SEH in a kernel mode driver?

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yoshimitsu

Joined: 07 Jul 2011
Posts: 96

yoshimitsu 05 Sep 2011, 15:32

Hey,
as I don't have any VM installed and as I'm not experienced with neither the kernel mode nor SEH, either, I thought it'd be easier to just ask here.

I've read somewhere you could normally use SEH in a kernel mode driver.
But I get a BSoD when executing the following code:

Code:

        push    exception_handler
        push    dword [fs:0]
        mov     [fs:0],esp
        mov     [0],eax
        jmp     skip
    exception_handler:
        mov     esp,[esp+8]
    skip:
        pop     dword [fs:0]
        add     esp,4

05 Sep 2011, 15:32

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 05 Sep 2011, 16:12

http://flatassembler.net/examples/seh_example.zip
http://www.microsoft.com/msj/0197/exception/exception.aspx

But in short, I think you are doing wrong in trying to continue instead of having a exception_handler procedure which returns to its real caller (and adjust CONTEXT.EIP to bypass the buggy instruction).

05 Sep 2011, 16:12

yoshimitsu

Joined: 07 Jul 2011
Posts: 96

yoshimitsu 05 Sep 2011, 19:45

in ring3 it works as after reaching the faulty code execution continues at exception_handler where the stack gets corrected which is why execution goes on normally

05 Sep 2011, 19:45

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