chromium/loader/loader.cpp - platform/frameworks/webview - Git at Google

 /*
  * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 // Uncomment for verbose logging.
 // #define LOG_NDEBUG 0
 #define LOG_TAG "webviewchromiumloader"

 #include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/types.h>

 #include <jni.h>
 #include <android/dlext.h>
 #include <nativeloader/native_loader.h>
 #include <utils/Log.h>

 #define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))

 namespace android {
 namespace {

 void* gReservedAddress = NULL;
 size_t gReservedSize = 0;

 jint LIBLOAD_SUCCESS;
 jint LIBLOAD_FAILED_TO_OPEN_RELRO_FILE;
 jint LIBLOAD_FAILED_TO_LOAD_LIBRARY;
 jint LIBLOAD_FAILED_JNI_CALL;
 jint LIBLOAD_FAILED_TO_FIND_NAMESPACE;

 jboolean DoReserveAddressSpace(jlong size) {
   size_t vsize = static_cast<size_t>(size);

   void* addr = mmap(NULL, vsize, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
   if (addr == MAP_FAILED) {
     ALOGE("Failed to reserve %zd bytes of address space for future load of "
           "libwebviewchromium.so: %s",
           vsize, strerror(errno));
     return JNI_FALSE;
   }
   gReservedAddress = addr;
   gReservedSize = vsize;
   ALOGV("Reserved %zd bytes at %p", vsize, addr);
   return JNI_TRUE;
 }

 jboolean DoCreateRelroFile(const char* lib, const char* relro) {
   // Try to unlink the old file, since if this is being called, the old one is
   // obsolete.
   if (unlink(relro) != 0 && errno != ENOENT) {
     // If something went wrong other than the file not existing, log a warning
     // but continue anyway in the hope that we can successfully overwrite the
     // existing file with rename() later.
     ALOGW("Failed to unlink old file %s: %s", relro, strerror(errno));
   }
   static const char tmpsuffix[] = ".XXXXXX";
   char relro_tmp[strlen(relro) + sizeof(tmpsuffix)];
   strlcpy(relro_tmp, relro, sizeof(relro_tmp));
   strlcat(relro_tmp, tmpsuffix, sizeof(relro_tmp));
   int tmp_fd = TEMP_FAILURE_RETRY(mkstemp(relro_tmp));
   if (tmp_fd == -1) {
     ALOGE("Failed to create temporary file %s: %s", relro_tmp, strerror(errno));
     return JNI_FALSE;
   }
   android_dlextinfo extinfo;
   extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS | ANDROID_DLEXT_WRITE_RELRO;
   extinfo.reserved_addr = gReservedAddress;
   extinfo.reserved_size = gReservedSize;
   extinfo.relro_fd = tmp_fd;
   void* handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo);
   int close_result = close(tmp_fd);
   if (handle == NULL) {
     ALOGE("Failed to load library %s: %s", lib, dlerror());
     unlink(relro_tmp);
     return JNI_FALSE;
   }
   if (close_result != 0 ||
       chmod(relro_tmp, S_IRUSR | S_IRGRP | S_IROTH) != 0 ||
       rename(relro_tmp, relro) != 0) {
     ALOGE("Failed to update relro file %s: %s", relro, strerror(errno));
     unlink(relro_tmp);
     return JNI_FALSE;
   }
   ALOGV("Created relro file %s for library %s", relro, lib);
   return JNI_TRUE;
 }

 jint DoLoadWithRelroFile(JNIEnv* env, const char* lib, const char* relro,
                          jobject clazzLoader) {
   int relro_fd = TEMP_FAILURE_RETRY(open(relro, O_RDONLY));
   if (relro_fd == -1) {
     ALOGE("Failed to open relro file %s: %s", relro, strerror(errno));
     return LIBLOAD_FAILED_TO_OPEN_RELRO_FILE;
   }
   android_namespace_t* ns =
       android::FindNamespaceByClassLoader(env, clazzLoader);
   if (ns == NULL) {
     ALOGE("Failed to find classloader namespace");
     return LIBLOAD_FAILED_TO_FIND_NAMESPACE;
   }
   android_dlextinfo extinfo;
   extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS | ANDROID_DLEXT_USE_RELRO |
                   ANDROID_DLEXT_USE_NAMESPACE;
   extinfo.reserved_addr = gReservedAddress;
   extinfo.reserved_size = gReservedSize;
   extinfo.relro_fd = relro_fd;
   extinfo.library_namespace = ns;
   void* handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo);
   close(relro_fd);
   if (handle == NULL) {
     ALOGE("Failed to load library %s: %s", lib, dlerror());
     return LIBLOAD_FAILED_TO_LOAD_LIBRARY;
   }
   ALOGV("Loaded library %s with relro file %s", lib, relro);
   return LIBLOAD_SUCCESS;
 }

