The EFI spec v2.10 introduces a global flag in the memory attributes table that indicates whether the EFI runtime code regions were emitted with BTI landing pads, and can therefore tolerate being mapped with BTI enforcement enabled. Add the generic plumbing for this, and wire it up for arm64. Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Ard Biesheuvel (2): efi: Discover BTI support in runtime services regions efi: arm64: Wire up BTI annotation in memory attributes table arch/arm/include/asm/efi.h | 2 +- arch/arm/kernel/efi.c | 5 +++-- arch/arm64/include/asm/efi.h | 3 ++- arch/arm64/kernel/efi.c | 18 +++++++++++++++--- arch/riscv/include/asm/efi.h | 2 +- arch/riscv/kernel/efi.c | 3 ++- arch/x86/platform/efi/efi_64.c | 3 ++- drivers/firmware/efi/memattr.c | 9 +++++++-- include/linux/efi.h | 8 ++++++-- 9 files changed, 39 insertions(+), 14 deletions(-) -- 2.39.0
