From 6612a325230b6639ffee3e4519f93ba902886594 Mon Sep 17 00:00:00 2001
From: marecl <fotelpl@gmail.com>
Date: Thu, 20 Nov 2025 18:41:01 +0100
Subject: [PATCH] Prevent writing to directories (#3820)

* Prevent writing to directories

* Prevent writing to directories
---
 src/core/file_sys/directories/base_directory.h | 12 ++++++++++++
 src/core/libraries/kernel/file_system.cpp      | 11 +++++++++++
 2 files changed, 23 insertions(+)

diff --git a/src/core/file_sys/directories/base_directory.h b/src/core/file_sys/directories/base_directory.h
index 8900ac32b..b412865a2 100644
--- a/src/core/file_sys/directories/base_directory.h
+++ b/src/core/file_sys/directories/base_directory.h
@@ -36,6 +36,18 @@ public:
         return ORBIS_KERNEL_ERROR_EBADF;
     }
 
+    virtual s64 write(const void* buf, u64 nbytes) {
+        return ORBIS_KERNEL_ERROR_EBADF;
+    }
+
+    virtual s64 writev(const Libraries::Kernel::OrbisKernelIovec* iov, s32 iovcnt) {
+        return ORBIS_KERNEL_ERROR_EBADF;
+    }
+
+    virtual s64 pwritev(const Libraries::Kernel::OrbisKernelIovec* iov, s32 iovcnt, s64 offset) {
+        return ORBIS_KERNEL_ERROR_EBADF;
+    }
+
     virtual s64 lseek(s64 offset, s32 whence) {
         return ORBIS_KERNEL_ERROR_EBADF;
     }
diff --git a/src/core/libraries/kernel/file_system.cpp b/src/core/libraries/kernel/file_system.cpp
index 7ded1f33e..b4c342f18 100644
--- a/src/core/libraries/kernel/file_system.cpp
+++ b/src/core/libraries/kernel/file_system.cpp
@@ -311,6 +311,9 @@ s64 PS4_SYSV_ABI write(s32 fd, const void* buf, u64 nbytes) {
     } else if (file->type == Core::FileSys::FileType::Socket) {
         // Socket functions handle errnos internally.
         return file->socket->SendPacket(buf, nbytes, 0, nullptr, 0);
+    } else if (file->type == Core::FileSys::FileType::Directory) {
+        *__Error() = POSIX_EBADF;
+        return -1;
     }
 
     return file->f.WriteRaw<u8>(buf, nbytes);
@@ -405,7 +408,11 @@ s64 PS4_SYSV_ABI writev(s32 fd, const OrbisKernelIovec* iov, s32 iovcnt) {
             return -1;
         }
         return result;
+    } else if (file->type == Core::FileSys::FileType::Directory) {
+        *__Error() = POSIX_EBADF;
+        return -1;
     }
+
     s64 total_written = 0;
     for (s32 i = 0; i < iovcnt; i++) {
         total_written += file->f.WriteRaw<u8>(iov[i].iov_base, iov[i].iov_len);
@@ -1047,7 +1054,11 @@ s64 PS4_SYSV_ABI posix_pwritev(s32 fd, const OrbisKernelIovec* iov, s32 iovcnt,
             return -1;
         }
         return result;
+    } else if (file->type == Core::FileSys::FileType::Directory) {
+        *__Error() = POSIX_EBADF;
+        return -1;
     }
+
     const s64 pos = file->f.Tell();
     SCOPE_EXIT {
         file->f.Seek(pos);