .maxlen = sizeof(int), 612 .mode = 0644, 613 .proc_handler = proc_dointvec, 614 }, 615 #ifdef CONFIG_FUNCTION_TRACER 616 { 617 .procname = "ftrace_enabled", 618 .data = &ftrace_enabled, 619 .maxlen = sizeof(int), 620 .mode = 0644, 621 .proc_handler = ftrace_enable_sysctl, 622 }, 623 #endif 624 #ifdef CONFIG_STACK_TRACER 625 { 626 .procname = "stack_tracer_enabled", 627 .data = &stack_tracer_enabled, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 .proc_handler = stack_trace_sysctl, 631 }, 632 #endif 633 #ifdef CONFIG_TRACING 634 { 635 .procname = "ftrace_dump_on_oops", 636 .data = &ftrace_dump_on_oops, 637 .maxlen = sizeof(int), 638 .mode = 0644, 639 .proc_handler = proc_dointvec, 640 }, 641 { 642 .procname = "traceoff_on_warning", 643 .data = &__disable_trace_on_warning, 644 .maxlen = sizeof(__disable_trace_on_warning), 645 .mode = 0644, 646 .proc_handler = proc_dointvec, 647 }, 648 { 649 .procname = "tracepoint_printk", 650 .data = &tracepoint_printk, 651 .maxlen = sizeof(tracepoint_printk), 652 .mode = 0644, 653 .proc_handler = tracepoint_printk_sysctl, 654 }, 655 #endif 656 #ifdef CONFIG_KEXEC_CORE 657 { 658 .procname = "kexec_load_disabled", 659 .data = &kexec_load_disabled, 660 .maxlen = sizeof(int), 661 .mode = 0644, 662 /* only handle a transition from default "0" to "1" */ 663 .proc_handler = proc_dointvec_minmax, 664 .extra1 = &one, 665 .extra2 = &one, 666 }, 667 #endif 668 #ifdef CONFIG_MODULES 669 { 670 .procname = "modprobe", 671 .data = &modprobe_path, 672 .maxlen = KMOD_PATH_LEN, 673 .mode = 0644, 674 .proc_handler = proc_dostring, 675 }, 676 { 677 .procname = "modules_disabled", 678 .data = &modules_disabled, 679 .maxlen = sizeof(int), 680 .mode = 0644, 681 /* only handle a transition from default "0" to "1" */ 682 .proc_handler = proc_dointvec_minmax, 683 .extra1 = &one, 684 .extra2 = &one, 685 }, 686 #endif 687 #ifdef CONFIG_UEVENT_HELPER 688 { 689 .procname = "hotplug", 690 .data = &uevent_helper, 691 .maxlen = UEVENT_HELPER_PATH_LEN, 692 .mode = 0644, 693 .proc_handler = proc_dostring, 694 }, 695 #endif 696 #ifdef CONFIG_CHR_DEV_SG 697 { 698 .procname = "sg-big-buff", 699 .data = &sg_big_buff, 700 .maxlen = sizeof (int), 701 .mode = 0444, 702 .proc_handler = proc_dointvec, 703 }, 704 #endif 705 #ifdef CONFIG_BSD_PROCESS_ACCT 706 { 707 .procname = "acct", 708 .data = &acct_parm, 709 .maxlen = 3*sizeof(int), 710 .mode = 0644, 711 .proc_handler = proc_dointvec, 712 }, 713 #endif 714 #ifdef CONFIG_MAGIC_SYSRQ 715 { 716 .procname = "sysrq", 717 .data = &__sysrq_enabled, 718 .maxlen = sizeof (int), 719 .mode = 0644, 720 .proc_handler = sysrq_sysctl_handler, 721 }, 722 #endif 723 #ifdef CONFIG_PROC_SYSCTL 724 { 725 .procname = "cad_pid", 726 .data = NULL, 727 .maxlen = sizeof (int), 728 .mode = 0600, 729 .proc_handler = proc_do_cad_pid, 730 }, 731 #endif 732 { 733 .procname = "threads-max", 734 .data = NULL, 735 .maxlen = sizeof(int), 736 .mode = 0644, 737 .proc_handler = sysctl_max_threads, 738 }, 739 { 740 .procname = "random", 741 .mode = 0555, 742 .child = random_table, 743 }, 744 { 745 .procname = "usermodehelper", 746 .mode = 0555, 747 .child = usermodehelper_table, 748 }, 749 { 750 .procname = "overflowuid", 751 .data = &overflowuid, 752 .maxlen = sizeof(int), 753 .mode = 0644, 754 .proc_handler = proc_dointvec_minmax, 755 .extra1 = &minolduid, 756 .extra2 = &maxolduid, 757 }, 758 { 759 .procname = "overflowgid", 760 .data = &overflowgid, 761 .maxlen = sizeof(int), 762 .mode = 0644, 763 .proc_handler = proc_dointvec_minmax, 764 .extra1 = &minolduid, 765 .extra2 = &maxolduid, 766 }, 767 #ifdef CONFIG_S390 768 #ifdef CONFIG_MATHEMU 769 { 770 .procname = "ieee_emulation_warnings", 771 .data = &sysctl_ieee_emulation_warnings, 772 .maxlen = sizeof(int), 773 .mode = 0644, 774 .proc_handler = proc_dointvec, 775 }, 776 #endif 777 { 778 .procname = "userprocess_debug", 779 .data = &show_unhandled_signals, 780 .maxlen = sizeof(int), 781 .mode = 0644, 782 .proc_handler = proc_dointvec, 783 }, 784 #endif 785 { 786 .procname = "pid_max", 787 .data = &pid_max, 788 .maxlen = sizeof (int), 789 .mode = 0644, 790 .proc_handler = proc_dointvec_minmax, 791 .extra1 = &pid_max_min, 792 .extra2 = &pid_max_max, 793 }, 794 { 795 .procname = "panic_on_oops", 796 .data = &panic_on_oops, 797 .maxlen = sizeof(int), 798 .mode = 0644, 799 .proc_handler = proc_dointvec, 800 }, 801 #if defined CONFIG_PRINTK 802 { 803 .procname = "printk", 804 .data = &console_loglevel, 805 .maxlen = 4*sizeof(int), 806 .mode = 0644, 807 .proc_handler = proc_dointvec, 808 }, 809 { 810 .procname = "printk_ratelimit", 811 .data = &printk_ratelimit_state.interval, 812 .maxlen = sizeof(int), 813 .mode = 0644, 814 .proc_handler = proc_dointvec_jiffies, 815 }, 816 { 817 .procname = "printk_ratelimit_burst", 818 .data = &printk_ratelimit_state.burst, 819 .maxlen = sizeof(int), 820 .mode = 0644, 821 .proc_handler = proc_dointvec, 822 }, 823 { 824 .procname = "printk_delay", 825 .data = &printk_delay_msec, 826 .maxlen = sizeof(int), 827 .mode = 0644, 828 .proc_handler = proc_dointvec_minmax, 829 .extra1 = &zero, 830 .extra2 = &ten_thousand, 831 }, 832 { 833 .procname = "printk_devkmsg", 834 .data = devkmsg_log_str, 835 .maxlen = DEVKMSG_STR_MAX_SIZE, 836 .mode = 0644, 837 .proc_handler = devkmsg_sysctl_set_loglvl, 838 }, 839 { 840 .procname = "dmesg_restrict", 841 .data = &dmesg_restrict, 842 .maxlen = sizeof(int), 843 .mode = 0644, 844 .proc_handler = proc_dointvec_minmax_sysadmin, 845 .extra1 = &zero, 846 .extra2 = &one, 847 }, 848 { 849 .procname = "kptr_restrict", 850 .data = &kptr_restrict, 851 .maxlen = sizeof(int), 852 .mode = 0644, 853 .proc_handler = proc_dointvec_minmax_sysadmin, 854 .extra1 = &zero, 855 .extra2 = &two, 856 }, 857 #endif 858 { 859 .procname = "ngroups_max", 860 .data = &ngroups_max, 861 .maxlen = sizeof (int), 862 .mode = 0444, 863 .proc_handler = proc_dointvec, 864 }, 865 { 866 .procname = "cap_last_cap", 867 .data = (void *)&cap_last_cap, 868 .maxlen = sizeof(int), 869 .mode = 0444, 870 .proc_handler = proc_dointvec, 871 }, 872 #if defined(CONFIG_LOCKUP_DETECTOR) 873 { 874 .procname = "watchdog", 875 .data = &watchdog_user_enabled, 876 .maxlen = sizeof (int), 877 .mode = 0644, 878 .proc_handler = proc_watchdog, 879 .extra1 = &zero, 880 .extra2 = &one, 881 }, 882 { 883 .procname = "watchdog_thresh", 884 .data = &watchdog_thresh, 885 .maxlen = sizeof(int), 886 .mode = 0644, 887 .proc_handler = proc_watchdog_thresh, 888 .extra1 = &zero, 889 .extra2 = &sixty, 890 }, 891 { 892 .procname = "nmi_watchdog", 893 .data = &nmi_watchdog_enabled, 894 .maxlen = sizeof (int), 895 .mode = 0644, 896 .proc_handler = proc_nmi_watchdog, 897 .extra1 = &zero, 898 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR) 899 .extra2 = &one, 900 #else 901 .extra2 = &zero, 902 #endif 903 }, 904 { 905 .procname = "watchdog_cpumask", 906 .data = &watchdog_cpumask_bits, 907 .maxlen = NR_CPUS, 908 .mode = 0644, 909 .proc_handler = proc_watchdog_cpumask, 910 }, 911 #ifdef CONFIG_SOFTLOCKUP_DETECTOR 912 { 913 .procname = "soft_watchdog", 914 .data = &soft_watchdog_enabled, 915 .maxlen = sizeof (int), 916 .mode = 0644, 917 .proc_handler = proc_soft_watchdog, 918 .extra1 = &zero, 919 .extra2 = &one, 920 }, 921 { 922 .procname = "softlockup_panic", 923 .data = &softlockup_panic, 924 .maxlen = sizeof(int), 925 .mode = 0644, 926 .proc_handler = proc_dointvec_minmax, 927 .extra1 = &zero, 928 .extra2 = &one, 929 }, 930 #ifdef CONFIG_SMP 931 { 932 .procname = "softlockup_all_cpu_backtrace", 933 .data = &sysctl_softlockup_all_cpu_backtrace, 934 .maxlen = sizeof(int), 935 .mode = 0644, 936 .proc_handler = proc_dointvec_minmax, 937 .extra1 = &zero, 938 .extra2 = &one, 939 }, 940 #endif /* CONFIG_SMP */ 941 #endif 942 #ifdef CONFIG_HARDLOCKUP_DETECTOR 943 { 944 .procname = "hardlockup_panic", 945 .data = &hardlockup_panic, 946 .maxlen = sizeof(int), 947 .mode = 0644, 948 .proc_handler = proc_dointvec_minmax, 949 .extra1 = &zero, 950 .extra2 = &one, 951 }, 952 #ifdef CONFIG_SMP 953 { 954 .procname = "hardlockup_all_cpu_backtrace", 955 .data = &sysctl_hardlockup_all_cpu_backtrace, 956 .maxlen = sizeof(int), 957 .mode = 0644, 958 .proc_handler = proc_dointvec_minmax, 959 .extra1 = &zero, 960 .extra2 = &one, 961 }, 962 #endif /* CONFIG_SMP */ 963 #endif 964 #endif 965 966 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 