path: root/drivers
diff options
authorMichael Davidson <md@google.com>2017-04-14 14:15:09 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-04-18 18:03:42 +0200
commit9e18308a5dcc2250a271e598dfe0d917b5522475 (patch)
tree277faf0661876a128d24e7961d19fcc7649b086d /drivers
parent073a457d9ef46b34127f0bdcb879aaf8674819a5 (diff)
misc: lkdtm: Add volatile to intentional NULL pointer reference
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 <md@google.com> Signed-off-by: Matthias Kaehlcke <mka@chromium.org> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/lkdtm_bugs.c b/drivers/misc/lkdtm_bugs.c
index ed4f4c56c796..d9028ef50fbe 100644
--- a/drivers/misc/lkdtm_bugs.c
+++ b/drivers/misc/lkdtm_bugs.c
@@ -69,7 +69,7 @@ void lkdtm_WARNING(void)
void lkdtm_EXCEPTION(void)
- *((int *) 0) = 0;
+ *((volatile int *) 0) = 0;
void lkdtm_LOOP(void)

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