 /******************************************************************************/
 /* JNI wrappers - handle string lifetimes and 32/64 ABI choice                */
 /******************************************************************************/

 jboolean ReserveAddressSpace(JNIEnv*, jclass, jlong size) {
   return DoReserveAddressSpace(size);
 }

 jboolean CreateRelroFile(JNIEnv* env, jclass, jstring lib32, jstring lib64,
                          jstring relro32, jstring relro64) {
 #ifdef __LP64__
   jstring lib = lib64;
   jstring relro = relro64;
   (void)lib32; (void)relro32;
 #else
   jstring lib = lib32;
   jstring relro = relro32;
   (void)lib64; (void)relro64;
 #endif
   jboolean ret = JNI_FALSE;
   const char* lib_utf8 = env->GetStringUTFChars(lib, NULL);
   if (lib_utf8 != NULL) {
     const char* relro_utf8 = env->GetStringUTFChars(relro, NULL);
     if (relro_utf8 != NULL) {
       ret = DoCreateRelroFile(lib_utf8, relro_utf8);
       env->ReleaseStringUTFChars(relro, relro_utf8);
     }
     env->ReleaseStringUTFChars(lib, lib_utf8);
   }
   return ret;
 }

 jint LoadWithRelroFile(JNIEnv* env, jclass, jstring lib32, jstring lib64,
                        jstring relro32, jstring relro64, jobject clazzLoader) {
 #ifdef __LP64__
   jstring lib = lib64;
   jstring relro = relro64;
   (void)lib32; (void)relro32;
 #else
   jstring lib = lib32;
   jstring relro = relro32;
   (void)lib64; (void)relro64;
 #endif
   jint ret = LIBLOAD_FAILED_JNI_CALL;
   const char* lib_utf8 = env->GetStringUTFChars(lib, NULL);
   if (lib_utf8 != NULL) {
     const char* relro_utf8 = env->GetStringUTFChars(relro, NULL);
     if (relro_utf8 != NULL) {
       ret = DoLoadWithRelroFile(env, lib_utf8, relro_utf8, clazzLoader);
       env->ReleaseStringUTFChars(relro, relro_utf8);
     }
     env->ReleaseStringUTFChars(lib, lib_utf8);
   }
   return ret;
 }

 const char kClassName[] = "android/webkit/WebViewFactory";
 const JNINativeMethod kJniMethods[] = {
   { "nativeReserveAddressSpace", "(J)Z",
       reinterpret_cast<void*>(ReserveAddressSpace) },
   { "nativeCreateRelroFile",
       "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Z",
       reinterpret_cast<void*>(CreateRelroFile) },
   { "nativeLoadWithRelroFile",
       "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/ClassLoader;)I",
       reinterpret_cast<void*>(LoadWithRelroFile) },
 };

 }  // namespace

 void RegisterWebViewFactory(JNIEnv* env) {
   // If either of these fail, it will set an exception that will be thrown on
   // return, so no need to handle errors here.
   jclass clazz = env->FindClass(kClassName);
   if (clazz) {
     env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));

     LIBLOAD_SUCCESS = env->GetStaticIntField(
         clazz,
         env->GetStaticFieldID(clazz, "LIBLOAD_SUCCESS", "I"));

     LIBLOAD_FAILED_TO_OPEN_RELRO_FILE = env->GetStaticIntField(
         clazz,
         env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_TO_OPEN_RELRO_FILE", "I"));

     LIBLOAD_FAILED_TO_LOAD_LIBRARY = env->GetStaticIntField(
         clazz,
         env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_TO_LOAD_LIBRARY", "I"));

     LIBLOAD_FAILED_JNI_CALL = env->GetStaticIntField(
         clazz,
         env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_JNI_CALL", "I"));

     LIBLOAD_FAILED_TO_FIND_NAMESPACE = env->GetStaticIntField(
         clazz,
         env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_TO_FIND_NAMESPACE", "I"));
   }
 }

 }  // namespace android

 JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*) {
   JNIEnv* env = NULL;
   if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
     ALOGE("GetEnv failed");
     return JNI_ERR;
   }
   android::RegisterWebViewFactory(env);
   return JNI_VERSION_1_6;
 }
	/*
	* Copyright (C) 2014 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	// Uncomment for verbose logging.
	// #define LOG_NDEBUG 0
	#define LOG_TAG "webviewchromiumloader"

