From: Oleg Nesterov <oleg@redhat.com>
Date: Fri, 23 Nov 2012 19:15:17 +0000 (+0100)
Subject: uprobes: _register() should always do register_for_each_vma(true)
X-Git-Tag: v3.9-rc1~173^2~2^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a98e03cc145c994da824dac7602334f50feb670;p=pandora-kernel.git

uprobes: _register() should always do register_for_each_vma(true)

To support the filtering uprobe_register() should do
register_for_each_vma(true) every time the new consumer comes,
we need to install the previously nacked breakpoints.

Note:
	- uprobes_mutex[] should die, what it actually protects is
	  alloc_uprobe().

	- UPROBE_RUN_HANDLER should die too, obviously it can't work
	  unless uprobe has a single consumer. The consumer should
	  serialize with _register/_unregister itself. Or this flag
	  should live in uprobe_consumer->state.

	- Perhaps we can do some optimizations later. For example, if
	  filter_chain() never returns false uprobe can record this
	  fact and avoid the unnecessary register_for_each_vma().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
---

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