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To:     Julia Lawall <julia.lawall@inria.fr>
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References: <20200615130242.11825-1-efremov@linux.com>
 <alpine.DEB.2.22.394.2006172225570.3083@hadrien>
From:   Denis Efremov <efremov@linux.com>
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Subject: Re: [Cocci] [PATCH] coccinelle: api: add device_attr_show script
Message-ID: <871aeea8-9b61-5eaa-4b0d-a377ba82c2d0@linux.com>
Date:   Wed, 17 Jun 2020 23:41:28 +0300
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On 6/17/20 11:27 PM, Julia Lawall wrote:
> 
> 
> On Mon, 15 Jun 2020, Denis Efremov wrote:
> 
>> According to the documentation[1] show() methods of device attributes
>> should return the number of bytes printed into the buffer. This is
>> the return value of scnprintf(). show() must not use snprintf()
>> when formatting the value to be returned to user space. snprintf()
>> returns the length the resulting string would be, assuming it all
>> fit into the destination array[2]. scnprintf() return the length of
>> the string actually created in buf. If one can guarantee that an
>> overflow will never happen sprintf() can be used otherwise scnprintf().
> 
> The semantic patch looks fine.  Do you have any accepted patches from
> this?

It's not my patches, but:

3f9f8daad342 cpuidle: sysfs: Fix the overlap for showing available governors
117e2cb3eeee sparc: use scnprintf() in show_pciobppath_attr() in vio.c
03a1b56f501e sparc: use scnprintf() in show_pciobppath_attr() in pci.c
3dee04262898 iio: tsl2772: Use scnprintf() for avoiding potential buffer overflow
dbdd24eaac4e edd: Use scnprintf() for avoiding potential buffer overflow
abdd9feb45ed btrfs: sysfs: Use scnprintf() instead of snprintf()
f21431f2de33 thermal: int340x_thermal: Use scnprintf() for avoiding potential buffer overflow
40501c70e3f0 s390/zcrypt: replace snprintf/sprintf with scnprintf
eb3e064b8dd1 s390/zcrypt: Use scnprintf() for avoiding potential buffer overflow
06b522d6de9d video: uvesafb: Use scnprintf() for avoiding potential buffer overflow
bf1b615ad97e video: omapfb: Use scnprintf() for avoiding potential buffer overflow
b40e288bfb53 platform/x86: sony-laptop: Use scnprintf() for avoiding potential buffer overflow
ef21e1750158 ALSA: Use scnprintf() instead of snprintf() for show

and many more

Thanks,
Denis