967 { 968 .procname = "unknown_nmi_panic", 969 .data = &unknown_nmi_panic, 970 .maxlen = sizeof (int), 971 .mode = 0644, 972 .proc_handler = proc_dointvec, 973 }, 974 #endif 975 #if defined(CONFIG_X86) 976 { 977 .procname = "panic_on_unrecovered_nmi", 978 .data = &panic_on_unrecovered_nmi, 979 .maxlen = sizeof(int), 980 .mode = 0644, 981 .proc_handler = proc_dointvec, 982 }, 983 { 984 .procname = "panic_on_io_nmi", 985 .data = &panic_on_io_nmi, 986 .maxlen = sizeof(int), 987 .mode = 0644, 988 .proc_handler = proc_dointvec, 989 }, 990 #ifdef CONFIG_DEBUG_STACKOVERFLOW 991 { 992 .procname = "panic_on_stackoverflow", 993 .data = &sysctl_panic_on_stackoverflow, 994 .maxlen = sizeof(int), 995 .mode = 0644, 996 .proc_handler = proc_dointvec, 997 }, 998 #endif 999 { 1000 .procname = "bootloader_type", 1001 .data = &bootloader_type, 1002 .maxlen = sizeof (int), 1003 .mode = 0444, 1004 .proc_handler = proc_dointvec, 1005 }, 1006 { 1007 .procname = "bootloader_version", 1008 .data = &bootloader_version, 1009 .maxlen = sizeof (int), 1010 .mode = 0444, 1011 .proc_handler = proc_dointvec, 1012 }, 1013 { 1014 .procname = "io_delay_type", 1015 .data = &io_delay_type, 1016 .maxlen = sizeof(int), 1017 .mode = 0644, 1018 .proc_handler = proc_dointvec, 1019 }, 1020 #endif 1021 #if defined(CONFIG_MMU) 1022 { 1023 .procname = "randomize_va_space", 1024 .data = &randomize_va_space, 1025 .maxlen = sizeof(int), 1026 .mode = 0644, 1027 .proc_handler = proc_dointvec, 1028 }, 1029 #endif 1030 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 1031 { 1032 .procname = "spin_retry", 1033 .data = &spin_retry, 1034 .maxlen = sizeof (int), 1035 .mode = 0644, 1036 .proc_handler = proc_dointvec, 1037 }, 1038 #endif 1039 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86) 1040 { 1041 .procname = "acpi_video_flags", 1042 .data = &acpi_realmode_flags, 1043 .maxlen = sizeof (unsigned long), 1044 .mode = 0644, 1045 .proc_handler = proc_doulongvec_minmax, 1046 }, 1047 #endif 1048 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN 1049 { 1050 .procname = "ignore-unaligned-usertrap", 1051 .data = &no_unaligned_warning, 1052 .maxlen = sizeof (int), 1053 .mode = 0644, 1054 .proc_handler = proc_dointvec, 1055 }, 1056 #endif 1057 #ifdef CONFIG_IA64 1058 { 1059 .procname = "unaligned-dump-stack", 1060 .data = &unaligned_dump_stack, 1061 .maxlen = sizeof (int), 1062 .mode = 0644, 1063 .proc_handler = proc_dointvec, 1064 }, 1065 #endif 1066 #ifdef CONFIG_DETECT_HUNG_TASK 1067 { 1068 .procname = "hung_task_panic", 1069 .data = &sysctl_hung_task_panic, 1070 .maxlen = sizeof(int), 1071 .mode = 0644, 1072 .proc_handler = proc_dointvec_minmax, 1073 .extra1 = &zero, 1074 .extra2 = &one, 1075 }, 1076 { 1077 .procname = "hung_task_check_count", 1078 .data = &sysctl_hung_task_check_count, 1079 .maxlen = sizeof(int), 1080 .mode = 0644, 1081 .proc_handler = proc_dointvec_minmax, 1082 .extra1 = &zero, 1083 }, 1084 { 1085 .procname = "hung_task_timeout_secs", 1086 .data = &sysctl_hung_task_timeout_secs, 1087 .maxlen = sizeof(unsigned long), 1088 .mode = 0644, 1089 .proc_handler = proc_dohung_task_timeout_secs, 1090 .extra2 = &hung_task_timeout_max, 1091 }, 1092 { 1093 .procname = "hung_task_warnings", 1094 .data = &sysctl_hung_task_warnings, 1095 .maxlen = sizeof(int), 1096 .mode = 0644, 1097 .proc_handler = proc_dointvec_minmax, 1098 .extra1 = &neg_one, 1099 }, 1100 #endif 1101 #ifdef CONFIG_RT_MUTEXES 1102 { 1103 .procname = "max_lock_depth", 1104 .data = &max_lock_depth, 1105 .maxlen = sizeof(int), 1106 .mode = 0644, 1107 .proc_handler = proc_dointvec, 1108 }, 1109 #endif 1110 { 1111 .procname = "poweroff_cmd", 1112 .data = &poweroff_cmd, 1113 .maxlen = POWEROFF_CMD_PATH_LEN, 1114 .mode = 0644, 1115 .proc_handler = proc_dostring, 1116 }, 1117 #ifdef CONFIG_KEYS 1118 { 1119 .procname = "keys", 1120 .mode = 0555, 1121 .child = key_sysctls, 1122 }, 1123 #endif 1124 #ifdef CONFIG_PERF_EVENTS 1125 /* 1126 * User-space scripts rely on the existence of this file 1127 * as a feature check for perf_events being enabled. 1128 * 1129 * So it's an ABI, do not remove! 1130 */ 1131 { 1132 .procname = "perf_event_paranoid", 1133 .data = &sysctl_perf_event_paranoid, 1134 .maxlen = sizeof(sysctl_perf_event_paranoid), 1135 .mode = 0644, 1136 .proc_handler = proc_dointvec, 1137 }, 1138 { 1139 .procname = "perf_event_mlock_kb", 1140 .data = &sysctl_perf_event_mlock, 1141 .maxlen = sizeof(sysctl_perf_event_mlock), 1142 .mode = 0644, 1143 .proc_handler = proc_dointvec, 1144 }, 1145 { 1146 .procname = "perf_event_max_sample_rate", 1147 .data = &sysctl_perf_event_sample_rate, 1148 .maxlen = sizeof(sysctl_perf_event_sample_rate), 1149 .mode = 0644, 1150 .proc_handler = perf_proc_update_handler, 1151 .extra1 = &one, 1152 }, 1153 { 1154 .procname = "perf_cpu_time_max_percent", 1155 .data = &sysctl_perf_cpu_time_max_percent, 1156 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent), 1157 .mode = 0644, 1158 .proc_handler = perf_cpu_time_max_percent_handler, 1159 .extra1 = &zero, 1160 .extra2 = &one_hundred, 1161 }, 1162 { 1163 .procname = "perf_event_max_stack", 1164 .data = &sysctl_perf_event_max_stack, 1165 .maxlen = sizeof(sysctl_perf_event_max_stack), 1166 .mode = 0644, 1167 .proc_handler = perf_event_max_stack_handler, 1168 .extra1 = &zero, 1169 .extra2 = &six_hundred_forty_kb, 1170 }, 1171 { 1172 .procname = "perf_event_max_contexts_per_stack", 1173 .data = &sysctl_perf_event_max_contexts_per_stack, 1174 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack), 1175 .mode = 0644, 1176 .proc_handler = perf_event_max_stack_handler, 1177 .extra1 = &zero, 1178 .extra2 = &one_thousand, 1179 }, 1180 #endif 1181 #ifdef CONFIG_KMEMCHECK 1182 { 1183 .procname = "kmemcheck", 1184 .data = &kmemcheck_enabled, 1185 .maxlen = sizeof(int), 1186 .mode = 0644, 1187 .proc_handler = proc_dointvec, 1188 }, 1189 #endif 1190 { 1191 .procname = "panic_on_warn", 1192 .data = &panic_on_warn, 1193 .maxlen = sizeof(int), 1194 .mode = 0644, 1195 .proc_handler = proc_dointvec_minmax, 1196 .extra1 = &zero, 1197 .extra2 = &one, 1198 }, 1199 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 1200 { 1201 .procname = "timer_migration", 1202 .data = &sysctl_timer_migration, 1203 .maxlen = sizeof(unsigned int), 1204 .mode = 0644, 1205 .proc_handler = timer_migration_handler, 1206 .extra1 = &zero, 1207 .extra2 = &one, 1208 }, 1209 #endif 1210 #ifdef CONFIG_BPF_SYSCALL 1211 { 1212 .procname = "unprivileged_bpf_disabled", 1213 .data = &sysctl_unprivileged_bpf_disabled, 1214 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), 1215 .mode = 0644, 1216 /* only handle a transition from default "0" to "1" */ 1217 .proc_handler = proc_dointvec_minmax, 1218 .extra1 = &one, 1219 .extra2 = &one, 1220 }, 1221 #endif 1222 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) 1223 { 1224 .procname = "panic_on_rcu_stall", 1225 .data = &sysctl_panic_on_rcu_stall, 1226 .maxlen = sizeof(sysctl_panic_on_rcu_stall), 1227 .mode = 0644, 1228 .proc_handler = proc_dointvec_minmax, 1229 .extra1 = &zero, 1230 .extra2 = &one, 1231 }, 1232 #endif 1233 { } 1234 }; 1235 1236 static struct ctl_table vm_table[] = { 1237 { 1238 .procname = "overcommit_memory", 1239 .data = &sysctl_overcommit_memory, 1240 .maxlen = sizeof(sysctl_overcommit_memory), 1241 .mode = 0644, 1242 .proc_handler = proc_dointvec_minmax, 1243 .extra1 = &zero, 1244 .extra2 = &two, 1245 }, 1246 { 1247 .procname = "panic_on_oom", 1248 .data = &sysctl_panic_on_oom, 1249 .maxlen = sizeof(sysctl_panic_on_oom), 1250 .mode = 0644, 1251 .proc_handler = proc_dointvec_minmax, 1252 .extra1 = &zero, 1253 .extra2 = &two, 1254 }, 1255 { 1256 .procname = "oom_kill_allocating_task", 1257 .data = &sysctl_oom_kill_allocating_task, 1258 .maxlen = sizeof(sysctl_oom_kill_allocating_task), 1259 .mode = 0644, 1260 .proc_handler = proc_dointvec, 1261 }, 1262 { 1263 .procname = "oom_dump_tasks", 1264 .data = &sysctl_oom_dump_tasks, 1265 .maxlen = sizeof(sysctl_oom_dump_tasks), 1266 .mode = 0644, 1267 .proc_handler = proc_dointvec, 1268 }, 1269 { 1270 .procname = "overcommit_ratio", 1271 .data = &sysctl_overcommit_ratio, 1272 .maxlen = sizeof(sysctl_overcommit_ratio), 1273 .mode = 0644, 1274 .proc_handler = overcommit_ratio_handler, 1275 }, 1276 { 1277 .procname = "overcommit_kbytes", 1278 .data = &sysctl_overcommit_kbytes, 1279 .maxlen = sizeof(sysctl_overcommit_kbytes), 1280 .mode = 0644, 1281 .proc_handler = overcommit_kbytes_handler, 1282 }, 1283 { 1284 .procname = "page-cluster", 1285 .data = &page_cluster, 1286 .maxlen = sizeof(int), 1287 .mode = 0644, 1288 .proc_handler = proc_dointvec_minmax, 1289 .extra1 = &zero, 1290 }, 1291 { 1292 .procname = "dirty_background_ratio", 1293 .data = &dirty_background_ratio, 1294 .maxlen = sizeof(dirty_background_ratio), 1295 .mode = 0644, 1296 .proc_handler = dirty_background_ratio_handler, 1297 .extra1 = &zero, 1298 .extra2 = &one_hundred, 1299 }, 1300 { 1301 .procname = "dirty_background_bytes", 1302 .data = &dirty_background_bytes, 1303 .maxlen = sizeof(dirty_background_bytes), 1304 .mode = 0644, 1305 .proc_handler = dirty_background_bytes_handler, 1306 .extra1 = &one_ul, 1307 }, 1308 { 1309 .procname = "dirty_ratio", 1310 .data = &vm_dirty_ratio, 1311 .maxlen = sizeof(vm_dirty_ratio), 1312 .mode = 0644, 1313 .proc_handler = dirty_ratio_handler, 1314 .extra1 = &zero, 1315 .extra2 = &one_hundred, 1316 }, 1317 { 1318 .procname = "dirty_bytes", 1319 .data = &vm_dirty_bytes, 1320 .maxlen = sizeof(vm_dirty_bytes), 1321 .mode = 0644, 1322 .proc_handler = dirty_bytes_handler, 1323 .extra1 = &dirty_bytes_min, 1324 }, 1325 { 1326 .procname = "dirty_writeback_centisecs", 1327 .data = &dirty_writeback_interval, 1328 .maxlen = sizeof(dirty_writeback_interval), 1329 .mode = 0644, 1330 .proc_handler = dirty_writeback_centisecs_handler, 1331 }, 1332 { 1333 .procname = "dirty_expire_centisecs", 1334 .data = &dirty_expire_interval, 1335 .maxlen = sizeof(dirty_expire_interval), 1336 .mode = 0644, 1337 .proc_handler = proc_dointvec_minmax, 1338 .extra1 = &zero, 1339 }, 1340 { 1341 .procname = "dirtytime_expire_seconds", 1342 .data = &dirtytime_expire_interval, 1343 .maxlen = sizeof(dirty_expire_interval), 1344 .mode = 0644, 1345 .proc_handler = dirtytime_interval_handler, 1346 .extra1 = &zero, 1347 }, 1348 { 1349 .procname = "nr_pdflush_threads", 1350 .mode = 0444 /* read-only */, 1351 .proc_handler = pdflush_proc_obsolete, 1352 }, 1353 { 1354 .procname = "swappiness", 1355 .data = &vm_swappiness, 1356 .maxlen = sizeof(vm_swappiness), 1357 .mode = 0644, 1358 .proc_handler = proc_dointvec_minmax, 1359 .extra1 = &zero, 1360 .extra2 = &one_hundred, 1361 }, 1362 #ifdef CONFIG_HUGETLB_PAGE 1363 { 1364 .procname = "nr_hugepages", 1365 .data = NULL, 1366 .maxlen = sizeof(unsigned long), 1367 .mode = 0644, 1368 .proc_handler = hugetlb_sysctl_handler, 1369 }, 1370 #ifdef CONFIG_NUMA 1371 { 1372 .procname = "nr_hugepages_mempolicy", 1373 .data = NULL, 1374 .maxlen = sizeof(unsigned long), 1375 .mode = 0644, 1376 .proc_handler = &hugetlb_mempolicy_sysctl_handler, 1377 }, 1378 #endif 1379 { 1380 .procname = "hugetlb_shm_group", 1381 .data = &sysctl_hugetlb_shm_group, 1382 .maxlen = sizeof(gid_t), 1383 .mode = 0644, 1384 .proc_handler = proc_dointvec, 1385 }, 1386 { 1387 .procname = "hugepages_treat_as_movable", 1388 .data = &hugepages_treat_as_movable, 1389 .maxlen = sizeof(int), 1390 .mode = 0644, 1391 .proc_handler = proc_dointvec, 1392 }, 1393 { 1394 .procname = "nr_overcommit_hugepages", 1395 .data = NULL, 1396 .maxlen = sizeof(unsigned long), 1397 .mode = 0644, 1398 .proc_handler = hugetlb_overcommit_handler, 1399 }, 1400 #endif 1401 { 1402 .procname = "lowmem_reserve_ratio", 1403 .data = &sysctl_lowmem_reserve_ratio, 1404 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 1405 .mode = 0644, 1406 .proc_handler = lowmem_reserve_ratio_sysctl_handler, 1407 }, 1408 { 1409 .procname = "drop_caches", 1410 .data = &sysctl_drop_caches, 1411 .maxlen = sizeof(int), 1412 .mode = 0644, 1413 .proc_handler = drop_caches_sysctl_handler, 1414 .extra1 = &one, 1415 .extra2 = &four, 1416 }, 1417 #ifdef CONFIG_COMPACTION 1418 { 1419 .procname = "compact_memory", 1420 .data = &sysctl_compact_memory, 1421 .maxlen = sizeof(int), 1422 .mode = 0200, 1423 .proc_handler = sysctl_compaction_handler, 1424 }, 1425 { 1426 .procname = "extfrag_threshold", 1427 .data = &sysctl_extfrag_threshold, 1428 .maxlen = sizeof(int), 1429 .mode = 0644, 1430 .proc_handler = sysctl_extfrag_handler, 1431 .extra1 = &min_extfrag_threshold, 1432 .extra2 = &max_extfrag_threshold, 1433 }, 1434 { 1435 .procname = "compact_unevictable_allowed", 1436 .data = &sysctl_compact_unevictable_allowed, 1437 .maxlen = sizeof(int), 1438 .mode = 0644, 1439 .proc_handler = proc_dointvec, 1440 .extra1 = &zero, 1441 .extra2 = &one, 1442 }, 1443 1444 #endif /* CONFIG_COMPACTION */ 1445 { 1446 .procname = "min_free_kbytes", 1447 .data = &min_free_kbytes, 1448 .maxlen = sizeof(min_free_kbytes), 1449 .mode = 0644, 1450 .proc_handler = min_free_kbytes_sysctl_handler, 1451 .extra1 = &zero, 1452 }, 1453 { 1454 .procname = "watermark_scale_factor", 1455 .data = &watermark_scale_factor, 1456 .maxlen = sizeof(watermark_scale_factor), 1457 .mode = 0644, 1458 .proc_handler = watermark_scale_factor_sysctl_handler, 1459 .extra1 = &one, 1460 .extra2 = &one_thousand, 1461 }, 1462 { 1463 .procname = "percpu_pagelist_fraction", 1464 .data = &percpu_pagelist_fraction, 1465 .maxlen = sizeof(percpu_pagelist_fraction), 1466 .mode = 0644, 1467 .proc_handler = percpu_pagelist_fraction_sysctl_handler, 1468 .extra1 = &zero, 1469 }, 1470 #ifdef CONFIG_MMU 1471 { 1472 .procname = "max_map_count", 1473 .data = &sysctl_max_map_count, 1474 .maxlen = sizeof(sysctl_max_map_count), 1475 .mode = 0644, 1476 .proc_handler = proc_dointvec_minmax, 1477 .extra1 = &zero, 1478 }, 1479 #else 1480 { 1481 .procname = "nr_trim_pages", 1482 .data = &sysctl_nr_trim_pages, 1483 .maxlen = sizeof(sysctl_nr_trim_pages), 1484 .mode = 0644, 1485 .proc_handler = proc_dointvec_minmax, 1486 .extra1 = &zero, 1487 }, 1488 #endif 1489 { 1490 .procname = "laptop_mode", 1491 .data = &laptop_mode, 1492 .maxlen = sizeof(laptop_mode), 1493 .mode = 0644, 1494 .proc_handler = proc_dointvec_jiffies, 1495 }, 1496 { 1497 .procname = "block_dump", 1498 .data = &block_dump, 1499 .maxlen = sizeof(block_dump), 1500 .mode = 0644, 1501 .proc_handler = proc_dointvec, 1502 .extra1 = &zero, 1503 }, 1504 { 1505 .procname = "vfs_cache_pressure", 1506 .data = &sysctl_vfs_cache_pressure, 1507 .maxlen = sizeof(sysctl_vfs_cache_pressure), 1508 .mode = 0644, 1509 .proc_handler = proc_dointvec, 1510 .extra1 = &zero, 1511 }, 1512 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 1513 { 1514 .procname = "legacy_va_layout", 1515 .data = &sysctl_legacy_va_layout, 1516 .maxlen = sizeof(sysctl_legacy_va_layout), 1517 .mode = 0644, 1518 .proc_handler = proc_dointvec, 1519 .extra1 = &zero, 1520 }, 1521 #endif 1522 #ifdef CONFIG_NUMA 1523 { 1524 .procname = "zone_reclaim_mode", 1525 .data = &node_reclaim_mode, 1526 .maxlen = sizeof(node_reclaim_mode), 1527 .mode = 0644, 1528 .proc_handler = proc_dointvec, 1529 .extra1 = &zero, 1530 }, 1531 { 1532 .procname = "min_unmapped_ratio", 1533 .data = &sysctl_min_unmapped_ratio, 1534 .maxlen = sizeof(sysctl_min_unmapped_ratio), 1535 .mode = 0644, 1536 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler, 1537 .extra1 = &zero, 1538 .extra2 = &one_hundred, 1539 }, 1540 { 1541 .procname = "min_slab_ratio", 1542 .data = &sysctl_min_slab_ratio, 1543 .maxlen = sizeof(sysctl_min_slab_ratio), 1544 .mode = 0644, 1545 .proc_handler = sysctl_min_slab_ratio_sysctl_handler, 1546 .extra1 = &zero, 1547 .extra2 = &one_hundred, 1548 }, 1549 #endif 1550 #ifdef CONFIG_SMP 1551 { 1552 .procname = "stat_interval", 1553 .data = &sysctl_stat_interval, 1554 .maxlen = sizeof(sysctl_stat_interval), 1555 .mode = 0644, 1556 .proc_handler = proc_dointvec_jiffies, 1557 }, 1558 { 1559 .procname = "stat_refresh", 1560 .data = NULL, 1561 .maxlen = 0, 1562 .mode = 0600, 1563 .proc_handler = vmstat_refresh, 1564 }, 1565 #endif 1566 #ifdef CONFIG_MMU 1567 { 1568 .procname = "mmap_min_addr", 1569 .data = &dac_mmap_min_addr, 1570 .maxlen = sizeof(unsigned long), 1571 .mode = 0644, 1572 .proc_handler = mmap_min_addr_handler, 1573 }, 1574 #endif 1575 #ifdef CONFIG_NUMA 1576 { 1577 .procname = "numa_zonelist_order", 1578 .data = &numa_zonelist_order, 1579 .maxlen = NUMA_ZONELIST_ORDER_LEN, 1580 .mode = 0644, 1581 .proc_handler = numa_zonelist_order_handler, 1582 }, 1583 #endif 1584 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \ 1585 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL)) 1586 { 1587 .procname = "vdso_enabled", 1588 #ifdef CONFIG_X86_32 1589 .data = &vdso32_enabled, 1590 .maxlen = sizeof(vdso32_enabled), 1591 #else 1592 .data = &vdso_enabled, 1593 .maxlen = sizeof(vdso_enabled), 1594 #endif 1595 .mode = 0644, 1596 .proc_handler = proc_dointvec, 1597 .extra1 = &zero, 1598 }, 1599 #endif 1600 #ifdef CONFIG_HIGHMEM 1601 { 1602 .procname = "highmem_is_dirtyable", 1603 .data = &vm_highmem_is_dirtyable, 1604 .maxlen = sizeof(vm_highmem_is_dirtyable), 1605 .mode = 0644, 1606 .proc_handler = proc_dointvec_minmax, 1607 .extra1 = &zero, 1608 .extra2 = &one, 1609 }, 1610 #endif 1611 #ifdef CONFIG_MEMORY_FAILURE 1612 { 1613 .procname = "memory_failure_early_kill", 1614 .data = &sysctl_memory_failure_early_kill, 1615 .maxlen = sizeof(sysctl_memory_failure_early_kill), 1616 .mode = 0644, 1617 .proc_handler = proc_dointvec_minmax, 1618 .extra1 = &zero, 1619 .extra2 = &one, 1620 }, 1621 { 1622 .procname = "memory_failure_recovery", 1623 .data = &sysctl_memory_failure_recovery, 1624 .maxlen = sizeof(sysctl_memory_failure_recovery), 1625 .mode = 0644, 1626 .proc_handler = proc_dointvec_minmax, 1627 .extra1 = &zero, 1628 .extra2 = &one, 1629 }, 1630 #endif 1631 { 1632 .procname = "user_reserve_kbytes", 1633 .data = &sysctl_user_reserve_kbytes, 1634 .maxlen = sizeof(sysctl_user_reserve_kbytes), 1635 .mode = 0644, 1636 .proc_handler = proc_doulongvec_minmax, 1637 }, 1638 { 1639 .procname = "admin_reserve_kbytes", 1640 .data = &sysctl_admin_reserve_kbytes, 1641 .maxlen = sizeof(sysctl_admin_reserve_kbytes), 1642 .mode = 0644, 1643 .proc_handler = proc_doulongvec_minmax, 1644 }, 1645 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS 1646 { 1647 .procname = "mmap_rnd_bits", 1648 .data = &mmap_rnd_bits, 1649 .maxlen = sizeof(mmap_rnd_bits), 1650 .mode = 0600, 1651 .proc_handler = proc_dointvec_minmax, 1652 .extra1 = (void *)&mmap_rnd_bits_min, 1653 .extra2 = (void *)&mmap_rnd_bits_max, 1654 }, 1655 #endif 1656 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS 1657 { 1658 .procname = "mmap_rnd_compat_bits", 1659 .data = &mmap_rnd_compat_bits, 1660 .maxlen = sizeof(mmap_rnd_compat_bits), 1661 .mode = 0600, 1662 .proc_handler = proc_dointvec_minmax, 1663 .extra1 = (void *)&mmap_rnd_compat_bits_min, 1664 .extra2 = (void *)&mmap_rnd_compat_bits_max, 1665 }, 1666 #endif 1667 { } 1668 }; 1669 1670 static struct ctl_table fs_table[] = { 1671 { 1672 .procname = "inode-nr", 1673 .data = &inodes_stat, 1674 .maxlen = 2*sizeof(long), 1675 .mode = 0444, 1676 .proc_handler = proc_nr_inodes, 1677 }, 1678 { 1679 .procname = "inode-state", 1680 .data = &inodes_stat, 1681 .maxlen = 7*sizeof(long), 1682 .mode = 0444, 1683 .proc_handler = proc_nr_inodes, 1684 }, 1685 { 1686 .procname = "file-nr", 1687 .data = &files_stat, 1688 .maxlen = sizeof(files_stat), 1689 .mode = 0444, 1690 .proc_handler = proc_nr_files, 1691 }, 1692 { 1693 .procname = "file-max", 1694 .data = &files_stat.max_files, 1695 .maxlen = sizeof(files_stat.max_files), 1696 .mode = 0644, 1697 .proc_handler = proc_doulongvec_minmax, 1698 }, 1699 { 1700 .procname = "nr_open", 1701 .data = &sysctl_nr_open, 1702 .maxlen = sizeof(unsigned int), 1703 .mode = 0644, 1704 .proc_handler = proc_dointvec_minmax, 1705 .extra1 = &sysctl_nr_open_min, 1706 .extra2 = &sysctl_nr_open_max, 1707 }, 1708 { 1709 .procname = "dentry-state", 1710 .data = &dentry_stat, 1711 .maxlen = 6*sizeof(long), 1712 .mode = 0444, 1713 .proc_handler = proc_nr_dentry, 1714 }, 1715 { 1716 .procname = "overflowuid", 1717 .data = &fs_overflowuid, 1718 .maxlen = sizeof(int), 1719 .mode = 0644, 1720 .proc_handler = proc_dointvec_minmax, 1721 .extra1 = &minolduid, 1722 .extra2 = &maxolduid, 1723 }, 1724 { 1725 .procname = "overflowgid", 1726 .data = &fs_overflowgid, 1727 .maxlen = sizeof(int), 1728 .mode = 0644, 1729 .proc_handler = proc_dointvec_minmax, 1730 .extra1 = &minolduid, 1731 .extra2 = &maxolduid, 1732 }, 1733 #ifdef CONFIG_FILE_LOCKING 1734 { 1735 .procname = "leases-enable", 1736 .data = &leases_enable, 1737 .maxlen = sizeof(int), 1738 .mode = 0644, 1739 .proc_handler = proc_dointvec, 1740 }, 1741 #endif 1742 #ifdef CONFIG_DNOTIFY 1743 { 1744 .procname = "dir-notify-enable", 1745 .data = &dir_notify_enable, 1746 .maxlen = sizeof(int), 1747 .mode = 0644, 1748 .proc_handler = proc_dointvec, 1749 }, 1750 #endif 1751 #ifdef CONFIG_MMU 1752 #ifdef CONFIG_FILE_LOCKING 1753 { 1754 .procname = "lease-break-time", 1755 .data = &lease_break_time, 1756 .maxlen = sizeof(int), 1757 .mode = 0644, 1758 .proc_handler = proc_dointvec, 1759 }, 1760 #endif 1761 #ifdef CONFIG_AIO 1762 { 1763 .procname = "aio-nr", 1764 .data = &aio_nr, 1765 .maxlen = sizeof(aio_nr), 1766 .mode = 0444, 1767 .proc_handler = proc_doulongvec_minmax, 1768 }, 1769 { 1770 .procname = "aio-max-nr", 1771 .data = &aio_max_nr, 1772 .maxlen = sizeof(aio_max_nr), 1773 .mode = 0644, 1774 .proc_handler = proc_doulongvec_minmax, 1775 }, 1776 #endif /* CONFIG_AIO */ 1777 #ifdef CONFIG_INOTIFY_USER 1778 { 1779 .procname = "inotify", 1780 .mode = 0555, 1781 .child = inotify_table, 1782 }, 1783 #endif 1784 #ifdef CONFIG_EPOLL 1785 { 1786 .procname = "epoll", 1787 .mode = 0555, 1788 .child = epoll_table, 1789 }, 1790 #endif 1791 #endif 1792 { 1793 .procname = "protected_symlinks", 1794 .data = &sysctl_protected_symlinks, 1795 .maxlen = sizeof(int), 1796 .mode = 0600, 1797 .proc_handler = proc_dointvec_minmax, 1798 .extra1 = &zero, 1799 .extra2 = &one, 1800 }, 1801 { 1802 .procname = "protected_hardlinks", 1803 .data = &sysctl_protected_hardlinks, 1804 .maxlen = sizeof(int), 1805 .mode = 0600, 1806 .proc_handler = proc_dointvec_minmax, 1807 .extra1 = &zero, 1808 .extra2 = &one, 1809 }, 1810 { 1811 .procname = "suid_dumpable", 1812 .data = &suid_dumpable, 1813 .maxlen = sizeof(int), 1814 .mode = 0644, 1815 .proc_handler = proc_dointvec_minmax_coredump, 1816 .extra1 = &zero, 1817 .extra2 = &two, 1818 }, 1819 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE) 1820 { 1821 .procname = "binfmt_misc", 1822 .mode = 0555, 1823 .child = sysctl_mount_point, 1824 }, 1825 #endif 1826 { 1827 .procname = "pipe-max-size", 1828 .data = &pipe_max_size, 1829 .maxlen = sizeof(int), 1830 .mode = 0644, 1831 .proc_handler = &pipe_proc_fn, 1832 .extra1 = &pipe_min_size, 1833 }, 1834 { 1835 .procname = "pipe-user-pages-hard", 1836 .data = &pipe_user_pages_hard, 1837 .maxlen = sizeof(pipe_user_pages_hard), 1838 .mode = 0644, 1839 .proc_handler = proc_doulongvec_minmax, 1840 }, 1841 { 1842 .procname = "pipe-user-pages-soft", 1843 .data = &pipe_user_pages_soft, 1844 .maxlen = sizeof(pipe_user_pages_soft), 1845 .mode = 0644, 1846 .proc_handler = proc_doulongvec_minmax, 1847 }, 1848 { 1849 .procname = "mount-max", 1850 .data = &sysctl_mount_max, 1851 .maxlen = sizeof(unsigned int), 1852 .mode = 0644, 1853 .proc_handler = proc_dointvec_minmax, 1854 .extra1 = &one, 1855 }, 1856 { } 1857 }; 1858 1859 static struct ctl_table debug_table[] = { 1860 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE 1861 { 1862 .procname = "exception-trace", 1863 .data = &show_unhandled_signals, 1864 .maxlen = sizeof(int), 1865 .mode = 0644, 1866 .proc_handler = proc_dointvec 1867 }, 1868 #endif 1869 #if defined(CONFIG_OPTPROBES) 1870 { 1871 .procname = "kprobes-optimization", 1872 .data = &sysctl_kprobes_optimization, 1873 .maxlen = sizeof(int), 1874 .mode = 0644, 1875 .proc_handler = proc_kprobes_optimization_handler, 1876 .extra1 = &zero, 1877 .extra2 = &one, 1878 }, 1879 #endif 1880 { } 1881 }; 1882 1883 static struct ctl_table dev_table[] = { 1884 { } 1885 }; 1886 1887 int __init sysctl_init(void) 1888 { 1889 struct ctl_table_header *hdr; 1890 1891 hdr = register_sysctl_table(sysctl_base_table); 1892 kmemleak_not_leak(hdr); 1893 return 0; 1894 } 1895 1896 #endif /* CONFIG_SYSCTL */ 1897 1898 /* 1899 * /proc/sys support 1900 */ 1901 1902 #ifdef CONFIG_PROC_SYSCTL 1903 1904 static int _proc_do_string(char *data, int maxlen, int write, 1905 char __user *buffer, 1906 size_t *lenp, loff_t *ppos) 1907 { 1908 size_t len; 1909 char __user *p; 1910 char c; 1911 1912 if (!data || !maxlen || !