1 files changed, 12 insertions, 11 deletions

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 7f5aec758f0e..853ea7a80806 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -395,7 +395,7 @@ DEFINE_IDTENTRY_DF(exc_double_fault)
 		/*
 		 * Adjust our frame so that we return straight to the #GP
 		 * vector with the expected RSP value.  This is safe because
-		 * we won't enable interupts or schedule before we invoke
+		 * we won't enable interrupts or schedule before we invoke
 		 * general_protection, so nothing will clobber the stack
 		 * frame we just set up.
 		 *
@@ -498,14 +498,15 @@ static enum kernel_gp_hint get_kernel_gp_address(struct pt_regs *regs,
 {
 	u8 insn_buf[MAX_INSN_SIZE];
 	struct insn insn;
+	int ret;
 
 	if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip,
 			MAX_INSN_SIZE))
 		return GP_NO_HINT;
 
-	kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);
-	insn_get_modrm(&insn);
-	insn_get_sib(&insn);
+	ret = insn_decode_kernel(&insn, insn_buf);
+	if (ret < 0)
+		return GP_NO_HINT;
 
 	*addr = (unsigned long)insn_get_addr_ref(&insn, regs);
 	if (*addr == -1UL)
@@ -556,7 +557,7 @@ DEFINE_IDTENTRY_ERRORCODE(exc_general_protection)
 		tsk->thread.trap_nr = X86_TRAP_GP;
 
 		if (fixup_vdso_exception(regs, X86_TRAP_GP, error_code, 0))
-			return;
+			goto exit;
 
 		show_signal(tsk, SIGSEGV, "", desc, regs, error_code);
 		force_sig(SIGSEGV);
@@ -694,8 +695,7 @@ asmlinkage __visible noinstr struct pt_regs *vc_switch_off_ist(struct pt_regs *r
 	 * In the SYSCALL entry path the RSP value comes from user-space - don't
 	 * trust it and switch to the current kernel stack
 	 */
-	if (regs->ip >= (unsigned long)entry_SYSCALL_64 &&
-	    regs->ip <  (unsigned long)entry_SYSCALL_64_safe_stack) {
+	if (ip_within_syscall_gap(regs)) {
 		sp = this_cpu_read(cpu_current_top_of_stack);
 		goto sync;
 	}
@@ -890,9 +890,6 @@ static __always_inline void exc_debug_kernel(struct pt_regs *regs,
 	if ((dr6 & DR_STEP) && is_sysenter_singlestep(regs))
 		dr6 &= ~DR_STEP;
 
-	if (kprobe_debug_handler(regs))
-		goto out;
-
 	/*
 	 * The kernel doesn't use INT1
 	 */
@@ -979,6 +976,10 @@ static __always_inline void exc_debug_user(struct pt_regs *regs,
 		goto out_irq;
 	}
 
+	/* #DB for bus lock can only be triggered from userspace. */
+	if (dr6 & DR_BUS_LOCK)
+		handle_bus_lock(regs);
+
 	/* Add the virtual_dr6 bits for signals. */
 	dr6 |= current->thread.virtual_dr6;
 	if (dr6 & (DR_STEP | DR_TRAP_BITS) || icebp)
@@ -1058,7 +1059,7 @@ static void math_error(struct pt_regs *regs, int trapnr)
 		goto exit;
 
 	if (fixup_vdso_exception(regs, trapnr, 0, 0))
-		return;
+		goto exit;
 
 	force_sig_fault(SIGFPE, si_code,
 			(void __user *)uprobe_get_trap_addr(regs));