The patch titled
Subject: mm: introduce clear_highpage_kasan_tagged
has been added to the -mm mm-unstable branch. Its filename is
mm-introduce-clear_highpage_kasan_tagged.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-introduce-clear_highpage_kasan_tagged.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: mm: introduce clear_highpage_kasan_tagged
Date: Thu, 9 Jun 2022 20:18:46 +0200
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@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/highmem.h | 10 ++++++++++
mm/page_alloc.c | 8 ++------
2 files changed, 12 insertions(+), 6 deletions(-)
--- a/include/linux/highmem.h~mm-introduce-clear_highpage_kasan_tagged
+++ a/include/linux/highmem.h
@@ -243,6 +243,16 @@ static inline void clear_highpage(struct
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)
--- a/mm/page_alloc.c~mm-introduce-clear_highpage_kasan_tagged
+++ a/mm/page_alloc.c
@@ -1310,12 +1310,8 @@ static void kernel_init_pages(struct pag
/* s390's use of memset() could override KASAN redzones. */
kasan_disable_current();
- for (i = 0; i < numpages; i++) {
- u8 tag = page_kasan_tag(page + i);
- page_kasan_tag_reset(page + i);
- clear_highpage(page + i);
- page_kasan_tag_set(page + i, tag);
- }
+ for (i = 0; i < numpages; i++)
+ clear_highpage_kasan_tagged(page + i);
kasan_enable_current();
}
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
mm-rename-kernel_init_free_pages-to-kernel_init_pages.patch
mm-introduce-clear_highpage_kasan_tagged.patch
kasan-fix-zeroing-vmalloc-memory-with-hw_tags.patch