*lenp) { 1913 *lenp = 0; 1914 return 0; 1915 } 1916 1917 if (write) { 1918 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) { 1919 /* Only continue writes not past the end of buffer. */ 1920 len = strlen(data); 1921 if (len > maxlen - 1) 1922 len = maxlen - 1; 1923 1924 if (*ppos > len) 1925 return 0; 1926 len = *ppos; 1927 } else { 1928 /* Start writing from beginning of buffer. */ 1929 len = 0; 1930 } 1931 1932 *ppos += *lenp; 1933 p = buffer; 1934 while ((p - buffer) < *lenp && len < maxlen - 1) { 1935 if (get_user(c, p++)) 1936 return -EFAULT; 1937 if (c == 0 || c == '\n') 1938 break; 1939 data[len++] = c; 1940 } 1941 data[len] = 0; 1942 } else { 1943 len = strlen(data); 1944 if (len > maxlen) 1945 len = maxlen; 1946 1947 if (*ppos > len) { 1948 *lenp = 0; 1949 return 0; 1950 } 1951 1952 data += *ppos; 1953 len -= *ppos; 1954 1955 if (len > *lenp) 1956 len = *lenp; 1957 if (len) 1958 if (copy_to_user(buffer, data, len)) 1959 return -EFAULT; 1960 if (len < *lenp) { 1961 if (put_user('\n', buffer + len)) 1962 return -EFAULT; 1963 len++; 1964 } 1965 *lenp = len; 1966 *ppos += len; 1967 } 1968 return 0; 1969 } 1970 1971 static void warn_sysctl_write(struct ctl_table *table) 1972 { 1973 pr_warn_once("%s wrote to %s when file position was not 0!\n" 1974 "This will not be supported in the future. To silence this\n" 1975 "warning, set kernel.sysctl_writes_strict = -1\n", 1976 current->comm, table->procname); 1977 } 1978 1979 /** 1980 * proc_first_pos_non_zero_ignore - check if firs position is allowed 1981 * @ppos: file position 1982 * @table: the sysctl table 1983 * 1984 * Returns true if the first position is non-zero and the sysctl_writes_strict 1985 * mode indicates this is not allowed for numeric input types. String proc 1986 * hadlers can ignore the return value. 1987 */ 1988 static bool proc_first_pos_non_zero_ignore(loff_t *ppos, 1989 struct ctl_table *table) 1990 { 1991 if (!*ppos) 1992 return false; 1993 1994 switch (sysctl_writes_strict) { 1995 case SYSCTL_WRITES_STRICT: 1996 return true; 1997 case SYSCTL_WRITES_WARN: 1998 warn_sysctl_write(table); 1999 return false; 2000 default: 2001 return false; 2002 } 2003 } 2004 2005 /** 2006 * proc_dostring - read a string sysctl 2007 * @table: the sysctl table 2008 * @write: %TRUE if this is a write to the sysctl file 2009 * @buffer: the user buffer 2010 * @lenp: the size of the user buffer 2011 * @ppos: file position 2012 * 2013 * Reads/writes a string from/to the user buffer. If the kernel 2014 * buffer provided is not large enough to hold the string, the 2015 * string is truncated. The copied string is %NULL-terminated. 2016 * If the string is being read by the user process, it is copied 2017 * and a newline '\n' is added. It is truncated if the buffer is 2018 * not large enough. 2019 * 2020 * Returns 0 on success. 2021 */ 2022 int proc_dostring(struct ctl_table *table, int write, 2023 void __user *buffer, size_t *lenp, loff_t *ppos) 2024 { 2025 if (write) 2026 proc_first_pos_non_zero_ignore(ppos, table); 2027 2028 return _proc_do_string((char *)(table->data), table->maxlen, write, 2029 (char __user *)buffer, lenp, ppos); 2030 } 2031 2032 static size_t proc_skip_spaces(char **buf) 2033 { 2034 size_t ret; 2035 char *tmp = skip_spaces(*buf); 2036 ret = tmp - *buf; 2037 *buf = tmp; 2038 return ret; 2039 } 2040 2041 static void proc_skip_char(char **buf, size_t *size, const char v) 2042 { 2043 while (*size) { 2044 if (**buf != v) 2045 break; 2046 (*size)--; 2047 (*buf)++; 2048 } 2049 } 2050 2051 #define TMPBUFLEN 22 2052 /** 2053 * proc_get_long - reads an ASCII formatted integer from a user buffer 2054 * 2055 * @buf: a kernel buffer 2056 * @size: size of the kernel buffer 2057 * @val: this is where the number will be stored 2058 * @neg: set to %TRUE if number is negative 2059 * @perm_tr: a vector which contains the allowed trailers 2060 * @perm_tr_len: size of the perm_tr vector 2061 * @tr: pointer to store the trailer character 2062 * 2063 * In case of success %0 is returned and @buf and @size are updated with 2064 * the amount of bytes read. If @tr is non-NULL and a trailing 2065 * character exists (size is non-zero after returning from this 2066 * function), @tr is updated with the trailing character. 2067 */ 2068 static int proc_get_long(char **buf, size_t *size, 2069 unsigned long *val, bool *neg, 2070 const char *perm_tr, unsigned perm_tr_len, char *tr) 2071 { 2072 int len; 2073 char *p, tmp[TMPBUFLEN]; 2074 2075 if (!*size) 2076 return -EINVAL; 2077 2078 len = *size; 2079 if (len > TMPBUFLEN - 1) 2080 len = TMPBUFLEN - 1; 2081 2082 memcpy(tmp, *buf, len); 2083 2084 tmp[len] = 0; 2085 p = tmp; 2086 if (*p == '-' && *size > 1) { 2087 *neg = true; 2088 p++; 2089 } else 2090 *neg = false; 2091 if (!isdigit(*p)) 2092 return -EINVAL; 2093 2094 *val = simple_strtoul(p, &p, 0); 2095 2096 len = p - tmp; 2097 2098 /* We don't know if the next char is whitespace thus we may accept 2099 * invalid integers (e.g. 1234...a) or two integers instead of one 2100 * (e.g. 123...1). So lets not allow such large numbers. */ 2101 if (len == TMPBUFLEN - 1) 2102 return -EINVAL; 2103 2104 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len)) 2105 return -EINVAL; 2106 2107 if (tr && (len < *size)) 2108 *tr = *p; 2109 2110 *buf += len; 2111 *size -= len; 2112 2113 return 0; 2114 } 2115 2116 /** 2117 * proc_put_long - converts an integer to a decimal ASCII formatted string 2118 * 2119 * @buf: the user buffer 2120 * @size: the size of the user buffer 2121 * @val: the integer to be converted 2122 * @neg: sign of the number, %TRUE for negative 2123 * 2124 * In case of success %0 is returned and @buf and @size are updated with 2125 * the amount of bytes written. 2126 */ 2127 static int proc_put_long(void __user **buf, size_t *size, unsigned long val, 2128 bool neg) 2129 { 2130 int len; 2131 char tmp[TMPBUFLEN], *p = tmp; 2132 2133 sprintf(p, "%s%lu", neg ? "-" : "", val); 2134 len = strlen(tmp); 2135 if (len > *size) 2136 len = *size; 2137 if (copy_to_user(*buf, tmp, len)) 2138 return -EFAULT; 2139 *size -= len; 2140 *buf += len; 2141 return 0; 2142 } 2143 #undef TMPBUFLEN 2144 2145 static int proc_put_char(void __user **buf, size_t *size, char c) 2146 { 2147 if (*size) { 2148 char __user **buffer = (char __user **)buf; 2149 if (put_user(c, *buffer)) 2150 return -EFAULT; 2151 (*size)--, (*buffer)++; 2152 *buf = *buffer; 2153 } 2154 return 0; 2155 } 2156 2157 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp, 2158 int *valp, 2159 int write, void *data) 2160 { 2161 if (write) { 2162 if (*negp) { 2163 if (*lvalp > (unsigned long) INT_MAX + 1) 2164 return -EINVAL; 2165 *valp = -*lvalp; 2166 } else { 2167 if (*lvalp > (unsigned long) INT_MAX) 2168 return -EINVAL; 2169 *valp = *lvalp; 2170 } 2171 } else { 2172 int val = *valp; 2173 if (val < 0) { 2174 *negp = true; 2175 *lvalp = -(unsigned long)val; 2176 } else { 2177 *negp = false; 2178 *lvalp = (unsigned long)val; 2179 } 2180 } 2181 return 0; 2182 } 2183 2184 static int do_proc_douintvec_conv(unsigned long *lvalp, 2185 unsigned int *valp, 2186 int write, void *data) 2187 { 2188 if (write) { 2189 if (*lvalp > UINT_MAX) 2190 return -EINVAL; 2191 *valp = *lvalp; 2192 } else { 2193 unsigned int val = *valp; 2194 *lvalp = (unsigned long)val; 2195 } 2196 return 0; 2197 } 2198 2199 static const char proc_wspace_sep[] = { ' ', '\t', '\n' }; 2200 2201 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table, 2202 int write, void __user *buffer, 2203 size_t *lenp, loff_t *ppos, 2204 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2205 int write, void *data), 2206 void *data) 2207 { 2208 int *i, vleft, first = 1, err = 0; 2209 size_t left; 2210 char *kbuf = NULL, *p; 2211 2212 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2213 *lenp = 0; 2214 return 0; 2215 } 2216 2217 i = (int *) tbl_data; 2218 vleft = table->maxlen / sizeof(*i); 2219 left = *lenp; 2220 2221 if (!conv) 2222 conv = do_proc_dointvec_conv; 2223 2224 if (write) { 2225 if (proc_first_pos_non_zero_ignore(ppos, table)) 2226 goto out; 2227 2228 if (left > PAGE_SIZE - 1) 2229 left = PAGE_SIZE - 1; 2230 p = kbuf = memdup_user_nul(buffer, left); 2231 if (IS_ERR(kbuf)) 2232 return PTR_ERR(kbuf); 2233 } 2234 2235 for (; left && vleft--; i++, first=0) { 2236 unsigned long lval; 2237 bool neg; 2238 2239 if (write) { 2240 left -= proc_skip_spaces(&p); 2241 2242 if (!left) 2243 break; 2244 err = proc_get_long(&p, &left, &lval, &neg, 2245 proc_wspace_sep, 2246 sizeof(proc_wspace_sep), NULL); 2247 if (err) 2248 break; 2249 if (conv(&neg, &lval, i, 1, data)) { 2250 err = -EINVAL; 2251 break; 2252 } 