linux-kernel - Re: [PATCH] bpf: skip task with pid=1 in send_signal

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Message-Id: <167304241732.27890.12549455955282879496.git-patchwork-notify@kernel.org>
Date:   Fri, 06 Jan 2023 22:00:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Hao Sun <sunhao.th@...il.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        john.fastabend@...il.com, andrii@...nel.org, martin.lau@...ux.dev,
        song@...nel.org, yhs@...com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpf: skip task with pid=1 in send_signal_common()

Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Fri,  6 Jan 2023 16:48:38 +0800 you wrote:
> The following kernel panic can be triggered when a task with pid=1
> attach a prog that attempts to send killing signal to itself, also
> see [1] for more details:
> 
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> CPU: 3 PID: 1 Comm: systemd Not tainted 6.1.0-09652-g59fe41b5255f #148
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0x100/0x178 lib/dump_stack.c:106
> panic+0x2c4/0x60f kernel/panic.c:275
> do_exit.cold+0x63/0xe4 kernel/exit.c:789
> do_group_exit+0xd4/0x2a0 kernel/exit.c:950
> get_signal+0x2460/0x2600 kernel/signal.c:2858
> arch_do_signal_or_restart+0x78/0x5d0 arch/x86/kernel/signal.c:306
> exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
> exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
> __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
> syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
> do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> [...]

Here is the summary with links:
  - bpf: skip task with pid=1 in send_signal_common()
    https://git.kernel.org/bpf/bpf/c/a3d81bc1eaef

You are awesome, thank you!
-- 
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