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| author | Andrey Konovalov <andreyknvl@google.com> | 2022-06-09 20:18:46 +0200 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-07-03 18:08:39 -0700 |
| commit | d9da8f6cf55eeca642c021912af1890002464c64 (patch) | |
| tree | f858a56b334f12e8324b21707f60fb087276ab78 /include/linux/highmem.h | |
| parent | aeaec8e27eddc147b96fe32df2671980ce7ca87c (diff) | |
| download | lwn-d9da8f6cf55eeca642c021912af1890002464c64.tar.gz lwn-d9da8f6cf55eeca642c021912af1890002464c64.zip | |
mm: introduce clear_highpage_kasan_tagged
Add a clear_highpage_kasan_tagged() helper that does clear_highpage() on a
page potentially tagged by KASAN.
This helper is used by the following patch.
Link: https://lkml.kernel.org/r/4471979b46b2c487787ddcd08b9dc5fedd1b6ffd.1654798516.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/highmem.h')
| -rw-r--r-- | include/linux/highmem.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index fee9835e3793..22379a63e293 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -243,6 +243,16 @@ static inline void clear_highpage(struct page *page) kunmap_local(kaddr); } +static inline void clear_highpage_kasan_tagged(struct page *page) +{ + u8 tag; + + tag = page_kasan_tag(page); + page_kasan_tag_reset(page); + clear_highpage(page); + page_kasan_tag_set(page, tag); +} + #ifndef __HAVE_ARCH_TAG_CLEAR_HIGHPAGE static inline void tag_clear_highpage(struct page *page) |