Subject: Re: [PATCH] bpf/selftests: Fix namespace mount setup in tc_redirect

From: [email-masked]
Date: Wed, 05 Jan 2022 12:40:16 +0000

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <[email-masked]>:

On Tue,  4 Jan 2022 13:10:30 +0100 you wrote:
> The tc_redirect umounts /sys in the new namespace, which can be
> mounted as shared and cause global umount. The lazy umount also
> takes down mounted trees under /sys like debugfs, which won't be
> available after sysfs mounts again and could cause fails in other
> tests.
> 
>   # cat /proc/self/mountinfo | grep debugfs
>   34 23 0:7 / /sys/kernel/debug rw,nosuid,nodev,noexec,relatime shared:14 - debugfs debugfs rw
>   # cat /proc/self/mountinfo | grep sysfs
>   23 86 0:22 / /sys rw,nosuid,nodev,noexec,relatime shared:2 - sysfs sysfs rw
>   # mount | grep debugfs
>   debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
> 
> [...]

Here is the summary with links:
  - bpf/selftests: Fix namespace mount setup in tc_redirect
    https://git.kernel.org/bpf/bpf-next/c/5e22dd186267

You are awesome, thank you!
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