linux-kernel - Re: [PATCH 2/2] security.capability: fix conversions on getxattr

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Message-ID: <CAJfpegv8e5+xn2X8-QrNnu0QJbe=CoK-DWNOdTV9EdrHrJvtEg@mail.gmail.com>
Date:   Thu, 28 Jan 2021 21:38:00 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     "Serge E. Hallyn" <serge@...lyn.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        linux-fsdevel@...r.kernel.org,
        overlayfs <linux-unionfs@...r.kernel.org>,
        LSM <linux-security-module@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: Re: [PATCH 2/2] security.capability: fix conversions on getxattr

On Thu, Jan 28, 2021 at 9:24 PM Eric W. Biederman <ebiederm@...ssion.com> wrote:

> <aside>
> From our previous discussions I would also argue it would be good
> if there was a bypass that skipped all conversions if the reader
> and the filesystem are in the same user namespace.
> </aside>

That's however just an optimization (AFAICS) that only makes sense if
it helps a read world workload.   I'm not convinced that that's the
case.

Thanks,
Miklos