Date: Tue, 28 Feb 2012 16:15:02 +0100 From: Petr Matousek <pmatouse@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE request -- kernel: cifs: dentry refcount leak when opening a FIFO on lookup leads to panic on unmount The cifs code will attempt to open files on lookup under certain circumstances. What happens though if we find that the file we opened was actually a FIFO or other special file? Currently, the open filehandle just ends up being leaked leading to a dentry refcount mismatch and oops on umount. An unprivileged local user could use this flaw to crash the system. Introduced by: a6ce4932fbdbcd8f8e8c6df76812014351c32892 (Linux kernel 2.6.31) Proposed upstream patch: http://thread.gmane.org/gmane.linux.kernel.cifs/5526 References: https://bugzilla.redhat.com/show_bug.cgi?id=798293 http://thread.gmane.org/gmane.linux.kernel.cifs/5526 Thanks, -- Petr Matousek / Red Hat Security Response Team
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