linux-kernel - Re: [syzbot] KMSAN: kernel-usb-infoleak in usbnet_write

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Date:   Fri, 7 Jan 2022 01:17:41 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+003c0a286b9af5412510@...kaller.appspotmail.com>,
        glider@...gle.com, gregkh@...uxfoundation.org, johan@...nel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        stern@...land.harvard.edu, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KMSAN: kernel-usb-infoleak in usbnet_write_cmd (3)

On 1/5/22 21:28, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    81c325bbf94e kmsan: hooks: do not check memory in kmsan_in..
> git tree:       https://github.com/google/kmsan.git master
> console output: https://syzkaller.appspot.com/x/log.txt?x=14a07163b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2d8b9a11641dc9aa
> dashboard link: https://syzkaller.appspot.com/bug?extid=003c0a286b9af5412510
> compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=100165dbb00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10c97e77b00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+003c0a286b9af5412510@...kaller.appspotmail.com
> 

Heh, I think, more reports like this will appear soon. Syzbot learned 
how to tweak usb read functions return values, I guess?

#syz test: https://github.com/google/kmsan.git master



With regards,
Pavel Skripkin
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