linux-kernel - Re: [PATCH 1/3] lib/hexdump: Add a raw pointer printing format for slub debugging

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: <20210524113647.h2avhbrngyydwwqn@pathway.suse.cz>
Date:   Mon, 24 May 2021 13:36:47 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] lib/hexdump: Add a raw pointer printing format for
 slub debugging

On Wed 2021-05-19 18:35:37, Stephen Boyd wrote:
> We want to get actual pointer addresses when we're looking at slub
> debugging reports. Add another prefix format specifier that says we want
> raw pointer addresses, i.e. %px, in the printk format.

This patch makes sense only with the 2nd patch.

Please, do not do this! Raw pointers might be printed safely
only in panic(). Users should be warned by the fat warning
triggered by "no_hash_pointers" in other use-cases. And
this patch is not needed when "no_hash_pointers" are enabled.

Best Regards,
Petr