coresight: etm3x: Don't use contextID with PID namespaces

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Tracers can trigger trace acquisition based on contextID value, something
that isn't useful when PID namespaces are enabled.  Indeed the PID value
of a process has a different representation in the kernel and the PID
namespace, making the feature confusing and potentially leaking internal
kernel information.

As such simply return an error when the feature is being used from a
PID namespace other than the default one.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Kim Phillips <kim.phillips@arm.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Mathieu Poirier 2018-07-11 13:40:11 -06:00 • committed by Greg Kroah-Hartman

parent 5151e2b578

commit 7bd50ccf00

3 changed files with 38 additions and 12 deletions

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3

drivers/hwtracing/coresight/coresight-etm.h

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43

drivers/hwtracing/coresight/coresight-etm3x-sysfs.c

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4

drivers/hwtracing/coresight/coresight-etm3x.c

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