From: Michael Davidson <[email protected]> Add a volatile qualifier where a NULL pointer is deliberately dereferenced to trigger a panic.
Without the volatile qualifier clang will issue the following warning: "indirection of non-volatile null pointer will be deleted, not trap [-Wnull-dereference]" and replace the pointer reference with a __builtin_trap() (which generates a ud2 instruction on x86_64). Signed-off-by: Michael Davidson <[email protected]> Signed-off-by: Matthias Kaehlcke <[email protected]> --- drivers/misc/lkdtm_bugs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/lkdtm_bugs.c b/drivers/misc/lkdtm_bugs.c index e3f4cd8876b5..d734d75afade 100644 --- a/drivers/misc/lkdtm_bugs.c +++ b/drivers/misc/lkdtm_bugs.c @@ -67,7 +67,7 @@ void lkdtm_WARNING(void) void lkdtm_EXCEPTION(void) { - *((int *) 0) = 0; + *((volatile int *) 0) = 0; } void lkdtm_LOOP(void) -- 2.12.2.762.g0e3151a226-goog
