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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/kernel/panic.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7/*
8 * This function is used through-out the kernel (including mm and fs)
9 * to indicate a major problem.
10 */
Andrew Morton657b3012006-08-13 23:24:19 -070011#include <linux/debug_locks.h>
Ingo Molnarc95dbf272009-03-13 11:14:06 +010012#include <linux/interrupt.h>
Simon Kagstrom456b5652009-10-16 14:09:18 +020013#include <linux/kmsg_dump.h>
Arjan van de Ven79b4cc52008-01-30 13:32:50 +010014#include <linux/kallsyms.h>
Ingo Molnarc95dbf272009-03-13 11:14:06 +010015#include <linux/notifier.h>
16#include <linux/module.h>
17#include <linux/random.h>
Steven Rostedt (Red Hat)de7edd32013-06-14 16:21:43 -040018#include <linux/ftrace.h>
Ingo Molnarc95dbf272009-03-13 11:14:06 +010019#include <linux/reboot.h>
20#include <linux/delay.h>
21#include <linux/kexec.h>
22#include <linux/sched.h>
23#include <linux/sysrq.h>
24#include <linux/init.h>
25#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070027#define PANIC_TIMER_STEP 100
28#define PANIC_BLINK_SPD 18
29
Kyle McMartin2a01bb32012-04-11 08:15:29 -040030int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
Andi Kleen25ddbb12008-10-15 22:01:41 -070031static unsigned long tainted_mask;
Andrew Mortondd287792006-03-23 03:00:57 -080032static int pause_on_oops;
33static int pause_on_oops_flag;
34static DEFINE_SPINLOCK(pause_on_oops_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Jason Baron5800dc32013-11-25 23:23:04 +000036int panic_timeout = CONFIG_PANIC_TIMEOUT;
Huang Ying81e88fd2011-01-12 14:44:55 +080037EXPORT_SYMBOL_GPL(panic_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Alan Sterne041c682006-03-27 01:16:30 -080039ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41EXPORT_SYMBOL(panic_notifier_list);
42
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070043static long no_blink(int state)
Anton Blanchard8aeee852010-03-05 13:42:55 -080044{
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070045 return 0;
Anton Blanchard8aeee852010-03-05 13:42:55 -080046}
47
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070048/* Returns how long it waited in ms */
49long (*panic_blink)(int state);
50EXPORT_SYMBOL(panic_blink);
51
Michael Holzheu93e13a32012-01-12 17:20:18 -080052/*
53 * Stop ourself in panic -- architecture code may override this
54 */
55void __weak panic_smp_self_stop(void)
56{
57 while (1)
58 cpu_relax();
59}
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061/**
62 * panic - halt the system
63 * @fmt: The text string to print
64 *
65 * Display a message, then perform cleanups.
66 *
67 * This function never returns.
68 */
Joe Perches9402c952012-01-12 17:17:17 -080069void panic(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Michael Holzheu93e13a32012-01-12 17:20:18 -080071 static DEFINE_SPINLOCK(panic_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 static char buf[1024];
73 va_list args;
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070074 long i, i_next = 0;
75 int state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Eric W. Biedermandc009d92005-06-25 14:57:52 -070077 /*
Vikram Mulukutla190320c2012-07-30 14:39:58 -070078 * Disable local interrupts. This will prevent panic_smp_self_stop
79 * from deadlocking the first cpu that invokes the panic, since
80 * there is nothing to prevent an interrupt handler (that runs
81 * after the panic_lock is acquired) from invoking panic again.
82 */
83 local_irq_disable();
84
85 /*
Ingo Molnarc95dbf272009-03-13 11:14:06 +010086 * It's possible to come here directly from a panic-assertion and
87 * not have preempt disabled. Some functions called from here want
Eric W. Biedermandc009d92005-06-25 14:57:52 -070088 * preempt to be disabled. No point enabling it later though...
Michael Holzheu93e13a32012-01-12 17:20:18 -080089 *
90 * Only one CPU is allowed to execute the panic code from here. For
91 * multiple parallel invocations of panic, all other CPUs either
92 * stop themself or will wait until they are stopped by the 1st CPU
93 * with smp_send_stop().
