linux-kernel - Re: [syzbot] UBSAN: shift-out-of-bounds in xfrm_get

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Message-ID: <52d33ff4-5ddc-0103-9312-f75b7e7cb5b6@gmail.com>
Date:   Wed, 1 Sep 2021 21:56:19 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+b2be9dd8ca6f6c73ee2d@...kaller.appspotmail.com>,
        antony.antony@...unet.com, christian.langrock@...unet.com,
        davem@...emloft.net, herbert@...dor.apana.org.au, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] UBSAN: shift-out-of-bounds in xfrm_get_default

On 8/30/21 23:19, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    eaf2aaec0be4 Merge tag 'wireless-drivers-next-2021-08-29' ..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1219326d300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d2f9d4c9ff8c5ae7
> dashboard link: https://syzkaller.appspot.com/bug?extid=b2be9dd8ca6f6c73ee2d
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11e6e3a9300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10de8a6d300000
> 
> The issue was bisected to:
> 
> commit 2d151d39073aff498358543801fca0f670fea981
> Author: Steffen Klassert <steffen.klassert@...unet.com>
> Date:   Sun Jul 18 07:11:06 2021 +0000
> 
>      xfrm: Add possibility to set the default to block if we have no policy
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=114523fe300000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=134523fe300000
> console output: https://syzkaller.appspot.com/x/log.txt?x=154523fe300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+b2be9dd8ca6f6c73ee2d@...kaller.appspotmail.com
> Fixes: 2d151d39073a ("xfrm: Add possibility to set the default to block if we have no policy")
> 
> netlink: 172 bytes leftover after parsing attributes in process `syz-executor354'.
> ================================================================================
> UBSAN: shift-out-of-bounds in net/xfrm/xfrm_user.c:2010:49
> shift exponent 224 is too large for 32-bit type 'int'


#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git




With regards,
Pavel Skripkin
View attachment "0001-net-xfrm-fix-shift-out-of-bounds-in-xfrm_get_default.patch" of type "text/x-patch" (857 bytes)