]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
kasan: test: avoid corrupting memory in kasan_rcu_uaf
authorAndrey Konovalov <andreyknvl@gmail.com>
Thu, 2 Sep 2021 21:57:53 +0000 (14:57 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 3 Sep 2021 16:58:15 +0000 (09:58 -0700)
commitf16de0bcdb55bf18e2533ca625f3e4b4952f254c
tree154d330c2fc2ccec05d47e93b90c14e4b334b610
parent756e5a47a5ddf0caa3708f922385a92af9d330b5
kasan: test: avoid corrupting memory in kasan_rcu_uaf

kasan_rcu_uaf() writes to freed memory via kasan_rcu_reclaim(), which is
only safe with the GENERIC mode (as it uses quarantine).  For other modes,
this test corrupts kernel memory, which might result in a crash.

Turn the write into a read.

Link: https://lkml.kernel.org/r/b6f2c3bf712d2457c783fa59498225b66a634f62.1628779805.git.andreyknvl@gmail.com
Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/test_kasan_module.c