blob: 97712319f1284152366e0cd5dda3cbae025bcbc7 [file] [log] [blame]
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 Molnarc95dbf22009-03-13 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 Molnarc95dbf22009-03-13 11:14:06 +010015#include <linux/notifier.h>
16#include <linux/module.h>
17#include <linux/random.h>
18#include <linux/reboot.h>
19#include <linux/delay.h>
20#include <linux/kexec.h>
21#include <linux/sched.h>
22#include <linux/sysrq.h>
23#include <linux/init.h>
24#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070026#define PANIC_TIMER_STEP 100
27#define PANIC_BLINK_SPD 18
28
Kyle McMartin2a01bb32012-04-11 08:15:29 -040029int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
Andi Kleen25ddbb12008-10-15 22:01:41 -070030static unsigned long tainted_mask;
Andrew Mortondd287792006-03-23 03:00:57 -080031static int pause_on_oops;
32static int pause_on_oops_flag;
33static DEFINE_SPINLOCK(pause_on_oops_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Andrew Mortondd287792006-03-23 03:00:57 -080035int panic_timeout;
Huang Ying81e88fd2011-01-12 14:44:55 +080036EXPORT_SYMBOL_GPL(panic_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Alan Sterne041c682006-03-27 01:16:30 -080038ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40EXPORT_SYMBOL(panic_notifier_list);
41
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070042static long no_blink(int state)
Anton Blanchard8aeee852010-03-05 13:42:55 -080043{
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070044 return 0;
Anton Blanchard8aeee852010-03-05 13:42:55 -080045}
46
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070047/* Returns how long it waited in ms */
48long (*panic_blink)(int state);
49EXPORT_SYMBOL(panic_blink);
50
Michael Holzheu93e13a32012-01-12 17:20:18 -080051/*
52 * Stop ourself in panic -- architecture code may override this
53 */
54void __weak panic_smp_self_stop(void)
55{
56 while (1)
57 cpu_relax();
58}
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060/**
61 * panic - halt the system
62 * @fmt: The text string to print
63 *
64 * Display a message, then perform cleanups.
65 *
66 * This function never returns.
67 */
Joe Perches9402c952012-01-12 17:17:17 -080068void panic(const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
Michael Holzheu93e13a32012-01-12 17:20:18 -080070 static DEFINE_SPINLOCK(panic_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 static char buf[1024];
72 va_list args;
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -070073 long i, i_next = 0;
74 int state = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Eric W. Biedermandc009d92005-06-25 14:57:52 -070076 /*
Vikram Mulukutla190320c2012-07-30 14:39:58 -070077 * Disable local interrupts. This will prevent panic_smp_self_stop
78 * from deadlocking the first cpu that invokes the panic, since
79 * there is nothing to prevent an interrupt handler (that runs
80 * after the panic_lock is acquired) from invoking panic again.
81 */
82 local_irq_disable();
83
84 /*
Ingo Molnarc95dbf22009-03-13 11:14:06 +010085 * It's possible to come here directly from a panic-assertion and
86 * not have preempt disabled. Some functions called from here want
Eric W. Biedermandc009d92005-06-25 14:57:52 -070087 * preempt to be disabled. No point enabling it later though...
Michael Holzheu93e13a32012-01-12 17:20:18 -080088 *
89 * Only one CPU is allowed to execute the panic code from here. For
90 * multiple parallel invocations of panic, all other CPUs either
91 * stop themself or will wait until they are stopped by the 1st CPU
92 * with smp_send_stop().
Eric W. Biedermandc009d92005-06-25 14:57:52 -070093 */
Michael Holzheu93e13a32012-01-12 17:20:18 -080094 if (!spin_trylock(&panic_lock))
95 panic_smp_self_stop();
Eric W. Biedermandc009d92005-06-25 14:57:52 -070096
Anton Blanchard5b530fc2010-05-26 14:44:24 -070097 console_verbose();
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 bust_spinlocks(1);
99 va_start(args, fmt);
100 vsnprintf(buf, sizeof(buf), fmt, args);
101 va_end(args);
102 printk(KERN_EMERG "Kernel panic - not syncing: %s\n",buf);
Ingo Molnar5cb27302008-02-14 09:07:01 +0100103#ifdef CONFIG_DEBUG_BUGVERBOSE
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800104 /*
105 * Avoid nested stack-dumping if a panic occurs during oops processing
106 */
Jason Wessel026ee1f2012-04-12 12:49:17 -0700107 if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
Andi Kleen6e6f0a12012-01-12 17:20:30 -0800108 dump_stack();
Ingo Molnar5cb27302008-02-14 09:07:01 +0100109#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700111 /*
112 * If we have crashed and we have a crash kernel loaded let it handle
113 * everything else.
