commit 8d9ad8de1c07b07bc75178cda26a7c47f2cc0812 Author: Greg Kroah-Hartman Date: Fri May 8 12:45:22 2026 +0200 Linux 5.10.255 Signed-off-by: Greg Kroah-Hartman commit a6cb440f274a22456ef3e86b457344f1678f38f9 Author: Kuan-Ting Chen Date: Mon May 4 23:27:12 2026 +0800 xfrm: esp: avoid in-place decrypt on shared skb frags commit f4c50a4034e62ab75f1d5cdd191dd5f9c77fdff4 upstream. 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: cac2661c53f3 ("esp4: Avoid skb_cow_data whenever possible") Fixes: 03e2a30f6a27 ("esp6: Avoid skb_cow_data whenever possible") Fixes: 7da0dde68486 ("ip, udp: Support MSG_SPLICE_PAGES") Fixes: 6d8192bd69bb ("ip6, udp6: Support MSG_SPLICE_PAGES") Reported-by: Hyunwoo Kim Reported-by: Kuan-Ting Chen Tested-by: Hyunwoo Kim Cc: stable@vger.kernel.org Signed-off-by: Kuan-Ting Chen Signed-off-by: Steffen Klassert [bwh: Backported to 5.10: set the SKBTX_SHARED_FRAG flag in ip_append_page() instead of __ip{,6}_append_data()] Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman