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ntdll: Add a helper function to check that a fault address lies in a known virtual memory view.

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This commit is contained in:
Alexandre Julliard 2013-02-12 19:56:08 +01:00
parent 88367a3c58
commit 99d89b347f
3 changed files with 20 additions and 0 deletions
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1
dlls/ntdll/ntdll_misc.h
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@ -166,6 +166,7 @@ extern NTSTATUS virtual_create_builtin_view( void *base ) DECLSPEC_HIDDEN;
extern NTSTATUS virtual_alloc_thread_stack( TEB *teb, SIZE_T reserve_size, SIZE_T commit_size ) DECLSPEC_HIDDEN;
extern void virtual_clear_thread_stack(void) DECLSPEC_HIDDEN;
extern BOOL virtual_handle_stack_fault( void *addr ) DECLSPEC_HIDDEN;
extern BOOL virtual_is_valid_code_address( const void *addr, SIZE_T size ) DECLSPEC_HIDDEN;
extern NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err ) DECLSPEC_HIDDEN;
extern BOOL virtual_check_buffer_for_read( const void *ptr, SIZE_T size ) DECLSPEC_HIDDEN;
extern BOOL virtual_check_buffer_for_write( void *ptr, SIZE_T size ) DECLSPEC_HIDDEN;

2
dlls/ntdll/signal_i386.c
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@ -1528,6 +1528,8 @@ static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
const struct atl_thunk *thunk = (const struct atl_thunk *)rec->ExceptionInformation[1];
BOOL ret = FALSE;
if (!virtual_is_valid_code_address( thunk, sizeof(thunk) )) return FALSE;
__TRY
{
if (thunk->movl == 0x042444c7 && thunk->jmp == 0xe9)

17
dlls/ntdll/virtual.c
View File

@ -1616,6 +1616,23 @@ NTSTATUS virtual_handle_fault( LPCVOID addr, DWORD err )
/***********************************************************************
* virtual_is_valid_code_address
*/
BOOL virtual_is_valid_code_address( const void *addr, SIZE_T size )
{
struct file_view *view;
BOOL ret = FALSE;
sigset_t sigset;
server_enter_uninterrupted_section( &csVirtual, &sigset );
if ((view = VIRTUAL_FindView( addr, size )))
ret = !(view->protect & VPROT_SYSTEM); /* system views are not visible to the app */
server_leave_uninterrupted_section( &csVirtual, &sigset );
return ret;
}
/***********************************************************************
* virtual_handle_stack_fault
*