xfrm: esp: avoid in-place decrypt on shared skb frags

jira VULN-184830
cve CVE-2026-43284
commit-author Kuan-Ting Chen <h3xrabbit@gmail.com>
commit f4c50a4
upstream-diff |
	While this kernel lacks MSG_SPLICE_PAGES, it still has udp_sendpage().
	Upstream didn't patch udp_sendpage() because sendpage was removed
	entirely in favor of MSG_SPLICE_PAGES. In this kernel, splice() can
	still attach a page cache page to an IPv4 datagram via sendpage.
	Therefore, udp_sendpage() must be patched instead.
        IPv6 does not have MSG_SPLICE_PAGES but the __ip_addend_data()
        path is exercisable in ipv6/esp6.c so we're including that
        block.

MSG_SPLICE_PAGES can attach pages from a pipe directly to an skb. TCP
marks such skbs with SKBFL_SHARED_FRAG after skb_splice_from_iter(),
so later paths that may modify packet data can first make a private
copy. The IPv4/IPv6 datagram append paths did not set this flag when
splicing pages into UDP skbs.

That leaves an ESP-in-UDP packet made from shared pipe pages looking
like an ordinary uncloned nonlinear skb. ESP input then takes the no-COW
fast path for uncloned skbs without a frag_list and decrypts in place
over data that is not owned privately by the skb.

Mark IPv4/IPv6 datagram splice frags with SKBFL_SHARED_FRAG, matching
TCP. Also make ESP input fall back to skb_cow_data() when the flag is
present, so ESP does not decrypt externally backed frags in place.
Private nonlinear skb frags still use the existing fast path.

This intentionally does not change ESP output. In esp_output_head(),
the path that appends the ESP trailer to existing skb tailroom without
calling skb_cow_data() is not reachable for nonlinear skbs:
skb_tailroom() returns zero when skb->data_len is nonzero, while ESP
tailen is positive. Thus ESP output will either use the separate
destination-frag path or fall back to skb_cow_data().

Fixes: cac2661 ("esp4: Avoid skb_cow_data whenever possible")
Fixes: 03e2a30 ("esp6: Avoid skb_cow_data whenever possible")
Fixes: 7da0dde ("ip, udp: Support MSG_SPLICE_PAGES")
Fixes: 6d8192b ("ip6, udp6: Support MSG_SPLICE_PAGES")
	Reported-by: Hyunwoo Kim <imv4bel@gmail.com>
	Reported-by: Kuan-Ting Chen <h3xrabbit@gmail.com>
	Tested-by: Hyunwoo Kim <imv4bel@gmail.com>
	Cc: stable@vger.kernel.org
	Signed-off-by: Kuan-Ting Chen <h3xrabbit@gmail.com>
	Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
(cherry picked from commit f4c50a4)
Signed-off-by: Shreeya Patel <spatel@ciq.com>
Signed-off-by: Jonathan Maple <jonathan.l.maple@gmail.com>

Author: PlaidCat

net/ipv4/esp4.c

@@ -918,7 +918,8 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
 			nfrags = 1;
 
 			goto skip_cow;
-		} else if (!skb_has_frag_list(skb)) {
+		} else if (!skb_has_frag_list(skb) &&
+			   !skb_has_shared_frag(skb)) {
 			nfrags = skb_shinfo(skb)->nr_frags;
 			nfrags++;
 

net/ipv4/ip_output.c

@@ -1438,6 +1438,9 @@ ssize_t	ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
 			goto error;
 		}
 
+		if (!(flags & MSG_NO_SHARED_FRAGS))
+			skb_shinfo(skb)->flags |= SKBFL_SHARED_FRAG;
+
 		if (skb->ip_summed == CHECKSUM_NONE) {
 			__wsum csum;
 			csum = csum_page(page, offset, len);

net/ipv6/esp6.c

@@ -958,7 +958,8 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
 			nfrags = 1;
 
 			goto skip_cow;
-		} else if (!skb_has_frag_list(skb)) {
+		} else if (!skb_has_frag_list(skb) &&
+                   !skb_has_shared_frag(skb)) {
 			nfrags = skb_shinfo(skb)->nr_frags;
 			nfrags++;