diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h index 6c869d1f51cc..3ed01b913f81 100644 --- a/arch/arm64/include/asm/exception.h +++ b/arch/arm64/include/asm/exception.h @@ -34,7 +34,8 @@ void arm64_enter_nmi(struct pt_regs *regs); void arm64_exit_nmi(struct pt_regs *regs); void do_mem_abort(unsigned long addr, unsigned int esr, struct pt_regs *regs); void do_undefinstr(struct pt_regs *regs, unsigned long esr); -void do_bti(struct pt_regs *regs); +void do_el0_bti(struct pt_regs *regs); +void do_el1_bti(struct pt_regs *regs, unsigned long esr); asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr); void do_debug_exception(unsigned long addr_if_watchpoint, unsigned int esr, struct pt_regs *regs); diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index b17f848a09c5..53e596aae4e8 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -141,6 +141,15 @@ static void noinstr el1_undef(struct pt_regs *regs, unsigned long esr) exit_to_kernel_mode(regs); } +static void noinstr el1_bti(struct pt_regs *regs, unsigned long esr) +{ + enter_from_kernel_mode(regs); + local_daif_inherit(regs); + do_el1_bti(regs, esr); + local_daif_mask(); + exit_to_kernel_mode(regs); +} + static void noinstr el1_inv(struct pt_regs *regs, unsigned long esr) { enter_from_kernel_mode(regs); @@ -212,6 +221,9 @@ asmlinkage void noinstr el1_sync_handler(struct pt_regs *regs) case ESR_ELx_EC_UNKNOWN: el1_undef(regs, esr); break; + case ESR_ELx_EC_BTI: + el1_bti(regs, esr); + break; case ESR_ELx_EC_BREAKPT_CUR: case ESR_ELx_EC_SOFTSTP_CUR: case ESR_ELx_EC_WATCHPT_CUR: @@ -327,7 +339,7 @@ static void noinstr el0_bti(struct pt_regs *regs) { enter_from_user_mode(); local_daif_restore(DAIF_PROCCTX); - do_bti(regs); + do_el0_bti(regs); } static void noinstr el0_inv(struct pt_regs *regs, unsigned long esr) diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 5d29ba0d85c1..da13cfeee706 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -411,12 +411,16 @@ void do_undefinstr(struct pt_regs *regs, unsigned long esr) } NOKPROBE_SYMBOL(do_undefinstr); -void do_bti(struct pt_regs *regs) +void do_el0_bti(struct pt_regs *regs) { - BUG_ON(!user_mode(regs)); force_signal_inject(SIGILL, ILL_ILLOPC, regs->pc, 0); } -NOKPROBE_SYMBOL(do_bti); + +void do_el1_bti(struct pt_regs *regs, unsigned long esr) +{ + die("Oops - BTI", regs, esr); +} +NOKPROBE_SYMBOL(do_el1_bti); void do_el0_fpac(struct pt_regs *regs, unsigned long esr) {