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Date: Mon, 25 Jun 2018 19:29:42 +0200 (CEST)
From: Pavel Kankovsky <>
cc: Vasily Averin <>
Subject: Re: 32-bit syscall breakage in -431 kernel with KAISER

On Sun, 24 Jun 2018, Solar Designer wrote:

> My preliminary analysis suggests that maybe the KAISER backport broke 
> the pt_regs ABI for 32-bit syscalls in x86_64 kernels.  Specifically, 
> SIOCGIFCONF might be failing with EFAULT because fs/compat_ioctl.c: 
> dev_ifconf() uses compat_alloc_user_space():

Yes. It fails because compat_alloc_user_space returns NULL.

Pavel Kankovsky aka Peak                      "Que s├žay-je?"

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