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- Don't perform event check if in system code. Fixes infinite 

recursion bug.
- Fix stack corruption that could occur in K32WowCallback16Ex if an
  event check was inserted.
This commit is contained in:
Robert Shearman 2004-09-28 19:18:06 +00:00 committed by Alexandre Julliard
parent fd306fb5d1
commit 240c02bbfe
1 changed files with 17 additions and 7 deletions
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24
dlls/kernel/wowthunk.c
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@ -194,6 +194,10 @@ static void insert_event_check( CONTEXT *context )
{
char *stack = wine_ldt_get_ptr( context->SegSs, context->Esp );
/* don't do event check while in system code */
if (wine_ldt_is_system(context->SegCs))
return;
if(context->SegCs == dpmi_checker_selector &&
context->Eip >= dpmi_checker_offset_call &&
context->Eip <= dpmi_checker_offset_cleanup)
@ -598,7 +602,7 @@ BOOL WINAPI K32WOWCallback16Ex( DWORD vpfn16, DWORD dwFlags,
* (both for PASCAL and CDECL calling convention), so we simply
* copy them to the 16-bit stack ...
*/
WORD *stack = (WORD *)CURRENT_STACK16 - cbArgs / sizeof(WORD);
char *stack = (char *)CURRENT_STACK16 - cbArgs;
memcpy( stack, pArgs, cbArgs );
@ -609,11 +613,12 @@ BOOL WINAPI K32WOWCallback16Ex( DWORD vpfn16, DWORD dwFlags,
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
DPRINTF("%04lx:CallTo16(func=%04lx:%04x,ds=%04lx",
GetCurrentThreadId(),
context->SegCs, LOWORD(context->Eip), context->SegDs );
while (count) DPRINTF( ",%04x", stack[--count] );
while (count) DPRINTF( ",%04x", wstack[--count] );
DPRINTF(") ss:sp=%04x:%04x",
SELECTOROF(NtCurrentTeb()->cur_stack), OFFSETOF(NtCurrentTeb()->cur_stack) );
DPRINTF(" ax=%04x bx=%04x cx=%04x dx=%04x si=%04x di=%04x bp=%04x es=%04x fs=%04x\n",
@ -636,13 +641,16 @@ BOOL WINAPI K32WOWCallback16Ex( DWORD vpfn16, DWORD dwFlags,
/* push return address */
if (dwFlags & WCB16_REGS_LONG)
{
*((DWORD *)stack - 1) = HIWORD(call16_ret_addr);
*((DWORD *)stack - 2) = LOWORD(call16_ret_addr);
stack -= sizeof(DWORD);
*((DWORD *)stack) = HIWORD(call16_ret_addr);
stack -= sizeof(DWORD);
*((DWORD *)stack) = LOWORD(call16_ret_addr);
cbArgs += 2 * sizeof(DWORD);
}
else
{
*((SEGPTR *)stack - 1) = call16_ret_addr;
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
}
@ -682,18 +690,20 @@ BOOL WINAPI K32WOWCallback16Ex( DWORD vpfn16, DWORD dwFlags,
if (TRACE_ON(relay))
{
DWORD count = cbArgs / sizeof(WORD);
WORD * wstack = (WORD *)stack;
DPRINTF("%04lx:CallTo16(func=%04x:%04x,ds=%04x",
GetCurrentThreadId(), HIWORD(vpfn16), LOWORD(vpfn16),
SELECTOROF(NtCurrentTeb()->cur_stack) );
while (count) DPRINTF( ",%04x", stack[--count] );
while (count) DPRINTF( ",%04x", wstack[--count] );
DPRINTF(") ss:sp=%04x:%04x\n",
SELECTOROF(NtCurrentTeb()->cur_stack), OFFSETOF(NtCurrentTeb()->cur_stack) );
SYSLEVEL_CheckNotLevel( 2 );
}
/* push return address */
*((SEGPTR *)stack - 1) = call16_ret_addr;
stack -= sizeof(SEGPTR);
*((SEGPTR *)stack) = call16_ret_addr;
cbArgs += sizeof(SEGPTR);
/*