From c2296c13d2e32be92c8b62b07d213f072c4a19e7 Mon Sep 17 00:00:00 2001
From: ClawSeven <zehuan97@gmail.com>
Date: Mon, 29 Jan 2024 15:38:58 +0800
Subject: [PATCH] [libos] Fix sendfile with non-writable file

---
 src/libos/src/fs/file_ops/sendfile.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/libos/src/fs/file_ops/sendfile.rs b/src/libos/src/fs/file_ops/sendfile.rs
index 3f261aec..90cc7d73 100644
--- a/src/libos/src/fs/file_ops/sendfile.rs
+++ b/src/libos/src/fs/file_ops/sendfile.rs
@@ -15,6 +15,17 @@ pub fn do_sendfile(
     let current = current!();
     let in_file = current.file(in_fd)?;
     let out_file = current.file(out_fd)?;
+
+    let in_file_access = in_file.access_mode()?;
+    if !in_file_access.readable() {
+        return_errno!(EBADF, "The in file is non-readable");
+    }
+
+    let out_file_access = out_file.access_mode()?;
+    if !out_file_access.writable() {
+        return_errno!(EBADF, "The out file is non-writable");
+    }
+
     let mut buffer: [u8; 1024 * 11] = unsafe { MaybeUninit::uninit().assume_init() };
 
     let mut read_offset = match offset {