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/config.h> 22 #include <linux/module.h> 23 #include <linux/mm.h> 24 #include <linux/swap.h> 25 #include <linux/slab.h> 26 #include <linux/sysctl.h> 27 #include <linux/proc_fs.h> 28 #include <linux/capability.h> 29 #include <linux/ctype.h> 30 #include <linux/utsname.h> 31 #include <linux/capability.h> 32 #include <linux/smp_lock.h> 33 #include <linux/init.h> 34 #include <linux/kernel.h> 35 #include <linux/kobject.h> 36 #include <linux/net.h> 37 #include <linux/sysrq.h> 38 #include <linux/highuid.h> 39 #include <linux/writeback.h> 40 #include <linux/hugetlb.h> 41 #include <linux/security.h> 42 #include <linux/initrd.h> 43 #include <linux/times.h> 44 #include <linux/limits.h> 45 #include <linux/dcache.h> 46 #include <linux/syscalls.h> 47 #include <linux/nfs_fs.h> 48 #include <linux/acpi.h> 49 50 #include <asm/uaccess.h> 51 #include <asm/processor.h> 52 53 extern int proc_nr_files(ctl_table *table, int write, struct file *filp, 54 void __user *buffer, size_t *lenp, loff_t *ppos); 55 56 #if defined(CONFIG_SYSCTL) 57 58 /* External variables not in a header file. */ 59 extern int C_A_D; 60 extern int sysctl_overcommit_memory; 61 extern int sysctl_overcommit_ratio; 62 extern int max_threads; 63 extern int sysrq_enabled; 64 extern int core_uses_pid; 65 extern int suid_dumpable; 66 extern char core_pattern[]; 67 extern int cad_pid; 68 extern int pid_max; 69 extern int min_free_kbytes; 70 extern int printk_ratelimit_jiffies; 71 extern int printk_ratelimit_burst; 72 extern int pid_max_min, pid_max_max; 73 extern int sysctl_drop_caches; 74 extern int percpu_pagelist_fraction; 75 76 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 77 int unknown_nmi_panic; 78 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, 79 void __user *, size_t *, loff_t *); 80 #endif 81 82 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 83 static int maxolduid = 65535; 84 static int minolduid; 85 static int min_percpu_pagelist_fract = 8; 86 87 static int ngroups_max = NGROUPS_MAX; 88 89 #ifdef CONFIG_KMOD 90 extern char modprobe_path[]; 91 #endif 92 #ifdef CONFIG_CHR_DEV_SG 93 extern int sg_big_buff; 94 #endif 95 #ifdef CONFIG_SYSVIPC 96 extern size_t shm_ctlmax; 97 extern size_t shm_ctlall; 98 extern int shm_ctlmni; 99 extern int msg_ctlmax; 100 extern int msg_ctlmnb; 101 extern int msg_ctlmni; 102 extern int sem_ctls[]; 103 #endif 104 105 #ifdef __sparc__ 106 extern char reboot_command []; 107 extern int stop_a_enabled; 108 extern int scons_pwroff; 109 #endif 110 111 #ifdef __hppa__ 112 extern int pwrsw_enabled; 113 extern int unaligned_enabled; 114 #endif 115 116 #ifdef CONFIG_S390 117 #ifdef CONFIG_MATHEMU 118 extern int sysctl_ieee_emulation_warnings; 119 #endif 120 extern int sysctl_userprocess_debug; 121 extern int spin_retry; 122 #endif 123 124 extern int sysctl_hz_timer; 125 126 #ifdef CONFIG_BSD_PROCESS_ACCT 127 extern int acct_parm[]; 128 #endif 129 130 #ifdef CONFIG_IA64 131 extern int no_unaligned_warning; 132 #endif 133 134 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t, 135 ctl_table *, void **); 136 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 137 void __user *buffer, size_t *lenp, loff_t *ppos); 138 139 static ctl_table root_table[]; 140 static struct ctl_table_header root_table_header = 141 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; 142 143 static ctl_table kern_table[]; 144 static ctl_table vm_table[]; 145 static ctl_table proc_table[]; 146 static ctl_table fs_table[]; 147 static ctl_table debug_table[]; 148 static ctl_table dev_table[]; 149 extern ctl_table random_table[]; 150 #ifdef CONFIG_UNIX98_PTYS 151 extern ctl_table pty_table[]; 152 #endif 153 #ifdef CONFIG_INOTIFY 154 extern ctl_table inotify_table[]; 155 #endif 156 157 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 158 int sysctl_legacy_va_layout; 159 #endif 160 161 /* /proc declarations: */ 162 163 #ifdef CONFIG_PROC_FS 164 165 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); 166 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); 167 static int proc_opensys(struct inode *, struct file *); 168 169 struct file_operations proc_sys_file_operations = { 170 .open = proc_opensys, 171 .read = proc_readsys, 172 .write = proc_writesys, 173 }; 174 175 extern struct proc_dir_entry *proc_sys_root; 176 177 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *); 178 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); 179 #endif 180 181 /* The default sysctl tables: */ 182 183 static ctl_table root_table[] = { 184 { 185 .ctl_name = CTL_KERN, 186 .procname = "kernel", 187 .mode = 0555, 188 .child = kern_table, 189 }, 190 { 191 .ctl_name = CTL_VM, 192 .procname = "vm", 193 .mode = 0555, 194 .child = vm_table, 195 }, 196 #ifdef CONFIG_NET 197 { 198 .ctl_name = CTL_NET, 199 .procname = "net", 200 .mode = 0555, 201 .child = net_table, 202 }, 203 #endif 204 { 205 .ctl_name = CTL_PROC, 206 .procname = "proc", 207 .mode = 0555, 208 .child = proc_table, 209 }, 210 { 211 .ctl_name = CTL_FS, 212 .procname = "fs", 213 .mode = 0555, 214 .child = fs_table, 215 }, 216 { 217 .ctl_name = CTL_DEBUG, 218 .procname = "debug", 219 .mode = 0555, 220 .child = debug_table, 221 }, 222 { 223 .ctl_name = CTL_DEV, 224 .procname = "dev", 225 .mode = 0555, 226 .child = dev_table, 227 }, 228 229 { .ctl_name = 0 } 230 }; 231 232 static ctl_table kern_table[] = { 233 { 234 .ctl_name = KERN_OSTYPE, 235 .procname = "ostype", 236 .data = system_utsname.sysname, 237 .maxlen = sizeof(system_utsname.sysname), 238 .mode = 0444, 239 .proc_handler = &proc_doutsstring, 240 .strategy = &sysctl_string, 241 }, 242 { 243 .ctl_name = KERN_OSRELEASE, 244 .procname = "osrelease", 245 .data = system_utsname.release, 246 .maxlen = sizeof(system_utsname.release), 247 .mode = 0444, 248 .proc_handler = &proc_doutsstring, 249 .strategy = &sysctl_string, 250 }, 251 { 252 .ctl_name = KERN_VERSION, 253 .procname = "version", 254 .data = system_utsname.version, 255 .maxlen = sizeof(system_utsname.version), 256 .mode = 0444, 257 .proc_handler = &proc_doutsstring, 258 .strategy = &sysctl_string, 259 }, 260 { 261 .ctl_name = KERN_NODENAME, 262 .procname = "hostname", 263 .data = system_utsname.nodename, 264 .maxlen = sizeof(system_utsname.nodename), 265 .mode = 0644, 266 .proc_handler = &proc_doutsstring, 267 .strategy = &sysctl_string, 268 }, 269 { 270 .ctl_name = KERN_DOMAINNAME, 271 .procname = "domainname", 272 .data = system_utsname.domainname, 273 .maxlen = sizeof(system_utsname.domainname), 274 .mode = 0644, 275 .proc_handler = &proc_doutsstring, 276 .strategy = &sysctl_string, 277 }, 278 { 279 .ctl_name = KERN_PANIC, 280 .procname = "panic", 281 .data = &panic_timeout, 282 .maxlen = sizeof(int), 283 .mode = 0644, 284 .proc_handler = &proc_dointvec, 285 }, 286 { 287 .ctl_name = KERN_CORE_USES_PID, 288 .procname = "core_uses_pid", 289 .data = &core_uses_pid, 290 .maxlen = sizeof(int), 291 .mode = 0644, 292 .proc_handler = &proc_dointvec, 293 }, 294 { 295 .ctl_name = KERN_CORE_PATTERN, 296 .procname = "core_pattern", 297 .data = core_pattern, 298 .maxlen = 64, 299 .mode = 0644, 300 .proc_handler = &proc_dostring, 301 .strategy = &sysctl_string, 302 }, 303 { 304 .ctl_name = KERN_TAINTED, 305 .procname = "tainted", 306 .data = &tainted, 307 .maxlen = sizeof(int), 308 .mode = 0444, 309 .proc_handler = &proc_dointvec, 310 }, 311 { 312 .ctl_name = KERN_CAP_BSET, 313 .procname = "cap-bound", 314 .data = &cap_bset, 315 .maxlen = sizeof(kernel_cap_t), 316 .mode = 0600, 317 .proc_handler = &proc_dointvec_bset, 318 }, 319 #ifdef CONFIG_BLK_DEV_INITRD 320 { 321 .ctl_name = KERN_REALROOTDEV, 322 .procname = "real-root-dev", 323 .data = &real_root_dev, 324 .maxlen = sizeof(int), 325 .mode = 0644, 326 .proc_handler = &proc_dointvec, 327 }, 328 #endif 329 #ifdef __sparc__ 330 { 331 .ctl_name = KERN_SPARC_REBOOT, 332 .procname = "reboot-cmd", 333 .data = reboot_command, 334 .maxlen = 256, 335 .mode = 0644, 336 .proc_handler = &proc_dostring, 337 .strategy = &sysctl_string, 338 }, 339 { 340 .ctl_name = KERN_SPARC_STOP_A, 341 .procname = "stop-a", 342 .data = &stop_a_enabled, 