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| author |  Darrick J. Wong <darrick.wong@oracle.com>
| 2019-08-20 07:55:16 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com>
| 2019-08-20 07:55:16 -0700 |
| commit | dc617f29dbe5ef0c8ced65ce62c464af1daaab3d (patch) | |
| tree | 3596eb0d334f04f87088c735748bba8e66a71cad /mm/filemap.c | |
| parent | mm: set S_SWAPFILE on blockdev swap devices (diff) | |
| download | linux-dc617f29dbe5ef0c8ced65ce62c464af1daaab3d.tar.gz linux-dc617f29dbe5ef0c8ced65ce62c464af1daaab3d.tar.bz2 linux-dc617f29dbe5ef0c8ced65ce62c464af1daaab3d.zip | |
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 <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index d0cf700bf201..40667c2f3383 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2988,6 +2988,9 @@ inline ssize_t generic_write_checks(struct kiocb *iocb, struct iov_iter *from) loff_t count; int ret; + if (IS_SWAPFILE(inode)) + return -ETXTBSY; + if (!iov_iter_count(from)) return 0; |