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Message-ID: <e3223b50-0d00-3b64-1e09-cfb1b9648b02@digikod.net>
Date: Wed, 9 Sep 2020 09:19:11 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: linux-kernel@...r.kernel.org, Aleksa Sarai <cyphar@...har.com>,
 Alexei Starovoitov <ast@...nel.org>,
 Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski
 <luto@...nel.org>, Christian Brauner <christian.brauner@...ntu.com>,
 Christian Heimes <christian@...hon.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 Deven Bowers <deven.desai@...ux.microsoft.com>,
 Dmitry Vyukov <dvyukov@...gle.com>, Eric Biggers <ebiggers@...nel.org>,
 Eric Chiang <ericchiang@...gle.com>, Florian Weimer <fweimer@...hat.com>,
 James Morris <jmorris@...ei.org>, Jan Kara <jack@...e.cz>,
 Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>,
 Kees Cook <keescook@...omium.org>,
 Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
 Matthew Garrett <mjg59@...gle.com>, Matthew Wilcox <willy@...radead.org>,
 Michael Kerrisk <mtk.manpages@...il.com>,
 Miklos Szeredi <mszeredi@...hat.com>, Mimi Zohar <zohar@...ux.ibm.com>,
 Philippe Trébuchet <philippe.trebuchet@....gouv.fr>,
 Scott Shell <scottsh@...rosoft.com>,
 Sean Christopherson <sean.j.christopherson@...el.com>,
 Shuah Khan <shuah@...nel.org>, Steve Dower <steve.dower@...hon.org>,
 Steve Grubb <sgrubb@...hat.com>,
 Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
 Thibaut Sautereau <thibaut.sautereau@...p-os.org>,
 Vincent Strubel <vincent.strubel@....gouv.fr>,
 kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
 linux-integrity@...r.kernel.org, linux-security-module@...r.kernel.org,
 linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH v8 0/3] Add support for AT_INTERPRETED (was O_MAYEXEC)


On 08/09/2020 20:50, Al Viro wrote:
> On Tue, Sep 08, 2020 at 09:59:53AM +0200, Mickaël Salaün wrote:
>> Hi,
>>
>> This height patch series rework the previous O_MAYEXEC series by not
>> adding a new flag to openat2(2) but to faccessat2(2) instead.  As
>> suggested, this enables to perform the access check on a file descriptor
>> instead of on a file path (while opening it).  This may require two
>> checks (one on open and then with faccessat2) but it is a more generic
>> approach [8].
> 
> Again, why is that folded into lookup/open/whatnot, rather than being
> an operation applied to a file (e.g. O_PATH one)?
> 

I don't understand your question. AT_INTERPRETED can and should be used
with AT_EMPTY_PATH. The two checks I wrote about was for IMA.

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