Hi, While doing more array_size() scans on the kernel, and reviewing recent[1] struct_size() work[2], it became clear we needed helpers to perform composed saturating adds and multiplies. This creates those helpers and updates the self tests to check them. v1: https://lore.kernel.org/lkml/20210920180853.1825195-1-keescook@xxxxxxxxxxxx/ v2: - use static inlines instead of macros (Rasmus) - undef local helpers defs in selftest (Rasmus) - Make sure to keep saturation for size_sub() arguments - update selftests for size_sub() behavior - Add reviews Thanks, -Kees [1] https://lore.kernel.org/linux-hardening/202201241213.82E7D9F598@keescook/ [2] https://lore.kernel.org/lkml/?q=%22open-coded+arithmetic%22 Kees Cook (2): test_overflow: Regularize test reporting output overflow: Implement size_t saturating arithmetic helpers Documentation/process/deprecated.rst | 20 +++- include/linux/overflow.h | 110 +++++++++++-------- lib/test_overflow.c | 152 ++++++++++++++++++++++----- 3 files changed, 214 insertions(+), 68 deletions(-) -- 2.30.2
