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Improved dlsym tests and fixes to linker

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Answers the question: what if dependent library
 was preloaded with RTLD_LOCAL flag.

 Also add test for RTLD_NEXT within local_group.

Bug: http://b/17512583
Change-Id: I79e081e68b3a8c0ed8980d4275a06515fea94ec9
This commit is contained in:
Dmitriy Ivanov
2015-05-12 11:12:27 -07:00
parent 75f2dfca65
commit 697bd9fd38
6 changed files with 170 additions and 48 deletions
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47
linker/linker.cpp
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@@ -918,13 +918,17 @@ static bool walk_dependencies_tree(soinfo* root_soinfos[], size_t root_soinfos_s
}
// This is used by dlsym(3). It performs symbol lookup only within the
// specified soinfo object and its dependencies in breadth first order.
const ElfW(Sym)* dlsym_handle_lookup(soinfo* si, soinfo** found, const char* name) {
static const ElfW(Sym)* dlsym_handle_lookup(soinfo* root, soinfo* skip_until,
soinfo** found, SymbolName& symbol_name) {
const ElfW(Sym)* result = nullptr;
SymbolName symbol_name(name);
bool skip_lookup = skip_until != nullptr;
walk_dependencies_tree(&root, 1, [&](soinfo* current_soinfo) {
if (skip_lookup) {
skip_lookup = current_soinfo != skip_until;
return true;
}
walk_dependencies_tree(&si, 1, [&](soinfo* current_soinfo) {
if (!current_soinfo->find_symbol_by_name(symbol_name, nullptr, &result)) {
result = nullptr;
return false;
@@ -941,6 +945,13 @@ const ElfW(Sym)* dlsym_handle_lookup(soinfo* si, soinfo** found, const char* nam
return result;
}
// This is used by dlsym(3). It performs symbol lookup only within the
// specified soinfo object and its dependencies in breadth first order.
const ElfW(Sym)* dlsym_handle_lookup(soinfo* si, soinfo** found, const char* name) {
SymbolName symbol_name(name);
return dlsym_handle_lookup(si, nullptr, found, symbol_name);
}
/* This is used by dlsym(3) to performs a global symbol lookup. If the
start value is null (for RTLD_DEFAULT), the search starts at the
beginning of the global solist. Otherwise the search starts at the
@@ -978,31 +989,13 @@ const ElfW(Sym)* dlsym_linear_lookup(const char* name,
}
}
// If not found - look into local_group unless
// caller is part of the global group in which
// If not found - use dlsym_handle_lookup for caller's
// local_group unless it is part of the global group in which
// case we already did it.
if (s == nullptr && caller != nullptr &&
(caller->get_rtld_flags() & RTLD_GLOBAL) == 0) {
soinfo* local_group_root = caller->get_local_group_root();
if (handle == RTLD_DEFAULT) {
start = local_group_root;
}
for (soinfo* si = start; si != nullptr; si = si->next) {
if (si->get_local_group_root() != local_group_root) {
break;
}
if (!si->find_symbol_by_name(symbol_name, nullptr, &s)) {
return nullptr;
}
if (s != nullptr) {
*found = si;
break;
}
}
return dlsym_handle_lookup(caller->get_local_group_root(),
(handle == RTLD_NEXT) ? caller : nullptr, found, symbol_name);
}
if (s != nullptr) {