1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/kernel/panic.c 4 * 5 * Copyright (C) 1991, 1992 Linus Torvalds 6 */ 7 8 /* 9 * This function is used through-out the kernel (including mm and fs) 10 * to indicate a major problem. 11 */ 12 #include <linux/debug_locks.h> 13 #include <linux/sched/debug.h> 14 #include <linux/interrupt.h> 15 #include <linux/kgdb.h> 16 #include <linux/kmsg_dump.h> 17 #include <linux/kallsyms.h> 18 #include <linux/notifier.h> 19 #include <linux/vt_kern.h> 20 #include <linux/module.h> 21 #include <linux/random.h> 22 #include <linux/ftrace.h> 23 #include <linux/reboot.h> 24 #include <linux/delay.h> 25 #include <linux/kexec.h> 26 #include <linux/sched.h> 27 #include <linux/sysrq.h> 28 #include <linux/init.h> 29 #include <linux/nmi.h> 30 #include <linux/console.h> 31 #include <linux/bug.h> 32 #include <linux/ratelimit.h> 33 #include <linux/debugfs.h> 34 #include <asm/sections.h> 35 36 #define PANIC_TIMER_STEP 100 37 #define PANIC_BLINK_SPD 18 38 39 #ifdef CONFIG_SMP 40 /* 41 * Should we dump all CPUs backtraces in an oops event? 42 * Defaults to 0, can be changed via sysctl. 43 */ 44 unsigned int __read_mostly sysctl_oops_all_cpu_backtrace; 45 #endif /* CONFIG_SMP */ 46 47 int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE; 48 static unsigned long tainted_mask = 49 IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0; 50 static int pause_on_oops; 51 static int pause_on_oops_flag; 52 static DEFINE_SPINLOCK(pause_on_oops_lock); 53 bool crash_kexec_post_notifiers; 54 int panic_on_warn __read_mostly; 55 unsigned long panic_on_taint; 56 bool panic_on_taint_nousertaint = false; 57 58 int panic_timeout = CONFIG_PANIC_TIMEOUT; 59 EXPORT_SYMBOL_GPL(panic_timeout); 60 61 #define PANIC_PRINT_TASK_INFO 0x00000001 62 #define PANIC_PRINT_MEM_INFO 0x00000002 63 #define PANIC_PRINT_TIMER_INFO 0x00000004 64 #define PANIC_PRINT_LOCK_INFO 0x00000008 65 #define PANIC_PRINT_FTRACE_INFO 0x00000010 66 #define PANIC_PRINT_ALL_PRINTK_MSG 0x00000020 67 unsigned long panic_print; 68 69 ATOMIC_NOTIFIER_HEAD(panic_notifier_list); 70 71 EXPORT_SYMBOL(panic_notifier_list); 72 73 static long no_blink(int state) 74 { 75 return 0; 76 } 77 78 /* Returns how long it waited in ms */ 79 long (*panic_blink)(int state); 80 EXPORT_SYMBOL(panic_blink); 81 82 /* 83 * Stop ourself in panic -- architecture code may override this 84 */ 85 void __weak panic_smp_self_stop(void) 86 { 87 while (1) 88 cpu_relax(); 89 } 90 91 /* 92 * Stop ourselves in NMI context if another CPU has already panicked. Arch code 93 * may override this to prepare for crash dumping, e.g. save regs info. 94 */ 95 void __weak nmi_panic_self_stop(struct pt_regs *regs) 96 { 97 panic_smp_self_stop(); 98 } 99 100 /* 101 * Stop other CPUs in panic. Architecture dependent code may override this 102 * with more suitable version. For example, if the architecture supports 103 * crash dump, it should save registers of each stopped CPU and disable 104 * per-CPU features such as virtualization extensions. 105 */ 106 void __weak crash_smp_send_stop(void) 107 { 108 static int cpus_stopped; 109 110 /* 111 * This function can be called twice in panic path, but obviously 112 * we execute this only once. 113 */ 114 if (cpus_stopped) 115 return; 116 117 /* 118 * Note smp_send_stop is the usual smp shutdown function, which 119 * unfortunately means it may not be hardened to work in a panic 120 * situation. 