tjh.dev
+53
drivers/misc/lkdtm/bugs.c
+53
drivers/misc/lkdtm/bugs.c
···
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#include "lkdtm.h"
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#include <linux/cpu.h>
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#include <linux/list.h>
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#include <linux/hrtimer.h>
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#include <linux/sched.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/task_stack.h>
···
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stop_machine(panic_stop_irqoff_fn, &v, cpu_online_mask);
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}
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static bool wait_for_panic;
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static enum hrtimer_restart panic_in_hardirq(struct hrtimer *timer)
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{
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panic("from hard IRQ context");
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wait_for_panic = false;
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return HRTIMER_NORESTART;
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}
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static void lkdtm_PANIC_IN_HARDIRQ(void)
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{
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struct hrtimer timer;
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wait_for_panic = true;
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hrtimer_setup_on_stack(&timer, panic_in_hardirq,
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CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
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hrtimer_start(&timer, us_to_ktime(100), HRTIMER_MODE_REL_HARD);
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while (wait_for_panic)
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;
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hrtimer_cancel(&timer);
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}
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static void lkdtm_BUG(void)
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{
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BUG();
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}
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static bool wait_for_bug;
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static enum hrtimer_restart bug_in_hardirq(struct hrtimer *timer)
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{
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BUG();
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wait_for_bug = false;
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return HRTIMER_NORESTART;
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}
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static void lkdtm_BUG_IN_HARDIRQ(void)
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{
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struct hrtimer timer;
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wait_for_bug = true;
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hrtimer_setup_on_stack(&timer, bug_in_hardirq,
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CLOCK_MONOTONIC, HRTIMER_MODE_REL_HARD);
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hrtimer_start(&timer, us_to_ktime(100), HRTIMER_MODE_REL_HARD);
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while (wait_for_bug)
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;
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hrtimer_cancel(&timer);
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}
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static int warn_counter;
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static struct crashtype crashtypes[] = {
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CRASHTYPE(PANIC),
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CRASHTYPE(PANIC_STOP_IRQOFF),
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CRASHTYPE(PANIC_IN_HARDIRQ),
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CRASHTYPE(BUG),
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CRASHTYPE(BUG_IN_HARDIRQ),
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CRASHTYPE(WARNING),
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CRASHTYPE(WARNING_MESSAGE),
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CRASHTYPE(EXCEPTION),