linux-kernel - Re: [PATCH 3/3] powerpc: lib: sstep: fix build errors

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, 23 Feb 2022 09:27:19 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     mpe@...erman.id.au, Arnd Bergmann <arnd@...db.de>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 3/3] powerpc: lib: sstep: fix build errors

On Wed, Feb 23, 2022 at 02:58:20PM +0100, Anders Roxell wrote:
> Building tinyconfig with gcc (Debian 11.2.0-16) and assembler (Debian
> 2.37.90.20220207) the following build error shows up:
> 
> {standard input}: Assembler messages:
> {standard input}:10576: Error: unrecognized opcode: `stbcx.'
> {standard input}:10680: Error: unrecognized opcode: `lharx'
> {standard input}:10694: Error: unrecognized opcode: `lbarx'
> 
> Rework to add assembler directives [1] around the instruction.  The
> problem with this might be that we can trick a power6 into
> single-stepping through an stbcx. for instance, and it will execute that
> in kernel mode.
> 
> [1] https://sourceware.org/binutils/docs/as/PowerPC_002dPseudo.html#PowerPC_002dPseudo

Wow, no wonder you think you need quotes after reading that.  I'll try
to get that fixed.

Reviewed-by: Segher Boessenkool <segher@...nel.crashing.org>


Segher