linux-kernel - Re: [PATCH] bpf: task_group_seq_get_next: cleanup the usage of next

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Message-ID: <20230825135041.GB29260@redhat.com>
Date:   Fri, 25 Aug 2023 15:50:42 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Yonghong Song <yhs@...com>, Kui-Feng Lee <kuifeng@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...nel.org>,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpf: task_group_seq_get_next: cleanup the usage of
 next_thread()

On 08/25, Eric W. Biederman wrote:
>
> For the record I find this code confusing, and wrong.

Oh, yes...

> and has
> a built in race condition which means it could wind up iterating through
> a different process.

Yes, common->pid and/or common->pid_visiting can be reused

but I am not going to try to fix this ;)

> Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Thanks!

Oleg.