oss-security - CVE Request -- kernel: recv{from,msg}() on an rds socket can leak kernel memory

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Message-ID: <20120726152511.GN12159@dhcp-25-225.brq.redhat.com>
Date: Thu, 26 Jul 2012 17:25:12 +0200
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE Request -- kernel: recv{from,msg}() on an rds socket can leak
 kernel memory

Two similar issues:

1) Reported by Jay Fenlason and Doug Ledford:
recvfrom() on an RDS socket can disclose sizeof(struct
sockaddr_storage)-sizeof(struct sockaddr_in) bytes of kernel stack to
userspace when receiving a datagram.

2) Reported by Jay Fenlason:
recv{from,msg}() on an RDS socket can disclose sizeof(struct
sockaddr_storage) bytes of kernel stack to userspace when other code
paths are taken.

Both issues end in rds_recvmsg() so one CVE is sufficient.

Upstream commit:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=06b6a1cf6e776426766298d055bb3991957d90a7

Thanks,
-- 
Petr Matousek / Red Hat Security Response Team

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