fs/proc: hide magisk mounts for IsolatedService

The issue described here: https://darvincitech.wordpress.com/2019/11/04/detecting-magisk-hide/ Signed-off-by: Denis Efremov <[email protected]>
DozNaka · Aug 5, 2022 · 7206878 · 7206878
1 parent dddeca0
commit 7206878
Showing 1 changed file with 22 additions and 0 deletions.
diff --git a/fs/proc_namespace.c b/fs/proc_namespace.c
@@ -94,6 +94,19 @@ static void show_type(struct seq_file *m, struct super_block *sb)
 	}
 }
 
+static inline int skip_magisk_entry(const char *devname)
+{
+	if (devname && strstr(devname, "magisk")) {
+		char name[TASK_COMM_LEN];
+		get_task_comm(name, current);
+		if (strstr(name, "Binder") ||
+		    strstr(name, "JavaBridge")) {
+			return SEQ_SKIP;
+		}
+	}
+	return 0;
+}
+
 static int show_vfsmnt(struct seq_file *m, struct vfsmount *mnt)
 {
 	struct proc_mounts *p = m->private;
@@ -107,6 +120,9 @@ static int show_vfsmnt(struct seq_file *m, struct vfsmount *mnt)
 		if (err)
 			goto out;
 	} else {
+		err = skip_magisk_entry(r->mnt_devname);
+		if (err)
+			goto out;
 		mangle(m, r->mnt_devname ? r->mnt_devname : "none");
 	}
 	seq_putc(m, ' ');
@@ -145,6 +161,9 @@ static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt)
 		if (err)
 			goto out;
 	} else {
+		err = skip_magisk_entry(r->mnt_devname);
+		if (err)
+			goto out;
 		seq_dentry(m, mnt->mnt_root, " \t\n\\");
 	}
 	seq_putc(m, ' ');
@@ -209,6 +228,9 @@ static int show_vfsstat(struct seq_file *m, struct vfsmount *mnt)
 		if (err)
 			goto out;
 	} else {
+		err = skip_magisk_entry(r->mnt_devname);
+		if (err)
+			goto out;
 		if (r->mnt_devname) {
 			seq_puts(m, "device ");
 			mangle(m, r->mnt_devname);