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Date: Wed, 16 Feb 2011 16:41:30 +0800
From: Eugene Teo <eugene@...hat.com>
To: oss-security@...ts.openwall.com
CC: "Steven M. Christey" <coley@...us.mitre.org>
Subject: CVE request - kernel: xfs infoleak
From Dan R0s3nbug5, "The FSGEOMETRY_V1 ioctl (and its compat
equivalent) calls out to xfs_fs_geometry() with a version number of 3.
This code path does not fill in the logsunit member of the passed
xfs_fsop_geom_t, leading to the leaking of four bytes of uninitialized
stack data to potentially unprivileged callers. Since all other members
are filled in all code paths and there are no padding bytes in this
structure, it's safe to avoid an expensive memset() in favor of just
clearing this one field."
https://patchwork.kernel.org/patch/555461/
https://bugzilla.redhat.com/show_bug.cgi?id=677260
Eugene
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