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| author | seokhoon.yoon | 2016-05-21 01:58:47 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2016-05-21 02:58:30 +0200 |
| commit | 29b52de182acf50f85a8284ad39104d84c9bbf57 (patch) | |
| tree | 79b8aa6e41e9107ef1c71eee4f0285d81fc0d80b /mm/page_idle.c | |
| parent | mm: disable fault around on emulated access bit architecture (diff) | |
| download | kernel-qcow2-linux-29b52de182acf50f85a8284ad39104d84c9bbf57.tar.gz kernel-qcow2-linux-29b52de182acf50f85a8284ad39104d84c9bbf57.tar.xz kernel-qcow2-linux-29b52de182acf50f85a8284ad39104d84c9bbf57.zip | |
mm, kasan: fix to call kasan_free_pages() after poisoning page
When CONFIG_PAGE_POISONING and CONFIG_KASAN is enabled,
free_pages_prepare()'s codeflow is below.
1)kmemcheck_free_shadow()
2)kasan_free_pages()
- set shadow byte of page is freed
3)kernel_poison_pages()
3.1) check access to page is valid or not using kasan
---> error occur, kasan think it is invalid access
3.2) poison page
4)kernel_map_pages()
So kasan_free_pages() should be called after poisoning the page.
Link: http://lkml.kernel.org/r/1463220405-7455-1-git-send-email-iamyooon@gmail.com
Signed-off-by: seokhoon.yoon <iamyooon@gmail.com>
Cc: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Laura Abbott <labbott@fedoraproject.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_idle.c')
0 files changed, 0 insertions, 0 deletions