2253 } else { 2254 if (conv(&neg, &lval, i, 0, data)) { 2255 err = -EINVAL; 2256 break; 2257 } 2258 if (!first) 2259 err = proc_put_char(&buffer, &left, '\t'); 2260 if (err) 2261 break; 2262 err = proc_put_long(&buffer, &left, lval, neg); 2263 if (err) 2264 break; 2265 } 2266 } 2267 2268 if (!write && !first && left && !err) 2269 err = proc_put_char(&buffer, &left, '\n'); 2270 if (write && !err && left) 2271 left -= proc_skip_spaces(&p); 2272 if (write) { 2273 kfree(kbuf); 2274 if (first) 2275 return err ? : -EINVAL; 2276 } 2277 *lenp -= left; 2278 out: 2279 *ppos += *lenp; 2280 return err; 2281 } 2282 2283 static int do_proc_dointvec(struct ctl_table *table, int write, 2284 void __user *buffer, size_t *lenp, loff_t *ppos, 2285 int (*conv)(bool *negp, unsigned long *lvalp, int *valp, 2286 int write, void *data), 2287 void *data) 2288 { 2289 return __do_proc_dointvec(table->data, table, write, 2290 buffer, lenp, ppos, conv, data); 2291 } 2292 2293 static int do_proc_douintvec_w(unsigned int *tbl_data, 2294 struct ctl_table *table, 2295 void __user *buffer, 2296 size_t *lenp, loff_t *ppos, 2297 int (*conv)(unsigned long *lvalp, 2298 unsigned int *valp, 2299 int write, void *data), 2300 void *data) 2301 { 2302 unsigned long lval; 2303 int err = 0; 2304 size_t left; 2305 bool neg; 2306 char *kbuf = NULL, *p; 2307 2308 left = *lenp; 2309 2310 if (proc_first_pos_non_zero_ignore(ppos, table)) 2311 goto bail_early; 2312 2313 if (left > PAGE_SIZE - 1) 2314 left = PAGE_SIZE - 1; 2315 2316 p = kbuf = memdup_user_nul(buffer, left); 2317 if (IS_ERR(kbuf)) 2318 return -EINVAL; 2319 2320 left -= proc_skip_spaces(&p); 2321 if (!left) { 2322 err = -EINVAL; 2323 goto out_free; 2324 } 2325 2326 err = proc_get_long(&p, &left, &lval, &neg, 2327 proc_wspace_sep, 2328 sizeof(proc_wspace_sep), NULL); 2329 if (err || neg) { 2330 err = -EINVAL; 2331 goto out_free; 2332 } 2333 2334 if (conv(&lval, tbl_data, 1, data)) { 2335 err = -EINVAL; 2336 goto out_free; 2337 } 2338 2339 if (!err && left) 2340 left -= proc_skip_spaces(&p); 2341 2342 out_free: 2343 kfree(kbuf); 2344 if (err) 2345 return -EINVAL; 2346 2347 return 0; 2348 2349 /* This is in keeping with old __do_proc_dointvec() */ 2350 bail_early: 2351 *ppos += *lenp; 2352 return err; 2353 } 2354 2355 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer, 2356 size_t *lenp, loff_t *ppos, 2357 int (*conv)(unsigned long *lvalp, 2358 unsigned int *valp, 2359 int write, void *data), 2360 void *data) 2361 { 2362 unsigned long lval; 2363 int err = 0; 2364 size_t left; 2365 2366 left = *lenp; 2367 2368 if (conv(&lval, tbl_data, 0, data)) { 2369 err = -EINVAL; 2370 goto out; 2371 } 2372 2373 err = proc_put_long(&buffer, &left, lval, false); 2374 if (err || !left) 2375 goto out; 2376 2377 err = proc_put_char(&buffer, &left, '\n'); 2378 2379 out: 2380 *lenp -= left; 2381 *ppos += *lenp; 2382 2383 return err; 2384 } 2385 2386 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table, 2387 int write, void __user *buffer, 2388 size_t *lenp, loff_t *ppos, 2389 int (*conv)(unsigned long *lvalp, 2390 unsigned int *valp, 2391 int write, void *data), 2392 void *data) 2393 { 2394 unsigned int *i, vleft; 2395 2396 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) { 2397 *lenp = 0; 2398 return 0; 2399 } 2400 2401 i = (unsigned int *) tbl_data; 2402 vleft = table->maxlen / sizeof(*i); 2403 2404 /* 2405 * Arrays are not supported, keep this simple. *Do not* add 2406 * support for them. 2407 */ 2408 if (vleft != 1) { 2409 *lenp = 0; 2410 return -EINVAL; 2411 } 2412 2413 if (!conv) 2414 conv = do_proc_douintvec_conv; 2415 2416 if (write) 2417 return do_proc_douintvec_w(i, table, buffer, lenp, ppos, 2418 conv, data); 2419 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data); 2420 } 2421 2422 static int do_proc_douintvec(struct ctl_table *table, int write, 2423 void __user *buffer, size_t *lenp, loff_t *ppos, 2424 int (*conv)(unsigned long *lvalp, 2425 unsigned int *valp, 2426 int write, void *data), 2427 void *data) 2428 { 2429 return __do_proc_douintvec(table->data, table, write, 2430 buffer, lenp, ppos, conv, data); 2431 } 2432 2433 /** 2434 * proc_dointvec - read a vector of integers 2435 * @table: the sysctl table 2436 * @write: %TRUE if this is a write to the sysctl file 2437 * @buffer: the user buffer 2438 * @lenp: the size of the user buffer 2439 * @ppos: file position 2440 * 2441 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2442 * values from/to the user buffer, treated as an ASCII string. 2443 * 2444 * Returns 0 on success. 2445 */ 2446 int proc_dointvec(struct ctl_table *table, int write, 2447 void __user *buffer, size_t *lenp, loff_t *ppos) 2448 { 2449 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL); 2450 } 2451 2452 /** 2453 * proc_douintvec - read a vector of unsigned integers 2454 * @table: the sysctl table 2455 * @write: %TRUE if this is a write to the sysctl file 2456 * @buffer: the user buffer 2457 * @lenp: the size of the user buffer 2458 * @ppos: file position 2459 * 2460 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2461 * values from/to the user buffer, treated as an ASCII string. 2462 * 2463 * Returns 0 on success. 2464 */ 2465 int proc_douintvec(struct ctl_table *table, int write, 2466 void __user *buffer, size_t *lenp, loff_t *ppos) 2467 { 2468 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2469 do_proc_douintvec_conv, NULL); 2470 } 2471 2472 /* 2473 * Taint values can only be increased 2474 * This means we can safely use a temporary. 2475 */ 2476 static int proc_taint(struct ctl_table *table, int write, 2477 void __user *buffer, size_t *lenp, loff_t *ppos) 2478 { 2479 struct ctl_table t; 2480 unsigned long tmptaint = get_taint(); 2481 int err; 2482 2483 if (write && !capable(CAP_SYS_ADMIN)) 2484 return -EPERM; 2485 2486 t = *table; 2487 t.data = &tmptaint; 2488 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos); 2489 if (err < 0) 2490 return err; 2491 2492 if (write) { 2493 /* 2494 * Poor man's atomic or. Not worth adding a primitive 2495 * to everyone's atomic.h for this 2496 */ 2497 int i; 2498 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) { 2499 if ((tmptaint >> i) & 1) 2500 add_taint(i, LOCKDEP_STILL_OK); 2501 } 2502 } 2503 2504 return err; 2505 } 2506 2507 #ifdef CONFIG_PRINTK 2508 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, 2509 void __user *buffer, size_t *lenp, loff_t *ppos) 2510 { 2511 if (write && !capable(CAP_SYS_ADMIN)) 2512 return -EPERM; 2513 2514 return proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2515 } 2516 #endif 2517 2518 struct do_proc_dointvec_minmax_conv_param { 2519 int *min; 2520 int *max; 2521 }; 2522 2523 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, 2524 int *valp, 2525 int write, void *data) 2526 { 2527 struct do_proc_dointvec_minmax_conv_param *param = data; 2528 if (write) { 2529 int val = *negp ? -*lvalp : *lvalp; 2530 if ((param->min && *param->min > val) || 2531 (param->max && *param->max < val)) 2532 return -EINVAL; 2533 *valp = val; 2534 } else { 2535 int val = *valp; 2536 if (val < 0) { 2537 *negp = true; 2538 *lvalp = -(unsigned long)val; 2539 } else { 2540 *negp = false; 2541 *lvalp = (unsigned long)val; 2542 } 2543 } 2544 return 0; 2545 } 2546 2547 /** 2548 * proc_dointvec_minmax - read a vector of integers with min/max values 2549 * @table: the sysctl table 2550 * @write: %TRUE if this is a write to the sysctl file 2551 * @buffer: the user buffer 2552 * @lenp: the size of the user buffer 2553 * @ppos: file position 2554 * 2555 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2556 * values from/to the user buffer, treated as an ASCII string. 2557 * 2558 * This routine will ensure the values are within the range specified by 2559 * table->extra1 (min) and table->extra2 (max). 2560 * 2561 * Returns 0 on success. 