Re: [RFC PATCH v8 0/3] Add support for AT_INTERPRETED (was O_MAYEXEC)
From: Matthew Wilcox <willy@infradead.org>
Date: 2020-09-09 17:09:21
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linux-fsdevel, linux-integrity, linux-security-module, lkml
On Wed, Sep 09, 2020 at 09:19:11AM +0200, Mickaël Salaün wrote:
On 08/09/2020 20:50, Al Viro wrote:quoted
On Tue, Sep 08, 2020 at 09:59:53AM +0200, Mickaël Salaün wrote:quoted
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.
Al is saying you should add a new syscall, not try to fold it into some existing syscall. I agree with him. Add a new syscall, just like you were told to do it last time.