linux-hardening - Re: [PATCH 0/3] Fixes for usercopy

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Date:   Mon, 13 Jun 2022 16:04:24 +0800
From:   Zorro Lang <zlang@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Kees Cook <keescook@...omium.org>, linux-mm@...ck.org,
        Uladzislau Rezki <urezki@...il.com>, linux-xfs@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/3] Fixes for usercopy

On Sun, Jun 12, 2022 at 10:32:24PM +0100, Matthew Wilcox (Oracle) wrote:
> Kees, I'm hoping you'll take these through your tree.  I think they're
> all reasonable fixes to go into 5.19.  The first one is essential;
> it fixes two different bugs that people have hit.
> 
> Matthew Wilcox (Oracle) (3):
>   usercopy: Handle vm_map_ram() areas
>   usercopy: Cast pointer to an integer once
>   usercopy: Make usercopy resilient against ridiculously large copies

Hi Matthew,

[Quick response] ...
After merging this patchset onto linux v5.19-rc2, I can't reproduce bug [1]
anymore. I'd like to keep the test running, if it find other issues I'll
feedback.

Thanks,
Zorro

[1]
https://bugzilla.kernel.org/show_bug.cgi?id=216073

> 
>  include/linux/vmalloc.h |  1 +
>  mm/usercopy.c           | 24 +++++++++++++-----------
>  mm/vmalloc.c            |  2 +-
>  3 files changed, 15 insertions(+), 12 deletions(-)
> 
> -- 
> 2.35.1
>