linker: Allow link namespaces without name filters
This commit allows users to create a link without soname filters between
two linker namespaces.
The motivation is to establish one-way shared library isolation. For
example, assume that there are two linker namespaces `default` and
`vndk`. We would like to limit the shared libraries that can be used by
the `default` namespace. In the meanwhile, we would like to allow the
`vndk` namespace to use shared libs from the `default` namespace if the
soname cannot be find in the search path or loaded sonames of the `vndk`
namespace.
shared_libs = %VNDK_CORE_LIBRARIES%
shared_libs += %VNDK_SAMEPROCESS_LIBRARIES%
vndk <-------------------------------------------- default
\_______________________________________________/^
allow_all_shared_libs = true
android_link_namespaces_all_libs() is added to libdl, but it is
versioned as LIBC_PRIVATE. android_link_namespaces_all_libs() is only
for unit tests.
Bug: 69824336
Test: adb shell /data/nativetest/linker-unit-tests/linker-unit-tests32
Test: adb shell /data/nativetest64/linker-unit-tests/linker-unit-tests64
Test: adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests
Test: adb shell /data/nativetest64/bionic-unit-tests/bionic-unit-tests
Test: Update /system/etc/ld.config*.txt and check whether the vndk
linker namespace of the vendor process can access the shared libs from
the default linker namespace.
Change-Id: I2879f0c5f5af60c7e56f8f743ebd2872e552286b
diff --git a/libdl/libdl.cpp b/libdl/libdl.cpp
index c834088..4c2415f 100644
--- a/libdl/libdl.cpp
+++ b/libdl/libdl.cpp
@@ -93,6 +93,11 @@
const char* shared_libs_sonames);
__attribute__((__weak__, visibility("default")))
+bool __loader_android_link_namespaces_all_libs(
+ struct android_namespace_t* namespace_from,
+ struct android_namespace_t* namespace_to);
+
+__attribute__((__weak__, visibility("default")))
void __loader_android_dlwarning(void* obj, void (*f)(void*, const char*));
__attribute__((__weak__, visibility("default")))
@@ -205,6 +210,12 @@
}
__attribute__((__weak__))
+bool android_link_namespaces_all_libs(struct android_namespace_t* namespace_from,
+ struct android_namespace_t* namespace_to) {
+ return __loader_android_link_namespaces_all_libs(namespace_from, namespace_to);
+}
+
+__attribute__((__weak__))
void android_dlwarning(void* obj, void (*f)(void*, const char*)) {
__loader_android_dlwarning(obj, f);
}