This is a note to let you know that I've just added the patch titled
vfs: deny copy_file_range() for non regular files
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vfs-deny-copy_file_range-for-non-regular-files.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 11cbfb10775aa2a01cee966d118049ede9d0bdf2 Mon Sep 17 00:00:00 2001
From: Amir Goldstein <amir73il@xxxxxxxxx>
Date: Tue, 31 Jan 2017 10:34:56 +0200
Subject: vfs: deny copy_file_range() for non regular files
From: Amir Goldstein <amir73il@xxxxxxxxx>
commit 11cbfb10775aa2a01cee966d118049ede9d0bdf2 upstream.
There is no in-tree file system that implements copy_file_range()
for non regular files.
Deny an attempt to copy_file_range() a directory with EISDIR
and any other non regualr file with EINVAL to conform with
behavior of vfs_{clone,dedup}_file_range().
This change is needed prior to converting sb_start_write()
to file_start_write() in the vfs helper.
Cc: linux-api@xxxxxxxxxxxxxxx
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/read_write.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1518,6 +1518,11 @@ ssize_t vfs_copy_file_range(struct file
if (flags != 0)
return -EINVAL;
+ if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
+ return -EISDIR;
+ if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
+ return -EINVAL;
+
ret = rw_verify_area(READ, file_in, &pos_in, len);
if (unlikely(ret))
return ret;
Patches currently in stable-queue which might be from amir73il@xxxxxxxxx are
queue-4.9/vfs-deny-copy_file_range-for-non-regular-files.patch