win32u: Use session BaseNamedObjects for display_device_init mutex.

The mutex is also used in user32, gdi32, and winevulkan, where it is opened through kernel32, which opens it from the session directory.

win32u: Use session BaseNamedObjects for display_device_init mutex.
94ece19f · Rémi Bernon · Alexandre Julliard · da4a45cd · 94ece19f
Commit 94ece19f authored Oct 19, 2022 by Rémi Bernon Committed by Alexandre Julliard Oct 19, 2022
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sysparams.c dlls/win32u/sysparams.c +7 -5

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--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -406,14 +406,16 @@ void user_check_not_lock(void)
 static HANDLE get_display_device_init_mutex( void )
 {
-    static const WCHAR display_device_initW[] =
+    WCHAR bufferW[256];
-        {'\\','B','a','s','e','N','a','m','e','d','O','b','j','e','c','t','s',
+    UNICODE_STRING name = {.Buffer = bufferW};
-         '\\','d','i','s','p','l','a','y','_','d','e','v','i','c','e','_','i','n','i','t'};
-    UNICODE_STRING name = { sizeof(display_device_initW), sizeof(display_device_initW),
-        (WCHAR *)display_device_initW };
    OBJECT_ATTRIBUTES attr;
+    char buffer[256];
    HANDLE mutex;
+    snprintf( buffer, ARRAY_SIZE(buffer), "\\Sessions\\%u\\BaseNamedObjects\\display_device_init",
+              NtCurrentTeb()->Peb->SessionId );
+    name.Length = name.MaximumLength = asciiz_to_unicode( bufferW, buffer );
    InitializeObjectAttributes( &attr, &name, OBJ_OPENIF, NULL, NULL );
    if (NtCreateMutant( &mutex, MUTEX_ALL_ACCESS, &attr, FALSE ) < 0) return 0;
    NtWaitForSingleObject( mutex, FALSE, NULL );