android第三方apk找不到/system/lib64/里面的系统库
平台
RK3288 + Android 9
问题
- 官方原文:
"从 Android 7.0 开始，系统将阻止应用动态链接非公开 NDK 库，这种库可能会导致您的应用崩溃。此行为变更旨在为跨平台更新和不同设备提供统一的应用体验。即使您的代码可能不会链接私有库，但您的应用中的第三方静态库可能会这么做。因此，所有开发者都应进行相应检查，确保他们的应用不会在运行 Android 7.0 的设备上崩溃。如果您的应用使用原生代码，则只能使用公开 NDK API。" - 这样会有什么问题?
很多使用JNI的APP将无法像低版本SDK一样, 正常使用, 在使用7.1的时候, 系统会有相关的提示, 到使用9.0时, 直接崩溃报错.java.lang.UnsatisfiedLinkError: dlopen failed: library "/system/lib/libserial_port.so" needed or dlopened by "/system/lib/libnativeloader.so" is not accessible for the namespace "classloader-namespace"at java.lang.Runtime.loadLibrary0(Runtime.java:1016)at java.lang.System.loadLibrary(System.java:1669)- 1
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常见:UnsatisfiedLinkError
解决方案
方案 1修改APP端
见下文记录7.0加载so文件失败：java.lang.UnsatisfiedLinkError: dlopen failed: library “libsqlite.so” not found
方案 2 修改系统SDK
|-- 错误输出部分代码: bionic/linker/linker.cpp
static bool load_library(android_namespace_t* ns,LoadTask* task,LoadTaskList* load_tasks,int rtld_flags,const std::string& realpath,bool search_linked_namespaces) {off64_t file_offset = task->get_file_offset();const char* name = task->get_name();const android_dlextinfo* extinfo = task->get_extinfo();
if ((file_offset % PAGE_SIZE) != 0) {
DL_ERR(“file offset for the library “%s” is not page-aligned: %” PRId64, name, file_offset);
return false;
}
if (file_offset < 0) {
DL_ERR(“file offset for the library “%s” is negative: %” PRId64, name, file_offset);
return false;
}
struct stat file_stat;
if (TEMP_FAILURE_RETRY(fstat(task->get_fd(), &file_stat)) != 0) {
DL_ERR(“unable to stat file for the library “%s”: %s”, name, strerror(errno));
return false;
}
if (file_offset >= file_stat.st_size) {
DL_ERR(“file offset for the library “%s” >= file size: %” PRId64 " >= %" PRId64,
name, file_offset, file_stat.st_size);
return false;
}
// Check for symlink and other situations where
// file can have different names, unless ANDROID_DLEXT_FORCE_LOAD is set
if (extinfo nullptr || (extinfo->flags & ANDROID_DLEXT_FORCE_LOAD) 0) {
soinfo* si = nullptr;
if (find_loaded_library_by_inode(ns, file_stat, file_offset, search_linked_namespaces, &si)) {
TRACE("library “%s” is already loaded under different name/path “%s” - "
“will return existing soinfo”, name, si->get_realpath());
task->set_soinfo(si);
return true;
}
}
if ((rtld_flags & RTLD_NOLOAD) != 0) {
DL_ERR(“library “%s” wasn’t loaded and RTLD_NOLOAD prevented it”, name);
return false;
}
struct statfs fs_stat;
if (TEMP_FAILURE_RETRY(fstatfs(task->get_fd(), &fs_stat)) != 0) {
DL_ERR(“unable to fstatfs file for the library “%s”: %s”, name, strerror(errno));
return false;
}
// do not check accessibility using realpath if fd is located on tmpfs
// this enables use of memfd_create() for apps
if ((fs_stat.f_type != TMPFS_MAGIC) && (!ns->is_accessible(realpath))) {
// TODO(dimitry): workaround for http://b/26394120 - the grey-list
<span class="token comment">// TODO(dimitry) before O release: add a namespace attribute to have this enabled</span>
<span class="token comment">// only for classloader-namespaces</span>
<span class="token keyword">const</span> soinfo<span class="token operator">*</span> needed_by <span class="token operator">=</span> task<span class="token operator">-</span><span class="token operator">></span><span class="token function">is_dt_needed</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">?</span> task<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_needed_by</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">:</span> <span class="token keyword">nullptr</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">is_greylisted</span><span class="token punctuation">(</span>ns<span class="token punctuation">,</span> name<span class="token punctuation">,</span> needed_by<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span><span class="token comment">// print warning only if needed by non-system library</span><span class="token keyword">if</span> <span class="token punctuation">(</span>needed_by <span class="token operator">==</span> <span class="token keyword">nullptr</span> <span class="token operator">||</span> <span class="token operator">!</span><span class="token function">is_system_library</span><span class="token punctuation">(</span>needed_by<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_realpath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span><span class="token keyword">const</span> soinfo<span class="token operator">*</span> needed_or_dlopened_by <span class="token operator">=</span> task<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_needed_by</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token keyword">const</span> <span class="token keyword">char</span><span class="token operator">*</span> sopath <span class="token operator">=</span> needed_or_dlopened_by <span class="token operator">==</span> <span class="token keyword">nullptr</span> <span class="token operator">?