| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 035/111] nfs: we dont support removing system.nfs4_acl | Date | Mon, 29 Mar 2021 09:57:43 +0200 |
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From: J. Bruce Fields <bfields@redhat.com>
[ Upstream commit 4f8be1f53bf615102d103c0509ffa9596f65b718 ]
The NFSv4 protocol doesn't have any notion of reomoving an attribute, so removexattr(path,"system.nfs4_acl") doesn't make sense.
There's no documented return value. Arguably it could be EOPNOTSUPP but I'm a little worried an application might take that to mean that we don't support ACLs or xattrs. How about EINVAL?
Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/nfs/nfs4proc.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index b2119159dead..304ab4cdaa8c 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -5754,6 +5754,9 @@ static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t bufl unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE); int ret, i; + /* You can't remove system.nfs4_acl: */ + if (buflen == 0) + return -EINVAL; if (!nfs4_server_supports_acls(server)) return -EOPNOTSUPP; if (npages > ARRAY_SIZE(pages)) -- 2.30.1
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