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Date: Sun, 17 May 2015 15:06:16 +0200
From: Felix Janda <felix.janda@...teo.de>
To: musl@...ts.openwall.com
Subject: Re: ppc soft-float regression

Waldemar Brodkorb wrote:
> Hi,
> 
> as mentioned the days on IRC.
> 1.1.9 produces a lot of segfaults on Qemu-PPC with Soft-Float.
> 1.1.8 was fine.
> 
> Execute Qemu as this:
> qemu-system-ppc -nographic -M bamboo -device e1000,netdev=adk0 \
> -netdev user,id=adk0 -kernel qemu-ppc-initramfs-kernel
> -initrd qemu-ppc-musl-initramfs
> 
> wbx@...om:~/musl-ppc $ qemu-system-ppc --version                                                                                                               
> QEMU emulator version 2.3.0, Copyright (c) 2003-2008 Fabrice Bellard
> 
> The system stopps at boot. strg-d to continue the boot with
> /etc/init.d/rcS.
> 
> Strace is available in /usr/sbin/strace.
> 
> Get the kernels and initramfs from here:
> http://openadk.org/musl-ppc/
> 
> Any ideas?

I can reproduce with your binaries, but not with self-built ones.

Your binaries seem to have an executable stack:

   STACK off    0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**4
         filesz 0x00000000 memsz 0x00000000 flags rwx

Make sure that your binaries are compiled with -msecure-plt and
-Wl,--secure-plt. (The musl gcc patches should enable these options
automatically.)

Felix

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