Magisk/native/jni/magiskhide/hide_policy.cpp

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#include <sys/mount.h>
#include <magisk.h>
#include <utils.h>
#include <selinux.h>
#include <resetprop.h>
#include "magiskhide.h"
using namespace std;
static const char *prop_key[] =
{ "ro.boot.vbmeta.device_state", "ro.boot.verifiedbootstate", "ro.boot.flash.locked",
"ro.boot.veritymode", "ro.boot.warranty_bit", "ro.warranty_bit", "ro.debuggable",
"ro.secure", "ro.build.type", "ro.build.tags", "ro.build.selinux", nullptr };
static const char *prop_value[] =
{ "locked", "green", "1",
"enforcing", "0", "0", "0",
"1", "user", "release-keys", "0", nullptr };
void hide_sensitive_props() {
LOGI("hide_policy: Hiding sensitive props\n");
// Hide all sensitive props
for (int i = 0; prop_key[i]; ++i) {
auto value = getprop(prop_key[i]);
if (!value.empty() && value != prop_value[i])
setprop(prop_key[i], prop_value[i], false);
}
}
static inline void lazy_unmount(const char* mountpoint) {
if (umount2(mountpoint, MNT_DETACH) != -1)
LOGD("hide_policy: Unmounted (%s)\n", mountpoint);
}
void hide_daemon(int pid) {
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run_finally fin([=]() -> void {
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// Send resume signal
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kill(pid, SIGCONT);
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_exit(0);
});
hide_unmount(pid);
}
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#define TMPFS_MNT(dir) (mentry->mnt_type == "tmpfs"sv && \
strncmp(mentry->mnt_dir, "/" #dir, sizeof("/" #dir) - 1) == 0)
void hide_unmount(int pid) {
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if (switch_mnt_ns(pid))
return;
LOGD("hide_policy: handling PID=[%d]\n", pid);
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char val;
int fd = xopen(SELINUX_ENFORCE, O_RDONLY);
xxread(fd, &val, sizeof(val));
close(fd);
// Permissive
if (val == '0') {
chmod(SELINUX_ENFORCE, 0640);
chmod(SELINUX_POLICY, 0440);
}
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vector<string> targets;
// Unmount dummy skeletons and /sbin links
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parse_mnt("/proc/self/mounts", [&](mntent *mentry) {
if (TMPFS_MNT(system) || TMPFS_MNT(vendor) || TMPFS_MNT(sbin))
targets.emplace_back(mentry->mnt_dir);
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return true;
});
for (auto &s : targets)
lazy_unmount(s.data());
targets.clear();
// Unmount all Magisk created mounts
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parse_mnt("/proc/self/mounts", [&](mntent *mentry) {
if (strstr(mentry->mnt_fsname, BLOCKDIR))
targets.emplace_back(mentry->mnt_dir);
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return true;
});
for (auto &s : targets)
lazy_unmount(s.data());
}