From: Eric Dumazet <edumazet@google.com>
Date: Fri, 2 Dec 2016 17:44:53 +0000 (-0800)
Subject: net: avoid signed overflows for SO_{SND|RCV}BUFFORCE
X-Git-Tag: v3.2.85~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c516724814d826ae1a90849e24e386c2ad81a845;p=pandora-kernel.git

net: avoid signed overflows for SO_{SND|RCV}BUFFORCE

commit b98b0bc8c431e3ceb4b26b0dfc8db509518fb290 upstream.

CAP_NET_ADMIN users should not be allowed to set negative
sk_sndbuf or sk_rcvbuf values, as it can lead to various memory
corruptions, crashes, OOM...

Note that before commit 82981930125a ("net: cleanups in
sock_setsockopt()"), the bug was even more serious, since SO_SNDBUF
and SO_RCVBUF were vulnerable.

This needs to be backported to all known linux kernels.

Again, many thanks to syzkaller team for discovering this gem.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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