2562 */ 2563 int proc_dointvec_minmax(struct ctl_table *table, int write, 2564 void __user *buffer, size_t *lenp, loff_t *ppos) 2565 { 2566 struct do_proc_dointvec_minmax_conv_param param = { 2567 .min = (int *) table->extra1, 2568 .max = (int *) table->extra2, 2569 }; 2570 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2571 do_proc_dointvec_minmax_conv, ¶m); 2572 } 2573 2574 struct do_proc_douintvec_minmax_conv_param { 2575 unsigned int *min; 2576 unsigned int *max; 2577 }; 2578 2579 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp, 2580 unsigned int *valp, 2581 int write, void *data) 2582 { 2583 struct do_proc_douintvec_minmax_conv_param *param = data; 2584 2585 if (write) { 2586 unsigned int val = *lvalp; 2587 2588 if ((param->min && *param->min > val) || 2589 (param->max && *param->max < val)) 2590 return -ERANGE; 2591 2592 if (*lvalp > UINT_MAX) 2593 return -EINVAL; 2594 *valp = val; 2595 } else { 2596 unsigned int val = *valp; 2597 *lvalp = (unsigned long) val; 2598 } 2599 2600 return 0; 2601 } 2602 2603 /** 2604 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values 2605 * @table: the sysctl table 2606 * @write: %TRUE if this is a write to the sysctl file 2607 * @buffer: the user buffer 2608 * @lenp: the size of the user buffer 2609 * @ppos: file position 2610 * 2611 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer 2612 * values from/to the user buffer, treated as an ASCII string. Negative 2613 * strings are not allowed. 2614 * 2615 * This routine will ensure the values are within the range specified by 2616 * table->extra1 (min) and table->extra2 (max). There is a final sanity 2617 * check for UINT_MAX to avoid having to support wrap around uses from 2618 * userspace. 2619 * 2620 * Returns 0 on success. 2621 */ 2622 int proc_douintvec_minmax(struct ctl_table *table, int write, 2623 void __user *buffer, size_t *lenp, loff_t *ppos) 2624 { 2625 struct do_proc_douintvec_minmax_conv_param param = { 2626 .min = (unsigned int *) table->extra1, 2627 .max = (unsigned int *) table->extra2, 2628 }; 2629 return do_proc_douintvec(table, write, buffer, lenp, ppos, 2630 do_proc_douintvec_minmax_conv, ¶m); 2631 } 2632 2633 static void validate_coredump_safety(void) 2634 { 2635 #ifdef CONFIG_COREDUMP 2636 if (suid_dumpable == SUID_DUMP_ROOT && 2637 core_pattern[0] != '/' && core_pattern[0] != '|') { 2638 printk(KERN_WARNING 2639 "Unsafe core_pattern used with fs.suid_dumpable=2.\n" 2640 "Pipe handler or fully qualified core dump path required.\n" 2641 "Set kernel.core_pattern before fs.suid_dumpable.\n" 2642 ); 2643 } 2644 #endif 2645 } 2646 2647 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write, 2648 void __user *buffer, size_t *lenp, loff_t *ppos) 2649 { 2650 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 2651 if (!error) 2652 validate_coredump_safety(); 2653 return error; 2654 } 2655 2656 #ifdef CONFIG_COREDUMP 2657 static int proc_dostring_coredump(struct ctl_table *table, int write, 2658 void __user *buffer, size_t *lenp, loff_t *ppos) 2659 { 2660 int error = proc_dostring(table, write, buffer, lenp, ppos); 2661 if (!error) 2662 validate_coredump_safety(); 2663 return error; 2664 } 2665 #endif 2666 2667 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write, 2668 void __user *buffer, 2669 size_t *lenp, loff_t *ppos, 2670 unsigned long convmul, 2671 unsigned long convdiv) 2672 { 2673 unsigned long *i, *min, *max; 2674 int vleft, first = 1, err = 0; 2675 size_t left; 2676 char *kbuf = NULL, *p; 2677 2678 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) { 2679 *lenp = 0; 2680 return 0; 2681 } 2682 2683 i = (unsigned long *) data; 2684 min = (unsigned long *) table->extra1; 2685 max = (unsigned long *) table->extra2; 2686 vleft = table->maxlen / sizeof(unsigned long); 2687 left = *lenp; 2688 2689 if (write) { 2690 if (proc_first_pos_non_zero_ignore(ppos, table)) 2691 goto out; 2692 2693 if (left > PAGE_SIZE - 1) 2694 left = PAGE_SIZE - 1; 2695 p = kbuf = memdup_user_nul(buffer, left); 2696 if (IS_ERR(kbuf)) 2697 return PTR_ERR(kbuf); 2698 } 2699 2700 for (; left && vleft--; i++, first = 0) { 2701 unsigned long val; 2702 2703 if (write) { 2704 bool neg; 2705 2706 left -= proc_skip_spaces(&p); 2707 2708 err = proc_get_long(&p, &left, &val, &neg, 2709 proc_wspace_sep, 2710 sizeof(proc_wspace_sep), NULL); 2711 if (err) 2712 break; 2713 if (neg) 2714 continue; 2715 val = convmul * val / convdiv; 2716 if ((min && val < *min) || (max && val > *max)) 2717 continue; 2718 *i = val; 2719 } else { 2720 val = convdiv * (*i) / convmul; 2721 if (!first) { 2722 err = proc_put_char(&buffer, &left, '\t'); 2723 if (err) 2724 break; 2725 } 2726 err = proc_put_long(&buffer, &left, val, false); 2727 if (err) 2728 break; 2729 } 2730 } 2731 2732 if (!write && !first && left && !err) 2733 err = proc_put_char(&buffer, &left, '\n'); 2734 if (write && !err) 2735 left -= proc_skip_spaces(&p); 2736 if (write) { 2737 kfree(kbuf); 2738 if (first) 2739 return err ? : -EINVAL; 2740 } 2741 *lenp -= left; 2742 out: 2743 *ppos += *lenp; 2744 return err; 2745 } 2746 2747 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write, 2748 void __user *buffer, 2749 size_t *lenp, loff_t *ppos, 2750 unsigned long convmul, 2751 unsigned long convdiv) 2752 { 2753 return __do_proc_doulongvec_minmax(table->data, table, write, 2754 buffer, lenp, ppos, convmul, convdiv); 2755 } 2756 2757 /** 2758 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2759 * @table: the sysctl table 2760 * @write: %TRUE if this is a write to the sysctl file 2761 * @buffer: the user buffer 2762 * @lenp: the size of the user buffer 2763 * @ppos: file position 2764 * 2765 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2766 * values from/to the user buffer, treated as an ASCII string. 2767 * 2768 * This routine will ensure the values are within the range specified by 2769 * table->extra1 (min) and table->extra2 (max). 2770 * 2771 * Returns 0 on success. 2772 */ 2773 int proc_doulongvec_minmax(struct ctl_table *table, int write, 2774 void __user *buffer, size_t *lenp, loff_t *ppos) 2775 { 2776 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l); 2777 } 2778 2779 /** 2780 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2781 * @table: the sysctl table 2782 * @write: %TRUE if this is a write to the sysctl file 2783 * @buffer: the user buffer 2784 * @lenp: the size of the user buffer 2785 * @ppos: file position 2786 * 2787 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2788 * values from/to the user buffer, treated as an ASCII string. The values 2789 * are treated as milliseconds, and converted to jiffies when they are stored. 2790 * 2791 * This routine will ensure the values are within the range specified by 2792 * table->extra1 (min) and table->extra2 (max). 2793 * 2794 * Returns 0 on success. 2795 */ 2796 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 2797 void __user *buffer, 2798 size_t *lenp, loff_t *ppos) 2799 { 2800 return do_proc_doulongvec_minmax(table, write, buffer, 2801 lenp, ppos, HZ, 1000l); 2802 } 2803 2804 2805 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp, 2806 int *valp, 2807 int write, void *data) 2808 { 2809 if (write) { 2810 if (*lvalp > INT_MAX / HZ) 2811 return 1; 2812 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2813 } else { 2814 int val = *valp; 2815 unsigned long lval; 2816 if (val < 0) { 2817 *negp = true; 2818 lval = -(unsigned long)val; 2819 } else { 2820 *negp = false; 2821 lval = (unsigned long)val; 2822 } 2823 *lvalp = lval / HZ; 2824 } 2825 return 0; 2826 } 2827 2828 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp, 2829 int *valp, 2830 int write, void *data) 2831 { 2832 if (write) { 2833 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ) 2834 return 1; 2835 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2836 } else { 2837 int val = *valp; 2838 unsigned long lval; 2839 if (val < 0) { 2840 *negp = true; 2841 lval = -(unsigned long)val; 2842 } else { 2843 *negp = false; 2844 lval = (unsigned long)val; 2845 } 2846 *lvalp = jiffies_to_clock_t(lval); 2847 } 2848 return 0; 2849 } 2850 2851 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp, 2852 int *valp, 2853 int write, void *data) 2854 { 2855 if (write) { 2856 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2857 2858 if (jif > INT_MAX) 2859 return 1; 2860 *valp = (int)jif; 2861 } else { 2862 int val = *valp; 2863 unsigned long lval; 2864 if (val < 0) { 2865 *negp = true; 2866 lval = -(unsigned long)val; 2867 } else { 2868 *negp = false; 2869 lval = (unsigned long)val; 2870 } 2871 *lvalp = jiffies_to_msecs(lval); 2872 } 2873 return 0; 2874 } 2875 2876 /** 2877 * proc_dointvec_jiffies - read a vector of integers as seconds 2878 * @table: the sysctl table 2879 * @write: %TRUE if this is a write to the sysctl file 2880 * @buffer: the user buffer 2881 * @lenp: the size of the user buffer 2882 * @ppos: file position 2883 * 2884 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2885 * values from/to the user buffer, treated as an ASCII string. 