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/ctype.h> 29 #include <linux/utsname.h> 30 #include <linux/capability.h> 31 #include <linux/smp_lock.h> 32 #include <linux/init.h> 33 #include <linux/kernel.h> 34 #include <linux/net.h> 35 #include <linux/sysrq.h> 36 #include <linux/highuid.h> 37 #include <linux/writeback.h> 38 #include <linux/hugetlb.h> 39 #include <linux/security.h> 40 #include <linux/initrd.h> 41 #include <linux/times.h> 42 #include <linux/limits.h> 43 #include <linux/dcache.h> 44 #include <linux/syscalls.h> 45 46 #include <asm/uaccess.h> 47 #include <asm/processor.h> 48 49 #ifdef CONFIG_ROOT_NFS 50 #include <linux/nfs_fs.h> 51 #endif 52 53 #if defined(CONFIG_SYSCTL) 54 55 /* External variables not in a header file. */ 56 extern int C_A_D; 57 extern int sysctl_overcommit_memory; 58 extern int sysctl_overcommit_ratio; 59 extern int max_threads; 60 extern int sysrq_enabled; 61 extern int core_uses_pid; 62 extern int suid_dumpable; 63 extern char core_pattern[]; 64 extern int cad_pid; 65 extern int pid_max; 66 extern int min_free_kbytes; 67 extern int printk_ratelimit_jiffies; 68 extern int printk_ratelimit_burst; 69 extern int pid_max_min, pid_max_max; 70 71 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 72 int unknown_nmi_panic; 73 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *, 74 void __user *, size_t *, loff_t *); 75 #endif 76 77 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ 78 static int maxolduid = 65535; 79 static int minolduid; 80 81 static int ngroups_max = NGROUPS_MAX; 82 83 #ifdef CONFIG_KMOD 84 extern char modprobe_path[]; 85 #endif 86 #ifdef CONFIG_HOTPLUG 87 extern char hotplug_path[]; 88 #endif 89 #ifdef CONFIG_CHR_DEV_SG 90 extern int sg_big_buff; 91 #endif 92 #ifdef CONFIG_SYSVIPC 93 extern size_t shm_ctlmax; 94 extern size_t shm_ctlall; 95 extern int shm_ctlmni; 96 extern int msg_ctlmax; 97 extern int msg_ctlmnb; 98 extern int msg_ctlmni; 99 extern int sem_ctls[]; 100 #endif 101 102 #ifdef __sparc__ 103 extern char reboot_command []; 104 extern int stop_a_enabled; 105 extern int scons_pwroff; 106 #endif 107 108 #ifdef __hppa__ 109 extern int pwrsw_enabled; 110 extern int unaligned_enabled; 111 #endif 112 113 #ifdef CONFIG_ARCH_S390 114 #ifdef CONFIG_MATHEMU 115 extern int sysctl_ieee_emulation_warnings; 116 #endif 117 extern int sysctl_userprocess_debug; 118 extern int spin_retry; 119 #endif 120 121 extern int sysctl_hz_timer; 122 123 #ifdef CONFIG_BSD_PROCESS_ACCT 124 extern int acct_parm[]; 125 #endif 126 127 int randomize_va_space = 1; 128 129 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t, 130 ctl_table *, void **); 131 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 132 void __user *buffer, size_t *lenp, loff_t *ppos); 133 134 static ctl_table root_table[]; 135 static struct ctl_table_header root_table_header = 136 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; 137 138 static ctl_table kern_table[]; 139 static ctl_table vm_table[]; 140 static ctl_table proc_table[]; 141 static ctl_table fs_table[]; 142 static ctl_table debug_table[]; 143 static ctl_table dev_table[]; 144 extern ctl_table random_table[]; 145 #ifdef CONFIG_UNIX98_PTYS 146 extern ctl_table pty_table[]; 147 #endif 148 #ifdef CONFIG_INOTIFY 149 extern ctl_table inotify_table[]; 150 #endif 151 152 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 153 int sysctl_legacy_va_layout; 154 #endif 155 156 /* /proc declarations: */ 157 158 #ifdef CONFIG_PROC_FS 159 160 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *); 161 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *); 162 static int proc_opensys(struct inode *, struct file *); 163 164 struct file_operations proc_sys_file_operations = { 165 .open = proc_opensys, 166 .read = proc_readsys, 167 .write = proc_writesys, 168 }; 169 170 extern struct proc_dir_entry *proc_sys_root; 171 172 static void register_proc_table(ctl_table *, struct proc_dir_entry *); 173 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); 174 #endif 175 176 /* The default sysctl tables: */ 177 178 static ctl_table root_table[] = { 179 { 180 .ctl_name = CTL_KERN, 181 .procname = "kernel", 182 .mode = 0555, 183 .child = kern_table, 184 }, 185 { 186 .ctl_name = CTL_VM, 187 .procname = "vm", 188 .mode = 0555, 189 .child = vm_table, 190 }, 191 #ifdef CONFIG_NET 192 { 193 .ctl_name = CTL_NET, 194 .procname = "net", 195 .mode = 0555, 196 .child = net_table, 197 }, 198 #endif 199 { 200 .ctl_name = CTL_PROC, 201 .procname = "proc", 202 .mode = 0555, 203 .child = proc_table, 204 }, 205 { 206 .ctl_name = CTL_FS, 207 .procname = "fs", 208 .mode = 0555, 209 .child = fs_table, 210 }, 211 { 212 .ctl_name = CTL_DEBUG, 213 .procname = "debug", 214 .mode = 0555, 215 .child = debug_table, 216 }, 217 { 218 .ctl_name = CTL_DEV, 219 .procname = "dev", 220 .mode = 0555, 221 .child = dev_table, 222 }, 223 224 { .ctl_name = 0 } 225 }; 226 227 static ctl_table kern_table[] = { 228 { 229 .ctl_name = KERN_OSTYPE, 230 .procname = "ostype", 231 .data = system_utsname.sysname, 232 .maxlen = sizeof(system_utsname.sysname), 233 .mode = 0444, 234 .proc_handler = &proc_doutsstring, 235 .strategy = &sysctl_string, 236 }, 237 { 238 .ctl_name = KERN_OSRELEASE, 239 .procname = "osrelease", 240 .data = system_utsname.release, 241 .maxlen = sizeof(system_utsname.release), 242 .mode = 0444, 243 .proc_handler = &proc_doutsstring, 244 .strategy = &sysctl_string, 245 }, 246 { 247 .ctl_name = KERN_VERSION, 248 .procname = "version", 249 .data = system_utsname.version, 250 .maxlen = sizeof(system_utsname.version), 251 .mode = 0444, 252 .proc_handler = &proc_doutsstring, 253 .strategy = &sysctl_string, 254 }, 255 { 256 .ctl_name = KERN_NODENAME, 257 .procname = "hostname", 258 .data = system_utsname.nodename, 259 .maxlen = sizeof(system_utsname.nodename), 260 .mode = 0644, 261 .proc_handler = &proc_doutsstring, 262 .strategy = &sysctl_string, 263 }, 264 { 265 .ctl_name = KERN_DOMAINNAME, 266 .procname = "domainname", 267 .data = system_utsname.domainname, 268 .maxlen = sizeof(system_utsname.domainname), 269 .mode = 0644, 270 .proc_handler = &proc_doutsstring, 271 .strategy = &sysctl_string, 272 }, 273 { 274 .ctl_name = KERN_PANIC, 275 .procname = "panic", 276 .data = &panic_timeout, 277 .maxlen = sizeof(int), 278 .mode = 0644, 279 .proc_handler = &proc_dointvec, 280 }, 281 { 282 .ctl_name = KERN_CORE_USES_PID, 283 .procname = "core_uses_pid", 284 .data = &core_uses_pid, 285 .maxlen = sizeof(int), 286 .mode = 0644, 287 .proc_handler = &proc_dointvec, 288 }, 289 { 290 .ctl_name = KERN_CORE_PATTERN, 291 .procname = "core_pattern", 292 .data = core_pattern, 293 .maxlen = 64, 294 .mode = 0644, 295 .proc_handler = &proc_dostring, 296 .strategy = &sysctl_string, 297 }, 298 { 299 .ctl_name = KERN_TAINTED, 300 .procname = "tainted", 301 .data = &tainted, 302 .maxlen = sizeof(int), 303 .mode = 0444, 304 .proc_handler = &proc_dointvec, 305 }, 306 { 307 .ctl_name = KERN_CAP_BSET, 308 .procname = "cap-bound", 309 .data = &cap_bset, 310 .maxlen = sizeof(kernel_cap_t), 311 .mode = 0600, 312 .proc_handler = &proc_dointvec_bset, 313 }, 314 #ifdef CONFIG_BLK_DEV_INITRD 315 { 316 .ctl_name = KERN_REALROOTDEV, 317 .procname = "real-root-dev", 318 .data = &real_root_dev, 319 .maxlen = sizeof(int), 320 .mode = 0644, 321 .proc_handler = &proc_dointvec, 322 }, 323 #endif 324 #ifdef __sparc__ 325 { 326 .ctl_name = KERN_SPARC_REBOOT, 327 .procname = "reboot-cmd", 328 .data = reboot_command, 329 .maxlen = 256, 330 .mode = 0644, 331 .proc_handler = &proc_dostring, 332 .strategy = &sysctl_string, 333 }, 334 { 335 .ctl_name = KERN_SPARC_STOP_A, 336 .procname = "stop-a", 337 .data = &stop_a_enabled, 338 .maxlen = sizeof (int), 339 .mode = 0644, 340 .proc_handler = &proc_dointvec, 341 }, 342 { 343 .ctl_name = KERN_SPARC_SCONS_PWROFF, 344 .procname = "scons-poweroff", 345 .data = &scons_pwroff, 346 .maxlen = sizeof (int), 347 .mode = 0644, 348 .proc_handler = &proc_dointvec, 349 }, 350 #endif 351 #ifdef __hppa__ 352 { 353 .ctl_name = KERN_HPPA_PWRSW, 354 .procname = "soft-power", 355 .data = &pwrsw_enabled, 356 .maxlen = sizeof (int), 357 .mode = 0644, 358 .proc_handler = &proc_dointvec, 359 }, 360 { 361 .ctl_name = KERN_HPPA_UNALIGNED, 362 .procname = "unaligned-trap", 363 .data = &unaligned_enabled, 364 .maxlen = sizeof (int), 365 .mode = 0644, 366 .proc_handler = &proc_dointvec, 367 }, 368 #endif 369 { 370 .ctl_name = KERN_CTLALTDEL, 371 .procname = "ctrl-alt-del", 372 .data = &C_A_D, 373 .maxlen = sizeof(int), 374 .mode = 0644, 375 .proc_handler = &proc_dointvec, 376 }, 377 { 378 .ctl_name = KERN_PRINTK, 379 .procname = "printk", 380 .data = &console_loglevel, 381 .maxlen = 4*sizeof(int), 382 .mode = 0644, 383 .proc_handler = &proc_dointvec, 384 }, 385 #ifdef CONFIG_KMOD 386 { 387 .ctl_name = KERN_MODPROBE, 388 .procname = "modprobe", 389 .data = &modprobe_path, 390 .maxlen = KMOD_PATH_LEN, 391 .mode = 0644, 392 .proc_handler = &proc_dostring, 393 .strategy = &sysctl_string, 394 }, 395 #endif 396 #ifdef CONFIG_HOTPLUG 397 { 398 .ctl_name = KERN_HOTPLUG, 399 .procname = "hotplug", 400 .data = &hotplug_path, 401 .maxlen = HOTPLUG_PATH_LEN, 402 .mode = 0644, 403 .proc_handler = &proc_dostring, 404 .strategy = &sysctl_string, 405 }, 406 #endif 407 #ifdef CONFIG_CHR_DEV_SG 408 { 409 .ctl_name = KERN_SG_BIG_BUFF, 410 .procname = "sg-big-buff", 411 .data = &sg_big_buff, 412 .maxlen = sizeof (int), 413 .mode = 0444, 414 .proc_handler = &proc_dointvec, 415 }, 416 #endif 417 #ifdef CONFIG_BSD_PROCESS_ACCT 418 { 419 .ctl_name = KERN_ACCT, 420 .procname = "acct", 421 .data = &acct_parm, 422 .maxlen = 3*sizeof(int), 423 .mode = 0644, 424 .proc_handler = &proc_dointvec, 425 }, 426 #endif 427 #ifdef CONFIG_SYSVIPC 428 { 429 .ctl_name = KERN_SHMMAX, 430 .procname = "shmmax", 431 .data = &shm_ctlmax, 432 .maxlen = sizeof (size_t), 433 .mode = 0644, 434 .proc_handler = &proc_doulongvec_minmax, 435 }, 436 { 437 .ctl_name = KERN_SHMALL, 438 .procname = "shmall", 439 .data = &shm_ctlall, 440 .maxlen = sizeof (size_t), 441 .mode = 0644, 442 .proc_handler = &proc_doulongvec_minmax, 443 }, 444 { 445 .ctl_name = KERN_SHMMNI, 446 .procname = "shmmni", 447 .data = &shm_ctlmni, 448 .maxlen = sizeof (int), 449 .mode = 0644, 450 .proc_handler = &proc_dointvec, 451 }, 452 { 453 .ctl_name = KERN_MSGMAX, 454 .procname = "msgmax", 455 .data = &msg_ctlmax, 456 .maxlen = sizeof (int), 457 .mode = 0644, 458 .proc_handler = &proc_dointvec, 459 }, 460 { 461 .ctl_name = KERN_MSGMNI, 462 .procname = "msgmni", 463 .data = &msg_ctlmni, 464 .maxlen = sizeof (int), 465 .mode = 0644, 466 .proc_handler = &proc_dointvec, 467 }, 468 { 469 .ctl_name = KERN_MSGMNB, 470 .procname = "msgmnb", 471 .data = &msg_ctlmnb, 472 .maxlen = sizeof (int), 473 .mode = 0644, 474 .proc_handler = &proc_dointvec, 475 }, 476 { 477 .ctl_name = KERN_SEM, 478 .procname = "sem", 479 .data = &sem_ctls, 480 .maxlen = 4*sizeof (int), 481 .mode = 0644, 482 .proc_handler = &proc_dointvec, 483 }, 484 #endif 485 #ifdef CONFIG_MAGIC_SYSRQ 486 { 487 .ctl_name = KERN_SYSRQ, 488 .procname = "sysrq", 489 .data = &sysrq_enabled, 490 .maxlen = sizeof (int), 491 .mode = 0644, 492 .proc_handler = &proc_dointvec, 493 }, 494 #endif 495 { 496 .ctl_name = KERN_CADPID, 497 .procname = "cad_pid", 498 .data = &cad_pid, 499 .maxlen = sizeof (int), 500 .mode = 0600, 501 .proc_handler = &proc_dointvec, 502 }, 503 { 504 .ctl_name = KERN_MAX_THREADS, 505 .procname = "threads-max", 506 .data = &max_threads, 507 .maxlen = sizeof(int), 508 .mode = 0644, 509 .proc_handler = &proc_dointvec, 510 }, 511 { 512 .ctl_name = KERN_RANDOM, 513 .procname = "random", 514 .mode = 0555, 515 .child = random_table, 516 }, 517 #ifdef CONFIG_UNIX98_PTYS 518 { 519 .ctl_name = KERN_PTY, 520 .procname = "pty", 521 .mode = 0555, 522 .child = pty_table, 523 }, 524 #endif 525 { 526 .ctl_name = KERN_OVERFLOWUID, 527 .procname = "overflowuid", 528 .data = &overflowuid, 529 .maxlen = sizeof(int), 530 .mode = 0644, 531 .proc_handler = &proc_dointvec_minmax, 532 .strategy = &sysctl_intvec, 533 .extra1 = &minolduid, 534 .extra2 = &maxolduid, 535 }, 536 { 537 .ctl_name = KERN_OVERFLOWGID, 538 .procname = "overflowgid", 539 .data = &overflowgid, 540 .maxlen = sizeof(int), 541 .mode = 0644, 542 .proc_handler = &proc_dointvec_minmax, 543 .strategy = &sysctl_intvec, 544 .extra1 = &minolduid, 545 .extra2 = &maxolduid, 546 }, 547 #ifdef CONFIG_ARCH_S390 548 #ifdef CONFIG_MATHEMU 549 { 550 .ctl_name = KERN_IEEE_EMULATION_WARNINGS, 551 .procname = "ieee_emulation_warnings", 552 .data = &sysctl_ieee_emulation_warnings, 553 .maxlen = sizeof(int), 554 .mode = 0644, 555 .proc_handler = &proc_dointvec, 556 }, 557 #endif 558 #ifdef CONFIG_NO_IDLE_HZ 559 { 560 .ctl_name = KERN_HZ_TIMER, 561 .procname = "hz_timer", 562 .data = &sysctl_hz_timer, 563 .maxlen = sizeof(int), 564 .mode = 0644, 565 .proc_handler = &proc_dointvec, 566 }, 567 #endif 568 { 569 .ctl_name = KERN_S390_USER_DEBUG_LOGGING, 570 .procname = "userprocess_debug", 571 .data = &sysctl_userprocess_debug, 572 .maxlen = sizeof(int), 573 .mode = 0644, 574 .proc_handler = &proc_dointvec, 575 }, 576 #endif 577 { 578 .ctl_name = KERN_PIDMAX, 579 .procname = "pid_max", 580 .data = &pid_max, 581 .maxlen = sizeof (int), 582 .mode = 0644, 583 .proc_handler = &proc_dointvec_minmax, 584 .strategy = sysctl_intvec, 585 .extra1 = &pid_max_min, 586 .extra2 = &pid_max_max, 587 }, 588 { 589 .ctl_name = KERN_PANIC_ON_OOPS, 590 .procname = "panic_on_oops", 591 .data = &panic_on_oops, 592 .maxlen = sizeof(int), 593 .mode = 0644, 594 .proc_handler = &proc_dointvec, 595 }, 596 { 597 .ctl_name = KERN_PRINTK_RATELIMIT, 598 .procname = "printk_ratelimit", 599 .data = &printk_ratelimit_jiffies, 600 .maxlen = sizeof(int), 601 .mode = 0644, 602 .proc_handler = &proc_dointvec_jiffies, 603 .strategy = &sysctl_jiffies, 604 }, 605 { 606 .ctl_name = KERN_PRINTK_RATELIMIT_BURST, 607 .procname = "printk_ratelimit_burst", 608 .data = &printk_ratelimit_burst, 609 .maxlen = sizeof(int), 610 .mode = 0644, 611 .proc_handler = &proc_dointvec, 612 }, 613 { 614 .ctl_name = KERN_NGROUPS_MAX, 615 .procname = "ngroups_max", 616 .data = &ngroups_max, 617 .maxlen = sizeof (int), 618 .mode = 0444, 619 .proc_handler = &proc_dointvec, 620 }, 621 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) 622 { 623 .ctl_name = KERN_UNKNOWN_NMI_PANIC, 624 .procname = "unknown_nmi_panic", 625 .data = &unknown_nmi_panic, 626 .maxlen = sizeof (int), 627 .mode = 0644, 628 .proc_handler = &proc_unknown_nmi_panic, 629 }, 630 #endif 631 #if defined(CONFIG_X86) 632 { 633 .ctl_name = KERN_BOOTLOADER_TYPE, 634 .procname = "bootloader_type", 635 .data = &bootloader_type, 636 .maxlen = sizeof (int), 637 .mode = 0444, 638 .proc_handler = &proc_dointvec, 639 }, 640 #endif 641 { 642 .ctl_name = KERN_RANDOMIZE, 643 .procname = "randomize_va_space", 644 .data = &randomize_va_space, 645 .maxlen = sizeof(int), 646 .mode = 0644, 647 .proc_handler = &proc_dointvec, 648 }, 649 #if defined(CONFIG_ARCH_S390) 650 { 651 .ctl_name = KERN_SPIN_RETRY, 652 .procname = "spin_retry", 653 .data = &spin_retry, 654 .maxlen = sizeof (int), 655 .mode = 0644, 656 .proc_handler = &proc_dointvec, 657 }, 658 #endif 659 { .ctl_name = 0 } 660 }; 661 662 /* Constants for minimum and maximum testing in vm_table. 