linux-kernel - Re: KMSAN: kernel-infoleak in move_addr_to

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Date:   Tue, 12 Jan 2021 10:12:02 +0100
From:   Oliver Hartkopp <socketcan@...tkopp.net>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     syzbot <syzbot+057884e2f453e8afebc8@...kaller.appspotmail.com>,
        Robin van der Gracht <robin@...tonic.nl>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-can@...r.kernel.org, David Miller <davem@...emloft.net>,
        Alexander Potapenko <glider@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KMSAN: kernel-infoleak in move_addr_to_user (4)



On 12.01.21 01:17, Cong Wang wrote:
> On Mon, Jan 11, 2021 at 11:33 AM Jakub Kicinski <kuba@...nel.org> wrote:
>>
>> Looks like a AF_CAN socket:
>>
>> r0 = socket(0x1d, 0x2, 0x6)
>> getsockname$packet(r0, &(0x7f0000000100)={0x11, 0x0, 0x0, 0x1, 0x0, 0x6, @broadcast}, &(0x7f0000000000)=0x14)
>>
> 
> Right, it seems we need a memset(0) in isotp_getname().

Yes m(

Sent a patch to fix it:

https://lore.kernel.org/linux-can/20210112090457.11262-1-socketcan@hartkopp.net/T/#u

Many thanks!

Oliver