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nfs: Convert idmap to use kuids and kgids
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Convert nfs_map_name_to_uid to return a kuid_t value.
Convert nfs_map_name_to_gid to return a kgid_t value.
Convert nfs_map_uid_to_name to take a kuid_t paramater.
Convert nfs_map_gid_to_name to take a kgid_t paramater.

Tweak nfs_fattr_map_owner_to_name to use a kuid_t intermediate value.
Tweak nfs_fattr_map_group_to_name to use a kgid_t intermediate value.

Which makes these functions properly handle kuids and kgids, including
erroring of the generated kuid or kgid is invalid.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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Eric W. Biederman committed Feb 13, 2013
1 parent 54f834c commit 9f309c8
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Showing 2 changed files with 39 additions and 20 deletions.
50 changes: 34 additions & 16 deletions fs/nfs/idmap.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -97,7 +97,7 @@ static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
{
struct nfs4_string *owner = fattr->owner_name;
__u32 uid;
kuid_t uid;

if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
return false;
Expand All @@ -111,7 +111,7 @@ static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr
static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
{
struct nfs4_string *group = fattr->group_name;
__u32 gid;
kgid_t gid;

if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
return false;
Expand Down Expand Up @@ -837,43 +837,61 @@ idmap_release_pipe(struct inode *inode)
nfs_idmap_abort_pipe_upcall(idmap, -EPIPE);
}

int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, kuid_t *uid)
{
struct idmap *idmap = server->nfs_client->cl_idmap;
__u32 id = -1;
int ret = 0;

if (nfs_map_string_to_numeric(name, namelen, uid))
return 0;
return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap);
if (!nfs_map_string_to_numeric(name, namelen, &id))
ret = nfs_idmap_lookup_id(name, namelen, "uid", &id, idmap);
if (ret == 0) {
*uid = make_kuid(&init_user_ns, id);
if (!uid_valid(*uid))
ret = -ERANGE;
}
return ret;
}

int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid)
int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, kgid_t *gid)
{
struct idmap *idmap = server->nfs_client->cl_idmap;
__u32 id = -1;
int ret = 0;

if (nfs_map_string_to_numeric(name, namelen, gid))
return 0;
return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap);
if (!nfs_map_string_to_numeric(name, namelen, &id))
ret = nfs_idmap_lookup_id(name, namelen, "gid", &id, idmap);
if (ret == 0) {
*gid = make_kgid(&init_user_ns, id);
if (!gid_valid(*gid))
ret = -ERANGE;
}
return ret;
}

int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
int nfs_map_uid_to_name(const struct nfs_server *server, kuid_t uid, char *buf, size_t buflen)
{
struct idmap *idmap = server->nfs_client->cl_idmap;
int ret = -EINVAL;
__u32 id;

id = from_kuid(&init_user_ns, uid);
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap);
ret = nfs_idmap_lookup_name(id, "user", buf, buflen, idmap);
if (ret < 0)
ret = nfs_map_numeric_to_string(uid, buf, buflen);
ret = nfs_map_numeric_to_string(id, buf, buflen);
return ret;
}
int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen)
int nfs_map_gid_to_group(const struct nfs_server *server, kgid_t gid, char *buf, size_t buflen)
{
struct idmap *idmap = server->nfs_client->cl_idmap;
int ret = -EINVAL;
__u32 id;

id = from_kgid(&init_user_ns, gid);
if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap);
ret = nfs_idmap_lookup_name(id, "group", buf, buflen, idmap);
if (ret < 0)
ret = nfs_map_numeric_to_string(gid, buf, buflen);
ret = nfs_map_numeric_to_string(id, buf, buflen);
return ret;
}
9 changes: 5 additions & 4 deletions include/linux/nfs_idmap.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@
#ifndef NFS_IDMAP_H
#define NFS_IDMAP_H

#include <linux/uidgid.h>
#include <uapi/linux/nfs_idmap.h>


Expand Down Expand Up @@ -67,10 +68,10 @@ void nfs_fattr_init_names(struct nfs_fattr *fattr,
void nfs_fattr_free_names(struct nfs_fattr *);
void nfs_fattr_map_and_free_names(struct nfs_server *, struct nfs_fattr *);

int nfs_map_name_to_uid(const struct nfs_server *, const char *, size_t, __u32 *);
int nfs_map_group_to_gid(const struct nfs_server *, const char *, size_t, __u32 *);
int nfs_map_uid_to_name(const struct nfs_server *, __u32, char *, size_t);
int nfs_map_gid_to_group(const struct nfs_server *, __u32, char *, size_t);
int nfs_map_name_to_uid(const struct nfs_server *, const char *, size_t, kuid_t *);
int nfs_map_group_to_gid(const struct nfs_server *, const char *, size_t, kgid_t *);
int nfs_map_uid_to_name(const struct nfs_server *, kuid_t, char *, size_t);
int nfs_map_gid_to_group(const struct nfs_server *, kgid_t, char *, size_t);

extern unsigned int nfs_idmap_cache_timeout;
#endif /* NFS_IDMAP_H */

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