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List:       linux-api
Subject:    Re: [PATCH v5 27/39] x86/shstk: Add user-mode shadow stack support
From:       Kees Cook <keescook () chromium ! org>
Date:       2023-01-20 1:05:04
Message-ID: 202301191705.E64F62342D () keescook
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On Thu, Jan 19, 2023 at 01:23:05PM -0800, Rick Edgecombe wrote:
> From: Yu-cheng Yu <yu-cheng.yu@intel.com>
> 
> Introduce basic shadow stack enabling/disabling/allocation routines.
> A task's shadow stack is allocated from memory with VM_SHADOW_STACK flag
> and has a fixed size of min(RLIMIT_STACK, 4GB).
> 
> Keep the task's shadow stack address and size in thread_struct. This will
> be copied when cloning new threads, but needs to be cleared during exec,
> so add a function to do this.
> 
> Do not support IA32 emulation or x32.
> 
> Tested-by: Pengfei Xu <pengfei.xu@intel.com>
> Tested-by: John Allen <john.allen@amd.com>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook
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