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nl80211: use netlink policy validation function for elements 

Instead of open-coding a lot of calls to is_valid_ie_attr(),
add this validation directly to the policy, now that we can.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2018-10-02 10:00:08 +02:00
parent ab0d76f682
commit 3d7af87835
1 changed files with 46 additions and 76 deletions
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122
net/wireless/nl80211.c
View File

@ -200,6 +200,36 @@ cfg80211_get_dev_from_info(struct net *netns, struct genl_info *info)
return __cfg80211_rdev_from_attrs(netns, info->attrs);
}
static int validate_ie_attr(const struct nlattr *attr,
struct netlink_ext_ack *extack)
{
const u8 *pos;
int len;
pos = nla_data(attr);
len = nla_len(attr);
while (len) {
u8 elemlen;
if (len < 2)
goto error;
len -= 2;
elemlen = pos[1];
if (elemlen > len)
goto error;
len -= elemlen;
pos += 2 + elemlen;
}
return 0;
error:
NL_SET_ERR_MSG_ATTR(extack, attr, "malformed information elements");
return -EINVAL;
}
/* policy for the attributes */
static const struct nla_policy
nl80211_ftm_responder_policy[NL80211_FTM_RESP_ATTR_MAX + 1] = {
@ -250,8 +280,9 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_DTIM_PERIOD] = { .type = NLA_U32 },
[NL80211_ATTR_BEACON_HEAD] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_BEACON_TAIL] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_BEACON_TAIL] =
NLA_POLICY_VALIDATE_FN(NLA_BINARY, validate_ie_attr,
IEEE80211_MAX_DATA_LEN),
[NL80211_ATTR_STA_AID] =
NLA_POLICY_RANGE(NLA_U16, 1, IEEE80211_MAX_AID),
[NL80211_ATTR_STA_FLAGS] = { .type = NLA_NESTED },
@ -282,8 +313,9 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_HT_CAPABILITY] = { .len = NL80211_HT_CAPABILITY_LEN },
[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
[NL80211_ATTR_IE] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_IE] = NLA_POLICY_VALIDATE_FN(NLA_BINARY,
validate_ie_attr,
IEEE80211_MAX_DATA_LEN),
[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
@ -341,10 +373,12 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
NLA_POLICY_RANGE(NLA_U32,
NL80211_HIDDEN_SSID_NOT_IN_USE,
NL80211_HIDDEN_SSID_ZERO_CONTENTS),
[NL80211_ATTR_IE_PROBE_RESP] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_IE_ASSOC_RESP] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_ATTR_IE_PROBE_RESP] =
NLA_POLICY_VALIDATE_FN(NLA_BINARY, validate_ie_attr,
IEEE80211_MAX_DATA_LEN),
[NL80211_ATTR_IE_ASSOC_RESP] =
NLA_POLICY_VALIDATE_FN(NLA_BINARY, validate_ie_attr,
IEEE80211_MAX_DATA_LEN),
[NL80211_ATTR_ROAM_SUPPORT] = { .type = NLA_FLAG },
[NL80211_ATTR_SCHED_SCAN_MATCH] = { .type = NLA_NESTED },
[NL80211_ATTR_TX_NO_CCK_RATE] = { .type = NLA_FLAG },
@ -649,36 +683,6 @@ static int nl80211_prepare_wdev_dump(struct netlink_callback *cb,
return 0;
}
/* IE validation */
static bool is_valid_ie_attr(const struct nlattr *attr)
{
const u8 *pos;
int len;
if (!attr)
return true;
pos = nla_data(attr);
len = nla_len(attr);
while (len) {
u8 elemlen;
if (len < 2)
return false;
len -= 2;
elemlen = pos[1];
if (elemlen > len)
return false;
len -= elemlen;
pos += 2 + elemlen;
}
return true;
}
/* message building helper */
static inline void *nl80211hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
int flags, u8 cmd)
@ -4018,12 +4022,6 @@ static int nl80211_parse_beacon(struct cfg80211_registered_device *rdev,
bool haveinfo = false;
int err;
if (!is_valid_ie_attr(attrs[NL80211_ATTR_BEACON_TAIL]) ||
!is_valid_ie_attr(attrs[NL80211_ATTR_IE]) ||
!is_valid_ie_attr(attrs[NL80211_ATTR_IE_PROBE_RESP]) ||
!is_valid_ie_attr(attrs[NL80211_ATTR_IE_ASSOC_RESP]))
return -EINVAL;
memset(bcn, 0, sizeof(*bcn));
if (attrs[NL80211_ATTR_BEACON_HEAD]) {
