mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Add SPDX license identifiers to all files which: - Have no license information of any form - Have EXPORT_.*_SYMBOL_GPL inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
704 lines
18 KiB
C
704 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/kernel/panic.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
/*
|
|
* This function is used through-out the kernel (including mm and fs)
|
|
* to indicate a major problem.
|
|
*/
|
|
#include <linux/debug_locks.h>
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kmsg_dump.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/vt_kern.h>
|
|
#include <linux/module.h>
|
|
#include <linux/random.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/sysrq.h>
|
|
#include <linux/init.h>
|
|
#include <linux/nmi.h>
|
|
#include <linux/console.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/ratelimit.h>
|
|
#include <linux/debugfs.h>
|
|
#include <asm/sections.h>
|
|
|
|
#define PANIC_TIMER_STEP 100
|
|
#define PANIC_BLINK_SPD 18
|
|
|
|
int panic_on_oops = CONFIG_PANIC_ON_OOPS_VALUE;
|
|
static unsigned long tainted_mask =
|
|
IS_ENABLED(CONFIG_GCC_PLUGIN_RANDSTRUCT) ? (1 << TAINT_RANDSTRUCT) : 0;
|
|
static int pause_on_oops;
|
|
static int pause_on_oops_flag;
|
|
static DEFINE_SPINLOCK(pause_on_oops_lock);
|
|
bool crash_kexec_post_notifiers;
|
|
int panic_on_warn __read_mostly;
|
|
|
|
int panic_timeout = CONFIG_PANIC_TIMEOUT;
|
|
EXPORT_SYMBOL_GPL(panic_timeout);
|
|
|
|
#define PANIC_PRINT_TASK_INFO 0x00000001
|
|
#define PANIC_PRINT_MEM_INFO 0x00000002
|
|
#define PANIC_PRINT_TIMER_INFO 0x00000004
|
|
#define PANIC_PRINT_LOCK_INFO 0x00000008
|
|
#define PANIC_PRINT_FTRACE_INFO 0x00000010
|
|
#define PANIC_PRINT_ALL_PRINTK_MSG 0x00000020
|
|
unsigned long panic_print;
|
|
|
|
ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
|
|
|
|
EXPORT_SYMBOL(panic_notifier_list);
|
|
|
|
static long no_blink(int state)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* Returns how long it waited in ms */
|
|
long (*panic_blink)(int state);
|
|
EXPORT_SYMBOL(panic_blink);
|
|
|
|
/*
|
|
* Stop ourself in panic -- architecture code may override this
|
|
*/
|
|
void __weak panic_smp_self_stop(void)
|
|
{
|
|
while (1)
|
|
cpu_relax();
|
|
}
|
|
|
|
/*
|
|
* Stop ourselves in NMI context if another CPU has already panicked. Arch code
|
|
* may override this to prepare for crash dumping, e.g. save regs info.
|
|
*/
|
|
void __weak nmi_panic_self_stop(struct pt_regs *regs)
|
|
{
|
|
panic_smp_self_stop();
|
|
}
|
|
|
|
/*
|
|
* Stop other CPUs in panic. Architecture dependent code may override this
|
|
* with more suitable version. For example, if the architecture supports
|
|
* crash dump, it should save registers of each stopped CPU and disable
|
|
* per-CPU features such as virtualization extensions.
|
|
*/
|
|
void __weak crash_smp_send_stop(void)
|
|
{
|
|
static int cpus_stopped;
|
|
|
|
/*
|
|
* This function can be called twice in panic path, but obviously
|
|
* we execute this only once.
|
|
*/
|
|
if (cpus_stopped)
|
|
return;
|
|
|
|
/*
|
|
* Note smp_send_stop is the usual smp shutdown function, which
|
|
* unfortunately means it may not be hardened to work in a panic
|
|
* situation.
|
|
*/
|
|
smp_send_stop();
|
|
cpus_stopped = 1;
|
|
}
|
|
|
|
atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID);
|
|
|
|
/*
|
|
* A variant of panic() called from NMI context. We return if we've already
|
|
* panicked on this CPU. If another CPU already panicked, loop in
|
|
* nmi_panic_self_stop() which can provide architecture dependent code such
|
|
* as saving register state for crash dump.
