linux-kernel - Re: [mm/slub] 3616799128: BUG_kmalloc-#(Not_tainted):kmalloc_Redzone

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]

Message-ID: <alpine.DEB.2.22.394.2208011011120.2493025@gentwo.de>
Date:   Mon, 1 Aug 2022 10:13:04 +0200 (CEST)
From:   Christoph Lameter <cl@...two.de>
To:     Feng Tang <feng.tang@...el.com>
cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        "Sang, Oliver" <oliver.sang@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>, lkp <lkp@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "lkp@...ts.01.org" <lkp@...ts.01.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        John Garry <john.garry@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>
Subject: Re: [mm/slub] 3616799128:
 BUG_kmalloc-#(Not_tainted):kmalloc_Redzone_overwritten

On Mon, 1 Aug 2022, Feng Tang wrote:

> > Or does it make sense to prohibit KASAN+SLUB_DEBUG combination? Does
> > SLUB_DEBUG add anything on top of KASAN?
>
> I did a quick glance, seems the KASAN will select SLUB_DEBUG in
> many cases, as shown in the lib/Kconfig.kasan:
>
> 	config KASAN_GENERIC
> 		...
> 		select SLUB_DEBUG if SLUB
>
> 	config KASAN_SW_TAGS
> 		...
> 		select SLUB_DEBUG if SLUB

SLUB_DEBUG is on by default on all distros. This just means that debugging
support is compiled in but not activated. Kasan etc could depend on
SLUB_DEBUG. Without SLUB_DEBUG the debugging infrastructure of SLUB that
is use by Kasan is not included.

If you want to enable debugging on bootup then you need to set
SLUB_DEBUG_ON.