	#include <dlfcn.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/mman.h>
	#include <sys/stat.h>
	#include <sys/types.h>

	#include <jni.h>
	#include <android/dlext.h>
	#include <nativeloader/native_loader.h>
	#include <utils/Log.h>

	#define NELEM(x) ((int) (sizeof(x) / sizeof((x)[0])))

	namespace android {
	namespace {

	void* gReservedAddress = NULL;
	size_t gReservedSize = 0;

	jint LIBLOAD_SUCCESS;
	jint LIBLOAD_FAILED_TO_OPEN_RELRO_FILE;
	jint LIBLOAD_FAILED_TO_LOAD_LIBRARY;
	jint LIBLOAD_FAILED_JNI_CALL;
	jint LIBLOAD_FAILED_TO_FIND_NAMESPACE;

	jboolean DoReserveAddressSpace(jlong size) {
	size_t vsize = static_cast<size_t>(size);

	void* addr = mmap(NULL, vsize, PROT_NONE, MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
	if (addr == MAP_FAILED) {
	ALOGE("Failed to reserve %zd bytes of address space for future load of "
	"libwebviewchromium.so: %s",
	vsize, strerror(errno));
	return JNI_FALSE;
	}
	gReservedAddress = addr;
	gReservedSize = vsize;
	ALOGV("Reserved %zd bytes at %p", vsize, addr);
	return JNI_TRUE;
	}

	jboolean DoCreateRelroFile(const char* lib, const char* relro) {
	// Try to unlink the old file, since if this is being called, the old one is
	// obsolete.
	if (unlink(relro) != 0 && errno != ENOENT) {
	// If something went wrong other than the file not existing, log a warning
	// but continue anyway in the hope that we can successfully overwrite the
	// existing file with rename() later.
	ALOGW("Failed to unlink old file %s: %s", relro, strerror(errno));
	}
	static const char tmpsuffix[] = ".XXXXXX";
	char relro_tmp[strlen(relro) + sizeof(tmpsuffix)];
	strlcpy(relro_tmp, relro, sizeof(relro_tmp));
	strlcat(relro_tmp, tmpsuffix, sizeof(relro_tmp));
	int tmp_fd = TEMP_FAILURE_RETRY(mkstemp(relro_tmp));
	if (tmp_fd == -1) {
	ALOGE("Failed to create temporary file %s: %s", relro_tmp, strerror(errno));
	return JNI_FALSE;
	}
	android_dlextinfo extinfo;
	extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS \| ANDROID_DLEXT_WRITE_RELRO;
	extinfo.reserved_addr = gReservedAddress;
	extinfo.reserved_size = gReservedSize;
	extinfo.relro_fd = tmp_fd;
	void* handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo);
	int close_result = close(tmp_fd);
	if (handle == NULL) {
	ALOGE("Failed to load library %s: %s", lib, dlerror());
	unlink(relro_tmp);
	return JNI_FALSE;
	}
	if (close_result != 0 \|\|
	chmod(relro_tmp, S_IRUSR \| S_IRGRP \| S_IROTH) != 0 \|\|
	rename(relro_tmp, relro) != 0) {
	ALOGE("Failed to update relro file %s: %s", relro, strerror(errno));
	unlink(relro_tmp);
	return JNI_FALSE;
	}
	ALOGV("Created relro file %s for library %s", relro, lib);
	return JNI_TRUE;
	}

	jint DoLoadWithRelroFile(JNIEnv* env, const char* lib, const char* relro,
	jobject clazzLoader) {
	int relro_fd = TEMP_FAILURE_RETRY(open(relro, O_RDONLY));
	if (relro_fd == -1) {
	ALOGE("Failed to open relro file %s: %s", relro, strerror(errno));
	return LIBLOAD_FAILED_TO_OPEN_RELRO_FILE;
	}
	android_namespace_t* ns =
	android::FindNamespaceByClassLoader(env, clazzLoader);
	if (ns == NULL) {
	ALOGE("Failed to find classloader namespace");
	return LIBLOAD_FAILED_TO_FIND_NAMESPACE;
	}
	android_dlextinfo extinfo;
	extinfo.flags = ANDROID_DLEXT_RESERVED_ADDRESS \| ANDROID_DLEXT_USE_RELRO \|
	ANDROID_DLEXT_USE_NAMESPACE;
	extinfo.reserved_addr = gReservedAddress;
	extinfo.reserved_size = gReservedSize;
	extinfo.relro_fd = relro_fd;
	extinfo.library_namespace = ns;
	void* handle = android_dlopen_ext(lib, RTLD_NOW, &extinfo);
	close(relro_fd);
	if (handle == NULL) {
	ALOGE("Failed to load library %s: %s", lib, dlerror());
	return LIBLOAD_FAILED_TO_LOAD_LIBRARY;
	}
	ALOGV("Loaded library %s with relro file %s", lib, relro);
	return LIBLOAD_SUCCESS;
	}