343 .maxlen = sizeof (int), 344 .mode = 0644, 345 .proc_handler = &proc_dointvec, 346 }, 347 { 348 .ctl_name = KERN_SPARC_SCONS_PWROFF, 349 .procname = "scons-poweroff", 350 .data = &scons_pwroff, 351 .maxlen = sizeof (int), 352 .mode = 0644, 353 .proc_handler = &proc_dointvec, 354 }, 355 #endif 356 #ifdef __hppa__ 357 { 358 .ctl_name = KERN_HPPA_PWRSW, 359 .procname = "soft-power", 360 .data = &pwrsw_enabled, 361 .maxlen = sizeof (int), 362 .mode = 0644, 363 .proc_handler = &proc_dointvec, 364 }, 365 { 366 .ctl_name = KERN_HPPA_UNALIGNED, 367 .procname = "unaligned-trap", 368 .data = &unaligned_enabled, 369 .maxlen = sizeof (int), 370 .mode = 0644, 371 .proc_handler = &proc_dointvec, 372 }, 373 #endif 374 { 375 .ctl_name = KERN_CTLALTDEL, 376 .procname = "ctrl-alt-del", 377 .data = &C_A_D, 378 .maxlen = sizeof(int), 379 .mode = 0644, 380 .proc_handler = &proc_dointvec, 381 }, 382 { 383 .ctl_name = KERN_PRINTK, 384 .procname = "printk", 385 .data = &console_loglevel, 386 .maxlen = 4*sizeof(int), 387 .mode = 0644, 388 .proc_handler = &proc_dointvec, 389 }, 390 #ifdef CONFIG_KMOD 391 { 392 .ctl_name = KERN_MODPROBE, 393 .procname = "modprobe", 394 .data = &modprobe_path, 395 .maxlen = KMOD_PATH_LEN, 396 .mode = 0644, 397 .proc_handler = &proc_dostring, 398 .strategy = &sysctl_string, 399 }, 400 #endif 401 #ifdef CONFIG_HOTPLUG 402 { 403 .ctl_name = KERN_HOTPLUG, 404 .procname = "hotplug", 405 .data = &uevent_helper, 406 .maxlen = UEVENT_HELPER_PATH_LEN, 407 .mode = 0644, 408 .proc_handler = &proc_dostring, 409 .strategy = &sysctl_string, 410 }, 411 #endif 412 #ifdef CONFIG_CHR_DEV_SG 413 { 414 .ctl_name = KERN_SG_BIG_BUFF, 415 .procname = "sg-big-buff", 416 .data = &sg_big_buff, 417 .maxlen = sizeof (int), 418 .mode = 0444, 419 .proc_handler = &proc_dointvec, 420 }, 421 #endif 422 #ifdef CONFIG_BSD_PROCESS_ACCT 423 { 424 .ctl_name = KERN_ACCT, 425 .procname = "acct", 426 .data = &acct_parm, 427 .maxlen = 3*sizeof(int), 428 .mode = 0644, 429 .proc_handler = &proc_dointvec, 430 }, 431 #endif 432 #ifdef CONFIG_SYSVIPC 433 { 434 .ctl_name = KERN_SHMMAX, 435 .procname = "shmmax", 436 .data = &shm_ctlmax, 437 .maxlen = sizeof (size_t), 438 .mode = 0644, 439 .proc_handler = &proc_doulongvec_minmax, 440 }, 441 { 442 .ctl_name = KERN_SHMALL, 443 .procname = "shmall", 444 .data = &shm_ctlall, 445 .maxlen = sizeof (size_t), 446 .mode = 0644, 447 .proc_handler = &proc_doulongvec_minmax, 448 }, 449 { 450 .ctl_name = KERN_SHMMNI, 451 .procname = "shmmni", 452 .data = &shm_ctlmni, 453 .maxlen = sizeof (int), 454 .mode = 0644, 455 .proc_handler = &proc_dointvec, 456 }, 457 { 458 .ctl_name = KERN_MSGMAX, 459 .procname = "msgmax", 460 .data = &msg_ctlmax, 461 .maxlen = sizeof (int), 462 .mode = 0644, 463 .proc_handler = &proc_dointvec, 464 }, 465 { 466 .ctl_name = KERN_MSGMNI, 467 .procname = "msgmni", 468 .data = &msg_ctlmni, 469 .maxlen = sizeof (int), 470 .mode = 0644, 471 .proc_handler = &proc_dointvec, 472 }, 473 { 474 .ctl_name = KERN_MSGMNB, 475 .procname = "msgmnb", 476 .data = &msg_ctlmnb, 477 .maxlen = sizeof (int), 478 .mode = 0644, 479 .proc_handler = &proc_dointvec, 480 }, 481 { 482 .ctl_name = KERN_SEM, 483 .procname = "sem", 484 .data = &sem_ctls, 485 .maxlen = 4*sizeof (int), 486 .mode = 0644, 487 .proc_handler = &proc_dointvec, 488 }, 489 #endif 490 #ifdef CONFIG_MAGIC_SYSRQ 491 { 492 .ctl_name = KERN_SYSRQ, 493 .procname = "sysrq", 494 .data = &sysrq_enabled, 495 .maxlen = sizeof (int), 496 .mode = 0644, 497 .proc_handler = &proc_dointvec, 498 }, 499 #endif 500 { 501 .ctl_name = KERN_CADPID, 502 .procname = "cad_pid", 503 .data = &cad_pid, 504 .maxlen = sizeof (int), 505 .mode = 0600, 506 .proc_handler = &proc_dointvec, 507 }, 508 { 509 .ctl_name = KERN_MAX_THREADS, 510 .procname = "threads-max", 511 .data = &max_threads, 512 .maxlen = sizeof(int), 513 .mode = 0644, 514 .proc_handler = &proc_dointvec, 515 }, 516 { 517 .ctl_name = KERN_RANDOM, 518 .procname = "random", 519 .mode = 0555, 520 .child = random_table, 521 }, 522 #ifdef CONFIG_UNIX98_PTYS 523 { 524 .ctl_name = KERN_PTY, 525 .procname = "pty", 526 .mode = 0555, 527 .child = pty_table, 528 }, 529 #endif 530 { 531 .ctl_name = KERN_OVERFLOWUID, 532 .procname = "overflowuid", 533 .data = &overflowuid, 534 .maxlen = sizeof(int), 535 .mode = 0644, 536 .proc_handler = &proc_dointvec_minmax, 537 .strategy = &sysctl_intvec, 538 .extra1 = &minolduid, 539 .extra2 = &maxolduid, 540 }, 541 { 542 .ctl_name = KERN_OVERFLOWGID, 543 .procname = "overflowgid", 544 .data = &overflowgid, 545 .maxlen = sizeof(int), 546 .mode = 0644, 547 .proc_handler = &proc_dointvec_minmax, 548 .strategy = &sysctl_intvec, 549 .extra1 = &minolduid, 550 .extra2 = &maxolduid, 551 }, 552 #ifdef CONFIG_S390 553 #ifdef CONFIG_MATHEMU 554 { 555 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 556 .procname = "ieee_emulation_warnings", 557 .data = &sysctl_ieee_emulation_warnings, 558 .maxlen = sizeof(int), 559 .mode = 0644, 560 .proc_handler = &proc_dointvec, 561 }, 562 #endif 563 #ifdef CONFIG_NO_IDLE_HZ 564 { 565 .ctl_name = KERN_HZ_TIMER, 566 .procname = "hz_timer", 567 .data = &sysctl_hz_timer, 568 .maxlen = sizeof(int), 569 .mode = 0644, 570 .proc_handler = &proc_dointvec, 571 }, 572 #endif 573 { 574 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 575 .procname = "userprocess_debug", 576 .data = &sysctl_userprocess_debug, 577 .maxlen = sizeof(int), 578 .mode = 0644, 579 .proc_handler = &proc_dointvec, 580 }, 581 #endif 582 { 583 .ctl_name = KERN_PIDMAX, 584 .procname = "pid_max", 585 .data = &pid_max, 586 .maxlen = sizeof (int), 587 .mode = 0644, 588 .proc_handler = &proc_dointvec_minmax, 589 .strategy = sysctl_intvec, 590 .extra1 = &pid_max_min, 591 .extra2 = &pid_max_max, 592 }, 593 { 594 .ctl_name = KERN_PANIC_ON_OOPS, 595 .procname = "panic_on_oops", 596 .data = &panic_on_oops, 597 .maxlen = sizeof(int), 598 .mode = 0644, 599 .proc_handler = &proc_dointvec, 600 }, 601 { 602 .ctl_name = KERN_PRINTK_RATELIMIT, 603 .procname = "printk_ratelimit", 604 .data = &printk_ratelimit_jiffies, 605 .maxlen = sizeof(int), 606 .mode = 0644, 607 .proc_handler = &proc_dointvec_jiffies, 608 .strategy = &sysctl_jiffies, 609 }, 610 { 611 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 612 .procname = "printk_ratelimit_burst", 613 .data = &printk_ratelimit_burst, 614 .maxlen = sizeof(int), 615 .mode = 0644, 616 .proc_handler = &proc_dointvec, 617 }, 618 { 619 .ctl_name = KERN_NGROUPS_MAX, 620 .procname = "ngroups_max", 621 .data = &ngroups_max, 622 .maxlen = sizeof (int), 623 .mode = 0444, 624 .proc_handler = &proc_dointvec, 625 }, 626 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 627 { 628 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 629 .procname = "unknown_nmi_panic", 630 .data = &unknown_nmi_panic, 631 .maxlen = sizeof (int), 632 .mode = 0644, 633 .proc_handler = &proc_unknown_nmi_panic, 634 }, 635 #endif 636 #if defined(CONFIG_X86) 637 { 638 .ctl_name = KERN_BOOTLOADER_TYPE, 639 .procname = "bootloader_type", 640 .data = &bootloader_type, 641 .maxlen = sizeof (int), 642 .mode = 0444, 643 .proc_handler = &proc_dointvec, 644 }, 645 #endif 646 #if defined(CONFIG_MMU) 647 { 648 .ctl_name = KERN_RANDOMIZE, 649 .procname = "randomize_va_space", 650 .data = &randomize_va_space, 651 .maxlen = sizeof(int), 652 .mode = 0644, 653 .proc_handler = &proc_dointvec, 654 }, 655 #endif 656 #if defined(CONFIG_S390) && defined(CONFIG_SMP) 657 { 658 .ctl_name = KERN_SPIN_RETRY, 659 .procname = "spin_retry", 660 .data = &spin_retry, 661 .maxlen = sizeof (int), 662 .mode = 0644, 663 .proc_handler = &proc_dointvec, 664 }, 665 #endif 666 #ifdef CONFIG_ACPI_SLEEP 667 { 668 .ctl_name = KERN_ACPI_VIDEO_FLAGS, 669 .procname = "acpi_video_flags", 670 .data = &acpi_video_flags, 671 .maxlen = sizeof (unsigned long), 672 .mode = 0644, 673 .proc_handler = &proc_doulongvec_minmax, 674 }, 675 #endif 676 #ifdef CONFIG_IA64 677 { 678 .ctl_name = KERN_IA64_UNALIGNED, 679 .procname = "ignore-unaligned-usertrap", 680 .data = &no_unaligned_warning, 681 .maxlen = sizeof (int), 682 .mode = 0644, 683 .proc_handler = &proc_dointvec, 684 }, 685 #endif 686 { .ctl_name = 0 } 687 }; 688 689 /* Constants for minimum and maximum testing in vm_table. 