663 We use these as one-element integer vectors. */ 664 static int zero; 665 static int one_hundred = 100; 666 667 668 static ctl_table vm_table[] = { 669 { 670 .ctl_name = VM_OVERCOMMIT_MEMORY, 671 .procname = "overcommit_memory", 672 .data = &sysctl_overcommit_memory, 673 .maxlen = sizeof(sysctl_overcommit_memory), 674 .mode = 0644, 675 .proc_handler = &proc_dointvec, 676 }, 677 { 678 .ctl_name = VM_OVERCOMMIT_RATIO, 679 .procname = "overcommit_ratio", 680 .data = &sysctl_overcommit_ratio, 681 .maxlen = sizeof(sysctl_overcommit_ratio), 682 .mode = 0644, 683 .proc_handler = &proc_dointvec, 684 }, 685 { 686 .ctl_name = VM_PAGE_CLUSTER, 687 .procname = "page-cluster", 688 .data = &page_cluster, 689 .maxlen = sizeof(int), 690 .mode = 0644, 691 .proc_handler = &proc_dointvec, 692 }, 693 { 694 .ctl_name = VM_DIRTY_BACKGROUND, 695 .procname = "dirty_background_ratio", 696 .data = &dirty_background_ratio, 697 .maxlen = sizeof(dirty_background_ratio), 698 .mode = 0644, 699 .proc_handler = &proc_dointvec_minmax, 700 .strategy = &sysctl_intvec, 701 .extra1 = &zero, 702 .extra2 = &one_hundred, 703 }, 704 { 705 .ctl_name = VM_DIRTY_RATIO, 706 .procname = "dirty_ratio", 707 .data = &vm_dirty_ratio, 708 .maxlen = sizeof(vm_dirty_ratio), 709 .mode = 0644, 710 .proc_handler = &proc_dointvec_minmax, 711 .strategy = &sysctl_intvec, 712 .extra1 = &zero, 713 .extra2 = &one_hundred, 714 }, 715 { 716 .ctl_name = VM_DIRTY_WB_CS, 717 .procname = "dirty_writeback_centisecs", 718 .data = &dirty_writeback_centisecs, 719 .maxlen = sizeof(dirty_writeback_centisecs), 720 .mode = 0644, 721 .proc_handler = &dirty_writeback_centisecs_handler, 722 }, 723 { 724 .ctl_name = VM_DIRTY_EXPIRE_CS, 725 .procname = "dirty_expire_centisecs", 726 .data = &dirty_expire_centisecs, 727 .maxlen = sizeof(dirty_expire_centisecs), 728 .mode = 0644, 729 .proc_handler = &proc_dointvec, 730 }, 731 { 732 .ctl_name = VM_NR_PDFLUSH_THREADS, 733 .procname = "nr_pdflush_threads", 734 .data = &nr_pdflush_threads, 735 .maxlen = sizeof nr_pdflush_threads, 736 .mode = 0444 /* read-only*/, 737 .proc_handler = &proc_dointvec, 738 }, 739 { 740 .ctl_name = VM_SWAPPINESS, 741 .procname = "swappiness", 742 .data = &vm_swappiness, 743 .maxlen = sizeof(vm_swappiness), 744 .mode = 0644, 745 .proc_handler = &proc_dointvec_minmax, 746 .strategy = &sysctl_intvec, 747 .extra1 = &zero, 748 .extra2 = &one_hundred, 749 }, 750 #ifdef CONFIG_HUGETLB_PAGE 751 { 752 .ctl_name = VM_HUGETLB_PAGES, 753 .procname = "nr_hugepages", 754 .data = &max_huge_pages, 755 .maxlen = sizeof(unsigned long), 756 .mode = 0644, 757 .proc_handler = &hugetlb_sysctl_handler, 758 .extra1 = (void *)&hugetlb_zero, 759 .extra2 = (void *)&hugetlb_infinity, 760 }, 761 { 762 .ctl_name = VM_HUGETLB_GROUP, 763 .procname = "hugetlb_shm_group", 764 .data = &sysctl_hugetlb_shm_group, 765 .maxlen = sizeof(gid_t), 766 .mode = 0644, 767 .proc_handler = &proc_dointvec, 768 }, 769 #endif 770 { 771 .ctl_name = VM_LOWMEM_RESERVE_RATIO, 772 .procname = "lowmem_reserve_ratio", 773 .data = &sysctl_lowmem_reserve_ratio, 774 .maxlen = sizeof(sysctl_lowmem_reserve_ratio), 775 .mode = 0644, 776 .proc_handler = &lowmem_reserve_ratio_sysctl_handler, 777 .strategy = &sysctl_intvec, 778 }, 779 { 780 .ctl_name = VM_MIN_FREE_KBYTES, 781 .procname = "min_free_kbytes", 782 .data = &min_free_kbytes, 783 .maxlen = sizeof(min_free_kbytes), 784 .mode = 0644, 785 .proc_handler = &min_free_kbytes_sysctl_handler, 786 .strategy = &sysctl_intvec, 787 .extra1 = &zero, 788 }, 789 #ifdef CONFIG_MMU 790 { 791 .ctl_name = VM_MAX_MAP_COUNT, 792 .procname = "max_map_count", 793 .data = &sysctl_max_map_count, 794 .maxlen = sizeof(sysctl_max_map_count), 795 .mode = 0644, 796 .proc_handler = &proc_dointvec 797 }, 798 #endif 799 { 800 .ctl_name = VM_LAPTOP_MODE, 801 .procname = "laptop_mode", 802 .data = &laptop_mode, 803 .maxlen = sizeof(laptop_mode), 804 .mode = 0644, 805 .proc_handler = &proc_dointvec, 806 .strategy = &sysctl_intvec, 807 .extra1 = &zero, 808 }, 809 { 810 .ctl_name = VM_BLOCK_DUMP, 811 .procname = "block_dump", 812 .data = &block_dump, 813 .maxlen = sizeof(block_dump), 814 .mode = 0644, 815 .proc_handler = &proc_dointvec, 816 .strategy = &sysctl_intvec, 817 .extra1 = &zero, 818 }, 819 { 820 .ctl_name = VM_VFS_CACHE_PRESSURE, 821 .procname = "vfs_cache_pressure", 822 .data = &sysctl_vfs_cache_pressure, 823 .maxlen = sizeof(sysctl_vfs_cache_pressure), 824 .mode = 0644, 825 .proc_handler = &proc_dointvec, 826 .strategy = &sysctl_intvec, 827 .extra1 = &zero, 828 }, 829 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT 830 { 831 .ctl_name = VM_LEGACY_VA_LAYOUT, 832 .procname = "legacy_va_layout", 833 .data = &sysctl_legacy_va_layout, 834 .maxlen = sizeof(sysctl_legacy_va_layout), 835 .mode = 0644, 836 .proc_handler = &proc_dointvec, 837 .strategy = &sysctl_intvec, 838 .extra1 = &zero, 839 }, 840 #endif 841 #ifdef CONFIG_SWAP 842 { 843 .ctl_name = VM_SWAP_TOKEN_TIMEOUT, 844 .procname = "swap_token_timeout", 845 .data = &swap_token_default_timeout, 846 .maxlen = sizeof(swap_token_default_timeout), 847 .mode = 0644, 848 .proc_handler = &proc_dointvec_jiffies, 849 .strategy = &sysctl_jiffies, 850 }, 851 #endif 852 { .ctl_name = 0 } 853 }; 854 855 static ctl_table proc_table[] = { 856 { .ctl_name = 0 } 857 }; 858 859 static ctl_table fs_table[] = { 860 { 861 .ctl_name = FS_NRINODE, 862 .procname = "inode-nr", 863 .data = &inodes_stat, 864 .maxlen = 2*sizeof(int), 865 .mode = 0444, 866 .proc_handler = &proc_dointvec, 867 }, 868 { 869 .ctl_name = FS_STATINODE, 870 .procname = "inode-state", 871 .data = &inodes_stat, 872 .maxlen = 7*sizeof(int), 873 .mode = 0444, 874 .proc_handler = &proc_dointvec, 875 }, 876 { 877 .ctl_name = FS_NRFILE, 878 .procname = "file-nr", 879 .data = &files_stat, 880 .maxlen = 3*sizeof(int), 881 .mode = 0444, 882 .proc_handler = &proc_dointvec, 883 }, 884 { 885 .ctl_name = FS_MAXFILE, 886 .procname = "file-max", 887 .data = &files_stat.max_files, 888 .maxlen = sizeof(int), 889 .mode = 0644, 890 .proc_handler = &proc_dointvec, 891 }, 892 { 893 .ctl_name = FS_DENTRY, 894 .procname = "dentry-state", 895 .data = &dentry_stat, 896 .maxlen = 6*sizeof(int), 897 .mode = 0444, 898 .proc_handler = &proc_dointvec, 899 }, 900 { 901 .ctl_name = FS_OVERFLOWUID, 902 .procname = "overflowuid", 903 .data = &fs_overflowuid, 904 .maxlen = sizeof(int), 905 .mode = 0644, 906 .proc_handler = &proc_dointvec_minmax, 907 .strategy = &sysctl_intvec, 908 .extra1 = &minolduid, 909 .extra2 = &maxolduid, 910 }, 911 { 912 .ctl_name = FS_OVERFLOWGID, 913 .procname = "overflowgid", 914 .data = &fs_overflowgid, 915 .maxlen = sizeof(int), 916 .mode = 0644, 917 .proc_handler = &proc_dointvec_minmax, 918 .strategy = &sysctl_intvec, 919 .extra1 = &minolduid, 920 .extra2 = &maxolduid, 921 }, 922 { 923 .ctl_name = FS_LEASES, 924 .procname = "leases-enable", 925 .data = &leases_enable, 926 .maxlen = sizeof(int), 927 .mode = 0644, 928 .proc_handler = &proc_dointvec, 929 }, 930 #ifdef CONFIG_DNOTIFY 931 { 932 .ctl_name = FS_DIR_NOTIFY, 933 .procname = "dir-notify-enable", 934 .data = &dir_notify_enable, 935 .maxlen = sizeof(int), 936 .mode = 0644, 937 .proc_handler = &proc_dointvec, 938 }, 939 #endif 940 #ifdef CONFIG_MMU 941 { 942 .ctl_name = FS_LEASE_TIME, 943 .procname = "lease-break-time", 944 .data = &lease_break_time, 945 .maxlen = sizeof(int), 946 .mode = 0644, 947 .proc_handler = &proc_dointvec, 