Move denylist code into zygisk

native/jni/zygisk/deny/revert.cpp

@@ -0,0 +1,57 @@
+#include <sys/mount.h>
+
+#include <magisk.hpp>
+#include <utils.hpp>
+#include <selinux.hpp>
+#include <resetprop.hpp>
+
+#include "deny.hpp"
+
+using namespace std;
+
+static void lazy_unmount(const char* mountpoint) {
+    if (umount2(mountpoint, MNT_DETACH) != -1)
+        LOGD("denylist: Unmounted (%s)\n", mountpoint);
+}
+
+void revert_daemon(int pid, int client) {
+    if (fork_dont_care() == 0) {
+        revert_unmount(pid);
+        write_int(client, 0);
+        _exit(0);
+    }
+}
+
+#define TMPFS_MNT(dir) (mentry->mnt_type == "tmpfs"sv && str_starts(mentry->mnt_dir, "/" #dir))
+
+void revert_unmount(int pid) {
+    if (pid > 0) {
+        if (switch_mnt_ns(pid))
+            return;
+        LOGD("denylist: handling PID=[%d]\n", pid);
+    }
+
+    vector<string> targets;
+
+    // Unmount dummy skeletons and MAGISKTMP
+    targets.push_back(MAGISKTMP);
+    parse_mnt("/proc/self/mounts", [&](mntent *mentry) {
+        if (TMPFS_MNT(system) || TMPFS_MNT(vendor) || TMPFS_MNT(product) || TMPFS_MNT(system_ext))
+            targets.emplace_back(mentry->mnt_dir);
+        return true;
+    });
+
+    for (auto &s : reversed(targets))
+        lazy_unmount(s.data());
+    targets.clear();
+
+    // Unmount all Magisk created mounts
+    parse_mnt("/proc/self/mounts", [&](mntent *mentry) {
+        if (str_contains(mentry->mnt_fsname, BLOCKDIR))
+            targets.emplace_back(mentry->mnt_dir);
+        return true;
+    });
+
+    for (auto &s : reversed(targets))
+        lazy_unmount(s.data());
+}