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lkdtm/bugs: Add cases for BUG and PANIC occurring in hardirq context

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Add lkdtm cases to trigger a BUG() or panic() from hardirq context. This
is useful for testing pstore behavior being invoked from such contexts.

Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel
2025-12-06 20:01:16 +01:00
committed by Catalin Marinas
parent b7737c38e7
commit eb972eab07
2 changed files with 55 additions and 0 deletions
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53
drivers/misc/lkdtm/bugs.c
View File

@@ -8,6 +8,7 @@
#include "lkdtm.h"
#include <linux/cpu.h>
#include <linux/list.h>
#include <linux/hrtimer.h>
#include <linux/sched.h>
#include <linux/sched/signal.h>
#include <linux/sched/task_stack.h>
@@ -100,11 +101,61 @@ static void lkdtm_PANIC_STOP_IRQOFF(void)
stop_machine(panic_stop_irqoff_fn, &v, cpu_online_mask);
}
static bool wait_for_panic;
static enum hrtimer_restart panic_in_hardirq(struct hrtimer *timer)
{
panic("from hard IRQ context");
wait_for_panic = false;
return HRTIMER_NORESTART;
}
static void lkdtm_PANIC_IN_HARDIRQ(void)
{
struct hrtimer timer;
wait_for_panic = true;
hrtimer_setup_on_stack(&timer, panic_in_hardirq,
CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
hrtimer_start(&timer, us_to_ktime(100), HRTIMER_MODE_REL_HARD);
while (wait_for_panic)
;
hrtimer_cancel(&timer);
}
static void lkdtm_BUG(void)
{
BUG();
}
static bool wait_for_bug;
static enum hrtimer_restart bug_in_hardirq(struct hrtimer *timer)
{
BUG();
wait_for_bug = false;
return HRTIMER_NORESTART;
}
static void lkdtm_BUG_IN_HARDIRQ(void)
{
struct hrtimer timer;
wait_for_bug = true;
hrtimer_setup_on_stack(&timer, bug_in_hardirq,
CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
hrtimer_start(&timer, us_to_ktime(100), HRTIMER_MODE_REL_HARD);
while (wait_for_bug)
;
hrtimer_cancel(&timer);
}
static int warn_counter;
static void lkdtm_WARNING(void)
@@ -696,7 +747,9 @@ static noinline void lkdtm_CORRUPT_PAC(void)
static struct crashtype crashtypes[] = {
CRASHTYPE(PANIC),
CRASHTYPE(PANIC_STOP_IRQOFF),
CRASHTYPE(PANIC_IN_HARDIRQ),
CRASHTYPE(BUG),
CRASHTYPE(BUG_IN_HARDIRQ),
CRASHTYPE(WARNING),
CRASHTYPE(WARNING_MESSAGE),
CRASHTYPE(EXCEPTION),

2
tools/testing/selftests/lkdtm/tests.txt
View File

@@ -1,6 +1,8 @@
#PANIC
#PANIC_STOP_IRQOFF Crashes entire system
#PANIC_IN_HARDIRQ Crashes entire system
BUG kernel BUG at
#BUG_IN_HARDIRQ Crashes entire system
WARNING WARNING:
WARNING_MESSAGE message trigger
EXCEPTION