2886 * The values read are assumed to be in seconds, and are converted into 2887 * jiffies. 2888 * 2889 * Returns 0 on success. 2890 */ 2891 int proc_dointvec_jiffies(struct ctl_table *table, int write, 2892 void __user *buffer, size_t *lenp, loff_t *ppos) 2893 { 2894 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2895 do_proc_dointvec_jiffies_conv,NULL); 2896 } 2897 2898 /** 2899 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2900 * @table: the sysctl table 2901 * @write: %TRUE if this is a write to the sysctl file 2902 * @buffer: the user buffer 2903 * @lenp: the size of the user buffer 2904 * @ppos: pointer to the file position 2905 * 2906 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2907 * values from/to the user buffer, treated as an ASCII string. 2908 * The values read are assumed to be in 1/USER_HZ seconds, and 2909 * are converted into jiffies. 2910 * 2911 * Returns 0 on success. 2912 */ 2913 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 2914 void __user *buffer, size_t *lenp, loff_t *ppos) 2915 { 2916 return do_proc_dointvec(table,write,buffer,lenp,ppos, 2917 do_proc_dointvec_userhz_jiffies_conv,NULL); 2918 } 2919 2920 /** 2921 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2922 * @table: the sysctl table 2923 * @write: %TRUE if this is a write to the sysctl file 2924 * @buffer: the user buffer 2925 * @lenp: the size of the user buffer 2926 * @ppos: file position 2927 * @ppos: the current position in the file 2928 * 2929 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2930 * values from/to the user buffer, treated as an ASCII string. 2931 * The values read are assumed to be in 1/1000 seconds, and 2932 * are converted into jiffies. 2933 * 2934 * Returns 0 on success. 2935 */ 2936 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 2937 void __user *buffer, size_t *lenp, loff_t *ppos) 2938 { 2939 return do_proc_dointvec(table, write, buffer, lenp, ppos, 2940 do_proc_dointvec_ms_jiffies_conv, NULL); 2941 } 2942 2943 static int proc_do_cad_pid(struct ctl_table *table, int write, 2944 void __user *buffer, size_t *lenp, loff_t *ppos) 2945 { 2946 struct pid *new_pid; 2947 pid_t tmp; 2948 int r; 2949 2950 tmp = pid_vnr(cad_pid); 2951 2952 r = __do_proc_dointvec(&tmp, table, write, buffer, 2953 lenp, ppos, NULL, NULL); 2954 if (r || !write) 2955 return r; 2956 2957 new_pid = find_get_pid(tmp); 2958 if (!new_pid) 2959 return -ESRCH; 2960 2961 put_pid(xchg(&cad_pid, new_pid)); 2962 return 0; 2963 } 2964 2965 /** 2966 * proc_do_large_bitmap - read/write from/to a large bitmap 2967 * @table: the sysctl table 2968 * @write: %TRUE if this is a write to the sysctl file 2969 * @buffer: the user buffer 2970 * @lenp: the size of the user buffer 2971 * @ppos: file position 2972 * 2973 * The bitmap is stored at table->data and the bitmap length (in bits) 2974 * in table->maxlen. 2975 * 2976 * We use a range comma separated format (e.g. 1,3-4,10-10) so that 2977 * large bitmaps may be represented in a compact manner. Writing into 2978 * the file will clear the bitmap then update it with the given input. 2979 * 2980 * Returns 0 on success. 2981 */ 2982 int proc_do_large_bitmap(struct ctl_table *table, int write, 2983 void __user *buffer, size_t *lenp, loff_t *ppos) 2984 { 2985 int err = 0; 2986 bool first = 1; 2987 size_t left = *lenp; 2988 unsigned long bitmap_len = table->maxlen; 2989 unsigned long *bitmap = *(unsigned long **) table->data; 2990 unsigned long *tmp_bitmap = NULL; 2991 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c; 2992 2993 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) { 2994 *lenp = 0; 2995 return 0; 2996 } 2997 2998 if (write) { 2999 char *kbuf, *p; 3000 3001 if (left > PAGE_SIZE - 1) 3002 left = PAGE_SIZE - 1; 3003 3004 p = kbuf = memdup_user_nul(buffer, left); 3005 if (IS_ERR(kbuf)) 3006 return PTR_ERR(kbuf); 3007 3008 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long), 3009 GFP_KERNEL); 3010 if (!tmp_bitmap) { 3011 kfree(kbuf); 3012 return -ENOMEM; 3013 } 3014 proc_skip_char(&p, &left, '\n'); 3015 while (!err && left) { 3016 unsigned long val_a, val_b; 3017 bool neg; 3018 3019 err = proc_get_long(&p, &left, &val_a, &neg, tr_a, 3020 sizeof(tr_a), &c); 3021 if (err) 3022 break; 3023 if (val_a >= bitmap_len || neg) { 3024 err = -EINVAL; 3025 break; 3026 } 3027 3028 val_b = val_a; 3029 if (left) { 3030 p++; 3031 left--; 3032 } 3033 3034 if (c == '-') { 3035 err = proc_get_long(&p, &left, &val_b, 3036 &neg, tr_b, sizeof(tr_b), 3037 &c); 3038 if (err) 3039 break; 3040 if (val_b >= bitmap_len || neg || 3041 val_a > val_b) { 3042 err = -EINVAL; 3043 break; 3044 } 3045 if (left) { 3046 p++; 3047 left--; 3048 } 3049 } 3050 3051 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1); 3052 first = 0; 3053 proc_skip_char(&p, &left, '\n'); 3054 } 3055 kfree(kbuf); 3056 } else { 3057 unsigned long bit_a, bit_b = 0; 3058 3059 while (left) { 3060 bit_a = find_next_bit(bitmap, bitmap_len, bit_b); 3061 if (bit_a >= bitmap_len) 3062 break; 3063 bit_b = find_next_zero_bit(bitmap, bitmap_len, 3064 bit_a + 1) - 1; 3065 3066 if (!first) { 3067 err = proc_put_char(&buffer, &left, ','); 3068 if (err) 3069 break; 3070 } 3071 err = proc_put_long(&buffer, &left, bit_a, false); 3072 if (err) 3073 break; 3074 if (bit_a != bit_b) { 3075 err = proc_put_char(&buffer, &left, '-'); 3076 if (err) 3077 break; 3078 err = proc_put_long(&buffer, &left, bit_b, false); 3079 if (err) 3080 break; 3081 } 3082 3083 first = 0; bit_b++; 3084 } 3085 if (!err) 3086 err = proc_put_char(&buffer, &left, '\n'); 3087 } 3088 3089 if (!err) { 3090 if (write) { 3091 if (*ppos) 3092 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len); 3093 else 3094 bitmap_copy(bitmap, tmp_bitmap, bitmap_len); 3095 } 3096 kfree(tmp_bitmap); 3097 *lenp -= left; 3098 *ppos += *lenp; 3099 return 0; 3100 } else { 3101 kfree(tmp_bitmap); 3102 return err; 3103 } 3104 } 3105 3106 #else /* CONFIG_PROC_SYSCTL */ 3107 3108 int proc_dostring(struct ctl_table *table, int write, 3109 void __user *buffer, size_t *lenp, loff_t *ppos) 3110 { 3111 return -ENOSYS; 3112 } 3113 3114 int proc_dointvec(struct ctl_table *table, int write, 3115 void __user *buffer, size_t *lenp, loff_t *ppos) 3116 { 3117 return -ENOSYS; 3118 } 3119 3120 int proc_douintvec(struct ctl_table *table, int write, 3121 void __user *buffer, size_t *lenp, loff_t *ppos) 3122 { 3123 return -ENOSYS; 3124 } 3125 3126 int proc_dointvec_minmax(struct ctl_table *table, int write, 3127 void __user *buffer, size_t *lenp, loff_t *ppos) 3128 { 3129 return -ENOSYS; 3130 } 3131 3132 int proc_douintvec_minmax(struct ctl_table *table, int write, 3133 void __user *buffer, size_t *lenp, loff_t *ppos) 3134 { 3135 return -ENOSYS; 3136 } 3137 3138 int proc_dointvec_jiffies(struct ctl_table *table, int write, 3139 void __user *buffer, size_t *lenp, loff_t *ppos) 3140 { 3141 return -ENOSYS; 3142 } 3143 3144 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, 3145 void __user *buffer, size_t *lenp, loff_t *ppos) 3146 { 3147 return -ENOSYS; 3148 } 3149 3150 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, 3151 void __user *buffer, size_t *lenp, loff_t *ppos) 3152 { 3153 return -ENOSYS; 3154 } 3155 3156 int proc_doulongvec_minmax(struct ctl_table *table, int write, 3157 void __user *buffer, size_t *lenp, loff_t *ppos) 3158 { 3159 return -ENOSYS; 3160 } 3161 3162 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write, 3163 void __user *buffer, 3164 size_t *lenp, loff_t *ppos) 3165 { 3166 return -ENOSYS; 3167 } 3168 3169 3170 #endif /* CONFIG_PROC_SYSCTL */ 3171 3172 /* 3173 * No sense putting this after each symbol definition, twice, 3174 * exception granted :-) 3175 */ 3176 EXPORT_SYMBOL(proc_dointvec); 3177 EXPORT_SYMBOL(proc_douintvec); 3178 EXPORT_SYMBOL(proc_dointvec_jiffies); 3179 EXPORT_SYMBOL(proc_dointvec_minmax); 3180 EXPORT_SYMBOL_GPL(proc_douintvec_minmax); 3181 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 3182 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 3183 EXPORT_SYMBOL(proc_dostring); 3184 EXPORT_SYMBOL(proc_doulongvec_minmax); 3185 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 3186