[PATCH net 0/1] Netfilter fixes for net

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following series contains one fix:

syzkaller managed to triger UaF due to missing reference on netns in
bpf infrastructure, from Florian Westphal.

Florian Westphal (1):
  netfilter: bpf: must hold reference on net namespace

 net/netfilter/nf_bpf_link.c | 4 ++++
 1 file changed, 4 insertions(+)

-- 
2.30.2

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git nf-24-10-17

Thanks.

----------------------------------------------------------------

The following changes since commit cb560795c8c2ceca1d36a95f0d1b2eafc4074e37:

  Merge branch 'mlx5-misc-fixes-2024-10-15' (2024-10-17 12:14:11 +0200)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git tags/nf-24-10-17

for you to fetch changes up to 1230fe7ad3974f7bf6c78901473e039b34d4fb1f:

  netfilter: bpf: must hold reference on net namespace (2024-10-17 13:58:57 +0200)

----------------------------------------------------------------
netfilter pull request 24-10-17

----------------------------------------------------------------
Florian Westphal (1):
      netfilter: bpf: must hold reference on net namespace

 net/netfilter/nf_bpf_link.c | 4 ++++
 1 file changed, 4 insertions(+)

[PATCH net 1/1] netfilter: bpf: must hold reference on net namespace

[Pablo Neira Ayuso]

From: Florian Westphal <fw@strlen.de>

BUG: KASAN: slab-use-after-free in __nf_unregister_net_hook+0x640/0x6b0
Read of size 8 at addr ffff8880106fe400 by task repro/72=
bpf_nf_link_release+0xda/0x1e0
bpf_link_free+0x139/0x2d0
bpf_link_release+0x68/0x80
__fput+0x414/0xb60

Eric says:
 It seems that bpf was able to defer the __nf_unregister_net_hook()
 after exit()/close() time.
 Perhaps a netns reference is missing, because the netns has been
 dismantled/freed already.
 bpf_nf_link_attach() does :
 link->net = net;
 But I do not see a reference being taken on net.

Add such a reference and release it after hook unreg.
Note that I was unable to get syzbot reproducer to work, so I
do not know if this resolves this splat.

Fixes: 84601d6ee68a ("bpf: add bpf_link support for BPF_NETFILTER programs")
Diagnosed-by: Eric Dumazet <edumazet@google.com>
Reported-by: Lai, Yi <yi1.lai@linux.intel.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_bpf_link.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/netfilter/nf_bpf_link.c b/net/netfilter/nf_bpf_link.c
index 5257d5e7eb09..e5e79a08c10b 100644
--- a/net/netfilter/nf_bpf_link.c
+++ b/net/netfilter/nf_bpf_link.c
@@ -23,6 +23,7 @@ static unsigned int nf_hook_run_bpf(void *bpf_prog, struct sk_buff *skb,
 struct bpf_nf_link {
 	struct bpf_link link;
 	struct nf_hook_ops hook_ops;
+	netns_tracker ns_tracker;
 	struct net *net;
 	u32 dead;
 	const struct nf_defrag_hook *defrag_hook;
@@ -120,6 +121,7 @@ static void bpf_nf_link_release(struct bpf_link *link)
 	if (!cmpxchg(&nf_link->dead, 0, 1)) {
 		nf_unregister_net_hook(nf_link->net, &nf_link->hook_ops);
 		bpf_nf_disable_defrag(nf_link);
+		put_net_track(nf_link->net, &nf_link->ns_tracker);
 	}
 }
 
@@ -257,6 +259,8 @@ int bpf_nf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
 		return err;
 	}
 
+	get_net_track(net, &link->ns_tracker, GFP_KERNEL);
+
 	return bpf_link_settle(&link_primer);
 }
 
-- 
2.30.2

Re: [PATCH net 0/1] Netfilter fixes for net

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Pablo Neira Ayuso <pablo@netfilter.org>:

On Thu, 17 Oct 2024 14:34:12 +0200 you wrote:
> Hi,
> 
> The following series contains one fix:
> 
> syzkaller managed to triger UaF due to missing reference on netns in
> bpf infrastructure, from Florian Westphal.
> 
> [...]

