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Unified Diff: android/linker/legacy_linker_jni.cc

Issue 2043183002: Update to Chromium //base at Chromium commit 01cb97b2e09618bbc3a60c7348f0a844eea20547. (Closed) Base URL: https://github.com/domokit/base.git@master
Patch Set: Created 4 years, 6 months ago
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Index: android/linker/legacy_linker_jni.cc
diff --git a/android/linker/legacy_linker_jni.cc b/android/linker/legacy_linker_jni.cc
index bc677c4150bf4fb6c17b25db92bc12a9aa7635cf..e4c0455c67cc22707187ce323cf0f8a9287a3b42 100644
--- a/android/linker/legacy_linker_jni.cc
+++ b/android/linker/legacy_linker_jni.cc
@@ -2,254 +2,26 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-// This is the Android-specific Chromium linker, a tiny shared library
-// implementing a custom dynamic linker that can be used to load the
-// real Chromium libraries (e.g. libcontentshell.so).
-
-// The main point of this linker is to be able to share the RELRO
-// section of libcontentshell.so (or equivalent) between the browser and
-// renderer process.
+// This is the version of the Android-specific Chromium linker that uses
+// the crazy linker to load libraries.
// This source code *cannot* depend on anything from base/ or the C++
// STL, to keep the final library small, and avoid ugly dependency issues.
-#include <android/log.h>
+#include "legacy_linker_jni.h"
+
#include <crazy_linker.h>
#include <fcntl.h>
#include <jni.h>
#include <limits.h>
#include <stdlib.h>
-#include <sys/mman.h>
#include <unistd.h>
-// See commentary in crazy_linker_elf_loader.cpp for the effect of setting
-// this. If changing there, change here also.
-//
-// For more, see:
-// https://crbug.com/504410
-#define RESERVE_BREAKPAD_GUARD_REGION 1
-
-// Set this to 1 to enable debug traces to the Android log.
-// Note that LOG() from "base/logging.h" cannot be used, since it is
-// in base/ which hasn't been loaded yet.
-#define DEBUG 0
-
-#define TAG "chromium_android_linker"
-
-#if DEBUG
-#define LOG_INFO(...) __android_log_print(ANDROID_LOG_INFO, TAG, __VA_ARGS__)
-#else
-#define LOG_INFO(...) ((void)0)
-#endif
-#define LOG_ERROR(...) __android_log_print(ANDROID_LOG_ERROR, TAG, __VA_ARGS__)
-
-#define UNUSED __attribute__((unused))
+#include "linker_jni.h"
+namespace chromium_android_linker {
namespace {
-// A simply scoped UTF String class that can be initialized from
-// a Java jstring handle. Modeled like std::string, which cannot
-// be used here.
-class String {
- public:
- String(JNIEnv* env, jstring str);
-
- ~String() {
- if (ptr_)
- ::free(ptr_);
- }
-
- const char* c_str() const { return ptr_ ? ptr_ : ""; }
- size_t size() const { return size_; }
-
- private:
- char* ptr_;
- size_t size_;
-};
-
-String::String(JNIEnv* env, jstring str) {
- size_ = env->GetStringUTFLength(str);
- ptr_ = static_cast<char*>(::malloc(size_ + 1));
-
- // Note: This runs before browser native code is loaded, and so cannot
- // rely on anything from base/. This means that we must use
- // GetStringUTFChars() and not base::android::ConvertJavaStringToUTF8().
- //
- // GetStringUTFChars() suffices because the only strings used here are
- // paths to APK files or names of shared libraries, all of which are
- // plain ASCII, defined and hard-coded by the Chromium Android build.
- //
- // For more: see
- // https://crbug.com/508876
- //
- // Note: GetStringUTFChars() returns Java UTF-8 bytes. This is good
- // enough for the linker though.
