am a3c3533b: Merge "Finish fixing Zygote descriptor leakage problem" (53c7608a) · Commits · e / os / android_frameworks_base

core/java/com/android/internal/os/ZygoteConnection.java

+35 −1

Original line number	Diff line number	Diff line
		@@ -224,9 +224,37 @@ class ZygoteConnection {
		ZygoteInit.setCloseOnExec(serverPipeFd, true);
		}

		/**
		* In order to avoid leaking descriptors to the Zygote child,
		* the native code must close the two Zygote socket descriptors
		* in the child process before it switches from Zygote-root to
		* the UID and privileges of the application being launched.
		*
		* In order to avoid "bad file descriptor" errors when the
		* two LocalSocket objects are closed, the Posix file
		* descriptors are released via a dup2() call which closes
		* the socket and substitutes an open descriptor to /dev/null.
		*/

		int [] fdsToClose = { -1, -1 };

		FileDescriptor fd = mSocket.getFileDescriptor();

		if (fd != null) {
		fdsToClose[0] = fd.getInt$();
		}

		fd = ZygoteInit.getServerSocketFileDescriptor();

		if (fd != null) {
		fdsToClose[1] = fd.getInt$();
		}

		fd = null;

		pid = Zygote.forkAndSpecialize(parsedArgs.uid, parsedArgs.gid, parsedArgs.gids,
		parsedArgs.debugFlags, rlimits, parsedArgs.mountExternal, parsedArgs.seInfo,
		parsedArgs.niceName);
		parsedArgs.niceName, fdsToClose);
		} catch (IOException ex) {
		logAndPrintError(newStderr, "Exception creating pipe", ex);
		} catch (ErrnoException ex) {
		@@ -814,6 +842,12 @@ class ZygoteConnection {
		FileDescriptor[] descriptors, FileDescriptor pipeFd, PrintStream newStderr)
		throws ZygoteInit.MethodAndArgsCaller {

		/**
		* By the time we get here, the native code has closed the two actual Zygote
		* socket connections, and substituted /dev/null in their place. The LocalSocket
		* objects still need to be closed properly.
		*/

		closeSocket();
		ZygoteInit.closeServerSocket();

core/java/com/android/internal/os/ZygoteInit.java

+10 −0

Original line number	Diff line number	Diff line
		@@ -201,6 +201,16 @@ public class ZygoteInit {
		sServerSocket = null;
		}

		/**
		* Return the server socket's underlying file descriptor, so that
		* ZygoteConnection can pass it to the native code for proper
		* closure after a child process is forked off.
		*/

		static FileDescriptor getServerSocketFileDescriptor() {
		return sServerSocket.getFileDescriptor();
		}

		private static final int UNPRIVILEGED_UID = 9999;
		private static final int UNPRIVILEGED_GID = 9999;