Hi, v3: - reduce patches to just docs and new helpers; we don't need pointer fixes yet. v2: https://lore.kernel.org/all/[email protected]/ v1: https://lore.kernel.org/lkml/[email protected]/
In preparation for gaining instrumentation for signed[1], unsigned[2], and pointer[3] wrap-around, expand the overflow header to include wrap-around helpers that can be used to annotate arithmetic where wrapped calculations are expected (e.g. atomics). After spending time getting the unsigned integer wrap-around sanitizer running warning-free on a basic x86_64 boot[4], I think the *_wrap() helpers first argument being the output type makes the most sense (as suggested by Rasmus). -Kees Link: https://github.com/KSPP/linux/issues/26 [1] Link: https://github.com/KSPP/linux/issues/27 [2] Link: https://github.com/KSPP/linux/issues/344 [3] Link: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/log/?h=devel/overflow/enable-unsigned-sanitizer [4] Kees Cook (3): overflow: Adjust check_*_overflow() kern-doc to reflect results overflow: Introduce add_wrap(), sub_wrap(), and mul_wrap() overflow: Introduce inc_wrap() and dec_wrap() include/linux/overflow.h | 100 ++++++++++++++++++++++++++++++++++----- lib/overflow_kunit.c | 65 +++++++++++++++++++++++-- 2 files changed, 149 insertions(+), 16 deletions(-) -- 2.34.1
