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netfilter: nf_tables: fix set double-free in abort path

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The abort path can cause a double-free of an anonymous set.
Added-and-to-be-aborted rule looks like this:

udp dport { 137, 138 } drop

The to-be-aborted transaction list looks like this:

newset
newsetelem
newsetelem
rule

This gets walked in reverse order, so first pass disables the rule, the
set elements, then the set.

After synchronize_rcu(), we then destroy those in same order: rule, set
element, set element, newset.

Problem is that the anonymous set has already been bound to the rule, so
the rule (lookup expression destructor) already frees the set, when then
cause use-after-free when trying to delete the elements from this set,
then try to free the set again when handling the newset expression.

Rule releases the bound set in first place from the abort path, this
causes the use-after-free on set element removal when undoing the new
element transactions. To handle this, skip new element transaction if
set is bound from the abort path.

This is still causes the use-after-free on set element removal.  To
handle this, remove transaction from the list when the set is already
bound.

Joint work with Florian Westphal.

Fixes: f6ac858589 ("netfilter: nf_tables: unbind set in rule from commit path")
Bugzilla: https://bugzilla.netfilter.org/show_bug.cgi?id=1325
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2019-03-08 00:58:53 +01:00
parent 46f7487e16
commit 40ba1d9b4d
2 changed files with 13 additions and 10 deletions
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6
include/net/netfilter/nf_tables.h
View File

@ -416,7 +416,8 @@ struct nft_set {
unsigned char *udata;
/* runtime data below here */
const struct nft_set_ops *ops ____cacheline_aligned;
u16 flags:14,
u16 flags:13,
bound:1,
genmask:2;
u8 klen;
u8 dlen;
@ -1344,15 +1345,12 @@ struct nft_trans_rule {
struct nft_trans_set {
struct nft_set *set;
u32 set_id;
bool bound;
};
#define nft_trans_set(trans) \
(((struct nft_trans_set *)trans->data)->set)
#define nft_trans_set_id(trans) \
(((struct nft_trans_set *)trans->data)->set_id)
#define nft_trans_set_bound(trans) \
(((struct nft_trans_set *)trans->data)->bound)
struct nft_trans_chain {
bool update;

17
net/netfilter/nf_tables_api.c
View File

@ -142,7 +142,7 @@ static void nft_set_trans_bind(const struct nft_ctx *ctx, struct nft_set *set)
list_for_each_entry_reverse(trans, &net->nft.commit_list, list) {
if (trans->msg_type == NFT_MSG_NEWSET &&
nft_trans_set(trans) == set) {
nft_trans_set_bound(trans) = true;
set->bound = true;
break;
}
}
@ -6709,8 +6709,7 @@ static void nf_tables_abort_release(struct nft_trans *trans)
nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
break;
case NFT_MSG_NEWSET:
if (!nft_trans_set_bound(trans))
nft_set_destroy(nft_trans_set(trans));
nft_set_destroy(nft_trans_set(trans));
break;
case NFT_MSG_NEWSETELEM:
nft_set_elem_destroy(nft_trans_elem_set(trans),
@ -6783,8 +6782,11 @@ static int __nf_tables_abort(struct net *net)
break;
case NFT_MSG_NEWSET:
trans->ctx.table->use--;
if (!nft_trans_set_bound(trans))
list_del_rcu(&nft_trans_set(trans)->list);
if (nft_trans_set(trans)->bound) {
nft_trans_destroy(trans);
break;
}
list_del_rcu(&nft_trans_set(trans)->list);
break;
case NFT_MSG_DELSET:
trans->ctx.table->use++;
@ -6792,8 +6794,11 @@ static int __nf_tables_abort(struct net *net)
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWSETELEM:
if (nft_trans_elem_set(trans)->bound) {
nft_trans_destroy(trans);
break;
}
te = (struct nft_trans_elem *)trans->data;
te->set->ops->remove(net, te->set, &te->elem);
atomic_dec(&te->set->nelems);
break;