121 */ 122 smp_send_stop(); 123 cpus_stopped = 1; 124 } 125 126 atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID); 127 128 /* 129 * A variant of panic() called from NMI context. We return if we've already 130 * panicked on this CPU. If another CPU already panicked, loop in 131 * nmi_panic_self_stop() which can provide architecture dependent code such 132 * as saving register state for crash dump. 133 */ 134 void nmi_panic(struct pt_regs *regs, const char *msg) 135 { 136 int old_cpu, cpu; 137 138 cpu = raw_smp_processor_id(); 139 old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu); 140 141 if (old_cpu == PANIC_CPU_INVALID) 142 panic("%s", msg); 143 else if (old_cpu != cpu) 144 nmi_panic_self_stop(regs); 145 } 146 EXPORT_SYMBOL(nmi_panic); 147 148 static void panic_print_sys_info(void) 149 { 150 if (panic_print & PANIC_PRINT_ALL_PRINTK_MSG) 151 console_flush_on_panic(CONSOLE_REPLAY_ALL); 152 153 if (panic_print & PANIC_PRINT_TASK_INFO) 154 show_state(); 155 156 if (panic_print & PANIC_PRINT_MEM_INFO) 157 show_mem(0, NULL); 158 159 if (panic_print & PANIC_PRINT_TIMER_INFO) 160 sysrq_timer_list_show(); 161 162 if (panic_print & PANIC_PRINT_LOCK_INFO) 163 debug_show_all_locks(); 164 165 if (panic_print & PANIC_PRINT_FTRACE_INFO) 166 ftrace_dump(DUMP_ALL); 167 } 168 169 /** 170 * panic - halt the system 171 * @fmt: The text string to print 172 * 173 * Display a message, then perform cleanups. 174 * 175 * This function never returns. 176 */ 177 void panic(const char *fmt, ...) 178 { 179 static char buf[1024]; 180 va_list args; 181 long i, i_next = 0, len; 182 int state = 0; 183 int old_cpu, this_cpu; 184 bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers; 185 186 /* 187 * Disable local interrupts. This will prevent panic_smp_self_stop 188 * from deadlocking the first cpu that invokes the panic, since 189 * there is nothing to prevent an interrupt handler (that runs 190 * after setting panic_cpu) from invoking panic() again. 191 */ 192 local_irq_disable(); 193 preempt_disable_notrace(); 194 195 /* 196 * It's possible to come here directly from a panic-assertion and 197 * not have preempt disabled. Some functions called from here want 198 * preempt to be disabled. No point enabling it later though... 199 * 200 * Only one CPU is allowed to execute the panic code from here. For 201 * multiple parallel invocations of panic, all other CPUs either 202 * stop themself or will wait until they are stopped by the 1st CPU 203 * with smp_send_stop(). 204 * 205 * `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which 206 * comes here, so go ahead. 207 * `old_cpu == this_cpu' means we came from nmi_panic() which sets 208 * panic_cpu to this CPU. In this case, this is also the 1st CPU. 209 */ 210 this_cpu = raw_smp_processor_id(); 211 old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu); 212 213 if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu) 214 panic_smp_self_stop(); 215 216 console_verbose(); 217 bust_spinlocks(1); 218 va_start(args, fmt); 219 len = vscnprintf(buf, sizeof(buf), fmt, args); 220 va_end(args); 221 222 if (len && buf[len - 1] == '\n') 223 buf[len - 1] = '\0'; 224 225 pr_emerg("Kernel panic - not syncing: %s\n", buf); 226 #ifdef CONFIG_DEBUG_BUGVERBOSE 227 /* 228 * Avoid nested stack-dumping if a panic occurs during oops processing 229 */ 230 if (!test_taint(TAINT_DIE) && oops_in_progress <= 1) 231 dump_stack(); 232 #endif 233 234 /* 235 * If kgdb is enabled, give it a chance to run before we stop all 236 * the other CPUs or else we won't be able to debug processes left 237 * running on them. 238 */ 239 kgdb_panic(buf); 240 241 /* 242 * If we have crashed and we have a crash kernel loaded let it handle 243 * everything else. 244 * If we want to run this after calling panic_notifiers, pass 245 * the "crash_kexec_post_notifiers" option to the kernel. 