diff options
| -rw-r--r-- | include/net/netlink.h | 11 | ||||
| -rw-r--r-- | lib/nlattr.c | 18 | ||||
| -rw-r--r-- | net/netlink/genetlink.c | 24 |
3 files changed, 41 insertions, 12 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index 679f649748d4..395b4406f4b0 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -401,6 +401,8 @@ struct nl_info { * are enforced going forward. * @NL_VALIDATE_STRICT_ATTRS: strict attribute policy parsing (e.g. * U8, U16, U32 must have exact size, etc.) + * @NL_VALIDATE_NESTED: Check that NLA_F_NESTED is set for NLA_NESTED(_ARRAY) + * and unset for other policies. */ enum netlink_validation { NL_VALIDATE_LIBERAL = 0, @@ -408,6 +410,7 @@ enum netlink_validation { NL_VALIDATE_MAXTYPE = BIT(1), NL_VALIDATE_UNSPEC = BIT(2), NL_VALIDATE_STRICT_ATTRS = BIT(3), + NL_VALIDATE_NESTED = BIT(4), }; #define NL_VALIDATE_DEPRECATED_STRICT (NL_VALIDATE_TRAILING |\ @@ -415,7 +418,8 @@ enum netlink_validation { #define NL_VALIDATE_STRICT (NL_VALIDATE_TRAILING |\ NL_VALIDATE_MAXTYPE |\ NL_VALIDATE_UNSPEC |\ - NL_VALIDATE_STRICT_ATTRS) + NL_VALIDATE_STRICT_ATTRS |\ + NL_VALIDATE_NESTED) int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *, struct nlmsghdr *, @@ -1132,6 +1136,11 @@ static inline int nla_parse_nested(struct nlattr *tb[], int maxtype, const struct nla_policy *policy, struct netlink_ext_ack *extack) { + if (!(nla->nla_type & NLA_F_NESTED)) { + NL_SET_ERR_MSG_ATTR(extack, nla, "NLA_F_NESTED is missing"); + return -EINVAL; + } + return __nla_parse(tb, maxtype, nla_data(nla), nla_len(nla), policy, NL_VALIDATE_STRICT, extack); } diff --git a/lib/nlattr.c b/lib/nlattr.c index 29f6336e2422..cace9b307781 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -184,6 +184,21 @@ static int validate_nla(const struct nlattr *nla, int maxtype, } } + if (validate & NL_VALIDATE_NESTED) { + if ((pt->type == NLA_NESTED || pt->type == NLA_NESTED_ARRAY) && + !(nla->nla_type & NLA_F_NESTED)) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "NLA_F_NESTED is missing"); + return -EINVAL; + } + if (pt->type != NLA_NESTED && pt->type != NLA_NESTED_ARRAY && + pt->type != NLA_UNSPEC && (nla->nla_type & NLA_F_NESTED)) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "NLA_F_NESTED not expected"); + return -EINVAL; + } + } + switch (pt->type) { case NLA_EXACT_LEN: if (attrlen != pt->len) @@ -356,7 +371,8 @@ static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype, if (type == 0 || type > maxtype) { if (validate & NL_VALIDATE_MAXTYPE) { - NL_SET_ERR_MSG(extack, "Unknown attribute type"); + NL_SET_ERR_MSG_ATTR(extack, nla, + "Unknown attribute type"); return -EINVAL; } continue; diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index 79cfa031dc7d..efccd1ac9a66 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -537,21 +537,25 @@ static int genl_family_rcv_msg(const struct genl_family *family, return -EOPNOTSUPP; if (!(ops->validate & GENL_DONT_VALIDATE_DUMP)) { - unsigned int validate = NL_VALIDATE_STRICT; int hdrlen = GENL_HDRLEN + family->hdrsize; - if (ops->validate & GENL_DONT_VALIDATE_DUMP_STRICT) - validate = NL_VALIDATE_LIBERAL; - if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen)) return -EINVAL; - rc = __nla_validate(nlmsg_attrdata(nlh, hdrlen), - nlmsg_attrlen(nlh, hdrlen), - family->maxattr, family->policy, - validate, extack); - if (rc) - return rc; + if (family->maxattr) { + unsigned int validate = NL_VALIDATE_STRICT; + + if (ops->validate & + GENL_DONT_VALIDATE_DUMP_STRICT) + validate = NL_VALIDATE_LIBERAL; + rc = __nla_validate(nlmsg_attrdata(nlh, hdrlen), + nlmsg_attrlen(nlh, hdrlen), + family->maxattr, + family->policy, + validate, extack); + if (rc) + return rc; + } } if (!family->parallel_ops) { |