From aadd7b2c0ca9bf60d64c3ed4e0722de3899b8c13 Mon Sep 17 00:00:00 2001
From: Dmitry Timoshkov <dmitry@baikal.ru>
Date: Thu, 28 Apr 2016 18:14:36 +0800
Subject: ntdll: Implement NtSetLdtEntries.

---
 dlls/kernel32/tests/thread.c | 79 ++++++++++++++++++++++++++++++++++++++++++++
 dlls/ntdll/nt.c              | 28 +++++++++++++++-
 2 files changed, 106 insertions(+), 1 deletion(-)

diff --git a/dlls/kernel32/tests/thread.c b/dlls/kernel32/tests/thread.c
index e0de3f9..981e3c4 100644
--- a/dlls/kernel32/tests/thread.c
+++ b/dlls/kernel32/tests/thread.c
@@ -102,6 +102,7 @@ static NTSTATUS (WINAPI *pNtQueryInformationThread)(HANDLE,THREADINFOCLASS,PVOID
 static BOOL (WINAPI *pGetThreadGroupAffinity)(HANDLE,GROUP_AFFINITY*);
 static BOOL (WINAPI *pSetThreadGroupAffinity)(HANDLE,const GROUP_AFFINITY*,GROUP_AFFINITY*);
 static NTSTATUS (WINAPI *pNtSetInformationThread)(HANDLE,THREADINFOCLASS,LPCVOID,ULONG);
+static NTSTATUS (WINAPI *pNtSetLdtEntries)(ULONG,ULONG,ULONG,ULONG,ULONG,ULONG);
 
 static HANDLE create_target_process(const char *arg)
 {
@@ -1100,6 +1101,82 @@ static void test_SetThreadContext(void)
     CloseHandle( thread );
 }
 
+static void test_NtSetLdtEntries(void)
+{
+    THREAD_DESCRIPTOR_INFORMATION tdi;
+    LDT_ENTRY ds_entry;
+    CONTEXT ctx;
+    DWORD ret;
+    union
+    {
+        LDT_ENTRY entry;
+        DWORD dw[2];
+    } sel;
+
+    if (!pNtSetLdtEntries)
+    {
+        win_skip("NtSetLdtEntries is not available on this platform\n");
+        return;
+    }
+
+    if (pNtSetLdtEntries(0, 0, 0, 0, 0, 0) == STATUS_NOT_IMPLEMENTED) /* WoW64 */
+    {
+        win_skip("NtSetLdtEntries is not implemented on this platform\n");
+        return;
+    }
+
+    ret = pNtSetLdtEntries(0, 0, 0, 0, 0, 0);
+    ok(!ret, "NtSetLdtEntries failed: %08x\n", ret);
+
+    ctx.ContextFlags = CONTEXT_SEGMENTS;
+    ret = GetThreadContext(GetCurrentThread(), &ctx);
+    ok(ret, "GetThreadContext failed\n");
+
+    tdi.Selector = ctx.SegDs;
+    ret = pNtQueryInformationThread(GetCurrentThread(), 6 /*ThreadDescriptorTableEntry*/, &tdi, sizeof(tdi), &ret);
+    ok(!ret, "NtQueryInformationThread failed: %08x\n", ret);
+    ds_entry = tdi.Entry;
+
+    tdi.Selector = 0x000f;
+    ret = pNtQueryInformationThread(GetCurrentThread(), 6 /*ThreadDescriptorTableEntry*/, &tdi, sizeof(tdi), &ret);
+    ok(ret == STATUS_ACCESS_VIOLATION, "got %08x\n", ret);
+
+    tdi.Selector = 0x001f;
+    ret = pNtQueryInformationThread(GetCurrentThread(), 6 /*ThreadDescriptorTableEntry*/, &tdi, sizeof(tdi), &ret);
+    ok(ret == STATUS_ACCESS_VIOLATION, "NtQueryInformationThread returned %08x\n", ret);
+
+    ret = GetThreadSelectorEntry(GetCurrentThread(), 0x000f, &sel.entry);
+    ok(!ret, "GetThreadSelectorEntry should fail\n");
+
+    ret = GetThreadSelectorEntry(GetCurrentThread(), 0x001f, &sel.entry);
+    ok(!ret, "GetThreadSelectorEntry should fail\n");
+
+    memset(&sel.entry, 0x9a, sizeof(sel.entry));
+    ret = GetThreadSelectorEntry(GetCurrentThread(), ctx.SegDs, &sel.entry);
+    ok(ret, "GetThreadSelectorEntry failed\n");
+    ok(!memcmp(&ds_entry, &sel.entry, sizeof(ds_entry)), "entries do not match\n");
+
+    ret = pNtSetLdtEntries(0x000f, sel.dw[0], sel.dw[1], 0x001f, sel.dw[0], sel.dw[1]);
+    ok(!ret || broken(ret == STATUS_INVALID_LDT_DESCRIPTOR) /*XP*/, "NtSetLdtEntries failed: %08x\n", ret);
+
+    if (!ret)
+    {
+        memset(&sel.entry, 0x9a, sizeof(sel.entry));
+        ret = GetThreadSelectorEntry(GetCurrentThread(), 0x000f, &sel.entry);
+        todo_wine
+        ok(ret, "GetThreadSelectorEntry failed\n");
+        todo_wine
+        ok(!memcmp(&ds_entry, &sel.entry, sizeof(ds_entry)), "entries do not match\n");
+
+        memset(&sel.entry, 0x9a, sizeof(sel.entry));
+        ret = GetThreadSelectorEntry(GetCurrentThread(), 0x001f, &sel.entry);
+        todo_wine
+        ok(ret, "GetThreadSelectorEntry failed\n");
+        todo_wine
+        ok(!memcmp(&ds_entry, &sel.entry, sizeof(ds_entry)), "entries do not match\n");
+    }
+}
+
 #endif  /* __i386__ */
 
