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Date: Sun, 10 Oct 2021 14:48:14 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Al Viro <viro@...iv.linux.org.uk>,
Aleksa Sarai <cyphar@...har.com>,
Andy Lutomirski <luto@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
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Christian Heimes <christian@...hon.org>,
Deven Bowers <deven.desai@...ux.microsoft.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
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Eric Chiang <ericchiang@...gle.com>,
Florian Weimer <fweimer@...hat.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
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Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
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Philippe Trébuchet
<philippe.trebuchet@....gouv.fr>,
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Subject: Re: [PATCH v14 0/3] Add trusted_for(2) (was O_MAYEXEC)
On Fri, 8 Oct 2021 12:48:37 +0200 Mickaël Salaün <mic@...ikod.net> wrote:
> The final goal of this patch series is to enable the kernel to be a
> global policy manager by entrusting processes with access control at
> their level. To reach this goal, two complementary parts are required:
> * user space needs to be able to know if it can trust some file
> descriptor content for a specific usage;
> * and the kernel needs to make available some part of the policy
> configured by the system administrator.
Apologies if I missed this...
It would be nice to see a description of the proposed syscall interface
in these changelogs! Then a few questions I have will be answered...
long trusted_for(const int fd,
const enum trusted_for_usage usage,
const u32 flags)
- `usage' must be equal to TRUSTED_FOR_EXECUTION, so why does it
exist? Some future modes are planned? Please expand on this.
- `flags' is unused (must be zero). So why does it exist? What are
the plans here?
- what values does the syscall return and what do they mean?
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