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gecko-dev/mozglue/android/APKOpen.cpp

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18 KiB
C++
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* This custom library loading code is only meant to be called
* during initialization. As a result, it takes no special
* precautions to be threadsafe. Any of the library loading functions
* like mozload should not be available to other code.
*/
#include <jni.h>
#include <android/log.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/limits.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include "dlfcn.h"
#include "APKOpen.h"
#include <sys/time.h>
#include <sys/syscall.h>
#include <sys/resource.h>
#include <sys/prctl.h>
#include "sqlite3.h"
#include "Linker.h"
#include "BaseProfiler.h"
#include "application.ini.h"
#include "mozilla/arm.h"
#include "mozilla/Bootstrap.h"
#include "mozilla/Printf.h"
#include "mozilla/ProcessType.h"
#include "mozilla/Sprintf.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/Try.h"
#include "mozilla/UniquePtr.h"
#include "XREChildData.h"
/* Android headers don't define RUSAGE_THREAD */
#ifndef RUSAGE_THREAD
# define RUSAGE_THREAD 1
#endif
#ifndef RELEASE_OR_BETA
/* Official builds have the debuggable flag set to false, which disables
* the backtrace dumper from bionic. However, as it is useful for native
* crashes happening before the crash reporter is registered, re-enable
* it on non release builds (i.e. nightly and aurora).
* Using a constructor so that it is re-enabled as soon as libmozglue.so
* is loaded.
*/
__attribute__((constructor)) void make_dumpable() { prctl(PR_SET_DUMPABLE, 1); }
#endif
typedef int mozglueresult;
using LoadGeckoLibsResult =
mozilla::Result<mozilla::Ok, mozilla::BootstrapError>;
enum StartupEvent {
#define mozilla_StartupTimeline_Event(ev, z) ev,
#include "StartupTimeline.h"
#undef mozilla_StartupTimeline_Event
MAX_STARTUP_EVENT_ID
};
using namespace mozilla;
void JNI_Throw(JNIEnv* jenv, const char* classname, const char* msg) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Throw\n");
jclass cls = jenv->FindClass(classname);
if (cls == nullptr) {
__android_log_print(
ANDROID_LOG_ERROR, "GeckoLibLoad",
"Couldn't find exception class (or exception pending) %s\n", classname);
exit(FAILURE);
}
int rc = jenv->ThrowNew(cls, msg);
if (rc < 0) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
"Error throwing exception %s\n", msg);
exit(FAILURE);
}
jenv->DeleteLocalRef(cls);
}
namespace {
JavaVM* sJavaVM;
}
void abortThroughJava(const char* msg) {
struct sigaction sigact = {};
if (__wrap_sigaction(SIGSEGV, nullptr, &sigact)) {
return; // sigaction call failed.
}
Dl_info info = {};
if ((sigact.sa_flags & SA_SIGINFO) &&
__wrap_dladdr(reinterpret_cast<void*>(sigact.sa_sigaction), &info) &&
info.dli_fname && strstr(info.dli_fname, "libxul.so")) {
return; // Existing signal handler is in libxul (i.e. we have crash
// reporter).
}
JNIEnv* env = nullptr;
if (!sJavaVM ||
sJavaVM->AttachCurrentThreadAsDaemon(&env, nullptr) != JNI_OK) {
return;
}
if (!env || env->PushLocalFrame(2) != JNI_OK) {
return;
}
jclass loader = env->FindClass("org/mozilla/gecko/mozglue/GeckoLoader");
if (!loader) {
return;
}
jmethodID method =
env->GetStaticMethodID(loader, "abort", "(Ljava/lang/String;)V");
jstring str = env->NewStringUTF(msg);
if (method && str) {
env->CallStaticVoidMethod(loader, method, str);
}
env->PopLocalFrame(nullptr);
}
Bootstrap::UniquePtr gBootstrap;
#ifndef MOZ_FOLD_LIBS
static void* sqlite_handle = nullptr;
static void* nspr_handle = nullptr;
static void* plc_handle = nullptr;
#else
# define sqlite_handle nss_handle
# define nspr_handle nss_handle
# define plc_handle nss_handle
#endif
static void* nss_handle = nullptr;
static UniquePtr<char[]> getUnpackedLibraryName(const char* libraryName) {
static const char* libdir = getenv("MOZ_ANDROID_LIBDIR");
size_t len = strlen(libdir) + 1 /* path separator */ + strlen(libraryName) +
1; /* null terminator */
auto file = MakeUnique<char[]>(len);
snprintf(file.get(), len, "%s/%s", libdir, libraryName);
return file;
}
static void* dlopenLibrary(const char* libraryName) {
return __wrap_dlopen(getUnpackedLibraryName(libraryName).get(),
RTLD_GLOBAL | RTLD_LAZY);
}
static void EnsureBaseProfilerInitialized() {
// There is no single entry-point into C++ code on Android.