690 We use these as one-element integer vectors. */ 691 static int zero; 692 static int one_hundred = 100; 693 694 695 static ctl_table vm_table[] = { 696 { 697 .ctl_name = VM_OVERCOMMIT_MEMORY, 698 .procname = "overcommit_memory", 699 .data = &sysctl_overcommit_memory, 700 .maxlen = sizeof(sysctl_overcommit_memory), 701 .mode = 0644, 702 .proc_handler = &proc_dointvec, 703 }, 704 { 705 .ctl_name = VM_OVERCOMMIT_RATIO, 706 .procname = "overcommit_ratio", 707 .data = &sysctl_overcommit_ratio, 708 .maxlen = sizeof(sysctl_overcommit_ratio), 709 .mode = 0644, 710 .proc_handler = &proc_dointvec, 711 }, 712 { 713 .ctl_name = VM_PAGE_CLUSTER, 714 .procname = "page-cluster", 715 .data = &page_cluster, 716 .maxlen = sizeof(int), 717 .mode = 0644, 718 .proc_handler = &proc_dointvec, 719 }, 720 { 721 .ctl_name = VM_DIRTY_BACKGROUND, 722 .procname = "dirty_background_ratio", 723 .data = &dirty_background_ratio, 724 .maxlen = sizeof(dirty_background_ratio), 725 .mode = 0644, 726 .proc_handler = &proc_dointvec_minmax, 727 .strategy = &sysctl_intvec, 728 .extra1 = &zero, 729 .extra2 = &one_hundred, 730 }, 731 { 732 .ctl_name = VM_DIRTY_RATIO, 733 .procname = "dirty_ratio", 734 .data = &vm_dirty_ratio, 735 .maxlen = sizeof(vm_dirty_ratio), 736 .mode = 0644, 737 .proc_handler = &proc_dointvec_minmax, 738 .strategy = &sysctl_intvec, 739 .extra1 = &zero, 740 .extra2 = &one_hundred, 741 }, 742 { 743 .ctl_name = VM_DIRTY_WB_CS, 744 .procname = "dirty_writeback_centisecs", 745 .data = &dirty_writeback_interval, 746 .maxlen = sizeof(dirty_writeback_interval), 747 .mode = 0644, 748 .proc_handler = &dirty_writeback_centisecs_handler, 749 }, 750 { 751 .ctl_name = VM_DIRTY_EXPIRE_CS, 752 .procname = "dirty_expire_centisecs", 753 .data = &dirty_expire_interval, 754 .maxlen = sizeof(dirty_expire_interval), 755 .mode = 0644, 756 .proc_handler = &proc_dointvec_userhz_jiffies, 757 }, 758 { 759 .ctl_name = VM_NR_PDFLUSH_THREADS, 760 .procname = "nr_pdflush_threads", 761 .data = &nr_pdflush_threads, 762 .maxlen = sizeof nr_pdflush_threads, 763 .mode = 0444 /* read-only*/, 764 .proc_handler = &proc_dointvec, 765 }, 766 { 767 .ctl_name = VM_SWAPPINESS, 768 .procname = "swappiness", 769 .data = &vm_swappiness, 770 .maxlen = sizeof(vm_swappiness), 771 .mode = 0644, 772 .proc_handler = &proc_dointvec_minmax, 773 .strategy = &sysctl_intvec, 774 .extra1 = &zero, 775 .extra2 = &one_hundred, 776 }, 777 #ifdef CONFIG_HUGETLB_PAGE 778 { 779 .ctl_name = VM_HUGETLB_PAGES, 780 .procname = "nr_hugepages", 781 .data = &max_huge_pages, 782 .maxlen = sizeof(unsigned long), 783 .mode = 0644, 784 .proc_handler = &hugetlb_sysctl_handler, 785 .extra1 = (void *)&hugetlb_zero, 786 .extra2 = (void *)&hugetlb_infinity, 787 }, 788 { 789 .ctl_name = VM_HUGETLB_GROUP, 790 .procname = "hugetlb_shm_group", 791 .data = &sysctl_hugetlb_shm_group, 792 .maxlen = sizeof(gid_t), 793 .mode = 0644, 794 .proc_handler = &proc_dointvec, 795 }, 796 #endif 797 { 798 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 799 .procname = "lowmem_reserve_ratio", 800 .data = &sysctl_lowmem_reserve_ratio, 801 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 802 .mode = 0644, 803 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 804 .strategy = &sysctl_intvec, 805 }, 806 { 807 .ctl_name = VM_DROP_PAGECACHE, 808 .procname = "drop_caches", 809 .data = &sysctl_drop_caches, 810 .maxlen = sizeof(int), 811 .mode = 0644, 812 .proc_handler = drop_caches_sysctl_handler, 813 .strategy = &sysctl_intvec, 814 }, 815 { 816 .ctl_name = VM_MIN_FREE_KBYTES, 817 .procname = "min_free_kbytes", 818 .data = &min_free_kbytes, 819 .maxlen = sizeof(min_free_kbytes), 820 .mode = 0644, 821 .proc_handler = &min_free_kbytes_sysctl_handler, 822 .strategy = &sysctl_intvec, 823 .extra1 = &zero, 824 }, 825 { 826 .ctl_name = VM_PERCPU_PAGELIST_FRACTION, 827 .procname = "percpu_pagelist_fraction", 828 .data = &percpu_pagelist_fraction, 829 .maxlen = sizeof(percpu_pagelist_fraction), 830 .mode = 0644, 831 .proc_handler = &percpu_pagelist_fraction_sysctl_handler, 832 .strategy = &sysctl_intvec, 833 .extra1 = &min_percpu_pagelist_fract, 834 }, 835 #ifdef CONFIG_MMU 836 { 837 .ctl_name = VM_MAX_MAP_COUNT, 838 .procname = "max_map_count", 839 .data = &sysctl_max_map_count, 840 .maxlen = sizeof(sysctl_max_map_count), 841 .mode = 0644, 842 .proc_handler = &proc_dointvec 843 }, 844 #endif 845 { 846 .ctl_name = VM_LAPTOP_MODE, 847 .procname = "laptop_mode", 848 .data = &laptop_mode, 849 .maxlen = sizeof(laptop_mode), 850 .mode = 0644, 851 .proc_handler = &proc_dointvec_jiffies, 852 .strategy = &sysctl_jiffies, 853 }, 854 { 855 .ctl_name = VM_BLOCK_DUMP, 856 .procname = "block_dump", 857 .data = &block_dump, 858 .maxlen = sizeof(block_dump), 859 .mode = 0644, 860 .proc_handler = &proc_dointvec, 861 .strategy = &sysctl_intvec, 862 .extra1 = &zero, 863 }, 864 { 865 .ctl_name = VM_VFS_CACHE_PRESSURE, 866 .procname = "vfs_cache_pressure", 867 .data = &sysctl_vfs_cache_pressure, 868 .maxlen = sizeof(sysctl_vfs_cache_pressure), 869 .mode = 0644, 870 .proc_handler = &proc_dointvec, 871 .strategy = &sysctl_intvec, 872 .extra1 = &zero, 873 }, 874 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 875 { 876 .ctl_name = VM_LEGACY_VA_LAYOUT, 877 .procname = "legacy_va_layout", 878 .data = &sysctl_legacy_va_layout, 879 .maxlen = sizeof(sysctl_legacy_va_layout), 880 .mode = 0644, 881 .proc_handler = &proc_dointvec, 882 .strategy = &sysctl_intvec, 883 .extra1 = &zero, 884 }, 885 #endif 886 #ifdef CONFIG_SWAP 887 { 888 .ctl_name = VM_SWAP_TOKEN_TIMEOUT, 889 .procname = "swap_token_timeout", 890 .data = &swap_token_default_timeout, 891 .maxlen = sizeof(swap_token_default_timeout), 892 .mode = 0644, 893 .proc_handler = &proc_dointvec_jiffies, 894 .strategy = &sysctl_jiffies, 895 }, 896 #endif 897 #ifdef CONFIG_NUMA 898 { 899 .ctl_name = VM_ZONE_RECLAIM_MODE, 900 .procname = "zone_reclaim_mode", 901 .data = &zone_reclaim_mode, 902 .maxlen = sizeof(zone_reclaim_mode), 903 .mode = 0644, 904 .proc_handler = &proc_dointvec, 905 .strategy = &sysctl_intvec, 906 .extra1 = &zero, 907 }, 908 { 909 .ctl_name = VM_ZONE_RECLAIM_INTERVAL, 910 .procname = "zone_reclaim_interval", 911 .data = &zone_reclaim_interval, 912 .maxlen = sizeof(zone_reclaim_interval), 913 .mode = 0644, 914 .proc_handler = &proc_dointvec_jiffies, 915 .strategy = &sysctl_jiffies, 916 }, 917 #endif 918 { .ctl_name = 0 } 919 }; 920 921 static ctl_table proc_table[] = { 922 { .ctl_name = 0 } 923 }; 924 925 static ctl_table fs_table[] = { 926 { 927 .ctl_name = FS_NRINODE, 928 .procname = "inode-nr", 929 .data = &inodes_stat, 930 .maxlen = 2*sizeof(int), 931 .mode = 0444, 932 .proc_handler = &proc_dointvec, 933 }, 934 { 935 .ctl_name = FS_STATINODE, 936 .procname = "inode-state", 937 .data = &inodes_stat, 938 .maxlen = 7*sizeof(int), 939 .mode = 0444, 940 .proc_handler = &proc_dointvec, 941 }, 942 { 943 .ctl_name = FS_NRFILE, 944 .procname = "file-nr", 945 .data = &files_stat, 946 .maxlen = 3*sizeof(int), 947 .mode = 0444, 948 .proc_handler = &proc_nr_files, 949 }, 950 { 951 .ctl_name = FS_MAXFILE, 952 .procname = "file-max", 953 .data = &files_stat.max_files, 954 .maxlen = sizeof(int), 955 .mode = 0644, 956 .proc_handler = &proc_dointvec, 957 }, 958 { 959 .ctl_name = FS_DENTRY, 960 .procname = "dentry-state", 961 .data = &dentry_stat, 962 .maxlen = 6*sizeof(int), 963 .mode = 0444, 964 .proc_handler = &proc_dointvec, 965 }, 966 { 967 .ctl_name = FS_OVERFLOWUID, 968 .procname = "overflowuid", 969 .data = &fs_overflowuid, 970 .maxlen = sizeof(int), 971 .mode = 0644, 972 .proc_handler = &proc_dointvec_minmax, 973 .strategy = &sysctl_intvec, 974 .extra1 = &minolduid, 975 .extra2 = &maxolduid, 976 }, 977 { 978 .ctl_name = FS_OVERFLOWGID, 979 .procname = "overflowgid", 980 .data = &fs_overflowgid, 981 .maxlen = sizeof(int), 982 .mode = 0644, 983 .proc_handler = &proc_dointvec_minmax, 984 .strategy = &sysctl_intvec, 985 .extra1 = &minolduid, 986 .extra2 = &maxolduid, 987 }, 988 { 989 .ctl_name = FS_LEASES, 990 .procname = "leases-enable", 