114 * Do we want to call this before we try to display a message?
115 */
Alexander Nyberg6e274d12005-06-25 14:58:26 -0700116 crash_kexec(NULL);
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700117
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700118 /*
119 * Note smp_send_stop is the usual smp shutdown function, which
120 * unfortunately means it may not be hardened to work in a panic
121 * situation.
122 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 smp_send_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Seiji Aguchi62be73e2012-05-15 17:35:09 -0400125 kmsg_dump(KMSG_DUMP_PANIC);
126
Alan Sterne041c682006-03-27 01:16:30 -0800127 atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Aaro Koskinend014e882009-10-02 14:41:20 +0300129 bust_spinlocks(0);
130
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700131 if (!panic_blink)
132 panic_blink = no_blink;
133
Eric W. Biedermandc009d92005-06-25 14:57:52 -0700134 if (panic_timeout > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 /*
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100136 * Delay timeout seconds before rebooting the machine.
137 * We can't use the "normal" timers since we just panicked.
138 */
139 printk(KERN_EMERG "Rebooting in %d seconds..", panic_timeout);
140
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700141 for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 touch_nmi_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700143 if (i >= i_next) {
144 i += panic_blink(state ^= 1);
145 i_next = i + 3600 / PANIC_BLINK_SPD;
146 }
147 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
Hugh Dickins4302fbc2011-07-26 16:08:52 -0700149 }
150 if (panic_timeout != 0) {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100151 /*
152 * This will not be a clean reboot, with everything
153 * shutting down. But if there is a chance of
154 * rebooting the system it will be rebooted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 */
Eric W. Biederman2f048ea2005-07-26 11:49:23 -0600156 emergency_restart();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 }
158#ifdef __sparc__
159 {
160 extern int stop_a_enabled;
Tom 'spot' Callawaya271c242005-04-24 20:38:02 -0700161 /* Make sure the user can actually press Stop-A (L1-A) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 stop_a_enabled = 1;
Tom 'spot' Callawaya271c242005-04-24 20:38:02 -0700163 printk(KERN_EMERG "Press Stop-A (L1-A) to return to the boot prom\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165#endif
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800166#if defined(CONFIG_S390)
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100167 {
168 unsigned long caller;
169
170 caller = (unsigned long)__builtin_return_address(0);
171 disabled_wait(caller);
172 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173#endif
174 local_irq_enable();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700175 for (i = 0; ; i += PANIC_TIMER_STEP) {
Jan Beulichc22db942006-02-10 01:51:11 -0800176 touch_softlockup_watchdog();
TAMUKI Shoichic7ff0d92010-08-10 18:03:28 -0700177 if (i >= i_next) {
178 i += panic_blink(state ^= 1);
179 i_next = i + 3600 / PANIC_BLINK_SPD;
180 }
181 mdelay(PANIC_TIMER_STEP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 }
183}
184
185EXPORT_SYMBOL(panic);
186
Daniel Walkerc277e632007-10-18 03:06:08 -0700187
Andi Kleen25ddbb12008-10-15 22:01:41 -0700188struct tnt {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100189 u8 bit;
190 char true;
191 char false;
Andi Kleen25ddbb12008-10-15 22:01:41 -0700192};
193
194static const struct tnt tnts[] = {
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100195 { TAINT_PROPRIETARY_MODULE, 'P', 'G' },
196 { TAINT_FORCED_MODULE, 'F', ' ' },
197 { TAINT_UNSAFE_SMP, 'S', ' ' },
198 { TAINT_FORCED_RMMOD, 'R', ' ' },
199 { TAINT_MACHINE_CHECK, 'M', ' ' },
200 { TAINT_BAD_PAGE, 'B', ' ' },
201 { TAINT_USER, 'U', ' ' },
202 { TAINT_DIE, 'D', ' ' },
203 { TAINT_OVERRIDDEN_ACPI_TABLE, 'A', ' ' },
204 { TAINT_WARN, 'W', ' ' },
205 { TAINT_CRAP, 'C', ' ' },
Ben Hutchings92946bc2010-04-03 19:36:42 +0100206 { TAINT_FIRMWARE_WORKAROUND, 'I', ' ' },
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200207 { TAINT_OOT_MODULE, 'O', ' ' },
Andi Kleen25ddbb12008-10-15 22:01:41 -0700208};
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210/**
211 * print_tainted - return a string to represent the kernel taint state.