// Instead, GeckoThread and GeckoLibLoader call various functions to load
// libraries one-by-one.
// We want to capture all that library loading in the profiler, so we need to
// kick off the base profiler at the beginning of whichever function is called
// first.
// We currently assume that all these functions are called on the same thread.
static bool sInitialized = false;
if (sInitialized) {
return;
}
// The stack depth we observe here will be determined by the stack of
// whichever caller enters this code first. In practice this means that we may
// miss some root-most frames, which hopefully shouldn't ruin profiling.
int stackBase = 5;
mozilla::baseprofiler::profiler_init(&stackBase);
sInitialized = true;
}
static LoadGeckoLibsResult loadGeckoLibs() {
TimeStamp t0 = TimeStamp::Now();
struct rusage usage1_thread, usage1;
getrusage(RUSAGE_THREAD, &usage1_thread);
getrusage(RUSAGE_SELF, &usage1);
static const char* libxul = getenv("MOZ_ANDROID_LIBDIR_OVERRIDE");
MOZ_TRY_VAR(
gBootstrap,
GetBootstrap(libxul ? libxul : getUnpackedLibraryName("libxul.so").get(),
LibLoadingStrategy::ReadAhead));
TimeStamp t1 = TimeStamp::Now();
struct rusage usage2_thread, usage2;
getrusage(RUSAGE_THREAD, &usage2_thread);
getrusage(RUSAGE_SELF, &usage2);
#define RUSAGE_TIMEDIFF(u1, u2, field) \
((u2.ru_##field.tv_sec - u1.ru_##field.tv_sec) * 1000 + \
(u2.ru_##field.tv_usec - u1.ru_##field.tv_usec) / 1000)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
"Loaded libs in %fms total, %ldms(%ldms) user, "
"%ldms(%ldms) system, %ld(%ld) faults",
(t1 - t0).ToMilliseconds(),
RUSAGE_TIMEDIFF(usage1_thread, usage2_thread, utime),
RUSAGE_TIMEDIFF(usage1, usage2, utime),
RUSAGE_TIMEDIFF(usage1_thread, usage2_thread, stime),
RUSAGE_TIMEDIFF(usage1, usage2, stime),
usage2_thread.ru_majflt - usage1_thread.ru_majflt,
usage2.ru_majflt - usage1.ru_majflt);
gBootstrap->XRE_StartupTimelineRecord(LINKER_INITIALIZED, t0);
gBootstrap->XRE_StartupTimelineRecord(LIBRARIES_LOADED, t1);
return Ok();
}
static mozglueresult loadNSSLibs();
static mozglueresult loadSQLiteLibs() {
if (sqlite_handle) return SUCCESS;
#ifdef MOZ_FOLD_LIBS
if (loadNSSLibs() != SUCCESS) return FAILURE;
#else
sqlite_handle = dlopenLibrary("libmozsqlite3.so");
if (!sqlite_handle) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
"Couldn't get a handle to libmozsqlite3!");
return FAILURE;
}
#endif
return SUCCESS;
}
static mozglueresult loadNSSLibs() {
if (nss_handle && nspr_handle && plc_handle) return SUCCESS;
nss_handle = dlopenLibrary("libnss3.so");
#ifndef MOZ_FOLD_LIBS
nspr_handle = dlopenLibrary("libnspr4.so");
plc_handle = dlopenLibrary("libplc4.so");
#endif
if (!nss_handle) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
"Couldn't get a handle to libnss3!");
return FAILURE;
}
#ifndef MOZ_FOLD_LIBS
if (!nspr_handle) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
"Couldn't get a handle to libnspr4!");
return FAILURE;
}
if (!plc_handle) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
"Couldn't get a handle to libplc4!");
return FAILURE;
}
#endif
return SUCCESS;
}
extern "C" APKOPEN_EXPORT void MOZ_JNICALL
Java_org_mozilla_gecko_mozglue_GeckoLoader_loadGeckoLibsNative(
JNIEnv* jenv, jclass jGeckoAppShellClass) {
EnsureBaseProfilerInitialized();
jenv->GetJavaVM(&sJavaVM);
LoadGeckoLibsResult res = loadGeckoLibs();
if (res.isOk()) {
return;
}
const BootstrapError& errorInfo = res.inspectErr();
auto msg = errorInfo.match(
[](const nsresult& aRv) {
return Smprintf("Error loading Gecko libraries: nsresult 0x%08X",
uint32_t(aRv));
},
[](const DLErrorType& aErr) {
return Smprintf("Error loading Gecko libraries: %s", aErr.get());
});
