linux-kernel - Re: [RFC PATCH] procfs: Add file path and size to /proc/<pid>/fdinfo

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Message-ID: <202205191848.DEE05F6@keescook>
Date:   Thu, 19 May 2022 18:49:59 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Kalesh Singh <kaleshsingh@...gle.com>
Cc:     ilkos@...gle.com, tjmercier@...gle.com, surenb@...gle.com,
        kernel-team@...roid.com, Jonathan Corbet <corbet@....net>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Anton Mitterer <mail@...istoph.anton.mitterer.name>,
        Mike Rapoport <rppt@...nel.org>,
        Colin Cross <ccross@...gle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [RFC PATCH] procfs: Add file path and size to /proc/<pid>/fdinfo

On Thu, May 19, 2022 at 02:40:15PM -0700, Kalesh Singh wrote:
> [...]
> +	seq_file_path(m, file, "\n");
> +	seq_putc(m, '\n');
>  
>  	/* show_fd_locks() never deferences files so a stale value is safe */
>  	show_fd_locks(m, file, files);

This comment implies "file" might be stale? Does that mean anything for
the above seq_file_path()?

-- 
Kees Cook