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[Qemu-devel] [PATCH v3 39/43] osdep: introduce qemu_mprotect_rwx/none


From: Emilio G. Cota
Subject: [Qemu-devel] [PATCH v3 39/43] osdep: introduce qemu_mprotect_rwx/none
Date: Wed, 19 Jul 2017 23:09:25 -0400

Signed-off-by: Emilio G. Cota <address@hidden>
---
 include/qemu/osdep.h |  2 ++
 util/osdep.c         | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 0cba871..2c7d7db 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -348,6 +348,8 @@ void sigaction_invoke(struct sigaction *action,
 #endif
 
 int qemu_madvise(void *addr, size_t len, int advice);
+int qemu_mprotect_rwx(void *addr, size_t size);
+int qemu_mprotect_none(void *addr, size_t size);
 
 int qemu_open(const char *name, int flags, ...);
 int qemu_close(int fd);
diff --git a/util/osdep.c b/util/osdep.c
index a2863c8..f72d679 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -81,6 +81,47 @@ int qemu_madvise(void *addr, size_t len, int advice)
 #endif
 }
 
+static int qemu_mprotect__osdep(void *addr, size_t size, int prot)
+{
+    g_assert(!((uintptr_t)addr & ~qemu_real_host_page_mask));
+    g_assert(!(size & ~qemu_real_host_page_mask));
+
+#ifdef _WIN32
+    DWORD old_protect;
+
+    if (!VirtualProtect(addr, size, prot, &old_protect)) {
+        error_report("%s: VirtualProtect failed with error code %d",
+                     __func__, GetLastError());
+        return -1;
+    }
+    return 0;
+#else
+    if (mprotect(addr, size, prot)) {
+        error_report("%s: mprotect failed: %s", __func__, strerror(errno));
+        return -1;
+    }
+    return 0;
+#endif
+}
+
+int qemu_mprotect_rwx(void *addr, size_t size)
+{
+#ifdef _WIN32
+    return qemu_mprotect__osdep(addr, size, PAGE_EXECUTE_READWRITE);
+#else
+    return qemu_mprotect__osdep(addr, size, PROT_READ | PROT_WRITE | 
PROT_EXEC);
+#endif
+}
+
+int qemu_mprotect_none(void *addr, size_t size)
+{
+#ifdef _WIN32
+    return qemu_mprotect__osdep(addr, size, PAGE_NOACCESS);
+#else
+    return qemu_mprotect__osdep(addr, size, PROT_NONE);
+#endif
+}
+
 #ifndef _WIN32
 /*
  * Dups an fd and sets the flags
-- 
2.7.4




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