linux-kernel - Re: [PATCH] arch/powerpc: Remove .interp section in vmlinux

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: <20251015002154.GA2300901@ax162>
Date: Tue, 14 Oct 2025 17:21:54 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Vishal Chourasia <vishalc@...ux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>, maddy@...ux.ibm.com,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	clang-built-linux@...glegroups.com,
	"llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: Re: [PATCH] arch/powerpc: Remove .interp section in vmlinux

Hi Vishal,

On Mon, Oct 13, 2025 at 12:57:00PM +0530, Vishal Chourasia wrote:
> On Mon, Oct 13, 2025 at 08:46:48AM +0200, Christophe Leroy wrote:
> > +CLANG ppl
> > 
> > Hi,
> > 
> > Le 13/10/2025 à 06:01, Vishal Chourasia a écrit :
> > > While debugging a ppc64le QEMU guest on an x86_64 host, I observed GDB crashes
> > > when attempting to attach to the remote target:
> > > 
> > > (gdb) target remote :1234
> > > 
> > > Investigation revealed that cross-compiling the Linux kernel for ppc64le on an
> > > x86_64 host using Clang produces a vmlinux binary containing an empty .interp
> > > section. This empty .interp section is responsible for the GDB crashes.
> > 
> > Which version of CLANG is it ?
> (i) ❯ clang --version
> clang version 21.0.0git (https://github.com/llvm/llvm-project.git a80bccc6847be104948f46d313f03ac6b9ccb292)
> 
> > 
> > > 
> > > This issue does not occur when:
> > > - Building for ppc64le target using GCC on x86_64 host
> > > - Building for ppc64le target using Clang on ppc64le host
> > 
> > Is it the same CLANG version ?
> # clang --version
> clang version 22.0.0git (https://github.com/llvm/llvm-project.git 2f755c543ab357bd83235592fcee37fa391cdd9d)
> 
> > 
> > > - Building for ppc64le target using GCC on ppc64le host
> > > 
> > > For details refer [1]
> > > 
> > > [1] https://sourceware.org/bugzilla/show_bug.cgi?id=33481

In this bug report, you mention using LLVM=1. Does the issue happen if
you use GNU ld (ld.bfd) via LD (i.e., LD=powerpc64le-linux-gnu-ld or
equivalent) over ld.lld from LLVM=1? This sounds more likely to be a
linker difference rather than a compiler difference.

Cheers,
Nathan