linux-kernel - Re: [PATCH 00/10] Control Flow Enforcement

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Message-ID: <1528815820.8271.16.camel@2b52.sc.intel.com>
Date:   Tue, 12 Jun 2018 08:03:40 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Balbir Singh <bsingharora@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-arch@...r.kernel.org, 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>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        Jonathan Corbet <corbet@....net>,
        Oleg Nesterov <oleg@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH 00/10] Control Flow Enforcement - Part (3)

On Tue, 2018-06-12 at 20:56 +1000, Balbir Singh wrote:
> 
> On 08/06/18 00:37, Yu-cheng Yu wrote:
> > This series introduces CET - Shadow stack
> > 
> > At the high level, shadow stack is:
> > 
> > 	Allocated from a task's address space with vm_flags VM_SHSTK;
> > 	Its PTEs must be read-only and dirty;
> > 	Fixed sized, but the default size can be changed by sys admin.
> > 
> > For a forked child, the shadow stack is duplicated when the next
> > shadow stack access takes place.
> > 
> > For a pthread child, a new shadow stack is allocated.
> > 
> > The signal handler uses the same shadow stack as the main program.
> > 
> 
> Even with sigaltstack()?
> 
> 
> Balbir Singh.

Yes.