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Remove linker-namespace functions from the header

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They are intended for platform use only and we shouldn't have them
in the public header file.

Bug: http://b/28174921
Change-Id: Ib9b3d0fa9442cfa2e784a693ad567d1444d774e5
This commit is contained in:
Dimitry Ivanov 2016-05-09 17:37:39 -07:00
parent d2f3ce9c89
commit 41fd29532b
4 changed files with 120 additions and 67 deletions
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66
libc/include/android/dlext.h
View file

@ -1,6 +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
@ -132,70 +132,6 @@ typedef struct {
extern void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo)
__INTRODUCED_IN(21);
/*
* Initializes public and anonymous namespaces. The public_ns_sonames is the list of sonames
* to be included into public namespace separated by colon. Example: "libc.so:libm.so:libdl.so".
* The libraries in this list should be loaded prior to this call.
*
* The anon_ns_library_path is the search path for anonymous namespace. The anonymous namespace
* is used in the case when linker cannot identify the caller of dlopen/dlsym. This happens
* for the code not loaded by dynamic linker; for example calls from the mono-compiled code.
*/
extern bool android_init_namespaces(const char* public_ns_sonames,
const char* anon_ns_library_path);
enum {
/* A regular namespace is the namespace with a custom search path that does
* not impose any restrictions on the location of native libraries.
*/
ANDROID_NAMESPACE_TYPE_REGULAR = 0,
/* An isolated namespace requires all the libraries to be on the search path
* or under permitted_when_isolated_path. The search path is the union of
* ld_library_path and default_library_path.
*/
ANDROID_NAMESPACE_TYPE_ISOLATED = 1,
/* The shared namespace clones the list of libraries of the caller namespace upon creation
* which means that they are shared between namespaces - the caller namespace and the new one
* will use the same copy of a library if it was loaded prior to android_create_namespace call.
*
* Note that libraries loaded after the namespace is created will not be shared.
*
* Shared namespaces can be isolated or regular. Note that they do not inherit the search path nor
* permitted_path from the caller's namespace.
*/
ANDROID_NAMESPACE_TYPE_SHARED = 2,
ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED = ANDROID_NAMESPACE_TYPE_SHARED |
ANDROID_NAMESPACE_TYPE_ISOLATED,
};
/*
* Creates new linker namespace.
* ld_library_path and default_library_path represent the search path
* for the libraries in the namespace.
*
* The libraries in the namespace are searched by folowing order:
* 1. ld_library_path (Think of this as namespace-local LD_LIBRARY_PATH)
* 2. In directories specified by DT_RUNPATH of the "needed by" binary.
* 3. deault_library_path (This of this as namespace-local default library path)
*
* When type is ANDROID_NAMESPACE_TYPE_ISOLATED the resulting namespace requires all of
* the libraries to be on the search path or under the permitted_when_isolated_path;
* the search_path is ld_library_path:default_library_path. Note that the
* permitted_when_isolated_path path is not part of the search_path and
* does not affect the search order. It is a way to allow loading libraries from specific
* locations when using absolute path.
* If a library or any of its dependencies are outside of the permitted_when_isolated_path
* and search_path, and it is not part of the public namespace dlopen will fail.
*/
extern struct android_namespace_t* android_create_namespace(const char* name,
const char* ld_library_path,
const char* default_library_path,
uint64_t type,
const char* permitted_when_isolated_path);
__END_DECLS
#endif /* __ANDROID_DLEXT_H__ */

26
linker/linker.h
View file

@ -470,6 +470,32 @@ size_t linker_get_error_buffer_size();
void set_application_target_sdk_version(uint32_t target);
uint32_t get_application_target_sdk_version();
enum {
/* A regular namespace is the namespace with a custom search path that does
* not impose any restrictions on the location of native libraries.
*/
ANDROID_NAMESPACE_TYPE_REGULAR = 0,
/* An isolated namespace requires all the libraries to be on the search path
* or under permitted_when_isolated_path. The search path is the union of
* ld_library_path and default_library_path.
*/
ANDROID_NAMESPACE_TYPE_ISOLATED = 1,
/* The shared namespace clones the list of libraries of the caller namespace upon creation
* which means that they are shared between namespaces - the caller namespace and the new one
* will use the same copy of a library if it was loaded prior to android_create_namespace call.
*
* Note that libraries loaded after the namespace is created will not be shared.
*
* Shared namespaces can be isolated or regular. Note that they do not inherit the search path nor
* permitted_path from the caller's namespace.
*/
ANDROID_NAMESPACE_TYPE_SHARED = 2,
ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED = ANDROID_NAMESPACE_TYPE_SHARED |
ANDROID_NAMESPACE_TYPE_ISOLATED,
};
bool init_namespaces(const char* public_ns_sonames, const char* anon_ns_library_path);
android_namespace_t* create_namespace(const void* caller_addr, const char* name,
const char* ld_library_path, const char* default_library_path,