246 * 247 * Bypass the panic_cpu check and call __crash_kexec directly. 248 */ 249 if (!_crash_kexec_post_notifiers) { 250 printk_safe_flush_on_panic(); 251 __crash_kexec(NULL); 252 253 /* 254 * Note smp_send_stop is the usual smp shutdown function, which 255 * unfortunately means it may not be hardened to work in a 256 * panic situation. 257 */ 258 smp_send_stop(); 259 } else { 260 /* 261 * If we want to do crash dump after notifier calls and 262 * kmsg_dump, we will need architecture dependent extra 263 * works in addition to stopping other CPUs. 264 */ 265 crash_smp_send_stop(); 266 } 267 268 /* 269 * Run any panic handlers, including those that might need to 270 * add information to the kmsg dump output. 271 */ 272 atomic_notifier_call_chain(&panic_notifier_list, 0, buf); 273 274 /* Call flush even twice. It tries harder with a single online CPU */ 275 printk_safe_flush_on_panic(); 276 kmsg_dump(KMSG_DUMP_PANIC); 277 278 /* 279 * If you doubt kdump always works fine in any situation, 280 * "crash_kexec_post_notifiers" offers you a chance to run 281 * panic_notifiers and dumping kmsg before kdump. 282 * Note: since some panic_notifiers can make crashed kernel 283 * more unstable, it can increase risks of the kdump failure too. 284 * 285 * Bypass the panic_cpu check and call __crash_kexec directly. 286 */ 287 if (_crash_kexec_post_notifiers) 288 __crash_kexec(NULL); 289 290 #ifdef CONFIG_VT 291 unblank_screen(); 292 #endif 293 console_unblank(); 294 295 /* 296 * We may have ended up stopping the CPU holding the lock (in 297 * smp_send_stop()) while still having some valuable data in the console 298 * buffer. Try to acquire the lock then release it regardless of the 299 * result. The release will also print the buffers out. Locks debug 300 * should be disabled to avoid reporting bad unlock balance when 301 * panic() is not being callled from OOPS. 302 */ 303 debug_locks_off(); 304 console_flush_on_panic(CONSOLE_FLUSH_PENDING); 305 306 panic_print_sys_info(); 307 308 if (!panic_blink) 309 panic_blink = no_blink; 310 311 if (panic_timeout > 0) { 312 /* 313 * Delay timeout seconds before rebooting the machine. 314 * We can't use the "normal" timers since we just panicked. 315 */ 316 pr_emerg("Rebooting in %d seconds..\n", panic_timeout); 317 318 for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) { 319 touch_nmi_watchdog(); 320 if (i >= i_next) { 321 i += panic_blink(state ^= 1); 322 i_next = i + 3600 / PANIC_BLINK_SPD; 323 } 324 mdelay(PANIC_TIMER_STEP); 325 } 326 } 327 if (panic_timeout != 0) { 328 /* 329 * This will not be a clean reboot, with everything 330 * shutting down. But if there is a chance of 331 * rebooting the system it will be rebooted. 332 */ 333 if (panic_reboot_mode != REBOOT_UNDEFINED) 334 reboot_mode = panic_reboot_mode; 335 emergency_restart(); 336 } 337 #ifdef __sparc__ 338 { 339 extern int stop_a_enabled; 340 /* Make sure the user can actually press Stop-A (L1-A) */ 341 stop_a_enabled = 1; 342 pr_emerg("Press Stop-A (L1-A) from sun keyboard or send break\n" 343 "twice on console to return to the boot prom\n"); 344 } 345 #endif 346 #if defined(CONFIG_S390) 347 disabled_wait(); 348 #endif 349 pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf); 350 351 /* Do not scroll important messages printed above */ 352 suppress_printk = 1; 353 local_irq_enable(); 354 for (i = 0; ; i += PANIC_TIMER_STEP) { 355 touch_softlockup_watchdog(); 356 if (i >= i_next) { 357 i += panic_blink(state ^= 1); 358 i_next = i + 3600 / PANIC_BLINK_SPD; 359 } 360 mdelay(PANIC_TIMER_STEP); 361 } 362 } 363 364 EXPORT_SYMBOL(panic); 365 366 /* 367 * TAINT_FORCED_RMMOD could be a per-module flag but the module 368 * is being removed anyway. 369 */ 370 const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = { 371 [ TAINT_PROPRIETARY_MODULE ] = { 'P', 'G', true }, 372 [ TAINT_FORCED_MODULE ] = { 'F', ' ', true }, 373 [ TAINT_CPU_OUT_OF_SPEC ] = { 'S', ' ', false }, 374 [ TAINT_FORCED_RMMOD ] = { 'R', ' ', false }, 375 [ TAINT_MACHINE_CHECK ] = { 'M', ' ', false }, 376 [ TAINT_BAD_PAGE ] = { 'B', ' ', false }, 377 [ TAINT_USER ] = { 'U', ' ', false }, 378 [ TAINT_DIE ] = { 'D', ' ', false }, 379 [ TAINT_OVERRIDDEN_ACPI_TABLE ] = { 'A', ' ', false }, 380 [ TAINT_WARN ] = { 'W', ' ', false }, 381 [ TAINT_CRAP ] = { 'C', ' ', true }, 382 [ TAINT_FIRMWARE_WORKAROUND ] = { 'I', ' ', false }, 383 [ TAINT_OOT_MODULE ] = { 'O', ' ', true }, 384 [ TAINT_UNSIGNED_MODULE ] = { 'E', ' ', true }, 385 [ TAINT_SOFTLOCKUP ] = { 'L', ' ', false }, 386 [ TAINT_LIVEPATCH ] = { 'K', ' ', true }, 387 [ TAINT_AUX ] = { 'X', ' ', true }, 388 [ TAINT_RANDSTRUCT ] = { 'T', ' ', true }, 389 }; 390 391 /** 392 * print_tainted - return a string to represent the kernel taint state. 393 * 394 * For individual taint flag meanings, see Documentation/admin-guide/sysctl/kernel.rst 395 * 396 * The string is overwritten by the next call to print_tainted(), 397 * but is always NULL terminated. 398 */ 399 const char *print_tainted(void) 400 { 401 static char buf[TAINT_FLAGS_COUNT + sizeof("Tainted: ")]; 402 403 BUILD_BUG_ON(ARRAY_SIZE(taint_flags) != TAINT_FLAGS_COUNT); 404 405 if (tainted_mask) { 406 char *s; 407 int i; 408 409 s = buf + sprintf(buf, "Tainted: "); 410 for (i = 0; i < TAINT_FLAGS_COUNT; i++) { 411 const struct taint_flag *t = &taint_flags[i]; 412 *s++ = test_bit(i, &tainted_mask) ? 413 t->c_true : t->c_false; 414 } 415 *s = 0; 416 } else 417 snprintf(buf, sizeof(buf), "Not tainted"); 418 419 return buf; 420 } 421 422 int test_taint(unsigned flag) 423 { 424 return test_bit(flag, &tainted_mask); 425 } 426 EXPORT_SYMBOL(test_taint); 427 428 unsigned long get_taint(void) 429 { 430 return tainted_mask; 431 } 432 433 /** 434 * add_taint: add a taint flag if not already set. 435 * @flag: one of the TAINT_* constants. 436 * @lockdep_ok: whether lock debugging is still OK. 437 * 438 * If something bad has gone wrong, you'll want @lockdebug_ok = false, but for 439 * some notewortht-but-not-corrupting cases, it can be set to true. 440 */ 441 void add_taint(unsigned flag, enum lockdep_ok lockdep_ok) 442 { 443 if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off()) 444 pr_warn("Disabling lock debugging due to kernel taint\n"); 445 446 set_bit(flag, &tainted_mask); 447 448 if (tainted_mask & panic_on_taint) { 449 panic_on_taint = 0; 450 panic("panic_on_taint set ..."); 451 } 452 } 453 EXPORT_SYMBOL(add_taint); 454 455 static void spin_msec(int msecs) 456 { 457 int i; 458 459 for (i = 0; i < msecs; i++) { 460 touch_nmi_watchdog(); 461 mdelay(1); 462 } 463 } 464 465 /* 466 * It just happens that oops_enter() and oops_exit() are identically 467 * implemented... 