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Date: Sat, 21 Nov 2020 08:00:00 +0100
From: Jann Horn <jannh@...gle.com>
To: Mickaël Salaün <mic@...ikod.net>
Cc: James Morris <jmorris@...ei.org>, "Serge E . Hallyn" <serge@...lyn.com>,
Al Viro <viro@...iv.linux.org.uk>, Andy Lutomirski <luto@...capital.net>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>, Arnd Bergmann <arnd@...db.de>,
Casey Schaufler <casey@...aufler-ca.com>, Jeff Dike <jdike@...toit.com>,
Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>,
Michael Kerrisk <mtk.manpages@...il.com>, Richard Weinberger <richard@....at>, Shuah Khan <shuah@...nel.org>,
Vincent Dagonneau <vincent.dagonneau@....gouv.fr>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>, Linux API <linux-api@...r.kernel.org>,
linux-arch <linux-arch@...r.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>,
kernel list <linux-kernel@...r.kernel.org>,
"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>,
linux-security-module <linux-security-module@...r.kernel.org>,
"the arch/x86 maintainers" <x86@...nel.org>, Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [PATCH v24 02/12] landlock: Add ruleset and domain management
On Thu, Nov 12, 2020 at 9:51 PM Mickaël Salaün <mic@...ikod.net> wrote:
> A Landlock ruleset is mainly a red-black tree with Landlock rules as
> nodes. This enables quick update and lookup to match a requested
> access, e.g. to a file. A ruleset is usable through a dedicated file
> descriptor (cf. following commit implementing syscalls) which enables a
> process to create and populate a ruleset with new rules.
>
> A domain is a ruleset tied to a set of processes. This group of rules
> defines the security policy enforced on these processes and their future
> children. A domain can transition to a new domain which is the
> intersection of all its constraints and those of a ruleset provided by
> the current process. This modification only impact the current process.
> This means that a process can only gain more constraints (i.e. lose
> accesses) over time.
>
> Cc: James Morris <jmorris@...ei.org>
> Cc: Jann Horn <jannh@...gle.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Serge E. Hallyn <serge@...lyn.com>
> Signed-off-by: Mickaël Salaün <mic@...ux.microsoft.com>
> ---
>
> Changes since v23:
> * Always intersect access rights. Following the filesystem change
> logic, make ruleset updates more consistent by always intersecting
> access rights (boolean AND) instead of combining them (boolean OR) for
> the same layer.
This seems wrong to me. If some software e.g. builds a policy that
allows it to execute specific libraries and to open input files
specified on the command line, and the user then specifies a library
as an input file, this change will make that fail unless the software
explicitly deduplicates the rules.
Userspace will be forced to add extra complexity to work around this.
> This defensive approach could also help avoid user
> space to inadvertently allow multiple access rights for the same
> object (e.g. write and execute access on a path hierarchy) instead of
> dealing with such inconsistency. This can happen when there is no
> deduplication of objects (e.g. paths and underlying inodes) whereas
> they get different access rights with landlock_add_rule(2).
I don't see why that's an issue. If userspace wants to be able to
access the same object in different ways for different purposes, it
should be able to do that, no?
I liked the semantics from the previous version.
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