diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 2c34f5d9db0a6c28ac70ba60956a7b4ba30a20fc..6f787ae3bb56b25fb2ce09d29f3a4e676ed12e4d 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -1073,10 +1073,11 @@ alternative_else_nop_endif .macro tramp_ventry, vector_start, regsize, kpti .align 7 1: - .if \kpti == 1 .if \regsize == 64 msr tpidrro_el0, x30 // Restored in kernel_ventry .endif + + .if \kpti == 1 /* * Defend against branch aliasing attacks by pushing a dummy * entry onto the return stack and using a RET instruction to @@ -1159,6 +1160,38 @@ __entry_tramp_data_start: #endif /* CONFIG_RANDOMIZE_BASE */ #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ +/* + * Exception vectors for spectre mitigations on entry from EL1 when + * kpti is not in use. + */ + .macro generate_el1_vector +.Lvector_start\@: + kernel_ventry 1, sync_invalid // Synchronous EL1t + kernel_ventry 1, irq_invalid // IRQ EL1t + kernel_ventry 1, fiq_invalid // FIQ EL1t + kernel_ventry 1, error_invalid // Error EL1t + + kernel_ventry 1, sync // Synchronous EL1h + kernel_ventry 1, irq // IRQ EL1h + kernel_ventry 1, fiq_invalid // FIQ EL1h + kernel_ventry 1, error // Error EL1h + + .rept 4 + tramp_ventry .Lvector_start\@, 64, kpti=0 + .endr + .rept 4 + tramp_ventry .Lvector_start\@, 32, kpti=0 + .endr + .endm + + .pushsection ".entry.text", "ax" + .align 11 +ENTRY(__bp_harden_el1_vectors) + generate_el1_vector +END(__bp_harden_el1_vectors) + .popsection + + /* * Register switch for AArch64. The callee-saved registers need to be saved * and restored. On entry: