From: Kees Cook <keescook@chromium.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "J. Bruce Fields" <bfields@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/9] rtl8192*: display ESSIDs using %pE
Date: Fri, 6 Sep 2019 08:53:37 -0700 [thread overview]
Message-ID: <201909060851.36ACDB23A@keescook> (raw)
In-Reply-To: <20190906093829.GK2680@smile.fi.intel.com>
On Fri, Sep 06, 2019 at 12:38:29PM +0300, Andy Shevchenko wrote:
> 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@redhat.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.
Oops, you're totally right: I forgot the "*" part here. Ignore my
comment. :)
So, instead, this "upgrades" the escaping from "only NULL" to all the
unprintables.
>
> > > - 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
>
>
--
Kees Cook
prev parent reply other threads:[~2019-09-06 15:53 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190905193604.GC31247@fieldses.org>
2019-09-05 19:44 ` [PATCH 1/9] rtl8192*: display ESSIDs using %pE J. Bruce Fields
2019-09-05 19:44 ` [PATCH 2/9] thunderbolt: show key using %*s not %*pE J. Bruce Fields
2019-09-05 21:17 ` Kees Cook
2019-09-09 19:34 ` Joe Perches
2019-09-05 19:44 ` [PATCH 3/9] staging: wlan-ng: use "%*pE" for serial number J. Bruce Fields
2019-09-05 21:30 ` Kees Cook
2019-09-05 19:44 ` [PATCH 4/9] Remove unused string_escape_*_any_np J. Bruce Fields
2019-09-05 21:32 ` Kees Cook
2019-09-05 19:44 ` [PATCH 5/9] Remove unused %*pE[achnops] formats J. Bruce Fields
2019-09-05 21:34 ` Kees Cook
2019-09-06 10:01 ` Andy Shevchenko
2019-09-06 10:03 ` Andy Shevchenko
2019-09-05 19:44 ` [PATCH 6/9] Eliminate unused ESCAPE_NULL, ESCAPE_SPACE flags J. Bruce Fields
2019-09-05 22:11 ` Kees Cook
2019-09-06 10:17 ` Andy Shevchenko
2019-09-05 19:44 ` [PATCH 7/9] Simplify string_escape_mem J. Bruce Fields
2019-09-05 22:29 ` Kees Cook
2019-09-05 19:44 ` [PATCH 8/9] minor kstrdup_quotable simplification J. Bruce Fields
2019-09-05 22:31 ` Kees Cook
2019-09-05 19:44 ` [PATCH 9/9] Remove string_escape_mem_ascii J. Bruce Fields
2019-09-05 22:34 ` Kees Cook
2019-09-06 10:20 ` Andy Shevchenko
2019-09-05 20:53 ` [PATCH 1/9] rtl8192*: display ESSIDs using %pE Kees Cook
2019-09-06 9:38 ` Andy Shevchenko
2019-09-06 15:53 ` Kees Cook [this message]
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