From 06e95d0fd74a93858e5f4d0e1d32e92631e649ff Mon Sep 17 00:00:00 2001
From: Liav A <liavalb@gmail.com>
Date: Sat, 11 Sep 2021 12:03:44 +0300
Subject: [PATCH] Kernel/SysFS: Make it possible to have custom permissions for
 nodes

---
 Kernel/FileSystem/SysFS.cpp          | 2 +-
 Kernel/FileSystem/SysFSComponent.cpp | 5 +++++
 Kernel/FileSystem/SysFSComponent.h   | 1 +
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Kernel/FileSystem/SysFS.cpp b/Kernel/FileSystem/SysFS.cpp
index d0447ee4f8..bedf3d6353 100644
--- a/Kernel/FileSystem/SysFS.cpp
+++ b/Kernel/FileSystem/SysFS.cpp
@@ -140,7 +140,7 @@ InodeMetadata SysFSInode::metadata() const
     // NOTE: No locking required as m_associated_component or its component index will never change during our lifetime.
     InodeMetadata metadata;
     metadata.inode = { fsid(), m_associated_component->component_index() };
-    metadata.mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
+    metadata.mode = S_IFREG | m_associated_component->permissions();
     metadata.uid = 0;
     metadata.gid = 0;
     metadata.size = 0;
diff --git a/Kernel/FileSystem/SysFSComponent.cpp b/Kernel/FileSystem/SysFSComponent.cpp
index 1df44166b3..a2cd1db4e6 100644
--- a/Kernel/FileSystem/SysFSComponent.cpp
+++ b/Kernel/FileSystem/SysFSComponent.cpp
@@ -26,6 +26,11 @@ SysFSComponent::SysFSComponent(StringView name)
 {
 }
 
+mode_t SysFSComponent::permissions() const
+{
+    return S_IRUSR | S_IRGRP | S_IROTH;
+}
+
 KResult SysFSDirectory::traverse_as_directory(unsigned fsid, Function<bool(FileSystem::DirectoryEntryView const&)> callback) const
 {
     MutexLocker locker(SysFSComponentRegistry::the().get_lock());
diff --git a/Kernel/FileSystem/SysFSComponent.h b/Kernel/FileSystem/SysFSComponent.h
index 1525014bf7..c6711a3c47 100644
--- a/Kernel/FileSystem/SysFSComponent.h
+++ b/Kernel/FileSystem/SysFSComponent.h
@@ -29,6 +29,7 @@ public:
     virtual KResultOr<size_t> read_bytes(off_t, size_t, UserOrKernelBuffer&, OpenFileDescription*) const { VERIFY_NOT_REACHED(); }
     virtual KResult traverse_as_directory(unsigned, Function<bool(FileSystem::DirectoryEntryView const&)>) const { VERIFY_NOT_REACHED(); }
     virtual RefPtr<SysFSComponent> lookup(StringView) { VERIFY_NOT_REACHED(); };
+    virtual mode_t permissions() const;
     virtual KResultOr<size_t> write_bytes(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) { return EROFS; }
     virtual KResult refresh_data(OpenFileDescription&) const { return KSuccess; }