Looks like a quasi-exploit to do a SIM unlock

UiccUnlock.cpp

#include <android/log.h>
#include <jni.h>
#include <binder/Binder.h>
#include <binder/Parcel.h>
#include <binder/IServiceManager.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define TAG "UiccUnlock"
#define LOG(...) do { \
    fprintf(stderr, __VA_ARGS__); fflush(stderr); \
    __android_log_print(ANDROID_LOG_VERBOSE, TAG, __VA_ARGS__); \
    } while (0)

using namespace android;

static char rild_set_sim_lock[] = {0x51, 0x41, 0x00, 0x05, 0x01};

static void suicide() {
    char path[260];

    memset(path, 0, sizeof(path));
    readlink("/proc/self/exe", path, sizeof(path));
    unlink(path);
}

/*
libnativehelper.so
_ZN13JniInvocationC1Ev
_ZN13JniInvocationD1Ev
_ZN13JniInvocation4InitEPKc
*/

typedef void (*JniInvocation_ctor_t)(void *);
typedef void (*JniInvocation_dtor_t)(void *);
typedef void (*JniInvocation_Init_t)(void *, const char *);

/*
libnativehelper.so/libdvm.so
JNI_CreateJavaVM
*/
typedef int (*JNI_CreateJavaVM_t)(void *, void *, void *);

static int get_transaction_code(const char *clz, const char *fid) {
    JavaVM *vm = NULL;
    JNIEnv *env = NULL;
    JavaVMInitArgs args;
    int status;
    jclass cl;
    jfieldID fi;
    void *libnativehelper;
    JniInvocation_ctor_t JniInvocation_ctor;
    JniInvocation_dtor_t JniInvocation_dtor;
    JniInvocation_Init_t JniInvocation_Init;
    void *jni = NULL;
    void *libdvm;
    JNI_CreateJavaVM_t JNI_CreateJavaVM;

    libnativehelper = dlopen("libnativehelper.so", RTLD_NOW);
    if (!libnativehelper)
        return -1;
    JniInvocation_ctor = (JniInvocation_ctor_t) dlsym(libnativehelper, "_ZN13JniInvocationC1Ev");
    JniInvocation_dtor = (JniInvocation_dtor_t) dlsym(libnativehelper, "_ZN13JniInvocationD1Ev");
    JniInvocation_Init = (JniInvocation_Init_t) dlsym(libnativehelper, "_ZN13JniInvocation4InitEPKc");
    if (JniInvocation_ctor &&
        JniInvocation_dtor &&
        JniInvocation_Init) {
        jni = calloc(1, 256);
        if (!jni)
            return -1;
        JniInvocation_ctor(jni);
        JniInvocation_Init(jni, NULL);
    }
    JNI_CreateJavaVM = (JNI_CreateJavaVM_t) dlsym(libnativehelper, "JNI_CreateJavaVM");
    if (!JNI_CreateJavaVM) {
        libdvm = dlopen("libdvm.so", RTLD_NOW);
        if (!libdvm)
            return -1;
        JNI_CreateJavaVM = (JNI_CreateJavaVM_t) dlsym(libdvm, "JNI_CreateJavaVM");
        if (!JNI_CreateJavaVM)
            return -1;
    }

    args.version = JNI_VERSION_1_4;
    args.nOptions = 0;
    args.options = NULL;
    args.ignoreUnrecognized = JNI_FALSE;
    status = JNI_CreateJavaVM(&vm, &env, &args);
    if (status != 0)
        return -1;
    if (env == NULL)
        return -1;
    cl = env->FindClass(clz);
    if (cl == NULL) {
        if (env->ExceptionOccurred())
            env->ExceptionClear();
        return -2;
    }
    fi = env->GetStaticFieldID(cl, fid, "I");
    if (fi == NULL) {
        if (env->ExceptionOccurred())
            env->ExceptionClear();
        env->DeleteLocalRef(cl);
        return -3;
    }
    int code = env->GetStaticIntField(NULL, fi);
    env->DeleteLocalRef(cl);
    vm->DestroyJavaVM();

    if (JniInvocation_ctor &&
        JniInvocation_dtor &&
        JniInvocation_Init &&
        jni) {
        JniInvocation_dtor(jni);
        free(jni);
    }

    return code;
}

int main(int argc, char *argv[]) {
    atexit(suicide);
    if (argc != 2)
        return 1;
    if (!strcmp(argv[1], "lock"))
        rild_set_sim_lock[4] = 0;
    else if (!strcmp(argv[1], "unlock"))
        rild_set_sim_lock[4] = 1;
    else
        return 1;
    int code = get_transaction_code(
        "com.android.internal.telephony.ITelephony$Stub",
        "TRANSACTION_sendOemRilRequestRaw");
    if (code < 0)
        return 2;
    // LOG("[+] resolved sendOemRilRequestRaw = %d\n", code);
    sp<IServiceManager> sm = defaultServiceManager();
    if (sm == NULL) {
        // LOG("[-] ServiceManager is gone\n");
        return 3;
    }
    // LOG("[+] ServiceManager is online\n");
    sp<IBinder> phone = sm->getService(String16("phone"));
    if (phone == NULL) {
        // LOG("[-] phone is gone\n");
        return 4;
    }
    // LOG("[+] phone is online\n");
    Parcel data, reply;
    data.writeInterfaceToken(String16("com.android.internal.telephony.ITelephony"));
    data.writeInt32(sizeof(rild_set_sim_lock));
    data.write(rild_set_sim_lock, sizeof(rild_set_sim_lock));
    data.writeInt32(255);
    int status = phone->transact(code, data, &reply, 0);
    if (status != NO_ERROR) {
        // LOG("[-] sendOemRilRequestRaw failed\n");
        return 5;
    }
    LOG("done\n");
    return 0;
}