Re: [PATCH v5 27/39] x86/shstk: Add user-mode shadow stack support
From: Kees Cook <hidden>
Date: 2023-01-20 01:05:14
Also in:
linux-arch, linux-doc, linux-mm, lkml
On Thu, Jan 19, 2023 at 01:23:05PM -0800, Rick Edgecombe wrote:
From: Yu-cheng Yu <redacted> 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 <redacted> Tested-by: John Allen <john.allen@amd.com> Signed-off-by: Yu-cheng Yu <redacted>
Reviewed-by: Kees Cook <redacted> -- Kees Cook