linux-kernel - Re: [PATCH -next] ALSA: pcm: fix undefined behavior in bit shift for SNDRV_PCM_RATE

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Date:   Mon, 21 Nov 2022 18:47:27 +0800
From:   zhongbaisong <zhongbaisong@...wei.com>
To:     Takashi Iwai <tiwai@...e.de>
CC:     <linux-kernel@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <perex@...ex.cz>, <tiwai@...e.com>, <broonie@...nel.org>,
        <kuninori.morimoto.gx@...esas.com>
Subject: Re: [PATCH -next] ALSA: pcm: fix undefined behavior in bit shift for
 SNDRV_PCM_RATE_KNOT



在 2022/11/21 18:35, Takashi Iwai 写道:
> On Mon, 21 Nov 2022 03:33:29 +0100,
> Baisong Zhong wrote:
>>
>> Shifting signed 32-bit value by 31 bits is undefined, so changing
>> significant bit to unsigned. The UBSAN warning calltrace like below:
>>
>> UBSAN: shift-out-of-bounds in sound/core/pcm_native.c:2676:21
>> left shift of 1 by 31 places cannot be represented in type 'int'
>> ...
>> Call Trace:
>>   <TASK>
>>   dump_stack_lvl+0x8d/0xcf
>>   ubsan_epilogue+0xa/0x44
>>   __ubsan_handle_shift_out_of_bounds+0x1e7/0x208
>>   snd_pcm_open_substream+0x9f0/0xa90
>>   snd_pcm_oss_open.part.26+0x313/0x670
>>   snd_pcm_oss_open+0x30/0x40
>>   soundcore_open+0x18b/0x2e0
>>   chrdev_open+0xe2/0x270
>>   do_dentry_open+0x2f7/0x620
>>   path_openat+0xd66/0xe70
>>   do_filp_open+0xe3/0x170
>>   do_sys_openat2+0x357/0x4a0
>>   do_sys_open+0x87/0xd0
>>   do_syscall_64+0x34/0x80
>>
>> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
>> Signed-off-by: Baisong Zhong <zhongbaisong@...wei.com>
>> ---
>>   include/sound/pcm.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/sound/pcm.h b/include/sound/pcm.h
>> index 7b1a022910e8..ec28c2ec89de 100644
>> --- a/include/sound/pcm.h
>> +++ b/include/sound/pcm.h
>> @@ -123,7 +123,7 @@ struct snd_pcm_ops {
>>   #define SNDRV_PCM_RATE_384000		(1<<14)		/* 384000Hz */
>>   
>>   #define SNDRV_PCM_RATE_CONTINUOUS	(1<<30)		/* continuous range */
>> -#define SNDRV_PCM_RATE_KNOT		(1<<31)		/* supports more non-continuos rates */
>> +#define SNDRV_PCM_RATE_KNOT		(1U<<31)	/* supports more non-continuos rates */
> 
> Could you rather update all SNDRV_PCM_RATE_* to 1U?
> Otherwise it'll look inconsistent.
> 
> 
> thanks,
> 
> Takashi

Hi, Takashi
Thank you for your suggestion. I will update all
SNDRV_PCM_RATE_* to 1U for consistency in v2.

Baisong Zhong
.