summaryrefslogtreecommitdiff
path: root/fs/nfsd/nfs4idmap.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nfsd/nfs4idmap.c')
-rw-r--r--fs/nfsd/nfs4idmap.c146
1 files changed, 93 insertions, 53 deletions
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index 4832fd819f88..8cca1329f348 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -41,6 +41,7 @@
#include "idmap.h"
#include "nfsd.h"
#include "netns.h"
+#include "vfs.h"
/*
* Turn off idmapping when using AUTH_SYS.
@@ -59,15 +60,13 @@ MODULE_PARM_DESC(nfs4_disable_idmapping,
* that.
*/
-#define IDMAP_TYPE_USER 0
-#define IDMAP_TYPE_GROUP 1
-
struct ent {
struct cache_head h;
int type; /* User / Group */
u32 id;
char name[IDMAP_NAMESZ];
char authname[IDMAP_NAMESZ];
+ struct rcu_head rcu_head;
};
/* Common entry handling */
@@ -84,15 +83,15 @@ ent_init(struct cache_head *cnew, struct cache_head *citm)
new->id = itm->id;
new->type = itm->type;
- strlcpy(new->name, itm->name, sizeof(new->name));
- strlcpy(new->authname, itm->authname, sizeof(new->name));
+ strscpy(new->name, itm->name, sizeof(new->name));
+ strscpy(new->authname, itm->authname, sizeof(new->authname));
}
static void
ent_put(struct kref *ref)
{
struct ent *map = container_of(ref, struct ent, h.ref);
- kfree(map);
+ kfree_rcu(map, rcu_head);
}
static struct cache_head *
@@ -124,6 +123,12 @@ idtoname_hash(struct ent *ent)
return hash;
}
+static int
+idtoname_upcall(struct cache_detail *cd, struct cache_head *h)
+{
+ return sunrpc_cache_pipe_upcall_timeout(cd, h);
+}
+
static void
idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
int *blen)
@@ -164,7 +169,7 @@ idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
ent->id);
if (test_bit(CACHE_VALID, &h->flags))
seq_printf(m, " %s", ent->name);
- seq_printf(m, "\n");
+ seq_putc(m, '\n');
return 0;
}
@@ -181,11 +186,12 @@ static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
static struct ent *idtoname_update(struct cache_detail *, struct ent *,
struct ent *);
-static struct cache_detail idtoname_cache_template = {
+static const struct cache_detail idtoname_cache_template = {
.owner = THIS_MODULE,
.hash_size = ENT_HASHMAX,
.name = "nfs4.idtoname",
.cache_put = ent_put,
+ .cache_upcall = idtoname_upcall,
.cache_request = idtoname_request,
.cache_parse = idtoname_parse,
.cache_show = idtoname_show,
@@ -215,7 +221,8 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
memset(&ent, 0, sizeof(ent));
/* Authentication name */
- if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
+ len = qword_get(&buf, buf1, PAGE_SIZE);
+ if (len <= 0 || len >= IDMAP_NAMESZ)
goto out;
memcpy(ent.authname, buf1, sizeof(ent.authname));
@@ -233,8 +240,8 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
goto out;
/* expiry */
- ent.h.expiry_time = get_expiry(&buf);
- if (ent.h.expiry_time == 0)
+ error = get_expiry(&buf, &ent.h.expiry_time);
+ if (error)
goto out;
error = -ENOMEM;
@@ -245,12 +252,10 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
/* Name */
error = -EINVAL;
len = qword_get(&buf, buf1, PAGE_SIZE);
- if (len < 0)
+ if (len < 0 || len >= IDMAP_NAMESZ)
goto out;
if (len == 0)
set_bit(CACHE_NEGATIVE, &ent.h.flags);
- else if (len >= IDMAP_NAMESZ)
- goto out;
else
memcpy(ent.name, buf1, sizeof(ent.name));
error = -ENOMEM;
@@ -259,20 +264,17 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
goto out;
cache_put(&res->h, cd);
-
error = 0;
out:
kfree(buf1);
-
return error;
}
-
static struct ent *
idtoname_lookup(struct cache_detail *cd, struct ent *item)
{
- struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
- idtoname_hash(item));
+ struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h,
+ idtoname_hash(item));
if (ch)
return container_of(ch, struct ent, h);
else
@@ -301,6 +303,12 @@ nametoid_hash(struct ent *ent)
return hash_str(ent->name, ENT_HASHBITS);
}
+static int
+nametoid_upcall(struct cache_detail *cd, struct cache_head *h)
+{
+ return sunrpc_cache_pipe_upcall_timeout(cd, h);
+}
+
static void
nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
int *blen)
@@ -339,7 +347,7 @@ nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
ent->name);
if (test_bit(CACHE_VALID, &h->flags))
seq_printf(m, " %u", ent->id);
- seq_printf(m, "\n");
+ seq_putc(m, '\n');
return 0;
}
@@ -348,11 +356,12 @@ static struct ent *nametoid_update(struct cache_detail *, struct ent *,
struct ent *);
static int nametoid_parse(struct cache_detail *, char *, int);
-static struct cache_detail nametoid_cache_template = {
+static const struct cache_detail nametoid_cache_template = {
.owner = THIS_MODULE,
.hash_size = ENT_HASHMAX,
.name = "nfs4.nametoid",
.cache_put = ent_put,
+ .cache_upcall = nametoid_upcall,
.cache_request = nametoid_request,
.cache_parse = nametoid_parse,
.cache_show = nametoid_show,
@@ -368,7 +377,7 @@ nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
{
struct ent ent, *res;
char *buf1;
- int error = -EINVAL;
+ int len, error = -EINVAL;
if (buf[buflen - 1] != '\n')
return (-EINVAL);
@@ -381,7 +390,8 @@ nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
