userns: Convert group_info values from gid_t to kgid_t.
As a first step to converting struct cred to be all kuid_t and kgid_t
values convert the group values stored in group_info to always be
kgid_t values. Unless user namespaces are used this change should
have no effect.
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 521d8f7..71ec853 100644
--- a/net/sunrpc/svcauth_unix.c
+++ b/net/sunrpc/svcauth_unix.c
@@ -14,6 +14,7 @@
#include <net/sock.h>
#include <net/ipv6.h>
#include <linux/kernel.h>
+#include <linux/user_namespace.h>
#define RPCDBG_FACILITY RPCDBG_AUTH
#include <linux/sunrpc/clnt.h>
@@ -530,11 +531,15 @@
for (i = 0 ; i < gids ; i++) {
int gid;
+ kgid_t kgid;
rv = get_int(&mesg, &gid);
err = -EINVAL;
if (rv)
goto out;
- GROUP_AT(ug.gi, i) = gid;
+ kgid = make_kgid(&init_user_ns, gid);
+ if (!gid_valid(kgid))
+ goto out;
+ GROUP_AT(ug.gi, i) = kgid;
}
ugp = unix_gid_lookup(cd, uid);
@@ -563,6 +568,7 @@
struct cache_detail *cd,
struct cache_head *h)
{
+ struct user_namespace *user_ns = current_user_ns();
struct unix_gid *ug;
int i;
int glen;
@@ -580,7 +586,7 @@
seq_printf(m, "%u %d:", ug->uid, glen);
for (i = 0; i < glen; i++)
- seq_printf(m, " %d", GROUP_AT(ug->gi, i));
+ seq_printf(m, " %d", from_kgid_munged(user_ns, GROUP_AT(ug->gi, i)));
seq_printf(m, "\n");
return 0;
}
@@ -831,8 +837,12 @@
cred->cr_group_info = groups_alloc(slen);
if (cred->cr_group_info == NULL)
return SVC_CLOSE;
- for (i = 0; i < slen; i++)
- GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
+ for (i = 0; i < slen; i++) {
+ kgid_t kgid = make_kgid(&init_user_ns, svc_getnl(argv));
+ if (!gid_valid(kgid))
+ goto badcred;
+ GROUP_AT(cred->cr_group_info, i) = kgid;
+ }
if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
*authp = rpc_autherr_badverf;
return SVC_DENIED;