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Date:   Thu, 2 Nov 2017 10:19:43 +0100
From:   Geert Uytterhoeven <>
To:     Willy Tarreau <>
Cc:     "" <>,
        stable <>,
        Guenter Roeck <>,
        Helge Deller <>, Hugh Dickins <>,
        Oleg Nesterov <>,
        Andrew Morton <>,
        Linus Torvalds <>
Subject: Re: [PATCH 3.10 112/139] mm: fix overflow check in expand_upwards()

On Wed, Nov 1, 2017 at 10:26 PM, Willy Tarreau <> wrote:
> From: Helge Deller <>
> commit 37511fb5c91db93d8bd6e3f52f86e5a7ff7cfcdf upstream.
> Jörn Engel noticed that the expand_upwards() function might not return

Jörn (yeah, the original commit suffers from this, too ;-)

> -ENOMEM in case the requested address is (unsigned long)-PAGE_SIZE and
> if the architecture didn't defined TASK_SIZE as multiple of PAGE_SIZE.
> Affected architectures are arm, frv, m68k, blackfin, h8300 and xtensa
> which all define TASK_SIZE as 0xffffffff, but since none of those have
> an upwards-growing stack we currently have no actual issue.
> Nevertheless let's fix this just in case any of the architectures with
> an upward-growing stack (currently parisc, metag and partly ia64) define
> TASK_SIZE similar.
> Link:
> Fixes: bd726c90b6b8 ("Allow stack to grow up to address space limit")
> Signed-off-by: Helge Deller <>
> Reported-by: Jörn Engel <>
> Cc: Hugh Dickins <>
> Cc: Oleg Nesterov <>
> Cc: <>
> Signed-off-by: Andrew Morton <>
> Signed-off-by: Linus Torvalds <>
> Signed-off-by: Willy Tarreau <>



Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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