Here is the summary with links:
  - [net,1/1] netfilter: bpf: must hold reference on net namespace
    https://git.kernel.org/netdev/net/c/1230fe7ad397

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following batch contains one revert for:

1) Revert flowtable entry teardown cycle when skbuff exceeds mtu to
   deal with DF flag unset scenarios. This is reverts a patch coming
   in the previous merge window (available in 6.14-rc releases).

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git nf-25-02-13

Thanks.

----------------------------------------------------------------

The following changes since commit e589adf5b70c07b1ab974d077046fdbf583b2f36:

  iavf: Fix a locking bug in an error path (2025-02-11 18:02:04 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git tags/nf-25-02-13

for you to fetch changes up to cf56aa8dd26328a9af4ffe7fb0bd8fcfa9407112:

  Revert "netfilter: flowtable: teardown flow if cached mtu is stale" (2025-02-12 10:35:20 +0100)

----------------------------------------------------------------
netfilter pull request 25-02-13

----------------------------------------------------------------
Pablo Neira Ayuso (1):
      Revert "netfilter: flowtable: teardown flow if cached mtu is stale"

 net/netfilter/nf_flow_table_ip.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following batch contains one Netfilter fix:

1) Reject mismatching sum of field_len with set key length which allows
   to create a set without inconsistent pipapo rule width and set key
   length.

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git nf-25-01-30

Thanks.

----------------------------------------------------------------

The following changes since commit 0a5b8fff01bde1b9908f00004c676f2e2459333b:

  selftests: net: Adapt ethtool mq tests to fix in qdisc graft (2025-01-15 09:28:51 +0000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git tags/nf-25-01-30

for you to fetch changes up to 1b9335a8000fb70742f7db10af314104b6ace220:

  netfilter: nf_tables: reject mismatching sum of field_len with set key length (2025-01-30 12:26:11 +0100)

----------------------------------------------------------------
netfilter pull request 25-01-30

----------------------------------------------------------------
Pablo Neira Ayuso (1):
      netfilter: nf_tables: reject mismatching sum of field_len with set key length

 net/netfilter/nf_tables_api.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following batch contains one Netfilter fix for net:

1) Fix unaligned atomic read on struct nft_set_ext in nft_set_hash
   backend that causes an alignment failure splat on aarch64. This
   is related to a recent fix and it has been reported via the
   regressions mailing list.

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git nf-24-12-25

Thanks.

----------------------------------------------------------------

The following changes since commit b3a69c559899b00ca106767c873680b0adf5882c:

  Merge branch 'mlx5-misc-fixes-2024-12-20' (2024-12-23 10:54:07 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git tags/nf-24-12-25

for you to fetch changes up to 542ed8145e6f9392e3d0a86a0e9027d2ffd183e4:

  netfilter: nft_set_hash: unaligned atomic read on struct nft_set_ext (2024-12-25 00:27:49 +0100)

----------------------------------------------------------------
netfilter pull request 24-12-25

----------------------------------------------------------------
Pablo Neira Ayuso (1):
      netfilter: nft_set_hash: unaligned atomic read on struct nft_set_ext

 include/net/netfilter/nf_tables.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following patchset contains a Netfilter fix for net:

Patch #1 if FPU is busy, then pipapo set backend falls back to standard
         set element lookup. Moreover, disable bh while at this.
	 From Florian Westphal.

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git nf-24-07-24

Thanks.

