Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Fri, 29 Jan 2021 10:49:32 -0600
From:   Josh Poimboeuf <jpoimboe@redhat.com>
To:     Borislav Petkov <bp@alien8.de>
Cc:     x86@kernel.org, Masami Hiramatsu <masami.hiramatsu@gmail.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Alexei Starovoitov <ast@kernel.org>, bpf@vger.kernel.org,
        Steven Rostedt <rostedt@goodmis.org>,
        Nikolay Borisov <nborisov@suse.com>
Subject: Re: [PATCH] x86: Disable CET instrumentation in the kernel
Message-ID: <20210129164932.qt7hhmb7x4ehomfr@treble>
References: <a35a6f15-9ab1-917c-d443-23d3e78f2d73@suse.com>
 <20210128103415.d90be51ec607bb6123b2843c@kernel.org>
 <20210128123842.c9e33949e62f504b84bfadf5@gmail.com>
 <e8bae974-190b-f247-0d89-6cea4fd4cc39@suse.com>
 <eb1ec6a3-9e11-c769-84a4-228f23dc5e23@suse.com>
 <20210128165014.xc77qtun6fl2qfun@treble>
 <20210128215219.6kct3h2eiustncws@treble>
 <20210129102105.GA27841@zn.tnic>
 <20210129151034.iba4eaa2fuxsipqa@treble>
 <20210129163048.GD27841@zn.tnic>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20210129163048.GD27841@zn.tnic>
Precedence: bulk

On Fri, Jan 29, 2021 at 05:30:48PM +0100, Borislav Petkov wrote:
> On Fri, Jan 29, 2021 at 09:10:34AM -0600, Josh Poimboeuf wrote:
> > Maybe eventually.  But the enablement (actually enabling CET/CFI/etc)
> > happens in the arch code anyway, right?  So it could be a per-arch
> > decision.
> 
> Right.
> 
> Ok, for this one, what about
> 
> Cc: <stable@vger.kernel.org>
> 
> ?
> 
> What are "some configurations of GCC"? If it can be reproduced with
> what's released out there, maybe that should go in now, even for 5.11?
> 
> Hmm?

Agreed, stable is a good idea.   I think Nikolay saw it with GCC 9.

-- 
Josh