netdev - Re: [PATCH] nl80211: fix attrbuf access race by allocating a separate one

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

Date:	Wed, 19 Jun 2013 01:39:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	johannes@...solutions.net
Cc:	torvalds@...ux-foundation.org, linville@...driver.com,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] nl80211: fix attrbuf access race by allocating a
 separate one

From: Johannes Berg <johannes@...solutions.net>
Date: Wed, 19 Jun 2013 10:23:58 +0200

> From: Johannes Berg <johannes.berg@...el.com>
> 
> Since my commit 3713b4e364, nl80211_dump_wiphy() uses the global
> nl80211_fam.attrbuf for parsing the incoming data. This wouldn't
> be a problem if it only did so on the first dump iteration which
> is locked against other commands in generic netlink, but due to
> space constraints in cb->args (the needed state doesn't fit) I
> decided to always parse the original message. That's racy though
> since nl80211_fam.attrbuf could be used by some other parsing in
> generic netlink concurrently.
> 
> For now, fix this by allocating a separate parse buffer (it's a
> bit too big for the stack, currently 1448 bytes on 64-bit). For
> -next, I'll change the code to parse into the global buffer in
> the first round only and then allocate a smaller buffer to keep
> the state in cb->args.
> 
> Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>

Acked-by: David S. Miller <davem@...emloft.net>
--
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