musl - Re: diffutils crash in malloc

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Message-ID: <AM5PR0802MB26119E1FA20D6E23CF60FB25892A0@AM5PR0802MB2611.eurprd08.prod.outlook.com>
Date: Sun, 12 Nov 2017 22:02:26 +0000
From: Tobias Koch <tobias.koch@...terra.com>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: Re: diffutils crash in malloc

Hi,


I should have pointed out that even though I was inside a mipsel target, the diff from the tools folder is an x86_64 binary:


build@...-fdfceb:~/spool/mipsel$ file sys-root/tools/bin/diff

sys-root/tools/bin/diff: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /tools/lib/ld-musl-x86_64.so.1, BuildID[sha1]=80131005d1754ee60ea69e49e4d212c0ee53002a, not stripped


And this is diffutils 3.5.


Tobias


________________________________
From: A. Wilcox <awilfox@...lielinux.org>
Sent: Monday, November 13, 2017 12:50 AM
To: musl@...ts.openwall.com
Subject: Re: [musl] diffutils crash in malloc

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On 12/11/17 15:46, Tobias Koch wrote:
> Hi,
>
> when I switched from musl 1.1.16 to 1.1.17 (and now 1.1.18) diff
> started to crash. The gdb backtrace shows, that this happens
> during memory allocation:
>
> build@...tstrap(mipsel):~$ gdb /tools/bin/diff

[snip]

I notice you are using mipsel.  Do you see this on any other
architectures?  diffutils compiled against 1.1.16 runs fine against
1.1.17 and 1.1.18 here on x86_64 (64-bit, LE) and ppc (32-bit, BE).
So it seems this may be a MIPS issue.

> Here a and b are empty files, but this happens with other input,
> as well. diffutils' xmalloc looks fairly inconspicuous to me:
>
> I understand this may very well be a problem in diff and not musl.
> But this is the exact same version of diffutils included with
> Debian Stretch and running the same under Valgrind compiled against
> glibc shows no problems. My wisdom ends here. Any clues how I can
> get to the bottom of this?
>
> Tobias
>

Are you using valgrind and glibc on the same hardware (mipsel)?

Best,
- --arw


- --
A. Wilcox (awilfox)
Project Lead, Adélie Linux
http://adelielinux.org
Adélie Linux<http://adelielinux.org/>
adelielinux.org
Freedom over politics. Adélie Linux gives you the choice to run your system your way. Your freedom, privacy, and right of choice are what truly matters.



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