linux-kernel - Re: UBSAN: shift-out-of-bounds in xprt_do

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Date:   Wed, 10 Feb 2021 16:52:18 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     syzbot <syzbot+f3a0fa110fd630ab56c8@...kaller.appspotmail.com>,
        anna.schumaker@...app.com, bfields@...ldses.org,
        chuck.lever@...cle.com, davem@...emloft.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        trond.myklebust@...merspace.com
Subject: Re: UBSAN: shift-out-of-bounds in xprt_do_reserve

On 2/9/21 5:24 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    dd86e7fa Merge tag 'pci-v5.11-fixes-2' of git://git.kernel..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=105930c4d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=266a5362c89c8127
> dashboard link: https://syzkaller.appspot.com/bug?extid=f3a0fa110fd630ab56c8
> compiler:       Debian clang version 11.0.1-2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ba3038d00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15cf0d64d00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+f3a0fa110fd630ab56c8@...kaller.appspotmail.com

#syz dup: UBSAN: shift-out-of-bounds in xprt_calc_majortimeo

> ================================================================================
> UBSAN: shift-out-of-bounds in net/sunrpc/xprt.c:658:14
> shift exponent 536870976 is too large for 64-bit type 'unsigned long'
> CPU: 1 PID: 8411 Comm: syz-executor902 Not tainted 5.11.0-rc6-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:79 [inline]
>  dump_stack+0x137/0x1be lib/dump_stack.c:120
>  ubsan_epilogue lib/ubsan.c:148 [inline]
>  __ubsan_handle_shift_out_of_bounds+0x432/0x4d0 lib/ubsan.c:395
>  xprt_calc_majortimeo net/sunrpc/xprt.c:658 [inline]
>  xprt_init_majortimeo net/sunrpc/xprt.c:686 [inline]


-- 
~Randy