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ntdll: Force execute permission again on the stack after clearing it.

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This commit is contained in:
Alexandre Julliard 2008-06-26 21:10:57 +02:00
parent 6e9a6577c3
commit 58d076b419
3 changed files with 17 additions and 5 deletions
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6
dlls/ntdll/loader.c
View File

@ -2423,11 +2423,7 @@ void WINAPI LdrInitializeThunk( ULONG unknown1, ULONG unknown2, ULONG unknown3,
status = wine_call_on_stack( attach_process_dlls, wm, NtCurrentTeb()->Tib.StackBase );
if (status != STATUS_SUCCESS) goto error;
/* clear the stack contents before calling the main entry point, some broken apps need that */
wine_anon_mmap( NtCurrentTeb()->Tib.StackLimit,
(char *)NtCurrentTeb()->Tib.StackBase - (char *)NtCurrentTeb()->Tib.StackLimit,
PROT_READ | PROT_WRITE, MAP_FIXED );
virtual_clear_thread_stack();
if (nt->FileHeader.Characteristics & IMAGE_FILE_LARGE_ADDRESS_AWARE) VIRTUAL_UseLargeAddressSpace();
return;

1
dlls/ntdll/ntdll_misc.h
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@ -134,6 +134,7 @@ extern unsigned int DIR_get_drives_info( struct drive_info info[MAX_DOS_DRIVES]
/* virtual memory */
extern NTSTATUS virtual_alloc_thread_stack( void *base, SIZE_T stack_size );
extern void virtual_clear_thread_stack(void);
extern BOOL virtual_handle_stack_fault( void *addr );
extern NTSTATUS VIRTUAL_HandleFault(LPCVOID addr);
extern void VIRTUAL_SetForceExec( BOOL enable );

15
dlls/ntdll/virtual.c
View File

@ -1242,6 +1242,21 @@ done:
}
/***********************************************************************
* virtual_clear_thread_stack
*
* Clear the stack contents before calling the main entry point, some broken apps need that.
*/
void virtual_clear_thread_stack(void)
{
void *stack = NtCurrentTeb()->Tib.StackLimit;
size_t size = (char *)NtCurrentTeb()->Tib.StackBase - (char *)NtCurrentTeb()->Tib.StackLimit;
wine_anon_mmap( stack, size, PROT_READ | PROT_WRITE, MAP_FIXED );
if (force_exec_prot) mprotect( stack, size, PROT_READ | PROT_WRITE | PROT_EXEC );
}
/***********************************************************************
* VIRTUAL_HandleFault
*/