From: James Morris <jmorris@namei.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Mickaël Salaün" <mic@digikod.net>,
"Mimi Zohar" <zohar@linux.ibm.com>,
linux-kernel@vger.kernel.org, "Aleksa Sarai" <cyphar@cyphar.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Andy Lutomirski" <luto@kernel.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Casey Schaufler" <casey@schaufler-ca.com>,
"Christian Brauner" <christian.brauner@ubuntu.com>,
"Christian Heimes" <christian@python.org>,
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"Vincent Strubel" <vincent.strubel@ssi.gouv.fr>,
kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [RFC PATCH v9 0/3] Add introspect_access(2) (was O_MAYEXEC)
Date: Sat, 12 Sep 2020 10:28:52 +1000 (AEST) [thread overview]
Message-ID: <alpine.LRH.2.21.2009121019050.17638@namei.org> (raw)
In-Reply-To: <20200910184033.GX6583@casper.infradead.org>
[-- Attachment #1: Type: text/plain, Size: 872 bytes --]
On Thu, 10 Sep 2020, Matthew Wilcox wrote:
> On Thu, Sep 10, 2020 at 08:38:21PM +0200, Mickaël Salaün wrote:
> > There is also the use case of noexec mounts and file permissions. From
> > user space point of view, it doesn't matter which kernel component is in
> > charge of defining the policy. The syscall should then not be tied with
> > a verification/integrity/signature/appraisal vocabulary, but simply an
> > access control one.
>
> permission()?
>
The caller is not asking the kernel to grant permission, it's asking
"SHOULD I access this file?"
The caller doesn't know, for example, if the script file it's about to
execute has been signed, or if it's from a noexec mount. It's asking the
kernel, which does know. (Note that this could also be extended to reading
configuration files).
How about: should_faccessat ?
--
James Morris
<jmorris@namei.org>
next prev parent reply other threads:[~2020-09-12 0:30 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-10 16:46 [RFC PATCH v9 0/3] Add introspect_access(2) (was O_MAYEXEC) Mickaël Salaün
2020-09-10 17:04 ` Matthew Wilcox
2020-09-10 17:21 ` Mickaël Salaün
2020-09-10 17:47 ` Mickaël Salaün
2020-09-10 18:08 ` Mimi Zohar
2020-09-10 18:38 ` Mickaël Salaün
2020-09-10 18:40 ` Matthew Wilcox
2020-09-10 20:00 ` Al Viro
2020-09-10 20:05 ` Matthew Wilcox
2020-09-11 12:16 ` Mickaël Salaün
2020-09-11 14:15 ` Igor Zhbanov
2020-09-12 0:28 ` James Morris [this message]
2020-09-14 16:43 ` Mickaël Salaün
[not found] ` <20200910164612.114215-3-mic@digikod.net>
2020-09-15 13:32 ` [RFC PATCH v9 2/3] arch: Wire up introspect_access(2) Arnd Bergmann
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