- const char* bytes = env->GetStringUTFChars(str, NULL);
- ::memcpy(ptr_, bytes, size_);
- ptr_[size_] = '\0';
-
- env->ReleaseStringUTFChars(str, bytes);
-}
-
-// Return true iff |address| is a valid address for the target CPU.
-bool IsValidAddress(jlong address) {
- return static_cast<jlong>(static_cast<size_t>(address)) == address;
-}
-
-// Find the jclass JNI reference corresponding to a given |class_name|.
-// |env| is the current JNI environment handle.
-// On success, return true and set |*clazz|.
-bool InitClassReference(JNIEnv* env, const char* class_name, jclass* clazz) {
- *clazz = env->FindClass(class_name);
- if (!*clazz) {
- LOG_ERROR("Could not find class for %s", class_name);
- return false;
- }
- return true;
-}
-
-// Initialize a jfieldID corresponding to the field of a given |clazz|,
-// with name |field_name| and signature |field_sig|.
-// |env| is the current JNI environment handle.
-// On success, return true and set |*field_id|.
-bool InitFieldId(JNIEnv* env,
- jclass clazz,
- const char* field_name,
- const char* field_sig,
- jfieldID* field_id) {
- *field_id = env->GetFieldID(clazz, field_name, field_sig);
- if (!*field_id) {
- LOG_ERROR("Could not find ID for field '%s'", field_name);
- return false;
- }
- LOG_INFO("%s: Found ID %p for field '%s'", __FUNCTION__, *field_id,
- field_name);
- return true;
-}
-
-// Initialize a jmethodID corresponding to the static method of a given
-// |clazz|, with name |method_name| and signature |method_sig|.
-// |env| is the current JNI environment handle.
-// On success, return true and set |*method_id|.
-bool InitStaticMethodId(JNIEnv* env,
- jclass clazz,
- const char* method_name,
- const char* method_sig,
- jmethodID* method_id) {
- *method_id = env->GetStaticMethodID(clazz, method_name, method_sig);
- if (!*method_id) {
- LOG_ERROR("Could not find ID for static method '%s'", method_name);
- return false;
- }
- LOG_INFO("%s: Found ID %p for static method '%s'", __FUNCTION__, *method_id,
- method_name);
- return true;
-}
-
-// Initialize a jfieldID corresponding to the static field of a given |clazz|,
-// with name |field_name| and signature |field_sig|.
-// |env| is the current JNI environment handle.
-// On success, return true and set |*field_id|.
-bool InitStaticFieldId(JNIEnv* env,
- jclass clazz,
- const char* field_name,
- const char* field_sig,
- jfieldID* field_id) {
- *field_id = env->GetStaticFieldID(clazz, field_name, field_sig);
- if (!*field_id) {
- LOG_ERROR("Could not find ID for static field '%s'", field_name);
- return false;
- }
- LOG_INFO("%s: Found ID %p for static field '%s'", __FUNCTION__, *field_id,
- field_name);
- return true;
-}
-
-// Initialize a jint corresponding to the static integer field of a class
-// with class name |class_name| and field name |field_name|.
-// |env| is the current JNI environment handle.
-// On success, return true and set |*value|.
-bool InitStaticInt(JNIEnv* env,
- const char* class_name,
- const char* field_name,
- jint* value) {
- jclass clazz;
- if (!InitClassReference(env, class_name, &clazz))
- return false;
-
- jfieldID field_id;
- if (!InitStaticFieldId(env, clazz, field_name, "I", &field_id))
- return false;
-
- *value = env->GetStaticIntField(clazz, field_id);
- LOG_INFO("%s: Found value %d for class '%s', static field '%s'", __FUNCTION__,
- *value, class_name, field_name);
-
- return true;
-}
-
-// A class used to model the field IDs of the org.chromium.base.Linker
-// LibInfo inner class, used to communicate data with the Java side
-// of the linker.
-struct LibInfo_class {
- jfieldID load_address_id;
- jfieldID load_size_id;
- jfieldID relro_start_id;
- jfieldID relro_size_id;
- jfieldID relro_fd_id;
-
- // Initialize an instance.
