Fix symbol lookup order during relocation
Relocate symbol against DF_1_GLOBAL shared libraries
loaded before this shared library. This includes
main executable, ld_preloads and other libraries
that have DF_1_GLOBAL flag set.
Bug: 2643900
Bug: 15432753
Bug: 18186310
(cherry picked from commit d225a5e652)
Change-Id: I4e889cdf2dfbf8230b0790053d311ee6b0d0ee2d
This commit is contained in:
Dmitriy Ivanov
parent
bf3d5ef5fd
commit
976402cca1
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@ -36,6 +36,12 @@ class LinkedList {
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clear();
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}
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LinkedList(LinkedList&& that) {
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this->head_ = that.head_;
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this->tail_ = that.tail_;
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that.head_ = that.tail_ = nullptr;
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}
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void push_front(T* const element) {
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LinkedListEntry<T>* new_entry = Allocator::alloc();
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new_entry->next = head_;
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@ -140,6 +146,12 @@ class LinkedList {
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return false;
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}
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static LinkedList make_list(T* const element) {
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LinkedList<T, Allocator> one_element_list;
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one_element_list.push_back(element);
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return one_element_list;
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}
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private:
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LinkedListEntry<T>* head_;
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LinkedListEntry<T>* tail_;
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@ -282,7 +282,7 @@ static void protect_data(int protection) {
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g_soinfo_links_allocator.protect_all(protection);
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}
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static soinfo* soinfo_alloc(const char* name, struct stat* file_stat, off64_t file_offset, int rtld_flags) {
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static soinfo* soinfo_alloc(const char* name, struct stat* file_stat, off64_t file_offset, uint32_t rtld_flags) {
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if (strlen(name) >= SOINFO_NAME_LEN) {
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DL_ERR("library name \"%s\" too long", name);
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return nullptr;
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@ -481,7 +481,8 @@ static unsigned elfhash(const char* _name) {
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return h;
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}
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static ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, const soinfo::soinfo_list_t& local_group) {
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static ElfW(Sym)* soinfo_do_lookup(soinfo* si_from, const char* name, soinfo** si_found_in,
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const soinfo::soinfo_list_t& global_group, const soinfo::soinfo_list_t& local_group) {
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unsigned elf_hash = elfhash(name);
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ElfW(Sym)* s = nullptr;
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@ -496,49 +497,40 @@ static ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, c
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* Note that this is unlikely since static linker avoids generating
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* relocations for -Bsymbolic linked dynamic executables.
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*/
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if (si->has_DT_SYMBOLIC) {
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DEBUG("%s: looking up %s in local scope (DT_SYMBOLIC)", si->name, name);
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s = soinfo_elf_lookup(si, elf_hash, name);
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if (si_from->has_DT_SYMBOLIC) {
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DEBUG("%s: looking up %s in local scope (DT_SYMBOLIC)", si_from->name, name);
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s = soinfo_elf_lookup(si_from, elf_hash, name);
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if (s != nullptr) {
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*lsi = si;
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*si_found_in = si_from;
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}
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}
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if (s == nullptr && somain != nullptr) {
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// 1. Look for it in the main executable unless we already did.
