From cfa0898d4ff1874b86d21768adb49d2c033fa90b Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Fri, 1 Feb 2013 03:45:54 -0800 Subject: nfs: Convert nfs2xdr to use kuids and kgids When reading uids and gids off the wire convert them to kuids and kgids. When putting kuids and kgids onto the wire first convert them to uids and gids the other side will understand. Add an additional failure mode for incoming uid or gids that are invalid. Cc: "J. Bruce Fields" Cc: Trond Myklebust Signed-off-by: "Eric W. Biederman" --- fs/nfs/nfs2xdr.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/fs/nfs/nfs2xdr.c b/fs/nfs/nfs2xdr.c index 06b9df4..62db136 100644 --- a/fs/nfs/nfs2xdr.c +++ b/fs/nfs/nfs2xdr.c @@ -290,8 +290,13 @@ 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 = be32_to_cpup(p++); - fattr->gid = be32_to_cpup(p++); + fattr->uid = make_kuid(&init_user_ns, be32_to_cpup(p++)); + if (!uid_valid(fattr->uid)) + goto out_uid; + fattr->gid = make_kgid(&init_user_ns, be32_to_cpup(p++)); + if (!gid_valid(fattr->gid)) + goto out_gid; + fattr->size = be32_to_cpup(p++); fattr->du.nfs2.blocksize = be32_to_cpup(p++); @@ -313,6 +318,12 @@ static int decode_fattr(struct xdr_stream *xdr, struct nfs_fattr *fattr) fattr->change_attr = nfs_timespec_to_change_attr(&fattr->ctime); return 0; +out_uid: + dprintk("NFS: returned invalid uid\n"); + return -EINVAL; +out_gid: + dprintk("NFS: returned invalid gid\n"); + return -EINVAL; out_overflow: print_overflow_msg(__func__, xdr); return -EIO; @@ -351,11 +362,11 @@ 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(attr->ia_uid); + *p++ = cpu_to_be32(from_kuid(&init_user_ns, attr->ia_uid)); else *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); if (attr->ia_valid & ATTR_GID) - *p++ = cpu_to_be32(attr->ia_gid); + *p++ = cpu_to_be32(from_kgid(&init_user_ns, attr->ia_gid)); else *p++ = cpu_to_be32(NFS2_SATTR_NOT_SET); if (attr->ia_valid & ATTR_SIZE) -- cgit v1.1