linux-kernel - Re: KMSAN: uninit-value in get_term

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAG_fn=VLxj9xKd_Wxm0cA1Lo7E6YG4SBsZ9EFnFj94TbE-6aPg@mail.gmail.com>
Date:   Mon, 28 Oct 2019 14:17:48 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     syzbot <syzbot+8f2612936028bfd28f28@...kaller.appspotmail.com>,
        allison@...utok.net, alsa-devel@...a-project.org,
        benquike@...il.com, dan.carpenter@...cle.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>, perex@...ex.cz,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Takashi Iwai <tiwai@...e.com>, wang6495@....edu,
        yuehaibing@...wei.com
Subject: Re: KMSAN: uninit-value in get_term_name

On Mon, Oct 28, 2019 at 2:13 PM Takashi Iwai <tiwai@...e.de> wrote:
>
> On Mon, 28 Oct 2019 11:32:07 +0100,
> syzbot wrote:
> >
> > Uninit was stored to memory at:
> >  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline]
> >  kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319
> >  __msan_chain_origin+0x6b/0xd0 mm/kmsan/kmsan_instr.c:179
> >  parse_term_proc_unit+0x73d/0x7e0 sound/usb/mixer.c:896
> >  __check_input_term+0x13ef/0x2360 sound/usb/mixer.c:989
>
> So this comes from the invalid descriptor for a processing unit, and
> it's very likely the same issue as already spotted -- the validator up
> to 5.3-rc4 had a bug that passed the invalid descriptor falsely.
> This should have been covered by 5.3-rc5, commit ba8bf0967a15 ("ALSA:
> usb-audio: Fix copy&paste error in the validator").
Ah, thanks. Looks like I need to rebase the KMSAN tree.
>
> thanks,
>
> Takashi



-- 
Alexander Potapenko
Software Engineer

Google Germany GmbH
Erika-Mann-Straße, 33
80636 München

Geschäftsführer: Paul Manicle, Halimah DeLaine Prado
Registergericht und -nummer: Hamburg, HRB 86891
Sitz der Gesellschaft: Hamburg