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Message-ID: <2531a0e8-5122-867c-ba06-5d2e623a3834@digikod.net>
Date: Tue, 11 Aug 2020 00:47:32 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Al Viro <viro@...iv.linux.org.uk>, David Laight <David.Laight@...lab.com>
Cc: Kees Cook <keescook@...omium.org>,
Andrew Morton <akpm@...ux-foundation.org>,
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Subject: Re: [PATCH v7 0/7] Add support for O_MAYEXEC
On 11/08/2020 00:28, Al Viro wrote:
> On Mon, Aug 10, 2020 at 10:09:09PM +0000, David Laight wrote:
>>> On Mon, Aug 10, 2020 at 10:11:53PM +0200, Mickaël Salaün wrote:
>>>> It seems that there is no more complains nor questions. Do you want me
>>>> to send another series to fix the order of the S-o-b in patch 7?
>>>
>>> There is a major question regarding the API design and the choice of
>>> hooking that stuff on open(). And I have not heard anything resembling
>>> a coherent answer.
>>
>> To me O_MAYEXEC is just the wrong name.
>> The bit would be (something like) O_INTERPRET to indicate
>> what you want to do with the contents.
The properties is "execute permission". This can then be checked by
interpreters or other applications, then the generic O_MAYEXEC name.
>
> ... which does not answer the question - name of constant is the least of
> the worries here. Why the hell is "apply some unspecified checks to
> file" combined with opening it, rather than being an independent primitive
> you apply to an already opened file? Just in case - "'cuz that's how we'd
> done it" does not make a good answer...
>
That is not the case, see
https://lore.kernel.org/lkml/917bb071-8b1a-3ba4-dc16-f8d7b4cc849f@digikod.net/
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