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| author | Greg Kurz <groug@kaod.org> | 2020-10-03 13:01:52 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-10-04 10:43:03 +0300 |
| commit | 0210a8db2aeca393fb3067e234967877e3146266 (patch) | |
| tree | 43deeb36d07efb02ea3695934c31c2bf3ebd894d /Kconfig | |
| parent | 37787e9f81e2e586b526ff5c29c94e4f41513e80 (diff) | |
| download | linux-0210a8db2aeca393fb3067e234967877e3146266.tar.xz | |
vhost: Don't call access_ok() when using IOTLB
When the IOTLB device is enabled, the vring addresses we get
from userspace are GIOVAs. It is thus wrong to pass them down
to access_ok() which only takes HVAs.
Access validation is done at prefetch time with IOTLB. Teach
vq_access_ok() about that by moving the (vq->iotlb) check
from vhost_vq_access_ok() to vq_access_ok(). This prevents
vhost_vring_set_addr() to fail when verifying the accesses.
No behavior change for vhost_vq_access_ok().
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1883084
Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API")
Cc: jasowang@redhat.com
CC: stable@vger.kernel.org # 4.14+
Signed-off-by: Greg Kurz <groug@kaod.org>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/160171931213.284610.2052489816407219136.stgit@bahia.lan
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'Kconfig')
0 files changed, 0 insertions, 0 deletions