468 */ 469 static void do_oops_enter_exit(void) 470 { 471 unsigned long flags; 472 static int spin_counter; 473 474 if (!pause_on_oops) 475 return; 476 477 spin_lock_irqsave(&pause_on_oops_lock, flags); 478 if (pause_on_oops_flag == 0) { 479 /* This CPU may now print the oops message */ 480 pause_on_oops_flag = 1; 481 } else { 482 /* We need to stall this CPU */ 483 if (!spin_counter) { 484 /* This CPU gets to do the counting */ 485 spin_counter = pause_on_oops; 486 do { 487 spin_unlock(&pause_on_oops_lock); 488 spin_msec(MSEC_PER_SEC); 489 spin_lock(&pause_on_oops_lock); 490 } while (--spin_counter); 491 pause_on_oops_flag = 0; 492 } else { 493 /* This CPU waits for a different one */ 494 while (spin_counter) { 495 spin_unlock(&pause_on_oops_lock); 496 spin_msec(1); 497 spin_lock(&pause_on_oops_lock); 498 } 499 } 500 } 501 spin_unlock_irqrestore(&pause_on_oops_lock, flags); 502 } 503 504 /* 505 * Return true if the calling CPU is allowed to print oops-related info. 506 * This is a bit racy.. 507 */ 508 bool oops_may_print(void) 509 { 510 return pause_on_oops_flag == 0; 511 } 512 513 /* 514 * Called when the architecture enters its oops handler, before it prints 515 * anything. If this is the first CPU to oops, and it's oopsing the first 516 * time then let it proceed. 517 * 518 * This is all enabled by the pause_on_oops kernel boot option. We do all 519 * this to ensure that oopses don't scroll off the screen. It has the 520 * side-effect of preventing later-oopsing CPUs from mucking up the display, 521 * too. 522 * 523 * It turns out that the CPU which is allowed to print ends up pausing for 524 * the right duration, whereas all the other CPUs pause for twice as long: 525 * once in oops_enter(), once in oops_exit(). 526 */ 527 void oops_enter(void) 528 { 529 tracing_off(); 530 /* can't trust the integrity of the kernel anymore: */ 531 debug_locks_off(); 532 do_oops_enter_exit(); 533 534 if (sysctl_oops_all_cpu_backtrace) 535 trigger_all_cpu_backtrace(); 536 } 537 538 /* 539 * 64-bit random ID for oopses: 540 */ 541 static u64 oops_id; 542 543 static int init_oops_id(void) 544 { 545 if (!oops_id) 546 get_random_bytes(&oops_id, sizeof(oops_id)); 547 else 548 oops_id++; 549 550 return 0; 551 } 552 late_initcall(init_oops_id); 553 554 static void print_oops_end_marker(void) 555 { 556 init_oops_id(); 557 pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id); 558 } 559 560 /* 561 * Called when the architecture exits its oops handler, after printing 562 * everything. 563 */ 564 void oops_exit(void) 565 { 566 do_oops_enter_exit(); 567 print_oops_end_marker(); 568 kmsg_dump(KMSG_DUMP_OOPS); 569 } 570 571 struct warn_args { 572 const char *fmt; 573 va_list args; 574 }; 575 576 void __warn(const char *file, int line, void *caller, unsigned taint, 577 struct pt_regs *regs, struct warn_args *args) 578 { 579 disable_trace_on_warning(); 580 581 if (file) 582 pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS\n", 583 raw_smp_processor_id(), current->pid, file, line, 584 caller); 585 else 586 pr_warn("WARNING: CPU: %d PID: %d at %pS\n", 587 raw_smp_processor_id(), current->pid, caller); 588 589 if (args) 590 vprintk(args->fmt, args->args); 591 592 print_modules(); 593 594 if (regs) 595 show_regs(regs); 596 597 if (panic_on_warn) { 598 /* 599 * This thread may hit another WARN() in the panic path. 600 * Resetting this prevents additional WARN() from panicking the 601 * system on this thread. Other threads are blocked by the 602 * panic_mutex in panic(). 