linux-kernel - Re: [PATCH RESEND v5 0/5] namei: vfs flags to restrict path resolution

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Date:   Tue, 23 Apr 2019 22:24:06 +0200
From:   Christian Brauner <christian@...uner.io>
To:     Kees Cook <keescook@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Cc:     Aleksa Sarai <cyphar@...har.com>,
        Andy Lutomirski <luto@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jeff Layton <jlayton@...nel.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Jann Horn <jannh@...gle.com>,
        David Drysdale <drysdale@...gle.com>,
        Tycho Andersen <tycho@...ho.ws>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Chanho Min <chanho.min@....com>,
        Oleg Nesterov <oleg@...hat.com>, Aleksa Sarai <asarai@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH RESEND v5 0/5] namei: vfs flags to restrict path
 resolution

On Tue, Apr 23, 2019 at 01:13:52PM -0700, Kees Cook wrote:
> On Mon, Mar 25, 2019 at 6:05 AM Aleksa Sarai <cyphar@...har.com> wrote:
> >
> > On 2019-03-21, Andy Lutomirski <luto@...nel.org> wrote:
> > > On Wed, Mar 20, 2019 at 7:38 AM Aleksa Sarai <cyphar@...har.com> wrote:
> > > > Now that the holiday break is over, it's time to re-send this patch
> > > > series (with a few additions, due to new information we got from
> > > > CVE-2019-5736 -- which this patchset mostly protected against but had
> > > > some holes with regards to #!-style scripts).
> > >
> > > I generally like this, but, as Linus pointed out, it will be
> > > unfortunate if application authors see this as just another
> > > non-portable weird Linux API and don't use it.  Would it be worthwhile
> > > to put some thought into making it an API that other OSes might be
> > > willing to implement?  As it stands, the openat(2) flags are getting
> > > rather crazy in this patch set.
> 
> I think many of the issues are specific to Linux (and Linux containers
> especially), so I'm not sure this should get blocked because we want
> something more portable.
> 
> This series provides solutions to so many different race and confusion
> issues, I'd really like to see it land. What's the next step here? Is
> this planned to go directly to Linus for v5.2, or is it going to live
> in -mm for a while? I'd really like to see this moving forward.

Yeah, it would be good to move this forward. But since this is pretty
much core-vfs we really need Al to take a look at this.

Christian