----------------------------------------------------------------

The following changes since commit 3ba359c0cd6eb5ea772125a7aededb4a2d516684:

  net: bonding: correctly annotate RCU in bond_should_notify_peers() (2024-07-23 15:13:12 +0200)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git tags/nf-24-07-24

for you to fetch changes up to a16909ae9982e931841c456061cb57fbaec9c59e:

  netfilter: nft_set_pipapo_avx2: disable softinterrupts (2024-07-24 10:01:59 +0200)

----------------------------------------------------------------
netfilter pull request 24-07-24

----------------------------------------------------------------
Florian Westphal (1):
      netfilter: nft_set_pipapo_avx2: disable softinterrupts

 net/netfilter/nft_set_pipapo_avx2.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following batch contains a oneliner patch to inconditionally flush
workqueue containing stale objects to be released, syzbot managed to
trigger UaF. Patch from Florian Westphal.

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git nf-24-07-04

Thanks.

----------------------------------------------------------------

The following changes since commit 8905a2c7d39b921b8a62bcf80da0f8c45ec0e764:

  Merge branch 'net-txgbe-fix-msi-and-intx-interrupts' (2024-07-02 16:07:07 +0200)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git tags/nf-24-07-04

for you to fetch changes up to 9f6958ba2e902f9820c594869bd710ba74b7c4c0:

  netfilter: nf_tables: unconditionally flush pending work before notifier (2024-07-04 00:28:27 +0200)

----------------------------------------------------------------
netfilter pull request 24-07-04

----------------------------------------------------------------
Florian Westphal (1):
      netfilter: nf_tables: unconditionally flush pending work before notifier

 net/netfilter/nf_tables_api.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following patchset contains one Netfilter fix:

1) Restore 'ct state untracked' matching with CONFIG_RETPOLINE=y,
   from Florian Westphal.

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git

Thanks.

----------------------------------------------------------------

The following changes since commit 6a341729fb31b4c5df9f74f24b4b1c98410c9b87:

  af_packet: Don't send zero-byte data in packet_sendmsg_spkt(). (2023-05-03 09:20:18 +0100)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git nf-23-05-03

for you to fetch changes up to f057b63bc11d86a98176de31b437e46789f44d8f:

  netfilter: nf_tables: fix ct untracked match breakage (2023-05-03 13:49:08 +0200)

----------------------------------------------------------------
netfilter pull request 23-05-03

----------------------------------------------------------------
Florian Westphal (1):
      netfilter: nf_tables: fix ct untracked match breakage

 net/netfilter/nft_ct_fast.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following patchset contains Netfilter fixes for net:

1) Fix syn-retransmits until initiator gives up when connection is re-used
   due to rst marked as invalid, from Florian Westphal.

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git

Thanks.

----------------------------------------------------------------

The following changes since commit 1f3bd64ad921f051254591fbed04fd30b306cde6:

  net: stmmac: fix invalid call to mdiobus_get_phy() (2023-01-17 13:33:19 +0100)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git HEAD

for you to fetch changes up to c410cb974f2ba562920ecb8492ee66945dcf88af:

  netfilter: conntrack: handle tcp challenge acks during connection reuse (2023-01-17 23:00:06 +0100)

----------------------------------------------------------------
Florian Westphal (1):
      netfilter: conntrack: handle tcp challenge acks during connection reuse

 net/netfilter/nf_conntrack_proto_tcp.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

[PATCH net 0/1] Netfilter fixes for net

[Pablo Neira Ayuso]

Hi,

The following patchset contains Netfilter fixes for net:

1) Fix syn-retransmits until initiator gives up when connection is re-used
   due to rst marked as invalid, from Florian Westphal.

Please, pull these changes from:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git

Thanks.

----------------------------------------------------------------

The following changes since commit 1f3bd64ad921f051254591fbed04fd30b306cde6:

  net: stmmac: fix invalid call to mdiobus_get_phy() (2023-01-17 13:33:19 +0100)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git HEAD

for you to fetch changes up to c410cb974f2ba562920ecb8492ee66945dcf88af:

  netfilter: conntrack: handle tcp challenge acks during connection reuse (2023-01-17 23:00:06 +0100)

----------------------------------------------------------------
Florian Westphal (1):
      netfilter: conntrack: handle tcp challenge acks during connection reuse

 net/netfilter/nf_conntrack_proto_tcp.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)