arm64: don't call break hooks for BRK exceptions from EL0

Our break hooks are used to handle brk exceptions from kgdb (and potentially
kprobes if that code ever resurfaces), so don't bother calling them if
the BRK exception comes from userspace.

This prevents userspace from trapping to a kdb shell on systems where
kgdb is enabled and active.

Cc: <stable@vger.kernel.org>
Reported-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

arch/arm64/kernel/debug-monitors.c

@@ -315,12 +315,7 @@ static int brk_handler(unsigned long addr, unsigned int esr,
 {
 	siginfo_t info;
 
-	if (call_break_hook(regs, esr) == DBG_HOOK_HANDLED)
-		return 0;
-
-	if (!user_mode(regs))
-		return -EFAULT;
-
+	if (user_mode(regs)) {
 		info = (siginfo_t) {
 			.si_signo = SIGTRAP,
 			.si_errno = 0,
@@ -329,6 +324,11 @@ static int brk_handler(unsigned long addr, unsigned int esr,
 		};
 
 		force_sig_info(SIGTRAP, &info, current);
+	} else if (call_break_hook(regs, esr) != DBG_HOOK_HANDLED) {
+		pr_warning("Unexpected kernel BRK exception at EL1\n");
+		return -EFAULT;
+	}
+
 	return 0;
 }