kasan, page_alloc: rework kasan_unpoison_pages call site
authorAndrey Konovalov <andreyknvl@google.com>
Fri, 25 Mar 2022 01:10:43 +0000 (18:10 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 25 Mar 2022 02:06:46 +0000 (19:06 -0700)
commite9d0ca9228162f5442b751edf8c9721b15dcfa1e
tree953a159a1d96cfa643f95c5e672cacd1c4533bdb
parent7e3cbba65de22f20ad18a2de09f65238bfe84c5b
kasan, page_alloc: rework kasan_unpoison_pages call site

Rework the checks around kasan_unpoison_pages() call in post_alloc_hook().

The logical condition for calling this function is:

 - If a software KASAN mode is enabled, we need to mark shadow memory.

 - Otherwise, HW_TAGS KASAN is enabled, and it only makes sense to set
   tags if they haven't already been cleared by tag_clear_highpage(),
   which is indicated by init_tags.

This patch concludes the changes for post_alloc_hook().

Link: https://lkml.kernel.org/r/0ecebd0d7ccd79150e3620ea4185a32d3dfe912f.1643047180.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/page_alloc.c