Commits on May 21, 2024

1. netfilter: nftables: exthdr: fix 4-byte stack OOB write …

   commit fd94d9dadee58e09b49075240fe83423eb1dcd36 upstream.
   
   If priv->len is a multiple of 4, then dst[len / 4] can write past
   the destination array which leads to stack corruption.
   
   This construct is necessary to clean the remainder of the register
   in case ->len is NOT a multiple of the register size, so make it
   conditional just like nft_payload.c does.
   
   The bug was added in 4.1 cycle and then copied/inherited when
   tcp/sctp and ip option support was added.
   
   Bug reported by Zero Day Initiative project (ZDI-CAN-21950,
   ZDI-CAN-21951, ZDI-CAN-21961).
   
   Fixes: 49499c3 ("netfilter: nf_tables: switch registers to 32 bit addressing")
   Fixes: 935b7f6 ("netfilter: nft_exthdr: add TCP option matching")
   Fixes: 133dc203d77d ("netfilter: nft_exthdr: Support SCTP chunks")
   Fixes: dbb5281a1f84 ("netfilter: nf_tables: add support for matching IPv4 options")
   Signed-off-by: Florian Westphal <fw@strlen.de>
   Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
   Signed-off-by: SeongJae Park <sjpark@amazon.com>

   

   Florian Westphal authored and sj-aws committed May 21, 2024
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