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userns: Convert group_info values from gid_t to kgid_t.

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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>
This commit is contained in:
Eric W. Biederman 2011-11-14 15:56:38 -08:00
parent 22d917d80e
commit ae2975bc34
12 changed files with 104 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

15
net/sunrpc/auth_unix.c
View file

@ -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;