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

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Date:   Sat, 10 Jul 2021 10:04:48 -0700
From:   Joe Perches <joe@...ches.com>
To:     Salah Triki <salah.triki@...il.com>, dan.j.williams@...el.com,
        vishal.l.verma@...el.com, dave.jiang@...el.com
Cc:     nvdimm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dax: replace sprintf() by scnprintf()

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;
>  
>