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if (si != somain || !si->has_DT_SYMBOLIC) {
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DEBUG("%s: looking up %s in executable %s",
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si->name, name, somain->name);
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s = soinfo_elf_lookup(somain, elf_hash, name);
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// 1. Look for it in global_group
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if (s == nullptr) {
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global_group.visit([&](soinfo* global_si) {
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DEBUG("%s: looking up %s in %s (from global group)", si_from->name, name, global_si->name);
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s = soinfo_elf_lookup(global_si, elf_hash, name);
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if (s != nullptr) {
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*lsi = somain;
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*si_found_in = global_si;
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return false;
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}
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}
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// 2. Look for it in the ld_preloads
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if (s == nullptr) {
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for (int i = 0; g_ld_preloads[i] != NULL; i++) {
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s = soinfo_elf_lookup(g_ld_preloads[i], elf_hash, name);
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if (s != nullptr) {
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*lsi = g_ld_preloads[i];
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break;
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}
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}
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}
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return true;
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});
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}
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// 3. Look for it in the local group
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// 2. Look for it in the local group
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if (s == nullptr) {
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local_group.visit([&](soinfo* local_si) {
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if (local_si == si && si->has_DT_SYMBOLIC) {
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if (local_si == si_from && si_from->has_DT_SYMBOLIC) {
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// we already did this - skip
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return true;
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}
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DEBUG("%s: looking up %s in %s (from local group)", si->name, name, local_si->name);
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DEBUG("%s: looking up %s in %s (from local group)", si_from->name, name, local_si->name);
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s = soinfo_elf_lookup(local_si, elf_hash, name);
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if (s != nullptr) {
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*lsi = local_si;
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*si_found_in = local_si;
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return false;
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}
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@ -549,9 +541,9 @@ static ElfW(Sym)* soinfo_do_lookup(soinfo* si, const char* name, soinfo** lsi, c
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if (s != nullptr) {
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TRACE_TYPE(LOOKUP, "si %s sym %s s->st_value = %p, "
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"found in %s, base = %p, load bias = %p",
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si->name, name, reinterpret_cast<void*>(s->st_value),
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(*lsi)->name, reinterpret_cast<void*>((*lsi)->base),
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reinterpret_cast<void*>((*lsi)->load_bias));
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si_from->name, name, reinterpret_cast<void*>(s->st_value),
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(*si_found_in)->name, reinterpret_cast<void*>((*si_found_in)->base),
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reinterpret_cast<void*>((*si_found_in)->load_bias));
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}
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return s;
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@ -916,6 +908,24 @@ static bool is_recursive(soinfo* si, soinfo* parent) {
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});
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}
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// TODO: this is slightly unusual way to construct
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// the global group for relocation. Not every RTLD_GLOBAL
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// library is included in this group for backwards-compatibility
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// reasons.
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//
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// This group consists of the main executable, LD_PRELOADs
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// and libraries with the DF_1_GLOBAL flag set.
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static soinfo::soinfo_list_t make_global_group() {
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soinfo::soinfo_list_t global_group;
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for (soinfo* si = somain; si != nullptr; si = si->next) {
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if ((si->get_dt_flags_1() & DF_1_GLOBAL) != 0) {
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global_group.push_back(si);
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}
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}
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return global_group;
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}
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static bool find_libraries(soinfo* start_with, const char* const library_names[], size_t library_names_count, soinfo* soinfos[],
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soinfo* ld_preloads[], size_t ld_preloads_count, int rtld_flags, const android_dlextinfo* extinfo) {
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// Step 0: prepare.
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@ -925,6 +935,9 @@ static bool find_libraries(soinfo* start_with, const char* const library_names[]
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load_tasks.push_back(LoadTask::create(name, start_with));
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}
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// Construct global_group.
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soinfo::soinfo_list_t global_group = make_global_group();
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// If soinfos array is null allocate one on stack.
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// The array is needed in case of failure; for example
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// when library_names[] = {libone.so, libtwo.so} and libone.so
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@ -973,6 +986,11 @@ static bool find_libraries(soinfo* start_with, const char* const library_names[]
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// When ld_preloads is not null, the first
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// ld_preloads_count libs are in fact ld_preloads.
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if (ld_preloads != nullptr && soinfos_count < ld_preloads_count) {
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// Add LD_PRELOADed libraries to the global group for future runs.
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// There is no need to explicitly add them to the global group
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// for this run because they are going to appear in the local
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// group in the correct order.
