From: Pablo Neira Ayuso pablo@netfilter.org
commit c1592a89942e9678f7d9c8030efa777c0d57edab upstream.
Toggle deleted anonymous sets as inactive in the next generation, so users cannot perform any update on it. Clear the generation bitmask in case the transaction is aborted.
The following KASAN splat shows a set element deletion for a bound anonymous set that has been already removed in the same transaction.
[ 64.921510] ================================================================== [ 64.923123] BUG: KASAN: wild-memory-access in nf_tables_commit+0xa24/0x1490 [nf_tables] [ 64.924745] Write of size 8 at addr dead000000000122 by task test/890 [ 64.927903] CPU: 3 PID: 890 Comm: test Not tainted 6.3.0+ #253 [ 64.931120] Call Trace: [ 64.932699] <TASK> [ 64.934292] dump_stack_lvl+0x33/0x50 [ 64.935908] ? nf_tables_commit+0xa24/0x1490 [nf_tables] [ 64.937551] kasan_report+0xda/0x120 [ 64.939186] ? nf_tables_commit+0xa24/0x1490 [nf_tables] [ 64.940814] nf_tables_commit+0xa24/0x1490 [nf_tables] [ 64.942452] ? __kasan_slab_alloc+0x2d/0x60 [ 64.944070] ? nf_tables_setelem_notify+0x190/0x190 [nf_tables] [ 64.945710] ? kasan_set_track+0x21/0x30 [ 64.947323] nfnetlink_rcv_batch+0x709/0xd90 [nfnetlink] [ 64.948898] ? nfnetlink_rcv_msg+0x480/0x480 [nfnetlink]
Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/netfilter/nf_tables.h | 1 + net/netfilter/nf_tables_api.c | 12 ++++++++++++ net/netfilter/nft_dynset.c | 2 +- net/netfilter/nft_lookup.c | 2 +- net/netfilter/nft_objref.c | 2 +- 5 files changed, 16 insertions(+), 3 deletions(-)
--- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -507,6 +507,7 @@ struct nft_set_binding { };
enum nft_trans_phase; +void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set); void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, struct nft_set_binding *binding, enum nft_trans_phase phase); --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -4479,12 +4479,24 @@ static void nf_tables_unbind_set(const s } }
+void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set) +{ + if (nft_set_is_anonymous(set)) + nft_clear(ctx->net, set); + + set->use++; +} +EXPORT_SYMBOL_GPL(nf_tables_activate_set); + void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, struct nft_set_binding *binding, enum nft_trans_phase phase) { switch (phase) { case NFT_TRANS_PREPARE: + if (nft_set_is_anonymous(set)) + nft_deactivate_next(ctx->net, set); + set->use--; return; case NFT_TRANS_ABORT: --- a/net/netfilter/nft_dynset.c +++ b/net/netfilter/nft_dynset.c @@ -233,7 +233,7 @@ static void nft_dynset_activate(const st { struct nft_dynset *priv = nft_expr_priv(expr);
- priv->set->use++; + nf_tables_activate_set(ctx, priv->set); }
static void nft_dynset_destroy(const struct nft_ctx *ctx, --- a/net/netfilter/nft_lookup.c +++ b/net/netfilter/nft_lookup.c @@ -132,7 +132,7 @@ static void nft_lookup_activate(const st { struct nft_lookup *priv = nft_expr_priv(expr);
- priv->set->use++; + nf_tables_activate_set(ctx, priv->set); }
static void nft_lookup_destroy(const struct nft_ctx *ctx, --- a/net/netfilter/nft_objref.c +++ b/net/netfilter/nft_objref.c @@ -180,7 +180,7 @@ static void nft_objref_map_activate(cons { struct nft_objref_map *priv = nft_expr_priv(expr);
- priv->set->use++; + nf_tables_activate_set(ctx, priv->set); }
static void nft_objref_map_destroy(const struct nft_ctx *ctx,