diff --git a/init/security.cpp b/init/security.cpp index 2450d654b..ac784a32a 100644 --- a/init/security.cpp +++ b/init/security.cpp @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -222,6 +223,19 @@ Result SetKptrRestrictAction(const BuiltinArguments&) { // supporting kernels that precede the perf_event_open hooks (Android common // kernels 4.4 and 4.9). Result TestPerfEventSelinuxAction(const BuiltinArguments&) { + // Special case: for *development devices* that boot with permissive + // SELinux, treat the LSM hooks as present for the effect of lowering the + // perf_event_paranoid sysctl. The sysprop is reused for pragmatic reasons, + // as there no existing way for init rules to check for permissive boot at + // the time of writing. + if (ALLOW_PERMISSIVE_SELINUX) { + if (!security_getenforce()) { + LOG(INFO) << "Permissive SELinux boot, forcing sys.init.perf_lsm_hooks to 1."; + SetProperty("sys.init.perf_lsm_hooks", "1"); + return {}; + } + } + // Use a trivial event that will be configured, but not started. struct perf_event_attr pe = { .type = PERF_TYPE_SOFTWARE,