wine-staging/patches/ntdll-HashLinks/0001-ntdll-Implement-HashLinks-field-in-LDR-module-data.patch

From ee26472916e2196456c0c59fb8ca04ee362f148a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20M=C3=BCller?= <michael@fds-team.de>
Date: Mon, 3 Apr 2017 05:30:27 +0200
Subject: [PATCH] ntdll: Implement HashLinks field in LDR module data.

---
 dlls/kernel32/tests/loader.c | 75 ++++++++++++++++++++++++++++++++++++
 dlls/ntdll/loader.c          | 42 ++++++++++++++++++++
 2 files changed, 117 insertions(+)

diff --git a/dlls/kernel32/tests/loader.c b/dlls/kernel32/tests/loader.c
index 8b332e479e6..08cb3d3f8ce 100644
--- a/dlls/kernel32/tests/loader.c
+++ b/dlls/kernel32/tests/loader.c
@@ -28,6 +28,7 @@
 #include "winbase.h"
 #include "winternl.h"
 #include "winnls.h"
+#include "winuser.h"
 #include "wine/test.h"
 #include "delayloadhandler.h"
 
@@ -4641,6 +4642,79 @@ static void test_Wow64Transition(void)
             debugstr_wn(name->SectionFileName.Buffer, name->SectionFileName.Length / sizeof(WCHAR)));
 }
 
+static inline WCHAR toupperW(WCHAR c)
+{
+    WCHAR tmp = c;
+    CharUpperBuffW(&tmp, 1);
+    return tmp;
+}
+
+static ULONG hash_basename(const WCHAR *basename)
+{
+    WORD version = MAKEWORD(NtCurrentTeb()->Peb->OSMinorVersion,
+                            NtCurrentTeb()->Peb->OSMajorVersion);
+    ULONG hash = 0;
+
+    if (version >= 0x0602)
+    {
+        for (; *basename; basename++)
+            hash = hash * 65599 + toupperW(*basename);
+    }
+    else if (version == 0x0601)
+    {
+        for (; *basename; basename++)
+            hash = hash + 65599 * toupperW(*basename);
+    }
+    else
+        hash = toupperW(basename[0]) - 'A';
+
+    return hash & 31;
+}
+
+static void test_HashLinks(void)
+{
+    static WCHAR ntdllW[] = {'n','t','d','l','l','.','d','l','l',0};
+    static WCHAR kernel32W[] = {'k','e','r','n','e','l','3','2','.','d','l','l',0};
+
+    LIST_ENTRY *hash_map, *entry, *mark;
+    LDR_DATA_TABLE_ENTRY *module;
+    BOOL found;
+
+    entry = &NtCurrentTeb()->Peb->LdrData->InLoadOrderModuleList;
+    entry = entry->Flink;
+
+    module = CONTAINING_RECORD(entry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
+    entry = module->HashLinks.Blink;
+
+    hash_map = entry - hash_basename(module->BaseDllName.Buffer);
+
+    mark = &hash_map[hash_basename(ntdllW)];
+    found = FALSE;
+    for (entry = mark->Flink; entry != mark; entry = entry->Flink)
+    {
+        module = CONTAINING_RECORD(entry, LDR_DATA_TABLE_ENTRY, HashLinks);
+        if (!lstrcmpiW(module->BaseDllName.Buffer, ntdllW))
+        {
+            found = TRUE;
+            break;
+        }
+    }
+    ok(found, "Could not find ntdll\n");
+
+    mark = &hash_map[hash_basename(kernel32W)];
+    found = FALSE;
+    for (entry = mark->Flink; entry != mark; entry = entry->Flink)
+    {
+        module = CONTAINING_RECORD(entry, LDR_DATA_TABLE_ENTRY, HashLinks);
+        if (!lstrcmpiW(module->BaseDllName.Buffer, kernel32W))
+        {
+            found = TRUE;
+            break;
+        }
+    }
+    ok(found, "Could not find kernel32\n");
+}
+
 START_TEST(loader)
 {
     int argc;
@@ -4723,6 +4797,7 @@ START_TEST(loader)
     test_InMemoryOrderModuleList();
     test_LoadPackagedLibrary();
     test_wow64_redirection();
+    test_HashLinks();
     test_dll_file( "ntdll.dll" );
     test_dll_file( "kernel32.dll" );
     test_dll_file( "advapi32.dll" );
diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index 5f84ca7e23b..4da48a82d74 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -128,6 +128,9 @@ struct file_id
     BYTE ObjectId[16];
 };
 
