Re: [PATCH 5.10.y 1/2] arm64: Always load shadow stack pointer directly from the task struct

[Greg KH <gregkh@linuxfoundation.org>]

On Sat, May 06, 2023 at 02:34:33PM +0200, Ard Biesheuvel wrote:
> All occurrences of the scs_load macro load the value of the shadow call
> stack pointer from the task which is current at that point. So instead
> of taking a task struct register argument in the scs_load macro to
> specify the task struct to load from, let's always reference the current
> task directly. This should make it much harder to exploit any
> instruction sequences reloading the shadow call stack pointer register
> from memory.
> 
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> Acked-by: Mark Rutland <mark.rutland@arm.com>
> Reviewed-by: Kees Cook <keescook@chromium.org>
> Link: https://lore.kernel.org/r/20230109174800.3286265-2-ardb@kernel.org
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> ---
>  arch/arm64/include/asm/scs.h | 7 ++++---
>  arch/arm64/kernel/entry.S    | 4 ++--
>  arch/arm64/kernel/head.S     | 2 +-
>  3 files changed, 7 insertions(+), 6 deletions(-)

What is the git commit id of this in Linus's tree?

thanks,

greg k-h