]> git.baikalelectronics.ru Git - kernel.git/commit
pktcdvd: Fix possible Spectre-v1 for pkt_devs
authorJinbum Park <jinb.park7@gmail.com>
Sat, 28 Jul 2018 04:20:44 +0000 (13:20 +0900)
committerJens Axboe <axboe@kernel.dk>
Sat, 28 Jul 2018 15:08:42 +0000 (09:08 -0600)
commit22e0f2b8a53d51202de3d37b361e310897f5675b
tree1e73133269563bae2dd59e2790da18ee72618e18
parenta363807e40182df34e81eadaa7cc00c56d9925e3
pktcdvd: Fix possible Spectre-v1 for pkt_devs

User controls @dev_minor which to be used as index of pkt_devs.
So, It can be exploited via Spectre-like attack. (speculative execution)

This kind of attack leaks address of pkt_devs, [1]
It leads an attacker to bypass security mechanism such as KASLR.

So sanitize @dev_minor before using it to prevent attack.

[1] https://github.com/jinb-park/linux-exploit/
tree/master/exploit-remaining-spectre-gadget/leak_pkt_devs.c

Signed-off-by: Jinbum Park <jinb.park7@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
drivers/block/pktcdvd.c