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Date: Mon, 25 Jun 2018 19:50:46 +0200
From: Solar Designer <>
Cc: Vasily Averin <>
Subject: Re: 32-bit syscall breakage in -431 kernel with KAISER

On Mon, Jun 25, 2018 at 07:29:42PM +0200, Pavel Kankovsky wrote:
> 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.

Thanks!  How exactly did you debug this, on which kernel/build?


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