603 */ 604 panic_on_warn = 0; 605 panic("panic_on_warn set ...\n"); 606 } 607 608 if (!regs) 609 dump_stack(); 610 611 print_irqtrace_events(current); 612 613 print_oops_end_marker(); 614 615 /* Just a warning, don't kill lockdep. */ 616 add_taint(taint, LOCKDEP_STILL_OK); 617 } 618 619 #ifndef __WARN_FLAGS 620 void warn_slowpath_fmt(const char *file, int line, unsigned taint, 621 const char *fmt, ...) 622 { 623 struct warn_args args; 624 625 pr_warn(CUT_HERE); 626 627 if (!fmt) { 628 __warn(file, line, __builtin_return_address(0), taint, 629 NULL, NULL); 630 return; 631 } 632 633 args.fmt = fmt; 634 va_start(args.args, fmt); 635 __warn(file, line, __builtin_return_address(0), taint, NULL, &args); 636 va_end(args.args); 637 } 638 EXPORT_SYMBOL(warn_slowpath_fmt); 639 #else 640 void __warn_printk(const char *fmt, ...) 641 { 642 va_list args; 643 644 pr_warn(CUT_HERE); 645 646 va_start(args, fmt); 647 vprintk(fmt, args); 648 va_end(args); 649 } 650 EXPORT_SYMBOL(__warn_printk); 651 #endif 652 653 #ifdef CONFIG_BUG 654 655 /* Support resetting WARN*_ONCE state */ 656 657 static int clear_warn_once_set(void *data, u64 val) 658 { 659 generic_bug_clear_once(); 660 memset(__start_once, 0, __end_once - __start_once); 661 return 0; 662 } 663 664 DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set, 665 "%lld\n"); 666 667 static __init int register_warn_debugfs(void) 668 { 669 /* Don't care about failure */ 670 debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL, 671 &clear_warn_once_fops); 672 return 0; 673 } 674 675 device_initcall(register_warn_debugfs); 676 #endif 677 678 #ifdef CONFIG_STACKPROTECTOR 679 680 /* 681 * Called when gcc's -fstack-protector feature is used, and 682 * gcc detects corruption of the on-stack canary value 683 */ 684 __visible noinstr void __stack_chk_fail(void) 685 { 686 instrumentation_begin(); 687 panic("stack-protector: Kernel stack is corrupted in: %pB", 688 __builtin_return_address(0)); 689 instrumentation_end(); 690 } 691 EXPORT_SYMBOL(__stack_chk_fail); 692 693 #endif 694 695 core_param(panic, panic_timeout, int, 0644); 696 core_param(panic_print, panic_print, ulong, 0644); 697 core_param(pause_on_oops, pause_on_oops, int, 0644); 698 core_param(panic_on_warn, panic_on_warn, int, 0644); 699 core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644); 700 701 static int __init oops_setup(char *s) 702 { 703 if (!s) 704 return -EINVAL; 705 if (!strcmp(s, "panic")) 706 panic_on_oops = 1; 707 return 0; 708 } 709 early_param("oops", oops_setup); 710 711 static int __init panic_on_taint_setup(char *s) 712 { 713 char *taint_str; 714 715 if (!s) 716 return -EINVAL; 717 718 taint_str = strsep(&s, ","); 719 if (kstrtoul(taint_str, 16, &panic_on_taint)) 720 return -EINVAL; 721 722 /* make sure panic_on_taint doesn't hold out-of-range TAINT flags */ 723 panic_on_taint &= TAINT_FLAGS_MAX; 724 725 if (!panic_on_taint) 726 return -EINVAL; 727 728 if (s && !strcmp(s, "nousertaint")) 729 panic_on_taint_nousertaint = true; 730 731 pr_info("panic_on_taint: bitmask=0x%lx nousertaint_mode=%sabled\n", 732 panic_on_taint, panic_on_taint_nousertaint ? "en" : "dis"); 733 734 return 0; 735 } 736 early_param("panic_on_taint", panic_on_taint_setup); 737