Eric W. Biedermandc009d92005-06-25 14:57:52 -070094 */
Michael Holzheu93e13a32012-01-12 17:20:18 -080095 if (!spin_trylock(&panic_lock))
96 panic_smp_self_stop();
Eric W. Biedermandc009d92005-06-25 14:57:52 -070097
Anton Blanchard5b530fc2010-05-26 14:44:24 -070098 console_verbose();
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 bust_spinlocks(1);
100 va_start(args, fmt);
101 vsnprintf(buf, sizeof(buf), fmt, args);
102 va_end(args);
Fabian Frederickd7c08472014-04-07 15:39:03 -0700103 pr_emerg("Kernel panic - not syncing: %s\n", buf);
Ingo Molnar5cb27302008-02-14 09:07:01 +0100104#ifdef CONFIG_DEBUG_BUGVERBOSE
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800105 /*
106 * Avoid nested stack-dumping if a panic occurs during oops processing
107 */
Jason Wessel026ee1f2012-04-12 12:49:17 -0700108 if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800109 dump_stack();
Ingo Molnar5cb27302008-02-14 09:07:01 +0100110#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700112 /*
113 * If we have crashed and we have a crash kernel loaded let it handle
114 * everything else.
115 * Do we want to call this before we try to display a message?
116 */
Alexander Nyberg6e274d12005-06-25 14:58:26 -0700117 crash_kexec(NULL);
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700118
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700119 /*
120 * Note smp_send_stop is the usual smp shutdown function, which
121 * unfortunately means it may not be hardened to work in a panic
122 * situation.
123 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 smp_send_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Kees Cook67237342013-09-11 14:25:49 -0700126 /*
127 * Run any panic handlers, including those that might need to
128 * add information to the kmsg dump output.
129 */
Alan Sterne041c682006-03-27 01:16:30 -0800130 atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Kees Cook67237342013-09-11 14:25:49 -0700132 kmsg_dump(KMSG_DUMP_PANIC);
133
Aaro Koskinend014e8892009-10-02 14:41:20 +0300134 bust_spinlocks(0);
135
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700136 if (!panic_blink)
137 panic_blink = no_blink;
138
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700139 if (panic_timeout > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 /*
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100141 * Delay timeout seconds before rebooting the machine.
142 * We can't use the "normal" timers since we just panicked.
143 */
Fabian Frederickd7c08472014-04-07 15:39:03 -0700144 pr_emerg("Rebooting in %d seconds..", panic_timeout);
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100145
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700146 for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 touch_nmi_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700148 if (i >= i_next) {
149 i += panic_blink(state ^= 1);
150 i_next = i + 3600 / PANIC_BLINK_SPD;
151 }
152 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 }
Hugh Dickins4302fbc2011-07-26 16:08:52 -0700154 }
155 if (panic_timeout != 0) {
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100156 /*
157 * This will not be a clean reboot, with everything
158 * shutting down. But if there is a chance of
159 * rebooting the system it will be rebooted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 */
Eric W. Biederman2f048ea2005-07-26 11:49:23 -0600161 emergency_restart();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
163#ifdef __sparc__
164 {
165 extern int stop_a_enabled;
Tom 'spot' Callawaya271c242005-04-24 20:38:02 -0700166 /* Make sure the user can actually press Stop-A (L1-A) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 stop_a_enabled = 1;
Fabian Frederickd7c08472014-04-07 15:39:03 -0700168 pr_emerg("Press Stop-A (L1-A) to return to the boot prom\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 }
170#endif
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800171#if defined(CONFIG_S390)
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100172 {
173 unsigned long caller;
174
175 caller = (unsigned long)__builtin_return_address(0);
176 disabled_wait(caller);
177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178#endif