|
|
*/
|
|
void nmi_panic(struct pt_regs *regs, const char *msg)
|
|
{
|
|
int old_cpu, cpu;
|
|
|
|
cpu = raw_smp_processor_id();
|
|
old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu);
|
|
|
|
if (old_cpu == PANIC_CPU_INVALID)
|
|
panic("%s", msg);
|
|
else if (old_cpu != cpu)
|
|
nmi_panic_self_stop(regs);
|
|
}
|
|
EXPORT_SYMBOL(nmi_panic);
|
|
|
|
static void panic_print_sys_info(void)
|
|
{
|
|
if (panic_print & PANIC_PRINT_ALL_PRINTK_MSG)
|
|
console_flush_on_panic(CONSOLE_REPLAY_ALL);
|
|
|
|
if (panic_print & PANIC_PRINT_TASK_INFO)
|
|
show_state();
|
|
|
|
if (panic_print & PANIC_PRINT_MEM_INFO)
|
|
show_mem(0, NULL);
|
|
|
|
if (panic_print & PANIC_PRINT_TIMER_INFO)
|
|
sysrq_timer_list_show();
|
|
|
|
if (panic_print & PANIC_PRINT_LOCK_INFO)
|
|
debug_show_all_locks();
|
|
|
|
if (panic_print & PANIC_PRINT_FTRACE_INFO)
|
|
ftrace_dump(DUMP_ALL);
|
|
}
|
|
|
|
/**
|
|
* panic - halt the system
|
|
* @fmt: The text string to print
|
|
*
|
|
* Display a message, then perform cleanups.
|
|
*
|
|
* This function never returns.
|
|
*/
|
|
void panic(const char *fmt, ...)
|
|
{
|
|
static char buf[1024];
|
|
va_list args;
|
|
long i, i_next = 0, len;
|
|
int state = 0;
|
|
int old_cpu, this_cpu;
|
|
bool _crash_kexec_post_notifiers = crash_kexec_post_notifiers;
|
|
|
|
/*
|
|
* Disable local interrupts. This will prevent panic_smp_self_stop
|
|
* from deadlocking the first cpu that invokes the panic, since
|
|
* there is nothing to prevent an interrupt handler (that runs
|
|
* after setting panic_cpu) from invoking panic() again.
|
|
*/
|
|
local_irq_disable();
|
|
|
|
/*
|
|
* It's possible to come here directly from a panic-assertion and
|
|
* not have preempt disabled. Some functions called from here want
|
|
* preempt to be disabled. No point enabling it later though...
|
|
*
|
|
* Only one CPU is allowed to execute the panic code from here. For
|
|
* multiple parallel invocations of panic, all other CPUs either
|
|
* stop themself or will wait until they are stopped by the 1st CPU
|
|
* with smp_send_stop().
|
|
*
|
|
* `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which
|
|
* comes here, so go ahead.
|
|
* `old_cpu == this_cpu' means we came from nmi_panic() which sets
|
|
* panic_cpu to this CPU. In this case, this is also the 1st CPU.
|
|
*/
|
|
this_cpu = raw_smp_processor_id();
|
|
old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu);
|
|
|
|
if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu)
|
|
panic_smp_self_stop();
|
|
|
|
console_verbose();
|
|
bust_spinlocks(1);
|
|
va_start(args, fmt);
|
|
len = vscnprintf(buf, sizeof(buf), fmt, args);
|
|
va_end(args);
|
|
|
|
if (len && buf[len - 1] == '\n')
|
|
buf[len - 1] = '\0';
|
|
|
|
pr_emerg("Kernel panic - not syncing: %s\n", buf);
|
|
#ifdef CONFIG_DEBUG_BUGVERBOSE
|
|
/*
|
|
* Avoid nested stack-dumping if a panic occurs during oops processing
|
|
*/
|
|
if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
|
|
dump_stack();
|
|
#endif
|
|
|
|
/*
|
|
* If we have crashed and we have a crash kernel loaded let it handle
|
|
* everything else.
|
|
* If we want to run this after calling panic_notifiers, pass
|
|
* the "crash_kexec_post_notifiers" option to the kernel.
|
|
*
|
|
* Bypass the panic_cpu check and call __crash_kexec directly.
|
|
*/
|
|
if (!_crash_kexec_post_notifiers) {
|
|
printk_safe_flush_on_panic();
|
|
__crash_kexec(NULL);
|
|
|
|
/*
|
|
* Note smp_send_stop is the usual smp shutdown function, which
|
|
* unfortunately means it may not be hardened to work in a
|
|
* panic situation.
