From 3c34ae11fac3b30629581d0bfaf80f58e82cfbfb Mon Sep 17 00:00:00 2001 From: "J. Bruce Fields" Date: Mon, 4 Mar 2013 08:44:01 -0500 Subject: nfsd: fix krb5 handling of anonymous principals krb5 mounts started failing as of 683428fae8c73d7d7da0fa2e0b6beb4d8df4e808 "sunrpc: Update svcgss xdr handle to rpsec_contect cache". The problem is that mounts are usually done with some host principal which isn't normally mapped to any user, in which case svcgssd passes down uid -1, which the kernel is then expected to map to the export-specific anonymous uid or gid. The new uid_valid/gid_valid checks were therefore causing that downcall to fail. (Note the regression may not have been seen with older userspace that tended to map unknown principals to an anonymous id on their own rather than leaving it to the kernel.) Reviewed-by: "Eric W. Biederman" Signed-off-by: J. Bruce Fields --- net/sunrpc/auth_gss/svcauth_gss.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c index f7d34e7..5ead605 100644 --- a/net/sunrpc/auth_gss/svcauth_gss.c +++ b/net/sunrpc/auth_gss/svcauth_gss.c @@ -447,17 +447,21 @@ static int rsc_parse(struct cache_detail *cd, else { int N, i; + /* + * NOTE: we skip uid_valid()/gid_valid() checks here: + * instead, * -1 id's are later mapped to the + * (export-specific) anonymous id by nfsd_setuser. + * + * (But supplementary gid's get no such special + * treatment so are checked for validity here.) + */ /* uid */ rsci.cred.cr_uid = make_kuid(&init_user_ns, id); - if (!uid_valid(rsci.cred.cr_uid)) - goto out; /* gid */ if (get_int(&mesg, &id)) goto out; rsci.cred.cr_gid = make_kgid(&init_user_ns, id); - if (!gid_valid(rsci.cred.cr_gid)) - goto out; /* number of additional gid's */ if (get_int(&mesg, &N)) -- cgit v1.1