Re: [PATCH 08/12] add trace events for each syscall entry/exit

H. Peter Anvin
2009-08-26T17:29:59Z

On 08/26/2009 12:10 AM, Peter Zijlstra wrote:
> On Tue, 2009-08-25 at 14:31 -0400, Mathieu Desnoyers wrote:
>> For instance, some
>> proprietary Linux driver does very odd things with system calls within
>> kernel threads, like invoking them with int 0x80.
>
> So who is going to send the x86 patch to make int 0x80 from kernel space
> panic the machine? :-)

Panicing might be a pretty darn good idea, since $DEITY knows what state
your stacks are in at that point, and if it is about to overflow.

... besides all the other evilness that entails.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.