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Date: Tue, 25 Jul 2017 13:28:01 +0300
From: Leonard Crestez <>
To: Thomas Garnier <>, Russell King
	<>, Thomas Gleixner <>, "Catalin
 Marinas" <>, Will Deacon <>, "Dave
 Martin" <>, Chris Metcalf <>,
	Pratyush Anand <>
CC: <>, LKML
	<>, Kernel Hardening
Subject: Re: [PATCH 1/3] arm/syscalls: Move address limit check in loop

On Mon, 2017-07-24 at 10:07 -0700, Thomas Garnier wrote:
> On Wed, Jul 19, 2017 at 10:58 AM, Thomas Garnier <
> > wrote:
> > 
> > The work pending loop can call set_fs after addr_limit_user_check
> > removed the _TIF_FSCHECK flag. To prevent the infinite loop, move
> > the addr_limit_user_check call at the beginning of the loop.
> > 
> > Fixes: 73ac5d6a2b6a ("arm/syscalls: Check address limit on user-
> > mode return")
> > Reported-by: Leonard Crestez <>
> > Signed-off-by: Thomas Garnier <>

> Any comments on this patch set?

Tested-by: Leonard Crestez <>

This appears to fix the original issue of failing to boot from NFS when
there are lots of alignment faults. But this is a very basic test
relative to the reach of this change.

However the original patch has been in linux-next for a while and
apparently nobody else noticed system calls randomly hanging on arm.

I assume maintainers need to give their opinion.

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