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SubjectRe: KMSAN: kernel-usb-infoleak in pcan_usb_pro_send_req
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.

>
> Alan Stern
>

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