linux-kernel - Re: [PATCH 03/10] x86/cet: Signal handling for shadow stack

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Date:   Fri, 8 Jun 2018 15:07:50 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Florian Weimer <fweimer@...hat.com>,
        Dmitry Safonov <dsafonov@...tuozzo.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org,
        Linux-MM <linux-mm@...ck.org>,
        linux-arch <linux-arch@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. J. Lu" <hjl.tools@...il.com>,
        "Shanbhogue, Vedvyas" <vedvyas.shanbhogue@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Oleg Nesterov <oleg@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        mike.kravetz@...cle.com
Subject: Re: [PATCH 03/10] x86/cet: Signal handling for shadow stack

On Thu, Jun 07, 2018 at 01:57:03PM -0700, Andy Lutomirski wrote:
...
> >
> > I didn't read the whole series of patches in details
> > yet, hopefully will be able tomorrow. Thanks Andy for
> > CC'ing!
> 
> We have uc_flags.  It might be useful to carve out some of the flag
> space (24 bits?) to indicate something like the *size* of sigcontext
> and teach the kernel that new sigcontext fields should only be parsed
> on sigreturn() if the size is large enough.

Yes, this should do the trick.