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[NTUSER] Implement BroadcastSystemMessage with 'Environment' parameter (#6884)

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* [NTUSER] Implement BroadcastSystemMessage with 'Environment' parameter

CORE-19372
CORE-19583

* Changes based on reviewer comments.

* Make sure that lParamMsg has a UNICODE_NULL in it.

* Skip extra handling of 1 word messsages.
This commit is contained in:
Doug Lyons 2024-08-04 02:53:04 -05:00 committed by GitHub
parent fdc1d96dc1
commit 90de2b660b
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1 changed files with 65 additions and 3 deletions
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68
win32ss/user/ntuser/message.c
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@ -13,8 +13,30 @@ DBG_DEFAULT_CHANNEL(UserMsg);
#define PM_BADMSGFLAGS ~((QS_RAWINPUT << 16)|PM_QS_SENDMESSAGE|PM_QS_PAINT|PM_QS_POSTMESSAGE|PM_QS_INPUT|PM_NOYIELD|PM_REMOVE)
/* Strings that are OK to pass between user and kernel mode.
* There may be other strings needed that can easily be added here. */
WCHAR StrUserKernel[3][20] = {{L"intl"}, {L"Environment"}, {L"Policy"}};
/* FUNCTIONS *****************************************************************/
/* PosInArray checks for strings that can pass between user and kernel mode.
* See: https://learn.microsoft.com/en-us/windows/win32/winmsg/wm-settingchange
* It mentions 'Environment', 'intl', and 'Policy'.
* These strings are enumerated in the StrUserKernel definition.
* Returns: A positive integer indicating its position in the array if the
* string is found, or returns a minus one (-1) if the string is not found. */
static INT PosInArray(_In_ PCWSTR String)
{
INT i;
for (i = 0; i < ARRAYSIZE(StrUserKernel); ++i)
{
if (wcsncmp(String, StrUserKernel[i], _countof(StrUserKernel[0])) == 0)
return i;
}
return -1;
}
NTSTATUS FASTCALL
IntInitMessageImpl(VOID)
{
@ -431,7 +453,7 @@ CopyMsgToKernelMem(MSG *KernelModeMsg, MSG *UserModeMsg, PMSGMEMORY MsgMemoryEnt
NTSTATUS Status;
PVOID KernelMem;
UINT Size;
UINT Size, i;
*KernelModeMsg = *UserModeMsg;
@ -460,8 +482,42 @@ CopyMsgToKernelMem(MSG *KernelModeMsg, MSG *UserModeMsg, PMSGMEMORY MsgMemoryEnt
if (0 != (MsgMemoryEntry->Flags & MMS_FLAG_READ))
{
TRACE("Copy Message %u from usermode buffer\n", KernelModeMsg->message);
Status = MmCopyFromCaller(KernelMem, (PVOID) UserModeMsg->lParam, Size);
if (! NT_SUCCESS(Status))
/* Don't do extra testing for 1 word messages. For examples see
* https://wiki.winehq.org/List_Of_Windows_Messages. */
if (Size > 1)
{
WCHAR lParamMsg[_countof(StrUserKernel[0]) + 1] = { 0 };
_SEH2_TRY
{
if (UserModeMsg->lParam)
RtlCopyMemory(lParamMsg, (WCHAR*)UserModeMsg->lParam, sizeof(lParamMsg));
/* Make sure that the last WCHAR is a UNICODE_NULL */
for (i = 0; i < ARRAYSIZE(lParamMsg); ++i)
{
if (lParamMsg[i] == 0)
break;
}
/* If we did not find a UNICODE_NULL, then set last WCHAR to one */
if (i == ARRAYSIZE(lParamMsg))
lParamMsg[_countof(StrUserKernel[0])] = UNICODE_NULL;
}
_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
{
_SEH2_YIELD(return STATUS_ACCESS_VIOLATION);
}
_SEH2_END;
if (UserModeMsg->lParam && !UserModeMsg->wParam &&
PosInArray(lParamMsg) >= 0)
{
TRACE("Copy String '%S' from usermode buffer\n", lParamMsg);
wcscpy(KernelMem, lParamMsg);
return STATUS_SUCCESS;
}
}
Status = MmCopyFromCaller(KernelMem, (PVOID)UserModeMsg->lParam, Size);
if (!NT_SUCCESS(Status))
{
ERR("Failed to copy message to kernel: invalid usermode lParam buffer\n");
ExFreePoolWithTag(KernelMem, TAG_MSG);
@ -2721,6 +2777,12 @@ NtUserMessageCall( HWND hWnd,
}
ExFreePoolWithTag(List, USERTAG_WINDOWLIST);
}
if (lParam && !wParam && wcsicmp((WCHAR*)lParam, L"Environment") == 0)
{
/* Handle Broadcast of WM_SETTINGCHAGE for Environment */
co_IntDoSendMessage(HWND_BROADCAST, WM_SETTINGCHANGE,
0, (LPARAM)L"Environment", 0);
}
Ret = TRUE;
}
}