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ntdll: Add a helper function to grow the stack on guard page faults. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2020-07-15 10:28:57 +02:00
parent 432d504118
commit f1e4c54104
1 changed files with 28 additions and 18 deletions
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46
dlls/ntdll/unix/virtual.c
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@ -2844,6 +2844,33 @@ void virtual_map_user_shared_data(void)
}
/***********************************************************************
* grow_thread_stack
*/
static NTSTATUS grow_thread_stack( char *page )
{
NTSTATUS ret = 0;
size_t guaranteed = max( NtCurrentTeb()->GuaranteedStackBytes, page_size * (is_win64 ? 2 : 1) );
set_page_vprot_bits( page, page_size, 0, VPROT_GUARD );
mprotect_range( page, page_size, 0, 0 );
if (page >= (char *)NtCurrentTeb()->DeallocationStack + page_size + guaranteed)
{
set_page_vprot_bits( page - page_size, page_size, VPROT_COMMITTED | VPROT_GUARD, 0 );
mprotect_range( page - page_size, page_size, 0, 0 );
}
else /* inside guaranteed space -> overflow exception */
{
page = (char *)NtCurrentTeb()->DeallocationStack + page_size;
set_page_vprot_bits( page, guaranteed, VPROT_COMMITTED, VPROT_GUARD );
mprotect_range( page, guaranteed, 0, 0 );
ret = STATUS_STACK_OVERFLOW;
}
NtCurrentTeb()->Tib.StackLimit = page;
return ret;
}
/***********************************************************************
* virtual_handle_fault
*/
@ -3045,24 +3072,7 @@ int virtual_handle_stack_fault( void *addr )
pthread_mutex_lock( &virtual_mutex ); /* no need for signal masking inside signal handler */
if (get_page_vprot( addr ) & VPROT_GUARD)
{
size_t guaranteed = max( NtCurrentTeb()->GuaranteedStackBytes, page_size * (is_win64 ? 2 : 1) );
char *page = ROUND_ADDR( addr, page_mask );
set_page_vprot_bits( page, page_size, 0, VPROT_GUARD );
mprotect_range( page, page_size, 0, 0 );
if (page >= (char *)NtCurrentTeb()->DeallocationStack + page_size + guaranteed)
{
set_page_vprot_bits( page - page_size, page_size, VPROT_COMMITTED | VPROT_GUARD, 0 );
mprotect_range( page - page_size, page_size, 0, 0 );
ret = 1;
}
else /* inside guaranteed space -> overflow exception */
{
page = (char *)NtCurrentTeb()->DeallocationStack + page_size;
set_page_vprot_bits( page, guaranteed, VPROT_COMMITTED, VPROT_GUARD );
mprotect_range( page, guaranteed, 0, 0 );
ret = -1;
}
NtCurrentTeb()->Tib.StackLimit = page;
ret = grow_thread_stack( ROUND_ADDR( addr, page_mask )) ? -1 : 1;
}
pthread_mutex_unlock( &virtual_mutex );
return ret;