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Merge "dev devices with permissive boot: disable perf_event_paranoid"

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Ryan Savitski 2020-10-30 17:48:04 +00:00 committed by Gerrit Code Review
commit 3b268df195
1 changed files with 14 additions and 0 deletions
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14
init/security.cpp
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@ -19,6 +19,7 @@
#include <errno.h>
#include <fcntl.h>
#include <linux/perf_event.h>
#include <selinux/selinux.h>
#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <unistd.h>
@ -222,6 +223,19 @@ Result<void> SetKptrRestrictAction(const BuiltinArguments&) {
// supporting kernels that precede the perf_event_open hooks (Android common
// kernels 4.4 and 4.9).
Result<void> 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,