v6: rename wrapping_inc/dec to wraping_assign_add/sub (andy)
v5: https://lore.kernel.org/all/[email protected]/
v4: https://lore.kernel.org/all/[email protected]/
v3: https://lore.kernel.org/all/[email protected]/
v2: https://lore.kernel.org/all/[email protected]/
v1: https://lore.kernel.org/all/[email protected]/
Hi,
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 add/sub/mul
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 wrapping_add(), wrapping_sub(), and wrapping_mul()
overflow: Introduce wrapping_assign_add() and wrapping_assign_sub()
include/linux/overflow.h | 98 +++++++++++++++++++++++++++++++++++-----
lib/overflow_kunit.c | 67 +++++++++++++++++++++++++--
2 files changed, 149 insertions(+), 16 deletions(-)
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2.34.1