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Message-ID: <87r0c3dc1c.fsf@oldenburg.str.redhat.com>
Date: Mon, 08 Jul 2024 19:33:03 +0200
From: Florian Weimer <fweimer@...hat.com>
To: Jeff Xu <jeffxu@...gle.com>
Cc: Mickaël Salaün <mic@...ikod.net>,  Al Viro
 <viro@...iv.linux.org.uk>,
  Christian Brauner <brauner@...nel.org>,  Kees Cook
 <keescook@...omium.org>,  Linus Torvalds <torvalds@...ux-foundation.org>,
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 <thibaut.sautereau@....gouv.fr>,  Vincent Strubel
 <vincent.strubel@....gouv.fr>,  Xiaoming Ni <nixiaoming@...wei.com>,  Yin
 Fengwei <fengwei.yin@...el.com>,  kernel-hardening@...ts.openwall.com,
  linux-api@...r.kernel.org,  linux-fsdevel@...r.kernel.org,
  linux-integrity@...r.kernel.org,  linux-kernel@...r.kernel.org,
  linux-security-module@...r.kernel.org
Subject: Re: [RFC PATCH v19 1/5] exec: Add a new AT_CHECK flag to execveat(2)

* Jeff Xu:

> On Mon, Jul 8, 2024 at 9:26 AM Florian Weimer <fweimer@...hat.com> wrote:
>>
>> * Jeff Xu:
>>
>> > Will dynamic linkers use the execveat(AT_CHECK) to check shared
>> > libraries too ?  or just the main executable itself.
>>
>> I expect that dynamic linkers will have to do this for everything they
>> map.
> Then all the objects (.so, .sh, etc.) will go through  the check from
> execveat's main  to security_bprm_creds_for_exec(), some of them might
> be specific for the main executable ?

If we want to avoid that, we could have an agreed-upon error code which
the LSM can signal that it'll never fail AT_CHECK checks, so we only
have to perform the extra system call once.

Thanks,
Florian


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