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Unprotect the resource data in the unhandled exception handler to fix 

broken apps.
This commit is contained in:
Alexandre Julliard 2002-08-09 20:01:00 +00:00
parent a5dea216cc
commit f507278769
1 changed files with 29 additions and 0 deletions
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29
win32/except.c
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@ -359,6 +359,33 @@ static int start_debugger_atomic(PEXCEPTION_POINTERS epointers)
} }
/*******************************************************************
* check_resource_write
*
* Check if the exception is a write attempt to the resource data.
* If yes, we unprotect the resources to let broken apps continue
* (Windows does this too).
*/
inline static BOOL check_resource_write( const EXCEPTION_RECORD *rec )
{
void *addr, *rsrc;
DWORD size;
MEMORY_BASIC_INFORMATION info;
if (rec->ExceptionCode != EXCEPTION_ACCESS_VIOLATION) return FALSE;
if (!rec->ExceptionInformation[0]) return FALSE; /* not a write access */
addr = (void *)rec->ExceptionInformation[1];
if (!VirtualQuery( addr, &info, sizeof(info) )) return FALSE;
if (!(rsrc = RtlImageDirectoryEntryToData( (HMODULE)info.AllocationBase, TRUE,
IMAGE_DIRECTORY_ENTRY_RESOURCE, &size )))
return FALSE;
if (addr < rsrc || (char *)addr >= (char *)rsrc + size) return FALSE;
FIXME( "Broken app is writing to the resource data, enabling work-around\n" );
VirtualProtect( rsrc, size, PAGE_WRITECOPY, NULL );
return TRUE;
}
/******************************************************************* /*******************************************************************
* UnhandledExceptionFilter (KERNEL32.@) * UnhandledExceptionFilter (KERNEL32.@)
*/ */
@ -367,6 +394,8 @@ DWORD WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS epointers)
int status; int status;
int loop = 0; int loop = 0;
if (check_resource_write( epointers->ExceptionRecord )) return EXCEPTION_CONTINUE_EXECUTION;
for (loop = 0; loop <= 1; loop++) for (loop = 0; loop <= 1; loop++)
{ {
/* send a last chance event to the debugger */ /* send a last chance event to the debugger */