- bool Init(JNIEnv* env) {
- jclass clazz;
- if (!InitClassReference(
- env, "org/chromium/base/library_loader/Linker$LibInfo", &clazz)) {
- return false;
- }
-
- return InitFieldId(env, clazz, "mLoadAddress", "J", &load_address_id) &&
- InitFieldId(env, clazz, "mLoadSize", "J", &load_size_id) &&
- InitFieldId(env, clazz, "mRelroStart", "J", &relro_start_id) &&
- InitFieldId(env, clazz, "mRelroSize", "J", &relro_size_id) &&
- InitFieldId(env, clazz, "mRelroFd", "I", &relro_fd_id);
- }
-
- void SetLoadInfo(JNIEnv* env,
- jobject library_info_obj,
- size_t load_address,
- size_t load_size) {
- env->SetLongField(library_info_obj, load_address_id, load_address);
- env->SetLongField(library_info_obj, load_size_id, load_size);
- }
-
- // Use this instance to convert a RelroInfo reference into
- // a crazy_library_info_t.
- void GetRelroInfo(JNIEnv* env,
- jobject library_info_obj,
- size_t* relro_start,
- size_t* relro_size,
- int* relro_fd) {
- *relro_start = static_cast<size_t>(
- env->GetLongField(library_info_obj, relro_start_id));
-
- *relro_size =
- static_cast<size_t>(env->GetLongField(library_info_obj, relro_size_id));
-
- *relro_fd = env->GetIntField(library_info_obj, relro_fd_id);
- }
-
- void SetRelroInfo(JNIEnv* env,
- jobject library_info_obj,
- size_t relro_start,
- size_t relro_size,
- int relro_fd) {
- env->SetLongField(library_info_obj, relro_start_id, relro_start);
- env->SetLongField(library_info_obj, relro_size_id, relro_size);
- env->SetIntField(library_info_obj, relro_fd_id, relro_fd);
- }
-};
-
-static LibInfo_class s_lib_info_fields;
-
// Retrieve the SDK build version and pass it into the crazy linker. This
// needs to be done early in initialization, before any other crazy linker
// code is run.
@@ -261,8 +33,7 @@ bool InitSDKVersionInfo(JNIEnv* env) {
return false;
crazy_set_sdk_build_version(static_cast<int>(value));
- LOG_INFO("%s: Set SDK build version to %d", __FUNCTION__,
- static_cast<int>(value));
+ LOG_INFO("Set SDK build version to %d", static_cast<int>(value));
return true;
}
@@ -270,9 +41,9 @@ bool InitSDKVersionInfo(JNIEnv* env) {
// The linker uses a single crazy_context_t object created on demand.
// There is no need to protect this against concurrent access, locking
// is already handled on the Java side.
-static crazy_context_t* s_crazy_context;
-
crazy_context_t* GetCrazyContext() {
+ static crazy_context_t* s_crazy_context = nullptr;
+
if (!s_crazy_context) {
// Create new context.
s_crazy_context = crazy_context_create();
@@ -290,7 +61,7 @@ crazy_context_t* GetCrazyContext() {
// on scope exit, unless Release() has been called.
