linux-kernel - Re: [PATCH 1/9] rtl8192*: display ESSIDs using %pE

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Message-ID: <20190906093829.GK2680@smile.fi.intel.com>
Date:   Fri, 6 Sep 2019 12:38:29 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     "J. Bruce Fields" <bfields@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/9] rtl8192*: display ESSIDs using %pE

On Thu, Sep 05, 2019 at 01:53:43PM -0700, Kees Cook wrote:
> On Thu, Sep 05, 2019 at 03:44:25PM -0400, J. Bruce Fields wrote:
> > From: "J. Bruce Fields" <bfields@...hat.com>
> > 
> > Everywhere else in the kernel ESSIDs are printed using %pE, and I can't
> > see why there should be an exception here.
> 
> I would expand this rationale slightly: using "n" here makes no sense
> because they are already NUL-terminated strings. The "n" modifier could
> only be used with string_escape_mem() which takes a "length" argument.

SSID may have NUL in any location in the name.

> > -	snprintf(escaped, sizeof(escaped), "%*pEn", essid_len, essid);
> > +	snprintf(escaped, sizeof(escaped), "%*pE", essid_len, essid);

> > -	snprintf(escaped, sizeof(escaped), "%*pEn", essid_len, essid);
> > +	snprintf(escaped, sizeof(escaped), "%*pE", essid_len, essid);

-- 
With Best Regards,
Andy Shevchenko