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Date:   Fri, 18 Feb 2022 15:30:35 +0500
From:   Muhammad Usama Anjum <>
To:     Kees Cook <>
Cc:, Arnd Bergmann <>,
        Greg Kroah-Hartman <>,,
Subject: Re: [PATCH] lkdtm/usercopy: Expand size of "out of frame" object

On 2/17/22 1:17 AM, Kees Cook wrote:
> To be sufficient out of range for the usercopy test to see the lifetime
> mismatch, expand the size of the "bad" buffer, which will let it be
> beyond current_stack_pointer regardless of stack growth direction.
> Paired with the recent addition of stack depth checking under
> CONFIG_HARDENED_USERCOPY=y, this will correctly start tripping again.
> Reported-by: Muhammad Usama Anjum <>
> Cc: Arnd Bergmann <>
> Cc: Greg Kroah-Hartman <>
> Signed-off-by: Kees Cook <>
Reviewed-by: Muhammad Usama Anjum <>

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