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Message-Id: <1544699060.6703.11.camel@linux.ibm.com>
Date: Thu, 13 Dec 2018 06:04:20 -0500
From: Mimi Zohar <zohar@...ux.ibm.com>
To: Matthew Wilcox <willy@...radead.org>,
Mickaël Salaün <mic@...ikod.net>
Cc: linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
James
Morris <jmorris@...ei.org>, Jonathan Corbet <corbet@....net>,
Kees Cook
<keescook@...omium.org>, Matthew Garrett <mjg59@...gle.com>,
Michael
Kerrisk <mtk.manpages@...il.com>,
Mickaël Salaün
<mickael.salaun@....gouv.fr>,
Philippe Trébuchet
<philippe.trebuchet@....gouv.fr>,
Shuah Khan <shuah@...nel.org>,
Thibaut
Sautereau <thibaut.sautereau@....gouv.fr>,
Vincent Strubel
<vincent.strubel@....gouv.fr>,
Yves-Alexis Perez
<yves-alexis.perez@....gouv.fr>,
kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
linux-security-module@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH v1 0/5] Add support for O_MAYEXEC
On Wed, 2018-12-12 at 19:02 -0800, Matthew Wilcox wrote:
> On Wed, Dec 12, 2018 at 09:17:07AM +0100, Mickaël Salaün wrote:
> > The goal of this patch series is to control script interpretation. A
> > new O_MAYEXEC flag used by sys_open() is added to enable userland script
> > interpreter to delegate to the kernel (and thus the system security
> > policy) the permission to interpret scripts or other files containing
> > what can be seen as commands.
>
> I don't have a problem with the concept, but we're running low on O_ bits.
> Does this have to be done before the process gets a file descriptor,
> or could we have a new syscall? Since we're going to be changing the
> interpreters anyway, it doesn't seem like too much of an imposition to
> ask them to use:
>
> int verify_for_exec(int fd)
>
> instead of adding an O_MAYEXEC.
The indication needs to be set during file open, before the open
returns to the caller. This is the point where ima_file_check()
verifies the file's signature. On failure, access to the file is
denied.
Mimi
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