lkdtm: add "SPINLOCKUP" trigger
For additional lockup testing, add "SPINLOCKUP" to trigger a spinlock deadlock when triggered twice. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -78,6 +78,7 @@ enum ctype {
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CT_WRITE_AFTER_FREE,
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CT_SOFTLOCKUP,
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CT_HARDLOCKUP,
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CT_SPINLOCKUP,
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CT_HUNG_TASK,
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};
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@ -106,6 +107,7 @@ static char* cp_type[] = {
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"WRITE_AFTER_FREE",
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"SOFTLOCKUP",
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"HARDLOCKUP",
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"SPINLOCKUP",
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"HUNG_TASK",
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};
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@ -123,6 +125,7 @@ static enum cname cpoint = CN_INVALID;
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static enum ctype cptype = CT_NONE;
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static int count = DEFAULT_COUNT;
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static DEFINE_SPINLOCK(count_lock);
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static DEFINE_SPINLOCK(lock_me_up);
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module_param(recur_count, int, 0644);
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MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\
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@ -345,6 +348,10 @@ static void lkdtm_do_action(enum ctype which)
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for (;;)
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cpu_relax();
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break;
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case CT_SPINLOCKUP:
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/* Must be called twice to trigger. */
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spin_lock(&lock_me_up);
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break;
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case CT_HUNG_TASK:
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set_current_state(TASK_UNINTERRUPTIBLE);
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schedule();
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