 static HANDLE finish_event;
@@ -1913,6 +1990,7 @@ static void init_funcs(void)
        X(NtQueryInformationThread);
        X(RtlGetThreadErrorMode);
        X(NtSetInformationThread);
+       X(NtSetLdtEntries);
    }
 #undef X
 }
@@ -1965,6 +2043,7 @@ START_TEST(thread)
    test_GetThreadExitCode();
 #ifdef __i386__
    test_SetThreadContext();
+   test_NtSetLdtEntries();
 #endif
    test_QueueUserWorkItem();
    test_RegisterWaitForSingleObject();
diff --git a/dlls/ntdll/nt.c b/dlls/ntdll/nt.c
index 3f5ae2c..fbea627 100644
--- a/dlls/ntdll/nt.c
+++ b/dlls/ntdll/nt.c
@@ -56,6 +56,7 @@
 #include "winternl.h"
 #include "ntdll_misc.h"
 #include "wine/server.h"
+#include "wine/library.h"
 #include "ddk/wdm.h"
 
 #ifdef __APPLE__
@@ -2790,7 +2791,32 @@ NTSTATUS WINAPI NtSystemDebugControl(SYSDBG_COMMAND command, PVOID inbuffer, ULO
 NTSTATUS WINAPI NtSetLdtEntries(ULONG selector1, ULONG entry1_low, ULONG entry1_high,
                                 ULONG selector2, ULONG entry2_low, ULONG entry2_high)
 {
-    FIXME("(%u, %u, %u, %u, %u, %u): stub\n", selector1, entry1_low, entry1_high, selector2, entry2_low, entry2_high);
+#ifdef __i386__
+    union
+    {
+        LDT_ENTRY entry;
+        ULONG dw[2];
+    } sel;
+
+    TRACE("(%x,%x,%x,%x,%x,%x)\n", selector1, entry1_low, entry1_high, selector2, entry2_low, entry2_high);
 
+    if (selector1)
+    {
+        sel.dw[0] = entry1_low;
+        sel.dw[1] = entry1_high;
+        if (wine_ldt_set_entry(selector1, &sel.entry) < 0)
+            return STATUS_ACCESS_DENIED;
+    }
+    if (selector2)
+    {
+        sel.dw[0] = entry2_low;
+        sel.dw[1] = entry2_high;
+        if (wine_ldt_set_entry(selector2, &sel.entry) < 0)
+            return STATUS_ACCESS_DENIED;
+    }
+    return STATUS_SUCCESS;
+#else
+    FIXME("(%x,%x,%x,%x,%x,%x): stub\n", selector1, entry1_low, entry1_high, selector2, entry2_low, entry2_high);
     return STATUS_NOT_IMPLEMENTED;
+#endif
 }
-- 
2.8.0