Merge: net: gso: fix panic on frag_list with mixed head alloc types

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/2001

Bugzilla: https://bugzilla.redhat.com/2166641

commit 9e4b7a9
Author: Jiri Benc <jbenc@redhat.com>
Date:   Wed Nov 2 17:53:25 2022 +0100

    net: gso: fix panic on frag_list with mixed head alloc types

    Since commit 3dcbdb1 ("net: gso: Fix skb_segment splat when
    splitting gso_size mangled skb having linear-headed frag_list"), it is
    allowed to change gso_size of a GRO packet. However, that commit assumes
    that "checking the first list_skb member suffices; i.e if either of the
    list_skb members have non head_frag head, then the first one has too".

    It turns out this assumption does not hold. We've seen BUG_ON being hit
    in skb_segment when skbs on the frag_list had differing head_frag with
    the vmxnet3 driver. This happens because __netdev_alloc_skb and
    __napi_alloc_skb can return a skb that is page backed or kmalloced
    depending on the requested size. As the result, the last small skb in
    the GRO packet can be kmalloced.

    There are three different locations where this can be fixed:

    (1) We could check head_frag in GRO and not allow GROing skbs with
        different head_frag. However, that would lead to performance
        regression on normal forward paths with unmodified gso_size, where
        !head_frag in the last packet is not a problem.

    (2) Set a flag in bpf_skb_net_grow and bpf_skb_net_shrink indicating
        that NETIF_F_SG is undesirable. That would need to eat a bit in
        sk_buff. Furthermore, that flag can be unset when all skbs on the
        frag_list are page backed. To retain good performance,
        bpf_skb_net_grow/shrink would have to walk the frag_list.

    (3) Walk the frag_list in skb_segment when determining whether
        NETIF_F_SG should be cleared. This of course slows things down.

    This patch implements (3). To limit the performance impact in
    skb_segment, the list is walked only for skbs with SKB_GSO_DODGY set
    that have gso_size changed. Normal paths thus will not hit it.

    We could check only the last skb but since we need to walk the whole
    list anyway, let's stay on the safe side.

    Fixes: 3dcbdb1 ("net: gso: Fix skb_segment splat when splitting gso_size mangled skb having linear-headed frag_list")
    Signed-off-by: Jiri Benc <jbenc@redhat.com>
    Reviewed-by: Willem de Bruijn <willemb@google.com>
    Link: https://lore.kernel.org/r/e04426a6a91baf4d1081e1b478c82b5de25fdf21.1667407944.git.jbenc@redhat.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Jiri Benc <jbenc@redhat.com>

Approved-by: Paolo Abeni <pabeni@redhat.com>
Approved-by: Hangbin Liu <haliu@redhat.com>
Approved-by: Andrea Claudi <aclaudi@redhat.com>
Approved-by: Ivan Vecera <ivecera@redhat.com>

Signed-off-by: Herton R. Krzesinski <herton@redhat.com>

Author: Herton R. Krzesinski

net/core/skbuff.c

@@ -4121,23 +4121,25 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
 	int i = 0;
 	int pos;
 
-	if (list_skb && !list_skb->head_frag && skb_headlen(list_skb) &&
-	    (skb_shinfo(head_skb)->gso_type & SKB_GSO_DODGY)) {
-		/* gso_size is untrusted, and we have a frag_list with a linear
-		 * non head_frag head.
-		 *
-		 * (we assume checking the first list_skb member suffices;
-		 * i.e if either of the list_skb members have non head_frag
-		 * head, then the first one has too).
-		 *
-		 * If head_skb's headlen does not fit requested gso_size, it
-		 * means that the frag_list members do NOT terminate on exact
-		 * gso_size boundaries. Hence we cannot perform skb_frag_t page
-		 * sharing. Therefore we must fallback to copying the frag_list
-		 * skbs; we do so by disabling SG.
-		 */
-		if (mss != GSO_BY_FRAGS && mss != skb_headlen(head_skb))
-			features &= ~NETIF_F_SG;
+	if ((skb_shinfo(head_skb)->gso_type & SKB_GSO_DODGY) &&
+	    mss != GSO_BY_FRAGS && mss != skb_headlen(head_skb)) {
+		struct sk_buff *check_skb;
+
+		for (check_skb = list_skb; check_skb; check_skb = check_skb->next) {
+			if (skb_headlen(check_skb) && !check_skb->head_frag) {
+				/* gso_size is untrusted, and we have a frag_list with
+				 * a linear non head_frag item.
+				 *
+				 * If head_skb's headlen does not fit requested gso_size,
+				 * it means that the frag_list members do NOT terminate
+				 * on exact gso_size boundaries. Hence we cannot perform
+				 * skb_frag_t page sharing. Therefore we must fallback to
+				 * copying the frag_list skbs; we do so by disabling SG.
+				 */
+				features &= ~NETIF_F_SG;
+				break;
+			}
+		}
 	}
 
 	__skb_push(head_skb, doffset);