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| author | Benjamin Coddington <bcodding@redhat.com> | 2015-06-25 16:25:50 +0300 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-06-26 02:38:00 +0300 |
| commit | 18a600897212c1480eb635112baeab017babfc83 (patch) | |
| tree | 895c037a1c1c0cfd910085d0e112d810cd025322 /fs/nfs | |
| parent | 0c8315dd56577445dd1afe6b9cfa06b7efdf2f82 (diff) | |
| download | linux-18a600897212c1480eb635112baeab017babfc83.tar.xz | |
nfs: verify open flags before allowing open
Commit 9597c13b forbade opens with O_APPEND|O_DIRECT for NFSv4:
nfs: verify open flags before allowing an atomic open
Currently, you can open a NFSv4 file with O_APPEND|O_DIRECT, but cannot
fcntl(F_SETFL,...) with those flags. This flag combination is explicitly
forbidden on NFSv3 opens, and it seems like it should also be on NFSv4.
However, you can still open a file with O_DIRECT|O_APPEND if there exists a
cached dentry for the file because nfs4_file_open() is used instead of
nfs_atomic_open() and the check is bypassed. Add the check in
nfs4_file_open() as well.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs')
| -rw-r--r-- | fs/nfs/nfs4file.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index f58c17b3b480..dcd39d4e2efe 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -41,6 +41,10 @@ nfs4_file_open(struct inode *inode, struct file *filp) dprintk("NFS: open file(%pd2)\n", dentry); + err = nfs_check_flags(openflags); + if (err) + return err; + if ((openflags & O_ACCMODE) == 3) openflags--; |