	/******************************************************************************/
	/* JNI wrappers - handle string lifetimes and 32/64 ABI choice */
	/******************************************************************************/

	jboolean ReserveAddressSpace(JNIEnv*, jclass, jlong size) {
	return DoReserveAddressSpace(size);
	}

	jboolean CreateRelroFile(JNIEnv* env, jclass, jstring lib32, jstring lib64,
	jstring relro32, jstring relro64) {
	#ifdef __LP64__
	jstring lib = lib64;
	jstring relro = relro64;
	(void)lib32; (void)relro32;
	#else
	jstring lib = lib32;
	jstring relro = relro32;
	(void)lib64; (void)relro64;
	#endif
	jboolean ret = JNI_FALSE;
	const char* lib_utf8 = env->GetStringUTFChars(lib, NULL);
	if (lib_utf8 != NULL) {
	const char* relro_utf8 = env->GetStringUTFChars(relro, NULL);
	if (relro_utf8 != NULL) {
	ret = DoCreateRelroFile(lib_utf8, relro_utf8);
	env->ReleaseStringUTFChars(relro, relro_utf8);
	}
	env->ReleaseStringUTFChars(lib, lib_utf8);
	}
	return ret;
	}

	jint LoadWithRelroFile(JNIEnv* env, jclass, jstring lib32, jstring lib64,
	jstring relro32, jstring relro64, jobject clazzLoader) {
	#ifdef __LP64__
	jstring lib = lib64;
	jstring relro = relro64;
	(void)lib32; (void)relro32;
	#else
	jstring lib = lib32;
	jstring relro = relro32;
	(void)lib64; (void)relro64;
	#endif
	jint ret = LIBLOAD_FAILED_JNI_CALL;
	const char* lib_utf8 = env->GetStringUTFChars(lib, NULL);
	if (lib_utf8 != NULL) {
	const char* relro_utf8 = env->GetStringUTFChars(relro, NULL);
	if (relro_utf8 != NULL) {
	ret = DoLoadWithRelroFile(env, lib_utf8, relro_utf8, clazzLoader);
	env->ReleaseStringUTFChars(relro, relro_utf8);
	}
	env->ReleaseStringUTFChars(lib, lib_utf8);
	}
	return ret;
	}

	const char kClassName[] = "android/webkit/WebViewFactory";
	const JNINativeMethod kJniMethods[] = {
	{ "nativeReserveAddressSpace", "(J)Z",
	reinterpret_cast<void*>(ReserveAddressSpace) },
	{ "nativeCreateRelroFile",
	"(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Z",
	reinterpret_cast<void*>(CreateRelroFile) },
	{ "nativeLoadWithRelroFile",
	"(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/ClassLoader;)I",
	reinterpret_cast<void*>(LoadWithRelroFile) },
	};

	} // namespace

	void RegisterWebViewFactory(JNIEnv* env) {
	// If either of these fail, it will set an exception that will be thrown on
	// return, so no need to handle errors here.
	jclass clazz = env->FindClass(kClassName);
	if (clazz) {
	env->RegisterNatives(clazz, kJniMethods, NELEM(kJniMethods));

	LIBLOAD_SUCCESS = env->GetStaticIntField(
	clazz,
	env->GetStaticFieldID(clazz, "LIBLOAD_SUCCESS", "I"));

	LIBLOAD_FAILED_TO_OPEN_RELRO_FILE = env->GetStaticIntField(
	clazz,
	env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_TO_OPEN_RELRO_FILE", "I"));

	LIBLOAD_FAILED_TO_LOAD_LIBRARY = env->GetStaticIntField(
	clazz,
	env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_TO_LOAD_LIBRARY", "I"));

	LIBLOAD_FAILED_JNI_CALL = env->GetStaticIntField(
	clazz,
	env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_JNI_CALL", "I"));

	LIBLOAD_FAILED_TO_FIND_NAMESPACE = env->GetStaticIntField(
	clazz,
	env->GetStaticFieldID(clazz, "LIBLOAD_FAILED_TO_FIND_NAMESPACE", "I"));
	}
	}

	} // namespace android

	JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void*) {
	JNIEnv* env = NULL;
	if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
	ALOGE("GetEnv failed");
	return JNI_ERR;
	}
	android::RegisterWebViewFactory(env);
	return JNI_VERSION_1_6;
	}