JNI_Throw(jenv, "java/lang/Exception", msg.get());
}
extern "C" APKOPEN_EXPORT void MOZ_JNICALL
Java_org_mozilla_gecko_mozglue_GeckoLoader_loadSQLiteLibsNative(
JNIEnv* jenv, jclass jGeckoAppShellClass) {
EnsureBaseProfilerInitialized();
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load sqlite start\n");
mozglueresult rv = loadSQLiteLibs();
if (rv != SUCCESS) {
JNI_Throw(jenv, "java/lang/Exception", "Error loading sqlite libraries");
}
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load sqlite done\n");
}
extern "C" APKOPEN_EXPORT void MOZ_JNICALL
Java_org_mozilla_gecko_mozglue_GeckoLoader_loadNSSLibsNative(
JNIEnv* jenv, jclass jGeckoAppShellClass) {
EnsureBaseProfilerInitialized();
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load nss start\n");
mozglueresult rv = loadNSSLibs();
if (rv != SUCCESS) {
JNI_Throw(jenv, "java/lang/Exception", "Error loading nss libraries");
}
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load nss done\n");
}
static char** CreateArgvFromObjectArray(JNIEnv* jenv, jobjectArray jargs,
int* length) {
size_t stringCount = jenv->GetArrayLength(jargs);
if (length) {
*length = stringCount;
}
if (!stringCount) {
return nullptr;
}
char** argv = new char*[stringCount + 1];
argv[stringCount] = nullptr;
for (size_t ix = 0; ix < stringCount; ix++) {
jstring string = (jstring)(jenv->GetObjectArrayElement(jargs, ix));
const char* rawString = jenv->GetStringUTFChars(string, nullptr);
const int strLength = jenv->GetStringUTFLength(string);
argv[ix] = strndup(rawString, strLength);
jenv->ReleaseStringUTFChars(string, rawString);
jenv->DeleteLocalRef(string);
}
return argv;
}
static void FreeArgv(char** argv, int argc) {
for (int ix = 0; ix < argc; ix++) {
// String was allocated with strndup, so need to use free to deallocate.
free(argv[ix]);
}
delete[] (argv);
}
extern "C" APKOPEN_EXPORT void MOZ_JNICALL
Java_org_mozilla_gecko_mozglue_GeckoLoader_nativeRun(
JNIEnv* jenv, jclass jc, jobjectArray jargs, int prefsFd, int prefMapFd,
int ipcFd, int crashFd, bool xpcshell, jstring outFilePath) {
EnsureBaseProfilerInitialized();
int argc = 0;
char** argv = CreateArgvFromObjectArray(jenv, jargs, &argc);
if (ipcFd < 0) {
if (gBootstrap == nullptr) {
FreeArgv(argv, argc);
return;
}
#ifdef MOZ_LINKER
ElfLoader::Singleton.ExpectShutdown(false);
#endif
const char* outFilePathRaw = nullptr;
if (xpcshell) {
MOZ_ASSERT(outFilePath);
outFilePathRaw = jenv->GetStringUTFChars(outFilePath, nullptr);
}
gBootstrap->GeckoStart(jenv, argv, argc, sAppData, xpcshell,
outFilePathRaw);
if (outFilePathRaw) {
jenv->ReleaseStringUTFChars(outFilePath, outFilePathRaw);
}
#ifdef MOZ_LINKER
ElfLoader::Singleton.ExpectShutdown(true);
#endif
} else {
if (argc < 2) {
FreeArgv(argv, argc);
return;
}
SetGeckoProcessType(argv[--argc]);
SetGeckoChildID(argv[--argc]);
gBootstrap->XRE_SetAndroidChildFds(jenv,
{prefsFd, prefMapFd, ipcFd, crashFd});
XREChildData childData;
gBootstrap->XRE_InitChildProcess(argc, argv, &childData);
}
#ifdef MOZ_WIDGET_ANDROID
# ifdef MOZ_PROFILE_GENERATE
gBootstrap->XRE_WriteLLVMProfData();
# endif
#endif
gBootstrap.reset();
FreeArgv(argv, argc);
}
extern "C" APKOPEN_EXPORT mozglueresult ChildProcessInit(int argc,
char* argv[]) {
EnsureBaseProfilerInitialized();
if (argc < 2) {
return FAILURE;
}
SetGeckoProcessType(argv[--argc]);
SetGeckoChildID(argv[--argc]);
if (loadNSSLibs() != SUCCESS) {
return FAILURE;
}
if (loadSQLiteLibs() != SUCCESS) {
return FAILURE;
}
if (loadGeckoLibs().isErr()) {
return FAILURE;
}
XREChildData childData;
return NS_FAILED(gBootstrap->XRE_InitChildProcess(argc, argv, &childData));
}
// Does current process name end with ':media'?
