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Date:   Mon, 11 Nov 2019 17:09:50 +0100
From:   Greg KH <greg@kroah.com>
To:     syzbot <syzbot+d934a9036346e0215d8f@syzkaller.appspotmail.com>
Cc:     andreyknvl@google.com, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: BUG: bad host security descriptor; not enough data (4 vs 5 left)
Message-ID: <20191111160950.GA870254@kroah.com>
References: <000000000000d9a391059713dc1f@google.com>
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On Mon, Nov 11, 2019 at 07:34:08AM -0800, syzbot wrote:
> Hello,
>=20
> syzbot found the following crash on:
>=20
> HEAD commit:    3183c037 usb: gadget: add raw-gadget interface
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=3D12525dc6e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3D79de80330003b=
5f7
> dashboard link: https://syzkaller.appspot.com/bug?extid=3Dd934a9036346e02=
15d8f
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D14ac7406e00=
000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=3D13eea39ae00000
>=20
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+d934a9036346e0215d8f@syzkaller.appspotmail.com
>=20
> usb 1-1: config 0 interface 0 altsetting 0 has 3 endpoint descriptors,
> different from the interface descriptor's value: 4
> usb 1-1: New USB device found, idVendor=3D13dc, idProduct=3D5611,
> bcdDevice=3D2f.15
> usb 1-1: New USB device strings: Mfr=3D0, Product=3D0, SerialNumber=3D0
> usb 1-1: config 0 descriptor??
> hwa-hc 1-1:0.0: Wire Adapter v106.52 newer than groked v1.0
> hwa-hc 1-1:0.0: FIXME: USB_MAXCHILDREN too low for WUSB adapter (194 port=
s)
> usb 1-1: BUG: bad host security descriptor; not enough data (4 vs 5 left)
> usb 1-1: supported encryption types: =EF=BF=BDS=03=D0=81=EF=BF=BD=EF=BF=
=BD=EF=BF=BD|c=03=D0=81=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BDc=03=D0=81=EF=BF=
=BD=EF=BF=BD=EF=BF=BD
> usb 1-1: E: host doesn't support CCM-1 crypto
> hwa-hc 1-1:0.0: Wireless USB HWA host controller
> hwa-hc 1-1:0.0: new USB bus registered, assigned bus number 11

wusb code, hah.  It's about to be deleted from the kernel because no one
uses it and there is no hardware out there.  I wouldn't spend a ton of
time fuzzing it.

One more good reason to just delete it soon...

thanks,

greg k-h