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From: "Péter Ujfalusi" <peter.ujfalusi@linux.intel.com>
To: Sergey Senozhatsky <senozhatsky@chromium.org>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: alsa-devel@alsa-project.org,
	Kai Vehmanen <kai.vehmanen@linux.intel.com>,
	linux-kernel@vger.kernel.org,
	Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
	Takashi Iwai <tiwai@suse.com>,
	Liam Girdwood <liam.r.girdwood@linux.intel.com>,
	Mark Brown <broonie@kernel.org>,
	Ricardo Ribalda <ribalda@chromium.org>,
	Tomasz Figa <tfiga@chromium.org>,
	Jaska Uimonen <jaska.uimonen@linux.intel.com>,
	sound-open-firmware@alsa-project.org
Subject: Re: out-of-bounds access in sound/soc/sof/topology.c
Date: Wed, 27 Apr 2022 10:26:28 +0300	[thread overview]
Message-ID: <e349e9ca-7a4f-8d65-3ade-5ac4dfd5700a@linux.intel.com> (raw)
In-Reply-To: <Ymjo1aHD4V6bNHz7@google.com>



On 27/04/2022 09:55, Sergey Senozhatsky wrote:
> On (22/04/19 08:07), Pierre-Louis Bossart wrote:
>>> Your analyzes are spot on, unfortunately. But...
>>>
>>> As of today, the sof_get_control_data() is in the call path of
>>> (ipc3-topology.c):
>>>
>>> sof_widget_update_ipc_comp_process() -> sof_process_load() ->
>>> sof_get_control_data()
>>>
>>> sof_widget_update_ipc_comp_process() is the ipc_setup callback for
>>> snd_soc_dapm_effect. If I'm not mistaken these only carries bin payload
>>> and never MIXER/ENUM/SWITCH/VOLUME.
>>> This means that the sof_get_control_data() is only called with
>>> SND_SOC_TPLG_TYPE_BYTES and for that the allocated data area is correct.
>>>
>>> This can explain why we have not seen any issues so far. This does not
>>> renders the code right, as how it is written atm is wrong.
>>
>>
>> Sergey's results with KASAN show that there's a real-life problem though. I also don't understand how that might happen.
>>
>> Could it be that these results are with a specific topology where our assumptions are incorrect?
> 
> Is there anything I can do to help?

I will send a patch shortly, I think it is going to be easy to backport
for you and test it.

-- 
Péter

WARNING: multiple messages have this Message-ID
From: "Péter Ujfalusi" <peter.ujfalusi@linux.intel.com>
To: Sergey Senozhatsky <senozhatsky@chromium.org>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: alsa-devel@alsa-project.org,
	Kai Vehmanen <kai.vehmanen@linux.intel.com>,
	Takashi Iwai <tiwai@suse.com>,
	linux-kernel@vger.kernel.org,
	Liam Girdwood <liam.r.girdwood@linux.intel.com>,
	Mark Brown <broonie@kernel.org>,
	Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
	Ricardo Ribalda <ribalda@chromium.org>,
	Tomasz Figa <tfiga@chromium.org>,
	Jaska Uimonen <jaska.uimonen@linux.intel.com>,
	sound-open-firmware@alsa-project.org
Subject: Re: out-of-bounds access in sound/soc/sof/topology.c
Date: Wed, 27 Apr 2022 10:26:28 +0300	[thread overview]
Message-ID: <e349e9ca-7a4f-8d65-3ade-5ac4dfd5700a@linux.intel.com> (raw)
In-Reply-To: <Ymjo1aHD4V6bNHz7@google.com>



On 27/04/2022 09:55, Sergey Senozhatsky wrote:
> On (22/04/19 08:07), Pierre-Louis Bossart wrote:
>>> Your analyzes are spot on, unfortunately. But...
>>>
>>> As of today, the sof_get_control_data() is in the call path of
>>> (ipc3-topology.c):
>>>
>>> sof_widget_update_ipc_comp_process() -> sof_process_load() ->
>>> sof_get_control_data()
>>>
>>> sof_widget_update_ipc_comp_process() is the ipc_setup callback for
>>> snd_soc_dapm_effect. If I'm not mistaken these only carries bin payload
>>> and never MIXER/ENUM/SWITCH/VOLUME.
>>> This means that the sof_get_control_data() is only called with
>>> SND_SOC_TPLG_TYPE_BYTES and for that the allocated data area is correct.
>>>
>>> This can explain why we have not seen any issues so far. This does not
>>> renders the code right, as how it is written atm is wrong.
>>
>>
>> Sergey's results with KASAN show that there's a real-life problem though. I also don't understand how that might happen.
>>
>> Could it be that these results are with a specific topology where our assumptions are incorrect?
> 
> Is there anything I can do to help?

I will send a patch shortly, I think it is going to be easy to backport
for you and test it.

-- 
Péter

  reply	other threads:[~2022-04-27  7:26 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-15  9:23 out-of-bounds access in sound/soc/sof/topology.c Sergey Senozhatsky
2022-04-15  9:23 ` Sergey Senozhatsky
2022-04-15 16:00 ` Pierre-Louis Bossart
2022-04-15 16:00   ` Pierre-Louis Bossart
2022-04-16  1:05   ` Sergey Senozhatsky
2022-04-16  1:05     ` Sergey Senozhatsky
2022-04-19 11:50   ` Péter Ujfalusi
2022-04-19 11:50     ` Péter Ujfalusi
2022-04-19 13:07     ` Pierre-Louis Bossart
2022-04-19 13:07       ` Pierre-Louis Bossart
2022-04-19 18:04       ` [Sound-open-firmware] " Curtis Malainey
2022-04-19 18:04         ` Curtis Malainey
2022-04-27  6:55       ` Sergey Senozhatsky
2022-04-27  6:55         ` Sergey Senozhatsky
2022-04-27  7:26         ` Péter Ujfalusi [this message]
2022-04-27  7:26           ` Péter Ujfalusi
2022-04-19  1:59 ` [Sound-open-firmware] " Curtis Malainey
2022-04-19  1:59   ` Curtis Malainey

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