linux-kernel - Re: [PATCH RFC 0/1] mount: universally disallow mounting over symlinks

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Message-ID: <20200101234009.GB8904@ZenIV.linux.org.uk>
Date:   Wed, 1 Jan 2020 23:40:09 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Aleksa Sarai <cyphar@...har.com>
Cc:     David Howells <dhowells@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        stable@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        Serge Hallyn <serge@...lyn.com>, dev@...ncontainers.org,
        containers@...ts.linux-foundation.org, linux-api@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/1] mount: universally disallow mounting over
 symlinks

On Thu, Jan 02, 2020 at 01:44:07AM +1100, Aleksa Sarai wrote:

> Thanks, this fixes the issue for me (and also fixes another reproducer I
> found -- mounting a symlink on top of itself then trying to umount it).
> 
> Reported-by: Aleksa Sarai <cyphar@...har.com>
> Tested-by: Aleksa Sarai <cyphar@...har.com>

Pushed into #fixes.

> As for the original topic of bind-mounting symlinks -- given this is a
> supported feature, would you be okay with me sending an updated
> O_EMPTYPATH series?

Post it on fsdevel; I'll need to reread it anyway to say anything useful...