Re: [PATCH] ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network

patchwork-bot+netdevbpf
2022-11-07T12:31:29Z

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Fri, 4 Nov 2022 11:32:16 +0100 you wrote:
> When copying a `struct ifaddrlblmsg` to the network, __ifal_reserved
> remained uninitialized, resulting in a 1-byte infoleak:
>
> BUG: KMSAN: kernel-network-infoleak in __netdev_start_xmit ./include/linux/netdevice.h:4841
> __netdev_start_xmit ./include/linux/netdevice.h:4841
> netdev_start_xmit ./include/linux/netdevice.h:4857
> xmit_one net/core/dev.c:3590
> dev_hard_start_xmit+0x1dc/0x800 net/core/dev.c:3606
> __dev_queue_xmit+0x17e8/0x4350 net/core/dev.c:4256
> dev_queue_xmit ./include/linux/netdevice.h:3009
> __netlink_deliver_tap_skb net/netlink/af_netlink.c:307
> __netlink_deliver_tap+0x728/0xad0 net/netlink/af_netlink.c:325
> netlink_deliver_tap net/netlink/af_netlink.c:338
> __netlink_sendskb net/netlink/af_netlink.c:1263
> netlink_sendskb+0x1d9/0x200 net/netlink/af_netlink.c:1272
> netlink_unicast+0x56d/0xf50 net/netlink/af_netlink.c:1360
> nlmsg_unicast ./include/net/netlink.h:1061
> rtnl_unicast+0x5a/0x80 net/core/rtnetlink.c:758
> ip6addrlbl_get+0xfad/0x10f0 net/ipv6/addrlabel.c:628
> rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082
> ...
> Uninit was created at:
> slab_post_alloc_hook+0x118/0xb00 mm/slab.h:742
> slab_alloc_node mm/slub.c:3398
> __kmem_cache_alloc_node+0x4f2/0x930 mm/slub.c:3437
> __do_kmalloc_node mm/slab_common.c:954
> __kmalloc_node_track_caller+0x117/0x3d0 mm/slab_common.c:975
> kmalloc_reserve net/core/skbuff.c:437
> __alloc_skb+0x27a/0xab0 net/core/skbuff.c:509
> alloc_skb ./include/linux/skbuff.h:1267
> nlmsg_new ./include/net/netlink.h:964
> ip6addrlbl_get+0x490/0x10f0 net/ipv6/addrlabel.c:608
> rtnetlink_rcv_msg+0xb33/0x1570 net/core/rtnetlink.c:6082
> netlink_rcv_skb+0x299/0x550 net/netlink/af_netlink.c:2540
> rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6109
> netlink_unicast_kernel net/netlink/af_netlink.c:1319
> netlink_unicast+0x9ab/0xf50 net/netlink/af_netlink.c:1345
> netlink_sendmsg+0xebc/0x10f0 net/netlink/af_netlink.c:1921
> ...
>
> [...]

Here is the summary with links:
- ipv6: addrlabel: fix infoleak when sending struct ifaddrlblmsg to network
https://git.kernel.org/netdev/net/c/c23fb2c82267

You are awesome, thank you!
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