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(parent: 5e580cc) | patch
dm ioctl: prevent potential spectre v1 gadget
authorJordy Zomer <jordy@jordyzomer.github.io>
Sat, 29 Jan 2022 14:58:39 +0000 (15:58 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 20 Apr 2022 07:08:27 +0000 (09:08 +0200)
commit58880025e3362024f6d8ea01cb0c7a5df6c84ba6
tree1fddd1e060f5ba9b9a330bbd6f68b99a6ce0c718tree | snapshot
parent5e580cce4d58b35e0ceb875578a53b49cc2e98b1commit | diff
dm ioctl: prevent potential spectre v1 gadget

[ Upstream commit cd9c88da171a62c4b0f1c70e50c75845969fbc18 ]

It appears like cmd could be a Spectre v1 gadget as it's supplied by a
user and used as an array index. Prevent the contents of kernel memory
from being leaked to userspace via speculative execution by using
array_index_nospec.

Signed-off-by: Jordy Zomer <jordy@pwning.systems>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/md/dm-ioctl.c diff | blob | history
wrapfs-4.14.y