From c50232eb320d56d526ba5e6cb5bda8cf5a848a55 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sun, 23 Jan 2022 19:16:53 +0100
Subject: [PATCH] Always exit after machine code page protection change fails.

Reported by Sergey Kaplun.
---
 src/lj_mcode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lj_mcode.c b/src/lj_mcode.c
index ac37c1a6..0a3b3fa3 100644
--- a/src/lj_mcode.c
+++ b/src/lj_mcode.c
@@ -180,7 +180,7 @@ static void mcode_protect(jit_State *J, int prot)
 #define MCPROT_RUN	MCPROT_RX
 
 /* Protection twiddling failed. Probably due to kernel security. */
-static LJ_NOINLINE void mcode_protfail(jit_State *J)
+static LJ_NORET LJ_NOINLINE void mcode_protfail(jit_State *J)
 {
   lua_CFunction panic = J2G(J)->panic;
   if (panic) {
@@ -188,6 +188,7 @@ static LJ_NOINLINE void mcode_protfail(jit_State *J)
     setstrV(L, L->top++, lj_err_str(L, LJ_ERR_JITPROT));
     panic(L);
   }
+  exit(EXIT_FAILURE);
 }
 
 /* Change protection of MCode area. */