On Thu, 16 Feb 2006, Chuck Ebbert wrote:
>
> Singlestep through a syscall using vsyscall-sysenter had two bugs:
>
> 1. Setting TIF_SINGLESTEP is not enough to force
> do_notify_resume() to be run on return to user;
> TIF_IRET must also be set.
Interesting, but I think you pinpointed the _real_ bug.
TIF_SINGLESTEP very much should be enough to force do_notify_resume() to
be run on return to user space.
Sounds like somebody is testing _TIF_WORK_MASK rather than
_TIF_ALLWORK_MASK.
I'd suspect the "work_pending" case. Looks like we miss testing the TIF
flags there.
Oh, actually, I think you should just remove the clearing of
_TIF_SINGLESTEP from _TIF_WORK_MASK. Does that fix the bug.
Linus
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