From 40d0e55d4c03be43a7b5a5906496a588f61ca00c Mon Sep 17 00:00:00 2001
From: Nikolay Sivov <nsivov@codeweavers.com>
Date: Sun, 18 Sep 2022 15:50:47 +0300
Subject: [PATCH] kernelbase: Add OpenFileMappingFromApp().

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
---
 dlls/kernelbase/kernelbase.spec |  2 +-
 dlls/kernelbase/sync.c          | 18 ++++++++++++++++++
 dlls/kernelbase/tests/process.c | 27 +++++++++++++++++++++++++++
 include/winbase.h               |  1 +
 4 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/dlls/kernelbase/kernelbase.spec b/dlls/kernelbase/kernelbase.spec
index feb1fce8f7a..961c2bf45ee 100644
--- a/dlls/kernelbase/kernelbase.spec
+++ b/dlls/kernelbase/kernelbase.spec
@@ -1015,7 +1015,7 @@
 @ stdcall OpenEventA(long long str)
 @ stdcall OpenEventW(long long wstr)
 @ stdcall OpenFileById(long ptr long long ptr long)
-# @ stub OpenFileMappingFromApp
+@ stdcall OpenFileMappingFromApp(long long wstr)
 @ stdcall OpenFileMappingW(long long wstr)
 # @ stub OpenGlobalizationUserSettingsKey
 @ stdcall OpenMutexW(long long wstr)
diff --git a/dlls/kernelbase/sync.c b/dlls/kernelbase/sync.c
index 5c4fb76536f..1526db25f33 100644
--- a/dlls/kernelbase/sync.c
+++ b/dlls/kernelbase/sync.c
@@ -971,6 +971,24 @@ HANDLE WINAPI DECLSPEC_HOTPATCH OpenFileMappingW( DWORD access, BOOL inherit, LP
 }
 
 
+/***********************************************************************
+ *             OpenFileMappingFromApp   (kernelbase.@)
+ */
+HANDLE WINAPI DECLSPEC_HOTPATCH OpenFileMappingFromApp( ULONG access, BOOL inherit, LPCWSTR name )
+{
+    OBJECT_ATTRIBUTES attr;
+    UNICODE_STRING nameW;
+    HANDLE ret;
+
+    if (!get_open_object_attributes( &attr, &nameW, inherit, name )) return 0;
+
+    if (access == FILE_MAP_COPY) access = SECTION_MAP_READ;
+
+    if (!set_ntstatus( NtOpenSection( &ret, access, &attr ))) return 0;
+    return ret;
+}
+
+
 /***********************************************************************
  * Condition variables
  ***********************************************************************/
diff --git a/dlls/kernelbase/tests/process.c b/dlls/kernelbase/tests/process.c
index 62debfb9861..d86dc38afcd 100644
--- a/dlls/kernelbase/tests/process.c
+++ b/dlls/kernelbase/tests/process.c
@@ -36,6 +36,7 @@ static LPVOID (WINAPI *pMapViewOfFile3)(HANDLE, HANDLE, PVOID, ULONG64 offset, S
 static LPVOID (WINAPI *pVirtualAlloc2)(HANDLE, void *, SIZE_T, DWORD, DWORD, MEM_EXTENDED_PARAMETER *, ULONG);
 static LPVOID (WINAPI *pVirtualAlloc2FromApp)(HANDLE, void *, SIZE_T, DWORD, DWORD, MEM_EXTENDED_PARAMETER *, ULONG);
 static PVOID (WINAPI *pVirtualAllocFromApp)(PVOID, SIZE_T, DWORD, DWORD);
+static HANDLE (WINAPI *pOpenFileMappingFromApp)( ULONG, BOOL, LPCWSTR);
 
 static void test_CompareObjectHandles(void)
 {
@@ -324,6 +325,30 @@ static void test_VirtualAlloc2FromApp(void)
     }
 }
 
+static void test_OpenFileMappingFromApp(void)
+{
+    HANDLE file, mapping;
+
+    if (!pOpenFileMappingFromApp)
+    {
+        win_skip("OpenFileMappingFromApp is not available.\n");
+        return;
+    }
+
+    file = CreateFileMappingA(INVALID_HANDLE_VALUE, NULL, PAGE_EXECUTE_READ, 0, 4090, "foo");
+    ok(!!file, "Failed to create a mapping.\n");
+
+    mapping = pOpenFileMappingFromApp(FILE_MAP_READ, FALSE, L"foo");
+    ok(!!mapping, "Failed to open a mapping.\n");
+    CloseHandle(mapping);
+
+    mapping = pOpenFileMappingFromApp(FILE_MAP_EXECUTE, FALSE, L"foo");
+    ok(!!mapping, "Failed to open a mapping.\n");
+    CloseHandle(mapping);
+
+    CloseHandle(file);
+}
+
 static void init_funcs(void)
 {
     HMODULE hmod = GetModuleHandleA("kernelbase.dll");
@@ -331,6 +356,7 @@ static void init_funcs(void)
 #define X(f) { p##f = (void*)GetProcAddress(hmod, #f); }
     X(CompareObjectHandles);
     X(MapViewOfFile3);
+    X(OpenFileMappingFromApp);
     X(VirtualAlloc2);
     X(VirtualAlloc2FromApp);
     X(VirtualAllocFromApp);
@@ -346,4 +372,5 @@ START_TEST(process)
     test_VirtualAlloc2();
     test_VirtualAllocFromApp();
     test_VirtualAlloc2FromApp();
+    test_OpenFileMappingFromApp();
 }
diff --git a/include/winbase.h b/include/winbase.h
index 0a8409c10e1..83282ec8af5 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -2537,6 +2537,7 @@ WINBASEAPI HFILE       WINAPI OpenFile(LPCSTR,OFSTRUCT*,UINT);
 WINBASEAPI HANDLE      WINAPI OpenFileMappingA(DWORD,BOOL,LPCSTR);
 WINBASEAPI HANDLE      WINAPI OpenFileMappingW(DWORD,BOOL,LPCWSTR);
 #define                       OpenFileMapping WINELIB_NAME_AW(OpenFileMapping)
+WINBASEAPI HANDLE      WINAPI OpenFileMappingFromApp(ULONG,BOOL,LPCWSTR);
 WINBASEAPI HANDLE      WINAPI OpenJobObjectA(DWORD,BOOL,LPCSTR);
 WINBASEAPI HANDLE      WINAPI OpenJobObjectW(DWORD,BOOL,LPCWSTR);
 #define                       OpenJobObject WINELIB_NAME_AW(OpenJobObject)