ovl: fix missing upper fs freeze protection on copy up for ioctl
Generalize the helper ovl_open_maybe_copy_up() and use it to copy up file
with data before FS_IOC_SETFLAGS ioctl.
The FS_IOC_SETFLAGS ioctl is a bit of an odd ball in vfs, which probably
caused the confusion. File may be open O_RDONLY, but ioctl modifies the
file. VFS does not call mnt_want_write_file() nor lock inode mutex, but
fs-specific code for FS_IOC_SETFLAGS does. So ovl_ioctl() calls
mnt_want_write_file() for the overlay file, and fs-specific code calls
mnt_want_write_file() for upper fs file, but there was no call for
ovl_want_write() for copy up duration which prevents overlayfs from copying
up on a frozen upper fs.
Fixes: dab5ca8fd9dd ("ovl: add lsattr/chattr support")
Cc: <stable@vger.kernel.org> # v4.19
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 84dd957..50e4407 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -116,11 +116,10 @@ static int ovl_real_fdget(const struct file *file, struct fd *real)
static int ovl_open(struct inode *inode, struct file *file)
{
- struct dentry *dentry = file_dentry(file);
struct file *realfile;
int err;
- err = ovl_open_maybe_copy_up(dentry, file->f_flags);
+ err = ovl_maybe_copy_up(file_dentry(file), file->f_flags);
if (err)
return err;
@@ -390,7 +389,7 @@ static long ovl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (ret)
return ret;
- ret = ovl_copy_up_with_data(file_dentry(file));
+ ret = ovl_maybe_copy_up(file_dentry(file), O_WRONLY);
if (!ret) {
ret = ovl_real_ioctl(file, cmd, arg);