From eb8c07fe2f081a5e270f19c329180469d66142bb Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Mon, 25 Mar 2019 15:23:11 +0100
Subject: [PATCH] Support VirtualProtect for opcache.protect_memory

Don't enable this on AppVeyor yet, as there is still an open
issue in phar.
---
 ext/opcache/ZendAccelerator.c   |  4 ++++
 ext/opcache/zend_shared_alloc.c | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/ext/opcache/ZendAccelerator.c b/ext/opcache/ZendAccelerator.c
index 0bdee2bfe03..56651f2d4c8 100644
--- a/ext/opcache/ZendAccelerator.c
+++ b/ext/opcache/ZendAccelerator.c
@@ -305,7 +305,9 @@ static inline int accel_restart_is_active(void)
 static inline int accel_activate_add(void)
 {
 #ifdef ZEND_WIN32
+	SHM_UNPROTECT();
 	INCREMENT(mem_usage);
+	SHM_PROTECT();
 #else
 	struct flock mem_usage_lock;
 
@@ -327,8 +329,10 @@ static inline void accel_deactivate_sub(void)
 {
 #ifdef ZEND_WIN32
 	if (ZCG(counted)) {
+		SHM_UNPROTECT();
 		DECREMENT(mem_usage);
 		ZCG(counted) = 0;
+		SHM_PROTECT();
 	}
 #else
 	struct flock mem_usage_unlock;
diff --git a/ext/opcache/zend_shared_alloc.c b/ext/opcache/zend_shared_alloc.c
index 177cbcc46ff..e4e44c35be0 100644
--- a/ext/opcache/zend_shared_alloc.c
+++ b/ext/opcache/zend_shared_alloc.c
@@ -594,6 +594,25 @@ void zend_accel_shared_protect(int mode)
 	for (i = 0; i < ZSMMG(shared_segments_count); i++) {
 		mprotect(ZSMMG(shared_segments)[i]->p, ZSMMG(shared_segments)[i]->size, mode);
 	}
+#elif defined(ZEND_WIN32)
+	int i;
+
+	if (!smm_shared_globals) {
+		return;
+	}
+
+	if (mode) {
+		mode = PAGE_READONLY;
+	} else {
+		mode = PAGE_READWRITE;
+	}
+
+	for (i = 0; i < ZSMMG(shared_segments_count); i++) {
+		DWORD oldProtect;
+		if (!VirtualProtect(ZSMMG(shared_segments)[i]->p, ZSMMG(shared_segments)[i]->size, mode, &oldProtect)) {
+			zend_accel_error(ACCEL_LOG_ERROR, "Failed to protect memory");
+		}
+	}
 #endif
 }