948 }, 949 { 950 .ctl_name = FS_AIO_NR, 951 .procname = "aio-nr", 952 .data = &aio_nr, 953 .maxlen = sizeof(aio_nr), 954 .mode = 0444, 955 .proc_handler = &proc_dointvec, 956 }, 957 { 958 .ctl_name = FS_AIO_MAX_NR, 959 .procname = "aio-max-nr", 960 .data = &aio_max_nr, 961 .maxlen = sizeof(aio_max_nr), 962 .mode = 0644, 963 .proc_handler = &proc_dointvec, 964 }, 965 #ifdef CONFIG_INOTIFY 966 { 967 .ctl_name = FS_INOTIFY, 968 .procname = "inotify", 969 .mode = 0555, 970 .child = inotify_table, 971 }, 972 #endif 973 #endif 974 { 975 .ctl_name = KERN_SETUID_DUMPABLE, 976 .procname = "suid_dumpable", 977 .data = &suid_dumpable, 978 .maxlen = sizeof(int), 979 .mode = 0644, 980 .proc_handler = &proc_dointvec, 981 }, 982 { .ctl_name = 0 } 983 }; 984 985 static ctl_table debug_table[] = { 986 { .ctl_name = 0 } 987 }; 988 989 static ctl_table dev_table[] = { 990 { .ctl_name = 0 } 991 }; 992 993 extern void init_irq_proc (void); 994 995 void __init sysctl_init(void) 996 { 997 #ifdef CONFIG_PROC_FS 998 register_proc_table(root_table, proc_sys_root); 999 init_irq_proc(); 1000 #endif 1001 } 1002 1003 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, 1004 void __user *newval, size_t newlen) 1005 { 1006 struct list_head *tmp; 1007 1008 if (nlen <= 0 || nlen >= CTL_MAXNAME) 1009 return -ENOTDIR; 1010 if (oldval) { 1011 int old_len; 1012 if (!oldlenp || get_user(old_len, oldlenp)) 1013 return -EFAULT; 1014 } 1015 tmp = &root_table_header.ctl_entry; 1016 do { 1017 struct ctl_table_header *head = 1018 list_entry(tmp, struct ctl_table_header, ctl_entry); 1019 void *context = NULL; 1020 int error = parse_table(name, nlen, oldval, oldlenp, 1021 newval, newlen, head->ctl_table, 1022 &context); 1023 kfree(context); 1024 if (error != -ENOTDIR) 1025 return error; 1026 tmp = tmp->next; 1027 } while (tmp != &root_table_header.ctl_entry); 1028 return -ENOTDIR; 1029 } 1030 1031 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 1032 { 1033 struct __sysctl_args tmp; 1034 int error; 1035 1036 if (copy_from_user(&tmp, args, sizeof(tmp))) 1037 return -EFAULT; 1038 1039 lock_kernel(); 1040 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, 1041 tmp.newval, tmp.newlen); 1042 unlock_kernel(); 1043 return error; 1044 } 1045 1046 /* 1047 * ctl_perm does NOT grant the superuser all rights automatically, because 1048 * some sysctl variables are readonly even to root. 1049 */ 1050 1051 static int test_perm(int mode, int op) 1052 { 1053 if (!current->euid) 1054 mode >>= 6; 1055 else if (in_egroup_p(0)) 1056 mode >>= 3; 1057 if ((mode & op & 0007) == op) 1058 return 0; 1059 return -EACCES; 1060 } 1061 1062 static inline int ctl_perm(ctl_table *table, int op) 1063 { 1064 int error; 1065 error = security_sysctl(table, op); 1066 if (error) 1067 return error; 1068 return test_perm(table->mode, op); 1069 } 1070 1071 static int parse_table(int __user *name, int nlen, 1072 void __user *oldval, size_t __user *oldlenp, 1073 void __user *newval, size_t newlen, 1074 ctl_table *table, void **context) 1075 { 1076 int n; 1077 repeat: 1078 if (!nlen) 1079 return -ENOTDIR; 1080 if (get_user(n, name)) 1081 return -EFAULT; 1082 for ( ; table->ctl_name; table++) { 1083 if (n == table->ctl_name || table->ctl_name == CTL_ANY) { 1084 int error; 1085 if (table->child) { 1086 if (ctl_perm(table, 001)) 1087 return -EPERM; 1088 if (table->strategy) { 1089 error = table->strategy( 1090 table, name, nlen, 1091 oldval, oldlenp, 1092 newval, newlen, context); 1093 if (error) 1094 return error; 1095 } 1096 name++; 1097 nlen--; 1098 table = table->child; 1099 goto repeat; 1100 } 1101 error = do_sysctl_strategy(table, name, nlen, 1102 oldval, oldlenp, 1103 newval, newlen, context); 1104 return error; 1105 } 1106 } 1107 return -ENOTDIR; 1108 } 1109 1110 /* Perform the actual read/write of a sysctl table entry. */ 1111 int do_sysctl_strategy (ctl_table *table, 1112 int __user *name, int nlen, 1113 void __user *oldval, size_t __user *oldlenp, 1114 void __user *newval, size_t newlen, void **context) 1115 { 1116 int op = 0, rc; 1117 size_t len; 1118 1119 if (oldval) 1120 op |= 004; 1121 if (newval) 1122 op |= 002; 1123 if (ctl_perm(table, op)) 1124 return -EPERM; 1125 1126 if (table->strategy) { 1127 rc = table->strategy(table, name, nlen, oldval, oldlenp, 1128 newval, newlen, context); 1129 if (rc < 0) 1130 return rc; 1131 if (rc > 0) 1132 return 0; 1133 } 1134 1135 /* If there is no strategy routine, or if the strategy returns 1136 * zero, proceed with automatic r/w */ 1137 if (table->data && table->maxlen) { 1138 if (oldval && oldlenp) { 1139 if (get_user(len, oldlenp)) 1140 return -EFAULT; 1141 if (len) { 1142 if (len > table->maxlen) 1143 len = table->maxlen; 1144 if(copy_to_user(oldval, table->data, len)) 1145 return -EFAULT; 1146 if(put_user(len, oldlenp)) 1147 return -EFAULT; 1148 } 1149 } 1150 if (newval && newlen) { 1151 len = newlen; 1152 if (len > table->maxlen) 1153 len = table->maxlen; 1154 if(copy_from_user(table->data, newval, len)) 1155 return -EFAULT; 1156 } 1157 } 1158 return 0; 1159 } 1160 1161 /** 1162 * register_sysctl_table - register a sysctl hierarchy 1163 * @table: the top-level table structure 1164 * @insert_at_head: whether the entry should be inserted in front or at the end 1165 * 1166 * Register a sysctl table hierarchy. @table should be a filled in ctl_table 1167 * array. An entry with a ctl_name of 0 terminates the table. 1168 * 1169 * The members of the &ctl_table structure are used as follows: 1170 * 1171 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number 1172 * must be unique within that level of sysctl 1173 * 1174 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not 1175 * enter a sysctl file 1176 * 1177 * data - a pointer to data for use by proc_handler 1178 * 1179 * maxlen - the maximum size in bytes of the data 1180 * 1181 * mode - the file permissions for the /proc/sys file, and for sysctl(2) 1182 * 1183 * child - a pointer to the child sysctl table if this entry is a directory, or 1184 * %NULL. 1185 * 1186 * proc_handler - the text handler routine (described below) 1187 * 1188 * strategy - the strategy routine (described below) 1189 * 1190 * de - for internal use by the sysctl routines 1191 * 1192 * extra1, extra2 - extra pointers usable by the proc handler routines 1193 * 1194 * Leaf nodes in the sysctl tree will be represented by a single file 1195 * under /proc; non-leaf nodes will be represented by directories. 1196 * 1197 * sysctl(2) can automatically manage read and write requests through 1198 * the sysctl table. The data and maxlen fields of the ctl_table 1199 * struct enable minimal validation of the values being written to be 1200 * performed, and the mode field allows minimal authentication. 1201 * 1202 * More sophisticated management can be enabled by the provision of a 1203 * strategy routine with the table entry. This will be called before 1204 * any automatic read or write of the data is performed. 1205 * 1206 * The strategy routine may return 1207 * 1208 * < 0 - Error occurred (error is passed to user process) 1209 * 1210 * 0 - OK - proceed with automatic read or write. 1211 * 1212 * > 0 - OK - read or write has been done by the strategy routine, so 1213 * return immediately. 1214 * 1215 * There must be a proc_handler routine for any terminal nodes 1216 * mirrored under /proc/sys (non-terminals are handled by a built-in 1217 * directory handler). Several default handlers are available to 1218 * cover common cases - 1219 * 1220 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), 1221 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 1222 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax() 1223 * 1224 * It is the handler's job to read the input buffer from user memory 1225 * and process it. The handler should return 0 on success. 