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si->set_dt_flags_1(si->get_dt_flags_1() | DF_1_GLOBAL);
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ld_preloads[soinfos_count] = si;
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}
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@ -993,7 +1011,7 @@ static bool find_libraries(soinfo* start_with, const char* const library_names[]
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bool linked = local_group.visit([&](soinfo* si) {
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if ((si->flags & FLAG_LINKED) == 0) {
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if (!si->LinkImage(local_group, extinfo)) {
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if (!si->LinkImage(global_group, local_group, extinfo)) {
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return false;
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}
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si->flags |= FLAG_LINKED;
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@ -1128,7 +1146,7 @@ static ElfW(Addr) call_ifunc_resolver(ElfW(Addr) resolver_addr) {
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}
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#if defined(USE_RELA)
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int soinfo::Relocate(ElfW(Rela)* rela, unsigned count, const soinfo_list_t& local_group) {
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int soinfo::Relocate(ElfW(Rela)* rela, unsigned count, const soinfo_list_t& global_group, const soinfo_list_t& local_group) {
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for (size_t idx = 0; idx < count; ++idx, ++rela) {
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unsigned type = ELFW(R_TYPE)(rela->r_info);
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unsigned sym = ELFW(R_SYM)(rela->r_info);
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@ -1146,7 +1164,7 @@ int soinfo::Relocate(ElfW(Rela)* rela, unsigned count, const soinfo_list_t& loca
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if (sym != 0) {
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sym_name = get_string(symtab[sym].st_name);
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s = soinfo_do_lookup(this, sym_name, &lsi, local_group);
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s = soinfo_do_lookup(this, sym_name, &lsi, global_group,local_group);
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if (s == nullptr) {
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// We only allow an undefined symbol if this is a weak reference...
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s = &symtab[sym];
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@ -1405,7 +1423,7 @@ int soinfo::Relocate(ElfW(Rela)* rela, unsigned count, const soinfo_list_t& loca
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}
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#else // REL, not RELA.
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int soinfo::Relocate(ElfW(Rel)* rel, unsigned count, const soinfo_list_t& local_group) {
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int soinfo::Relocate(ElfW(Rel)* rel, unsigned count, const soinfo_list_t& global_group, const soinfo_list_t& local_group) {
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for (size_t idx = 0; idx < count; ++idx, ++rel) {
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unsigned type = ELFW(R_TYPE)(rel->r_info);
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// TODO: don't use unsigned for 'sym'. Use uint32_t or ElfW(Addr) instead.
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@ -1424,7 +1442,7 @@ int soinfo::Relocate(ElfW(Rel)* rel, unsigned count, const soinfo_list_t& local_
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if (sym != 0) {
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sym_name = get_string(symtab[sym].st_name);
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s = soinfo_do_lookup(this, sym_name, &lsi, local_group);
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s = soinfo_do_lookup(this, sym_name, &lsi, global_group, local_group);
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if (s == nullptr) {
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// We only allow an undefined symbol if this is a weak reference...
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s = &symtab[sym];
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@ -1610,7 +1628,7 @@ int soinfo::Relocate(ElfW(Rel)* rel, unsigned count, const soinfo_list_t& local_
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#endif
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#if defined(__mips__)
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static bool mips_relocate_got(soinfo* si, const soinfo::soinfo_list_t& local_group) {
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static bool mips_relocate_got(soinfo* si, const soinfo::soinfo_list_t& global_group, const soinfo::soinfo_list_t& local_group) {
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ElfW(Addr)** got = si->plt_got;
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if (got == nullptr) {
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return true;
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@ -1643,7 +1661,7 @@ static bool mips_relocate_got(soinfo* si, const soinfo::soinfo_list_t& local_gro
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// This is an undefined reference... try to locate it.
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const char* sym_name = si->get_string(sym->st_name);
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soinfo* lsi = nullptr;
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ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, local_group);
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ElfW(Sym)* s = soinfo_do_lookup(si, sym_name, &lsi, global_group, local_group);
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if (s == nullptr) {
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// We only allow an undefined symbol if this is a weak reference.