212 *
213 * 'P' - Proprietary module has been loaded.
214 * 'F' - Module has been forcibly loaded.
215 * 'S' - SMP with CPUs not designed for SMP.
216 * 'R' - User forced a module unload.
217 * 'M' - System experienced a machine check exception.
218 * 'B' - System has hit bad_page.
219 * 'U' - Userspace-defined naughtiness.
Arjan van de Vena8005992008-12-01 13:14:00 -0800220 * 'D' - Kernel has oopsed before
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 * 'A' - ACPI table overridden.
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800222 * 'W' - Taint on warning.
Greg Kroah-Hartman061b1bd2008-09-24 14:46:44 -0700223 * 'C' - modules from drivers/staging are loaded.
Ben Hutchings92946bc2010-04-03 19:36:42 +0100224 * 'I' - Working around severe firmware bug.
Ben Hutchings2449b8b2011-10-24 15:12:28 +0200225 * 'O' - Out-of-tree module has been loaded.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 *
Robert P. J. Dayfe002a42009-06-28 21:10:07 -0400227 * The string is overwritten by the next call to print_tainted().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229const char *print_tainted(void)
230{
Andi Kleen25ddbb12008-10-15 22:01:41 -0700231 static char buf[ARRAY_SIZE(tnts) + sizeof("Tainted: ") + 1];
232
233 if (tainted_mask) {
234 char *s;
235 int i;
236
237 s = buf + sprintf(buf, "Tainted: ");
238 for (i = 0; i < ARRAY_SIZE(tnts); i++) {
239 const struct tnt *t = &tnts[i];
240 *s++ = test_bit(t->bit, &tainted_mask) ?
241 t->true : t->false;
242 }
243 *s = 0;
244 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 snprintf(buf, sizeof(buf), "Not tainted");
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100246
247 return buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248}
249
Andi Kleen25ddbb12008-10-15 22:01:41 -0700250int test_taint(unsigned flag)
251{
252 return test_bit(flag, &tainted_mask);
253}
254EXPORT_SYMBOL(test_taint);
255
256unsigned long get_taint(void)
257{
258 return tainted_mask;
259}
260
Rusty Russell373d4d02013-01-21 17:17:39 +1030261/**
262 * add_taint: add a taint flag if not already set.
263 * @flag: one of the TAINT_* constants.
264 * @lockdep_ok: whether lock debugging is still OK.
265 *
266 * If something bad has gone wrong, you'll want @lockdebug_ok = false, but for
267 * some notewortht-but-not-corrupting cases, it can be set to true.
268 */
269void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
Rusty Russell373d4d02013-01-21 17:17:39 +1030271 if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off())
272 printk(KERN_WARNING
273 "Disabling lock debugging due to kernel taint\n");
Frederic Weisbecker9eeba612009-04-11 03:17:17 +0200274
Andi Kleen25ddbb12008-10-15 22:01:41 -0700275 set_bit(flag, &tainted_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276}
277EXPORT_SYMBOL(add_taint);
Andrew Mortondd287792006-03-23 03:00:57 -0800278
Andrew Mortondd287792006-03-23 03:00:57 -0800279static void spin_msec(int msecs)
280{
281 int i;
282
283 for (i = 0; i < msecs; i++) {
284 touch_nmi_watchdog();
285 mdelay(1);
286 }
287}
288
289/*
290 * It just happens that oops_enter() and oops_exit() are identically
291 * implemented...