92
tests/dlext_private.h Normal file
View file

@ -0,0 +1,92 @@
/*
* Copyright (C) 2016 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.
*/
#ifndef __ANDROID_DLEXT_NAMESPACES_H__
#define __ANDROID_DLEXT_NAMESPACES_H__
#include <android/dlext.h>
__BEGIN_DECLS
/*
* Initializes public and anonymous namespaces. The public_ns_sonames is the list of sonames
* to be included into public namespace separated by colon. Example: "libc.so:libm.so:libdl.so".
* The libraries in this list should be loaded prior to this call.
*
* The anon_ns_library_path is the search path for anonymous namespace. The anonymous namespace
* is used in the case when linker cannot identify the caller of dlopen/dlsym. This happens
* for the code not loaded by dynamic linker; for example calls from the mono-compiled code.
*/
extern bool android_init_namespaces(const char* public_ns_sonames,
const char* anon_ns_library_path);
enum {
/* A regular namespace is the namespace with a custom search path that does
* not impose any restrictions on the location of native libraries.
*/
ANDROID_NAMESPACE_TYPE_REGULAR = 0,
/* An isolated namespace requires all the libraries to be on the search path
* or under permitted_when_isolated_path. The search path is the union of
* ld_library_path and default_library_path.
*/
ANDROID_NAMESPACE_TYPE_ISOLATED = 1,
/* The shared namespace clones the list of libraries of the caller namespace upon creation
* which means that they are shared between namespaces - the caller namespace and the new one
* will use the same copy of a library if it was loaded prior to android_create_namespace call.
*
* Note that libraries loaded after the namespace is created will not be shared.
*
* Shared namespaces can be isolated or regular. Note that they do not inherit the search path nor
* permitted_path from the caller's namespace.
*/
ANDROID_NAMESPACE_TYPE_SHARED = 2,
ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED = ANDROID_NAMESPACE_TYPE_SHARED |
ANDROID_NAMESPACE_TYPE_ISOLATED,
};
/*
* Creates new linker namespace.
* ld_library_path and default_library_path represent the search path
* for the libraries in the namespace.
*
* The libraries in the namespace are searched by folowing order:
* 1. ld_library_path (Think of this as namespace-local LD_LIBRARY_PATH)
* 2. In directories specified by DT_RUNPATH of the "needed by" binary.
* 3. deault_library_path (This of this as namespace-local default library path)
*
* When type is ANDROID_NAMESPACE_TYPE_ISOLATED the resulting namespace requires all of
* the libraries to be on the search path or under the permitted_when_isolated_path;
* the search_path is ld_library_path:default_library_path. Note that the
* permitted_when_isolated_path path is not part of the search_path and
* does not affect the search order. It is a way to allow loading libraries from specific
* locations when using absolute path.
* If a library or any of its dependencies are outside of the permitted_when_isolated_path
* and search_path, and it is not part of the public namespace dlopen will fail.
*/
extern struct android_namespace_t* android_create_namespace(const char* name,
const char* ld_library_path,
const char* default_library_path,
uint64_t type,
const char* permitted_when_isolated_path);
extern void android_set_application_target_sdk_version(uint32_t target);
__END_DECLS
#endif /* __ANDROID_DLEXT_NAMESPACES_H__ */

3
tests/dlext_test.cpp
View file

@ -34,6 +34,7 @@
#include "TemporaryFile.h"
#include "utils.h"
#include "dlext_private.h"
#define ASSERT_DL_NOTNULL(ptr) \
ASSERT_TRUE(ptr != nullptr) << "dlerror: " << dlerror()
@ -743,8 +744,6 @@ TEST(dlext, ns_smoke) {
dlclose(handle2);
}
extern "C" void android_set_application_target_sdk_version(uint32_t target);
TEST(dlext, ns_isolated) {
static const char* root_lib = "libnstest_root_not_isolated.so";
std::string path = std::string("libc.so:libc++.so:libdl.so:libm.so:") + g_public_lib;