1226 * 1227 * This routine returns %NULL on a failure to register, and a pointer 1228 * to the table header on success. 1229 */ 1230 struct ctl_table_header *register_sysctl_table(ctl_table * table, 1231 int insert_at_head) 1232 { 1233 struct ctl_table_header *tmp; 1234 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); 1235 if (!tmp) 1236 return NULL; 1237 tmp->ctl_table = table; 1238 INIT_LIST_HEAD(&tmp->ctl_entry); 1239 if (insert_at_head) 1240 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); 1241 else 1242 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); 1243 #ifdef CONFIG_PROC_FS 1244 register_proc_table(table, proc_sys_root); 1245 #endif 1246 return tmp; 1247 } 1248 1249 /** 1250 * unregister_sysctl_table - unregister a sysctl table hierarchy 1251 * @header: the header returned from register_sysctl_table 1252 * 1253 * Unregisters the sysctl table and all children. proc entries may not 1254 * actually be removed until they are no longer used by anyone. 1255 */ 1256 void unregister_sysctl_table(struct ctl_table_header * header) 1257 { 1258 list_del(&header->ctl_entry); 1259 #ifdef CONFIG_PROC_FS 1260 unregister_proc_table(header->ctl_table, proc_sys_root); 1261 #endif 1262 kfree(header); 1263 } 1264 1265 /* 1266 * /proc/sys support 1267 */ 1268 1269 #ifdef CONFIG_PROC_FS 1270 1271 /* Scan the sysctl entries in table and add them all into /proc */ 1272 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root) 1273 { 1274 struct proc_dir_entry *de; 1275 int len; 1276 mode_t mode; 1277 1278 for (; table->ctl_name; table++) { 1279 /* Can't do anything without a proc name. */ 1280 if (!table->procname) 1281 continue; 1282 /* Maybe we can't do anything with it... */ 1283 if (!table->proc_handler && !table->child) { 1284 printk(KERN_WARNING "SYSCTL: Can't register %s\n", 1285 table->procname); 1286 continue; 1287 } 1288 1289 len = strlen(table->procname); 1290 mode = table->mode; 1291 1292 de = NULL; 1293 if (table->proc_handler) 1294 mode |= S_IFREG; 1295 else { 1296 mode |= S_IFDIR; 1297 for (de = root->subdir; de; de = de->next) { 1298 if (proc_match(len, table->procname, de)) 1299 break; 1300 } 1301 /* If the subdir exists already, de is non-NULL */ 1302 } 1303 1304 if (!de) { 1305 de = create_proc_entry(table->procname, mode, root); 1306 if (!de) 1307 continue; 1308 de->data = (void *) table; 1309 if (table->proc_handler) 1310 de->proc_fops = &proc_sys_file_operations; 1311 } 1312 table->de = de; 1313 if (de->mode & S_IFDIR) 1314 register_proc_table(table->child, de); 1315 } 1316 } 1317 1318 /* 1319 * Unregister a /proc sysctl table and any subdirectories. 1320 */ 1321 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) 1322 { 1323 struct proc_dir_entry *de; 1324 for (; table->ctl_name; table++) { 1325 if (!(de = table->de)) 1326 continue; 1327 if (de->mode & S_IFDIR) { 1328 if (!table->child) { 1329 printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); 1330 continue; 1331 } 1332 unregister_proc_table(table->child, de); 1333 1334 /* Don't unregister directories which still have entries.. */ 1335 if (de->subdir) 1336 continue; 1337 } 1338 1339 /* Don't unregister proc entries that are still being used.. */ 1340 if (atomic_read(&de->count)) 1341 continue; 1342 1343 table->de = NULL; 1344 remove_proc_entry(table->procname, root); 1345 } 1346 } 1347 1348 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf, 1349 size_t count, loff_t *ppos) 1350 { 1351 int op; 1352 struct proc_dir_entry *de; 1353 struct ctl_table *table; 1354 size_t res; 1355 ssize_t error; 1356 1357 de = PDE(file->f_dentry->d_inode); 1358 if (!de || !de->data) 1359 return -ENOTDIR; 1360 table = (struct ctl_table *) de->data; 1361 if (!table || !table->proc_handler) 1362 return -ENOTDIR; 1363 op = (write ? 002 : 004); 1364 if (ctl_perm(table, op)) 1365 return -EPERM; 1366 1367 res = count; 1368 1369 error = (*table->proc_handler) (table, write, file, buf, &res, ppos); 1370 if (error) 1371 return error; 1372 return res; 1373 } 1374 1375 static int proc_opensys(struct inode *inode, struct file *file) 1376 { 1377 if (file->f_mode & FMODE_WRITE) { 1378 /* 1379 * sysctl entries that are not writable, 1380 * are _NOT_ writable, capabilities or not. 1381 */ 1382 if (!(inode->i_mode & S_IWUSR)) 1383 return -EPERM; 1384 } 1385 1386 return 0; 1387 } 1388 1389 static ssize_t proc_readsys(struct file * file, char __user * buf, 1390 size_t count, loff_t *ppos) 1391 { 1392 return do_rw_proc(0, file, buf, count, ppos); 1393 } 1394 1395 static ssize_t proc_writesys(struct file * file, const char __user * buf, 1396 size_t count, loff_t *ppos) 1397 { 1398 return do_rw_proc(1, file, (char __user *) buf, count, ppos); 1399 } 1400 1401 /** 1402 * proc_dostring - read a string sysctl 1403 * @table: the sysctl table 1404 * @write: %TRUE if this is a write to the sysctl file 1405 * @filp: the file structure 1406 * @buffer: the user buffer 1407 * @lenp: the size of the user buffer 1408 * @ppos: file position 1409 * 1410 * Reads/writes a string from/to the user buffer. If the kernel 1411 * buffer provided is not large enough to hold the string, the 1412 * string is truncated. The copied string is %NULL-terminated. 1413 * If the string is being read by the user process, it is copied 1414 * and a newline '\n' is added. It is truncated if the buffer is 1415 * not large enough. 1416 * 1417 * Returns 0 on success. 1418 */ 1419 int proc_dostring(ctl_table *table, int write, struct file *filp, 1420 void __user *buffer, size_t *lenp, loff_t *ppos) 1421 { 1422 size_t len; 1423 char __user *p; 1424 char c; 1425 1426 if (!table->data || !table->maxlen || !*lenp || 1427 (*ppos && !write)) { 1428 *lenp = 0; 1429 return 0; 1430 } 1431 1432 if (write) { 1433 len = 0; 1434 p = buffer; 1435 while (len < *lenp) { 1436 if (get_user(c, p++)) 1437 return -EFAULT; 1438 if (c == 0 || c == '\n') 1439 break; 1440 len++; 1441 } 1442 if (len >= table->maxlen) 1443 len = table->maxlen-1; 1444 if(copy_from_user(table->data, buffer, len)) 1445 return -EFAULT; 1446 ((char *) table->data)[len] = 0; 1447 *ppos += *lenp; 1448 } else { 1449 len = strlen(table->data); 1450 if (len > table->maxlen) 1451 len = table->maxlen; 1452 if (len > *lenp) 1453 len = *lenp; 1454 if (len) 1455 if(copy_to_user(buffer, table->data, len)) 1456 return -EFAULT; 1457 if (len < *lenp) { 1458 if(put_user('\n', ((char __user *) buffer) + len)) 1459 return -EFAULT; 1460 len++; 1461 } 1462 *lenp = len; 1463 *ppos += len; 1464 } 1465 return 0; 1466 } 1467 1468 /* 1469 * Special case of dostring for the UTS structure. This has locks 1470 * to observe. Should this be in kernel/sys.c ???? 1471 */ 1472 1473 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 1474 void __user *buffer, size_t *lenp, loff_t *ppos) 1475 { 1476 int r; 1477 1478 if (!write) { 1479 down_read(&uts_sem); 1480 r=proc_dostring(table,0,filp,buffer,lenp, ppos); 1481 up_read(&uts_sem); 1482 } else { 1483 down_write(&uts_sem); 1484 r=proc_dostring(table,1,filp,buffer,lenp, ppos); 1485 up_write(&uts_sem); 1486 } 1487 return r; 1488 } 1489 1490 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp, 1491 int *valp, 1492 int write, void *data) 1493 { 1494 if (write) { 1495 *valp = *negp ? -*lvalp : *lvalp; 1496 } else { 1497 int val = *valp; 1498 if (val < 0) { 1499 *negp = -1; 1500 *lvalp = (unsigned long)-val; 1501 } else { 1502 *negp = 0; 1503 *lvalp = (unsigned long)val; 1504 } 1505 } 1506 return 0; 1507 } 1508 1509 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, 1510 void __user *buffer, size_t *lenp, loff_t *ppos, 1511 int (*conv)(int *negp, unsigned long *lvalp, int *valp, 1512 int write, void *data), 1513 void *data) 1514 { 1515 #define TMPBUFLEN 21 1516 int *i, vleft, first=1, neg, val; 1517 unsigned long lval; 1518 size_t left, len; 1519 1520 char buf[TMPBUFLEN], *p; 1521 char __user *s = buffer; 1522 1523 if (!table->data || !table->maxlen || !