netdev - Re: [PATCH 4.1] cfg80211: wext: clear sinfo struct before calling driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Tue, 09 Jun 2015 13:54:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	johannes@...solutions.net
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	gerrit@....abdn.ac.uk, alexkaltsas@...il.com,
	johannes.berg@...el.com
Subject: Re: [PATCH 4.1] cfg80211: wext: clear sinfo struct before calling
 driver

From: Johannes Berg <johannes@...solutions.net>
Date: Tue,  9 Jun 2015 21:35:44 +0200

> From: Johannes Berg <johannes.berg@...el.com>
> 
> Until recently, mac80211 overwrote all the statistics it could
> provide when getting called, but it now relies on the struct
> having been zeroed by the caller. This was always the case in
> nl80211, but wext used a static struct which could even cause
> values from one device leak to another.
> 
> Using a static struct is OK (as even documented in a comment)
> since the whole usage of this function and its return value is
> always locked under RTNL. Not clearing the struct for calling
> the driver has always been wrong though, since drivers were
> free to only fill values they could report, so calling this
> for one device and then for another would always have leaked
> values from one to the other.
> 
> Fix this by initializing the structure in question before the
> driver method call.
> 
> This fixes https://bugzilla.kernel.org/show_bug.cgi?id=99691
> 
> Cc: stable@...r.kernel.org
> Reported-by: Gerrit Renker <gerrit@....abdn.ac.uk>
> Reported-by: Alexander Kaltsas <alexkaltsas@...il.com>
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> ---
> Dave, would you mind applying this patch directly? It seems a
> bit pointless to send a pull request for a single patch again.

Sure, I'll do that right now.

Thanks Johannes.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html