On Wed, Dec 6, 2023 at 3:45 PM Marco Elver <elver@xxxxxxxxxx> wrote: > > The is_kfence_address() implementation tolerates tagged addresses, > i.e. if it receives a tagged non-kfence address, it will never return > true. > > The KASAN_HW_TAGS patches and KFENCE patches were in development > concurrently, and at the time there was some conflict resolution that > happened when both were merged. The > is_kfence_address(kasan_reset_tag(..)) initially came from [1] but was > squashed into 2b8305260fb. > > [1] https://lore.kernel.org/all/9dc196006921b191d25d10f6e611316db7da2efc.1611946152.git.andreyknvl@xxxxxxxxxx/ > > Andrey, do you recall what issue you encountered that needed kasan_reset_tag()? I don't remember at this point, but this could have been just a safety measure. If is_kfence_address tolerates tagged addresses, we should be able to drop these kasan_reset_tag calls.