|
|
*/
|
|
smp_send_stop();
|
|
} else {
|
|
/*
|
|
* If we want to do crash dump after notifier calls and
|
|
* kmsg_dump, we will need architecture dependent extra
|
|
* works in addition to stopping other CPUs.
|
|
*/
|
|
crash_smp_send_stop();
|
|
}
|
|
|
|
/*
|
|
* Run any panic handlers, including those that might need to
|
|
* add information to the kmsg dump output.
|
|
*/
|
|
atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
|
|
|
|
/* Call flush even twice. It tries harder with a single online CPU */
|
|
printk_safe_flush_on_panic();
|
|
kmsg_dump(KMSG_DUMP_PANIC);
|
|
|
|
/*
|
|
* If you doubt kdump always works fine in any situation,
|
|
* "crash_kexec_post_notifiers" offers you a chance to run
|
|
* panic_notifiers and dumping kmsg before kdump.
|
|
* Note: since some panic_notifiers can make crashed kernel
|
|
* more unstable, it can increase risks of the kdump failure too.
|
|
*
|
|
* Bypass the panic_cpu check and call __crash_kexec directly.
|
|
*/
|
|
if (_crash_kexec_post_notifiers)
|
|
__crash_kexec(NULL);
|
|
|
|
#ifdef CONFIG_VT
|
|
unblank_screen();
|
|
#endif
|
|
console_unblank();
|
|
|
|
/*
|
|
* We may have ended up stopping the CPU holding the lock (in
|
|
* smp_send_stop()) while still having some valuable data in the console
|
|
* buffer. Try to acquire the lock then release it regardless of the
|
|
* result. The release will also print the buffers out. Locks debug
|
|
* should be disabled to avoid reporting bad unlock balance when
|
|
* panic() is not being callled from OOPS.
|
|
*/
|
|
debug_locks_off();
|
|
console_flush_on_panic(CONSOLE_FLUSH_PENDING);
|
|
|
|
panic_print_sys_info();
|
|
|
|
if (!panic_blink)
|
|
panic_blink = no_blink;
|
|
|
|
if (panic_timeout > 0) {
|
|
/*
|
|
* Delay timeout seconds before rebooting the machine.
|
|
* We can't use the "normal" timers since we just panicked.
|
|
*/
|
|
pr_emerg("Rebooting in %d seconds..\n", panic_timeout);
|
|
|
|
for (i = 0; i < panic_timeout * 1000; i += PANIC_TIMER_STEP) {
|
|
touch_nmi_watchdog();
|
|
if (i >= i_next) {
|
|
i += panic_blink(state ^= 1);
|
|
i_next = i + 3600 / PANIC_BLINK_SPD;
|
|
}
|
|
mdelay(PANIC_TIMER_STEP);
|
|
}
|
|
}
|
|
if (panic_timeout != 0) {
|
|
/*
|
|
* This will not be a clean reboot, with everything
|
|
* shutting down. But if there is a chance of
|
|
* rebooting the system it will be rebooted.
|
|
*/
|
|
if (panic_reboot_mode != REBOOT_UNDEFINED)
|
|
reboot_mode = panic_reboot_mode;
|
|
emergency_restart();
|
|
}
|
|
#ifdef __sparc__
|
|
{
|
|
extern int stop_a_enabled;
|
|
/* Make sure the user can actually press Stop-A (L1-A) */
|
|
stop_a_enabled = 1;
|
|
pr_emerg("Press Stop-A (L1-A) from sun keyboard or send break\n"
|
|
"twice on console to return to the boot prom\n");
|
|
}
|
|
#endif
|
|
#if defined(CONFIG_S390)
|
|
disabled_wait();
|
|
#endif
|
|
pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);
|
|
|
|
/* Do not scroll important messages printed above */
|
|
suppress_printk = 1;
|
|
local_irq_enable();
|
|
for (i = 0; ; i += PANIC_TIMER_STEP) {
|
|
touch_softlockup_watchdog();
|
|
if (i >= i_next) {
|
|
i += panic_blink(state ^= 1);
|
|
i_next = i + 3600 / PANIC_BLINK_SPD;
|
|
}
|
|
mdelay(PANIC_TIMER_STEP);
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(panic);
|
|
|
|
/*
|
|
* TAINT_FORCED_RMMOD could be a per-module flag but the module
|
|
* is being removed anyway.
