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@xxxxxxxxxx> > Acked-by: Mark Rutland <mark.rutland@xxxxxxx> > Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> > Link: https://lore.kernel.org/r/20230109174800.3286265-2-ardb@xxxxxxxxxx > Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> > Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx> > --- > 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
