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-rw-r--r--linker/linker.cpp55
-rw-r--r--tests/dl_test.cpp45
-rw-r--r--tests/libs/Android.bp2
-rw-r--r--tests/libs/ld_config_test_helper.cpp9
-rw-r--r--tests/libs/ld_config_test_helper_lib1.cpp21
-rw-r--r--tests/libs/ld_config_test_helper_lib2.cpp12
-rw-r--r--tests/libs/ld_config_test_helper_lib3.cpp24
7 files changed, 125 insertions, 43 deletions
diff --git a/linker/linker.cpp b/linker/linker.cpp
index c240c5639..3488f5cc7 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -1242,7 +1242,7 @@ static bool load_library(android_namespace_t* ns,
return false;
}
- // find and set DT_RUNPATH and dt_soname
+ // Find and set DT_RUNPATH, DT_SONAME, and DT_FLAGS_1.
// Note that these field values are temporary and are
// going to be overwritten on soinfo::prelink_image
// with values from PT_LOAD segments.
@@ -1254,6 +1254,10 @@ static bool load_library(android_namespace_t* ns,
if (d->d_tag == DT_SONAME) {
si->set_soname(elf_reader.get_string(d->d_un.d_val));
}
+ // We need to identify a DF_1_GLOBAL library early so we can link it to namespaces.
+ if (d->d_tag == DT_FLAGS_1) {
+ si->set_dt_flags_1(d->d_un.d_val);
+ }
}
#if !defined(__ANDROID__)
@@ -1552,6 +1556,7 @@ bool find_libraries(android_namespace_t* ns,
});
ZipArchiveCache zip_archive_cache;
+ soinfo_list_t new_global_group_members;
// Step 1: expand the list of load_tasks to include
// all DT_NEEDED libraries (do not load them just yet)
@@ -1586,13 +1591,31 @@ bool find_libraries(android_namespace_t* ns,
// When ld_preloads is not null, the first
// ld_preloads_count libs are in fact ld_preloads.
+ bool is_ld_preload = false;
if (ld_preloads != nullptr && soinfos_count < ld_preloads_count) {
ld_preloads->push_back(si);
+ is_ld_preload = true;
}
if (soinfos_count < library_names_count) {
soinfos[soinfos_count++] = si;
}
+
+ // Add the new global group members to all initial namespaces. Do this secondary namespace setup
+ // at the same time that libraries are added to their primary namespace so that the order of
+ // global group members is the same in the every namespace. Only add a library to a namespace
+ // once, even if it appears multiple times in the dependency graph.
+ if (is_ld_preload || (si->get_dt_flags_1() & DF_1_GLOBAL) != 0) {
+ if (!si->is_linked() && namespaces != nullptr && !new_global_group_members.contains(si)) {
+ new_global_group_members.push_back(si);
+ for (auto linked_ns : *namespaces) {
+ if (si->get_primary_namespace() != linked_ns) {
+ linked_ns->add_soinfo(si);
+ si->add_secondary_namespace(linked_ns);
+ }
+ }
+ }
+ }
}
// Step 2: Load libraries in random order (see b/24047022)
@@ -1649,39 +1672,15 @@ bool find_libraries(android_namespace_t* ns,
register_soinfo_tls(si);
}
- // Step 4: Construct the global group. Note: DF_1_GLOBAL bit of a library is
- // determined at step 3.
-
- // Step 4-1: DF_1_GLOBAL bit is force set for LD_PRELOADed libs because they
- // must be added to the global group
+ // Step 4: Construct the global group. DF_1_GLOBAL bit is force set for LD_PRELOADed libs because
+ // they must be added to the global group. Note: The DF_1_GLOBAL bit for a library is normally set
+ // in step 3.
if (ld_preloads != nullptr) {
for (auto&& si : *ld_preloads) {
si->set_dt_flags_1(si->get_dt_flags_1() | DF_1_GLOBAL);
}
}
- // Step 4-2: Gather all DF_1_GLOBAL libs which were newly loaded during this
- // run. These will be the new member of the global group
- soinfo_list_t new_global_group_members;
- for (auto&& task : load_tasks) {
- soinfo* si = task->get_soinfo();
- if (!si->is_linked() && (si->get_dt_flags_1() & DF_1_GLOBAL) != 0) {
- new_global_group_members.push_back(si);
- }
- }
-
- // Step 4-3: Add the new global group members to all the linked namespaces
- if (namespaces != nullptr) {
- for (auto linked_ns : *namespaces) {
- for (auto si : new_global_group_members) {
- if (si->get_primary_namespace() != linked_ns) {
- linked_ns->add_soinfo(si);
- si->add_secondary_namespace(linked_ns);
- }
- }
- }
- }
-
// Step 5: Collect roots of local_groups.
