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Subject: Re: [PATCH 00/10] Control Flow Enforcement - Part (3)
From:   Yu-cheng Yu <yu-cheng.yu@intel.com>
To:     Balbir Singh <bsingharora@gmail.com>
Cc:     linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-mm@kvack.org, linux-arch@vger.kernel.org, x86@kernel.org,
        "H. Peter Anvin" <hpa@zytor.com>,
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        "H.J. Lu" <hjl.tools@gmail.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
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        Jonathan Corbet <corbet@lwn.net>,
        Oleg Nesterov <oleg@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
        Mike Kravetz <mike.kravetz@oracle.com>
Date:   Tue, 12 Jun 2018 08:03:40 -0700
In-Reply-To: <bbfde1b3-5e1b-80e3-30e8-fd1e46a2ceb1@gmail.com>
References: <20180607143807.3611-1-yu-cheng.yu@intel.com>
         <bbfde1b3-5e1b-80e3-30e8-fd1e46a2ceb1@gmail.com>
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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.