linux

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Andrey Konovalov 1123c2fb9d kasan: fix quarantine conflicting with init_on_free

[ Upstream commit 26dca996ea7b1ac7008b6b6063fc88b849e3ac3e ]

KASAN's quarantine might save its metadata inside freed objects.  As
this happens after the memory is zeroed by the slab allocator when
init_on_free is enabled, the memory coming out of quarantine is not
properly zeroed.

This causes lib/test_meminit.c tests to fail with Generic KASAN.

Zero the metadata when the object is removed from quarantine.

Link: https://lkml.kernel.org/r/2805da5df4b57138fdacd671f5d227d58950ba54.1640037083.git.andreyknvl@google.com
Fixes: 6471384af2a6 ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-03-08 19:12:38 +01:00

common.c

Merge branch 'akpm' (patches from Andrew)

2021-06-29 17:29:11 -07:00

generic.c

kasan: allow architectures to provide an outline readiness check

2021-06-29 10:53:53 -07:00

hw_tags.c

Merge branch 'akpm' (patches from Andrew)

2021-09-03 10:08:28 -07:00

init.c

kasan: use MAX_PTRS_PER_* for early shadow tables