</span> <span class="token string">"(unknown)"</span> <span class="token operator">:</span>needed_or_dlopened_by<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_realpath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token function">DL_WARN_documented_change</span><span class="token punctuation">(</span>__ANDROID_API_N__<span class="token punctuation">,</span><span class="token string">"private-api-enforced-for-api-level-24"</span><span class="token punctuation">,</span><span class="token string">"library \"%s\" (\"%s\") needed or dlopened by \"%s\" "</span><span class="token string">"is not accessible by namespace \"%s\""</span><span class="token punctuation">,</span>name<span class="token punctuation">,</span> realpath<span class="token punctuation">.</span><span class="token function">c_str</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> sopath<span class="token punctuation">,</span> ns<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_name</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token function">add_dlwarning</span><span class="token punctuation">(</span>sopath<span class="token punctuation">,</span> <span class="token string">"unauthorized access to"</span><span class="token punctuation">,</span> name<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{<!-- --></span><span class="token comment">// do not load libraries if they are not accessible for the specified namespace.</span><span class="token keyword">const</span> <span class="token keyword">char</span><span class="token operator">*</span> needed_or_dlopened_by <span class="token operator">=</span> task<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_needed_by</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token keyword">nullptr</span> <span class="token operator">?</span><span class="token string">"(unknown)"</span> <span class="token operator">:</span>task<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_needed_by</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">get_realpath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token function">DL_ERR</span><span class="token punctuation">(</span><span class="token string">"library \"%s\" needed or dlopened by \"%s\" is not accessible for the namespace \"%s\""</span><span class="token punctuation">,</span>name<span class="token punctuation">,</span> needed_or_dlopened_by<span class="token punctuation">,</span> ns<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_name</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">// do not print this if a library is in the list of shared libraries for linked namespaces</span><span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">maybe_accessible_via_namespace_links</span><span class="token punctuation">(</span>ns<span class="token punctuation">,</span> name<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span><span class="token function">PRINT</span><span class="token punctuation">(</span><span class="token string">"library \"%s\" (\"%s\") needed or dlopened by \"%s\" is not accessible for the"</span><span class="token string">" namespace: [name=\"%s\", ld_library_paths=\"%s\", default_library_paths=\"%s\","</span><span class="token string">" permitted_paths=\"%s\"]"</span><span class="token punctuation">,</span>name<span class="token punctuation">,</span> realpath<span class="token punctuation">.</span><span class="token function">c_str</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>needed_or_dlopened_by<span class="token punctuation">,</span>ns<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_name</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>android<span class="token operator">::</span>base<span class="token operator">::</span><span class="token function">Join</span><span class="token punctuation">(</span>ns<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_ld_library_paths</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">':'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">c_str</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>android<span class="token operator">::</span>base<span class="token operator">::</span><span class="token function">Join</span><span class="token punctuation">(</span>ns<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_default_library_paths</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">':'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">c_str</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>android<span class="token operator">::</span>base<span class="token operator">::</span><span class="token function">Join</span><span class="token punctuation">(</span>ns<span class="token operator">-</span><span class="token operator">></span><span class="token function">get_permitted_paths</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token string">':'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">c_str</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">}</span><span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
}
soinfo* si = soinfo_alloc(ns, realpath.c_str(), &file_stat, file_offset, rtld_flags);
if (si == nullptr) {
return false;
}
task->set_soinfo(si);
// Read the ELF header and some of the segments.
