Re: [RFC PATCH v8 0/3] Add support for AT_INTERPRETED (was O_MAYEXEC)

From: Mickaël Salaün
Date: Wed Sep 09 2020 - 03:19:52 EST

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.