Re: [PATCH 06/32] kmsan: Fix kmsan_copy_to_user() on arches with overlapping address spaces

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To: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Subject: Re: [PATCH 06/32] kmsan: Fix kmsan_copy_to_user() on arches with overlapping address spaces
From: Alexander Potapenko <glider@xxxxxxxxxx>
Date: Thu, 16 Nov 2023 11:13:30 +0100
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, Marco Elver <elver@xxxxxxxxxx>, Masami Hiramatsu <mhiramat@xxxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Vasily Gorbik <gor@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>, kasan-dev@xxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-trace-kernel@xxxxxxxxxxxxxxx, Mark Rutland <mark.rutland@xxxxxxx>, Roman Gushchin <roman.gushchin@xxxxxxxxx>, Sven Schnelle <svens@xxxxxxxxxxxxx>
In-reply-to: <20231115203401.2495875-7-iii@linux.ibm.com>
References: <20231115203401.2495875-1-iii@linux.ibm.com> <20231115203401.2495875-7-iii@linux.ibm.com>

On Wed, Nov 15, 2023 at 9:34 PM Ilya Leoshkevich <iii@xxxxxxxxxxxxx> wrote:
>
> Comparing pointers with TASK_SIZE does not make sense when kernel and
> userspace overlap. Assume that we are handling user memory access in
> this case.
>
> Reported-by: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
> Signed-off-by: Ilya Leoshkevich <iii@xxxxxxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>

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References:
- [PATCH 00/32] kmsan: Enable on s390
  - From: Ilya Leoshkevich
- [PATCH 06/32] kmsan: Fix kmsan_copy_to_user() on arches with overlapping address spaces
  - From: Ilya Leoshkevich

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