[PATCH 5/5] server: Forbid shrinking files which are mapped to memory.

[Zebediah Figura]

From: Qian Hong <qhong at codeweavers.com>

Signed-off-by: Zebediah Figura <z.figura12 at gmail.com>
---
This patch had a corresponding entry in the old wine-staging bug tracker (bug
471). I could not find any details relating to the bug, except that it is
related to msys2.

 dlls/kernel32/tests/file.c | 18 +++++++++---------
 server/fd.c                | 21 ++++++++++++++++++++-
 2 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/dlls/kernel32/tests/file.c b/dlls/kernel32/tests/file.c
index c09438e09bd..ea0a32f258d 100644
--- a/dlls/kernel32/tests/file.c
+++ b/dlls/kernel32/tests/file.c
@@ -6052,11 +6052,11 @@ static void test_eof(void)
         SetLastError(0xdeadbeef);
         SetFilePointer(file, 6, NULL, SEEK_SET);
         ret = SetEndOfFile(file);
-        todo_wine ok(!ret, "expected failure\n");
-        todo_wine ok(GetLastError() == ERROR_USER_MAPPED_FILE, "got error %u\n", GetLastError());
+        ok(!ret, "expected failure\n");
+        ok(GetLastError() == ERROR_USER_MAPPED_FILE, "got error %u\n", GetLastError());
         ret = GetFileSizeEx(file, &file_size);
         ok(ret, "failed to get size, error %u\n", GetLastError());
-        todo_wine ok(file_size.QuadPart == 8, "got size %I64d\n", file_size.QuadPart);
+        ok(file_size.QuadPart == 8, "got size %I64d\n", file_size.QuadPart);
 
         SetFilePointer(file, 8192, NULL, SEEK_SET);
         ret = SetEndOfFile(file);
@@ -6067,11 +6067,11 @@ static void test_eof(void)
 
         SetFilePointer(file, 8191, NULL, SEEK_SET);
         ret = SetEndOfFile(file);
-        todo_wine ok(!ret, "expected failure\n");
-        todo_wine ok(GetLastError() == ERROR_USER_MAPPED_FILE, "got error %u\n", GetLastError());
+        ok(!ret, "expected failure\n");
+        ok(GetLastError() == ERROR_USER_MAPPED_FILE, "got error %u\n", GetLastError());
         ret = GetFileSizeEx(file, &file_size);
         ok(ret, "failed to get size, error %u\n", GetLastError());
-        todo_wine ok(file_size.QuadPart == 8192, "got size %I64d\n", file_size.QuadPart);
+        ok(file_size.QuadPart == 8192, "got size %I64d\n", file_size.QuadPart);
 
         view = MapViewOfFile(mapping, map_tests[i].view_access, 0, 0, 4);
         ok(!!view, "failed to map view, error %u\n", GetLastError());
@@ -6087,11 +6087,11 @@ static void test_eof(void)
 
         SetFilePointer(file, 16383, NULL, SEEK_SET);
         ret = SetEndOfFile(file);
-        todo_wine ok(!ret, "expected failure\n");
-        todo_wine ok(GetLastError() == ERROR_USER_MAPPED_FILE, "got error %u\n", GetLastError());
+        ok(!ret, "expected failure\n");
+        ok(GetLastError() == ERROR_USER_MAPPED_FILE, "got error %u\n", GetLastError());
         ret = GetFileSizeEx(file, &file_size);
         ok(ret, "failed to get size, error %u\n", GetLastError());
-        todo_wine ok(file_size.QuadPart == 16384, "got size %I64d\n", file_size.QuadPart);
+        ok(file_size.QuadPart == 16384, "got size %I64d\n", file_size.QuadPart);
 
         ret = UnmapViewOfFile(view);
         ok(ret, "failed to unmap view, error %u\n", GetLastError());
diff --git a/server/fd.c b/server/fd.c
index fe97ca01c98..99fe103c87c 100644
--- a/server/fd.c
+++ b/server/fd.c
@@ -2647,11 +2647,30 @@ static void set_fd_eof( struct fd *fd, file_pos_t eof )
         return;
     }
 
+    if (fstat( fd->unix_fd, &st) == -1)
+    {
+        file_set_error();
+        return;
+    }
+
+    if (eof < st.st_size)
+    {
+        struct fd *fd_ptr;
+        LIST_FOR_EACH_ENTRY( fd_ptr, &fd->inode->open, struct fd, inode_entry )
+        {
+            if (fd_ptr->access & FILE_MAPPING_ACCESS)
+            {
+                set_error( STATUS_USER_MAPPED_FILE );
+                return;
+            }
+        }
+    }
+
     /* first try normal truncate */
     if (ftruncate( fd->unix_fd, eof ) != -1) return;
 
     /* now check for the need to extend the file */
-    if (fstat( fd->unix_fd, &st ) != -1 && eof > st.st_size)
+    if (eof > st.st_size)
     {
         /* extend the file one byte beyond the requested size and then truncate it */
         /* this should work around ftruncate implementations that can't extend files */
-- 
2.30.2