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s = &symtab[g];
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@ -1783,7 +1801,7 @@ void soinfo::remove_all_links() {
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children.clear();
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}
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dev_t soinfo::get_st_dev() {
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dev_t soinfo::get_st_dev() const {
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if (has_min_version(0)) {
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return st_dev;
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}
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@ -1791,7 +1809,7 @@ dev_t soinfo::get_st_dev() {
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return 0;
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};
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ino_t soinfo::get_st_ino() {
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ino_t soinfo::get_st_ino() const {
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if (has_min_version(0)) {
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return st_ino;
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}
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@ -1799,7 +1817,7 @@ ino_t soinfo::get_st_ino() {
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return 0;
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}
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off64_t soinfo::get_file_offset() {
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off64_t soinfo::get_file_offset() const {
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if (has_min_version(1)) {
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return file_offset;
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}
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@ -1807,7 +1825,7 @@ off64_t soinfo::get_file_offset() {
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return 0;
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}
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int soinfo::get_rtld_flags() {
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uint32_t soinfo::get_rtld_flags() const {
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if (has_min_version(1)) {
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return rtld_flags;
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}
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@ -1815,6 +1833,27 @@ int soinfo::get_rtld_flags() {
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return 0;
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}
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uint32_t soinfo::get_dt_flags_1() const {
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if (has_min_version(1)) {
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return dt_flags_1;
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}
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return 0;
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}
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void soinfo::set_dt_flags_1(uint32_t dt_flags_1) {
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if (has_min_version(1)) {
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if ((dt_flags_1 & DF_1_GLOBAL) != 0) {
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rtld_flags |= RTLD_GLOBAL;
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}
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if ((dt_flags_1 & DF_1_NODELETE) != 0) {
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rtld_flags |= RTLD_NODELETE;
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}
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this->dt_flags_1 = dt_flags_1;
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}
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}
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// This is a return on get_children()/get_parents() if
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// 'this->flags' does not have FLAG_NEW_SOINFO set.
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static soinfo::soinfo_list_t g_empty_list;
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@ -1852,8 +1891,9 @@ const char* soinfo::get_string(ElfW(Word) index) const {
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}
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bool soinfo::can_unload() const {
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return (rtld_flags & (RTLD_NODELETE | RTLD_GLOBAL)) == 0;
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return (get_rtld_flags() & (RTLD_NODELETE | RTLD_GLOBAL)) == 0;
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}
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/* Force any of the closed stdin, stdout and stderr to be associated with
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/dev/null. */
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static int nullify_closed_stdio() {
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@ -2154,16 +2194,9 @@ bool soinfo::PrelinkImage() {
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break;
