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115 lines
5.1 KiB
115 lines
5.1 KiB
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_LIBNATIVELOADER_INCLUDE_NATIVELOADER_DLEXT_NAMESPACES_H_
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#define ART_LIBNATIVELOADER_INCLUDE_NATIVELOADER_DLEXT_NAMESPACES_H_
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#include <android/dlext.h>
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#include <stdbool.h>
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__BEGIN_DECLS
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enum {
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/* A regular namespace is the namespace with a custom search path that does
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* not impose any restrictions on the location of native libraries.
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*/
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ANDROID_NAMESPACE_TYPE_REGULAR = 0,
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/* An isolated namespace requires all the libraries to be on the search path
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* or under permitted_when_isolated_path. The search path is the union of
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* ld_library_path and default_library_path.
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*/
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ANDROID_NAMESPACE_TYPE_ISOLATED = 1,
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/* The shared namespace clones the list of libraries of the caller namespace upon creation
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* which means that they are shared between namespaces - the caller namespace and the new one
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* will use the same copy of a library if it was loaded prior to android_create_namespace call.
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*
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* Note that libraries loaded after the namespace is created will not be shared.
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*
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* Shared namespaces can be isolated or regular. Note that they do not inherit the search path nor
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* permitted_path from the caller's namespace.
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*/
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ANDROID_NAMESPACE_TYPE_SHARED = 2,
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/* This flag instructs linker to enable exempt-list workaround for the namespace.
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* See http://b/26394120 for details.
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*/
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ANDROID_NAMESPACE_TYPE_EXEMPT_LIST_ENABLED = 0x08000000,
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/* This flag instructs linker to use this namespace as the anonymous
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* namespace. The anonymous namespace is used in the case when linker cannot
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* identify the caller of dlopen/dlsym. This happens for the code not loaded
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* by dynamic linker; for example calls from the mono-compiled code. There can
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* be only one anonymous namespace in a process. If there already is an
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* anonymous namespace in the process, using this flag when creating a new
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* namespace causes an error.
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*/
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ANDROID_NAMESPACE_TYPE_ALSO_USED_AS_ANONYMOUS = 0x10000000,
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ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED =
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ANDROID_NAMESPACE_TYPE_SHARED | ANDROID_NAMESPACE_TYPE_ISOLATED,
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};
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/*
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* Creates new linker namespace.
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* ld_library_path and default_library_path represent the search path
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* for the libraries in the namespace.
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*
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* The libraries in the namespace are searched by folowing order:
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* 1. ld_library_path (Think of this as namespace-local LD_LIBRARY_PATH)
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* 2. In directories specified by DT_RUNPATH of the "needed by" binary.
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* 3. deault_library_path (This of this as namespace-local default library path)
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*
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* When type is ANDROID_NAMESPACE_TYPE_ISOLATED the resulting namespace requires all of
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* the libraries to be on the search path or under the permitted_when_isolated_path;
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* the search_path is ld_library_path:default_library_path. Note that the
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* permitted_when_isolated_path path is not part of the search_path and
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* does not affect the search order. It is a way to allow loading libraries from specific
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* locations when using absolute path.
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* If a library or any of its dependencies are outside of the permitted_when_isolated_path
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* and search_path, and it is not part of the public namespace dlopen will fail.
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*/
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extern struct android_namespace_t* android_create_namespace(
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const char* name, const char* ld_library_path, const char* default_library_path, uint64_t type,
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const char* permitted_when_isolated_path, struct android_namespace_t* parent);
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/*
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* Creates a link between namespaces. Every link has list of sonames of
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* shared libraries. These are the libraries which are accessible from
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* namespace 'from' but loaded within namespace 'to' context.
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* When to namespace is nullptr this function establishes a link between
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* 'from' namespace and the default namespace.
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*
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* The lookup order of the libraries in namespaces with links is following:
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* 1. Look inside current namespace using 'this' namespace search path.
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* 2. Look in linked namespaces
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* 2.1. Perform soname check - if library soname is not in the list of shared
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* libraries sonames skip this link, otherwise
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* 2.2. Search library using linked namespace search path. Note that this
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* step will not go deeper into linked namespaces for this library but
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* will do so for DT_NEEDED libraries.
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*/
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extern bool android_link_namespaces(struct android_namespace_t* from,
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struct android_namespace_t* to,
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const char* shared_libs_sonames);
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extern struct android_namespace_t* android_get_exported_namespace(const char* name);
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__END_DECLS
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#endif // ART_LIBNATIVELOADER_INCLUDE_NATIVELOADER_DLEXT_NAMESPACES_H_
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