Re: [PATCH net] net: af_key: zero aligned sockaddr tail in PF_KEY exports

[Steffen Klassert <steffen.klassert@secunet.com>]

On Sun, Mar 22, 2026 at 11:46:08AM -0700, Zhengchuan Liang wrote:
> PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr
> payload space, so IPv6 addresses occupy 32 bytes on the wire. However,
> `pfkey_sockaddr_fill()` initializes only the first 28 bytes of
> `struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized.
> 
> Not every PF_KEY message is affected. The state and policy dump builders
> already zero the whole message buffer before filling the sockaddr
> payloads. Keep the fix to the export paths that still append aligned
> sockaddr payloads with plain `skb_put()`:
> 
>   - `SADB_ACQUIRE`
>   - `SADB_X_NAT_T_NEW_MAPPING`
>   - `SADB_X_MIGRATE`
> 
> Fix those paths by clearing only the aligned sockaddr tail after
> `pfkey_sockaddr_fill()`.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Fixes: 08de61beab8a ("[PFKEYV2]: Extension for dynamic update of endpoint address(es)")
> Reported-by: Yifan Wu <yifanwucs@gmail.com>
> Reported-by: Juefei Pu <tomapufckgml@gmail.com>
> Co-developed-by: Yuan Tan <yuantan098@gmail.com>
> Signed-off-by: Yuan Tan <yuantan098@gmail.com>
> Suggested-by: Xin Liu <bird@lzu.edu.cn>
> Tested-by: Xiao Liu <lx24@stu.ynu.edu.cn>
> Signed-off-by: Zhengchuan Liang <zcliangcn@gmail.com>

Applied, thanks a lot!