|
|
*/
|
|
const struct taint_flag taint_flags[TAINT_FLAGS_COUNT] = {
|
|
[ TAINT_PROPRIETARY_MODULE ] = { 'P', 'G', true },
|
|
[ TAINT_FORCED_MODULE ] = { 'F', ' ', true },
|
|
[ TAINT_CPU_OUT_OF_SPEC ] = { 'S', ' ', false },
|
|
[ TAINT_FORCED_RMMOD ] = { 'R', ' ', false },
|
|
[ TAINT_MACHINE_CHECK ] = { 'M', ' ', false },
|
|
[ TAINT_BAD_PAGE ] = { 'B', ' ', false },
|
|
[ TAINT_USER ] = { 'U', ' ', false },
|
|
[ TAINT_DIE ] = { 'D', ' ', false },
|
|
[ TAINT_OVERRIDDEN_ACPI_TABLE ] = { 'A', ' ', false },
|
|
[ TAINT_WARN ] = { 'W', ' ', false },
|
|
[ TAINT_CRAP ] = { 'C', ' ', true },
|
|
[ TAINT_FIRMWARE_WORKAROUND ] = { 'I', ' ', false },
|
|
[ TAINT_OOT_MODULE ] = { 'O', ' ', true },
|
|
[ TAINT_UNSIGNED_MODULE ] = { 'E', ' ', true },
|
|
[ TAINT_SOFTLOCKUP ] = { 'L', ' ', false },
|
|
[ TAINT_LIVEPATCH ] = { 'K', ' ', true },
|
|
[ TAINT_AUX ] = { 'X', ' ', true },
|
|
[ TAINT_RANDSTRUCT ] = { 'T', ' ', true },
|
|
};
|
|
|
|
/**
|
|
* print_tainted - return a string to represent the kernel taint state.
|
|
*
|
|
* For individual taint flag meanings, see Documentation/sysctl/kernel.txt
|
|
*
|
|
* The string is overwritten by the next call to print_tainted(),
|
|
* but is always NULL terminated.
|
|
*/
|
|
const char *print_tainted(void)
|
|
{
|
|
static char buf[TAINT_FLAGS_COUNT + sizeof("Tainted: ")];
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(taint_flags) != TAINT_FLAGS_COUNT);
|
|
|
|
if (tainted_mask) {
|
|
char *s;
|
|
int i;
|
|
|
|
s = buf + sprintf(buf, "Tainted: ");
|
|
for (i = 0; i < TAINT_FLAGS_COUNT; i++) {
|
|
const struct taint_flag *t = &taint_flags[i];
|
|
*s++ = test_bit(i, &tainted_mask) ?
|
|
t->c_true : t->c_false;
|
|
}
|
|
*s = 0;
|
|
} else
|
|
snprintf(buf, sizeof(buf), "Not tainted");
|
|
|
|
return buf;
|
|
}
|
|
|
|
int test_taint(unsigned flag)
|
|
{
|
|
return test_bit(flag, &tainted_mask);
|
|
}
|
|
EXPORT_SYMBOL(test_taint);
|
|
|
|
unsigned long get_taint(void)
|
|
{
|
|
return tainted_mask;
|
|
}
|
|
|
|
/**
|
|
* add_taint: add a taint flag if not already set.
|
|
* @flag: one of the TAINT_* constants.
|
|
* @lockdep_ok: whether lock debugging is still OK.
|
|
*
|
|
* If something bad has gone wrong, you'll want @lockdebug_ok = false, but for
|
|
* some notewortht-but-not-corrupting cases, it can be set to true.
|
|
*/
|
|
void add_taint(unsigned flag, enum lockdep_ok lockdep_ok)
|
|
{
|
|
if (lockdep_ok == LOCKDEP_NOW_UNRELIABLE && __debug_locks_off())
|
|
pr_warn("Disabling lock debugging due to kernel taint\n");
|
|
|
|
set_bit(flag, &tainted_mask);
|
|
}
|
|
EXPORT_SYMBOL(add_taint);
|
|
|
|
static void spin_msec(int msecs)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < msecs; i++) {
|
|
touch_nmi_watchdog();
|
|
mdelay(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* It just happens that oops_enter() and oops_exit() are identically
|
|
* implemented...
