On 12/22/18 5:09 PM, David Miller wrote:

From: "Gustavo A. R. Silva" <redacted>
Date: Fri, 21 Dec 2018 15:47:53 -0600

quoted

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 <redacted>

I'll take this directly, and queued up for -stable.

Dave,

I wonder if you can take this one too:

https://lore.kernel.org/lkml/20181221212229.GA32635@embeddedor/ (local)

It's pretty similar to the af_nfc one.

Thanks
--
Gustavo