linux-kernel - Re: [PATCH] dax: replace sprintf() by scnprintf()

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Date:   Mon, 12 Jul 2021 13:26:24 +0100
From:   Salah Triki <salah.triki@...il.com>
To:     Joe Perches <joe@...ches.com>
Cc:     dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dax: replace sprintf() by scnprintf()

On Sat, Jul 10, 2021 at 10:04:48AM -0700, Joe Perches wrote:
> On Sat, 2021-07-10 at 17:46 +0100, Salah Triki wrote:
> > Replace sprintf() by scnprintf() in order to avoid buffer overflows.
> 
> OK but also not strictly necessary.  DAX_NAME_LEN is 30.
> 
> Are you finding and changing these manually or with a script?
> 
> > diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
> []
> > @@ -76,7 +76,7 @@ static ssize_t do_id_store(struct device_driver *drv, const char *buf,
> >  	fields = sscanf(buf, "dax%d.%d", &region_id, &id);
> >  	if (fields != 2)
> >  		return -EINVAL;
> > -	sprintf(devname, "dax%d.%d", region_id, id);
> > +	scnprintf(devname, DAX_NAME_LEN, "dax%d.%d", region_id, id);
> >  	if (!sysfs_streq(buf, devname))
> >  		return -EINVAL;
> >  
> > 
> 
> 

since region_id and id are unsigned long may be devname should be
char[21].

I'm finding and changing these manually.

Thanx