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(parent: f655b72) | 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, 13 Apr 2022 19:00:57 +0000 (21:00 +0200)
commit71c8df33fd777c7628f6fbc09b14e84806c55914
tree2da63ad733ae3d79b634cb4f644f69d291029e6ftree
parentf655b724b4407ec4284b52c6e957d3d344eb159acommit | 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
Linux 6.x block layer and io_uring tree(s)