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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>
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1 changed files with 1 additions and 1 deletions
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@ -69,7 +69,7 @@ void lkdtm_WARNING(void)
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void lkdtm_EXCEPTION(void)
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void lkdtm_EXCEPTION(void)
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{
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{
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*((int *) 0) = 0;
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*((volatile int *) 0) = 0;
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}
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}
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void lkdtm_LOOP(void)
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void lkdtm_LOOP(void)
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