On Mon, Sep 01, 2025 at 11:46:22AM +0100, Yeoreum Yun wrote: > Since Armv8.9, FEATURE_MTE_STORE_ONLY feature is introduced to restrict > raise of tag check fault on store operation only. > Introcude KASAN write only mode based on this feature. > > KASAN write only mode restricts KASAN checks operation for write only and > omits the checks for fetch/read operations when accessing memory. > So it might be used not only debugging enviroment but also normal > enviroment to check memory safty. > > This features can be controlled with "kasan.write_only" arguments. > When "kasan.write_only=on", KASAN checks write operation only otherwise > KASAN checks all operations. > > This changes the MTE_STORE_ONLY feature as BOOT_CPU_FEATURE like > ARM64_MTE_ASYMM so that makes it initialise in kasan_init_hw_tags() > with other function together. > > Signed-off-by: Yeoreum Yun <yeoreum.yun@xxxxxxx> > Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxx> Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
