From e51f5f56dd69e009e22af8a4354dce0817a7addb Mon Sep 17 00:00:00 2001 From: Amit Daniel Kachhap Date: Fri, 13 Mar 2020 14:35:01 +0530 Subject: arm64: suspend: restore the kernel ptrauth keys This patch restores the kernel keys from current task during cpu resume after the mmu is turned on and ptrauth is enabled. A flag is added in macro ptrauth_keys_install_kernel to check if isb instruction needs to be executed. Signed-off-by: Amit Daniel Kachhap Reviewed-by: Vincenzo Frascino Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/asm_pointer_auth.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'arch/arm64/include/asm/asm_pointer_auth.h') diff --git a/arch/arm64/include/asm/asm_pointer_auth.h b/arch/arm64/include/asm/asm_pointer_auth.h index d3f4aee42851..ce2a8486992b 100644 --- a/arch/arm64/include/asm/asm_pointer_auth.h +++ b/arch/arm64/include/asm/asm_pointer_auth.h @@ -39,14 +39,16 @@ alternative_if ARM64_HAS_GENERIC_AUTH alternative_else_nop_endif .endm - .macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3 + .macro ptrauth_keys_install_kernel tsk, sync, tmp1, tmp2, tmp3 alternative_if ARM64_HAS_ADDRESS_AUTH mov \tmp1, #THREAD_KEYS_KERNEL add \tmp1, \tsk, \tmp1 ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_KERNEL_KEY_APIA] msr_s SYS_APIAKEYLO_EL1, \tmp2 msr_s SYS_APIAKEYHI_EL1, \tmp3 + .if \sync == 1 isb + .endif alternative_else_nop_endif .endm @@ -55,7 +57,7 @@ alternative_else_nop_endif .macro ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3 .endm - .macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3 + .macro ptrauth_keys_install_kernel tsk, sync, tmp1, tmp2, tmp3 .endm #endif /* CONFIG_ARM64_PTR_AUTH */ -- cgit