OpenBSD patch: XMM exceptions incorrectly handled in i386 kernel

Joel Sing <[email protected]> Mon, 5 Oct 2009 05:21:27 -0600 (MDT)

Newsgroups	gmane.os.openbsd.security.announce
Message-ID	<[email protected]>

XMM exceptions are incorrectly handled in the OpenBSD/i386 kernel, resulting
in a kernel panic that can be triggered by a local user.

This issue has been fixed in -current. Source code patches are available for
OpenBSD 4.4, 4.5 and 4.6.

Patch for OpenBSD 4.6:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.6/i386/002_xmm.patch

Patch for OpenBSD 4.5:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.5/i386/008_xmm.patch

Patch for OpenBSD 4.4:
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/4.4/i386/015_xmm.patch

These patches are also available in the OPENBSD_4_6, OPENBSD_4_5 and
OPENBSD_4_4 patch branches.

Thanks to Slava Pestov for reporting this issue.