linux-kernel - Re: Unpatched return thunk in use. This should not happen!

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: Tue, 26 Mar 2024 16:08:32 +0200
From: Nikolay Borisov <nik.borisov@...e.com>
To: Paul Menzel <pmenzel@...gen.mpg.de>, Thomas Gleixner
 <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
 Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
 Ingo Molnar <mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org
Cc: LKML <linux-kernel@...r.kernel.org>, Marco Elver <elver@...gle.com>,
 kasan-dev@...glegroups.com
Subject: Re: Unpatched return thunk in use. This should not happen!

On 26.03.24 г. 14:40 ч., Paul Menzel wrote:
> Dear Linux folks,
> 
> 
> On a Dell XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022, Linux 6.9-rc1+ 
> built with
> 
>       CONFIG_KCSAN=y
> 

So the problem happens when KCSAN=y CONFIG_CONSTRUCTORS is also enabled 
and this results in an indirect call in do_mod_ctors():

    mod->ctors[i]();

When KCSAN is disabled, do_mod_ctors is empty, hence the warning is not 
printed.