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Fetch the stack selector to use from the previous stackframe instead 

of the TEB.
This commit is contained in:
Alexandre Julliard 2005-06-06 19:57:05 +00:00
parent eba47f1dfe
commit 6ae4ee496e
1 changed files with 5 additions and 6 deletions
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11
dlls/kernel/thunk.c
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@ -34,7 +34,6 @@
#include "windef.h" #include "windef.h"
#include "winbase.h" #include "winbase.h"
#include "winerror.h" #include "winerror.h"
#include "thread.h"
#include "winreg.h" #include "winreg.h"
#include "winternl.h" #include "winternl.h"
#include "wownt32.h" #include "wownt32.h"
@ -1265,19 +1264,19 @@ void WINAPI __regs_K32Thk1632Prolog( CONTEXT86 *context )
if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
&& code[13] == 0x66 && code[14] == 0xCB) && code[13] == 0x66 && code[14] == 0xCB)
{ {
WORD stackSel = NtCurrentTeb()->stack_sel;
DWORD stackBase = GetSelectorBase(stackSel);
DWORD argSize = context->Ebp - context->Esp; DWORD argSize = context->Ebp - context->Esp;
char *stack16 = (char *)context->Esp - 4; char *stack16 = (char *)context->Esp - 4;
char *stack32 = (char *)NtCurrentTeb()->WOW32Reserved - argSize;
STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1; STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
STACK32FRAME *frame32 = (STACK32FRAME *)NtCurrentTeb()->WOW32Reserved;
char *stack32 = (char *)frame32 - argSize;
WORD stackSel = SELECTOROF(frame32->frame16);
DWORD stackBase = GetSelectorBase(stackSel);
TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n", TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved); context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
memset(frame16, '\0', sizeof(STACK16FRAME)); memset(frame16, '\0', sizeof(STACK16FRAME));
frame16->frame32 = NtCurrentTeb()->WOW32Reserved; frame16->frame32 = frame32;
frame16->ebp = context->Ebp; frame16->ebp = context->Ebp;
memcpy(stack32, stack16, argSize); memcpy(stack32, stack16, argSize);