*lenp || 1524 (*ppos && !write)) { 1525 *lenp = 0; 1526 return 0; 1527 } 1528 1529 i = (int *) table->data; 1530 vleft = table->maxlen / sizeof(*i); 1531 left = *lenp; 1532 1533 if (!conv) 1534 conv = do_proc_dointvec_conv; 1535 1536 for (; left && vleft--; i++, first=0) { 1537 if (write) { 1538 while (left) { 1539 char c; 1540 if (get_user(c, s)) 1541 return -EFAULT; 1542 if (!isspace(c)) 1543 break; 1544 left--; 1545 s++; 1546 } 1547 if (!left) 1548 break; 1549 neg = 0; 1550 len = left; 1551 if (len > sizeof(buf) - 1) 1552 len = sizeof(buf) - 1; 1553 if (copy_from_user(buf, s, len)) 1554 return -EFAULT; 1555 buf[len] = 0; 1556 p = buf; 1557 if (*p == '-' && left > 1) { 1558 neg = 1; 1559 left--, p++; 1560 } 1561 if (*p < '0' || *p > '9') 1562 break; 1563 1564 lval = simple_strtoul(p, &p, 0); 1565 1566 len = p-buf; 1567 if ((len < left) && *p && !isspace(*p)) 1568 break; 1569 if (neg) 1570 val = -val; 1571 s += len; 1572 left -= len; 1573 1574 if (conv(&neg, &lval, i, 1, data)) 1575 break; 1576 } else { 1577 p = buf; 1578 if (!first) 1579 *p++ = '\t'; 1580 1581 if (conv(&neg, &lval, i, 0, data)) 1582 break; 1583 1584 sprintf(p, "%s%lu", neg ? "-" : "", lval); 1585 len = strlen(buf); 1586 if (len > left) 1587 len = left; 1588 if(copy_to_user(s, buf, len)) 1589 return -EFAULT; 1590 left -= len; 1591 s += len; 1592 } 1593 } 1594 1595 if (!write && !first && left) { 1596 if(put_user('\n', s)) 1597 return -EFAULT; 1598 left--, s++; 1599 } 1600 if (write) { 1601 while (left) { 1602 char c; 1603 if (get_user(c, s++)) 1604 return -EFAULT; 1605 if (!isspace(c)) 1606 break; 1607 left--; 1608 } 1609 } 1610 if (write && first) 1611 return -EINVAL; 1612 *lenp -= left; 1613 *ppos += *lenp; 1614 return 0; 1615 #undef TMPBUFLEN 1616 } 1617 1618 /** 1619 * proc_dointvec - read a vector of integers 1620 * @table: the sysctl table 1621 * @write: %TRUE if this is a write to the sysctl file 1622 * @filp: the file structure 1623 * @buffer: the user buffer 1624 * @lenp: the size of the user buffer 1625 * @ppos: file position 1626 * 1627 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1628 * values from/to the user buffer, treated as an ASCII string. 1629 * 1630 * Returns 0 on success. 1631 */ 1632 int proc_dointvec(ctl_table *table, int write, struct file *filp, 1633 void __user *buffer, size_t *lenp, loff_t *ppos) 1634 { 1635 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1636 NULL,NULL); 1637 } 1638 1639 #define OP_SET 0 1640 #define OP_AND 1 1641 #define OP_OR 2 1642 #define OP_MAX 3 1643 #define OP_MIN 4 1644 1645 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp, 1646 int *valp, 1647 int write, void *data) 1648 { 1649 int op = *(int *)data; 1650 if (write) { 1651 int val = *negp ? -*lvalp : *lvalp; 1652 switch(op) { 1653 case OP_SET: *valp = val; break; 1654 case OP_AND: *valp &= val; break; 1655 case OP_OR: *valp |= val; break; 1656 case OP_MAX: if(*valp < val) 1657 *valp = val; 1658 break; 1659 case OP_MIN: if(*valp > val) 1660 *valp = val; 1661 break; 1662 } 1663 } else { 1664 int val = *valp; 1665 if (val < 0) { 1666 *negp = -1; 1667 *lvalp = (unsigned long)-val; 1668 } else { 1669 *negp = 0; 1670 *lvalp = (unsigned long)val; 1671 } 1672 } 1673 return 0; 1674 } 1675 1676 /* 1677 * init may raise the set. 1678 */ 1679 1680 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 1681 void __user *buffer, size_t *lenp, loff_t *ppos) 1682 { 1683 int op; 1684 1685 if (!capable(CAP_SYS_MODULE)) { 1686 return -EPERM; 1687 } 1688 1689 op = (current->pid == 1) ? OP_SET : OP_AND; 1690 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1691 do_proc_dointvec_bset_conv,&op); 1692 } 1693 1694 struct do_proc_dointvec_minmax_conv_param { 1695 int *min; 1696 int *max; 1697 }; 1698 1699 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 1700 int *valp, 1701 int write, void *data) 1702 { 1703 struct do_proc_dointvec_minmax_conv_param *param = data; 1704 if (write) { 1705 int val = *negp ? -*lvalp : *lvalp; 1706 if ((param->min && *param->min > val) || 1707 (param->max && *param->max < val)) 1708 return -EINVAL; 1709 *valp = val; 1710 } else { 1711 int val = *valp; 1712 if (val < 0) { 1713 *negp = -1; 1714 *lvalp = (unsigned long)-val; 1715 } else { 1716 *negp = 0; 1717 *lvalp = (unsigned long)val; 1718 } 1719 } 1720 return 0; 1721 } 1722 1723 /** 1724 * proc_dointvec_minmax - read a vector of integers with min/max values 1725 * @table: the sysctl table 1726 * @write: %TRUE if this is a write to the sysctl file 1727 * @filp: the file structure 1728 * @buffer: the user buffer 1729 * @lenp: the size of the user buffer 1730 * @ppos: file position 1731 * 1732 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1733 * values from/to the user buffer, treated as an ASCII string. 1734 * 1735 * This routine will ensure the values are within the range specified by 1736 * table->extra1 (min) and table->extra2 (max). 1737 * 1738 * Returns 0 on success. 1739 */ 1740 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 1741 void __user *buffer, size_t *lenp, loff_t *ppos) 1742 { 1743 struct do_proc_dointvec_minmax_conv_param param = { 1744 .min = (int *) table->extra1, 1745 .max = (int *) table->extra2, 1746 }; 1747 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 1748 do_proc_dointvec_minmax_conv, ¶m); 1749 } 1750 1751 static int do_proc_doulongvec_minmax(ctl_table *table, int write, 1752 struct file *filp, 1753 void __user *buffer, 1754 size_t *lenp, loff_t *ppos, 1755 unsigned long convmul, 1756 unsigned long convdiv) 1757 { 1758 #define TMPBUFLEN 21 1759 unsigned long *i, *min, *max, val; 1760 int vleft, first=1, neg; 1761 size_t len, left; 1762 char buf[TMPBUFLEN], *p; 1763 char __user *s = buffer; 1764 1765 if (!table->data || !table->maxlen || !*lenp || 1766 (*ppos && !write)) { 1767 *lenp = 0; 1768 return 0; 1769 } 1770 1771 i = (unsigned long *) table->data; 1772 min = (unsigned long *) table->extra1; 1773 max = (unsigned long *) table->extra2; 1774 vleft = table->maxlen / sizeof(unsigned long); 1775 left = *lenp; 1776 1777 for (; left && vleft--; i++, min++, max++, first=0) { 1778 if (write) { 1779 while (left) { 1780 char c; 1781 if (get_user(c, s)) 1782 return -EFAULT; 1783 if (!isspace(c)) 1784 break; 1785 left--; 1786 s++; 1787 } 1788 if (!left) 1789 break; 1790 neg = 0; 1791 len = left; 1792 if (len > TMPBUFLEN-1) 1793 len = TMPBUFLEN-1; 1794 if (copy_from_user(buf, s, len)) 1795 return -EFAULT; 1796 buf[len] = 0; 1797 p = buf; 1798 if (*p == '-' && left > 1) { 1799 neg = 1; 1800 left--, p++; 1801 } 1802 if (*p < '0' || *p > '9') 1803 break; 1804 val = simple_strtoul(p, &p, 0) * convmul / convdiv ; 1805 len = p-buf; 1806 if ((len < left) && *p && !isspace(*p)) 1807 break; 1808 if (neg) 1809 val = -val; 1810 s += len; 1811 left -= len; 1812 1813 if(neg) 1814 continue; 1815 if ((min && val < *min) || (max && val > *max)) 1816 continue; 1817 *i = val; 1818 } else { 1819 p = buf; 1820 if (!first) 1821 *p++ = '\t'; 1822 sprintf(p, "%lu", convdiv * (*i) / convmul); 1823 len = strlen(buf); 1824 if (len > left) 1825 len = left; 1826 if(copy_to_user(s, buf, len)) 1827 return -EFAULT; 1828 left -= len; 1829 s += len; 1830 } 1831 } 1832 1833 if (!write && !first && left) { 1834 if(put_user('\n', s)) 1835 return -EFAULT; 1836 left--, s++; 1837 } 1838 if (write) { 1839 while (left) { 1840 char c; 1841 if (get_user(c, s++)) 1842 return -EFAULT; 1843 if (!isspace(c)) 1844 break; 1845 left--; 1846 } 1847 } 1848 if (write && first) 1849 return -EINVAL; 1850 *lenp -= left; 1851 *ppos += *lenp; 1852 return 0; 1853 #undef TMPBUFLEN 1854 } 1855 1856 /** 1857 * proc_doulongvec_minmax - read a vector of long integers with min/max values 1858 * @table: the sysctl table 1859 * @write: %TRUE if this is a write to the sysctl file 1860 * @filp: the file structure 1861 * @buffer: the user buffer 1862 * @lenp: the size of the user buffer 1863 * @ppos: file position 1864 * 1865 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 1866 * values from/to the user buffer, treated as an ASCII string. 