991 .data = &leases_enable, 992 .maxlen = sizeof(int), 993 .mode = 0644, 994 .proc_handler = &proc_dointvec, 995 }, 996 #ifdef CONFIG_DNOTIFY 997 { 998 .ctl_name = FS_DIR_NOTIFY, 999 .procname = "dir-notify-enable", 1000 .data = &dir_notify_enable, 1001 .maxlen = sizeof(int), 1002 .mode = 0644, 1003 .proc_handler = &proc_dointvec, 1004 }, 1005 #endif 1006 #ifdef CONFIG_MMU 1007 { 1008 .ctl_name = FS_LEASE_TIME, 1009 .procname = "lease-break-time", 1010 .data = &lease_break_time, 1011 .maxlen = sizeof(int), 1012 .mode = 0644, 1013 .proc_handler = &proc_dointvec, 1014 }, 1015 { 1016 .ctl_name = FS_AIO_NR, 1017 .procname = "aio-nr", 1018 .data = &aio_nr, 1019 .maxlen = sizeof(aio_nr), 1020 .mode = 0444, 1021 .proc_handler = &proc_doulongvec_minmax, 1022 }, 1023 { 1024 .ctl_name = FS_AIO_MAX_NR, 1025 .procname = "aio-max-nr", 1026 .data = &aio_max_nr, 1027 .maxlen = sizeof(aio_max_nr), 1028 .mode = 0644, 1029 .proc_handler = &proc_doulongvec_minmax, 1030 }, 1031 #ifdef CONFIG_INOTIFY 1032 { 1033 .ctl_name = FS_INOTIFY, 1034 .procname = "inotify", 1035 .mode = 0555, 1036 .child = inotify_table, 1037 }, 1038 #endif 1039 #endif 1040 { 1041 .ctl_name = KERN_SETUID_DUMPABLE, 1042 .procname = "suid_dumpable", 1043 .data = &suid_dumpable, 1044 .maxlen = sizeof(int), 1045 .mode = 0644, 1046 .proc_handler = &proc_dointvec, 1047 }, 1048 { .ctl_name = 0 } 1049 }; 1050 1051 static ctl_table debug_table[] = { 1052 { .ctl_name = 0 } 1053 }; 1054 1055 static ctl_table dev_table[] = { 1056 { .ctl_name = 0 } 1057 }; 1058 1059 extern void init_irq_proc (void); 1060 1061 static DEFINE_SPINLOCK(sysctl_lock); 1062 1063 /* called under sysctl_lock */ 1064 static int use_table(struct ctl_table_header *p) 1065 { 1066 if (unlikely(p->unregistering)) 1067 return 0; 1068 p->used++; 1069 return 1; 1070 } 1071 1072 /* called under sysctl_lock */ 1073 static void unuse_table(struct ctl_table_header *p) 1074 { 1075 if (!--p->used) 1076 if (unlikely(p->unregistering)) 1077 complete(p->unregistering); 1078 } 1079 1080 /* called under sysctl_lock, will reacquire if has to wait */ 1081 static void start_unregistering(struct ctl_table_header *p) 1082 { 1083 /* 1084 * if p->used is 0, nobody will ever touch that entry again; 1085 * we'll eliminate all paths to it before dropping sysctl_lock 1086 */ 1087 if (unlikely(p->used)) { 1088 struct completion wait; 1089 init_completion(&wait); 1090 p->unregistering = &wait; 1091 spin_unlock(&sysctl_lock); 1092 wait_for_completion(&wait); 1093 spin_lock(&sysctl_lock); 1094 } 1095 /* 1096 * do not remove from the list until nobody holds it; walking the 1097 * list in do_sysctl() relies on that. 1098 */ 1099 list_del_init(&p->ctl_entry); 1100 } 1101 1102 void __init sysctl_init(void) 1103 { 1104 #ifdef CONFIG_PROC_FS 1105 register_proc_table(root_table, proc_sys_root, &root_table_header); 1106 init_irq_proc(); 1107 #endif 1108 } 1109 1110 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1111 void __user *newval, size_t newlen) 1112 { 1113 struct list_head *tmp; 1114 int error = -ENOTDIR; 1115 1116 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1117 return -ENOTDIR; 1118 if (oldval) { 1119 int old_len; 1120 if (!oldlenp || get_user(old_len, oldlenp)) 1121 return -EFAULT; 1122 } 1123 spin_lock(&sysctl_lock); 1124 tmp = &root_table_header.ctl_entry; 1125 do { 1126 struct ctl_table_header *head = 1127 list_entry(tmp, struct ctl_table_header, ctl_entry); 1128 void *context = NULL; 1129 1130 if (!use_table(head)) 1131 continue; 1132 1133 spin_unlock(&sysctl_lock); 1134 1135 error = parse_table(name, nlen, oldval, oldlenp, 1136 newval, newlen, head->ctl_table, 1137 &context); 1138 kfree(context); 1139 1140 spin_lock(&sysctl_lock); 1141 unuse_table(head); 1142 if (error != -ENOTDIR) 1143 break; 1144 } while ((tmp = tmp->next) != &root_table_header.ctl_entry); 1145 spin_unlock(&sysctl_lock); 1146 return error; 1147 } 1148 1149 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 1150 { 1151 struct __sysctl_args tmp; 1152 int error; 1153 1154 if (copy_from_user(&tmp, args, sizeof(tmp))) 1155 return -EFAULT; 1156 1157 lock_kernel(); 1158 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1159 tmp.newval, tmp.newlen); 1160 unlock_kernel(); 1161 return error; 1162 } 1163 1164 /* 1165 * ctl_perm does NOT grant the superuser all rights automatically, because 1166 * some sysctl variables are readonly even to root. 1167 */ 1168 1169 static int test_perm(int mode, int op) 1170 { 1171 if (!current->euid) 1172 mode >>= 6; 1173 else if (in_egroup_p(0)) 1174 mode >>= 3; 1175 if ((mode & op & 0007) == op) 1176 return 0; 1177 return -EACCES; 1178 } 1179 1180 static inline int ctl_perm(ctl_table *table, int op) 1181 { 1182 int error; 1183 error = security_sysctl(table, op); 1184 if (error) 1185 return error; 1186 return test_perm(table->mode, op); 1187 } 1188 1189 static int parse_table(int __user *name, int nlen, 1190 void __user *oldval, size_t __user *oldlenp, 1191 void __user *newval, size_t newlen, 1192 ctl_table *table, void **context) 1193 { 1194 int n; 1195 repeat: 1196 if (!nlen) 1197 return -ENOTDIR; 1198 if (get_user(n, name)) 1199 return -EFAULT; 1200 for ( ; table->ctl_name; table++) { 1201 if (n == table->ctl_name || table->ctl_name == CTL_ANY) { 1202 int error; 1203 if (table->child) { 1204 if (ctl_perm(table, 001)) 1205 return -EPERM; 1206 if (table->strategy) { 1207 error = table->strategy( 1208 table, name, nlen, 1209 oldval, oldlenp, 1210 newval, newlen, context); 1211 if (error) 1212 return error; 1213 } 1214 name++; 1215 nlen--; 1216 table = table->child; 1217 goto repeat; 1218 } 1219 error = do_sysctl_strategy(table, name, nlen, 1220 oldval, oldlenp, 1221 newval, newlen, context); 1222 return error; 1223 } 1224 } 1225 return -ENOTDIR; 1226 } 1227 1228 /* Perform the actual read/write of a sysctl table entry. */ 1229 int do_sysctl_strategy (ctl_table *table, 1230 int __user *name, int nlen, 1231 void __user *oldval, size_t __user *oldlenp, 1232 void __user *newval, size_t newlen, void **context) 1233 { 1234 int op = 0, rc; 1235 size_t len; 1236 1237 if (oldval) 1238 op |= 004; 1239 if (newval) 1240 op |= 002; 1241 if (ctl_perm(table, op)) 1242 return -EPERM; 1243 1244 if (table->strategy) { 1245 rc = table->strategy(table, name, nlen, oldval, oldlenp, 1246 newval, newlen, context); 1247 if (rc < 0) 1248 return rc; 1249 if (rc > 0) 1250 return 0; 1251 } 1252 1253 /* If there is no strategy routine, or if the strategy returns 1254 * zero, proceed with automatic r/w */ 1255 if (table->data && table->maxlen) { 1256 if (oldval && oldlenp) { 1257 if (get_user(len, oldlenp)) 1258 return -EFAULT; 1259 if (len) { 1260 if (len > table->maxlen) 1261 len = table->maxlen; 1262 if(copy_to_user(oldval, table->data, len)) 1263 return -EFAULT; 1264 if(put_user(len, oldlenp)) 1265 return -EFAULT; 1266 } 1267 } 1268 if (newval && newlen) { 1269 len = newlen; 1270 if (len > table->maxlen) 1271 len = table->maxlen; 1272 if(copy_from_user(table->data, newval, len)) 1273 return -EFAULT; 1274 } 1275 } 1276 return 0; 1277 } 1278 1279 /** 1280 * register_sysctl_table - register a sysctl hierarchy 1281 * @table: the top-level table structure 1282 * @insert_at_head: whether the entry should be inserted in front or at the end 1283 * 1284 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1285 * array. An entry with a ctl_name of 0 terminates the table. 1286 * 1287 * The members of the &ctl_table structure are used as follows: 1288 * 1289 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1290 * must be unique within that level of sysctl 1291 * 1292 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1293 * enter a sysctl file 1294 * 1295 * data - a pointer to data for use by proc_handler 1296 * 1297 * maxlen - the maximum size in bytes of the data 1298 * 1299 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1300 * 1301 * child - a pointer to the child sysctl table if this entry is a directory, or 1302 * %NULL. 1303 * 1304 * proc_handler - the text handler routine (described below) 1305 * 1306 * strategy - the strategy routine (described below) 1307 * 1308 * de - for internal use by the sysctl routines 1309 * 1310 * extra1, extra2 - extra pointers usable by the proc handler routines 1311 * 1312 * Leaf nodes in the sysctl tree will be represented by a single file 1313 * under /proc; non-leaf nodes will be represented by directories. 