netdev - Re: [PATCH net v3] net: do not leave a dangling sk pointer, when socket creation fails

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Date: Thu, 20 Jun 2024 09:20:28 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Ignat Korchagin <ignat@...udflare.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, revest@...omium.org,
 kernel-team@...udflare.com, kuniyu@...zon.com, stable@...r.kernel.org
Subject: Re: [PATCH net v3] net: do not leave a dangling sk pointer,
 when socket creation fails

Hello:

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

On Mon, 17 Jun 2024 22:02:05 +0100 you wrote:
> It is possible to trigger a use-after-free by:
>   * attaching an fentry probe to __sock_release() and the probe calling the
>     bpf_get_socket_cookie() helper
>   * running traceroute -I 1.1.1.1 on a freshly booted VM
> 
> A KASAN enabled kernel will log something like below (decoded and stripped):
> ==================================================================
> BUG: KASAN: slab-use-after-free in __sock_gen_cookie (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-instrumented.h:1611 net/core/sock_diag.c:29)
> Read of size 8 at addr ffff888007110dd8 by task traceroute/299
> 
> [...]

Here is the summary with links:
  - [net,v3] net: do not leave a dangling sk pointer, when socket creation fails
    https://git.kernel.org/netdev/net/c/6cd4a78d962b

You are awesome, thank you!
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