Fabian Frederickd7c08472014-04-07 15:39:03 -0700179 pr_emerg("---[ end Kernel panic - not syncing: %s\n", buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 local_irq_enable();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700181 for (i = 0; ; i += PANIC_TIMER_STEP) {
Jan Beulichc22db942006-02-10 01:51:11 -0800182 touch_softlockup_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700183 if (i >= i_next) {
184 i += panic_blink(state ^= 1);
185 i_next = i + 3600 / PANIC_BLINK_SPD;
186 }
187 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189}
190
191EXPORT_SYMBOL(panic);
192
Daniel Walkerc277e632007-10-18 03:06:08 -0700193
Andi Kleen25ddbb12008-10-15 22:01:41 -0700194struct tnt {
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100195 u8 bit;
196 char true;
197 char false;
Andi Kleen25ddbb12008-10-15 22:01:41 -0700198};
199
200static const struct tnt tnts[] = {
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100201 { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
202 { TAINT_FORCED_MODULE, 'F', ' ' },
Dave Jones8c904872014-02-26 10:49:49 -0500203 { TAINT_CPU_OUT_OF_SPEC, 'S', ' ' },
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100204 { TAINT_FORCED_RMMOD, 'R', ' ' },
205 { TAINT_MACHINE_CHECK, 'M', ' ' },
206 { TAINT_BAD_PAGE, 'B', ' ' },
207 { TAINT_USER, 'U', ' ' },
208 { TAINT_DIE, 'D', ' ' },
209 { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
210 { TAINT_WARN, 'W', ' ' },
211 { TAINT_CRAP, 'C', ' ' },
Ben Hutchings92946bc2010-04-03 19:36:42 +0100212 { TAINT_FIRMWARE_WORKAROUND, 'I', ' ' },
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200213 { TAINT_OOT_MODULE, 'O', ' ' },
Rusty Russell57673c22014-03-31 14:39:57 +1030214 { TAINT_UNSIGNED_MODULE, 'E', ' ' },
Andi Kleen25ddbb12008-10-15 22:01:41 -0700215};
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217/**
218 * print_tainted - return a string to represent the kernel taint state.
219 *
220 * 'P' - Proprietary module has been loaded.
221 * 'F' - Module has been forcibly loaded.
222 * 'S' - SMP with CPUs not designed for SMP.
223 * 'R' - User forced a module unload.
224 * 'M' - System experienced a machine check exception.
225 * 'B' - System has hit bad_page.
226 * 'U' - Userspace-defined naughtiness.
Arjan van de Vena8005992008-12-01 13:14:00 -0800227 * 'D' - Kernel has oopsed before
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 * 'A' - ACPI table overridden.
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800229 * 'W' - Taint on warning.
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -0700230 * 'C' - modules from drivers/staging are loaded.
Ben Hutchings92946bc2010-04-03 19:36:42 +0100231 * 'I' - Working around severe firmware bug.
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200232 * 'O' - Out-of-tree module has been loaded.
Rusty Russell57673c22014-03-31 14:39:57 +1030233 * 'E' - Unsigned module has been loaded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 *
Robert P. J. Dayfe002a42009-06-28 21:10:07 -0400235 * The string is overwritten by the next call to print_tainted().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237const char *print_tainted(void)
238{
Chen Gang01284762013-11-12 15:11:32 -0800239 static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ")];
Andi Kleen25ddbb12008-10-15 22:01:41 -0700240
241 if (tainted_mask) {
242 char *s;
243 int i;
244
245 s = buf + sprintf(buf, "Tainted: ");
246 for (i = 0; i < ARRAY_SIZE(tnts); i++) {
247 const struct tnt *t = &tnts[i];
248 *s++ = test_bit(t->bit, &tainted_mask) ?
249 t->true : t->false;
250 }
251 *s = 0;
252 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 snprintf(buf, sizeof(buf), "Not tainted");
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100254
255 return buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256}
257
Andi Kleen25ddbb12008-10-15 22:01:41 -0700258int test_taint(unsigned flag)
259{
260 return test_bit(flag, &tainted_mask);
261}
262EXPORT_SYMBOL(test_taint);
263
264unsigned long get_taint(void)
265{
266 return tainted_mask;
267}
268
Rusty Russell373d4d02013-01-21 17:17:39 +1030269/**
270 * add_taint: add a taint flag if not already set.
271 * @flag: one of the TAINT_* constants.
272 * @lockdep_ok: whether lock debugging is still OK.
273 *
274 * If something bad has gone wrong, you'll want @lockdebug_ok = false, but for
275 * some notewortht-but-not-corrupting cases, it can be set to true.
