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NFS: Convert NFSv2 to use the container user namespace

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When mapping NFS identities, we want to substitute for the uids and
gids on the wire as we would for the AUTH_UNIX creds.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-04-24 17:46:48 -04:00 committed by Anna Schumaker
parent 58002399da
commit c207db2f5d
1 changed files with 39 additions and 19 deletions
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58
fs/nfs/nfs2xdr.c
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@ -76,6 +76,20 @@ static int nfs_stat_to_errno(enum nfs_stat);
* or decoded inline.
*/
static struct user_namespace *rpc_userns(const struct rpc_clnt *clnt)
{
if (clnt && clnt->cl_cred)
return clnt->cl_cred->user_ns;
return &init_user_ns;
}
static struct user_namespace *rpc_rqst_userns(const struct rpc_rqst *rqstp)
{
if (rqstp->rq_task)
return rpc_userns(rqstp->rq_task->tk_client);
return &init_user_ns;
}
/*
* typedef opaque nfsdata<>;
*/
@ -248,7 +262,8 @@ static __be32 *xdr_decode_time(__be32 *p, struct timespec *timep)
* };
*
*/
static int decode_fattr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
static int decode_fattr(struct xdr_stream *xdr, struct nfs_fattr *fattr,
struct user_namespace *userns)
{
u32 rdev, type;
__be32 *p;
@ -263,10 +278,10 @@ static int decode_fattr(struct xdr_stream *xdr, struct nfs_fattr *fattr)
fattr->mode = be32_to_cpup(p++);
fattr->nlink = be32_to_cpup(p++);
fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++));
fattr->uid = make_kuid(userns, be32_to_cpup(p++));
if (!uid_valid(fattr->uid))
goto out_uid;
fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++));
fattr->gid = make_kgid(userns, be32_to_cpup(p++));
if (!gid_valid(fattr->gid))
goto out_gid;
@ -321,7 +336,8 @@ static __be32 *xdr_time_not_set(__be32 *p)
return p;
}
static void encode_sattr(struct xdr_stream *xdr, const struct iattr *attr)
static void encode_sattr(struct xdr_stream *xdr, const struct iattr *attr,
struct user_namespace *userns)
{
struct timespec ts;
__be32 *p;
@ -333,11 +349,11 @@ static void encode_sattr(struct xdr_stream *xdr, const struct iattr *attr)
else
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
if (attr->ia_valid & ATTR_UID)
*p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid));
*p++ = cpu_to_be32(from_kuid_munged(userns, attr->ia_uid));
else
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
if (attr->ia_valid & ATTR_GID)
*p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid));
*p++ = cpu_to_be32(from_kgid_munged(userns, attr->ia_gid));
else
*p++ = cpu_to_be32(NFS2_SATTR_NOT_SET);
if (attr->ia_valid & ATTR_SIZE)
@ -451,7 +467,8 @@ out_cheating:
* };
*/
static int decode_attrstat(struct xdr_stream *xdr, struct nfs_fattr *result,
__u32 *op_status)
__u32 *op_status,
struct user_namespace *userns)
{
enum nfs_stat status;
int error;
@ -463,7 +480,7 @@ static int decode_attrstat(struct xdr_stream *xdr, struct nfs_fattr *result,
*op_status = status;
if (status != NFS_OK)
goto out_default;
error = decode_fattr(xdr, result);
error = decode_fattr(xdr, result, userns);
out:
return error;
out_default:
@ -498,19 +515,21 @@ static void encode_diropargs(struct xdr_stream *xdr, const struct nfs_fh *fh,
* void;
* };
*/
static int decode_diropok(struct xdr_stream *xdr, struct nfs_diropok *result)
static int decode_diropok(struct xdr_stream *xdr, struct nfs_diropok *result,
struct user_namespace *userns)
{
int error;
error = decode_fhandle(xdr, result->fh);
if (unlikely(error))
goto out;
error = decode_fattr(xdr, result->fattr);
error = decode_fattr(xdr, result->fattr, userns);
out:
return error;
}
static int decode_diropres(struct xdr_stream *xdr, struct nfs_diropok *result)
static int decode_diropres(struct xdr_stream *xdr, struct nfs_diropok *result,
struct user_namespace *userns)
{
enum nfs_stat status;
int error;
@ -520,7 +539,7 @@ static int decode_diropres(struct xdr_stream *xdr, struct nfs_diropok *result)
goto out;
if (status != NFS_OK)
goto out_default;
error = decode_diropok(xdr, result);
error = decode_diropok(xdr, result, userns);
out:
return error;
out_default:
@ -559,7 +578,7 @@ static void nfs2_xdr_enc_sattrargs(struct rpc_rqst *req,
const struct nfs_sattrargs *args = data;
encode_fhandle(xdr, args->fh);
encode_sattr(xdr, args->sattr);
encode_sattr(xdr, args->sattr, rpc_rqst_userns(req));
}
static void nfs2_xdr_enc_diropargs(struct rpc_rqst *req,
@ -674,7 +693,7 @@ static void nfs2_xdr_enc_createargs(struct rpc_rqst *req,
const struct nfs_createargs *args = data;
encode_diropargs(xdr, args->fh, args->name, args->len);
encode_sattr(xdr, args->sattr);
encode_sattr(xdr, args->sattr, rpc_rqst_userns(req));
}
static void nfs2_xdr_enc_removeargs(struct rpc_rqst *req,
@ -741,7 +760,7 @@ static void nfs2_xdr_enc_symlinkargs(struct rpc_rqst *req,
encode_diropargs(xdr, args->fromfh, args->fromname, args->fromlen);
encode_path(xdr, args->pages, args->pathlen);
encode_sattr(xdr, args->sattr);
encode_sattr(xdr, args->sattr, rpc_rqst_userns(req));
}
/*
@ -803,13 +822,13 @@ out_default:
static int nfs2_xdr_dec_attrstat(struct rpc_rqst *req, struct xdr_stream *xdr,
void *result)
{
return decode_attrstat(xdr, result, NULL);
return decode_attrstat(xdr, result, NULL, rpc_rqst_userns(req));
}
static int nfs2_xdr_dec_diropres(struct rpc_rqst *req, struct xdr_stream *xdr,
void *result)
{
return decode_diropres(xdr, result);
return decode_diropres(xdr, result, rpc_rqst_userns(req));
}
/*
@ -864,7 +883,7 @@ static int nfs2_xdr_dec_readres(struct rpc_rqst *req, struct xdr_stream *xdr,
result->op_status = status;
if (status != NFS_OK)
goto out_default;
error = decode_fattr(xdr, result->fattr);
error = decode_fattr(xdr, result->fattr, rpc_rqst_userns(req));
if (unlikely(error))
goto out;
error = decode_nfsdata(xdr, result);
@ -881,7 +900,8 @@ static int nfs2_xdr_dec_writeres(struct rpc_rqst *req, struct xdr_stream *xdr,
/* All NFSv2 writes are "file sync" writes */
result->verf->committed = NFS_FILE_SYNC;
return decode_attrstat(xdr, result->fattr, &result->op_status);
return decode_attrstat(xdr, result->fattr, &result->op_status,
rpc_rqst_userns(req));
}
/**