if (!task->read(realpath.c_str(), file_stat.st_size)) {
soinfo_free(si);
task->set_soinfo(nullptr);
return false;
}
// find and set DT_RUNPATH and dt_soname
// Note that these field values are temporary and are
// going to be overwritten on soinfo::prelink_image
// with values from PT_LOAD segments.
const ElfReader& elf_reader = task->get_elf_reader();
for (const ElfW(Dyn)* d = elf_reader.dynamic(); d->d_tag != DT_NULL; ++d) {
if (d->d_tag DT_RUNPATH) {
si->set_dt_runpath(elf_reader.get_string(d->d_un.d_val));
}
if (d->d_tag DT_SONAME) {
si->set_soname(elf_reader.get_string(d->d_un.d_val));
}
}
for_each_dt_needed(task->get_elf_reader(), [&](const char* name) {
load_tasks->push_back(LoadTask::create(name, si, ns, task->get_readers_map()));
});
return true;
}
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错误输出:
DL_ERR("library \"%s\" needed or dlopened by \"%s\" is not accessible for the namespace \"%s\"",name, needed_or_dlopened_by, ns->get_name());
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修改的思路是, 不走报错这部分分支的代码, 切入点 is_greylisted
diff --git a/bionic/linker/linker.cpp b/bionic/linker/linker.cpp
old mode 100644
new mode 100755
index c78b9ab..0aa83bc
--- a/bionic/linker/linker.cpp
+++ b/bionic/linker/linker.cpp
@@ -200,12 +200,14 @@ static bool is_greylisted(android_namespace_t* ns, const char* name, const soinf"libui.so","libutils.so","libvorbisidec.so",
+ "libserial_port.so",nullptr};
// If you’re targeting N, you don’t get the greylist.
if (g_greylist_disabled || get_application_target_sdk_version() >= ANDROID_API_N) {
- return false;
+ //make system lib can be loaded.
+ //return false;
}
// if the library needed by a system library - implicitly assume it
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修改点:
- 将调用的SO加入灰名单列表, 这里加了一个libserial_port.so
- 注释判断SDK和灰名单使能判断的返回, 当然, 也可以强制返回 true, 看需求办事
修改后有Warning提示, 忽略:
Warning: library "/system/lib/libserial_port.so" ("/system/lib/libserial_port.so") needed or dlopened by "/system/lib/libnativeloader.so" is not accessible by namespace "classloader-namespace" and will not work when the app moves to API level 24 or later (https://android.googlesource.com/platform/bionic/+/master/private-api-enforced-for-api-level-24) (allowing for now because this app's target API level is still 26)
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已上传资源: linker
使用:
adb root
adb remount
adb push linker /system/bin/
adb reboot
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随着而来的第二个问题:
java.lang.UnsatisfiedLinkError: dlopen failed: library "libc++.so" not foundat java.lang.Runtime.loadLibrary0(Runtime.java:1016)at java.lang.System.loadLibrary(System.java:1669)
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|–bionic/linker/linker.cpp
@@ -2342,6 +2344,10 @@ android_namespace_t* create_namespace(const void* caller_addr,
parse_path(ld_library_path, “:”, &ld_library_paths);
parse_path(default_library_path, “:”, &default_library_paths);
+ if(strcmp(name, “classloader-namespace”) == 0){
+ parse_path("/system/lib", “:”, &default_library_paths);
+ }
parse_path(permitted_when_isolated_path, “:”, &permitted_paths);
android_namespace_t* ns = new (g_namespace_allocator.alloc()) android_namespace_t();
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解决!!
完整补丁: linker_patch.tar.gz
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