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(parent: 75517bd) | 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>
Fri, 15 Apr 2022 12:15:02 +0000 (14:15 +0200)
commit7ae2c5b89da3cfaf856df880af27d3bb32a74b3d
tree44c1a67aa5df39bdc621975c4cc51ede35281911tree | snapshot
parent75517bd7e4afad5a800b4d14f80aa7e6f73a9681commit | 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 | blame | history
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git