From e502aaf0c596ff7cdfbd9ee1c21e050fb5f87e58 Mon Sep 17 00:00:00 2001
From: Dmitry Stogov <dmitry@zend.com>
Date: Mon, 4 Dec 2023 13:29:47 +0300
Subject: [PATCH] Prevent starting JIT on x86_64 with buffuer size above 2G

---
 ext/opcache/jit/zend_jit.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ext/opcache/jit/zend_jit.c b/ext/opcache/jit/zend_jit.c
index 098b7637e5030..3c62e25871b55 100644
--- a/ext/opcache/jit/zend_jit.c
+++ b/ext/opcache/jit/zend_jit.c
@@ -3414,6 +3414,13 @@ ZEND_EXT_API int zend_jit_check_support(void)
 		JIT_G(on) = 0;
 		return FAILURE;
 	}
+#elif defined(IR_TARGET_X64)
+	if (JIT_G(buffer_size) > 2 * Z_L(1024*1024*1024)) {
+		zend_error(E_WARNING, "JIT on x86_64 doesn't support opcache.jit_buffer_size above 2G.");
+		JIT_G(enabled) = 0;
+		JIT_G(on) = 0;
+		return FAILURE;
+	}
 #endif
 
 	return SUCCESS;