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svcrpc: fix failures to handle -1 uid's 

commit 0979292bfa301cb87d936b69af428090d2feea1b upstream.

As of f025adf191 "sunrpc: Properly decode
kuids and kgids in RPC_AUTH_UNIX credentials" any rpc containing a -1
(0xffff) uid or gid would fail with a badcred error.

Commit afe3c3fd53 "svcrpc: fix failures to
handle -1 uid's and gid's" fixed part of the problem, but overlooked the
gid upcall--the kernel can request supplementary gid's for the -1 uid,
but mountd's attempt write a response will get -EINVAL.

Symptoms were nfsd failing to reply to the first attempt to use a newly
negotiated krb5 context.

Reported-by: Sven Geggus <lists@fuchsschwanzdomain.de>
Tested-by: Sven Geggus <lists@fuchsschwanzdomain.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
J. Bruce Fields 2013-07-08 13:44:45 -04:00 committed by Greg Kroah-Hartman
parent 3873153a61
commit c814208bb3
1 changed files with 0 additions and 2 deletions
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2
net/sunrpc/svcauth_unix.c
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@ -493,8 +493,6 @@ static int unix_gid_parse(struct cache_detail *cd,
if (rv)
return -EINVAL;
uid = make_kuid(&init_user_ns, id);
if (!uid_valid(uid))
return -EINVAL;
ug.uid = uid;
expiry = get_expiry(&mesg);