tree eb21eb1dce912d920b6ba6bdd548b6d7fe9686be
parent f189e5fff95e8fd7ee7497881d8106752032fb3d
author Daniel Micay <danielmicay@gmail.com> 1441398181 -0400
committer The Android Automerger <android-build@google.com> 1466722233 -0700

add a property for controlling perf_event_paranoid

This adds a system property for controlling unprivileged access to
perf_event_paranoid. It depends on adding kernel support for
perf_event_paranoid=3 based on grsecurity's PERF_HARDEN feature to
completely disable unprivileged access to perf. A minimal port of this
feature is used in the vanilla Debian kernel by default.

It hides the non-hardened value as an implementation detail, since while
it is currently 1, it will probably become 2 in the future.

(Cherry picked from commit 2b22a66382db8a2fdf5ed7a685085a6d7d67cf12)

Bug: 29054680

Change-Id: I6e3ae3cf18d8c76df94f879c34fb6fde519b89a9