[PATCH net 0/1] Netfilter fixes for net

[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(+)

[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 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 1/1] netfilter: nf_tables: unconditionally flush pending work before notifier

[Pablo Neira Ayuso]

From: Florian Westphal <fw@strlen.de>

syzbot reports:

KASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831
KASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530
KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597
Read of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45
[..]
Workqueue: events nf_tables_trans_destroy_work
Call Trace:
 nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline]
 nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline]
 nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597

Problem is that the notifier does a conditional flush, but its possible
that the table-to-be-removed is still referenced by transactions being
processed by the worker, so we need to flush unconditionally.

We could make the flush_work depend on whether we found a table to delete
in nf-next to avoid the flush for most cases.

AFAICS this problem is only exposed in nf-next, with
commit e169285f8c56 ("netfilter: nf_tables: do not store nft_ctx in transaction objects"),
with this commit applied there is an unconditional fetch of
table->family which is whats triggering the above splat.

Fixes: 2c9f0293280e ("netfilter: nf_tables: flush pending destroy work before netlink notifier")
Reported-and-tested-by: syzbot+4fd66a69358fc15ae2ad@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=4fd66a69358fc15ae2ad
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 net/netfilter/nf_tables_api.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index e8dcf41d360d..081c08536d0f 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -11483,8 +11483,7 @@ static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
 
 	gc_seq = nft_gc_seq_begin(nft_net);
 
-	if (!list_empty(&nf_tables_destroy_list))
-		nf_tables_trans_destroy_flush_work();
+	nf_tables_trans_destroy_flush_work();
 again:
 	list_for_each_entry(table, &nft_net->tables, list) {
 		if (nft_table_has_owner(table) &&
-- 
2.30.2

Re: [PATCH net 1/1] netfilter: nf_tables: unconditionally flush pending work before notifier

[Paolo Abeni]

Hi,

On Thu, 2024-07-04 at 00:33 +0200, Pablo Neira Ayuso wrote:
> From: Florian Westphal <fw@strlen.de>
> 
> syzbot reports:
> 
> KASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831
> KASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530
> KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597
> Read of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45
> [..]
> Workqueue: events nf_tables_trans_destroy_work
> Call Trace:
>  nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline]
>  nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline]
>  nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597
> 
> Problem is that the notifier does a conditional flush, but its possible
> that the table-to-be-removed is still referenced by transactions being
> processed by the worker, so we need to flush unconditionally.
> 
> We could make the flush_work depend on whether we found a table to delete
> in nf-next to avoid the flush for most cases.
> 
> AFAICS this problem is only exposed in nf-next, with
> commit e169285f8c56 ("netfilter: nf_tables: do not store nft_ctx in transaction objects"),
> with this commit applied there is an unconditional fetch of
> table->family which is whats triggering the above splat.
> 
> Fixes: 2c9f0293280e ("netfilter: nf_tables: flush pending destroy work before netlink notifier")
> Reported-and-tested-by: syzbot+4fd66a69358fc15ae2ad@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=4fd66a69358fc15ae2ad
> Signed-off-by: Florian Westphal <fw@strlen.de>
> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
> ---
>  net/netfilter/nf_tables_api.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> index e8dcf41d360d..081c08536d0f 100644
> --- a/net/netfilter/nf_tables_api.c
> +++ b/net/netfilter/nf_tables_api.c
> @@ -11483,8 +11483,7 @@ static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
>  
>  	gc_seq = nft_gc_seq_begin(nft_net);
>  
> -	if (!list_empty(&nf_tables_destroy_list))
> -		nf_tables_trans_destroy_flush_work();
> +	nf_tables_trans_destroy_flush_work();
>  again:
>  	list_for_each_entry(table, &nft_net->tables, list) {
>  		if (nft_table_has_owner(table) &&

It look like there is still some discussion around this patch, but I
guess we can still take it and in the worst case scenario a follow-up
will surface, right?

Thanks!

Paolo

Re: [PATCH net 1/1] netfilter: nf_tables: unconditionally flush pending work before notifier

[Pablo Neira Ayuso]

On Thu, Jul 04, 2024 at 03:24:17PM +0200, Paolo Abeni wrote:
> Hi,
> 
> On Thu, 2024-07-04 at 00:33 +0200, Pablo Neira Ayuso wrote:
> > From: Florian Westphal <fw@strlen.de>
> > 
> > syzbot reports:
> > 
> > KASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831
> > KASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530
> > KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597
> > Read of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45
> > [..]
> > Workqueue: events nf_tables_trans_destroy_work
> > Call Trace:
> >  nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline]
> >  nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline]
> >  nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597
> > 
> > Problem is that the notifier does a conditional flush, but its possible
> > that the table-to-be-removed is still referenced by transactions being
> > processed by the worker, so we need to flush unconditionally.
> > 
> > We could make the flush_work depend on whether we found a table to delete
> > in nf-next to avoid the flush for most cases.
> > 
> > AFAICS this problem is only exposed in nf-next, with
> > commit e169285f8c56 ("netfilter: nf_tables: do not store nft_ctx in transaction objects"),
> > with this commit applied there is an unconditional fetch of
> > table->family which is whats triggering the above splat.
> > 
> > Fixes: 2c9f0293280e ("netfilter: nf_tables: flush pending destroy work before netlink notifier")
> > Reported-and-tested-by: syzbot+4fd66a69358fc15ae2ad@syzkaller.appspotmail.com
> > Closes: https://syzkaller.appspot.com/bug?extid=4fd66a69358fc15ae2ad
> > Signed-off-by: Florian Westphal <fw@strlen.de>
> > Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
> > ---
> >  net/netfilter/nf_tables_api.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> > index e8dcf41d360d..081c08536d0f 100644
> > --- a/net/netfilter/nf_tables_api.c
> > +++ b/net/netfilter/nf_tables_api.c
> > @@ -11483,8 +11483,7 @@ static int nft_rcv_nl_event(struct notifier_block *this, unsigned long event,
> >  
> >  	gc_seq = nft_gc_seq_begin(nft_net);
> >  
> > -	if (!list_empty(&nf_tables_destroy_list))
> > -		nf_tables_trans_destroy_flush_work();
> > +	nf_tables_trans_destroy_flush_work();
> >  again:
> >  	list_for_each_entry(table, &nft_net->tables, list) {
> >  		if (nft_table_has_owner(table) &&
> 
> It look like there is still some discussion around this patch, but I
> guess we can still take it and in the worst case scenario a follow-up
> will surface, right?

Let's do that.

Thanks.

Re: [PATCH net 1/1] netfilter: nf_tables: unconditionally flush pending work before notifier

[patchwork-bot+netdevbpf]

Hello:

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

On Thu,  4 Jul 2024 00:33:04 +0200 you wrote:
> From: Florian Westphal <fw@strlen.de>
> 
> syzbot reports:
> 
> KASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831
> KASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530
> KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597
> Read of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45
> [..]
> Workqueue: events nf_tables_trans_destroy_work
> Call Trace:
>  nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline]
>  nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline]
>  nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597
> 
> [...]

Here is the summary with links:
  - [net,1/1] netfilter: nf_tables: unconditionally flush pending work before notifier
    https://git.kernel.org/netdev/net/c/9f6958ba2e90

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 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 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(+)

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 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 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 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(-)