diff options
| author | Gustavo A. R. Silva | 2018-12-21 22:47:53 +0100 |
|---|---|---|
| committer | David S. Miller | 2018-12-23 00:09:25 +0100 |
| commit | a95386f0390ab602904d11fe6bd7ea5ef9b136f8 (patch) | |
| tree | 2468c24c4cfbe9c94218153587273bdd7ec9493b /mm/percpu-internal.h | |
| parent | phonet: af_phonet: Fix Spectre v1 vulnerability (diff) | |
| download | kernel-qcow2-linux-a95386f0390ab602904d11fe6bd7ea5ef9b136f8.tar.gz kernel-qcow2-linux-a95386f0390ab602904d11fe6bd7ea5ef9b136f8.tar.xz kernel-qcow2-linux-a95386f0390ab602904d11fe6bd7ea5ef9b136f8.zip | |
nfc: af_nfc: Fix Spectre v1 vulnerability
proto is indirectly controlled by user-space, hence leading to
a potential exploitation of the Spectre variant 1 vulnerability.
This issue was detected with the help of Smatch:
net/nfc/af_nfc.c:42 nfc_sock_create() warn: potential spectre issue 'proto_tab' [w] (local cap)
Fix this by sanitizing proto before using it to index proto_tab.
Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].
[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'mm/percpu-internal.h')
0 files changed, 0 insertions, 0 deletions