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Date:   Thu, 14 Jan 2021 04:21:44 +0100
From:   Jann Horn <>
To:     Mickaël Salaün <>
Cc:     James Morris <>,
        "Serge E . Hallyn" <>,
        Al Viro <>,
        Andy Lutomirski <>,
        Anton Ivanov <>,
        Arnd Bergmann <>,
        Casey Schaufler <>,
        Jeff Dike <>,
        Jonathan Corbet <>,
        Kees Cook <>,
        Michael Kerrisk <>,
        Richard Weinberger <>,
        Shuah Khan <>,
        Vincent Dagonneau <>,
        Kernel Hardening <>,
        Linux API <>,
        linux-arch <>,
        "open list:DOCUMENTATION" <>,
        linux-fsdevel <>,
        kernel list <>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        linux-security-module <>,
        "the arch/x86 maintainers" <>,
        Mickaël Salaün <>
Subject: Re: [PATCH v26 02/12] landlock: Add ruleset and domain management

On Wed, Dec 9, 2020 at 8:28 PM Mickaël Salaün <> 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 <>
> Cc: Jann Horn <>
> Cc: Kees Cook <>
> Cc: Serge E. Hallyn <>
> Signed-off-by: Mickaël Salaün <>

Yeah, the layer stack stuff in this version looks good to me. :)

Reviewed-by: Jann Horn <>

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