From: "Arnd Bergmann" <arnd@arndb.de>
To: "Sabyrzhan Tasbolatov" <snovitoll@gmail.com>,
"Andrey Konovalov" <andreyknvl@gmail.com>
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"David Hildenbrand" <david@redhat.com>,
"Dmitry Vyukov" <dvyukov@google.com>,
"Marco Elver" <elver@google.com>,
"Alexander Potapenko" <glider@google.com>,
"Christoph Hellwig" <hch@infradead.org>,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, "Andrey Ryabinin" <ryabinin.a.a@gmail.com>,
"Vincenzo Frascino" <vincenzo.frascino@arm.com>
Subject: Re: [PATCH v2] mm: unexport globally copy_to_kernel_nofault
Date: Sun, 22 Jun 2025 19:44:29 +0200 [thread overview]
Message-ID: <8ab6c624-28a1-47b9-93fc-190719c06727@app.fastmail.com> (raw)
In-Reply-To: <20250622141142.79332-1-snovitoll@gmail.com>
On Sun, Jun 22, 2025, at 16:11, Sabyrzhan Tasbolatov wrote:
> `copy_to_kernel_nofault()` is an internal helper which should not be
> visible to loadable modules – exporting it would give exploit code a
> cheap oracle to probe kernel addresses. Instead, keep the helper
> un-exported and compile the kunit case that exercises it only when
> `mm/kasan/kasan_test.o` is linked into vmlinux.
>
> Fixes: ca79a00bb9a8 ("kasan: migrate copy_user_test to kunit")
> Suggested-by: Christoph Hellwig <hch@infradead.org>
> Suggested-by: Marco Elver <elver@google.com>
> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
> Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
next prev parent reply other threads:[~2025-06-22 17:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-22 5:19 [PATCH] " Sabyrzhan Tasbolatov
2025-06-22 13:00 ` Andrey Konovalov
2025-06-22 14:11 ` [PATCH v2] " Sabyrzhan Tasbolatov
2025-06-22 17:44 ` Arnd Bergmann [this message]
2025-06-22 18:20 ` Andrew Morton
2025-06-22 19:09 ` Sabyrzhan Tasbolatov
2025-06-22 23:45 ` Andrey Konovalov
2025-06-23 8:09 ` David Hildenbrand
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