Messages in this thread | | | Date | Mon, 11 Sep 2023 15:44:54 +0800 | From | Hangbin Liu <> | Subject | Re: [PATCH net v3] team: fix null-ptr-deref when team device type is changed |
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Hi Ziyang,
You patch status is Changes Requested[1]. I think you need to repost this patch.
[1] https://patchwork.kernel.org/project/netdevbpf/patch/20230905081056.3365013-1-william.xuanziyang@huawei.com/
Thanks Hangbin On Tue, Sep 05, 2023 at 04:10:56PM +0800, Ziyang Xuan wrote: > Get a null-ptr-deref bug as follows with reproducer [1]. > > BUG: kernel NULL pointer dereference, address: 0000000000000228 > ... > RIP: 0010:vlan_dev_hard_header+0x35/0x140 [8021q] > ... > Call Trace: > <TASK> > ? __die+0x24/0x70 > ? page_fault_oops+0x82/0x150 > ? exc_page_fault+0x69/0x150 > ? asm_exc_page_fault+0x26/0x30 > ? vlan_dev_hard_header+0x35/0x140 [8021q] > ? vlan_dev_hard_header+0x8e/0x140 [8021q] > neigh_connected_output+0xb2/0x100 > ip6_finish_output2+0x1cb/0x520 > ? nf_hook_slow+0x43/0xc0 > ? ip6_mtu+0x46/0x80 > ip6_finish_output+0x2a/0xb0 > mld_sendpack+0x18f/0x250 > mld_ifc_work+0x39/0x160 > process_one_work+0x1e6/0x3f0 > worker_thread+0x4d/0x2f0 > ? __pfx_worker_thread+0x10/0x10 > kthread+0xe5/0x120 > ? __pfx_kthread+0x10/0x10 > ret_from_fork+0x34/0x50 > ? __pfx_kthread+0x10/0x10 > ret_from_fork_asm+0x1b/0x30 > > [1] > $ teamd -t team0 -d -c '{"runner": {"name": "loadbalance"}}' > $ ip link add name t-dummy type dummy > $ ip link add link t-dummy name t-dummy.100 type vlan id 100 > $ ip link add name t-nlmon type nlmon > $ ip link set t-nlmon master team0 > $ ip link set t-nlmon nomaster > $ ip link set t-dummy up > $ ip link set team0 up > $ ip link set t-dummy.100 down > $ ip link set t-dummy.100 master team0 > > When enslave a vlan device to team device and team device type is changed > from non-ether to ether, header_ops of team device is changed to > vlan_header_ops. That is incorrect and will trigger null-ptr-deref > for vlan->real_dev in vlan_dev_hard_header() because team device is not > a vlan device. > > Assign eth_header_ops to header_ops of team device when its type is changed > from non-ether to ether to fix the bug. > > Fixes: 1d76efe1577b ("team: add support for non-ethernet devices") > Suggested-by: Hangbin Liu <liuhangbin@gmail.com> > Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> > --- > v3: > - Export eth_header_ops to fix modpost error. > v2: > - Just modify header_ops to eth_header_ops not use ether_setup(). > --- > drivers/net/team/team.c | 5 ++++- > net/ethernet/eth.c | 1 + > 2 files changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c > index d3dc22509ea5..12fb5f4cff06 100644 > --- a/drivers/net/team/team.c > +++ b/drivers/net/team/team.c > @@ -2127,7 +2127,10 @@ static const struct ethtool_ops team_ethtool_ops = { > static void team_setup_by_port(struct net_device *dev, > struct net_device *port_dev) > { > - dev->header_ops = port_dev->header_ops; > + if (port_dev->type == ARPHRD_ETHER) > + dev->header_ops = ð_header_ops; > + else > + dev->header_ops = port_dev->header_ops; > dev->type = port_dev->type; > dev->hard_header_len = port_dev->hard_header_len; > dev->needed_headroom = port_dev->needed_headroom; > diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c > index 2edc8b796a4e..157833509adb 100644 > --- a/net/ethernet/eth.c > +++ b/net/ethernet/eth.c > @@ -347,6 +347,7 @@ const struct header_ops eth_header_ops ____cacheline_aligned = { > .cache_update = eth_header_cache_update, > .parse_protocol = eth_header_parse_protocol, > }; > +EXPORT_SYMBOL(eth_header_ops); > > /** > * ether_setup - setup Ethernet network device > -- > 2.25.1 >
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