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:   Tue, 10 Aug 2021 13:33:52 +0200
From:   Arnd Bergmann <>
To:     John Garry <>
Cc:     Linus Torvalds <>,
        linux-arch <>,
        linux-pci <>,
        Linux Kernel Mailing List <>,
        Niklas Schnelle <>
Subject: Re: [GIT PULL 1/2] asm-generic: rework PCI I/O space access

On Tue, Aug 10, 2021 at 11:19 AM John Garry <> wrote:
> On 04/08/2021 09:52, Arnd Bergmann wrote:
> This seems a reasonable approach. Do you have a plan for this work? Or
> still waiting for the green light?

I'm rather busy with other work at the moment, so no particular plans
for any time soon.

> I have noticed the kernel test robot reporting the following to me,
> which seems to be the same issue which was addressed in this series
> originally:
> config: s390-randconfig-r032-20210802 (attached as .config)
> compiler: clang version 13.0.0 (
> 4f71f59bf3d9914188a11d0c41bedbb339d36ff5)
> ...
> All errors (new ones prefixed by >>):
>     In file included from drivers/block/null_blk/main.c:12:
>     In file included from drivers/block/null_blk/null_blk.h:8:
>     In file included from include/linux/blkdev.h:25:
>     In file included from include/linux/scatterlist.h:9:
>     In file included from arch/s390/include/asm/io.h:75:
>     include/asm-generic/io.h:464:31: warning: performing pointer
> arithmetic on a null pointer has undefined behavior
> [-Wnull-pointer-arithmetic]
>             val = __raw_readb(PCI_IOBASE + addr);
> So I imagine lots of people are seeing these.

Right, this is the original problem that Niklas was trying to solve.

If Niklas has time to get this fixed, I can probably find a way to work
with him on finishing up my proposed patch with the changes you


Powered by blists - more mailing lists