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authorDaniel Micay <danielmicay@gmail.com>2015-09-04 16:23:01 -0400
committerJeff Vander Stoep <jeffv@google.com>2016-06-01 16:58:48 -0700
commitfe01f56c0d5c42508e1e82f5976e4c10bb00f632 (patch)
tree7d81fbab5bf86c98c63ab37b849e6121df4843dc /rootdir
parent0eb24e1bc7317eb5764567223cdd9405d16aefa7 (diff)
add a property for controlling perf_event_paranoid
(Cherry picked from commit 2b22a66382db8a2fdf5ed7a685085a6d7d67cf12) 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. Bug: 29054680 Change-Id: I6e3ae3cf18d8c76df94f879c34fb6fde519b89a9
Diffstat (limited to 'rootdir')
-rw-r--r--rootdir/init.rc5
1 files changed, 5 insertions, 0 deletions
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 00b9844b6..3466dce0c 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -603,6 +603,11 @@ on property:sys.sysctl.extra_free_kbytes=*
on property:sys.sysctl.tcp_def_init_rwnd=*
write /proc/sys/net/ipv4/tcp_default_init_rwnd ${sys.sysctl.tcp_def_init_rwnd}
+on property:security.perf_harden=0
+ write /proc/sys/kernel/perf_event_paranoid 1
+
+on property:security.perf_harden=1
+ write /proc/sys/kernel/perf_event_paranoid 3
## Daemon processes to be run by init.
##