292 */
293static void do_oops_enter_exit(void)
294{
295 unsigned long flags;
296 static int spin_counter;
297
298 if (!pause_on_oops)
299 return;
300
301 spin_lock_irqsave(&pause_on_oops_lock, flags);
302 if (pause_on_oops_flag == 0) {
303 /* This CPU may now print the oops message */
304 pause_on_oops_flag = 1;
305 } else {
306 /* We need to stall this CPU */
307 if (!spin_counter) {
308 /* This CPU gets to do the counting */
309 spin_counter = pause_on_oops;
310 do {
311 spin_unlock(&pause_on_oops_lock);
312 spin_msec(MSEC_PER_SEC);
313 spin_lock(&pause_on_oops_lock);
314 } while (--spin_counter);
315 pause_on_oops_flag = 0;
316 } else {
317 /* This CPU waits for a different one */
318 while (spin_counter) {
319 spin_unlock(&pause_on_oops_lock);
320 spin_msec(1);
321 spin_lock(&pause_on_oops_lock);
322 }
323 }
324 }
325 spin_unlock_irqrestore(&pause_on_oops_lock, flags);
326}
327
328/*
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100329 * Return true if the calling CPU is allowed to print oops-related info.
330 * This is a bit racy..
Andrew Mortondd287792006-03-23 03:00:57 -0800331 */
332int oops_may_print(void)
333{
334 return pause_on_oops_flag == 0;
335}
336
337/*
338 * Called when the architecture enters its oops handler, before it prints
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100339 * anything. If this is the first CPU to oops, and it's oopsing the first
340 * time then let it proceed.
Andrew Mortondd287792006-03-23 03:00:57 -0800341 *
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100342 * This is all enabled by the pause_on_oops kernel boot option. We do all
343 * this to ensure that oopses don't scroll off the screen. It has the
344 * side-effect of preventing later-oopsing CPUs from mucking up the display,
345 * too.
Andrew Mortondd287792006-03-23 03:00:57 -0800346 *
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100347 * It turns out that the CPU which is allowed to print ends up pausing for
348 * the right duration, whereas all the other CPUs pause for twice as long:
349 * once in oops_enter(), once in oops_exit().
Andrew Mortondd287792006-03-23 03:00:57 -0800350 */
351void oops_enter(void)
352{
Thomas Gleixnerbdff7872009-07-24 15:30:45 -0400353 tracing_off();
Ingo Molnarc95dbf22009-03-13 11:14:06 +0100354 /* can't trust the integrity of the kernel anymore: */
355 debug_locks_off();
Andrew Mortondd287792006-03-23 03:00:57 -0800356 do_oops_enter_exit();
357}
358
359/*
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100360 * 64-bit random ID for oopses:
361 */
362static u64 oops_id;
363
364static int init_oops_id(void)
365{
366 if (!oops_id)
367 get_random_bytes(&oops_id, sizeof(oops_id));
Arjan van de Vend6624f92009-01-06 14:40:54 -0800368 else
369 oops_id++;
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100370
371 return 0;
372}
373late_initcall(init_oops_id);
374
Anton Blanchard863a6042010-08-10 18:03:30 -0700375void print_oops_end_marker(void)
Arjan van de Ven71c33912008-01-30 13:32:50 +0100376{
377 init_oops_id();
378 printk(KERN_WARNING "---[ end trace %016llx ]---\n",
379 (unsigned long long)oops_id);
380}
381
Arjan van de Ven2c3b20e92007-12-20 15:01:17 +0100382/*
Andrew Mortondd287792006-03-23 03:00:57 -0800383 * Called when the architecture exits its oops handler, after printing
384 * everything.
