/*
* 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.
*/
#pragma once
#include <dlfcn.h>
#include <android/dlext.h>
#include <elf.h>
#include <inttypes.h>
#include <link.h>
#include <sys/stat.h>
#include <unistd.h>
#include "private/bionic_page.h"
#include "linked_list.h"
#include "linker_common_types.h"
#include "linker_logger.h"
#include "linker_soinfo.h"
#include <string>
#include <vector>
#if defined(__LP64__)
#define ELFW(what) ELF64_ ## what
#else
#define ELFW(what) ELF32_ ## what
#endif
// mips64 interprets Elf64_Rel structures' r_info field differently.
// bionic (like other C libraries) has macros that assume regular ELF files,
// but the dynamic linker needs to be able to load mips64 ELF files.
#if defined(__mips__) && defined(__LP64__)
#undef ELF64_R_SYM
#undef ELF64_R_TYPE
#undef ELF64_R_INFO
#define ELF64_R_SYM(info) (((info) >> 0) & 0xffffffff)
#define ELF64_R_SSYM(info) (((info) >> 32) & 0xff)
#define ELF64_R_TYPE3(info) (((info) >> 40) & 0xff)
#define ELF64_R_TYPE2(info) (((info) >> 48) & 0xff)
#define ELF64_R_TYPE(info) (((info) >> 56) & 0xff)
#endif
#define SUPPORTED_DT_FLAGS_1 (DF_1_NOW | DF_1_GLOBAL | DF_1_NODELETE | DF_1_PIE)
// Class used construct version dependency graph.
class VersionTracker {
public:
VersionTracker() = default;
bool init(const soinfo* si_from);
const version_info* get_version_info(ElfW(Versym) source_symver) const;
private:
bool init_verneed(const soinfo* si_from);
bool init_verdef(const soinfo* si_from);
void add_version_info(size_t source_index, ElfW(Word) elf_hash,
const char* ver_name, const soinfo* target_si);
std::vector<version_info> version_infos;
DISALLOW_COPY_AND_ASSIGN(VersionTracker);
};
bool soinfo_do_lookup(soinfo* si_from, const char* name, const version_info* vi,
soinfo** si_found_in, const soinfo_list_t& global_group,
const soinfo_list_t& local_group, const ElfW(Sym)** symbol);
enum RelocationKind {
kRelocAbsolute = 0,
kRelocRelative,
kRelocCopy,
kRelocSymbol,
kRelocMax
};
void count_relocation(RelocationKind kind);
soinfo* get_libdl_info(const char* linker_path, const soinfo& linker_si);
soinfo* find_containing_library(const void* p);
int open_executable(const char* path, off64_t* file_offset, std::string* realpath);
void do_android_get_LD_LIBRARY_PATH(char*, size_t);
void do_android_update_LD_LIBRARY_PATH(const char* ld_library_path);
void* do_dlopen(const char* name,
int flags,
const android_dlextinfo* extinfo,
const void* caller_addr);
int do_dlclose(void* handle);
int do_dl_iterate_phdr(int (*cb)(dl_phdr_info* info, size_t size, void* data), void* data);
#if defined(__arm__)
_Unwind_Ptr do_dl_unwind_find_exidx(_Unwind_Ptr pc, int* pcount);
#endif
bool do_dlsym(void* handle, const char* sym_name,
const char* sym_ver,
const void* caller_addr,
void** symbol);
int do_dladdr(const void* addr, Dl_info* info);
// void ___cfi_slowpath(uint64_t CallSiteTypeId, void *Ptr, void *Ret);
// void ___cfi_slowpath_diag(uint64_t CallSiteTypeId, void *Ptr, void *DiagData, void *Ret);
void ___cfi_fail(uint64_t CallSiteTypeId, void* Ptr, void *DiagData, void *Ret);
void set_application_target_sdk_version(int target);
int 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,
/* This flag instructs linker to enable grey-list workaround for the namespace.
* See http://b/26394120 for details.
*/
ANDROID_NAMESPACE_TYPE_GREYLIST_ENABLED = 0x08000000,
ANDROID_NAMESPACE_TYPE_SHARED_ISOLATED = ANDROID_NAMESPACE_TYPE_SHARED |
ANDROID_NAMESPACE_TYPE_ISOLATED,
};
bool init_anonymous_namespace(const char* shared_lib_sonames, const char* library_search_path);
android_namespace_t* create_namespace(const void* caller_addr,
const char* name,
const char* ld_library_path,
const char* default_library_path,
uint64_t type,
const char* permitted_when_isolated_path,
android_namespace_t* parent_namespace);
bool link_namespaces(android_namespace_t* namespace_from,
android_namespace_t* namespace_to,
const char* shared_lib_sonames);
bool link_namespaces_all_libs(android_namespace_t* namespace_from,
android_namespace_t* namespace_to);
android_namespace_t* get_exported_namespace(const char* name);
void increment_dso_handle_reference_counter(void* dso_handle);
void decrement_dso_handle_reference_counter(void* dso_handle);
void purge_unused_memory();
struct address_space_params {
void* start_addr = nullptr;
size_t reserved_size = 0;
bool must_use_address = false;
};