This is a note to let you know that I've just added the patch titled
fuse: ioctl: translate ENOSYS
to the 5.19-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:
fuse-ioctl-translate-enosys.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 02c0cab8e7345b06f1c0838df444e2902e4138d3 Mon Sep 17 00:00:00 2001
From: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Date: Thu, 21 Jul 2022 16:06:18 +0200
Subject: fuse: ioctl: translate ENOSYS
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
From: Miklos Szeredi <mszeredi@xxxxxxxxxx>
commit 02c0cab8e7345b06f1c0838df444e2902e4138d3 upstream.
Overlayfs may fail to complete updates when a filesystem lacks
fileattr/xattr syscall support and responds with an ENOSYS error code,
resulting in an unexpected "Function not implemented" error.
This bug may occur with FUSE filesystems, such as davfs2.
Steps to reproduce:
# install davfs2, e.g., apk add davfs2
mkdir /test mkdir /test/lower /test/upper /test/work /test/mnt
yes '' | mount -t davfs -o ro http://some-web-dav-server/path \
/test/lower
mount -t overlay -o upperdir=/test/upper,lowerdir=/test/lower \
-o workdir=/test/work overlay /test/mnt
# when "some-file" exists in the lowerdir, this fails with "Function
# not implemented", with dmesg showing "overlayfs: failed to retrieve
# lower fileattr (/some-file, err=-38)"
touch /test/mnt/some-file
The underlying cause of this regresion is actually in FUSE, which fails to
translate the ENOSYS error code returned by userspace filesystem (which
means that the ioctl operation is not supported) to ENOTTY.
Reported-by: Christian Kohlschütter <christian@xxxxxxxxxxxxxxxx>
Fixes: 72db82115d2b ("ovl: copy up sync/noatime fileattr flags")
Fixes: 59efec7b9039 ("fuse: implement ioctl support")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/fuse/ioctl.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
--- a/fs/fuse/ioctl.c
+++ b/fs/fuse/ioctl.c
@@ -9,6 +9,17 @@
#include <linux/compat.h>
#include <linux/fileattr.h>
+static ssize_t fuse_send_ioctl(struct fuse_mount *fm, struct fuse_args *args)
+{
+ ssize_t ret = fuse_simple_request(fm, args);
+
+ /* Translate ENOSYS, which shouldn't be returned from fs */
+ if (ret == -ENOSYS)
+ ret = -ENOTTY;
+
+ return ret;
+}
+
/*
* CUSE servers compiled on 32bit broke on 64bit kernels because the
* ABI was defined to be 'struct iovec' which is different on 32bit
@@ -259,7 +270,7 @@ long fuse_do_ioctl(struct file *file, un
ap.args.out_pages = true;
ap.args.out_argvar = true;
- transferred = fuse_simple_request(fm, &ap.args);
+ transferred = fuse_send_ioctl(fm, &ap.args);
err = transferred;
if (transferred < 0)
goto out;
@@ -393,7 +404,7 @@ static int fuse_priv_ioctl(struct inode
args.out_args[1].size = inarg.out_size;
args.out_args[1].value = ptr;
- err = fuse_simple_request(fm, &args);
+ err = fuse_send_ioctl(fm, &args);
if (!err) {
if (outarg.result < 0)
err = outarg.result;
Patches currently in stable-queue which might be from mszeredi@xxxxxxxxxx are
queue-5.19/fuse-write-inode-in-fuse_release.patch
queue-5.19/ovl-drop-warn_on-dentry-is-null-in-ovl_encode_fh.patch
queue-5.19/fuse-limit-nsec.patch
queue-5.19/fuse-ioctl-translate-enosys.patch
queue-5.19/fuse-fix-deadlock-between-atomic-o_trunc-and-page-invalidation.patch
