diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2019-08-16 18:58:14 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2019-08-26 13:54:37 -0700 |
| commit | 6501298adb79ad19f8b169add36d7a20e77d305e (patch) | |
| tree | 5f5f7cd3826d92672196675a3a519599fbf85247 /mm/filemap.c | |
| parent | 0c5f629377eba5a533c4802f8a281bee2a7539cb (diff) | |
vfs: don't allow writes to swap filesimmutable-swapfiles_2019-08-26
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>
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; |