385 */
386void oops_exit(void)
387{
388 do_oops_enter_exit();
Arjan van de Ven71c33912008-01-30 13:32:50 +0100389 print_oops_end_marker();
Simon Kagstrom456b5652009-10-16 14:09:18 +0200390 kmsg_dump(KMSG_DUMP_OOPS);
Andrew Mortondd287792006-03-23 03:00:57 -0800391}
Arjan van de Ven3162f752006-09-26 10:52:39 +0200392
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100393#ifdef WANT_WARN_ON_SLOWPATH
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700394struct slowpath_args {
395 const char *fmt;
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700396 va_list args;
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700397};
398
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100399static void warn_slowpath_common(const char *file, int line, void *caller,
400 unsigned taint, struct slowpath_args *args)
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700401{
Alex Thorltondcb6b452013-07-08 16:00:42 -0700402 pr_warn("------------[ cut here ]------------\n");
403 pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS()\n",
404 raw_smp_processor_id(), current->pid, file, line, caller);
Arjan van de Ven74853db2008-11-28 08:35:25 -0800405
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700406 if (args)
407 vprintk(args->fmt, args->args);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700408
409 print_modules();
410 dump_stack();
411 print_oops_end_marker();
Rusty Russell373d4d02013-01-21 17:17:39 +1030412 /* Just a warning, don't kill lockdep. */
413 add_taint(taint, LOCKDEP_STILL_OK);
Arjan van de Vena8f18b92008-07-25 01:45:53 -0700414}
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700415
416void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
417{
418 struct slowpath_args args;
419
420 args.fmt = fmt;
421 va_start(args.args, fmt);
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100422 warn_slowpath_common(file, line, __builtin_return_address(0),
423 TAINT_WARN, &args);
Linus Torvalds0f6f49a2009-05-16 13:41:28 -0700424 va_end(args.args);
425}
Andi Kleen57adc4d2009-05-06 16:02:53 -0700426EXPORT_SYMBOL(warn_slowpath_fmt);
427
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100428void warn_slowpath_fmt_taint(const char *file, int line,
429 unsigned taint, const char *fmt, ...)
430{
431 struct slowpath_args args;
432
433 args.fmt = fmt;
434 va_start(args.args, fmt);
435 warn_slowpath_common(file, line, __builtin_return_address(0),
436 taint, &args);
437 va_end(args.args);
438}
439EXPORT_SYMBOL(warn_slowpath_fmt_taint);
440
Andi Kleen57adc4d2009-05-06 16:02:53 -0700441void warn_slowpath_null(const char *file, int line)
442{
Ben Hutchingsb2be0522010-04-03 19:34:56 +0100443 warn_slowpath_common(file, line, __builtin_return_address(0),
444 TAINT_WARN, NULL);
Andi Kleen57adc4d2009-05-06 16:02:53 -0700445}
446EXPORT_SYMBOL(warn_slowpath_null);
Arjan van de Ven79b4cc52008-01-30 13:32:50 +0100447#endif
448
Arjan van de Ven3162f752006-09-26 10:52:39 +0200449#ifdef CONFIG_CC_STACKPROTECTOR
Arjan van de Ven54371a42008-02-15 15:33:12 -0800450
Arjan van de Ven3162f752006-09-26 10:52:39 +0200451/*
452 * Called when gcc's -fstack-protector feature is used, and
453 * gcc detects corruption of the on-stack canary value
454 */
455void __stack_chk_fail(void)
456{
Ingo Molnar517a92c2008-02-14 09:02:13 +0100457 panic("stack-protector: Kernel stack is corrupted in: %p\n",
458 __builtin_return_address(0));
Arjan van de Ven3162f752006-09-26 10:52:39 +0200459}
460EXPORT_SYMBOL(__stack_chk_fail);
Arjan van de Ven54371a42008-02-15 15:33:12 -0800461
Arjan van de Ven3162f752006-09-26 10:52:39 +0200462#endif
Rusty Russellf44dd162008-10-22 10:00:24 -0500463
464core_param(panic, panic_timeout, int, 0644);
465core_param(pause_on_oops, pause_on_oops, int, 0644);
Olaf Heringd404ab02011-03-22 16:34:04 -0700466
467static int __init oops_setup(char *s)
468{
469 if (!s)
470 return -EINVAL;
471 if (!strcmp(s, "panic"))
472 panic_on_oops = 1;
473 return 0;
474}
475early_param("oops", oops_setup);