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platform_system_core
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A workaround for apps using custom classloaders 

Allow custom classloaders to load native libraries
from anywhere under /data

Bug: http://b/27588281
Change-Id: Idb87b33361903f52b734ddd0ceaabe1ff9c281eb
This commit is contained in:
Dimitry Ivanov 2016-03-22 13:59:59 -07:00
parent c1b10a9e84
commit 7f9a1aaf05
1 changed files with 16 additions and 2 deletions
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18
libnativeloader/native_loader.cpp
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@ -21,6 +21,7 @@
#ifdef __ANDROID__
#include <android/dlext.h>
#include "cutils/properties.h"
#define LOG_TAG "libnativeloader"
#include "log/log.h"
#endif
@ -38,6 +39,11 @@ namespace android {
#if defined(__ANDROID__)
static constexpr const char* kPublicNativeLibrariesConfig = "/system/etc/public.libraries.txt";
static bool namespace_workaround_enabled(int32_t target_sdk_version) {
// target_sdk_version = 0 is another way of saying "target current sdk level"
return target_sdk_version != 0 && target_sdk_version <= 23;
}
class LibraryNamespaces {
public:
LibraryNamespaces() : initialized_(false) { }
@ -54,6 +60,14 @@ class LibraryNamespaces {
if (java_permitted_path != nullptr) {
ScopedUtfChars path(env, java_permitted_path);
permitted_path = path.c_str();
} else {
// (http://b/27588281) This is a workaround for apps using custom
// classloaders and calling System.load() with an absolute path which
// is outside of the classloader library search path.
//
// This part effectively allows such a classloader to access anything
// under /data
permitted_path = "/data";
}
if (!initialized_ && !InitPublicNamespace(library_path.c_str(), target_sdk_version)) {
@ -74,7 +88,7 @@ class LibraryNamespaces {
nullptr,
library_path.c_str(),
namespace_type,
java_permitted_path != nullptr ?
!permitted_path.empty() ?
permitted_path.c_str() :
nullptr);
@ -128,7 +142,7 @@ class LibraryNamespaces {
// TODO (dimitry): This is a workaround for http://b/26436837
// will be removed before the release.
if (target_sdk_version <= 23) {
if (namespace_workaround_enabled(target_sdk_version)) {
// check if libart.so is loaded.
void* handle = dlopen("libart.so", RTLD_NOW | RTLD_NOLOAD);
if (handle != nullptr) {