linux-kernel - Re: [PATCH 3/8] seccomp: Introduce SECCOMP_PIN

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Date:   Wed, 17 Jun 2020 17:31:59 +0200
From:   Jann Horn <jannh@...gle.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Will Drewry <wad@...omium.org>,
        Christian Brauner <christian@...uner.io>,
        Sargun Dhillon <sargun@...gun.me>,
        Tycho Andersen <tycho@...ho.ws>,
        "zhujianwei (C)" <zhujianwei7@...wei.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Shuah Khan <shuah@...nel.org>,
        Matt Denton <mpdenton@...gle.com>,
        Chris Palmer <palmer@...gle.com>,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Hehuazhen <hehuazhen@...wei.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH 3/8] seccomp: Introduce SECCOMP_PIN_ARCHITECTURE

On Wed, Jun 17, 2020 at 5:30 PM Andy Lutomirski <luto@...nel.org> wrote:
>
> On Wed, Jun 17, 2020 at 8:25 AM Jann Horn <jannh@...gle.com> wrote:
> >
> > On Tue, Jun 16, 2020 at 9:49 AM Kees Cook <keescook@...omium.org> wrote:
> > > For systems that provide multiple syscall maps based on architectures
> > > (e.g. AUDIT_ARCH_X86_64 and AUDIT_ARCH_I386 via CONFIG_COMPAT), allow
> > > a fast way to pin the process to a specific syscall mapping, instead of
> > > needing to generate all filters with an architecture check as the first
> > > filter action.
> >
> > This seems reasonable; but can we maybe also add X86-specific handling
> > for that X32 mess? AFAIK there are four ways to do syscalls with
> > AUDIT_ARCH_X86_64:
>
> You're out of date :)  I fixed the mess.
>
> commit 6365b842aae4490ebfafadfc6bb27a6d3cc54757
> Author: Andy Lutomirski <luto@...nel.org>
> Date:   Wed Jul 3 13:34:04 2019 -0700
>
>     x86/syscalls: Split the x32 syscalls into their own table

Oooooh, beautiful. Thank you very much for that.