oss-sec mailing list archives
CVE request -- kernel: cifs: dentry refcount leak when opening a FIFO on lookup leads to panic on unmount
From: Petr Matousek <pmatouse () redhat com>
Date: Tue, 28 Feb 2012 16:15:02 +0100
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
Current thread:
- CVE request -- kernel: cifs: dentry refcount leak when opening a FIFO on lookup leads to panic on unmount Petr Matousek (Feb 28)