From: Pablo Neira Ayuso pablo@netfilter.org

mainline inclusion from mainline-v6.9-rc5 commit 86a1471d7cde792941109b93b558b5dc078b9ee9 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9L5OD CVE: CVE-2024-27011

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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The delete set command does not rely on the transaction object for element removal, therefore, a combination of delete element + delete set from the abort path could result in restoring twice the refcount of the mapping.

Check for inactive element in the next generation for the delete element command in the abort path, skip restoring state if next generation bit has been already cleared. This is similar to the activate logic using the set walk iterator.

[ 6170.286929] ------------[ cut here ]------------ [ 6170.286939] WARNING: CPU: 6 PID: 790302 at net/netfilter/nf_tables_api.c:2086 nf_tables_chain_destroy+0x1f7/0x220 [nf_tables] [ 6170.287071] Modules linked in: [...] [ 6170.287633] CPU: 6 PID: 790302 Comm: kworker/6:2 Not tainted 6.9.0-rc3+ #365 [ 6170.287768] RIP: 0010:nf_tables_chain_destroy+0x1f7/0x220 [nf_tables] [ 6170.287886] Code: df 48 8d 7d 58 e8 69 2e 3b df 48 8b 7d 58 e8 80 1b 37 df 48 8d 7d 68 e8 57 2e 3b df 48 8b 7d 68 e8 6e 1b 37 df 48 89 ef eb c4 <0f> 0b 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 0f [ 6170.287895] RSP: 0018:ffff888134b8fd08 EFLAGS: 00010202 [ 6170.287904] RAX: 0000000000000001 RBX: ffff888125bffb28 RCX: dffffc0000000000 [ 6170.287912] RDX: 0000000000000003 RSI: ffffffffa20298ab RDI: ffff88811ebe4750 [ 6170.287919] RBP: ffff88811ebe4700 R08: ffff88838e812650 R09: fffffbfff0623a55 [ 6170.287926] R10: ffffffff8311d2af R11: 0000000000000001 R12: ffff888125bffb10 [ 6170.287933] R13: ffff888125bffb10 R14: dead000000000122 R15: dead000000000100 [ 6170.287940] FS: 0000000000000000(0000) GS:ffff888390b00000(0000) knlGS:0000000000000000 [ 6170.287948] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6170.287955] CR2: 00007fd31fc00710 CR3: 0000000133f60004 CR4: 00000000001706f0 [ 6170.287962] Call Trace: [ 6170.287967] <TASK> [ 6170.287973] ? __warn+0x9f/0x1a0 [ 6170.287986] ? nf_tables_chain_destroy+0x1f7/0x220 [nf_tables] [ 6170.288092] ? report_bug+0x1b1/0x1e0 [ 6170.287986] ? nf_tables_chain_destroy+0x1f7/0x220 [nf_tables] [ 6170.288092] ? report_bug+0x1b1/0x1e0 [ 6170.288104] ? handle_bug+0x3c/0x70 [ 6170.288112] ? exc_invalid_op+0x17/0x40 [ 6170.288120] ? asm_exc_invalid_op+0x1a/0x20 [ 6170.288132] ? nf_tables_chain_destroy+0x2b/0x220 [nf_tables] [ 6170.288243] ? nf_tables_chain_destroy+0x1f7/0x220 [nf_tables] [ 6170.288366] ? nf_tables_chain_destroy+0x2b/0x220 [nf_tables] [ 6170.288483] nf_tables_trans_destroy_work+0x588/0x590 [nf_tables]

Fixes: 591054469b3e ("netfilter: nf_tables: revisit chain/object refcounting from elements") Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org

Conflicts: net/netfilter/nf_tables_api.c [Did not backport the commit aaa31047a6d2 ("netfilter: nftables: add catch-all set element support"), commit f80a612dd77c ("netfilter: nf_tables: add support to destroy operation"), and commit 0e1ea651c971 ("netfilter: nf_tables: shrink memory consumption of set elements").] Signed-off-by: Liu Jian liujian56@huawei.com --- net/netfilter/nf_tables_api.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 4089580145fe..f70fedb98695 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -4702,6 +4702,16 @@ void nft_data_hold(const struct nft_data *data, enum nft_data_types type) } }

+static int nft_setelem_active_next(const struct net *net, + const struct nft_set *set, + struct nft_set_elem *elem) +{ + const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv); + u8 genmask = nft_genmask_next(net); + + return nft_set_elem_active(ext, genmask); +} + static void nft_set_elem_activate(const struct net *net, const struct nft_set *set, struct nft_set_elem *elem) @@ -6806,8 +6816,10 @@ static int __nf_tables_abort(struct net *net) case NFT_MSG_DELSETELEM: te = (struct nft_trans_elem *)trans->data;

- nft_set_elem_activate(net, te->set, &te->elem); - te->set->ops->activate(net, te->set, &te->elem); + if (!nft_setelem_active_next(net, te->set, &te->elem)) { + nft_set_elem_activate(net, te->set, &te->elem); + te->set->ops->activate(net, te->set, &te->elem); + } te->set->ndeact--;

nft_trans_destroy(trans);