@ -6189,8 +6187,9 @@ static const struct nla_policy
[NL80211_MESH_SETUP_USERSPACE_AUTH] = { .type = NLA_FLAG },
[NL80211_MESH_SETUP_AUTH_PROTOCOL] = { .type = NLA_U8 },
[NL80211_MESH_SETUP_USERSPACE_MPM] = { .type = NLA_FLAG },
[NL80211_MESH_SETUP_IE] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_DATA_LEN },
[NL80211_MESH_SETUP_IE] =
NLA_POLICY_VALIDATE_FN(NLA_BINARY, validate_ie_attr,
IEEE80211_MAX_DATA_LEN),
[NL80211_MESH_SETUP_USERSPACE_AMPE] = { .type = NLA_FLAG },
};
@ -6370,8 +6369,6 @@ static int nl80211_parse_mesh_setup(struct genl_info *info,
if (tb[NL80211_MESH_SETUP_IE]) {
struct nlattr *ieattr =
tb[NL80211_MESH_SETUP_IE];
if (!is_valid_ie_attr(ieattr))
return -EINVAL;
setup->ie = nla_data(ieattr);
setup->ie_len = nla_len(ieattr);
}
@ -7004,9 +7001,6 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
int err, tmp, n_ssids = 0, n_channels, i;
size_t ie_len;
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
wiphy = &rdev->wiphy;
if (wdev->iftype == NL80211_IFTYPE_NAN)
@ -7360,9 +7354,6 @@ nl80211_parse_sched_scan(struct wiphy *wiphy, struct wireless_dev *wdev,
struct nlattr *tb[NL80211_SCHED_SCAN_MATCH_ATTR_MAX + 1];
s32 default_match_rssi = NL80211_SCAN_RSSI_THOLD_OFF;
if (!is_valid_ie_attr(attrs[NL80211_ATTR_IE]))
return ERR_PTR(-EINVAL);
if (attrs[NL80211_ATTR_SCAN_FREQUENCIES]) {
n_channels = validate_scan_freqs(
attrs[NL80211_ATTR_SCAN_FREQUENCIES]);
@ -8330,9 +8321,6 @@ static int nl80211_authenticate(struct sk_buff *skb, struct genl_info *info)
struct key_parse key;
bool local_state_change;
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
if (!info->attrs[NL80211_ATTR_MAC])
return -EINVAL;
@ -8571,9 +8559,6 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
dev->ieee80211_ptr->conn_owner_nlportid != info->snd_portid)
return -EPERM;
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
if (!info->attrs[NL80211_ATTR_MAC] ||
!info->attrs[NL80211_ATTR_SSID] ||
!info->attrs[NL80211_ATTR_WIPHY_FREQ])
@ -8697,9 +8682,6 @@ static int nl80211_deauthenticate(struct sk_buff *skb, struct genl_info *info)
dev->ieee80211_ptr->conn_owner_nlportid != info->snd_portid)
return -EPERM;
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
if (!info->attrs[NL80211_ATTR_MAC])
return -EINVAL;
@ -8748,9 +8730,6 @@ static int nl80211_disassociate(struct sk_buff *skb, struct genl_info *info)
dev->ieee80211_ptr->conn_owner_nlportid != info->snd_portid)
return -EPERM;
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
if (!info->attrs[NL80211_ATTR_MAC])
return -EINVAL;
@ -8825,9 +8804,6 @@ static int nl80211_join_ibss(struct sk_buff *skb, struct genl_info *info)
memset(&ibss, 0, sizeof(ibss));
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
if (!info->attrs[NL80211_ATTR_SSID] ||
!nla_len(info->attrs[NL80211_ATTR_SSID]))
return -EINVAL;
@ -9265,9 +9241,6 @@ static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
memset(&connect, 0, sizeof(connect));
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
if (!info->attrs[NL80211_ATTR_SSID] ||
!nla_len(info->attrs[NL80211_ATTR_SSID]))
return -EINVAL;
@ -9498,8 +9471,6 @@ static int nl80211_update_connect_params(struct sk_buff *skb,
return -EOPNOTSUPP;
if (info->attrs[NL80211_ATTR_IE]) {
if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
return -EINVAL;
connect.ie = nla_data(info->attrs[NL80211_ATTR_IE]);
connect.ie_len = nla_len(info->attrs[NL80211_ATTR_IE]);
changed |= UPDATE_ASSOC_IES;
@ -12159,8 +12130,7 @@ static int nl80211_update_ft_ies(struct sk_buff *skb, struct genl_info *info)
return -EOPNOTSUPP;
if (!info->attrs[NL80211_ATTR_MDID] ||
!info->attrs[NL80211_ATTR_IE] ||
!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
!info->attrs[NL80211_ATTR_IE])
return -EINVAL;
memset(&ft_params, 0, sizeof(ft_params));