276 */
277void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Rusty Russell373d4d02013-01-21 17:17:39 +1030279 if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off())
Fabian Frederickd7c08472014-04-07 15:39:03 -0700280 pr_warn("Disabling lock debugging due to kernel taint\n");
Frederic Weisbecker9eeba612009-04-11 03:17:17 +0200281
Andi Kleen25ddbb12008-10-15 22:01:41 -0700282 set_bit(flag, &tainted_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284EXPORT_SYMBOL(add_taint);
Andrew Mortondd287792006-03-23 03:00:57 -0800285
Andrew Mortondd287792006-03-23 03:00:57 -0800286static void spin_msec(int msecs)
287{
288 int i;
289
290 for (i = 0; i < msecs; i++) {
291 touch_nmi_watchdog();
292 mdelay(1);
293 }
294}
295
296/*
297 * It just happens that oops_enter() and oops_exit() are identically
298 * implemented...
299 */
300static void do_oops_enter_exit(void)
301{
302 unsigned long flags;
303 static int spin_counter;
304
305 if (!pause_on_oops)
306 return;
307
308 spin_lock_irqsave(&pause_on_oops_lock, flags);
309 if (pause_on_oops_flag == 0) {
310 /* This CPU may now print the oops message */
311 pause_on_oops_flag = 1;
312 } else {
313 /* We need to stall this CPU */
314 if (!spin_counter) {
315 /* This CPU gets to do the counting */
316 spin_counter = pause_on_oops;
317 do {
318 spin_unlock(&pause_on_oops_lock);
319 spin_msec(MSEC_PER_SEC);
320 spin_lock(&pause_on_oops_lock);
321 } while (--spin_counter);
322 pause_on_oops_flag = 0;
323 } else {
324 /* This CPU waits for a different one */
325 while (spin_counter) {
326 spin_unlock(&pause_on_oops_lock);
327 spin_msec(1);
328 spin_lock(&pause_on_oops_lock);
329 }
330 }
331 }
332 spin_unlock_irqrestore(&pause_on_oops_lock, flags);
333}
334
335/*
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100336 * Return true if the calling CPU is allowed to print oops-related info.
337 * This is a bit racy..
Andrew Mortondd287792006-03-23 03:00:57 -0800338 */
339int oops_may_print(void)
340{
341 return pause_on_oops_flag == 0;
342}
343
344/*
345 * Called when the architecture enters its oops handler, before it prints
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100346 * anything. If this is the first CPU to oops, and it's oopsing the first
347 * time then let it proceed.
Andrew Mortondd287792006-03-23 03:00:57 -0800348 *
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100349 * This is all enabled by the pause_on_oops kernel boot option. We do all
350 * this to ensure that oopses don't scroll off the screen. It has the
351 * side-effect of preventing later-oopsing CPUs from mucking up the display,
352 * too.
Andrew Mortondd287792006-03-23 03:00:57 -0800353 *
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100354 * It turns out that the CPU which is allowed to print ends up pausing for
355 * the right duration, whereas all the other CPUs pause for twice as long:
356 * once in oops_enter(), once in oops_exit().
Andrew Mortondd287792006-03-23 03:00:57 -0800357 */
358void oops_enter(void)
359{
Thomas Gleixnerbdff7872009-07-24 15:30:45 -0400360 tracing_off();
Ingo Molnarc95dbf272009-03-13 11:14:06 +0100361 /* can't trust the integrity of the kernel anymore: */
362 debug_locks_off();
Andrew Mortondd287792006-03-23 03:00:57 -0800363 do_oops_enter_exit();
364}
365
366/*
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100367 * 64-bit random ID for oopses:
368 */
369static u64 oops_id;
370
371static int init_oops_id(void)
372{
373 if (!oops_id)
374 get_random_bytes(&oops_id, sizeof(oops_id));
Arjan van de Vend6624f92009-01-06 14:40:54 -0800375 else
376 oops_id++;
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100377
378 return 0;
379}
380late_initcall(init_oops_id);
381
Anton Blanchard863a6042010-08-10 18:03:30 -0700382void print_oops_end_marker(void)
Arjan van de Ven71c33912008-01-30 13:32:50 +0100383{
384 init_oops_id();
Fabian Frederickd7c08472014-04-07 15:39:03 -0700385 pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
Arjan van de Ven71c33912008-01-30 13:32:50 +0100386}
387
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100388/*
Andrew Mortondd287792006-03-23 03:00:57 -0800389 * Called when the architecture exits its oops handler, after printing
390 * everything.
