diff options
| author | Philippe Mathieu-Daudé <philmd@redhat.com> | 2021-11-24 17:15:35 +0100 |
|---|---|---|
| committer | Michael Roth <michael.roth@amd.com> | 2021-12-14 15:05:05 -0600 |
| commit | 71ba2adfeb4ca63015d4a51a665e67c46a06e822 (patch) | |
| tree | db97b9da315fe014d31cef312b0b25de7298b028 /hw/char | |
| parent | 7629818574eb67d2a9eb5db313c935bcf1d4e557 (diff) | |
hw/block/fdc: Kludge missing floppy drive to fix CVE-2021-20196
Guest might select another drive on the bus by setting the
DRIVE_SEL bit of the DIGITAL OUTPUT REGISTER (DOR).
The current controller model doesn't expect a BlockBackend
to be NULL. A simple way to fix CVE-2021-20196 is to create
an empty BlockBackend when it is missing. All further
accesses will be safely handled, and the controller state
machines keep behaving correctly.
Cc: qemu-stable@nongnu.org
Fixes: CVE-2021-20196
Reported-by: Gaoning Pan (Ant Security Light-Year Lab) <pgn@zju.edu.cn>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20211124161536.631563-3-philmd@redhat.com
BugLink: https://bugs.launchpad.net/qemu/+bug/1912780
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/338
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
(cherry picked from commit 1ab95af033a419e7a64e2d58e67dd96b20af5233)
Signed-off-by: Michael Roth <michael.roth@amd.com>
Diffstat (limited to 'hw/char')
0 files changed, 0 insertions, 0 deletions