From dc617f29dbe5ef0c8ced65ce62c464af1daaab3d Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Tue, 20 Aug 2019 07:55:16 -0700 Subject: vfs: don't allow writes to swap files Don't let userspace write to an active swap file because the kernel effectively has a long term lease on the storage and things could get seriously corrupted if we let this happen. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/block_dev.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs/block_dev.c') diff --git a/fs/block_dev.c b/fs/block_dev.c index c2a85b587922..d9bab63a9b81 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -1978,6 +1978,9 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from) if (bdev_read_only(I_BDEV(bd_inode))) return -EPERM; + if (IS_SWAPFILE(bd_inode)) + return -ETXTBSY; + if (!iov_iter_count(from)) return 0; -- cgit