https://github.com/torvalds/linux
Revision 99a63d36cb3ed5ca3aa6fcb64cffbeaf3b0fb164 authored by Florian Westphal on 26 July 2022, 10:42:06 UTC, committed by Florian Westphal on 26 July 2022, 19:12:42 UTC
Domingo Dirutigliano and Nicola Guerrera report kernel panic when
sending nf_queue verdict with 1-byte nfta_payload attribute.

The IP/IPv6 stack pulls the IP(v6) header from the packet after the
input hook.

If user truncates the packet below the header size, this skb_pull() will
result in a malformed skb (skb->len < 0).

Fixes: 7af4cc3fa158 ("[NETFILTER]: Add "nfnetlink_queue" netfilter queue handler over nfnetlink")
Reported-by: Domingo Dirutigliano <pwnzer0tt1@proton.me>
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 parent 9b134b1
History
Tip revision: 99a63d36cb3ed5ca3aa6fcb64cffbeaf3b0fb164 authored by Florian Westphal on 26 July 2022, 10:42:06 UTC
netfilter: nf_queue: do not allow packet truncation below transport header offset
Tip revision: 99a63d3
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.clang-format -rw-r--r-- 19.8 KB
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