static bool IsMediaProcess() {
pid_t pid = getpid();
char str[256];
SprintfLiteral(str, "/proc/%d/cmdline", pid);
FILE* f = fopen(str, "r");
if (f) {
fgets(str, sizeof(str), f);
fclose(f);
const size_t strLen = strlen(str);
const char suffix[] = ":media";
const size_t suffixLen = sizeof(suffix) - 1;
if (strLen >= suffixLen &&
!strncmp(str + strLen - suffixLen, suffix, suffixLen)) {
return true;
}
}
return false;
}
#ifndef SYS_rt_tgsigqueueinfo
# define SYS_rt_tgsigqueueinfo __NR_rt_tgsigqueueinfo
#endif
/* Copy of http://androidxref.com/7.1.1_r6/xref/bionic/linker/debugger.cpp#262,
* with debuggerd related code stripped.
*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
static void CatchFatalSignals(int num, siginfo_t* info, void* context) {
// It's possible somebody cleared the SA_SIGINFO flag, which would mean
// our "info" arg holds an undefined value.
struct sigaction action = {};
if ((sigaction(num, nullptr, &action) < 0) ||
!(action.sa_flags & SA_SIGINFO)) {
info = nullptr;
}
// We need to return from the signal handler so that debuggerd can dump the
// thread that crashed, but returning here does not guarantee that the signal
// will be thrown again, even for SIGSEGV and friends, since the signal could
// have been sent manually. Resend the signal with rt_tgsigqueueinfo(2) to
// preserve the SA_SIGINFO contents.
signal(num, SIG_DFL);
struct siginfo si;
if (!info) {
memset(&si, 0, sizeof(si));
si.si_code = SI_USER;
si.si_pid = getpid();
si.si_uid = getuid();
info = &si;
} else if (info->si_code >= 0 || info->si_code == SI_TKILL) {
// rt_tgsigqueueinfo(2)'s documentation appears to be incorrect on kernels
// that contain commit 66dd34a (3.9+). The manpage claims to only allow
// negative si_code values that are not SI_TKILL, but 66dd34a changed the
// check to allow all si_code values in calls coming from inside the house.
}
int rc = syscall(SYS_rt_tgsigqueueinfo, getpid(), gettid(), num, info);
if (rc != 0) {
__android_log_print(ANDROID_LOG_FATAL, "mozglue",
"failed to resend signal during crash: %s",
strerror(errno));
_exit(0);
}
}
extern "C" APKOPEN_EXPORT void MOZ_JNICALL
Java_org_mozilla_gecko_mozglue_GeckoLoader_suppressCrashDialog(JNIEnv* jenv,
jclass jc) {
MOZ_RELEASE_ASSERT(IsMediaProcess(),
"Suppress crash dialog only for media process");
// Restoring to SIG_DFL will crash on x86/Android M devices (see bug 1374556)
// so copy Android code
// (http://androidxref.com/7.1.1_r6/xref/bionic/linker/debugger.cpp#302). See
// comments above CatchFatalSignals() for copyright notice.
struct sigaction action;
memset(&action, 0, sizeof(action));
sigemptyset(&action.sa_mask);
action.sa_sigaction = &CatchFatalSignals;
action.sa_flags = SA_RESTART | SA_SIGINFO;
// Use the alternate signal stack if available so we can catch stack
// overflows.
action.sa_flags |= SA_ONSTACK;
sigaction(SIGABRT, &action, nullptr);
sigaction(SIGBUS, &action, nullptr);
sigaction(SIGFPE, &action, nullptr);
sigaction(SIGILL, &action, nullptr);
sigaction(SIGSEGV, &action, nullptr);
#if defined(SIGSTKFLT)
sigaction(SIGSTKFLT, &action, nullptr);
#endif
sigaction(SIGTRAP, &action, nullptr);
}
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