On Tue, Jul 30, 2019 at 4:20 PM Andrey Konovalov <andreyknvl@xxxxxxxxxx> wrote: > > On Tue, Jul 30, 2019 at 4:17 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > > > 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 > >
