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xfrm: Restrict SA direction attribute to specific netlink message types

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Reject the usage of the SA_DIR attribute in xfrm netlink messages when
it's not applicable. This ensures that SA_DIR is only accepted for
certain message types (NEWSA, UPDSA, and ALLOCSPI)

Signed-off-by: Antony Antony <antony.antony@secunet.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Antony Antony 2024-04-30 09:09:45 +02:00 committed by Steffen Klassert
parent 304b44f0d5
commit 451b509678
1 changed files with 24 additions and 0 deletions
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24
net/xfrm/xfrm_user.c
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@ -3213,6 +3213,24 @@ static const struct xfrm_link {
[XFRM_MSG_GETDEFAULT - XFRM_MSG_BASE] = { .doit = xfrm_get_default },
};
static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
struct netlink_ext_ack *extack)
{
if (attrs[XFRMA_SA_DIR]) {
switch (type) {
case XFRM_MSG_NEWSA:
case XFRM_MSG_UPDSA:
case XFRM_MSG_ALLOCSPI:
break;
default:
NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
return -EINVAL;
}
}
return 0;
}
static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@ -3272,6 +3290,12 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
goto err;
if (!link->nla_pol || link->nla_pol == xfrma_policy) {
err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
if (err < 0)
goto err;
}
if (link->doit == NULL) {
err = -EINVAL;
goto err;