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case DT_FLAGS_1:
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if ((d->d_un.d_val & DF_1_GLOBAL) != 0) {
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rtld_flags |= RTLD_GLOBAL;
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}
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set_dt_flags_1(d->d_un.d_val);
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if ((d->d_un.d_val & DF_1_NODELETE) != 0) {
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rtld_flags |= RTLD_NODELETE;
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}
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// TODO: Implement other flags
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if ((d->d_un.d_val & ~(DF_1_NOW | DF_1_GLOBAL | DF_1_NODELETE)) != 0) {
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if ((d->d_un.d_val & ~SUPPORTED_DT_FLAGS_1) != 0) {
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DL_WARN("Unsupported flags DT_FLAGS_1=%p", reinterpret_cast<void*>(d->d_un.d_val));
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}
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break;
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@ -2236,7 +2269,7 @@ bool soinfo::PrelinkImage() {
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return true;
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}
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bool soinfo::LinkImage(const soinfo_list_t& local_group, const android_dlextinfo* extinfo) {
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bool soinfo::LinkImage(const soinfo_list_t& global_group, const soinfo_list_t& local_group, const android_dlextinfo* extinfo) {
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#if !defined(__LP64__)
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if (has_text_relocations) {
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@ -2255,33 +2288,33 @@ bool soinfo::LinkImage(const soinfo_list_t& local_group, const android_dlextinfo
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#if defined(USE_RELA)
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if (rela != nullptr) {
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DEBUG("[ relocating %s ]", name);
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if (Relocate(rela, rela_count, local_group)) {
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if (Relocate(rela, rela_count, global_group, local_group)) {
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return false;
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}
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}
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if (plt_rela != nullptr) {
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DEBUG("[ relocating %s plt ]", name);
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if (Relocate(plt_rela, plt_rela_count, local_group)) {
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if (Relocate(plt_rela, plt_rela_count, global_group, local_group)) {
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return false;
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}
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}
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#else
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if (rel != nullptr) {
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DEBUG("[ relocating %s ]", name);
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if (Relocate(rel, rel_count, local_group)) {
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if (Relocate(rel, rel_count, global_group, local_group)) {
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return false;
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}
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}
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if (plt_rel != nullptr) {
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DEBUG("[ relocating %s plt ]", name);
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if (Relocate(plt_rel, plt_rel_count, local_group)) {
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if (Relocate(plt_rel, plt_rel_count, global_group, local_group)) {
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return false;
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}
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}
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#endif
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#if defined(__mips__)
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if (!mips_relocate_got(this, local_group)) {
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if (!mips_relocate_got(this, global_group, local_group)) {
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return false;
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}
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#endif
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@ -2348,7 +2381,7 @@ static void add_vdso(KernelArgumentBlock& args __unused) {
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si->load_bias = get_elf_exec_load_bias(ehdr_vdso);
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si->PrelinkImage();
