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References: <20231115203401.2495875-1-iii@linux.ibm.com> <20231115203401.2495875-7-iii@linux.ibm.com>
In-Reply-To: <20231115203401.2495875-7-iii@linux.ibm.com>
From: Alexander Potapenko <glider@google.com>
Date: Thu, 16 Nov 2023 11:13:30 +0100
Message-ID: <CAG_fn=Viz99-GHX0rnKWo7Wdhw+BLHqNXY_AV0-pT6d1OiGw3A@mail.gmail.com>
Subject: Re: [PATCH 06/32] kmsan: Fix kmsan_copy_to_user() on arches with
 overlapping address spaces
To: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>, Andrew Morton <akpm@linux-foundation.org>, 
	Christoph Lameter <cl@linux.com>, David Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, 
	Marco Elver <elver@google.com>, Masami Hiramatsu <mhiramat@kernel.org>, 
	Pekka Enberg <penberg@kernel.org>, Steven Rostedt <rostedt@goodmis.org>, 
	Vasily Gorbik <gor@linux.ibm.com>, Vlastimil Babka <vbabka@suse.cz>, 
	Christian Borntraeger <borntraeger@linux.ibm.com>, Dmitry Vyukov <dvyukov@google.com>, 
	Hyeonggon Yoo <42.hyeyoo@gmail.com>, kasan-dev@googlegroups.com, 
	linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, 
	linux-trace-kernel@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>, 
	Roman Gushchin <roman.gushchin@linux.dev>, Sven Schnelle <svens@linux.ibm.com>
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On Wed, Nov 15, 2023 at 9:34=E2=80=AFPM Ilya Leoshkevich <iii@linux.ibm.com=
> 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@linux.ibm.com>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>