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Fix dlsym() to take into account RTLD_GLOBAL/LOCAL

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Symbols from libraries opened with RTLD_LOCAL (default)
  should not be visible via dlsym(RLTD_DEFAULT/RTLD_NEXT, .)

Bug: 17512583
Bug: 18186310

(cherry picked from commit e8ba50fe0d)

Change-Id: Idf6bbe2233fb2bfc0c88677e7d1fc518fb3f7a8b
This commit is contained in:
Dmitriy Ivanov
2014-09-15 17:00:10 -07:00
parent 926797a8a9
commit c85e82dde5
5 changed files with 73 additions and 20 deletions
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36
tests/dlfcn_test.cpp
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@@ -202,6 +202,42 @@ TEST(dlfcn, dlopen_check_order) {
dlclose(handle);
}
TEST(dlfcn, dlopen_check_rtld_local) {
void* sym = dlsym(RTLD_DEFAULT, "dlopen_testlib_simple_func");
ASSERT_TRUE(sym == nullptr);
// implicit RTLD_LOCAL
void* handle = dlopen("libtest_simple.so", RTLD_NOW);
sym = dlsym(RTLD_DEFAULT, "dlopen_testlib_simple_func");
ASSERT_TRUE(sym == nullptr);
ASSERT_SUBSTR("undefined symbol: dlopen_testlib_simple_func", dlerror());
sym = dlsym(handle, "dlopen_testlib_simple_func");
ASSERT_TRUE(sym != nullptr);
ASSERT_TRUE(reinterpret_cast<bool (*)(void)>(sym)());
dlclose(handle);
// explicit RTLD_LOCAL
handle = dlopen("libtest_simple.so", RTLD_NOW | RTLD_LOCAL);
sym = dlsym(RTLD_DEFAULT, "dlopen_testlib_simple_func");
ASSERT_TRUE(sym == nullptr);
ASSERT_SUBSTR("undefined symbol: dlopen_testlib_simple_func", dlerror());
sym = dlsym(handle, "dlopen_testlib_simple_func");
ASSERT_TRUE(sym != nullptr);
ASSERT_TRUE(reinterpret_cast<bool (*)(void)>(sym)());
dlclose(handle);
}
TEST(dlfcn, dlopen_check_rtld_global) {
void* sym = dlsym(RTLD_DEFAULT, "dlopen_testlib_simple_func");
ASSERT_TRUE(sym == nullptr);
void* handle = dlopen("libtest_simple.so", RTLD_NOW | RTLD_GLOBAL);
sym = dlsym(RTLD_DEFAULT, "dlopen_testlib_simple_func");
ASSERT_TRUE(sym != nullptr) << dlerror();
ASSERT_TRUE(reinterpret_cast<bool (*)(void)>(sym)());
dlclose(handle);
}
// libtest_with_dependency_loop.so -> libtest_with_dependency_loop_a.so ->
// libtest_with_dependency_loop_b.so -> libtest_with_dependency_loop_c.so ->
// libtest_with_dependency_loop_a.so