|
||||
si->LinkImage(g_empty_list, nullptr);
|
||||
si->LinkImage(g_empty_list, soinfo::soinfo_list_t::make_list(si), nullptr);
|
||||
#endif
|
||||
}
|
||||
|
||||
|
|
@ -2479,6 +2512,9 @@ static ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(
|
|||
|
||||
si->PrelinkImage();
|
||||
|
||||
// add somain to global group
|
||||
si->set_dt_flags_1(si->get_dt_flags_1() | DF_1_GLOBAL);
|
||||
|
||||
// Load ld_preloads and dependencies.
|
||||
StringLinkedList needed_library_name_list;
|
||||
size_t needed_libraries_count = 0;
|
||||
|
|
@ -2622,7 +2658,13 @@ extern "C" ElfW(Addr) __linker_init(void* raw_args) {
|
|||
linker_so.phnum = elf_hdr->e_phnum;
|
||||
linker_so.flags |= FLAG_LINKER;
|
||||
|
||||
if (!(linker_so.PrelinkImage() && linker_so.LinkImage(g_empty_list, nullptr))) {
|
||||
// This might not be obvious... The reasons why we pass g_empty_list
|
||||
// in place of local_group here are (1) we do not really need it, because
|
||||
// linker is built with DT_SYMBOLIC and therefore relocates its symbols against
|
||||
// itself without having to look into local_group and (2) allocators
|
||||
// are not yet initialized, and therefore we cannot use linked_list.push_*
|
||||
// functions at this point.
|
||||
if (!(linker_so.PrelinkImage() && linker_so.LinkImage(g_empty_list, g_empty_list, nullptr))) {
|
||||
// It would be nice to print an error message, but if the linker
|
||||
// can't link itself, there's no guarantee that we'll be able to
|
||||
// call write() (because it involves a GOT reference). We may as
|
||||
|
|
|
|||
|
|
@ -89,7 +89,9 @@
|
|||
#define FLAG_LINKER 0x00000010 // The linker itself
|
||||
#define FLAG_NEW_SOINFO 0x40000000 // new soinfo format
|
||||
|
||||
#define SOINFO_VERSION 0
|
||||
#define SUPPORTED_DT_FLAGS_1 (DF_1_NOW | DF_1_GLOBAL | DF_1_NODELETE)
|
||||
|
||||
#define SOINFO_VERSION 1
|
||||
|
||||
#define SOINFO_NAME_LEN 128
|
||||
|
||||
|
|
@ -207,16 +209,18 @@ struct soinfo {
|
|||
void CallDestructors();
|
||||
void CallPreInitConstructors();
|
||||
bool PrelinkImage();
|
||||
bool LinkImage(const soinfo_list_t& local_group, const android_dlextinfo* extinfo);
|
||||
bool LinkImage(const soinfo_list_t& global_group, const soinfo_list_t& local_group, const android_dlextinfo* extinfo);
|
||||
|
||||
void add_child(soinfo* child);
|
||||
void remove_all_links();
|
||||
|
||||
ino_t get_st_ino();
|
||||
dev_t get_st_dev();
|
||||
off64_t get_file_offset();
|
||||
ino_t get_st_ino() const;
|
||||
dev_t get_st_dev() const;
|
||||
off64_t get_file_offset() const;
|
||||
|
||||
int get_rtld_flags();
|
||||
uint32_t get_rtld_flags() const;
|
||||
uint32_t get_dt_flags_1() const;
|
||||
void set_dt_flags_1(uint32_t dt_flags_1);
|
||||
|
||||
soinfo_list_t& get_children();
|
||||
soinfo_list_t& get_parents();
|
||||
|
|
@ -234,9 +238,9 @@ struct soinfo {
|
|||
void CallArray(const char* array_name, linker_function_t* functions, size_t count, bool reverse);
|
||||
void CallFunction(const char* function_name, linker_function_t function);
|
||||
#if defined(USE_RELA)
|
||||
int Relocate(ElfW(Rela)* rela, unsigned count, const soinfo_list_t& local_group);
|
||||
int Relocate(ElfW(Rela)* rela, unsigned count, const soinfo_list_t& global_group, const soinfo_list_t& local_group);
|
||||
#else
|
||||
int Relocate(ElfW(Rel)* rel, unsigned count, const soinfo_list_t& local_group);
|
||||
int Relocate(ElfW(Rel)* rel, unsigned count, const soinfo_list_t& global_group, const soinfo_list_t& local_group);
|
||||
#endif
|
||||
|
||||
private:
|
||||
|
|
@ -254,7 +258,8 @@ struct soinfo {
|
|||
|
||||
// version >= 1
|
||||
off64_t file_offset;
|
||||
int rtld_flags;
|
||||
uint32_t rtld_flags;
|
||||
uint32_t dt_flags_1;
|
||||
size_t strtab_size;
|
||||
|
||||
friend soinfo* get_libdl_info();
|
||||
|
|
|
|||
|
|
@ -225,6 +225,7 @@ bionic-unit-tests_whole_static_libraries := \
|
|||
|
||||
bionic-unit-tests_src_files := \
|
||||
atexit_test.cpp \
|
||||
dl_test.cpp \
|
||||
dlext_test.cpp \
|
||||
dlfcn_test.cpp \
|
||||
|
||||
|
|
@ -237,8 +238,7 @@ bionic-unit-tests_conlyflags := \
|
|||
bionic-unit-tests_cppflags := $(test_cppflags)
|
||||
|
||||
bionic-unit-tests_ldflags := \
|
||||
-Wl,--export-dynamic \
|
||||
-Wl,-u,DlSymTestFunction \
|
||||
-Wl,--export-dynamic
|
||||
|
||||
bionic-unit-tests_c_includes := \
|
||||
bionic/libc \
|
||||
|
|
@ -247,6 +247,9 @@ bionic-unit-tests_c_includes := \
|
|||
bionic-unit-tests_shared_libraries_target := \
|
||||
libdl \
|
||||
libpagemap \
|
||||
libdl_preempt_test_1 \
|
||||
libdl_preempt_test_2 \
|
||||
libdl_test_df_1_global
|
||||
|
||||
module := bionic-unit-tests
|
||||
module_tag := optional
|
||||
|
|
@ -286,6 +289,12 @@ ifeq ($(HOST_OS)-$(HOST_ARCH),$(filter $(HOST_OS)-$(HOST_ARCH),linux-x86 linux-x
|
|||
bionic-unit-tests-glibc_src_files := \
|
||||
atexit_test.cpp \
|
||||
dlfcn_test.cpp \
|
||||
dl_test.cpp \
|
||||
|
||||
bionic-unit-tests-glibc_shared_libraries := \
|
||||
libdl_preempt_test_1 \
|
||||
libdl_preempt_test_2 \
|
||||
libdl_test_df_1_global
|
||||
|
||||
bionic-unit-tests-glibc_whole_static_libraries := \
|
||||
libBionicStandardTests \
|
||||
|
|
|
|||
|
|
@ -0,0 +1,72 @@
|
|||
/*
|
||||
* Copyright (C) 2012 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.
