From b2fb740d99c78a44864f5d03849c8666b225c9bd Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Sat, 5 Nov 2022 12:09:01 +0100
Subject: [PATCH] Kernel: Refuse to mkdir any directory named . or ..

---
 kernel/src/fs/VFS.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/kernel/src/fs/VFS.cpp b/kernel/src/fs/VFS.cpp
index ef0deae2..0c00e7db 100644
--- a/kernel/src/fs/VFS.cpp
+++ b/kernel/src/fs/VFS.cpp
@@ -152,6 +152,11 @@ int VFS::mkdir(const char* path, const char* name)
         kwarnln("Chosen node does not support finddir()");
         return -ENOTSUP;
     }
+    if (!strncmp(name, ".", strlen(name)) || !strncmp(name, "..", strlen(name)))
+    {
+        kwarnln("Attempted to mkdir . or .., which already exist");
+        return -EEXIST;
+    }
     if (node->find_func(node, name) != nullptr)
     {
         kwarnln("Already exists");
@@ -183,6 +188,11 @@ int VFS::do_mkdir(const char* path, const char* name, int uid, int gid, mode_t m
         kwarnln("Chosen node does not support finddir()");
         return -ENOTSUP;
     }
+    if (!strncmp(name, ".", strlen(name)) || !strncmp(name, "..", strlen(name)))
+    {
+        kwarnln("Attempted to mkdir . or .., which already exist");
+        return -EEXIST;
+    }
     if (node->find_func(node, name) != nullptr)
     {
         kwarnln("Already exists");