// Whenever needed_by->si link crosses a namespace boundary it forms its own local_group.
// Here we collect new roots to link them separately later on. Note that we need to avoid
diff --git a/tests/dl_test.cpp b/tests/dl_test.cpp
index 6adba1906..6c9bf3fb5 100644
--- a/tests/dl_test.cpp
+++ b/tests/dl_test.cpp
@@ -268,8 +268,16 @@ static bool is_debuggable_build() {
}
#endif
-// _lib1.so and _lib2.so are now searchable by having another namespace 'ns2'
+// lib1.so and lib2.so are now searchable by having another namespace 'ns2'
// whose search paths include the 'ns2/' subdir.
+//
+// lib1.so is linked with DF_1_GLOBAL, so both it and the executable are added
+// to every namespace.
+//
+// namespace configuration ('*' indicates primary ns)
+// - default: exe[*], lib1.so
+// - ns2: exe, lib1.so[*], lib2.so[*]
+//
TEST(dl, exec_with_ld_config_file) {
#if defined(__BIONIC__)
SKIP_WITH_HWASAN << "libclang_rt.hwasan is not found with custom ld config";
@@ -285,13 +293,28 @@ TEST(dl, exec_with_ld_config_file) {
ExecTestHelper eth;
eth.SetArgs({ helper.c_str(), nullptr });
eth.SetEnv({ env.c_str(), nullptr });
- eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0, "12345");
+ eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0,
+ "foo lib1\n"
+ "lib1_call_funcs\n"
+ "foo lib1\n"
+ "bar lib2\n");
#endif
}
-// _lib3.so has same symbol as lib2.so but returns 54321. _lib3.so is
-// LD_PRELOADed. This test is to ensure LD_PRELOADed libs are available to
-// additional namespaces other than the default namespace.
+// lib3.so has same foo and bar symbols as lib2.so. lib3.so is LD_PRELOADed.
+// This test ensures that LD_PRELOADed libs are available to all namespaces.
+//
+// namespace configuration ('*' indicates primary ns)
+// - default: exe[*], lib3.so[*], lib1.so
+// - ns2: exe, lib3.so, lib1.so[*], lib2.so[*]
+//
+// Ensure that, in both namespaces, a call to foo calls the lib3.so symbol,
+// which then calls the lib1.so symbol using RTLD_NEXT. Ensure that RTLD_NEXT
+// finds nothing when called from lib1.so.
+//
+// For the bar symbol, lib3.so's primary namespace is the default namespace, but
+// lib2.so is not in the default namespace, so using RTLD_NEXT from lib3.so
+// doesn't find the symbol in lib2.so.
TEST(dl, exec_with_ld_config_file_with_ld_preload) {
#if defined(__BIONIC__)
SKIP_WITH_HWASAN << "libclang_rt.hwasan is not found with custom ld config";
@@ -308,7 +331,17 @@ TEST(dl, exec_with_ld_config_file_with_ld_preload) {
ExecTestHelper eth;
eth.SetArgs({ helper.c_str(), nullptr });
eth.SetEnv({ env.c_str(), env2.c_str(), nullptr });
- eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0, "54321");
+ eth.Run([&]() { execve(helper.c_str(), eth.GetArgs(), eth.GetEnv()); }, 0,
+ "foo lib3\n"
+ "foo lib1\n"
+ "lib1_call_funcs\n"
+ "foo lib3\n"
+ "foo lib1\n"
+ "bar lib3\n"
+ "lib3_call_funcs\n"
+ "foo lib3\n"
+ "foo lib1\n"
+ "bar lib3\n");
#endif
}
diff --git a/tests/libs/Android.bp b/tests/libs/Android.bp
index 385d1209e..ba1c1989b 100644
--- a/tests/libs/Android.bp
+++ b/tests/libs/Android.bp
@@ -1478,6 +1478,8 @@ cc_test_library {
srcs: ["ld_config_test_helper_lib1.cpp"],
shared_libs: ["ld_config_test_helper_lib2"],
relative_install_path: "bionic-loader-test-libs/ns2",
+ // Mark the library DF_1_GLOBAL so it is added to every linker namespace.