1314 * 1315 * sysctl(2) can automatically manage read and write requests through 1316 * the sysctl table. The data and maxlen fields of the ctl_table 1317 * struct enable minimal validation of the values being written to be 1318 * performed, and the mode field allows minimal authentication. 1319 * 1320 * More sophisticated management can be enabled by the provision of a 1321 * strategy routine with the table entry. This will be called before 1322 * any automatic read or write of the data is performed. 1323 * 1324 * The strategy routine may return 1325 * 1326 * < 0 - Error occurred (error is passed to user process) 1327 * 1328 * 0 - OK - proceed with automatic read or write. 1329 * 1330 * > 0 - OK - read or write has been done by the strategy routine, so 1331 * return immediately. 1332 * 1333 * There must be a proc_handler routine for any terminal nodes 1334 * mirrored under /proc/sys (non-terminals are handled by a built-in 1335 * directory handler). Several default handlers are available to 1336 * cover common cases - 1337 * 1338 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1339 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1340 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1341 * 1342 * It is the handler's job to read the input buffer from user memory 1343 * and process it. The handler should return 0 on success. 1344 * 1345 * This routine returns %NULL on a failure to register, and a pointer 1346 * to the table header on success. 1347 */ 1348 struct ctl_table_header *register_sysctl_table(ctl_table * table, 1349 int insert_at_head) 1350 { 1351 struct ctl_table_header *tmp; 1352 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); 1353 if (!tmp) 1354 return NULL; 1355 tmp->ctl_table = table; 1356 INIT_LIST_HEAD(&tmp->ctl_entry); 1357 tmp->used = 0; 1358 tmp->unregistering = NULL; 1359 spin_lock(&sysctl_lock); 1360 if (insert_at_head) 1361 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); 1362 else 1363 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); 1364 spin_unlock(&sysctl_lock); 1365 #ifdef CONFIG_PROC_FS 1366 register_proc_table(table, proc_sys_root, tmp); 1367 #endif 1368 return tmp; 1369 } 1370 1371 /** 1372 * unregister_sysctl_table - unregister a sysctl table hierarchy 1373 * @header: the header returned from register_sysctl_table 1374 * 1375 * Unregisters the sysctl table and all children. proc entries may not 1376 * actually be removed until they are no longer used by anyone. 1377 */ 1378 void unregister_sysctl_table(struct ctl_table_header * header) 1379 { 1380 might_sleep(); 1381 spin_lock(&sysctl_lock); 1382 start_unregistering(header); 1383 #ifdef CONFIG_PROC_FS 1384 unregister_proc_table(header->ctl_table, proc_sys_root); 1385 #endif 1386 spin_unlock(&sysctl_lock); 1387 kfree(header); 1388 } 1389 1390 /* 1391 * /proc/sys support 1392 */ 1393 1394 #ifdef CONFIG_PROC_FS 1395 1396 /* Scan the sysctl entries in table and add them all into /proc */ 1397 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set) 1398 { 1399 struct proc_dir_entry *de; 1400 int len; 1401 mode_t mode; 1402 1403 for (; table->ctl_name; table++) { 1404 /* Can't do anything without a proc name. */ 1405 if (!table->procname) 1406 continue; 1407 /* Maybe we can't do anything with it... */ 1408 if (!table->proc_handler && !table->child) { 1409 printk(KERN_WARNING "SYSCTL: Can't register %s\n", 1410 table->procname); 1411 continue; 1412 } 1413 1414 len = strlen(table->procname); 1415 mode = table->mode; 1416 1417 de = NULL; 1418 if (table->proc_handler) 1419 mode |= S_IFREG; 1420 else { 1421 mode |= S_IFDIR; 1422 for (de = root->subdir; de; de = de->next) { 1423 if (proc_match(len, table->procname, de)) 1424 break; 1425 } 1426 /* If the subdir exists already, de is non-NULL */ 1427 } 1428 1429 if (!de) { 1430 de = create_proc_entry(table->procname, mode, root); 1431 if (!de) 1432 continue; 1433 de->set = set; 1434 de->data = (void *) table; 1435 if (table->proc_handler) 1436 de->proc_fops = &proc_sys_file_operations; 1437 } 1438 table->de = de; 1439 if (de->mode & S_IFDIR) 1440 register_proc_table(table->child, de, set); 1441 } 1442 } 1443 1444 /* 1445 * Unregister a /proc sysctl table and any subdirectories. 1446 */ 1447 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) 1448 { 1449 struct proc_dir_entry *de; 1450 for (; table->ctl_name; table++) { 1451 if (!(de = table->de)) 1452 continue; 1453 if (de->mode & S_IFDIR) { 1454 if (!table->child) { 1455 printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); 1456 continue; 1457 } 1458 unregister_proc_table(table->child, de); 1459 1460 /* Don't unregister directories which still have entries.. */ 1461 if (de->subdir) 1462 continue; 1463 } 1464 1465 /* 1466 * In any case, mark the entry as goner; we'll keep it 1467 * around if it's busy, but we'll know to do nothing with 1468 * its fields. We are under sysctl_lock here. 1469 */ 1470 de->data = NULL; 1471 1472 /* Don't unregister proc entries that are still being used.. */ 1473 if (atomic_read(&de->count)) 1474 continue; 1475 1476 table->de = NULL; 1477 remove_proc_entry(table->procname, root); 1478 } 1479 } 1480 1481 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, 1482 size_t count, loff_t *ppos) 1483 { 1484 int op; 1485 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode); 1486 struct ctl_table *table; 1487 size_t res; 1488 ssize_t error = -ENOTDIR; 1489 1490 spin_lock(&sysctl_lock); 1491 if (de && de->data && use_table(de->set)) { 1492 /* 1493 * at that point we know that sysctl was not unregistered 1494 * and won't be until we finish 1495 */ 1496 spin_unlock(&sysctl_lock); 1497 table = (struct ctl_table *) de->data; 1498 if (!table || !table->proc_handler) 1499 goto out; 1500 error = -EPERM; 1501 op = (write ? 002 : 004); 1502 if (ctl_perm(table, op)) 1503 goto out; 1504 1505 /* careful: calling conventions are nasty here */ 1506 res = count; 1507 error = (*table->proc_handler)(table, write, file, 1508 buf, &res, ppos); 1509 if (!error) 1510 error = res; 1511 out: 1512 spin_lock(&sysctl_lock); 1513 unuse_table(de->set); 1514 } 1515 spin_unlock(&sysctl_lock); 1516 return error; 1517 } 1518 1519 static int proc_opensys(struct inode *inode, struct file *file) 1520 { 1521 if (file->f_mode & FMODE_WRITE) { 1522 /* 1523 * sysctl entries that are not writable, 1524 * are _NOT_ writable, capabilities or not. 1525 */ 1526 if (!(inode->i_mode & S_IWUSR)) 1527 return -EPERM; 1528 } 1529 1530 return 0; 1531 } 1532 1533 static ssize_t proc_readsys(struct file * file, char __user * buf, 1534 size_t count, loff_t *ppos) 1535 { 1536 return do_rw_proc(0, file, buf, count, ppos); 1537 } 1538 1539 static ssize_t proc_writesys(struct file * file, const char __user * buf, 1540 size_t count, loff_t *ppos) 1541 { 1542 return do_rw_proc(1, file, (char __user *) buf, count, ppos); 1543 } 1544 1545 /** 1546 * proc_dostring - read a string sysctl 1547 * @table: the sysctl table 1548 * @write: %TRUE if this is a write to the sysctl file 1549 * @filp: the file structure 1550 * @buffer: the user buffer 1551 * @lenp: the size of the user buffer 1552 * @ppos: file position 1553 * 1554 * Reads/writes a string from/to the user buffer. If the kernel 1555 * buffer provided is not large enough to hold the string, the 1556 * string is truncated. The copied string is %NULL-terminated. 1557 * If the string is being read by the user process, it is copied 1558 * and a newline '\n' is added. It is truncated if the buffer is 1559 * not large enough. 1560 * 1561 * Returns 0 on success. 1562 */ 1563 int proc_dostring(ctl_table *table, int write, struct file *filp, 1564 void __user *buffer, size_t *lenp, loff_t *ppos) 1565 { 1566 size_t len; 1567 char __user *p; 1568 char c; 1569 1570 if (!table->data || !table->maxlen || !*lenp || 1571 (*ppos && !write)) { 1572 *lenp = 0; 1573 return 0; 1574 } 1575 1576 if (write) { 1577 len = 0; 1578 p = buffer; 1579 while (len < *lenp) { 1580 if (get_user(c, p++)) 1581 return -EFAULT; 1582 if (c == 0 || c == '\n') 1583 break; 1584 len++; 1585 } 1586 if (len >= table->maxlen) 1587 len = table->maxlen-1; 1588 if(copy_from_user(table->data, buffer, len)) 1589 return -EFAULT; 1590 ((char *) table->data)[len] = 0; 1591 *ppos += *lenp; 1592 } else { 1593 len = strlen(table->data); 1594 if (len > table->maxlen) 1595 len = table->maxlen; 1596 if (len > *lenp) 1597 len = *lenp; 1598 if (len) 1599 if(copy_to_user(buffer, table->data, len)) 1600 return -EFAULT; 1601 if (len < *lenp) { 1602 if(put_user('\n', ((char __user *) buffer) + len)) 1603 return -EFAULT; 1604 len++; 1605 } 1606 *lenp = len; 1607 *ppos += len; 1608 } 1609 return 0; 1610 } 1611 1612 /* 1613 * Special case of dostring for the UTS structure. This has locks 1614 * to observe. Should this be in kernel/sys.c ???? 1615 */ 1616 1617 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 1618 void __user *buffer, size_t *lenp, loff_t *ppos) 1619 { 1620 int r; 1621 1622 if (!write) { 1623 down_read(&uts_sem); 1624 r=proc_dostring(table,0,filp,buffer,lenp, ppos); 1625 up_read(&uts_sem); 1626 } else { 1627 down_write(&uts_sem); 1628 r=proc_dostring(table,1,filp,buffer,lenp, ppos); 1629 up_write(&uts_sem); 1630 } 1631 return r; 1632 } 1633 1634 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 1635 int *valp, 1636 int write, void *data) 1637 { 1638 if (write) { 1639 *valp = *negp ? -*lvalp : *lvalp; 1640 } else { 1641 int val = *valp; 1642 if (val < 0) { 1643 *negp = -1; 1644 *lvalp = (unsigned long)-val; 1645 } else { 1646 *negp = 0; 1647 *lvalp = (unsigned long)val; 1648 } 1649 } 1650 return 0; 1651 } 1652 1653 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, 1654 void __user *buffer, size_t *lenp, loff_t *ppos, 1655 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 1656 int write, void *data), 1657 void *data) 1658 { 1659 #define TMPBUFLEN 21 1660 int *i, vleft, first=1, neg, val; 1661 unsigned long lval; 1662 size_t left, len; 1663 1664 char buf[TMPBUFLEN], *p; 1665 char __user *s = buffer; 1666 1667 if (!table->data || !table->maxlen || !*lenp || 1668 (*ppos && !write)) { 1669 *lenp = 0; 1670 return 0; 1671 } 1672 1673 i = (int *) table->data; 1674 vleft = table->maxlen / sizeof(*i); 1675 left = *lenp; 1676 1677 if (!conv) 1678 conv = do_proc_dointvec_conv; 1679 1680 for (; left && vleft--; i++, first=0) { 1681 if (write) { 1682 while (left) { 1683 char c; 1684 if (get_user(c, s)) 1685 return -EFAULT; 1686 if (!isspace(c)) 1687 break; 1688 left--; 1689 s++; 1690 } 1691 if (!left) 1692 break; 1693 neg = 0; 1694 len = left; 1695 if (len > sizeof(buf) - 1) 1696 len = sizeof(buf) - 1; 1697 if (copy_from_user(buf, s, len)) 1698 return -EFAULT; 1699 buf[len] = 0; 1700 p = buf; 1701 if (*p == '-' && left > 1) { 1702 neg = 1; 1703 left--, p++; 1704 } 1705 if (*p < '0' || *p > '9') 1706 break; 1707 1708 lval = simple_strtoul(p, &p, 0); 1709 1710 len = p-buf; 1711 if ((len < left) && *p && !isspace(*p)) 1712 break; 1713 if (neg) 1714 val = -val; 1715 s += len; 1716 left -= len; 1717 1718 if (conv(&neg, &lval, i, 1, data)) 1719 break; 1720 } else { 1721 p = buf; 1722 if (!first) 1723 *p++ = '\t'; 1724 1725 if (conv(&neg, &lval, i, 0, data)) 1726 break; 1727 1728 sprintf(p, "%s%lu", neg ? "-" : "", lval); 1729 len = strlen(buf); 1730 if (len > left) 1731 len = left; 1732 if(copy_to_user(s, buf, len)) 1733 return -EFAULT; 1734 left -= len; 1735 s += len; 1736 } 1737 } 1738 1739 if (!write && !first && left) { 1740 if(put_user('\n', s)) 1741 return -EFAULT; 1742 left--, s++; 1743 } 1744 if (write) { 1745 while (left) { 1746 char c; 1747 if (get_user(c, s++)) 1748 return -EFAULT; 1749 if (!isspace(c)) 1750 break; 1751 left--; 1752 } 1753 } 1754 if (write && first) 1755 return -EINVAL; 1756 *lenp -= left; 1757 *ppos += *lenp; 1758 return 0; 1759 #undef TMPBUFLEN 1760 } 1761 1762 /** 1763 * proc_dointvec - read a vector of integers 1764 * @table: the sysctl table 1765 * @write: %TRUE if this is a write to the sysctl file 1766 * @filp: the file structure 1767 * @buffer: the user buffer 1768 * @lenp: the size of the user buffer 1769 * @ppos: file position 1770 * 1771 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1772 * values from/to the user buffer, treated as an ASCII string. 1773 * 1774 * Returns 0 on success. 1775 */ 1776 int proc_dointvec(ctl_table *table, int write, struct file *filp, 1777 void __user *buffer, size_t *lenp, loff_t *ppos) 1778 { 1779 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1780 NULL,NULL); 1781 } 1782 1783 #define OP_SET 0 1784 #define OP_AND 1 1785 #define OP_OR 2 1786 #define OP_MAX 3 1787 #define OP_MIN 4 1788 1789 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, 1790 int *valp, 1791 int write, void *data) 1792 { 1793 int op = *(int *)data; 1794 if (write) { 1795 int val = *negp ? -*lvalp : *lvalp; 1796 switch(op) { 1797 case OP_SET: *valp = val; break; 1798 case OP_AND: *valp &= val; break; 1799 case OP_OR: *valp |= val; break; 1800 case OP_MAX: if(*valp < val) 1801 *valp = val; 1802 break; 1803 case OP_MIN: if(*valp > val) 1804 *valp = val; 1805 break; 1806 } 1807 } else { 1808 int val = *valp; 1809 if (val < 0) { 1810 *negp = -1; 1811 *lvalp = (unsigned long)-val; 1812 } else { 1813 *negp = 0; 1814 *lvalp = (unsigned long)val; 1815 } 1816 } 1817 return 0; 1818 } 1819 1820 /* 1821 * init may raise the set. 1822 */ 1823 1824 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 1825 void __user *buffer, size_t *lenp, loff_t *ppos) 1826 { 1827 int op; 1828 1829 if (!capable(CAP_SYS_MODULE)) { 1830 return -EPERM; 1831 } 1832 1833 op = (current->pid == 1) ? OP_SET : OP_AND; 1834 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1835 do_proc_dointvec_bset_conv,&op); 1836 } 1837 1838 struct do_proc_dointvec_minmax_conv_param { 1839 int *min; 1840 int *max; 1841 }; 1842 1843 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 1844 int *valp, 1845 int write, void *data) 1846 { 1847 struct do_proc_dointvec_minmax_conv_param *param = data; 1848 if (write) { 1849 int val = *negp ? -*lvalp : *lvalp; 1850 if ((param->min && *param->min > val) || 1851 (param->max && *param->max < val)) 1852 return -EINVAL; 1853 *valp = val; 1854 } else { 1855 int val = *valp; 1856 if (val < 0) { 1857 *negp = -1; 1858 *lvalp = (unsigned long)-val; 1859 } else { 1860 *negp = 0; 1861 *lvalp = (unsigned long)val; 1862 } 1863 } 1864 return 0; 1865 } 1866 1867 /** 1868 * proc_dointvec_minmax - read a vector of integers with min/max values 1869 * @table: the sysctl table 1870 * @write: %TRUE if this is a write to the sysctl file 1871 * @filp: the file structure 1872 * @buffer: the user buffer 1873 * @lenp: the size of the user buffer 1874 * @ppos: file position 1875 * 1876 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1877 * values from/to the user buffer, treated as an ASCII string. 1878 * 1879 * This routine will ensure the values are within the range specified by 1880 * table->extra1 (min) and table->extra2 (max). 1881 * 1882 * Returns 0 on success. 1883 */ 1884 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 1885 void __user *buffer, size_t *lenp, loff_t *ppos) 1886 { 1887 struct do_proc_dointvec_minmax_conv_param param = { 1888 .min = (int *) table->extra1, 1889 .max = (int *) table->extra2, 1890 }; 1891 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 1892 do_proc_dointvec_minmax_conv, ¶m); 1893 } 1894 1895 static int do_proc_doulongvec_minmax(ctl_table *table, int write, 1896 struct file *filp, 1897 void __user *buffer, 1898 size_t *lenp, loff_t *ppos, 1899 unsigned long convmul, 1900 unsigned long convdiv) 1901 { 1902 #define TMPBUFLEN 21 1903 unsigned long *i, *min, *max, val; 1904 int vleft, first=1, neg; 1905 size_t len, left; 1906 char buf[TMPBUFLEN], *p; 1907 char __user *s = buffer; 1908 1909 if (!table->data || !table->maxlen || !