Commit 5b8ca5a5 authored by Alexander Mikhalitsyn's avatar Alexander Mikhalitsyn Committed by Miklos Szeredi
Browse files

fuse: handle idmappings properly in ->write_iter() 



This is needed to properly clear suid/sgid.

Signed-off-by: default avatarAlexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 4be75ffe

fs/fuse/file.c

+2 −1
Original line number Diff line number Diff line
@@ -1398,6 +1398,7 @@ static void fuse_dio_unlock(struct kiocb *iocb, bool exclusive) 
static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)

{

	struct file *file = iocb->ki_filp;

	struct mnt_idmap *idmap = file_mnt_idmap(file);

	struct address_space *mapping = file->f_mapping;

	ssize_t written = 0;

	struct inode *inode = mapping->host;
@@ -1412,7 +1413,7 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from) 
			return err;



		if (fc->handle_killpriv_v2 &&

		    setattr_should_drop_suidgid(&nop_mnt_idmap,

		    setattr_should_drop_suidgid(idmap,

						file_inode(file))) {

			goto writethrough;

		}