|
|
*/
|
|
static void do_oops_enter_exit(void)
|
|
{
|
|
unsigned long flags;
|
|
static int spin_counter;
|
|
|
|
if (!pause_on_oops)
|
|
return;
|
|
|
|
spin_lock_irqsave(&pause_on_oops_lock, flags);
|
|
if (pause_on_oops_flag == 0) {
|
|
/* This CPU may now print the oops message */
|
|
pause_on_oops_flag = 1;
|
|
} else {
|
|
/* We need to stall this CPU */
|
|
if (!spin_counter) {
|
|
/* This CPU gets to do the counting */
|
|
spin_counter = pause_on_oops;
|
|
do {
|
|
spin_unlock(&pause_on_oops_lock);
|
|
spin_msec(MSEC_PER_SEC);
|
|
spin_lock(&pause_on_oops_lock);
|
|
} while (--spin_counter);
|
|
pause_on_oops_flag = 0;
|
|
} else {
|
|
/* This CPU waits for a different one */
|
|
while (spin_counter) {
|
|
spin_unlock(&pause_on_oops_lock);
|
|
spin_msec(1);
|
|
spin_lock(&pause_on_oops_lock);
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&pause_on_oops_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Return true if the calling CPU is allowed to print oops-related info.
|
|
* This is a bit racy..
|
|
*/
|
|
int oops_may_print(void)
|
|
{
|
|
return pause_on_oops_flag == 0;
|
|
}
|
|
|
|
/*
|
|
* Called when the architecture enters its oops handler, before it prints
|
|
* anything. If this is the first CPU to oops, and it's oopsing the first
|
|
* time then let it proceed.
|
|
*
|
|
* This is all enabled by the pause_on_oops kernel boot option. We do all
|
|
* this to ensure that oopses don't scroll off the screen. It has the
|
|
* side-effect of preventing later-oopsing CPUs from mucking up the display,
|
|
* too.
|
|
*
|
|
* It turns out that the CPU which is allowed to print ends up pausing for
|
|
* the right duration, whereas all the other CPUs pause for twice as long:
|
|
* once in oops_enter(), once in oops_exit().
|
|
*/
|
|
void oops_enter(void)
|
|
{
|
|
tracing_off();
|
|
/* can't trust the integrity of the kernel anymore: */
|
|
debug_locks_off();
|
|
do_oops_enter_exit();
|
|
}
|
|
|
|
/*
|
|
* 64-bit random ID for oopses:
|
|
*/
|
|
static u64 oops_id;
|
|
|
|
static int init_oops_id(void)
|
|
{
|
|
if (!oops_id)
|
|
get_random_bytes(&oops_id, sizeof(oops_id));
|
|
else
|
|
oops_id++;
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(init_oops_id);
|
|
|
|
void print_oops_end_marker(void)
|
|
{
|
|
init_oops_id();
|
|
pr_warn("---[ end trace %016llx ]---\n", (unsigned long long)oops_id);
|
|
}
|
|
|
|
/*
|
|
* Called when the architecture exits its oops handler, after printing
|
|
* everything.
|
|
*/
|
|
void oops_exit(void)
|
|
{
|
|
do_oops_enter_exit();
|
|
print_oops_end_marker();
|
|
kmsg_dump(KMSG_DUMP_OOPS);
|
|
}
|
|
|
|
struct warn_args {
|
|
const char *fmt;
|
|
va_list args;
|
|
};
|
|
|
|
void __warn(const char *file, int line, void *caller, unsigned taint,
|
|
struct pt_regs *regs, struct warn_args *args)
|
|
{
|
|
disable_trace_on_warning();
|
|
|
|
if (args)
|
|
pr_warn(CUT_HERE);
|
|
|
|
if (file)
|
|
pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS\n",
|
|
raw_smp_processor_id(), current->pid, file, line,
|
|
caller);
|
|
else
|
|
pr_warn("WARNING: CPU: %d PID: %d at %pS\n",
|
|
raw_smp_processor_id(), current->pid, caller);
|
|
|
|
if (args)
|
|
vprintk(args->fmt, args->args);
|
|
|
|
if (panic_on_warn) {
|
|
/*
|
|
* This thread may hit another WARN() in the panic path.
|
|
* Resetting this prevents additional WARN() from panicking the
|
|
* system on this thread. Other threads are blocked by the
|
|
* panic_mutex in panic().
