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>

5 files changed, 41 insertions, 14 deletions

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 50009c787bcd..9d3044ff45b9 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -205,17 +205,22 @@ static int ping_init_sock(struct sock *sk)
 	gid_t range[2];
 	struct group_info *group_info = get_current_groups();
 	int i, j, count = group_info->ngroups;
+	kgid_t low, high;
 
 	inet_get_ping_group_range_net(net, range, range+1);
+	low = make_kgid(&init_user_ns, range[0]);
+	high = make_kgid(&init_user_ns, range[1]);
+	if (!gid_valid(low) || !gid_valid(high) || gid_lt(high, low))
+		return -EACCES;
+
 	if (range[0] <= group && group <= range[1])
 		return 0;
 
 	for (i = 0; i < group_info->nblocks; i++) {
 		int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
-
 		for (j = 0; j < cp_count; j++) {
-			group = group_info->blocks[i][j];
-			if (range[0] <= group && group <= range[1])
+			kgid_t gid = group_info->blocks[i][j];
+			if (gid_lte(low, gid) && gid_lte(gid, high))
 				return 0;
 		}
 
diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c
index 75762f346975..6ed6f201b022 100644
--- a/net/sunrpc/auth_generic.c
+++ b/net/sunrpc/auth_generic.c
@@ -160,8 +160,8 @@ generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
 	if (gcred->acred.group_info->ngroups != acred->group_info->ngroups)
 		goto out_nomatch;
 	for (i = 0; i < gcred->acred.group_info->ngroups; i++) {
-		if (GROUP_AT(gcred->acred.group_info, i) !=
-				GROUP_AT(acred->group_info, i))
+		if (!gid_eq(GROUP_AT(gcred->acred.group_info, i),
+				GROUP_AT(acred->group_info, i)))
 			goto out_nomatch;
 	}
 out_match:
diff --git a/net/sunrpc/auth_gss/svcauth_gss.c b/net/sunrpc/auth_gss/svcauth_gss.c
index 1600cfb1618c..28b62dbb6d1e 100644
--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -41,6 +41,7 @@
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/pagemap.h>
+#include <linux/user_namespace.h>
 
 #include <linux/sunrpc/auth_gss.h>
 #include <linux/sunrpc/gss_err.h>
@@ -470,9 +471,13 @@ static int rsc_parse(struct cache_detail *cd,
 		status = -EINVAL;
 		for (i=0; i<N; i++) {
 			gid_t gid;
+			kgid_t kgid;
 			if (get_int(&mesg, &gid))
 				goto out;
-			GROUP_AT(rsci.cred.cr_group_info, i) = gid;
+			kgid = make_kgid(&init_user_ns, gid);
+			if (!gid_valid(kgid))
+				goto out;
+			GROUP_AT(rsci.cred.cr_group_info, i) = kgid;
 		}
 
 		/* mech name */
diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
index e50502d8ceb7..52c5abdee211 100644
--- a/net/sunrpc/auth_unix.c
+++ b/net/sunrpc/auth_unix.c
@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/sunrpc/auth.h>
+#include <linux/user_namespace.h>
 
 #define NFS_NGROUPS	16
 
@@ -78,8 +79,11 @@ unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags)
 		groups = NFS_NGROUPS;
 
 	cred->uc_gid = acred->gid;
-	for (i = 0; i < groups; i++)
-		cred->uc_gids[i] = GROUP_AT(acred->group_info, i);
+	for (i = 0; i < groups; i++) {
+		gid_t gid;
+		gid = from_kgid(&init_user_ns, GROUP_AT(acred->group_info, i));
+		cred->uc_gids[i] = gid;
+	}
 	if (i < NFS_NGROUPS)
 		cred->uc_gids[i] = NOGROUP;
 
@@ -126,9 +130,12 @@ unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags)
 		groups = acred->group_info->ngroups;
 	if (groups > NFS_NGROUPS)
 		groups = NFS_NGROUPS;
-	for (i = 0; i < groups ; i++)
-		if (cred->uc_gids[i] != GROUP_AT(acred->group_info, i))
+	for (i = 0; i < groups ; i++) {
+		gid_t gid;
+		gid = from_kgid(&init_user_ns, GROUP_AT(acred->group_info, i));
+		if (cred->uc_gids[i] != gid)
 			return 0;
+	}
 	if (groups < NFS_NGROUPS &&
 	    cred->uc_gids[groups] != NOGROUP)
 		return 0;
diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
index 521d8f7dc833..71ec8530ec8c 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 @@ static int unix_gid_parse(struct cache_detail *cd,
 
 	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 @@ static int unix_gid_show(struct seq_file *m,
 			 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 @@ static int unix_gid_show(struct seq_file *m,
 
 	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 @@ svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
 	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;