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authorJ. Bruce Fields <bfields@redhat.com>2013-09-13 11:08:45 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-29 11:28:04 -0800
commit35775137cf15c3c03ce7b3e0ff2b19749a2fb0b5 (patch)
treec04069bd97011d35cbff44b3bab3d8d08beb6b53
parentaf1fe0fe8b5706d69d211224a934cf72964eb1f8 (diff)
nfsd: return better errors to exportfs
commit 427d6c6646d868fbd3094e7e2e1644d480cd9204 upstream. Someone noticed exportfs happily accepted exports that would later be rejected when mountd tried to give them to the kernel. Fix this. This is a regression from 4c1e1b34d5c800ad3ac9a7e2805b0bea70ad2278 "nfsd: Store ex_anon_uid and ex_anon_gid as kuids and kgids". Cc: "Eric W. Biederman" <ebiederm@xmission.com> Reported-by: Yin.JianHong <jiyin@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/nfsd/export.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 5f38ea36e266..af51cf9bf2e3 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -536,16 +536,12 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
if (err)
goto out3;
exp.ex_anon_uid= make_kuid(&init_user_ns, an_int);
- if (!uid_valid(exp.ex_anon_uid))
- goto out3;
/* anon gid */
err = get_int(&mesg, &an_int);
if (err)
goto out3;
exp.ex_anon_gid= make_kgid(&init_user_ns, an_int);
- if (!gid_valid(exp.ex_anon_gid))
- goto out3;
/* fsid */
err = get_int(&mesg, &an_int);
@@ -583,6 +579,17 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
exp.ex_uuid);
if (err)
goto out4;
+ /*
+ * For some reason exportfs has been passing down an
+ * invalid (-1) uid & gid on the "dummy" export which it
+ * uses to test export support. To make sure exportfs
+ * sees errors from check_export we therefore need to
+ * delay these checks till after check_export:
+ */
+ if (!uid_valid(exp.ex_anon_uid))
+ goto out4;
+ if (!gid_valid(exp.ex_anon_gid))
+ goto out4;
}
expp = svc_export_lookup(&exp);