class ScopedLibrary {
public:
- ScopedLibrary() : lib_(NULL) {}
+ ScopedLibrary() : lib_(nullptr) {}
~ScopedLibrary() {
if (lib_)
@@ -303,7 +74,7 @@ class ScopedLibrary {
crazy_library_t* Release() {
crazy_library_t* ret = lib_;
- lib_ = NULL;
+ lib_ = nullptr;
return ret;
}
@@ -311,18 +82,17 @@ class ScopedLibrary {
crazy_library_t* lib_;
};
-namespace {
-
template <class LibraryOpener>
bool GenericLoadLibrary(JNIEnv* env,
const char* library_name,
jlong load_address,
jobject lib_info_obj,
const LibraryOpener& opener) {
+ LOG_INFO("Called for %s, at address 0x%llx", library_name, load_address);
crazy_context_t* context = GetCrazyContext();
if (!IsValidAddress(load_address)) {
- LOG_ERROR("%s: Invalid address 0x%llx", __FUNCTION__, load_address);
+ LOG_ERROR("Invalid address 0x%llx", load_address);
return false;
}
@@ -336,8 +106,8 @@ bool GenericLoadLibrary(JNIEnv* env,
crazy_library_info_t info;
if (!crazy_library_get_info(library.Get(), context, &info)) {
- LOG_ERROR("%s: Could not get library information for %s: %s", __FUNCTION__,
- library_name, crazy_context_get_error(context));
+ LOG_ERROR("Could not get library information for %s: %s", library_name,
+ crazy_context_get_error(context));
return false;
}
@@ -346,7 +116,7 @@ bool GenericLoadLibrary(JNIEnv* env,
s_lib_info_fields.SetLoadInfo(env, lib_info_obj, info.load_address,
info.load_size);
- LOG_INFO("%s: Success loading library %s", __FUNCTION__, library_name);
+ LOG_INFO("Success loading library %s", library_name);
return true;
}
@@ -362,7 +132,7 @@ bool FileLibraryOpener::Open(crazy_library_t** library,
const char* library_name,
crazy_context_t* context) const {
if (!crazy_library_open(library, library_name, context)) {
- LOG_ERROR("%s: Could not open %s: %s", __FUNCTION__, library_name,
+ LOG_ERROR("Could not open %s: %s", library_name,
crazy_context_get_error(context));
return false;
}
@@ -386,20 +156,19 @@ bool ZipLibraryOpener::Open(crazy_library_t** library,
crazy_context_t* context) const {
if (!crazy_library_open_in_zip_file(library, zip_file_, library_name,
context)) {
- LOG_ERROR("%s: Could not open %s in zip file %s: %s", __FUNCTION__,
- library_name, zip_file_, crazy_context_get_error(context));
+ LOG_ERROR("Could not open %s in zip file %s: %s", library_name, zip_file_,
+ crazy_context_get_error(context));
return false;
}
return true;
}
-} // unnamed namespace
-
// Load a library with the chromium linker. This will also call its
// JNI_OnLoad() method, which shall register its methods. Note that
// lazy native method resolution will _not_ work after this, because
// Dalvik uses the system's dlsym() which won't see the new library,
// so explicit registration is mandatory.
+//
// |env| is the current JNI environment handle.
// |clazz| is the static class handle for org.chromium.base.Linker,
// and is ignored here.
@@ -415,6 +184,7 @@ jboolean LoadLibrary(JNIEnv* env,
jobject lib_info_obj) {
String lib_name(env, library_name);
FileLibraryOpener opener;
+
return GenericLoadLibrary(env, lib_name.c_str(),
static_cast<size_t>(load_address), lib_info_obj,
opener);
@@ -451,6 +221,7 @@ jboolean LoadLibraryInZipFile(JNIEnv* env,
String zipfile_name_str(env, zipfile_name);
String lib_name(env, library_name);
ZipLibraryOpener opener(zipfile_name_str.c_str());
+
return GenericLoadLibrary(env, lib_name.c_str(),
static_cast<size_t>(load_address), lib_info_obj,
opener);
@@ -481,7 +252,7 @@ static JavaCallbackBindings_class s_java_callback_bindings;
void RunCallbackOnUiThread(JNIEnv* env, jclass clazz, jlong arg) {
