rild: enable tombstone on RIL crash

Since Android L, process dumpable flag is verified in case of
crash before requesting tombstone capture by debuggerd.
As setuid operation clears dumpable flag for a process, reenable
flag in rild after its switch to UID radio (debuggable build only)

Change-Id: Id86b697e2a1e11744ccc50a3c9ef04faf079ed94
(cherry picked from commit a28b67c7ec595e55a4ff083b8b270dfd5f74a889)

1 files changed, 11 insertions, 0 deletions

diff --git a/rild/rild.c b/rild/rild.c
index 65be7e0..34ed42d 100644
--- a/rild/rild.c
+++ b/rild/rild.c
@@ -96,6 +96,8 @@ static int make_argv(char * args, char ** argv)
  * Our group, cache, was set by init.
  */
 void switchUser() {
+    char debuggable[PROP_VALUE_MAX];
+
     prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
     setuid(AID_RADIO);
 
@@ -117,6 +119,15 @@ void switchUser() {
         RLOGE("capset failed: %s", strerror(errno));
         exit(EXIT_FAILURE);
     }
+
+    /*
+     * Debuggable build only:
+     * Set DUMPABLE that was cleared by setuid() to have tombstone on RIL crash
+     */
+    property_get("ro.debuggable", debuggable, "0");
+    if (strcmp(debuggable, "1") == 0) {
+        prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
+    }
 }
 
 int main(int argc, char **argv)