linux-kernel - Re: [PATCH] slab: ensure cache_alloc

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]

Message-ID: <Pine.LNX.4.64.0702192102060.9934@schroedinger.engr.sgi.com>
Date:	Mon, 19 Feb 2007 21:05:27 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mcr@...delman.ca
Subject: Re: [PATCH] slab: ensure cache_alloc_refill terminates

On Mon, 19 Feb 2007, Pekka J Enberg wrote:

> If slab->inuse is corrupted, cache_alloc_refill can enter an infinite
> loop as detailed by Michael Richardson in the following post:
> <http://lkml.org/lkml/2007/2/16/292>.

We have seen that corruption too.

>  		check_spinlock_acquired(cachep);
> +
> +		/*
> +		 * The slab was either on partial or free list so
> +		 * there must be at least one object available for
> +		 * allocation.
> +		 */
> +		BUG_ON(slabp->inuse >= cachep->num);

slabp->inuse is an integer and we have seen it become -1. The proposed 
test will not catch those cases.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/