Merge "Have `otapreopt_chroot` bind-mount Bionic artifacts from the Runtime APEX." (d7a7b072) · Commits · e / os / android_frameworks_native

cmds/installd/otapreopt_chroot.cpp

+71 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,23 @@ using android::base::StringPrintf;
		namespace android {
		namespace installd {

		// Configuration for bind-mounted Bionic artifacts.

		static constexpr const char* kLinkerMountPoint = "/bionic/bin/linker";
		static constexpr const char* kRuntimeLinkerPath = "/apex/com.android.runtime/bin/linker";

		static constexpr const char* kBionicLibsMountPointDir = "/bionic/lib/";
		static constexpr const char* kRuntimeBionicLibsDir = "/apex/com.android.runtime/lib/bionic/";

		static constexpr const char* kLinkerMountPoint64 = "/bionic/bin/linker64";
		static constexpr const char* kRuntimeLinkerPath64 = "/apex/com.android.runtime/bin/linker64";

		static constexpr const char* kBionicLibsMountPointDir64 = "/bionic/lib64/";
		static constexpr const char* kRuntimeBionicLibsDir64 = "/apex/com.android.runtime/lib64/bionic/";

		static const std::vector<std::string> kBionicLibFileNames = {"libc.so", "libm.so", "libdl.so"};


		static void CloseDescriptor(int fd) {
		if (fd >= 0) {
		int result = close(fd);
		@@ -79,6 +96,43 @@ static void DeactivateApexPackages(const std::vector<apex::ApexFile>& active_pac
		}
		}

		// Copied from system/core/init/mount_namespace.cpp.
		static bool BindMount(const std::string& source, const std::string& mount_point,
		bool recursive = false) {
		unsigned long mountflags = MS_BIND;
		if (recursive) {
		mountflags \|= MS_REC;
		}
		if (mount(source.c_str(), mount_point.c_str(), nullptr, mountflags, nullptr) == -1) {
		PLOG(ERROR) << "Could not bind-mount " << source << " to " << mount_point;
		return false;
		}
		return true;
		}

		// Copied from system/core/init/mount_namespace.cpp and and adjusted (bind
		// mounts are not made private, as the /postinstall is already private (see
		// `android::installd::otapreopt_chroot`).
		static bool BindMountBionic(const std::string& linker_source, const std::string& lib_dir_source,
		const std::string& linker_mount_point,
		const std::string& lib_mount_dir) {
		if (access(linker_source.c_str(), F_OK) != 0) {
		PLOG(INFO) << linker_source << " does not exist. Skipping mounting Bionic there.";
		return true;
		}
		if (!BindMount(linker_source, linker_mount_point)) {
		return false;
		}
		for (const auto& libname : kBionicLibFileNames) {
		std::string mount_point = lib_mount_dir + libname;
		std::string source = lib_dir_source + libname;
		if (!BindMount(source, mount_point)) {
		return false;
		}
		}
		return true;
		}

		// Entry for otapreopt_chroot. Expected parameters are:
		// [cmd] [status-fd] [target-slot] "dexopt" [dexopt-params]
		// The file descriptor denoted by status-fd will be closed. The rest of the parameters will
		@@ -222,6 +276,23 @@ static int otapreopt_chroot(const int argc, char **arg) {
		// the Android Runtime APEX, as it is required by otapreopt to run dex2oat.
		std::vector<apex::ApexFile> active_packages = ActivateApexPackages();

		// Bind-mount Bionic artifacts from the Runtime APEX.
		// This logic is copied and adapted from system/core/init/mount_namespace.cpp.
		if (!BindMountBionic(kRuntimeLinkerPath, kRuntimeBionicLibsDir, kLinkerMountPoint,
		kBionicLibsMountPointDir)) {
		LOG(ERROR) << "Failed to mount 32-bit Bionic artifacts from the Runtime APEX.";
		// Clean up and exit.
		DeactivateApexPackages(active_packages);
		exit(215);
		}
		if (!BindMountBionic(kRuntimeLinkerPath64, kRuntimeBionicLibsDir64, kLinkerMountPoint64,
		kBionicLibsMountPointDir64)) {
		LOG(ERROR) << "Failed to mount 64-bit Bionic artifacts from the Runtime APEX.";
		// Clean up and exit.
		DeactivateApexPackages(active_packages);
		exit(216);
		}

		// Now go on and run otapreopt.

		// Incoming: cmd + status-fd + target-slot + cmd... \| Incoming \| = argc