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Message-ID: <cf07f0732eb94dbfa67c9d56ceba738e@AcuMS.aculab.com>
Date: Tue, 2 Feb 2021 09:23:54 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Andy Lutomirski' <luto@...nel.org>, "Jason A. Donenfeld"
<Jason@...c4.com>
CC: Kernel Hardening <kernel-hardening@...ts.openwall.com>, LKML
<linux-kernel@...r.kernel.org>, Jann Horn <jann@...jh.net>, Christian Brauner
<christian.brauner@...onical.com>
Subject: RE: forkat(int pidfd), execveat(int pidfd), other awful things?
From: Andy Lutomirski
> Sent: 01 February 2021 18:30
...
> 2. A sane process creation API. It would be delightful to be able to
> create a fully-specified process without forking. This might end up
> being a fairly complicated project, though -- there are a lot of
> inherited process properties to be enumerated.
Since you are going to (eventually) load in a program image
have to do several system calls to create the process isn't
likely to be a problem.
So using separate calls for each property isn't really an issue
and solves the horrid problem of the API structure.
So you could create an embryonic process that inherits a lot
of stuff from the current process, the do actions that
sort out the fds, argv, namespace etc.
Finally running the new program.
It would probably make implement posix_spawn() easier.
David
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