From: Henry Martin <bsdhenrymartin@gmail.com>
To: netdev@vger.kernel.org
Cc: julius@bairaktaris.de, dsahern@kernel.org, idosch@nvidia.com,
davem@davemloft.net, edumazet@kernel.org, kuba@kernel.org,
pabeni@redhat.com, horms@kernel.org,
steffen.klassert@secunet.com, willemb@google.com,
jiayuan.chen@linux.dev, mfleming@cloudflare.com,
almasrymina@google.com, bigeasy@linutronix.de,
richardbgobert@gmail.com, ecree.xilinx@gmail.com,
linux-kernel@vger.kernel.org,
Henry Martin <bsdhenrymartin@gmail.com>
Subject: Re: [PATCH net v4 1/4] net: make room for the tunnel header in skb_segment_list()
Date: Wed, 4 Nov 2026 11:42:38 +0800 [thread overview]
Message-ID: <20261104034238.676662-1-bsdhenrymartin@gmail.com> (raw)
In-Reply-To: <b27640960edcb8e072fdd2e8d282c1deee747b8a.1792838740.git.julius@bairaktaris.de>
Tested this on v7.4-rc1 (6628e7d4c6b2, KASAN build) with an
independent reproducer (vxlan, fraglist GRO merged segments with
2-byte headroom, software tunnel GSO):
- unpatched: KASAN slab-use-after-free write of size 2 in
skb_udp_tunnel_segment+0x1360, then skb_under_panic
len:-64444 put:-65522, panic;
- with this patch: 149 GSO frames over 150 s, all ~4.8k
segments correctly forwarded, zero KASAN reports, no panic,
system stays up.
Tested-by: Henry Martin <bsdhenrymartin@gmail.com>
next prev parent reply other threads:[~2026-11-04 3:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-01 16:42 [PATCH net v4 0/4] ipmr: forward GSO multicast packets Julius Bairaktaris
2026-11-01 16:42 ` [PATCH net v4 1/4] net: make room for the tunnel header in skb_segment_list() Julius Bairaktaris
2026-11-03 12:43 ` Simon Horman
2026-11-03 13:05 ` Eric Dumazet
2026-11-04 3:42 ` Henry Martin [this message]
2026-11-01 16:42 ` [PATCH net v4 2/4] net: gso: count the inner UDP header of encapsulated UDP GSO packets Julius Bairaktaris
2026-11-03 12:44 ` Simon Horman
2026-11-03 13:08 ` Eric Dumazet
2026-11-01 16:42 ` [PATCH net v4 3/4] ipmr: set up GSO state for tunnel vifs Julius Bairaktaris
2026-11-03 12:44 ` Simon Horman
2026-11-03 13:13 ` Eric Dumazet
2026-11-01 16:42 ` [PATCH net v4 4/4] ipmr: do not drop GSO packets that fit the MTU after segmentation Julius Bairaktaris
2026-11-03 12:44 ` Simon Horman
2026-11-03 13:15 ` Eric Dumazet
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