|
||||
*/
|
||||
|
||||
#include <gtest/gtest.h>
|
||||
|
||||
#include <dlfcn.h>
|
||||
#include <libgen.h>
|
||||
#include <limits.h>
|
||||
#include <stdio.h>
|
||||
#include <stdint.h>
|
||||
|
||||
#include <string>
|
||||
|
||||
extern "C" int main_global_default_serial() {
|
||||
return 3370318;
|
||||
}
|
||||
|
||||
extern "C" int main_global_protected_serial() {
|
||||
return 2716057;
|
||||
}
|
||||
|
||||
// The following functions are defined in DT_NEEDED
|
||||
// libdl_preempt_test.so library.
|
||||
|
||||
// This one calls main_global_default_serial
|
||||
extern "C" int main_global_default_get_serial();
|
||||
|
||||
// This one calls main_global_protected_serial
|
||||
extern "C" int main_global_protected_get_serial();
|
||||
|
||||
// This one calls lib_global_default_serial
|
||||
extern "C" int lib_global_default_get_serial();
|
||||
|
||||
// This one calls lib_global_protected_serial
|
||||
extern "C" int lib_global_protected_get_serial();
|
||||
|
||||
// This test verifies that the global default function
|
||||
// main_global_default_serial() is preempted by
|
||||
// the function defined above.
|
||||
TEST(dl, main_preempts_global_default) {
|
||||
ASSERT_EQ(3370318, main_global_default_get_serial());
|
||||
}
|
||||
|
||||
// This one makes sure that the global protected
|
||||
// symbols do not get preempted
|
||||
TEST(dl, main_does_not_preempt_global_protected) {
|
||||
ASSERT_EQ(3370318, main_global_protected_get_serial());
|
||||
}
|
||||
|
||||
// check same things for lib
|
||||
TEST(dl, lib_preempts_global_default) {
|
||||
ASSERT_EQ(3370318, lib_global_default_get_serial());
|
||||
}
|
||||
|
||||
TEST(dl, lib_does_not_preempt_global_protected) {
|
||||
ASSERT_EQ(3370318, lib_global_protected_get_serial());
|
||||
}
|
||||
|
||||
// TODO: Add tests for LD_PRELOADs
|
||||
|
|
@ -499,6 +499,20 @@ TEST(dlfcn, dlopen_nodelete_dt_flags_1) {
|
|||
ASSERT_TRUE(!is_unloaded);
|
||||
}
|
||||
|
||||
TEST(dlfcn, dlsym_df_1_global) {
|
||||
#if !defined(__arm__)
|
||||
void* handle = dlopen("libtest_dlsym_df_1_global.so", RTLD_NOW);
|
||||
ASSERT_TRUE(handle != nullptr) << dlerror();
|
||||
int (*get_answer)();
|
||||
get_answer = reinterpret_cast<int (*)()>(dlsym(handle, "dl_df_1_global_get_answer"));
|
||||
ASSERT_TRUE(get_answer != nullptr) << dlerror();
|
||||
ASSERT_EQ(42, get_answer());
|
||||
ASSERT_EQ(0, dlclose(handle));
|
||||
#else
|
||||
GTEST_LOG_(INFO) << "This test does nothing on arm (to be reenabled once b/18137520 or b/18130452 are fixed).\n";
|
||||
#endif
|
||||
}
|
||||
|
||||
TEST(dlfcn, dlopen_failure) {
|
||||
void* self = dlopen("/does/not/exist", RTLD_NOW);
|
||||
ASSERT_TRUE(self == NULL);
|
||||
|
|
|
|||
|
|
@ -289,6 +289,42 @@ libtest_atexit_src_files := \
|
|||
module := libtest_atexit
|
||||
include $(LOCAL_PATH)/Android.build.testlib.mk
|
||||
|
||||
# -----------------------------------------------------------------------------
|
||||
# This library is used by dl_load test to check symbol preempting
|
||||
# by main executable
|
||||
# -----------------------------------------------------------------------------
|
||||
libdl_preempt_test_1_src_files := dl_preempt_library_1.cpp
|
||||
|
||||
module := libdl_preempt_test_1
|
||||
include $(LOCAL_PATH)/Android.build.testlib.mk
|
||||
|
||||
# -----------------------------------------------------------------------------
|
||||
# This library is used by dl_load test to check symbol preempting
|
||||
# by libdl_preempt_test_1.so
|
||||
# -----------------------------------------------------------------------------
|
||||
libdl_preempt_test_2_src_files := dl_preempt_library_2.cpp
|
||||
|
||||
module := libdl_preempt_test_2
|
||||
include $(LOCAL_PATH)/Android.build.testlib.mk
|
||||
|
||||
