linux-hardening - Re: BTI interaction between seccomp filters in systemd and glibc mprotect calls, causing service failures

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Message-ID: <20201026165125.GF7402@sirena.org.uk>
Date:   Mon, 26 Oct 2020 16:51:25 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Dave Martin <Dave.Martin@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Topi Miettinen <toiwoton@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Salvatore Mesoraca <s.mesoraca16@...il.com>,
        systemd-devel@...ts.freedesktop.org,
        Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com,
        Will Deacon <will.deacon@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        linux-hardening@...r.kernel.org, libc-alpha@...rceware.org,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: BTI interaction between seccomp filters in systemd and glibc
 mprotect calls, causing service failures

On Mon, Oct 26, 2020 at 03:56:35PM +0000, Dave Martin wrote:
> On Mon, Oct 26, 2020 at 02:52:46PM +0000, Catalin Marinas via Libc-alpha wrote:

> > Now, if the dynamic loader silently ignores the mprotect() failure on
> > the main executable, is there much value in exposing a flag in the aux
> > vectors? It saves a few (one?) mprotect() calls but I don't think it
> > matters much. Anyway, I don't mind the flag.

> I don't see a problem with the aforementioned patch [2] to pre-set BTI
> on the pages of the main binary.

Me either FWIW.

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