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authorJ. Bruce Fields <bfields@redhat.com>2013-09-13 23:50:42 +0200
committerJ. Bruce Fields <bfields@redhat.com>2013-10-29 22:46:14 +0100
commit6f6cc3205c5f10129b8a10cdf8abf85d9db48a60 (patch)
treec0c388985d7231b2c3b940cbdb64d877dde95c8b /fs
parentnfsd: return better errors to exportfs (diff)
downloadlinux-6f6cc3205c5f10129b8a10cdf8abf85d9db48a60.tar.xz
linux-6f6cc3205c5f10129b8a10cdf8abf85d9db48a60.zip
nfsd: -EINVAL on invalid anonuid/gid instead of silent failure
If we're going to refuse to accept these it would be polite of us to at least say so.... This introduces a slight complication since we need to grandfather in exportfs's ill-advised use of -1 uid and gid on its test_export. If it turns out there are other users passing down -1 we may need to do something else. Best might be to drop the checks entirely, but I'm not sure if other parts of the kernel might assume that a task can't run as uid or gid -1. Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/export.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index af51cf9bf2e3..8513c598fabf 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -580,16 +580,25 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
if (err)
goto out4;
/*
+ * No point caching this if it would immediately expire.
+ * Also, this protects exportfs's dummy export from the
+ * anon_uid/anon_gid checks:
+ */
+ if (exp.h.expiry_time < seconds_since_boot())
+ 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:
*/
+ err = -EINVAL;
if (!uid_valid(exp.ex_anon_uid))
goto out4;
if (!gid_valid(exp.ex_anon_gid))
goto out4;
+ err = 0;
}
expp = svc_export_lookup(&exp);