1867 * 1868 * This routine will ensure the values are within the range specified by 1869 * table->extra1 (min) and table->extra2 (max). 1870 * 1871 * Returns 0 on success. 1872 */ 1873 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 1874 void __user *buffer, size_t *lenp, loff_t *ppos) 1875 { 1876 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l); 1877 } 1878 1879 /** 1880 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values 1881 * @table: the sysctl table 1882 * @write: %TRUE if this is a write to the sysctl file 1883 * @filp: the file structure 1884 * @buffer: the user buffer 1885 * @lenp: the size of the user buffer 1886 * @ppos: file position 1887 * 1888 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long 1889 * values from/to the user buffer, treated as an ASCII string. The values 1890 * are treated as milliseconds, and converted to jiffies when they are stored. 1891 * 1892 * This routine will ensure the values are within the range specified by 1893 * table->extra1 (min) and table->extra2 (max). 1894 * 1895 * Returns 0 on success. 1896 */ 1897 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 1898 struct file *filp, 1899 void __user *buffer, 1900 size_t *lenp, loff_t *ppos) 1901 { 1902 return do_proc_doulongvec_minmax(table, write, filp, buffer, 1903 lenp, ppos, HZ, 1000l); 1904 } 1905 1906 1907 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp, 1908 int *valp, 1909 int write, void *data) 1910 { 1911 if (write) { 1912 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ); 1913 } else { 1914 int val = *valp; 1915 unsigned long lval; 1916 if (val < 0) { 1917 *negp = -1; 1918 lval = (unsigned long)-val; 1919 } else { 1920 *negp = 0; 1921 lval = (unsigned long)val; 1922 } 1923 *lvalp = lval / HZ; 1924 } 1925 return 0; 1926 } 1927 1928 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp, 1929 int *valp, 1930 int write, void *data) 1931 { 1932 if (write) { 1933 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp); 1934 } else { 1935 int val = *valp; 1936 unsigned long lval; 1937 if (val < 0) { 1938 *negp = -1; 1939 lval = (unsigned long)-val; 1940 } else { 1941 *negp = 0; 1942 lval = (unsigned long)val; 1943 } 1944 *lvalp = jiffies_to_clock_t(lval); 1945 } 1946 return 0; 1947 } 1948 1949 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp, 1950 int *valp, 1951 int write, void *data) 1952 { 1953 if (write) { 1954 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp); 1955 } else { 1956 int val = *valp; 1957 unsigned long lval; 1958 if (val < 0) { 1959 *negp = -1; 1960 lval = (unsigned long)-val; 1961 } else { 1962 *negp = 0; 1963 lval = (unsigned long)val; 1964 } 1965 *lvalp = jiffies_to_msecs(lval); 1966 } 1967 return 0; 1968 } 1969 1970 /** 1971 * proc_dointvec_jiffies - read a vector of integers as seconds 1972 * @table: the sysctl table 1973 * @write: %TRUE if this is a write to the sysctl file 1974 * @filp: the file structure 1975 * @buffer: the user buffer 1976 * @lenp: the size of the user buffer 1977 * @ppos: file position 1978 * 1979 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 1980 * values from/to the user buffer, treated as an ASCII string. 1981 * The values read are assumed to be in seconds, and are converted into 1982 * jiffies. 1983 * 1984 * Returns 0 on success. 1985 */ 1986 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 1987 void __user *buffer, size_t *lenp, loff_t *ppos) 1988 { 1989 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 1990 do_proc_dointvec_jiffies_conv,NULL); 1991 } 1992 1993 /** 1994 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds 1995 * @table: the sysctl table 1996 * @write: %TRUE if this is a write to the sysctl file 1997 * @filp: the file structure 1998 * @buffer: the user buffer 1999 * @lenp: the size of the user buffer 2000 * 2001 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2002 * values from/to the user buffer, treated as an ASCII string. 2003 * The values read are assumed to be in 1/USER_HZ seconds, and 2004 * are converted into jiffies. 2005 * 2006 * Returns 0 on success. 2007 */ 2008 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2009 void __user *buffer, size_t *lenp, loff_t *ppos) 2010 { 2011 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos, 2012 do_proc_dointvec_userhz_jiffies_conv,NULL); 2013 } 2014 2015 /** 2016 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds 2017 * @table: the sysctl table 2018 * @write: %TRUE if this is a write to the sysctl file 2019 * @filp: the file structure 2020 * @buffer: the user buffer 2021 * @lenp: the size of the user buffer 2022 * @ppos: file position 2023 * @ppos: the current position in the file 2024 * 2025 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer 2026 * values from/to the user buffer, treated as an ASCII string. 2027 * The values read are assumed to be in 1/1000 seconds, and 2028 * are converted into jiffies. 2029 * 2030 * Returns 0 on success. 2031 */ 2032 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2033 void __user *buffer, size_t *lenp, loff_t *ppos) 2034 { 2035 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos, 2036 do_proc_dointvec_ms_jiffies_conv, NULL); 2037 } 2038 2039 #else /* CONFIG_PROC_FS */ 2040 2041 int proc_dostring(ctl_table *table, int write, struct file *filp, 2042 void __user *buffer, size_t *lenp, loff_t *ppos) 2043 { 2044 return -ENOSYS; 2045 } 2046 2047 static int proc_doutsstring(ctl_table *table, int write, struct file *filp, 2048 void __user *buffer, size_t *lenp, loff_t *ppos) 2049 { 2050 return -ENOSYS; 2051 } 2052 2053 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2054 void __user *buffer, size_t *lenp, loff_t *ppos) 2055 { 2056 return -ENOSYS; 2057 } 2058 2059 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2060 void __user *buffer, size_t *lenp, loff_t *ppos) 2061 { 2062 return -ENOSYS; 2063 } 2064 2065 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2066 void __user *buffer, size_t *lenp, loff_t *ppos) 2067 { 2068 return -ENOSYS; 2069 } 2070 2071 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2072 void __user *buffer, size_t *lenp, loff_t *ppos) 2073 { 2074 return -ENOSYS; 2075 } 2076 2077 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2078 void __user *buffer, size_t *lenp, loff_t *ppos) 2079 { 2080 return -ENOSYS; 2081 } 2082 2083 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2084 void __user *buffer, size_t *lenp, loff_t *ppos) 2085 { 2086 return -ENOSYS; 2087 } 2088 2089 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2090 void __user *buffer, size_t *lenp, loff_t *ppos) 2091 { 2092 return -ENOSYS; 2093 } 2094 2095 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2096 struct file *filp, 2097 void __user *buffer, 2098 size_t *lenp, loff_t *ppos) 2099 { 2100 return -ENOSYS; 2101 } 2102 2103 2104 #endif /* CONFIG_PROC_FS */ 2105 2106 2107 /* 2108 * General sysctl support routines 2109 */ 2110 2111 /* The generic string strategy routine: */ 2112 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2113 void __user *oldval, size_t __user *oldlenp, 2114 void __user *newval, size_t newlen, void **context) 2115 { 2116 size_t l, len; 2117 2118 if (!table->data || !table->maxlen) 2119 return -ENOTDIR; 2120 2121 if (oldval && oldlenp) { 2122 if (get_user(len, oldlenp)) 2123 return -EFAULT; 2124 if (len) { 2125 l = strlen(table->data); 2126 if (len > l) len = l; 2127 if (len >= table->maxlen) 2128 len = table->maxlen; 2129 if(copy_to_user(oldval, table->data, len)) 2130 return -EFAULT; 2131 if(put_user(0, ((char __user *) oldval) + len)) 2132 return -EFAULT; 2133 if(put_user(len, oldlenp)) 2134 return -EFAULT; 2135 } 2136 } 2137 if (newval && newlen) { 2138 len = newlen; 2139 if (len > table->maxlen) 2140 len = table->maxlen; 2141 if(copy_from_user(table->data, newval, len)) 2142 return -EFAULT; 2143 if (len == table->maxlen) 2144 len--; 2145 ((char *) table->data)[len] = 0; 2146 } 2147 return 0; 2148 } 2149 2150 /* 2151 * This function makes sure that all of the integers in the vector 2152 * are between the minimum and maximum values given in the arrays 2153 * table->extra1 and table->extra2, respectively. 2154 */ 2155 int sysctl_intvec(ctl_table *table, int __user *name, int nlen, 2156 void __user *oldval, size_t __user *oldlenp, 2157 void __user *newval, size_t newlen, void **context) 2158 { 2159 2160 if (newval && newlen) { 2161 int __user *vec = (int __user *) newval; 2162 int *min = (int *) table->extra1; 2163 int *max = (int *) table->extra2; 2164 size_t length; 2165 int i; 2166 2167 if (newlen % sizeof(int) != 0) 2168 return -EINVAL; 2169 2170 if (!table->extra1 && !table->extra2) 2171 return 0; 2172 2173 if (newlen > table->maxlen) 2174 newlen = table->maxlen; 2175 length = newlen / sizeof(int); 2176 2177 for (i = 0; i < length; i++) { 2178 int value; 2179 if (get_user(value, vec + i)) 2180 return -EFAULT; 2181 if (min && value < min[i]) 2182 return -EINVAL; 2183 if (max && value > max[i]) 2184 return -EINVAL; 2185 } 2186 } 2187 return 0; 2188 } 2189 2190 /* Strategy function to convert jiffies to seconds */ 2191 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2192 void __user *oldval, size_t __user *oldlenp, 2193 void __user *newval, size_t newlen, void **context) 2194 { 2195 if (oldval) { 2196 size_t olen; 2197 if (oldlenp) { 2198 if (get_user(olen, oldlenp)) 2199 return -EFAULT; 2200 if (olen!=sizeof(int)) 2201 return -EINVAL; 2202 } 2203 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) || 2204 (oldlenp && put_user(sizeof(int),oldlenp))) 2205 return -EFAULT; 2206 } 2207 if (newval && newlen) { 2208 int new; 2209 if (newlen != sizeof(int)) 2210 return -EINVAL; 2211 if (get_user(new, (int __user *)newval)) 2212 return -EFAULT; 2213 *(int *)(table->data) = new*HZ; 2214 } 2215 return 1; 2216 } 2217 2218 /* Strategy function to convert jiffies to seconds */ 2219 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2220 void __user *oldval, size_t __user *oldlenp, 2221 void __user *newval, size_t newlen, void **context) 2222 { 2223 if (oldval) { 2224 size_t olen; 2225 if (oldlenp) { 2226 if (get_user(olen, oldlenp)) 2227 return -EFAULT; 2228 if (olen!=sizeof(int)) 2229 return -EINVAL; 2230 } 2231 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) || 2232 (oldlenp && put_user(sizeof(int),oldlenp))) 2233 return -EFAULT; 2234 } 2235 if (newval && newlen) { 2236 int new; 2237 if (newlen != sizeof(int)) 2238 return -EINVAL; 2239 if (get_user(new, (int __user *)newval)) 2240 return -EFAULT; 2241 *(int *)(table->data) = msecs_to_jiffies(new); 2242 } 2243 return 1; 2244 } 2245 2246 #else /* CONFIG_SYSCTL */ 2247 2248 2249 asmlinkage long sys_sysctl(struct __sysctl_args __user *args) 2250 { 2251 return -ENOSYS; 2252 } 2253 2254 int sysctl_string(ctl_table *table, int __user *name, int nlen, 2255 void __user *oldval, size_t __user *oldlenp, 2256 void __user *newval, size_t newlen, void **context) 2257 { 2258 return -ENOSYS; 2259 } 2260 2261 int sysctl_intvec(ctl_table *table, int __user *name, int nlen, 2262 void __user *oldval, size_t __user *oldlenp, 2263 void __user *newval, size_t newlen, void **context) 2264 { 2265 return -ENOSYS; 2266 } 2267 2268 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen, 2269 void __user *oldval, size_t __user *oldlenp, 2270 void __user *newval, size_t newlen, void **context) 2271 { 2272 return -ENOSYS; 2273 } 2274 2275 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen, 2276 void __user *oldval, size_t __user *oldlenp, 2277 void __user *newval, size_t newlen, void **context) 2278 { 2279 return -ENOSYS; 2280 } 2281 2282 int proc_dostring(ctl_table *table, int write, struct file *filp, 2283 void __user *buffer, size_t *lenp, loff_t *ppos) 2284 { 2285 return -ENOSYS; 2286 } 2287 2288 int proc_dointvec(ctl_table *table, int write, struct file *filp, 2289 void __user *buffer, size_t *lenp, loff_t *ppos) 2290 { 2291 return -ENOSYS; 2292 } 2293 2294 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, 2295 void __user *buffer, size_t *lenp, loff_t *ppos) 2296 { 2297 return -ENOSYS; 2298 } 2299 2300 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, 2301 void __user *buffer, size_t *lenp, loff_t *ppos) 2302 { 2303 return -ENOSYS; 2304 } 2305 2306 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, 2307 void __user *buffer, size_t *lenp, loff_t *ppos) 2308 { 2309 return -ENOSYS; 2310 } 2311 2312 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp, 2313 void __user *buffer, size_t *lenp, loff_t *ppos) 2314 { 2315 return -ENOSYS; 2316 } 2317 2318 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp, 2319 void __user *buffer, size_t *lenp, loff_t *ppos) 2320 { 2321 return -ENOSYS; 2322 } 2323 2324 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, 2325 void __user *buffer, size_t *lenp, loff_t *ppos) 2326 { 2327 return -ENOSYS; 2328 } 2329 2330 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, 2331 struct file *filp, 2332 void __user *buffer, 2333 size_t *lenp, loff_t *ppos) 2334 { 2335 return -ENOSYS; 2336 } 2337 2338 struct ctl_table_header * register_sysctl_table(ctl_table * table, 2339 int insert_at_head) 2340 { 2341 return NULL; 2342 } 2343 2344 void unregister_sysctl_table(struct ctl_table_header * table) 2345 { 2346 } 2347 2348 #endif /* CONFIG_SYSCTL */ 2349 2350 /* 2351 * No sense putting this after each symbol definition, twice, 2352 * exception granted :-) 2353 */ 2354 EXPORT_SYMBOL(proc_dointvec); 2355 EXPORT_SYMBOL(proc_dointvec_jiffies); 2356 EXPORT_SYMBOL(proc_dointvec_minmax); 2357 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies); 2358 EXPORT_SYMBOL(proc_dointvec_ms_jiffies); 2359 EXPORT_SYMBOL(proc_dostring); 2360 EXPORT_SYMBOL(proc_doulongvec_minmax); 2361 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax); 2362 EXPORT_SYMBOL(register_sysctl_table); 2363 EXPORT_SYMBOL(sysctl_intvec); 2364 EXPORT_SYMBOL(sysctl_jiffies); 2365 EXPORT_SYMBOL(sysctl_ms_jiffies); 2366 EXPORT_SYMBOL(sysctl_string); 2367 EXPORT_SYMBOL(unregister_sysctl_table); 2368