linux-kernel - Re: [RFC PATCH 06/27] containers, vfs: Allow syscall dirfd arguments to take a container fd

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Message-ID: <20784.1550618661@warthog.procyon.org.uk>
Date:   Tue, 19 Feb 2019 23:24:21 +0000
From:   David Howells <dhowells@...hat.com>
To:     ebiederm@...ssion.com (Eric W. Biederman)
Cc:     dhowells@...hat.com, keyrings@...r.kernel.org,
        trond.myklebust@...merspace.com, sfrench@...ba.org,
        linux-security-module@...r.kernel.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        rgb@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 06/27] containers, vfs: Allow syscall dirfd arguments to take a container fd

Eric W. Biederman <ebiederm@...ssion.com> wrote:

> In fact if you take care to use a path that starts with '/' the normal
> dirfd based operations work just fine.

If the path starts with '/', dirfd is ignored.  And there's an error in my
patch description - it should be:

 	mkdirat(cfd, "fred", 0755);

David