memset(&ent, 0, sizeof(ent));
/* Authentication name */
- if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
+ len = qword_get(&buf, buf1, PAGE_SIZE);
+ if (len <= 0 || len >= IDMAP_NAMESZ)
goto out;
memcpy(ent.authname, buf1, sizeof(ent.authname));
@@ -392,14 +402,14 @@ nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
/* Name */
- error = qword_get(&buf, buf1, PAGE_SIZE);
- if (error <= 0 || error >= IDMAP_NAMESZ)
+ len = qword_get(&buf, buf1, PAGE_SIZE);
+ if (len <= 0 || len >= IDMAP_NAMESZ)
goto out;
memcpy(ent.name, buf1, sizeof(ent.name));
/* expiry */
- ent.h.expiry_time = get_expiry(&buf);
- if (ent.h.expiry_time == 0)
+ error = get_expiry(&buf, &ent.h.expiry_time);
+ if (error)
goto out;
/* ID */
@@ -421,7 +431,6 @@ nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
error = 0;
out:
kfree(buf1);
-
return (error);
}
@@ -429,8 +438,8 @@ out:
static struct ent *
nametoid_lookup(struct cache_detail *cd, struct ent *item)
{
- struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
- nametoid_hash(item));
+ struct cache_head *ch = sunrpc_cache_lookup_rcu(cd, &item->h,
+ nametoid_hash(item));
if (ch)
return container_of(ch, struct ent, h);
else
@@ -540,7 +549,7 @@ idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen
return nfserr_badowner;
memcpy(key.name, name, namelen);
key.name[namelen] = '\0';
- strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
+ strscpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
if (ret == -ENOENT)
return nfserr_badowner;
@@ -551,27 +560,50 @@ idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen
return 0;
}
-static int
-idmap_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
+static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id)
+{
+ char buf[11];
+ int len;
+ __be32 *p;
+
+ len = sprintf(buf, "%u", id);
+ p = xdr_reserve_space(xdr, len + 4);
+ if (!p)
+ return nfserr_resource;
+ p = xdr_encode_opaque(p, buf, len);
+ return 0;
+}
+
+static __be32 idmap_id_to_name(struct xdr_stream *xdr,
+ struct svc_rqst *rqstp, int type, u32 id)
{
struct ent *item, key = {
.id = id,
.type = type,
};
+ __be32 status = nfs_ok;
+ __be32 *p;
int ret;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
- strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
+ strscpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
if (ret == -ENOENT)
- return sprintf(name, "%u", id);
+ return encode_ascii_id(xdr, id);
if (ret)
- return ret;
+ return nfserrno(ret);
ret = strlen(item->name);
- BUG_ON(ret > IDMAP_NAMESZ);
- memcpy(name, item->name, ret);
+ WARN_ON_ONCE(ret > IDMAP_NAMESZ);
+
+ p = xdr_reserve_space(xdr, ret + 4);
+ if (unlikely(!p)) {
+ status = nfserr_resource;
+ goto out_put;
+ }
+ xdr_encode_opaque(p, item->name, ret);
+out_put:
cache_put(&item->h, nn->idtoname_cache);
- return ret;
+ return status;
}
static bool
@@ -603,12 +635,12 @@ do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u
return idmap_name_to_id(rqstp, type, name, namelen, id);
}
-static int
-do_id_to_name(struct svc_rqst *rqstp, int type, u32 id, char *name)
+static __be32 encode_name_from_id(struct xdr_stream *xdr,
+ struct svc_rqst *rqstp, int type, u32 id)
{
if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
- return sprintf(name, "%u", id);
- return idmap_id_to_name(rqstp, type, id, name);
+ return encode_ascii_id(xdr, id);
+ return idmap_id_to_name(xdr, rqstp, type, id);
}
__be32
@@ -617,8 +649,12 @@ nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
{
__be32 status;
u32 id = -1;
+
+ if (name == NULL || namelen == 0)
+ return nfserr_inval;
+
status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
- *uid = make_kuid(&init_user_ns, id);
+ *uid = make_kuid(nfsd_user_namespace(rqstp), id);
if (!uid_valid(*uid))
status = nfserr_badowner;
return status;
@@ -630,23 +666,27 @@ nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
{
__be32 status;
u32 id = -1;
+
+ if (name == NULL || namelen == 0)
+ return nfserr_inval;
+
status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
- *gid = make_kgid(&init_user_ns, id);
+ *gid = make_kgid(nfsd_user_namespace(rqstp), id);
if (!gid_valid(*gid))
status = nfserr_badowner;
return status;
}
-int
-nfsd_map_uid_to_name(struct svc_rqst *rqstp, kuid_t uid, char *name)
+__be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ kuid_t uid)
{
- u32 id = from_kuid(&init_user_ns, uid);
- return do_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
+ u32 id = from_kuid_munged(nfsd_user_namespace(rqstp), uid);
+ return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
}
-int
-nfsd_map_gid_to_name(struct svc_rqst *rqstp, kgid_t gid, char *name)
+__be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ kgid_t gid)
{
- u32 id = from_kgid(&init_user_ns, gid);
- return do_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
+ u32 id = from_kgid_munged(nfsd_user_namespace(rqstp), gid);
+ return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
}
generated by cgit (git 2.34.1) at 2025-12-25 03:05:00 +0000