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

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Date:   Tue, 12 Jun 2018 20:56:30 +1000
From:   Balbir Singh <bsingharora@...il.com>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>, 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 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.