OllyDbg pass exception

[vozzie]

Hy,

When using OllyDbg i let my program run(step over) parts but ollydbg breaks in kernel32.dll, saying press "Exception 00000006 - use Shift+F7/F8/F9 to pass exception to program". When i hit SHIFT+F9 nothing goes wrong. When i run the program with no debugger, nothing goes wrong.

Do i need to conclude
- i pass somewhere wrong data, but the exception is not serious?
- that it's an internal exception in kernel32 that i should not worry about?
- something else?

Windows error code 6 stands for ERROR_INVALID_HANDLE 6 (0x6)

There's too much discussion on the topic to find something usefull on first sight. I tried to turn on all "ignore" exceptions, i could add the exception explicit in ollydbg. I'm just not sure if the program is buggy

Greetings

[Tedd]

It would be helpful to know which API function you're calling when this happens, but some will produce exceptions internally and handle them themselves. So, if you don't receive the exception (outside of debugging), you can assume it has been taken care of and all is well.

[vozzie]

Hy,

Thank you.

It was WSALookupServiceBegin that led to an error in kernel32. My application runs good when passing the exception to the program. Or running with no debugger. Looks like OllyDbg catches a bit too much  :green2. That can be usefull, but I just want to debug my programs, so only the "top layer".

It's possible to ignore certain exceptions in OllyDbg, but i wonder if that is a good way of working.

Greetings

[jj2007]

It's possible to ignore certain exceptions in OllyDbg, but i wonder if that is a good way of working.

Try "Ignore memory access violations in KERNEL32". Olly 2 has also an option "Report ignored exceptions to log".
In rare occasions, version 2 produces different results; especially the contents of regs at startup may differ (but no programmer should rely on any values in registers at entry point, of course).

[vozzie]

It would be helpful to know which API function you're calling when this happens,

I posted the project there: http://www.masm32.com/board/index.php?topic=14997.new

[vozzie]

It's possible to ignore certain exceptions in OllyDbg, but i wonder if that is a good way of working.

Try "Ignore memory access violations in KERNEL32". Olly 2 has also an option "Report ignored exceptions to log".

using version 1.10  ::)

The ignore memory access violations doesn't work for error 6. On the moment OllyDbg breaks I've Added Last Exception in the Debugging Options tab and after a second time he didn't break anymore. There's a convenient checkbox to turn the Ignored exceptions off,...

Greetings

(wanted to modify the previous post and by accident added another one, is there a way to delete posts?)

[Antariy]

It's possible to ignore certain exceptions in OllyDbg, but i wonder if that is a good way of working.

Try "Ignore memory access violations in KERNEL32". Olly 2 has also an option "Report ignored exceptions to log".

using version 1.10  ::)

Hi!

You can download version 2.0 there: "http://www.ollydbg.de/version2.html". It more robust than 1.10, with multi-threaded apps too.



Alex

[jj2007]

Alex is right, version 2 is apparently more robust. Its only problem is that it cannot yet use symbols.

[vozzie]

Hy,

Thx, have them both now. As far as i'm going in asm now i don't need many features.

Greetings