|
|
*/
|
|
panic_on_warn = 0;
|
|
panic("panic_on_warn set ...\n");
|
|
}
|
|
|
|
print_modules();
|
|
|
|
if (regs)
|
|
show_regs(regs);
|
|
else
|
|
dump_stack();
|
|
|
|
print_irqtrace_events(current);
|
|
|
|
print_oops_end_marker();
|
|
|
|
/* Just a warning, don't kill lockdep. */
|
|
add_taint(taint, LOCKDEP_STILL_OK);
|
|
}
|
|
|
|
#ifdef WANT_WARN_ON_SLOWPATH
|
|
void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
|
|
{
|
|
struct warn_args args;
|
|
|
|
args.fmt = fmt;
|
|
va_start(args.args, fmt);
|
|
__warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL,
|
|
&args);
|
|
va_end(args.args);
|
|
}
|
|
EXPORT_SYMBOL(warn_slowpath_fmt);
|
|
|
|
void warn_slowpath_fmt_taint(const char *file, int line,
|
|
unsigned taint, const char *fmt, ...)
|
|
{
|
|
struct warn_args args;
|
|
|
|
args.fmt = fmt;
|
|
va_start(args.args, fmt);
|
|
__warn(file, line, __builtin_return_address(0), taint, NULL, &args);
|
|
va_end(args.args);
|
|
}
|
|
EXPORT_SYMBOL(warn_slowpath_fmt_taint);
|
|
|
|
void warn_slowpath_null(const char *file, int line)
|
|
{
|
|
pr_warn(CUT_HERE);
|
|
__warn(file, line, __builtin_return_address(0), TAINT_WARN, NULL, NULL);
|
|
}
|
|
EXPORT_SYMBOL(warn_slowpath_null);
|
|
#else
|
|
void __warn_printk(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
pr_warn(CUT_HERE);
|
|
|
|
va_start(args, fmt);
|
|
vprintk(fmt, args);
|
|
va_end(args);
|
|
}
|
|
EXPORT_SYMBOL(__warn_printk);
|
|
#endif
|
|
|
|
#ifdef CONFIG_BUG
|
|
|
|
/* Support resetting WARN*_ONCE state */
|
|
|
|
static int clear_warn_once_set(void *data, u64 val)
|
|
{
|
|
generic_bug_clear_once();
|
|
memset(__start_once, 0, __end_once - __start_once);
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(clear_warn_once_fops, NULL, clear_warn_once_set,
|
|
"%lld\n");
|
|
|
|
static __init int register_warn_debugfs(void)
|
|
{
|
|
/* Don't care about failure */
|
|
debugfs_create_file_unsafe("clear_warn_once", 0200, NULL, NULL,
|
|
&clear_warn_once_fops);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(register_warn_debugfs);
|
|
#endif
|
|
|
|
#ifdef CONFIG_STACKPROTECTOR
|
|
|
|
/*
|
|
* Called when gcc's -fstack-protector feature is used, and
|
|
* gcc detects corruption of the on-stack canary value
|
|
*/
|
|
__visible void __stack_chk_fail(void)
|
|
{
|
|
panic("stack-protector: Kernel stack is corrupted in: %pB",
|
|
__builtin_return_address(0));
|
|
}
|
|
EXPORT_SYMBOL(__stack_chk_fail);
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_HAS_REFCOUNT
|
|
void refcount_error_report(struct pt_regs *regs, const char *err)
|
|
{
|
|
WARN_RATELIMIT(1, "refcount_t %s at %pB in %s[%d], uid/euid: %u/%u\n",
|
|
err, (void *)instruction_pointer(regs),
|
|
current->comm, task_pid_nr(current),
|
|
from_kuid_munged(&init_user_ns, current_uid()),
|
|
from_kuid_munged(&init_user_ns, current_euid()));
|
|
}
|
|
#endif
|
|
|
|
core_param(panic, panic_timeout, int, 0644);
|
|
core_param(panic_print, panic_print, ulong, 0644);
|
|
core_param(pause_on_oops, pause_on_oops, int, 0644);
|
|
core_param(panic_on_warn, panic_on_warn, int, 0644);
|
|
core_param(crash_kexec_post_notifiers, crash_kexec_post_notifiers, bool, 0644);
|
|
|
|
static int __init oops_setup(char *s)
|
|
{
|
|
if (!s)
|
|
return -EINVAL;
|
|
if (!strcmp(s, "panic"))
|
|
panic_on_oops = 1;
|
|
return 0;
|
|
}
|
|
early_param("oops", oops_setup);
|