Merge "Remove execute-only memory related code." (615ef332) · Commits · e / os / android_frameworks_base

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

+1 −18

Original line number	Diff line number	Diff line
		@@ -24,7 +24,6 @@ import android.content.pm.ApplicationInfo;
		import android.net.Credentials;
		import android.net.LocalServerSocket;
		import android.net.LocalSocket;
		import android.os.Build;
		import android.os.FactoryTest;
		import android.os.IVold;
		import android.os.Process;
		@@ -254,16 +253,13 @@ public final class Zygote {
		*/
		public static int forkAndSpecialize(int uid, int gid, int[] gids, int runtimeFlags,
		int[][] rlimits, int mountExternal, String seInfo, String niceName, int[] fdsToClose,
		int[] fdsToIgnore, boolean startChildZygote, String instructionSet, String appDataDir,
		int targetSdkVersion) {
		int[] fdsToIgnore, boolean startChildZygote, String instructionSet, String appDataDir) {
		ZygoteHooks.preFork();

		int pid = nativeForkAndSpecialize(
		uid, gid, gids, runtimeFlags, rlimits, mountExternal, seInfo, niceName, fdsToClose,
		fdsToIgnore, startChildZygote, instructionSet, appDataDir);
		if (pid == 0) {
		Zygote.disableExecuteOnly(targetSdkVersion);

		// Note that this event ends at the end of handleChildProc,
		Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "PostFork");
		}
		@@ -649,8 +645,6 @@ public final class Zygote {
		args.mSeInfo, args.mNiceName, args.mStartChildZygote,
		args.mInstructionSet, args.mAppDataDir);

		disableExecuteOnly(args.mTargetSdkVersion);

		Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);

		return ZygoteInit.zygoteInit(args.mTargetSdkVersion,
		@@ -729,17 +723,6 @@ public final class Zygote {
		}
		}

		/**
		* Mark execute-only segments of libraries read+execute for apps with targetSdkVersion<Q.
		*/
		protected static void disableExecuteOnly(int targetSdkVersion) {
		if ((targetSdkVersion < Build.VERSION_CODES.Q) && !nativeDisableExecuteOnly()) {
		Log.e("Zygote", "Failed to set libraries to read+execute.");
		}
		}

		private static native boolean nativeDisableExecuteOnly();

		/**
		* @return Raw file descriptors for the read-end of USAP reporting pipes.
		*/

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

+1 −1

Original line number	Diff line number	Diff line
		@@ -257,7 +257,7 @@ class ZygoteConnection {
		pid = Zygote.forkAndSpecialize(parsedArgs.mUid, parsedArgs.mGid, parsedArgs.mGids,
		parsedArgs.mRuntimeFlags, rlimits, parsedArgs.mMountExternal, parsedArgs.mSeInfo,
		parsedArgs.mNiceName, fdsToClose, fdsToIgnore, parsedArgs.mStartChildZygote,
		parsedArgs.mInstructionSet, parsedArgs.mAppDataDir, parsedArgs.mTargetSdkVersion);
		parsedArgs.mInstructionSet, parsedArgs.mAppDataDir);

		try {
		if (pid == 0) {

core/jni/com_android_internal_os_Zygote.cpp

+0 −31

Original line number	Diff line number	Diff line
		@@ -46,7 +46,6 @@
		#include <fcntl.h>
		#include <grp.h>
		#include <inttypes.h>
		#include <link.h>
		#include <malloc.h>
		#include <mntent.h>
		#include <paths.h>
		@@ -55,7 +54,6 @@
		#include <sys/capability.h>
		#include <sys/cdefs.h>
		#include <sys/eventfd.h>
		#include <sys/mman.h>
		#include <sys/personality.h>
		#include <sys/prctl.h>
		#include <sys/resource.h>
		@@ -72,10 +70,8 @@
		#include <android-base/properties.h>
		#include <android-base/file.h>
		#include <android-base/stringprintf.h>
		#include <android-base/strings.h>
		#include <android-base/unique_fd.h>
		#include <bionic/malloc.h>
		#include <bionic/page.h>
		#include <cutils/fs.h>
		#include <cutils/multiuser.h>
		#include <private/android_filesystem_config.h>
		@@ -1783,31 +1779,6 @@ static void com_android_internal_os_Zygote_nativeEmptyUsapPool(JNIEnv* env, jcla
		}
		}

		static int disable_execute_only(struct dl_phdr_info info, size_t size, void data) {
		// Search for any execute-only segments and mark them read+execute.
		for (int i = 0; i < info->dlpi_phnum; i++) {
		const auto& phdr = info->dlpi_phdr[i];
		if ((phdr.p_type == PT_LOAD) && (phdr.p_flags == PF_X)) {
		auto addr = reinterpret_cast<void*>(info->dlpi_addr + PAGE_START(phdr.p_vaddr));
		size_t len = PAGE_OFFSET(phdr.p_vaddr) + phdr.p_memsz;
		if (mprotect(addr, len, PROT_READ \| PROT_EXEC) == -1) {
		ALOGE("mprotect(%p, %zu, PROT_READ \| PROT_EXEC) failed: %m", addr, len);
		return -1;
		}
		}
		}
		// Return non-zero to exit dl_iterate_phdr.
		return 0;
		}

		/**
		* @param env Managed runtime environment
		* @return True if disable was successful.
		*/
		static jboolean com_android_internal_os_Zygote_nativeDisableExecuteOnly(JNIEnv* env, jclass) {
		return dl_iterate_phdr(disable_execute_only, nullptr) == 0;
		}

		static void com_android_internal_os_Zygote_nativeBlockSigTerm(JNIEnv* env, jclass) {
		auto fail_fn = std::bind(ZygoteFailure, env, "usap", nullptr, _1);
		BlockSignal(SIGTERM, fail_fn);
		@@ -1889,8 +1860,6 @@ static const JNINativeMethod gMethods[] = {
		(void *) com_android_internal_os_Zygote_nativeGetUsapPoolCount },
		{ "nativeEmptyUsapPool", "()V",
		(void *) com_android_internal_os_Zygote_nativeEmptyUsapPool },
		{ "nativeDisableExecuteOnly", "()Z",
		(void *) com_android_internal_os_Zygote_nativeDisableExecuteOnly },
		{ "nativeBlockSigTerm", "()V",
		(void* ) com_android_internal_os_Zygote_nativeBlockSigTerm },
		{ "nativeUnblockSigTerm", "()V",