* Peter Zijlstra <peterz@xxxxxxxxxxxxx> [2011-09-26 16:23:53]:
> On Tue, 2011-09-20 at 17:33 +0530, Srikar Dronamraju wrote:
> > +fail:
> > + pr_warn_once("uprobes: Failed to adjust return address after"
> > + " single-stepping call instruction;"
> > + " pid=%d, sp=%#lx\n", current->pid, sp);
> > + return -EFAULT;
>
> So how can that happen? Single-Step while someone unmapped the stack?
We do a copy_to_user, copy_from_user just above this, Now if either of
them fail, we have no choice but to Bail out. What caused this EFault
may not be under Uprobes's Control.
--
Thanks and Regards
Srikar
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>