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Use LD_PRELOAD to intercept sepolicy on 2SI init

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topjohnwu
2022-04-08 02:13:31 -07:00
parent f24d52436b
commit ff2513e276
7 changed files with 96 additions and 53 deletions
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24
native/jni/init/init.cpp
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@@ -8,6 +8,18 @@
#include <utils.hpp>
#include <binaries.h>
#if defined(__arm__)
#include <armeabi-v7a_binaries.h>
#elif defined(__aarch64__)
#include <arm64-v8a_binaries.h>
#elif defined(__i386__)
#include <x86_binaries.h>
#elif defined(__x86_64__)
#include <x86_64_binaries.h>
#else
#error Unsupported ABI
#endif
#include "init.hpp"
using namespace std;
@@ -35,16 +47,24 @@ bool unxz(int fd, const uint8_t *buf, size_t size) {
return true;
}
int dump_manager(const char *path, mode_t mode) {
static int dump_bin(const uint8_t *buf, size_t sz, const char *path, mode_t mode) {
int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC, mode);
if (fd < 0)
return 1;
if (!unxz(fd, manager_xz, sizeof(manager_xz)))
if (!unxz(fd, buf, sz))
return 1;
close(fd);
return 0;
}
int dump_manager(const char *path, mode_t mode) {
return dump_bin(manager_xz, sizeof(manager_xz), path, mode);
}
int dump_preload(const char *path, mode_t mode) {
return dump_bin(preload_xz, sizeof(preload_xz), path, mode);
}
class RecoveryInit : public BaseInit {
public:
using BaseInit::BaseInit;