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authorLinus Torvalds <torvalds@linux-foundation.org>2019-09-19 03:35:20 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-19 03:35:20 +0300
commite6bc9de714972cac34daa1dc1567ee48a47a9342 (patch)
treebb688c082764b6ce11d1160f525f535836d3f591 /fs/block_dev.c
parentb6c0d35772468173b5d3a7f6162079611e68a1e8 (diff)
parentdc617f29dbe5ef0c8ced65ce62c464af1daaab3d (diff)
downloadlinux-e6bc9de714972cac34daa1dc1567ee48a47a9342.tar.xz
Merge tag 'vfs-5.4-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull swap access updates from Darrick Wong: "Prohibit writing to active swap files and swap partitions. There's no non-malicious use case for allowing userspace to scribble on storage that the kernel thinks it owns" * tag 'vfs-5.4-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: vfs: don't allow writes to swap files mm: set S_SWAPFILE on blockdev swap devices
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 677cb364d33f..9c073dbdc1b0 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1972,6 +1972,9 @@ 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;