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Date:   Tue, 27 Sep 2022 18:34:59 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
Cc:     Networking <netdev@...r.kernel.org>, joannelkoong@...il.com,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: Use of uninit value in inet_bind2_bucket_find

On Tue, Sep 27, 2022 at 2:33 AM Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>
> On 9/19/22 6:41 AM, Alexander Potapenko wrote:
> > Hi Joanne, Jakub et al.,
> >
> > When building next-20220919 with KMSAN I am seeing the following error
> > at boot time:
> >
> > =====================================================
> > BUG: KMSAN: uninit-value in inet_bind2_bucket_find+0x71f/0x790
> > net/ipv4/inet_hashtables.c:827
> >   inet_bind2_bucket_find+0x71f/0x790 net/ipv4/inet_hashtables.c:827
> >   inet_csk_get_port+0x2415/0x32e0 net/ipv4/inet_connection_sock.c:529
> >   __inet6_bind+0x1474/0x1a20 net/ipv6/af_inet6.c:406
> >   inet6_bind+0x176/0x360 net/ipv6/af_inet6.c:465
> >   __sys_bind+0x5b3/0x750 net/socket.c:1776
> >   __do_sys_bind net/socket.c:1787
> >   __se_sys_bind net/socket.c:1785
> >   __x64_sys_bind+0x8d/0xe0 net/socket.c:1785
> >   do_syscall_x64 arch/x86/entry/common.c:50
> >   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
> >   entry_SYSCALL_64_after_hwframe+0x63/0xcd ??:?
> >
> > Uninit was created at:
> >   slab_post_alloc_hook+0x156/0xb40 mm/slab.h:759
> >   slab_alloc_node mm/slub.c:3331
> >   slab_alloc mm/slub.c:3339
> >   __kmem_cache_alloc_lru mm/slub.c:3346
> >   kmem_cache_alloc+0x47e/0x9f0 mm/slub.c:3355
> >   inet_bind2_bucket_create+0x4b/0x3b0 net/ipv4/inet_hashtables.c:128
> >   inet_csk_get_port+0x2513/0x32e0 net/ipv4/inet_connection_sock.c:533
> >   __inet_bind+0xbd2/0x1040 net/ipv4/af_inet.c:525
> >   inet_bind+0x184/0x360 net/ipv4/af_inet.c:456
> >   __sys_bind+0x5b3/0x750 net/socket.c:1776
> >   __do_sys_bind net/socket.c:1787
> >   __se_sys_bind net/socket.c:1785
> >   __x64_sys_bind+0x8d/0xe0 net/socket.c:1785
> >   do_syscall_x64 arch/x86/entry/common.c:50
> >   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
> >   entry_SYSCALL_64_after_hwframe+0x63/0xcd ??:?
> >
> > CPU: 3 PID: 5983 Comm: sshd Not tainted 6.0.0-rc6-next-20220919 #211
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> > 1.16.0-debian-1.16.0-4 04/01/2014
> > =====================================================
> >
> > I think this is related to "net: Add a bhash2 table hashed by port and
> > address", could you please take a look?
> > This error is not reported on v6.0-rc5 (note that KMSAN only exists in
> > -next and as a v6.0-rc5 fork at https://github.com/google/kmsan).
>
> Hi Alex, thanks for the report.
>
> I have posted a fix [0].  I have problem getting kmsan kernel to boot.
> Could you help to give the patch a try ?  Thanks.
>
> [0]: https://lore.kernel.org/netdev/20220927002544.3381205-1-kafai@fb.com/

Hi Martin,

Thanks, I'll give it a shot.

Could you please share the config you're using to build KMSAN? I am
really curious about what's wrong.

-- 
Alexander Potapenko
Software Engineer

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