+ ldflags: ["-Wl,-z,global"]
}
cc_test_library {
diff --git a/tests/libs/ld_config_test_helper.cpp b/tests/libs/ld_config_test_helper.cpp
index 87e512eff..124912180 100644
--- a/tests/libs/ld_config_test_helper.cpp
+++ b/tests/libs/ld_config_test_helper.cpp
@@ -22,7 +22,9 @@
#endif
#include <unistd.h>
-extern int get_value_from_lib();
+extern "C" void foo();
+void lib1_call_funcs();
+__attribute__((weak)) void lib3_call_funcs();
int main() {
bool skip_vdso_check = false;
@@ -45,6 +47,9 @@ int main() {
dlclose(handle);
}
- printf("%d", get_value_from_lib());
+ foo();
+ lib1_call_funcs();
+ if (lib3_call_funcs) lib3_call_funcs();
+
return 0;
}
diff --git a/tests/libs/ld_config_test_helper_lib1.cpp b/tests/libs/ld_config_test_helper_lib1.cpp
index fc5401a26..ffa9a457f 100644
--- a/tests/libs/ld_config_test_helper_lib1.cpp
+++ b/tests/libs/ld_config_test_helper_lib1.cpp
@@ -1,4 +1,19 @@
-extern int get_value_from_another_lib();
-int get_value_from_lib() {
- return get_value_from_another_lib();
+#include <dlfcn.h>
+#include <stdio.h>
+
+// Mark foo and bar weak so that Clang allows the run-time linker to decide which DSO's symbol to
+// use.
+
+__attribute__((weak)) extern "C" void foo() {
+ printf("foo lib1\n");
+ void (*next)(void) = reinterpret_cast<void (*)()>(dlsym(RTLD_NEXT, "foo"));
+ if (next != nullptr) next();
+}
+
+__attribute__((weak)) extern "C" void bar();
+
+void lib1_call_funcs() {
+ printf("lib1_call_funcs\n");
+ foo();
+ bar();
}
diff --git a/tests/libs/ld_config_test_helper_lib2.cpp b/tests/libs/ld_config_test_helper_lib2.cpp
index a620a6cf5..d5bca2c36 100644
--- a/tests/libs/ld_config_test_helper_lib2.cpp
+++ b/tests/libs/ld_config_test_helper_lib2.cpp
@@ -1,3 +1,11 @@
-int get_value_from_another_lib() {
- return 12345;
+#include <dlfcn.h>
+#include <stdio.h>
+
+// Mark foo and bar weak so that Clang allows the run-time linker to decide which DSO's symbol to
+// use.
+
+__attribute__((weak)) extern "C" void bar() {
+ printf("bar lib2\n");
+ void (*next)(void) = reinterpret_cast<void (*)()>(dlsym(RTLD_NEXT, "bar"));
+ if (next != nullptr) next();
}
diff --git a/tests/libs/ld_config_test_helper_lib3.cpp b/tests/libs/ld_config_test_helper_lib3.cpp
index 93d1cd81d..94e15704d 100644
--- a/tests/libs/ld_config_test_helper_lib3.cpp
+++ b/tests/libs/ld_config_test_helper_lib3.cpp
@@ -1,3 +1,23 @@
-int get_value_from_another_lib() {
- return 54321;
+#include <dlfcn.h>
+#include <stdio.h>
+
+// Mark foo and bar weak so that Clang allows the run-time linker to decide which DSO's symbol to
+// use.
+
+__attribute__((weak)) extern "C" void foo() {
+ printf("foo lib3\n");
+ void (*next)(void) = reinterpret_cast<void (*)()>(dlsym(RTLD_NEXT, "foo"));
+ if (next != nullptr) next();
+}
+
+__attribute__((weak)) extern "C" void bar() {
+ printf("bar lib3\n");
+ void (*next)(void) = reinterpret_cast<void (*)()>(dlsym(RTLD_NEXT, "bar"));
+ if (next != nullptr) next();
+}
+
+void lib3_call_funcs() {
+ printf("lib3_call_funcs\n");
+ foo();
+ bar();
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-03 13:30:23 +0000