linux-kernel - Re: KMSAN: kernel-usb-infoleak in pcan_usb_pro_send

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Message-ID: <Pine.LNX.4.44L0.1907301011100.1507-100000@iolanthe.rowland.org>
Date:   Tue, 30 Jul 2019 10:17:19 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     andreyknvl@...gle.com,
        syzbot <syzbot+513e4d0985298538bf9b@...kaller.appspotmail.com>
cc:     glider@...gle.com, <gregkh@...uxfoundation.org>,
        <gustavo@...eddedor.com>,
        Kernel development list <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        <syzkaller-bugs@...glegroups.com>
Subject: Re: KMSAN: kernel-usb-infoleak in pcan_usb_pro_send_req

On Tue, 30 Jul 2019, syzbot wrote:

> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    41550654 [UPSTREAM] KVM: x86: degrade WARN to pr_warn_rate..
> git tree:       kmsan
> console output: https://syzkaller.appspot.com/x/log.txt?x=13e95183a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=40511ad0c5945201
> dashboard link: https://syzkaller.appspot.com/bug?extid=513e4d0985298538bf9b
> compiler:       clang version 9.0.0 (/home/glider/llvm/clang  
> 80fee25776c2fb61e74c1ecb1a523375c2500b69)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17eafa1ba00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17b87983a00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+513e4d0985298538bf9b@...kaller.appspotmail.com
> 
> usb 1-1: config 0 has no interface number 0
> usb 1-1: New USB device found, idVendor=0c72, idProduct=0014,  
> bcdDevice=8b.53
> usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> usb 1-1: config 0 descriptor??
> peak_usb 1-1:0.146: PEAK-System PCAN-USB X6 v0 fw v0.0.0 (2 channels)
> ==================================================================
> BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x7ef/0x1f50  
> drivers/usb/core/urb.c:405

What does "kernel-usb-infoleak" mean?

Alan Stern