crazy_callback_t* callback = reinterpret_cast<crazy_callback_t*>(arg);
- LOG_INFO("%s: Called back from java with handler %p, opaque %p", __FUNCTION__,
+ LOG_INFO("Called back from java with handler %p, opaque %p",
callback->handler, callback->opaque);
crazy_callback_run(callback);
@@ -517,8 +288,8 @@ static bool PostForLaterExecution(crazy_callback_t* callback_request,
crazy_callback_t* callback = new crazy_callback_t();
*callback = *callback_request;
- LOG_INFO("%s: Calling back to java with handler %p, opaque %p", __FUNCTION__,
- callback->handler, callback->opaque);
+ LOG_INFO("Calling back to java with handler %p, opaque %p", callback->handler,
+ callback->opaque);
jlong arg = static_cast<jlong>(reinterpret_cast<uintptr_t>(callback));
@@ -543,16 +314,16 @@ jboolean CreateSharedRelro(JNIEnv* env,
jobject lib_info_obj) {
String lib_name(env, library_name);
- LOG_INFO("%s: Called for %s", __FUNCTION__, lib_name.c_str());
+ LOG_INFO("Called for %s", lib_name.c_str());
if (!IsValidAddress(load_address)) {
- LOG_ERROR("%s: Invalid address 0x%llx", __FUNCTION__, load_address);
+ LOG_ERROR("Invalid address 0x%llx", load_address);
return false;
}
ScopedLibrary library;
if (!crazy_library_find_by_name(lib_name.c_str(), library.GetPtr())) {
- LOG_ERROR("%s: Could not find %s", __FUNCTION__, lib_name.c_str());
+ LOG_ERROR("Could not find %s", lib_name.c_str());
return false;
}
@@ -564,8 +335,8 @@ jboolean CreateSharedRelro(JNIEnv* env,
if (!crazy_library_create_shared_relro(
library.Get(), context, static_cast<size_t>(load_address),
&relro_start, &relro_size, &relro_fd)) {
- LOG_ERROR("%s: Could not create shared RELRO sharing for %s: %s\n",
- __FUNCTION__, lib_name.c_str(), crazy_context_get_error(context));
+ LOG_ERROR("Could not create shared RELRO sharing for %s: %s\n",
+ lib_name.c_str(), crazy_context_get_error(context));
return false;
}
@@ -580,12 +351,11 @@ jboolean UseSharedRelro(JNIEnv* env,
jobject lib_info_obj) {
String lib_name(env, library_name);
- LOG_INFO("%s: called for %s, lib_info_ref=%p", __FUNCTION__, lib_name.c_str(),
- lib_info_obj);
+ LOG_INFO("Called for %s, lib_info_ref=%p", lib_name.c_str(), lib_info_obj);
ScopedLibrary library;
if (!crazy_library_find_by_name(lib_name.c_str(), library.GetPtr())) {
- LOG_ERROR("%s: Could not find %s", __FUNCTION__, lib_name.c_str());
+ LOG_ERROR("Could not find %s", lib_name.c_str());
return false;
}
@@ -596,48 +366,21 @@ jboolean UseSharedRelro(JNIEnv* env,
s_lib_info_fields.GetRelroInfo(env, lib_info_obj, &relro_start, &relro_size,
&relro_fd);
- LOG_INFO("%s: library=%s relro start=%p size=%p fd=%d", __FUNCTION__,
- lib_name.c_str(), (void*)relro_start, (void*)relro_size, relro_fd);
+ LOG_INFO("library=%s relro start=%p size=%p fd=%d", lib_name.c_str(),
+ (void*)relro_start, (void*)relro_size, relro_fd);
if (!crazy_library_use_shared_relro(library.Get(), context, relro_start,
relro_size, relro_fd)) {
- LOG_ERROR("%s: Could not use shared RELRO for %s: %s", __FUNCTION__,
- lib_name.c_str(), crazy_context_get_error(context));
+ LOG_ERROR("Could not use shared RELRO for %s: %s", lib_name.c_str(),
+ crazy_context_get_error(context));
return false;
}
- LOG_INFO("%s: Library %s using shared RELRO section!", __FUNCTION__,
- lib_name.c_str());
+ LOG_INFO("Library %s using shared RELRO section!", lib_name.c_str());
return true;
}
-jlong GetRandomBaseLoadAddress(JNIEnv* env, jclass clazz, jlong bytes) {
-#if RESERVE_BREAKPAD_GUARD_REGION
- // Add a Breakpad guard region. 16Mb should be comfortably larger than
- // the largest relocation packer saving we expect to encounter.
