From: Pablo Neira Ayuso pablo@netfilter.org
[ Upstream commit 40ba1d9b4d19796afc9b7ece872f5f3e8f5e2c13 ]
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: f6ac85858976 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/netfilter/nf_tables.h | 6 ++---- net/netfilter/nf_tables_api.c | 17 +++++++++++------ 2 files changed, 13 insertions(+), 10 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h index b4984bbbe157..3d58acf94dd2 100644 --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -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; @@ -1329,15 +1330,12 @@ 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; diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 4893f248dfdc..e1724f9d8b9d 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -127,7 +127,7 @@ 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; } } @@ -6617,8 +6617,7 @@ 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), @@ -6691,8 +6690,11 @@ 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++; @@ -6700,8 +6702,11 @@ 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;