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Date: Wed, 9 Sep 2020 19:56:20 +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>,
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Dmitry Vyukov <dvyukov@...gle.com>, Eric Biggers <ebiggers@...nel.org>,
Eric Chiang <ericchiang@...gle.com>, Florian Weimer <fweimer@...hat.com>,
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Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
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linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH v8 0/3] Add support for AT_INTERPRETED (was O_MAYEXEC)
On 09/09/2020 19:13, Al Viro wrote:
> On Wed, Sep 09, 2020 at 09:19:11AM +0200, Mickaël Salaün wrote:
>>
>> 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.
>
> Once more, with feeling: don't hide that behind existing syscalls.
> If you want to tell LSM have a look at given fs object in a special
> way, *add* *a* *new* *system* *call* *for* *doing* *just* *that*.
>
Fine, I'll do it. It will look a lot like this one though.
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