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  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:   Sun, 4 Jun 2017 17:09:10 +0200
From:   John Paul Adrian Glaubitz <>
To:     Waldemar Brodkorb <>
Cc:     David Miller <>,,
Subject: Re: sparc gcc 7.1 compile issue

Hi Waldemar!

On 06/04/2017 04:40 PM, Waldemar Brodkorb wrote:
>> So, in your point of view it's perfectly fine if an application is able
>> to crash the whole kernel with just user privileges?
>> Shouldn't the kernel be able to cope with that?
> I think he means your kernel you are running might be miscompiled
> with gcc 7.1.

The kernel wasn't compiled by 7.1. It was built with 6.3:

[    0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 4.38.8 2017/02/22 13:51'
[    0.000000] PROMLIB: Root node compatible: sun4v
[    0.000000] Linux version 4.12.0-rc1-sparc64-smp ( (gcc version 6.3.0 20170510 (Debian 6.3.0-17) ) #1 SMP Debian
4.12~rc1-1~exp1~sparc64 (2017-05-17)

> What kernel version you are running?

This has been haunting us since around kernel 4.6 or so. It also
only shows when building with many parallel jobs.

> Which compiler you used to generate the running kernel?

6.3.0 20170510 from the gcc-6 branch.

> If it is gcc 7.1, what is if you try to
> reproduce the crash with the same kernel version compiled with gcc
> 6.3?

It's simply gcc-7's testsuite that's crashing the kernel since kernel
versions around 4.6. We haven't done any kernel compiles with gcc-7.1
yet since gcc-7.1 not yet the default compiler, we're just building the
package in Debian experimental.

> Wouldn't this show if it is a compiler or kernel bug?

Yes and I think the data suggests it's rather a kernel bug than a bug
in gcc.


 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer -
`. `'   Freie Universitaet Berlin -
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

Powered by blists - more mailing lists