Juergen Gross 4172234498 xen/xenbus: ensure xenbus_map_ring_valloc() returns proper grant status ... [ Upstream commit 6b51fd3f65a22e3d1471b18a1d56247e246edd46 ] xenbus_map_ring_valloc() maps a ring page and returns the status of the used grant (0 meaning success). There are Xen hypervisors which might return the value 1 for the status of a failed grant mapping due to a bug. Some callers of xenbus_map_ring_valloc() test for errors by testing the returned status to be less than zero, resulting in no error detected and crashing later due to a not available ring page. Set the return value of xenbus_map_ring_valloc() to GNTST_general_error in case the grant status reported by Xen is greater than zero. This is part of XSA-316. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Wei Liu <wl@xen.org> Link: https://lore.kernel.org/r/20200326080358.1018-1-jgross@suse.com Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-05-02 17:25:58 +02:00
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Makefile
xenbus.h
xenbus_client.c	xen/xenbus: ensure xenbus_map_ring_valloc() returns proper grant status	2020-05-02 17:25:58 +02:00
xenbus_comms.c	xenbus: req->err should be updated before req->state	2020-03-25 08:06:08 +01:00
xenbus_dev_backend.c
xenbus_dev_frontend.c
xenbus_probe.c
xenbus_probe_backend.c
xenbus_probe_frontend.c
xenbus_xs.c