391 */
392void oops_exit(void)
393{
394 do_oops_enter_exit();
Arjan van de Ven71c33912008-01-30 13:32:50 +0100395 print_oops_end_marker();
Simon Kagstrom456b5652009-10-16 14:09:18 +0200396 kmsg_dump(KMSG_DUMP_OOPS);
Andrew Mortondd287792006-03-23 03:00:57 -0800397}
Arjan van de Ven3162f752006-09-26 10:52:39 +0200398
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100399#ifdef WANT_WARN_ON_SLOWPATH
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700400struct slowpath_args {
401 const char *fmt;
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700402 va_list args;
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700403};
404
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100405static void warn_slowpath_common(const char *file, int line, void *caller,
406 unsigned taint, struct slowpath_args *args)
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700407{
Steven Rostedt (Red Hat)de7edd32013-06-14 16:21:43 -0400408 disable_trace_on_warning();
409
Alex Thorltondcb6b452013-07-08 16:00:42 -0700410 pr_warn("------------[ cut here ]------------\n");
411 pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS()\n",
412 raw_smp_processor_id(), current->pid, file, line, caller);
Arjan van de Ven74853db2008-11-28 08:35:25 -0800413
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700414 if (args)
415 vprintk(args->fmt, args->args);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700416
417 print_modules();
418 dump_stack();
419 print_oops_end_marker();
Rusty Russell373d4d02013-01-21 17:17:39 +1030420 /* Just a warning, don't kill lockdep. */
421 add_taint(taint, LOCKDEP_STILL_OK);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700422}
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700423
424void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
425{
426 struct slowpath_args args;
427
428 args.fmt = fmt;
429 va_start(args.args, fmt);
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100430 warn_slowpath_common(file, line, __builtin_return_address(0),
431 TAINT_WARN, &args);
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700432 va_end(args.args);
433}
Andi Kleen57adc4d2009-05-06 16:02:53 -0700434EXPORT_SYMBOL(warn_slowpath_fmt);
435
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100436void warn_slowpath_fmt_taint(const char *file, int line,
437 unsigned taint, const char *fmt, ...)
438{
439 struct slowpath_args args;
440
441 args.fmt = fmt;
442 va_start(args.args, fmt);
443 warn_slowpath_common(file, line, __builtin_return_address(0),
444 taint, &args);
445 va_end(args.args);
446}
447EXPORT_SYMBOL(warn_slowpath_fmt_taint);
448
Andi Kleen57adc4d2009-05-06 16:02:53 -0700449void warn_slowpath_null(const char *file, int line)
450{
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100451 warn_slowpath_common(file, line, __builtin_return_address(0),
452 TAINT_WARN, NULL);
Andi Kleen57adc4d2009-05-06 16:02:53 -0700453}
454EXPORT_SYMBOL(warn_slowpath_null);
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100455#endif
456
Arjan van de Ven3162f752006-09-26 10:52:39 +0200457#ifdef CONFIG_CC_STACKPROTECTOR
Arjan van de Ven54371a42008-02-15 15:33:12 -0800458
Arjan van de Ven3162f752006-09-26 10:52:39 +0200459/*
460 * Called when gcc's -fstack-protector feature is used, and
461 * gcc detects corruption of the on-stack canary value
462 */
Andi Kleena7330c92014-02-08 08:52:06 +0100463__visible void __stack_chk_fail(void)
Arjan van de Ven3162f752006-09-26 10:52:39 +0200464{
Ingo Molnar517a92c2008-02-14 09:02:13 +0100465 panic("stack-protector: Kernel stack is corrupted in: %p\n",
466 __builtin_return_address(0));
Arjan van de Ven3162f752006-09-26 10:52:39 +0200467}
468EXPORT_SYMBOL(__stack_chk_fail);
Arjan van de Ven54371a42008-02-15 15:33:12 -0800469
Arjan van de Ven3162f752006-09-26 10:52:39 +0200470#endif
Rusty Russellf44dd162008-10-22 10:00:24 -0500471
472core_param(panic, panic_timeout, int, 0644);
473core_param(pause_on_oops, pause_on_oops, int, 0644);
Olaf Heringd404ab02011-03-22 16:34:04 -0700474
475static int __init oops_setup(char *s)
476{
477 if (!s)
478 return -EINVAL;
479 if (!strcmp(s, "panic"))
480 panic_on_oops = 1;
481 return 0;
482}
483early_param("oops", oops_setup);