commit 97e3bb3a948e407a1ec364401719121ec379ff6e
author Yabin Cui <yabinc@google.com> Fri Nov 02 15:22:13 2018 -0700
committer Yabin Cui <yabinc@google.com> Tue Nov 06 15:31:59 2018 -0800
tree fc1df6324d76abf43408570327ae08955c5ae966
parent a97d6e36d5e3902d52d258ec0ec76d21c481ffed

run-as: add ":fromRunAs" selector in seinfo.

It notifies libselinux that the setcontext request is from run-as.
And libselinux will set current process to runas_app domain, which
can execute app data files.

Bug: 118737210
Test: run CtsSimpleperfTestCases.
Change-Id: Ib94087f910786dd5d2a2b2e3b1bf76dfa7131ced

run-as/run-as.cpp

diff --git a/run-as/run-as.cpp b/run-as/run-as.cpp
index 971b9f4e..f49bdf7 100644
--- a/run-as/run-as.cpp
+++ b/run-as/run-as.cpp
@@ -25,6 +25,8 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <string>
+
 #include <libminijail.h>
 #include <scoped_minijail.h>
 
@@ -214,7 +216,8 @@
   minijail_keep_supplementary_gids(j.get());
   minijail_enter(j.get());
 
-  if (selinux_android_setcontext(uid, 0, info.seinfo, pkgname) < 0) {
+  std::string seinfo = std::string(info.seinfo) + ":fromRunAs";
+  if (selinux_android_setcontext(uid, 0, seinfo.c_str(), pkgname) < 0) {
     error(1, errno, "couldn't set SELinux security context");
   }