+#define HASH_MAP_SIZE 32
+static LIST_ENTRY hash_table[HASH_MAP_SIZE];
+
 /* internal representation of loaded modules */
 typedef struct _wine_modref
 {
@@ -556,6 +559,33 @@ static void call_ldr_notifications( ULONG reason, LDR_DATA_TABLE_ENTRY *module )
     }
 }
 
+/*************************************************************************
+ *      hash_basename
+ *
+ * Calculates the bucket index of a dll using the basename.
+ */
+static ULONG hash_basename(const WCHAR *basename)
+{
+    WORD version = MAKEWORD(NtCurrentTeb()->Peb->OSMinorVersion,
+                            NtCurrentTeb()->Peb->OSMajorVersion);
+    ULONG hash = 0;
+
+    if (version >= 0x0602)
+    {
+        for (; *basename; basename++)
+            hash = hash * 65599 + towupper(*basename);
+    }
+    else if (version == 0x0601)
+    {
+        for (; *basename; basename++)
+            hash = hash + 65599 * towupper(*basename);
+    }
+    else
+        hash = towupper(basename[0]) - 'A';
+
+    return hash & (HASH_MAP_SIZE-1);
+}
+
 /*************************************************************************
  *		get_modref
  *
@@ -1557,7 +1587,12 @@ static WINE_MODREF *alloc_module( HMODULE hModule, const UNICODE_STRING *nt_name
                    &wm->ldr.InLoadOrderLinks);
     InsertTailList(&NtCurrentTeb()->Peb->LdrData->InMemoryOrderModuleList,
                    &wm->ldr.InMemoryOrderLinks);
+    InsertTailList(&hash_table[hash_basename(wm->ldr.BaseDllName.Buffer)],
+                   &wm->ldr.HashLinks);
+
     /* wait until init is called for inserting into InInitializationOrderModuleList */
+    wm->ldr.InInitializationOrderLinks.Flink = NULL;
+    wm->ldr.InInitializationOrderLinks.Blink = NULL;
 
     if (!(nt->OptionalHeader.DllCharacteristics & IMAGE_DLLCHARACTERISTICS_NX_COMPAT))
     {
@@ -2253,6 +2288,7 @@ static NTSTATUS build_module( LPCWSTR load_path, const UNICODE_STRING *nt_name,
             /* the module has only be inserted in the load & memory order lists */
             RemoveEntryList(&wm->ldr.InLoadOrderLinks);
             RemoveEntryList(&wm->ldr.InMemoryOrderLinks);
+            RemoveEntryList(&wm->ldr.HashLinks);
 
             /* FIXME: there are several more dangling references
              * left. Including dlls loaded by this dll before the
@@ -3916,6 +3952,7 @@ static void free_modref( WINE_MODREF *wm )
 
     RemoveEntryList(&wm->ldr.InLoadOrderLinks);
     RemoveEntryList(&wm->ldr.InMemoryOrderLinks);
+    RemoveEntryList(&wm->ldr.HashLinks);
     if (wm->ldr.InInitializationOrderLinks.Flink)
         RemoveEntryList(&wm->ldr.InInitializationOrderLinks);
 
@@ -4336,6 +4373,7 @@ void loader_init( CONTEXT *context, void **entry )
         ANSI_STRING ctrl_routine = RTL_CONSTANT_STRING( "CtrlRoutine" );
         WINE_MODREF *kernel32;
         PEB *peb = NtCurrentTeb()->Peb;
+        unsigned int i;
 
         peb->LdrData            = &ldr;
         peb->FastPebLock        = &peb_lock;
@@ -4354,6 +4392,10 @@ void loader_init( CONTEXT *context, void **entry )
         if (!(tls_dirs = RtlAllocateHeap( GetProcessHeap(), HEAP_ZERO_MEMORY, tls_module_count * sizeof(*tls_dirs) )))
             NtTerminateProcess( GetCurrentProcess(), STATUS_NO_MEMORY );
 
+        /* initialize hash table */
+        for (i = 0; i < HASH_MAP_SIZE; i++)
+            InitializeListHead( &hash_table[i] );
+
         init_user_process_params();
         load_global_options();
         version_init();
-- 
2.45.2