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ed6c8c1fe6
commit d219d2a9a92e39aa92799efe8f2aa21259b6dd82 upstream. When the check_[op]_overflow() helpers were introduced, all arguments were required to be the same type to make the fallback macros simpler. However, now that the fallback macros have been removed[1], it is fine to allow mixed types, which makes using the helpers much more useful, as they can be used to test for type-based overflows (e.g. adding two large ints but storing into a u8), as would be handy in the drm core[2]. Remove the restriction, and add additional self-tests that exercise some of the mixed-type overflow cases, and double-check for accidental macro side-effects. [1] https://git.kernel.org/linus/4eb6bd55cfb22ffc20652732340c4962f3ac9a91 [2] https://lore.kernel.org/lkml/20220824084514.2261614-2-gwan-gyeong.mun@intel.com Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: linux-hardening@vger.kernel.org Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com> Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Tested-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com> Signed-off-by: Kees Cook <keescook@chromium.org> [florian: Drop changes to lib/test_overflow.c] Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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