tree 1e73133269563bae2dd59e2790da18ee72618e18
parent d43fdae7bac2def8c4314b5a49822cb7f08a45f1
author Jinbum Park <jinb.park7@gmail.com> 1532751644 +0900
committer Jens Axboe <axboe@kernel.dk> 1532790522 -0600

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>