linux-hardening - Re: [PATCH] [PATCH,v2,1/1,AARCH64][PR102768] aarch64: Add compiler support for Shadow Call Stack

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Date:   Mon, 6 Dec 2021 11:22:30 +0800
From:   Dan Li <ashimida@...ux.alibaba.com>
To:     gcc-patches@....gnu.org
Cc:     linux-hardening@...r.kernel.org, hp@....gnu.org,
        Nick Desaulniers <ndesaulniers@...gle.com>, nsz@....gnu.org,
        pageexec@...il.com, qinzhao@....gnu.org
Subject: Re: [PATCH] [PATCH,v2,1/1,AARCH64][PR102768] aarch64: Add compiler
 support for Shadow Call Stack



On 12/6/21 10:41 AM, Dan Li wrote:
> Shadow Call Stack can be used to protect the return address of a
> function at runtime, and clang already supports this feature[1].
> 
> To enable SCS in user mode, in addition to compiler, other support
> is also required (as discussed in [2]). This patch only adds basic
> support for SCS from the compiler side, and provides convenience
> for users to enable SCS.
> 
> For linux kernel, only the support of the compiler is required.
> 
> [1] https://clang.llvm.org/docs/ShadowCallStack.html
> [2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102768
> 
> Signed-off-by: Dan Li <ashimida@...ux.alibaba.com>
>
Add more reviewers :)