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

From 25bb10aa7f39e1586812802589a42c9cfa7d2513 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 | 76 ++++++++++++++++++++++++++++++++++++
 dlls/ntdll/loader.c          | 65 ++++++++++++++++++++++++++++++
 include/winternl.h           |  2 +-
 3 files changed, 142 insertions(+), 1 deletion(-)

diff --git a/dlls/kernel32/tests/loader.c b/dlls/kernel32/tests/loader.c
index 35c6b3c0996..17d742daaa7 100644
--- a/dlls/kernel32/tests/loader.c
+++ b/dlls/kernel32/tests/loader.c
@@ -30,6 +30,7 @@
 #include "winbase.h"
 #include "winternl.h"
 #include "winnls.h"
+#include "winuser.h"
 #include "wine/test.h"
 #include "delayloadhandler.h"
 
@@ -3934,6 +3935,79 @@ static void test_LoadPackagedLibrary(void)
             h, GetLastError());
 }
 
+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_MODULE *module;
+    BOOL found;
+
+    entry = &NtCurrentTeb()->Peb->LdrData->InLoadOrderModuleList;
+    entry = entry->Flink;
+
+    module = CONTAINING_RECORD(entry, LDR_MODULE, InLoadOrderModuleList);
+    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_MODULE, 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_MODULE, HashLinks);
+        if (!lstrcmpiW(module->BaseDllName.Buffer, kernel32W))
+        {
+            found = TRUE;
+            break;
+        }
+    }
+    ok(found, "Could not find kernel32\n");
+}
+
 START_TEST(loader)
 {
     int argc;
@@ -4006,10 +4080,12 @@ 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" );
     test_dll_file( "user32.dll" );
+
     /* loader test must be last, it can corrupt the internal loader state on Windows */
     test_Loader();
 }
diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index 04ea7ea121a..2a8b4b3ad97 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -122,6 +122,9 @@ static const char * const reason_names[] =
 
 static const WCHAR dllW[] = {'.','d','l','l',0};
 
+#define HASH_MAP_SIZE 32
+static LIST_ENTRY hash_table[HASH_MAP_SIZE];
+
 /* internal representation of 32bit modules. per process. */
 typedef struct _wine_modref
 {
@@ -462,6 +465,52 @@ static void call_ldr_notifications( ULONG reason, LDR_MODULE *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);
+}
+
+/*************************************************************************
+ *      recompute_hash_maps
+ *
+ * Recomputes the LDR hash map (necessary when windows version changes).
+ */
+static void recompute_hash_map(void)
+{
+    PLIST_ENTRY mark, entry;
+    PLDR_MODULE mod;
+
+    mark = &NtCurrentTeb()->Peb->LdrData->InLoadOrderModuleList;
+    for (entry = mark->Flink; entry != mark; entry = entry->Flink)
+    {
+        mod = CONTAINING_RECORD(entry, LDR_MODULE, InLoadOrderModuleList);
+        RemoveEntryList( &mod->HashLinks );
+        InsertTailList( &hash_table[hash_basename(mod->BaseDllName.Buffer)], &mod->HashLinks );
+    }
+}
+
 /*************************************************************************
  *		get_modref
  *
@@ -1227,7 +1276,12 @@ static WINE_MODREF *alloc_module( HMODULE hModule, const UNICODE_STRING *nt_name
                    &wm->ldr.InLoadOrderModuleList);
     InsertTailList(&NtCurrentTeb()->Peb->LdrData->InMemoryOrderModuleList,
                    &wm->ldr.InMemoryOrderModuleList);
+    InsertTailList(&hash_table[hash_basename(wm->ldr.BaseDllName.Buffer)],
+                   &wm->ldr.HashLinks);
+
     /* wait until init is called for inserting into InInitializationOrderModuleList */
+    wm->ldr.InInitializationOrderModuleList.Flink = NULL;
+    wm->ldr.InInitializationOrderModuleList.Blink = NULL;
 
     if (!(nt->OptionalHeader.DllCharacteristics & IMAGE_DLLCHARACTERISTICS_NX_COMPAT))
     {
@@ -2030,6 +2084,7 @@ static NTSTATUS build_so_dll_module( const WCHAR *load_path, const UNICODE_STRIN
             /* the module has only been inserted in the load & memory order lists */
             RemoveEntryList(&wm->ldr.InLoadOrderModuleList);
             RemoveEntryList(&wm->ldr.InMemoryOrderModuleList);
+            RemoveEntryList(&wm->ldr.HashLinks);
             /* FIXME: free the modref */
             return status;
         }
@@ -2573,6 +2628,7 @@ static NTSTATUS load_native_dll( LPCWSTR load_path, const UNICODE_STRING *nt_nam
             /* the module has only be inserted in the load & memory order lists */
             RemoveEntryList(&wm->ldr.InLoadOrderModuleList);
             RemoveEntryList(&wm->ldr.InMemoryOrderModuleList);
+            RemoveEntryList(&wm->ldr.HashLinks);
 
             /* FIXME: there are several more dangling references
              * left. Including dlls loaded by this dll before the
@@ -3791,6 +3847,7 @@ static void free_modref( WINE_MODREF *wm )
 {
     RemoveEntryList(&wm->ldr.InLoadOrderModuleList);
     RemoveEntryList(&wm->ldr.InMemoryOrderModuleList);
+    RemoveEntryList(&wm->ldr.HashLinks);
     if (wm->ldr.InInitializationOrderModuleList.Flink)
         RemoveEntryList(&wm->ldr.InInitializationOrderModuleList);
 
@@ -4488,6 +4545,7 @@ void __wine_process_init(void)
     SIZE_T info_size;
     TEB *teb = thread_init();
     PEB *peb = teb->Peb;
+    DWORD i;
 
     /* setup the server connection */
     server_init_process();
@@ -4510,6 +4568,10 @@ void __wine_process_init(void)
     load_global_options();
     version_init();
 
+    /* initialize hash table */
+    for (i = 0; i < HASH_MAP_SIZE; i++)
+        InitializeListHead(&hash_table[i]);
+
     /* setup the load callback and create ntdll modref */
     RtlInitUnicodeString( &nt_name, ntdllW );
     map_so_dll( &__wine_spec_nt_header, ntdll_module );
@@ -4586,5 +4648,8 @@ void __wine_process_init(void)
     teb->Tib.StackLimit = stack.StackLimit;
     teb->DeallocationStack = stack.DeallocationStack;
 
+    /* the windows version was not set yet when ntdll and kernel32 were loaded */
+    recompute_hash_map();
+
     server_init_process_done();
 }
diff --git a/include/winternl.h b/include/winternl.h
index b77ab8fe03a..3d4863d8b04 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -2268,8 +2268,8 @@ typedef struct _LDR_MODULE
     ULONG               Flags;
     SHORT               LoadCount;
     SHORT               TlsIndex;
-    HANDLE              SectionHandle;
     ULONG               CheckSum;
+    LIST_ENTRY          HashLinks;
     ULONG               TimeDateStamp;
     HANDLE              ActivationContext;
     PVOID               PatchInformation;
-- 
2.26.0