- static const size_t kBreakpadGuardRegionBytes = 16 * 1024 * 1024;
- bytes += kBreakpadGuardRegionBytes;
-#endif
-
- void* address =
- mmap(NULL, bytes, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if (address == MAP_FAILED) {
- LOG_INFO("%s: Random base load address not determinable\n", __FUNCTION__);
- return 0;
- }
- munmap(address, bytes);
-
-#if RESERVE_BREAKPAD_GUARD_REGION
- // Allow for a Breakpad guard region ahead of the returned address.
- address = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(address) +
- kBreakpadGuardRegionBytes);
-#endif
-
- LOG_INFO("%s: Random base load address is %p\n", __FUNCTION__, address);
- return static_cast<jlong>(reinterpret_cast<uintptr_t>(address));
-}
-
const JNINativeMethod kNativeMethods[] = {
{"nativeLoadLibrary",
"("
@@ -677,53 +420,32 @@ const JNINativeMethod kNativeMethods[] = {
")"
"Z",
reinterpret_cast<void*>(&UseSharedRelro)},
- {"nativeGetRandomBaseLoadAddress",
- "("
- "J"
- ")"
- "J",
- reinterpret_cast<void*>(&GetRandomBaseLoadAddress)},
};
} // namespace
-// JNI_OnLoad() hook called when the linker library is loaded through
-// the regular System.LoadLibrary) API. This shall save the Java VM
-// handle and initialize LibInfo fields.
-jint JNI_OnLoad(JavaVM* vm, void* reserved) {
- LOG_INFO("%s: Entering", __FUNCTION__);
- // Get new JNIEnv
- JNIEnv* env;
- if (JNI_OK != vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_4)) {
- LOG_ERROR("Could not create JNIEnv");
- return -1;
- }
+bool LegacyLinkerJNIInit(JavaVM* vm, JNIEnv* env) {
+ LOG_INFO("Entering");
// Initialize SDK version info.
- LOG_INFO("%s: Retrieving SDK version info", __FUNCTION__);
+ LOG_INFO("Retrieving SDK version info");
if (!InitSDKVersionInfo(env))
- return -1;
+ return false;
// Register native methods.
jclass linker_class;
if (!InitClassReference(env, "org/chromium/base/library_loader/LegacyLinker",
&linker_class))
- return -1;
+ return false;
- LOG_INFO("%s: Registering native methods", __FUNCTION__);
+ LOG_INFO("Registering native methods");
env->RegisterNatives(linker_class, kNativeMethods,
sizeof(kNativeMethods) / sizeof(kNativeMethods[0]));
- // Find LibInfo field ids.
- LOG_INFO("%s: Caching field IDs", __FUNCTION__);
- if (!s_lib_info_fields.Init(env)) {
- return -1;
- }
-
// Resolve and save the Java side Linker callback class and method.
- LOG_INFO("%s: Resolving callback bindings", __FUNCTION__);
+ LOG_INFO("Resolving callback bindings");
if (!s_java_callback_bindings.Init(env, linker_class)) {
- return -1;
+ return false;
}
// Save JavaVM* handle into context.
@@ -732,8 +454,9 @@ jint JNI_OnLoad(JavaVM* vm, void* reserved) {
// Register the function that the crazy linker can call to post code
// for later execution.
- crazy_context_set_callback_poster(context, &PostForLaterExecution, NULL);
+ crazy_context_set_callback_poster(context, &PostForLaterExecution, nullptr);
- LOG_INFO("%s: Done", __FUNCTION__);
- return JNI_VERSION_1_4;
+ return true;
}
+
+} // namespace chromium_android_linker
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