Fix restoring from pdumper file on MS-Windows 9X

* src/pdumper.c (dump_map_file_w32): Use PAGE_WRITECOPY flag when
calling CreateFileMapping for DUMP_MEMORY_ACCESS_READWRITE access,
as that is required by Windows 9X.  (Bug#50453)

1 files changed, 14 insertions, 1 deletions

diff --git a/src/pdumper.c b/src/pdumper.c
index 7730ea3d061..2291fced5d7 100644
--- a/src/pdumper.c
+++ b/src/pdumper.c
@@ -4537,15 +4537,28 @@ dump_map_file_w32 (void *base, int fd, off_t offset, size_t size,
   uint32_t offset_low = (uint32_t) (full_offset & 0xffffffff);
 
   int error;
+  DWORD protect;
   DWORD map_access;
 
   file = (HANDLE) _get_osfhandle (fd);
   if (file == INVALID_HANDLE_VALUE)
     goto out;
 
+  switch (protection)
+    {
+    case DUMP_MEMORY_ACCESS_READWRITE:
+      protect = PAGE_WRITECOPY; /* for Windows 9X */
+      break;
+    default:
+    case DUMP_MEMORY_ACCESS_NONE:
+    case DUMP_MEMORY_ACCESS_READ:
+      protect = PAGE_READONLY;
+      break;
+    }
+
   section = CreateFileMapping (file,
                                /*lpAttributes=*/NULL,
-                               PAGE_READONLY,
+                               protect,
                                /*dwMaximumSizeHigh=*/0,
                                /*dwMaximumSizeLow=*/0,
                                /*lpName=*/NULL);