linux-kernel - Re: [PATCH net v2] ipv4: Fix uninit-value access in __ip_make

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Date: Thu, 02 May 2024 08:20:29 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Shigeru Yoshida <syoshida@...hat.com>
Cc: davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, syzkaller@...glegroups.com
Subject: Re: [PATCH net v2] ipv4: Fix uninit-value access in __ip_make_skb()

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@...hat.com>:

On Tue, 30 Apr 2024 21:39:45 +0900 you wrote:
> KMSAN reported uninit-value access in __ip_make_skb() [1].  __ip_make_skb()
> tests HDRINCL to know if the skb has icmphdr. However, HDRINCL can cause a
> race condition. If calling setsockopt(2) with IP_HDRINCL changes HDRINCL
> while __ip_make_skb() is running, the function will access icmphdr in the
> skb even if it is not included. This causes the issue reported by KMSAN.
> 
> Check FLOWI_FLAG_KNOWN_NH on fl4->flowi4_flags instead of testing HDRINCL
> on the socket.
> 
> [...]

Here is the summary with links:
  - [net,v2] ipv4: Fix uninit-value access in __ip_make_skb()
    https://git.kernel.org/netdev/net/c/fc1092f51567

You are awesome, thank you!
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