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SUNRPC: Fix the server AUTH_UNIX userspace mappings

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gid_parse() is part of a downcall, so uids and gids should be assumed
encoded using the current user namespace.
svcauth_unix_accept() is, on the other hand, decoding uids and gids from
the wire, so we assume those are encoded to match the user namespace of
the server process.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2019-04-09 12:13:40 -04:00 committed by J. Bruce Fields
parent 40373b125d
commit ccfe51a516
1 changed files with 9 additions and 6 deletions
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15
net/sunrpc/svcauth_unix.c
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@ -500,7 +500,7 @@ static int unix_gid_parse(struct cache_detail *cd,
rv = get_int(&mesg, &id);
if (rv)
return -EINVAL;
uid = make_kuid(&init_user_ns, id);
uid = make_kuid(current_user_ns(), id);
ug.uid = uid;
expiry = get_expiry(&mesg);
@ -522,7 +522,7 @@ static int unix_gid_parse(struct cache_detail *cd,
err = -EINVAL;
if (rv)
goto out;
kgid = make_kgid(&init_user_ns, gid);
kgid = make_kgid(current_user_ns(), gid);
if (!gid_valid(kgid))
goto out;
ug.gi->gid[i] = kgid;
@ -555,7 +555,7 @@ static int unix_gid_show(struct seq_file *m,
struct cache_detail *cd,
struct cache_head *h)
{
struct user_namespace *user_ns = &init_user_ns;
struct user_namespace *user_ns = m->file->f_cred->user_ns;
struct unix_gid *ug;
int i;
int glen;
@ -796,6 +796,7 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
struct kvec *argv = &rqstp->rq_arg.head[0];
struct kvec *resv = &rqstp->rq_res.head[0];
struct svc_cred *cred = &rqstp->rq_cred;
struct user_namespace *userns;
u32 slen, i;
int len = argv->iov_len;
@ -816,8 +817,10 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
* (export-specific) anonymous id by nfsd_setuser.
* Supplementary gid's will be left alone.
*/
cred->cr_uid = make_kuid(&init_user_ns, svc_getnl(argv)); /* uid */
cred->cr_gid = make_kgid(&init_user_ns, svc_getnl(argv)); /* gid */
userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ?
rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns;
cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */
cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */
slen = svc_getnl(argv); /* gids length */
if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0)
goto badcred;
@ -825,7 +828,7 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
if (cred->cr_group_info == NULL)
return SVC_CLOSE;
for (i = 0; i < slen; i++) {
kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
kgid_t kgid = make_kgid(userns, svc_getnl(argv));
cred->cr_group_info->gid[i] = kgid;
}
groups_sort(cred->cr_group_info);