From: andrey.konovalov@linux.dev
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Marco Elver <elver@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Alexander Potapenko <glider@google.com>,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 8/8] kasan: test: avoid corrupting memory in kasan_rcu_uaf
Date: Thu, 12 Aug 2021 17:05:46 +0200 [thread overview]
Message-ID: <b6f2c3bf712d2457c783fa59498225b66a634f62.1628779805.git.andreyknvl@gmail.com> (raw)
In-Reply-To: <cover.1628779805.git.andreyknvl@gmail.com>
From: Andrey Konovalov <andreyknvl@gmail.com>
kasan_rcu_uaf() writes to freed memory via kasan_rcu_reclaim(), which is
only safe with the GENERIC mode (as it uses quarantine). For other modes,
this test corrupts kernel memory, which might result in a crash.
Turn the write into a read.
Signed-off-by: Andrey Konovalov <andreyknvl@gmail.com>
---
lib/test_kasan_module.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/test_kasan_module.c b/lib/test_kasan_module.c
index fa73b9df0be4..7ebf433edef3 100644
--- a/lib/test_kasan_module.c
+++ b/lib/test_kasan_module.c
@@ -71,7 +71,7 @@ static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp)
struct kasan_rcu_info, rcu);
kfree(fp);
- fp->i = 1;
+ ((volatile struct kasan_rcu_info *)fp)->i;
}
static noinline void __init kasan_rcu_uaf(void)
--
2.25.1
next prev parent reply other threads:[~2021-08-12 15:05 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 14:53 [PATCH v2 0/8] kasan: test: avoid crashing the kernel with HW_TAGS andrey.konovalov
2021-08-12 14:53 ` [PATCH v2 1/8] kasan: test: rework kmalloc_oob_right andrey.konovalov
2021-08-12 14:53 ` [PATCH v2 2/8] kasan: test: avoid writing invalid memory andrey.konovalov
2021-08-12 14:53 ` [PATCH v2 3/8] kasan: test: avoid corrupting memory via memset andrey.konovalov
2021-08-12 14:53 ` [PATCH v2 4/8] kasan: test: disable kmalloc_memmove_invalid_size for HW_TAGS andrey.konovalov
2021-08-12 14:53 ` [PATCH v2 5/8] kasan: test: only do kmalloc_uaf_memset for generic mode andrey.konovalov
2021-08-12 14:56 ` [PATCH v2 6/8] kasan: test: clean up ksize_uaf andrey.konovalov
2021-08-12 15:00 ` [PATCH v2 7/8] kasan: test: avoid corrupting memory in copy_user_test andrey.konovalov
2021-08-12 15:05 ` andrey.konovalov [this message]
2021-08-12 15:05 ` [PATCH v2 0/8] kasan: test: avoid crashing the kernel with HW_TAGS Andrey Konovalov
2021-08-12 15:44 ` Marco Elver
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