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