[PATCH v9 2/2] ntdll/tests: Add NtAllocateVirtualMemory tests for zero_bits behavior

[Huw Davies]

From: Rémi Bernon <rbernon(a)codeweavers.com>

The zero_bits parameter doesn't behave as expected, and some 64bit code
use it to allocate memory in the lower 32bit address space.

The expected full behaviour is:

* zero_bits == 0: no constraint on address range
* 0 < zero_bits <= 15: returned address should have as many upper bits
                       set to 0, starting at bit 31. In 64bit mode,
                       upper 32bits should all be 0 as well.
* 15 < zero_bits <= 31: unsure, but probably same as zero_bits == 15.
* zero_bits > 31: (64bit/WoW64 only) zero_bits behaves as a bitmask, as
                  if it was set to the number of leading 0 in the
                  bitmask, works in the whole 64bit range.

Signed-off-by: Rémi Bernon <rbernon(a)codeweavers.com>
Signed-off-by: Huw Davies <huw(a)codeweavers.com>
---
 dlls/ntdll/tests/virtual.c | 77 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/dlls/ntdll/tests/virtual.c b/dlls/ntdll/tests/virtual.c
index c1b46c959e..195a54704f 100644
--- a/dlls/ntdll/tests/virtual.c
+++ b/dlls/ntdll/tests/virtual.c
@@ -26,11 +26,15 @@
 #include "winternl.h"
 #include "wine/test.h"
 
+static BOOL (WINAPI *pIsWow64Process)(HANDLE, PBOOL);
+
 static void test_AllocateVirtualMemory(void)
 {
     void *addr1, *addr2;
     NTSTATUS status;
     SIZE_T size;
+    ULONG zero_bits;
+    BOOL is_wow64;
 
     /* simple allocation should success */
     size = 0x1000;
@@ -60,6 +64,46 @@ static void test_AllocateVirtualMemory(void)
         ok(status == STATUS_SUCCESS, "NtFreeVirtualMemory return %08x, addr2: %p\n", status, addr2);
     }
 
+    /* 1 zero bits should zero 63-31 upper bits */
+    size = 0x1000;
+    addr2 = NULL;
+    zero_bits = 1;
+    status = NtAllocateVirtualMemory(NtCurrentProcess(), &addr2, 1, &size,
+                                     MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
+    ok(status == STATUS_SUCCESS || status == STATUS_NO_MEMORY ||
+       broken(status == STATUS_INVALID_PARAMETER_3) /* winxp */,
+       "NtAllocateVirtualMemory returned %08x\n", status);
+    if (status == STATUS_SUCCESS)
+    {
+        ok(((UINT_PTR)addr2 >> (32 - zero_bits)) == 0,
+           "NtAllocateVirtualMemory returned address: %p\n", addr2);
+
+        size = 0;
+        status = NtFreeVirtualMemory(NtCurrentProcess(), &addr2, &size, MEM_RELEASE);
+        ok(status == STATUS_SUCCESS, "NtFreeVirtualMemory return %08x, addr2: %p\n", status, addr2);
+    }
+
+    for (zero_bits = 2; zero_bits <= 20; zero_bits++)
+    {
+        size = 0x1000;
+        addr2 = NULL;
+        status = NtAllocateVirtualMemory(NtCurrentProcess(), &addr2, zero_bits, &size,
+                                         MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
+        ok(status == STATUS_SUCCESS || status == STATUS_NO_MEMORY ||
+           broken(zero_bits == 20 && status == STATUS_CONFLICTING_ADDRESSES) /* w1064v1809 */,
+           "NtAllocateVirtualMemory with %d zero_bits returned %08x\n", zero_bits, status);
+        if (status == STATUS_SUCCESS)
+        {
+            todo_wine_if((UINT_PTR)addr2 >> (32 - zero_bits))
+            ok(((UINT_PTR)addr2 >> (32 - zero_bits)) == 0,
+               "NtAllocateVirtualMemory with %d zero_bits returned address %p\n", zero_bits, addr2);
+
+            size = 0;
+            status = NtFreeVirtualMemory(NtCurrentProcess(), &addr2, &size, MEM_RELEASE);
+            ok(status == STATUS_SUCCESS, "NtFreeVirtualMemory return %08x, addr2: %p\n", status, addr2);
+        }
+    }
+
     /* 21 zero bits never succeeds */
     size = 0x1000;
     addr2 = NULL;
@@ -83,6 +127,35 @@ static void test_AllocateVirtualMemory(void)
     ok(status == STATUS_INVALID_PARAMETER_3 || status == STATUS_INVALID_PARAMETER,
        "NtAllocateVirtualMemory returned %08x\n", status);
 
+    /* zero bits > 31 should be considered as bitmask on 64bit and WoW64 */
+    size = 0x1000;
+    addr2 = NULL;
+    zero_bits = 0x1fffffff;
+    status = NtAllocateVirtualMemory(NtCurrentProcess(), &addr2, zero_bits, &size,
+                                      MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
+
+    if (sizeof(void *) == sizeof(int) && (!pIsWow64Process ||
+        !pIsWow64Process(NtCurrentProcess(), &is_wow64) || !is_wow64))
+    {
+        ok(status == STATUS_INVALID_PARAMETER_3, "NtAllocateVirtualMemory returned %08x\n", status);
+    }
+    else
+    {
+        todo_wine
+        ok(status == STATUS_SUCCESS || status == STATUS_NO_MEMORY,
+           "NtAllocateVirtualMemory returned %08x\n", status);
+        if (status == STATUS_SUCCESS)
+        {
+            todo_wine
+            ok(((UINT_PTR)addr2 & ~zero_bits) == 0,
+               "NtAllocateVirtualMemory returned address %p\n", addr2);
+
+            size = 0;
+            status = NtFreeVirtualMemory(NtCurrentProcess(), &addr2, &size, MEM_RELEASE);
+            ok(status == STATUS_SUCCESS, "NtFreeVirtualMemory return %08x, addr2: %p\n", status, addr2);
+        }
+    }
+
     /* AT_ROUND_TO_PAGE flag is not supported for NtAllocateVirtualMemory */
     size = 0x1000;
     addr2 = (char *)addr1 + 0x1000;
@@ -99,6 +172,10 @@ static void test_AllocateVirtualMemory(void)
 START_TEST(virtual)
 {
     SYSTEM_BASIC_INFORMATION sbi;
+    HMODULE hkernel32;
+
+    hkernel32 = GetModuleHandleA("kernel32.dll");
+    pIsWow64Process = (void *)GetProcAddress(hkernel32, "IsWow64Process");
 
     NtQuerySystemInformation(SystemBasicInformation, &sbi, sizeof(sbi), NULL);
     trace("system page size %#x\n", sbi.PageSize);
-- 
2.17.1