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Message-ID: <202410281645.5FFC8E6E@keescook>
Date: Mon, 28 Oct 2024 16:45:35 -0700
From: Kees Cook <kees@...nel.org>
To: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: Aleksei Vetrov <vvvvvv@...gle.com>, Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ASoC: dapm: fix bounds checker error in
dapm_widget_list_create
On Mon, Oct 28, 2024 at 04:58:58PM -0600, Gustavo A. R. Silva wrote:
>
>
> On 28/10/24 16:50, Aleksei Vetrov wrote:
> > The widgets array in the snd_soc_dapm_widget_list has a __counted_by
> > attribute attached to it, which points to the num_widgets variable. This
> > attribute is used in bounds checking, and if it is not set before the
> > array is filled, then the bounds sanitizer will issue a warning or a
> > kernel panic if CONFIG_UBSAN_TRAP is set.
> >
> > This patch sets the size of the widgets list calculated with
> > list_for_each as the initial value for num_widgets as it is used for
> > allocating memory for the array. It is updated with the actual number of
> > added elements after the array is filled.
>
> As in the previous patch, this should include the following tag
> (and probably CC stable):
>
> Fixes: 80e698e2df5b ("ASoC: soc-dapm: Annotate struct snd_soc_dapm_widget_list with __counted_by")
Whoops! My mistake. :) Thanks for catching this one!
Reviewed-by: Kees Cook <kees@...nel.org>
-Kees
>
> Thanks
> --
> Gustavo
>
> >
> > Signed-off-by: Aleksei Vetrov <vvvvvv@...gle.com>
> > ---
> > sound/soc/soc-dapm.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
> > index c34934c31ffec3970b34b24dcaa0826dfb7d8e86..99521c784a9b16a232a558029a2f3e88bd8ebfb1 100644
> > --- a/sound/soc/soc-dapm.c
> > +++ b/sound/soc/soc-dapm.c
> > @@ -1147,6 +1147,8 @@ static int dapm_widget_list_create(struct snd_soc_dapm_widget_list **list,
> > if (*list == NULL)
> > return -ENOMEM;
> > + (*list)->num_widgets = size;
> > +
> > list_for_each_entry(w, widgets, work_list)
> > (*list)->widgets[i++] = w;
> >
> > ---
> > base-commit: 81983758430957d9a5cb3333fe324fd70cf63e7e
> > change-id: 20241028-soc-dapm-bounds-checker-fix-5bae621455b2
> >
> > Best regards,
>
>
--
Kees Cook
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