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Update linker configuration when loading apex

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On ctl.apex_load <apex_name> control message, init invokes linkerconfig
to update linker configuration for the updated apex.

Bug: 232173613
Test: CtsInitTestCases
Test: VendorApexHostTestCases
Change-Id: I01d975849c3f4efe74205a7b04ebbd6864ba1121
This commit is contained in:
Jooyung Han 2022-07-12 14:29:16 +09:00
parent 46fa45d82c
commit 626be07153
1 changed files with 25 additions and 0 deletions
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25
init/init.cpp
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@ -54,6 +54,7 @@
#include <libavb/libavb.h>
#include <libgsi/libgsi.h>
#include <libsnapshot/snapshot.h>
#include <logwrap/logwrap.h>
#include <processgroup/processgroup.h>
#include <processgroup/setup.h>
#include <selinux/android.h>
@ -450,9 +451,33 @@ static Result<void> DoUnloadApex(const std::string& apex_name) {
return {};
}
static Result<void> UpdateApexLinkerConfig(const std::string& apex_name) {
// Do not invoke linkerconfig when there's no bin/ in the apex.
const std::string bin_path = "/apex/" + apex_name + "/bin";
if (access(bin_path.c_str(), R_OK) != 0) {
return {};
}
const char* linkerconfig_binary = "/apex/com.android.runtime/bin/linkerconfig";
const char* linkerconfig_target = "/linkerconfig";
const char* arguments[] = {linkerconfig_binary, "--target", linkerconfig_target, "--apex",
apex_name.c_str(), "--strict"};
if (logwrap_fork_execvp(arraysize(arguments), arguments, nullptr, false, LOG_KLOG, false,
nullptr) != 0) {
return ErrnoError() << "failed to execute linkerconfig";
}
LOG(INFO) << "Generated linker configuration for " << apex_name;
return {};
}
static Result<void> DoLoadApex(const std::string& apex_name) {
std::string prop_name = "init.apex." + apex_name;
// TODO(b/232799709) read .rc files from the apex
if (auto result = UpdateApexLinkerConfig(apex_name); !result.ok()) {
return result.error();
}
SetProperty(prop_name, "loaded");
return {};
}