From: Andrey Konovalov <andreyknvl@google.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: syzbot <syzbot+513e4d0985298538bf9b@syzkaller.appspotmail.com>,
Alexander Potapenko <glider@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
Kernel development list <linux-kernel@vger.kernel.org>,
USB list <linux-usb@vger.kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: KMSAN: kernel-usb-infoleak in pcan_usb_pro_send_req
Date: Tue, 30 Jul 2019 16:22:07 +0200 [thread overview]
Message-ID: <CAAeHK+z50rsvQypF5AivYJh0wQ04XAueC=Ms2cPt3+QuN1+KGg@mail.gmail.com> (raw)
In-Reply-To: <CAAeHK+wnhfMvoMbuv3Oco1eH35BL5tdR9-X5erEJmKLS1finAg@mail.gmail.com>
On Tue, Jul 30, 2019 at 4:20 PM Andrey Konovalov <andreyknvl@google.com> wrote:
>
> On Tue, Jul 30, 2019 at 4:17 PM Alan Stern <stern@rowland.harvard.edu> wrote:
> >
> > 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@syzkaller.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?
>
> That means that the kernel put some uninitialized data into a request
> that was sent to a USB device.
Here's a better report for this bug:
https://syzkaller.appspot.com/text?tag=CrashReport&x=11dae8ec600000
This is a real bug, I was able to reproduce it with a hardware
reproducer and leak some kernel pointers AFAIR.
>
> >
> > Alan Stern
> >
next prev parent reply other threads:[~2019-07-30 14:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 9:38 KMSAN: kernel-usb-infoleak in pcan_usb_pro_send_req syzbot
2019-07-30 14:17 ` Alan Stern
2019-07-30 14:20 ` Andrey Konovalov
2019-07-30 14:22 ` Andrey Konovalov [this message]
2019-07-30 14:28 ` Alexander Potapenko
2019-08-06 12:45 ` Oliver Neukum
2019-08-06 12:45 ` syzbot
2019-08-06 12:49 ` Andrey Konovalov
2019-08-06 13:59 ` Alan Stern
2019-08-06 14:00 ` Andrey Konovalov
2019-08-06 13:05 ` Oliver Neukum
2019-08-06 14:44 ` syzbot
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