uprobes: minor fixes + name the xol vma

[Oleg Nesterov]

Hello,

The bugs are theoretical, but still should be fixed imo. And it
would be nice to name the special vma installed by uprobes. As a
side effect this vma will be core-dump'ed, I think this is good.

This doesn't depend on the pending longjmp fixes.

Oleg.

 kernel/events/uprobes.c |   43 +++++++++++++++++++++++++++----------------
 1 files changed, 27 insertions(+), 16 deletions(-)

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