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17 May 2024, 11:00:25 UTC
Revision c6c2401d8bbaf9edc189b4c35a8cb2780b8b988e authored by Steven Rostedt (Red Hat) on 04 July 2013, 03:33:51 UTC, committed by Steven Rostedt on 01 August 2013, 22:25:50 UTC 
tracing/uprobes: Fail to unregister if probe event files are in use
 
Uprobes suffer the same problem that kprobes have. There's a race between
writing to the "enable" file and removing the probe. The probe checks for
it being in use and if it is not, goes about deleting the probe and the
event that represents it. But the problem with that is, after it checks
if it is in use it can be enabled, and the deletion of the event (access
to the probe) will fail, as it is in use. But the uprobe will still be
deleted. This is a problem as the event can reference the uprobe that
was deleted.

The fix is to remove the event first, and check to make sure the event
removal succeeds. Then it is safe to remove the probe.

When the event exists, either ftrace or perf can enable the probe and
prevent the event from being removed.

Link: http://lkml.kernel.org/r/20130704034038.991525256@goodmis.org

Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
1 parent 40c3259
History
Tip revision: c6c2401d8bbaf9edc189b4c35a8cb2780b8b988e authored by Steven Rostedt (Red Hat) on 04 July 2013, 03:33:51 UTC
tracing/uprobes: Fail to unregister if probe event files are in use
Tip revision: c6c2401
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