[PATCH 4.19 26/33] xen/netfront: dont use gnttab_query_foreign_access() for mapped status

Greg Kroah-Hartman
2022-03-10T14:31:50Z

From: Juergen Gross <jgross@suse.com>

Commit 31185df7e2b1d2fa1de4900247a12d7b9c7087eb upstream.

It isn't enough to check whether a grant is still being in use by
calling gnttab_query_foreign_access(), as a mapping could be realized
by the other side just after having called that function.

In case the call was done in preparation of revoking a grant it is
better to do so via gnttab_end_foreign_access_ref() and check the
success of that operation instead.

This is CVE-2022-23037 / part of XSA-396.

Reported-by: Demi Marie Obenour <demi@invisiblethingslab.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/xen-netfront.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -414,14 +414,12 @@ static bool xennet_tx_buf_gc(struct netf
queue->tx_link[id] = TX_LINK_NONE;
skb = queue->tx_skbs[id];
queue->tx_skbs[id] = NULL;
- if (unlikely(gnttab_query_foreign_access(
- queue->grant_tx_ref[id]) != 0)) {
+ if (unlikely(!gnttab_end_foreign_access_ref(
+ queue->grant_tx_ref[id], GNTMAP_readonly))) {
dev_alert(dev,
"Grant still in use by backend domain\n");
goto err;
}
- gnttab_end_foreign_access_ref(
- queue->grant_tx_ref[id], GNTMAP_readonly);
gnttab_release_grant_reference(
&queue->gref_tx_head, queue->grant_tx_ref[id]);
queue->grant_tx_ref[id] = GRANT_INVALID_REF;