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nl80211: require and validate vendor command policy

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Require that each vendor command give a policy of its sub-attributes
in NL80211_ATTR_VENDOR_DATA, and then (stricly) check the contents,
including the NLA_F_NESTED flag that we couldn't check on the outer
layer because there we don't know yet.

It is possible to use VENDOR_CMD_RAW_DATA for raw data, but then no
nested data can be given (NLA_F_NESTED flag must be clear) and the
data is just passed as is to the command.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2019-05-28 10:56:03 +02:00
parent d7edf40c15
commit 901bb98918
5 changed files with 69 additions and 2 deletions
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9
include/net/netlink.h
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@ -1754,6 +1754,15 @@ static inline int __nla_validate_nested(const struct nlattr *start, int maxtype,
validate, extack);
}
static inline int
nl80211_validate_nested(const struct nlattr *start, int maxtype,
const struct nla_policy *policy,
struct netlink_ext_ack *extack)
{
return __nla_validate_nested(start, maxtype, policy,
NL_VALIDATE_STRICT, extack);
}
static inline int
nla_validate_nested_deprecated(const struct nlattr *start, int maxtype,
const struct nla_policy *policy,