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Improve library lookup logic

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Linker tries to open a library even if it can
be found by soname. This only happens if the
library was previously opened under different
target sdk version.

Bug: http://b/21876587
Bug: http://b/21153477
Bug: http://b/21171302
Bug: https://code.google.com/p/android/issues/detail?id=160921
Change-Id: I769a04b6b1368a107d43f399297be14050338bbc
This commit is contained in:
Dmitriy Ivanov 2015-06-16 15:38:21 -07:00
parent 420574690c
commit ea4ef52fa4
2 changed files with 16 additions and 0 deletions
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12
linker/linker.cpp
View file

@ -1349,7 +1349,19 @@ static soinfo *find_loaded_library_by_soname(const char* name) {
return nullptr;
}
uint32_t target_sdk_version = get_application_target_sdk_version();
for (soinfo* si = solist; si != nullptr; si = si->next) {
// If the library was opened under different target sdk version
// skip this step and try to reopen it. The exceptions are
// "libdl.so" and global group. There is no point in skipping
// them because relocation process is going to use them
// in any case.
if (si != solist && (si->get_dt_flags_1() & DF_1_GLOBAL) == 0 &&
si->is_linked() && si->get_target_sdk_version() != target_sdk_version) {
continue;
}
const char* soname = si->get_soname();
if (soname != nullptr && (strcmp(name, soname) == 0)) {
return si;

4
linker/linker_sdk_versions.cpp
View file

@ -21,6 +21,10 @@
static std::atomic<uint32_t> g_target_sdk_version(__ANDROID_API__);
void set_application_target_sdk_version(uint32_t target) {
// translate current sdk_version to platform sdk_version
if (target == 0) {
target = __ANDROID_API__;
}
g_target_sdk_version = target;
}