Date: Thu, 5 Nov 2009 12:23:39 -0500 (EST) From: Josh Bressers <bressers@...hat.com> To: oss-security@...ts.openwall.com Cc: "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE request: kernel: NULL pointer dereference in nfs4_proc_lock() Please use CVE-2009-3726 Thanks. -- JB ----- "Eugene Teo" <eugeneteo@...nel.sg> wrote: > Quote from upstream commit: > "We just had a case in which a buggy server occasionally returns the > wrong attributes during an OPEN call. While the client does catch this > > sort of condition in nfs4_open_done(), and causes the > nfs4_atomic_open() > to return -EISDIR, the logic in nfs_atomic_lookup() is broken, since > it > causes a fallback to an ordinary lookup instead of just returning the > error. > > When the buggy server then returns a regular file for the fallback > lookup, the VFS allows the open, and bad things start to happen, since > > the open file doesn't have any associated NFSv4 state. > > The fix is firstly to return the EISDIR/ENOTDIR errors immediately, > and > secondly to ensure that we are always careful when dereferencing the > nfs_open_context state pointer." > > Upstream commit: > http://git.kernel.org/linus/d953126a28f97e (v2.6.31-rc4) > > Steps to reproduce the issue/backtraces: > https://bugzilla.redhat.com/show_bug.cgi?id=529227#c0 > > References: > http://www.spinics.net/linux/lists/linux-nfs/msg03357.html > https://bugzilla.redhat.com/show_bug.cgi?id=529227 > > Thanks, Eugene
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