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From: patchwork-bot+netdevbpf@kernel.org
To: Pu Lehui <pulehui@huaweicloud.com>
Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
	ast@kernel.org, houtao@huaweicloud.com, leon.hwang@linux.dev,
	daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com,
	memxor@gmail.com, martin.lau@linux.dev, yonghong.song@linux.dev,
	song@kernel.org, jolsa@kernel.org, emil@etsalapatis.com,
	ihor.solodrai@linux.dev, pulehui@huawei.com
Subject: Re: [PATCH bpf v4] bpf: Fix UAF due to concurrent consumption of ttrace lists in alloc_bulk
Date: Mon, 14 Sep 2026 02:50:04 +0000	[thread overview]
Message-ID: <178935420415.291206.2678079383143049504.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260905021139.4116529-1-pulehui@huaweicloud.com>

Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Sat,  5 Sep 2026 02:11:39 +0000 you wrote:
> From: Pu Lehui <pulehui@huawei.com>
> 
> Syzkaller repeatedly triggered UAF splats related to nodes in
> waiting_for_gp_ttrace within the bpf memalloc:
> 
> BUG: KASAN: slab-use-after-free in llist_del_first+0x85/0x110 lib/llist.c:61
> Read of size 8 at addr ffff8881572cd080 by task syz.4.470/5112
>  ...
>  llist_del_first+0x85/0x110 lib/llist.c:61
>  alloc_bulk+0x193/0x460 kernel/bpf/memalloc.c:229
>  bpf_mem_refill+0x386/0x560 kernel/bpf/memalloc.c:436
> 
> [...]

Here is the summary with links:
  - [bpf,v4] bpf: Fix UAF due to concurrent consumption of ttrace lists in alloc_bulk
    https://git.kernel.org/bpf/bpf/c/1c21452d02ee

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



      parent reply	other threads:[~2026-09-14  2:51 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-05  2:11 [PATCH bpf v4] bpf: Fix UAF due to concurrent consumption of ttrace lists in alloc_bulk Pu Lehui
2026-09-05  3:00 ` bot+bpf-ci
2026-09-05  3:57   ` Pu Lehui
2026-09-07  2:40 ` Hou Tao
2026-09-11  1:17 ` Pu Lehui
2026-09-11 15:29   ` Alexei Starovoitov
2026-09-14  2:48 ` Alexei Starovoitov
2026-09-14  2:50 ` patchwork-bot+netdevbpf [this message]

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