*lenp || 1910 (*ppos && !write)) { 1911 *lenp = 0; 1912 return 0; 1913 } 1914 1915 i = (unsigned long *) table->data; 1916 min = (unsigned long *) table->extra1; 1917 max = (unsigned long *) table->extra2; 1918 vleft = table->maxlen / sizeof(unsigned long); 1919 left = *lenp; 1920 1921 for (; left && vleft--; i++, min++, max++, first=0) { 1922 if (write) { 1923 while (left) { 1924 char c; 1925 if (get_user(c, s)) 1926 return -EFAULT; 1927 if (!isspace(c)) 1928 break; 1929 left--; 1930 s++; 1931 } 1932 if (!left) 1933 break; 1934 neg = 0; 1935 len = left; 1936 if (len > TMPBUFLEN-1) 1937 len = TMPBUFLEN-1; 1938 if (copy_from_user(buf, s, len)) 1939 return -EFAULT; 1940 buf[len] = 0; 1941 p = buf; 1942 if (*p == '-' && left > 1) { 1943 neg = 1; 1944 left--, p++; 1945 } 1946 if (*p < '0' || *p > '9') 1947 break; 1948 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 1949 len = p-buf; 1950 if ((len < left) && *p && !isspace(*p)) 1951 break; 1952 if (neg) 1953 val = -val; 1954 s += len; 1955 left -= len; 1956 1957 if(neg) 1958 continue; 1959 if ((min && val < *min) || (max && val > *max)) 1960 continue; 1961 *i = val; 1962 } else { 1963 p = buf; 1964 if (!first) 1965 *p++ = '\t'; 1966 sprintf(p, "%lu", convdiv * (*i) / convmul); 1967 len = strlen(buf); 1968 if (len > left) 1969 len = left; 1970 if(copy_to_user(s, buf, len)) 1971 return -EFAULT; 1972 left -= len; 1973 s += len; 1974 } 1975 } 1976 1977 if (!write && !first && left) { 1978 if(put_user('\n', s)) 1979 return -EFAULT; 1980 left--, s++; 1981 } 1982 if (write) { 1983 while (left) { 1984 char c; 1985 if (get_user(c, s++)) 1986 return -EFAULT; 1987 if (!isspace(c)) 1988 break; 1989 left--; 1990 } 1991 } 1992 if (write && first) 1993 return -EINVAL; 1994 *lenp -= left; 1995 *ppos += *lenp; 1996 return 0; 1997 #undef TMPBUFLEN 1998 } 1999 2000 /** 2001 * proc_doulongvec_minmax - read a vector of long integers with min/max values 2002 * @table: the sysctl table 2003 * @write: %TRUE if this is a write to the sysctl file 2004 * @filp: the file structure 2005 * @buffer: the user buffer 2006 * @lenp: the size of the user buffer 2007 * @ppos: file position 2008 * 2009 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2010 * values from/to the user buffer, treated as an ASCII string. 2011 * 2012 * This routine will ensure the values are within the range specified by 2013 * table->extra1 (min) and table->extra2 (max). 2014 * 2015 * Returns 0 on success. 2016 */ 2017 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2018 void __user *buffer, size_t *lenp, loff_t *ppos) 2019 { 2020 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 2021 } 2022 2023 /** 2024 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 2025 * @table: the sysctl table 2026 * @write: %TRUE if this is a write to the sysctl file 2027 * @filp: the file structure 2028 * @buffer: the user buffer 2029 * @lenp: the size of the user buffer 2030 * @ppos: file position 2031 * 2032 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 2033 * values from/to the user buffer, treated as an ASCII string. The values 2034 * are treated as milliseconds, and converted to jiffies when they are stored. 2035 * 2036 * This routine will ensure the values are within the range specified by 2037 * table->extra1 (min) and table->extra2 (max). 2038 * 2039 * Returns 0 on success. 2040 */ 2041 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2042 struct file *filp, 2043 void __user *buffer, 2044 size_t *lenp, loff_t *ppos) 2045 { 2046 return do_proc_doulongvec_minmax(table, write, filp, buffer, 2047 lenp, ppos, HZ, 1000l); 2048 } 2049 2050 2051 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 2052 int *valp, 2053 int write, void *data) 2054 { 2055 if (write) { 2056 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 2057 } else { 2058 int val = *valp; 2059 unsigned long lval; 2060 if (val < 0) { 2061 *negp = -1; 2062 lval = (unsigned long)-val; 2063 } else { 2064 *negp = 0; 2065 lval = (unsigned long)val; 2066 } 2067 *lvalp = lval / HZ; 2068 } 2069 return 0; 2070 } 2071 2072 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 2073 int *valp, 2074 int write, void *data) 2075 { 2076 if (write) { 2077 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 2078 } else { 2079 int val = *valp; 2080 unsigned long lval; 2081 if (val < 0) { 2082 *negp = -1; 2083 lval = (unsigned long)-val; 2084 } else { 2085 *negp = 0; 2086 lval = (unsigned long)val; 2087 } 2088 *lvalp = jiffies_to_clock_t(lval); 2089 } 2090 return 0; 2091 } 2092 2093 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 2094 int *valp, 2095 int write, void *data) 2096 { 2097 if (write) { 2098 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 2099 } else { 2100 int val = *valp; 2101 unsigned long lval; 2102 if (val < 0) { 2103 *negp = -1; 2104 lval = (unsigned long)-val; 2105 } else { 2106 *negp = 0; 2107 lval = (unsigned long)val; 2108 } 2109 *lvalp = jiffies_to_msecs(lval); 2110 } 2111 return 0; 2112 } 2113 2114 /** 2115 * proc_dointvec_jiffies - read a vector of integers as seconds 2116 * @table: the sysctl table 2117 * @write: %TRUE if this is a write to the sysctl file 2118 * @filp: the file structure 2119 * @buffer: the user buffer 2120 * @lenp: the size of the user buffer 2121 * @ppos: file position 2122 * 2123 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2124 * values from/to the user buffer, treated as an ASCII string. 2125 * The values read are assumed to be in seconds, and are converted into 2126 * jiffies. 2127 * 2128 * Returns 0 on success. 2129 */ 2130 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2131 void __user *buffer, size_t *lenp, loff_t *ppos) 2132 { 2133 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2134 do_proc_dointvec_jiffies_conv,NULL); 2135 } 2136 2137 /** 2138 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 2139 * @table: the sysctl table 2140 * @write: %TRUE if this is a write to the sysctl file 2141 * @filp: the file structure 2142 * @buffer: the user buffer 2143 * @lenp: the size of the user buffer 2144 * @ppos: pointer to the file position 2145 * 2146 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2147 * values from/to the user buffer, treated as an ASCII string. 2148 * The values read are assumed to be in 1/USER_HZ seconds, and 2149 * are converted into jiffies. 2150 * 2151 * Returns 0 on success. 2152 */ 2153 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2154 void __user *buffer, size_t *lenp, loff_t *ppos) 2155 { 2156 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2157 do_proc_dointvec_userhz_jiffies_conv,NULL); 2158 } 2159 2160 /** 2161 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2162 * @table: the sysctl table 2163 * @write: %TRUE if this is a write to the sysctl file 2164 * @filp: the file structure 2165 * @buffer: the user buffer 2166 * @lenp: the size of the user buffer 2167 * @ppos: file position 2168 * @ppos: the current position in the file 2169 * 2170 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2171 * values from/to the user buffer, treated as an ASCII string. 2172 * The values read are assumed to be in 1/1000 seconds, and 2173 * are converted into jiffies. 2174 * 2175 * Returns 0 on success. 