# -----------------------------------------------------------------------------
|
||||
# Library with DF_1_GLOBAL
|
||||
# -----------------------------------------------------------------------------
|
||||
# TODO: re-enable arm once b/18137520 or b/18130452 are fixed
|
||||
ifeq ($(filter $(TARGET_ARCH),arm),)
|
||||
libdl_test_df_1_global_src_files := dl_df_1_global.cpp
|
||||
libdl_test_df_1_global_ldflags := -fuse-ld=bfd -Wl,-z,global
|
||||
module := libdl_test_df_1_global
|
||||
include $(LOCAL_PATH)/Android.build.testlib.mk
|
||||
endif
|
||||
|
||||
# -----------------------------------------------------------------------------
|
||||
# Library using symbol from libdl_test_df_1_global
|
||||
# -----------------------------------------------------------------------------
|
||||
libtest_dlsym_df_1_global_src_files := dl_df_1_use_global.cpp
|
||||
module := libtest_dlsym_df_1_global
|
||||
include $(LOCAL_PATH)/Android.build.testlib.mk
|
||||
|
||||
# -----------------------------------------------------------------------------
|
||||
# Library with weak function
|
||||
# -----------------------------------------------------------------------------
|
||||
|
|
|
|||
|
|
@ -0,0 +1,19 @@
|
|||
/*
|
||||
* 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
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
extern "C" int dl_df_1_global_get_answer_impl() {
|
||||
return 42;
|
||||
}
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
/*
|
||||
* 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
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
extern "C" int __attribute__((weak)) dl_df_1_global_get_answer_impl() {
|
||||
return 0;
|
||||
}
|
||||
|
||||
extern "C" int dl_df_1_global_get_answer() {
|
||||
return dl_df_1_global_get_answer_impl();
|
||||
}
|
||||
|
|
@ -0,0 +1,45 @@
|
|||
/*
|
||||
* 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
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
// This one should be preempted by the function
|
||||
// defined in the main executable.
|
||||
extern "C" int __attribute__((weak)) main_global_default_serial() {
|
||||
return 2716057;
|
||||
}
|
||||
|
||||
// Even though this one is defined by the main
|
||||
// executable it should not be preempted
|
||||
// because of protected visibility
|
||||
extern "C" int __attribute__((weak, visibility("protected"))) main_global_protected_serial() {
|
||||
return 3370318;
|
||||
}
|
||||
|
||||
extern "C" int main_global_default_get_serial() {
|
||||
return main_global_default_serial();
|
||||
}
|
||||
|
||||
extern "C" int main_global_protected_get_serial() {
|
||||
return main_global_protected_serial();
|
||||
}
|
||||
|
||||
// Trying to preempt functions from a DT_NEEDED .so
|
||||
extern "C" int lib_global_default_serial() {
|
||||
return 3370318;
|
||||
}
|
||||
|
||||
extern "C" int lib_global_protected_serial() {
|
||||
return 2716057;
|
||||
}
|
||||
|
|
@ -0,0 +1,37 @@
|
|||
/*
|
||||
* 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
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
// This one should be preempted by the function
|
||||
// defined in libdl_preempt_test_1.so
|
||||
extern "C" int __attribute__((weak)) lib_global_default_serial() {
|
||||
return 2716057;
|
||||
}
|
||||
|
||||
// Even though this one is defined by
|
||||
// libdl_preempt_test_1.so it should not be
|
||||
// preempted because of protected visibility
|
||||
extern "C" int __attribute__((weak,visibility("protected"))) lib_global_protected_serial() {
|
||||
return 3370318;
|
||||
}
|
||||
|
||||
extern "C" int lib_global_default_get_serial() {
|
||||
return lib_global_default_serial();
|
||||
}
|
||||
|
||||
extern "C" int lib_global_protected_get_serial() {
|
||||
return lib_global_protected_serial();
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue