linux-kernel - Re: [PATCH] watchdog: Use sysfs_emit() and sysfs_emit

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Date:   Thu, 20 May 2021 08:30:52 +0200
From:   Juerg Haefliger <juerg.haefliger@...onical.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Juerg Haefliger <juerg.haefliger@...onical.com>,
        wim@...ux-watchdog.org, linux@...ck-us.net, joel@....id.au,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, andrew@...id.au,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: Use sysfs_emit() and sysfs_emit_at() in
 "show" functions

On Wed, 12 May 2021 21:48:37 -0700
Joe Perches <joe@...ches.com> wrote:

> On Tue, 2021-05-11 at 08:18 +0200, Juerg Haefliger wrote:
> > Convert sprintf() in sysfs "show" functions to sysfs_emit() and
> > sysfs_emit_at() in order to check for buffer overruns in sysfs outputs.  
> []
> > diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c  
> []
> > @@ -445,8 +445,9 @@ static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev,
> >  	if (ret)
> >  		return ret;
> >  
> > 
> > -	ret = sprintf(buf, ZIIRAVE_FW_VERSION_FMT, w_priv->firmware_rev.major,
> > -		      w_priv->firmware_rev.minor);
> > +	ret = sysfs_emit(buf, ZIIRAVE_FW_VERSION_FMT,
> > +			 w_priv->firmware_rev.major,
> > +			 w_priv->firmware_rev.minor);
> >  
> > 
> >  	mutex_unlock(&w_priv->sysfs_mutex);
> >  
> > 
> > @@ -468,8 +469,9 @@ static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev,
> >  	if (ret)
> >  		return ret;
> >  
> > 
> > -	ret = sprintf(buf, ZIIRAVE_BL_VERSION_FMT, w_priv->bootloader_rev.major,
> > -		      w_priv->bootloader_rev.minor);
> > +	ret = sysfs_emit(buf, ZIIRAVE_BL_VERSION_FMT,
> > +			 w_priv->bootloader_rev.major,
> > +			 w_priv->bootloader_rev.minor);
> >  
> > 
> >  	mutex_unlock(&w_priv->sysfs_mutex);
> >  
> > 
> > @@ -491,7 +493,7 @@ static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev,
> >  	if (ret)
> >  		return ret;
> >  
> > 
> > -	ret = sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);
> > +	ret = sysfs_emit(buf, "%s", ziirave_reasons[w_priv->reset_reason]);  
> 
> All of these formats should probably end with a newline
> and the ZIIRAVE_<FOO>_VERSION_FMT defines are to me unnecessary.
> 

I'll send a follow-on patch for that.

...Juerg

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