2176 */ 2177 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2178 void __user *buffer, size_t *lenp, loff_t *ppos) 2179 { 2180 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2181 do_proc_dointvec_ms_jiffies_conv, NULL); 2182 } 2183 2184 #else /* CONFIG_PROC_FS */ 2185 2186 int proc_dostring(ctl_table *table, int write, struct file *filp, 2187 void __user *buffer, size_t *lenp, loff_t *ppos) 2188 { 2189 return -ENOSYS; 2190 } 2191 2192 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 2193 void __user *buffer, size_t *lenp, loff_t *ppos) 2194 { 2195 return -ENOSYS; 2196 } 2197 2198 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2199 void __user *buffer, size_t *lenp, loff_t *ppos) 2200 { 2201 return -ENOSYS; 2202 } 2203 2204 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2205 void __user *buffer, size_t *lenp, loff_t *ppos) 2206 { 2207 return -ENOSYS; 2208 } 2209 2210 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2211 void __user *buffer, size_t *lenp, loff_t *ppos) 2212 { 2213 return -ENOSYS; 2214 } 2215 2216 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2217 void __user *buffer, size_t *lenp, loff_t *ppos) 2218 { 2219 return -ENOSYS; 2220 } 2221 2222 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2223 void __user *buffer, size_t *lenp, loff_t *ppos) 2224 { 2225 return -ENOSYS; 2226 } 2227 2228 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2229 void __user *buffer, size_t *lenp, loff_t *ppos) 2230 { 2231 return -ENOSYS; 2232 } 2233 2234 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2235 void __user *buffer, size_t *lenp, loff_t *ppos) 2236 { 2237 return -ENOSYS; 2238 } 2239 2240 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2241 struct file *filp, 2242 void __user *buffer, 2243 size_t *lenp, loff_t *ppos) 2244 { 2245 return -ENOSYS; 2246 } 2247 2248 2249 #endif /* CONFIG_PROC_FS */ 2250 2251 2252 /* 2253 * General sysctl support routines 2254 */ 2255 2256 /* The generic string strategy routine: */ 2257 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2258 void __user *oldval, size_t __user *oldlenp, 2259 void __user *newval, size_t newlen, void **context) 2260 { 2261 if (!table->data || !table->maxlen) 2262 return -ENOTDIR; 2263 2264 if (oldval && oldlenp) { 2265 size_t bufsize; 2266 if (get_user(bufsize, oldlenp)) 2267 return -EFAULT; 2268 if (bufsize) { 2269 size_t len = strlen(table->data), copied; 2270 2271 /* This shouldn't trigger for a well-formed sysctl */ 2272 if (len > table->maxlen) 2273 len = table->maxlen; 2274 2275 /* Copy up to a max of bufsize-1 bytes of the string */ 2276 copied = (len >= bufsize) ? bufsize - 1 : len; 2277 2278 if (copy_to_user(oldval, table->data, copied) || 2279 put_user(0, (char __user *)(oldval + copied))) 2280 return -EFAULT; 2281 if (put_user(len, oldlenp)) 2282 return -EFAULT; 2283 } 2284 } 2285 if (newval && newlen) { 2286 size_t len = newlen; 2287 if (len > table->maxlen) 2288 len = table->maxlen; 2289 if(copy_from_user(table->data, newval, len)) 2290 return -EFAULT; 2291 if (len == table->maxlen) 2292 len--; 2293 ((char *) table->data)[len] = 0; 2294 } 2295 return 1; 2296 } 2297 2298 /* 2299 * This function makes sure that all of the integers in the vector 2300 * are between the minimum and maximum values given in the arrays 2301 * table->extra1 and table->extra2, respectively. 2302 */ 2303 int sysctl_intvec(ctl_table *table, int __user *name, int nlen, 2304 void __user *oldval, size_t __user *oldlenp, 2305 void __user *newval, size_t newlen, void **context) 2306 { 2307 2308 if (newval && newlen) { 2309 int __user *vec = (int __user *) newval; 2310 int *min = (int *) table->extra1; 2311 int *max = (int *) table->extra2; 2312 size_t length; 2313 int i; 2314 2315 if (newlen % sizeof(int) != 0) 2316 return -EINVAL; 2317 2318 if (!table->extra1 && !table->extra2) 2319 return 0; 2320 2321 if (newlen > table->maxlen) 2322 newlen = table->maxlen; 2323 length = newlen / sizeof(int); 2324 2325 for (i = 0; i < length; i++) { 2326 int value; 2327 if (get_user(value, vec + i)) 2328 return -EFAULT; 2329 if (min && value < min[i]) 2330 return -EINVAL; 2331 if (max && value > max[i]) 2332 return -EINVAL; 2333 } 2334 } 2335 return 0; 2336 } 2337 2338 /* Strategy function to convert jiffies to seconds */ 2339 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2340 void __user *oldval, size_t __user *oldlenp, 2341 void __user *newval, size_t newlen, void **context) 2342 { 2343 if (oldval) { 2344 size_t olen; 2345 if (oldlenp) { 2346 if (get_user(olen, oldlenp)) 2347 return -EFAULT; 2348 if (olen!=sizeof(int)) 2349 return -EINVAL; 2350 } 2351 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || 2352 (oldlenp && put_user(sizeof(int),oldlenp))) 2353 return -EFAULT; 2354 } 2355 if (newval && newlen) { 2356 int new; 2357 if (newlen != sizeof(int)) 2358 return -EINVAL; 2359 if (get_user(new, (int __user *)newval)) 2360 return -EFAULT; 2361 *(int *)(table->data) = new*HZ; 2362 } 2363 return 1; 2364 } 2365 2366 /* Strategy function to convert jiffies to seconds */ 2367 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2368 void __user *oldval, size_t __user *oldlenp, 2369 void __user *newval, size_t newlen, void **context) 2370 { 2371 if (oldval) { 2372 size_t olen; 2373 if (oldlenp) { 2374 if (get_user(olen, oldlenp)) 2375 return -EFAULT; 2376 if (olen!=sizeof(int)) 2377 return -EINVAL; 2378 } 2379 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || 2380 (oldlenp && put_user(sizeof(int),oldlenp))) 2381 return -EFAULT; 2382 } 2383 if (newval && newlen) { 2384 int new; 2385 if (newlen != sizeof(int)) 2386 return -EINVAL; 2387 if (get_user(new, (int __user *)newval)) 2388 return -EFAULT; 2389 *(int *)(table->data) = msecs_to_jiffies(new); 2390 } 2391 return 1; 2392 } 2393 2394 #else /* CONFIG_SYSCTL */ 2395 2396 2397 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 2398 { 2399 return -ENOSYS; 2400 } 2401 2402 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2403 void __user *oldval, size_t __user *oldlenp, 2404 void __user *newval, size_t newlen, void **context) 2405 { 2406 return -ENOSYS; 2407 } 2408 2409 int sysctl_intvec(ctl_table *table, int __user *name, int nlen, 2410 void __user *oldval, size_t __user *oldlenp, 2411 void __user *newval, size_t newlen, void **context) 2412 { 2413 return -ENOSYS; 2414 } 2415 2416 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2417 void __user *oldval, size_t __user *oldlenp, 2418 void __user *newval, size_t newlen, void **context) 2419 { 2420 return -ENOSYS; 2421 } 2422 2423 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2424 void __user *oldval, size_t __user *oldlenp, 2425 void __user *newval, size_t newlen, void **context) 2426 { 2427 return -ENOSYS; 2428 } 2429 2430 int proc_dostring(ctl_table *table, int write, struct file *filp, 2431 void __user *buffer, size_t *lenp, loff_t *ppos) 2432 { 2433 return -ENOSYS; 2434 } 2435 2436 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2437 void __user *buffer, size_t *lenp, loff_t *ppos) 2438 { 2439 return -ENOSYS; 2440 } 2441 2442 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2443 void __user *buffer, size_t *lenp, loff_t *ppos) 2444 { 2445 return -ENOSYS; 2446 } 2447 2448 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2449 void __user *buffer, size_t *lenp, loff_t *ppos) 2450 { 2451 return -ENOSYS; 2452 } 2453 2454 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2455 void __user *buffer, size_t *lenp, loff_t *ppos) 2456 { 2457 return -ENOSYS; 2458 } 2459 2460 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2461 void __user *buffer, size_t *lenp, loff_t *ppos) 2462 { 2463 return -ENOSYS; 2464 } 2465 2466 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2467 void __user *buffer, size_t *lenp, loff_t *ppos) 2468 { 2469 return -ENOSYS; 2470 } 2471 2472 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2473 void __user *buffer, size_t *lenp, loff_t *ppos) 2474 { 2475 return -ENOSYS; 2476 } 2477 2478 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2479 struct file *filp, 2480 void __user *buffer, 2481 size_t *lenp, loff_t *ppos) 2482 { 2483 return -ENOSYS; 2484 } 2485 2486 struct ctl_table_header * register_sysctl_table(ctl_table * table, 2487 int insert_at_head) 2488 { 2489 return NULL; 2490 } 2491 2492 void unregister_sysctl_table(struct ctl_table_header * table) 2493 { 2494 } 2495 2496 #endif /* CONFIG_SYSCTL */ 2497 2498 /* 2499 * No sense putting this after each symbol definition, twice, 2500 * exception granted :-) 2501 */ 2502 EXPORT_SYMBOL(proc_dointvec); 2503 EXPORT_SYMBOL(proc_dointvec_jiffies); 2504 EXPORT_SYMBOL(proc_dointvec_minmax); 2505 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2506 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2507 EXPORT_SYMBOL(proc_dostring); 2508 EXPORT_SYMBOL(proc_doulongvec_minmax); 2509 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2510 EXPORT_SYMBOL(register_sysctl_table); 2511 EXPORT_SYMBOL(sysctl_intvec); 2512 EXPORT_SYMBOL(sysctl_jiffies); 2513 EXPORT_SYMBOL(sysctl_ms_jiffies); 2514 EXPORT_SYMBOL(sysctl_string); 2515 EXPORT_SYMBOL(unregister_sysctl_table); 2516