linux-kernel - Re: [PATCH v2] vfs: shave work on failed file open

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Message-ID: <20230928-themen-dilettanten-16bf329ab370@brauner>
Date:   Thu, 28 Sep 2023 16:05:08 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Jann Horn <jannh@...gle.com>
Cc:     Mateusz Guzik <mjguzik@...il.com>, viro@...iv.linux.org.uk,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2] vfs: shave work on failed file open

> So I spent a good chunk of time going through this patch.

The main thing that makes me go "we shouldn't do this" is that KASAN
isn't able to detect UAF issues as Jann pointed out so I'm getting
really nervous about this.

And Jann also pointed out some potential issues with
__fget_files_rcu() as well...