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b=KB2em1D0TG9sOreQAnULlOzGiyVFHVpynip0wNaANytwJdTvJsfLc1t94Gp4sdA60 reurCQSLjzmcuYXQb8UP1FDZYADyYDcl0Br5QKvtX8L1dihJGudl0QBybhXmrh6N3X zFcisJE95iaaNbbzXFeErlfDb4run3HcJz9scgXAPv2L4nLNBaA6AbEnlII5+T6UVy zauG3DYb2u8eYWMUrq64Ac8AVGgWts+sk9WvKpx6El9vNmpuW9EleLWpl5QSrlbwTo bmCdYTyFoXNEXGT3f0ooKFygPIxdLln49x8NHXW/McwgFpqf9zAzmw+YmIbc/LM232 RumQIzjZI7/8g== From: Sasha Levin To: stable@vger.kernel.org, arnd@arndb.de Cc: Andrey Konovalov , Alexander Potapenko , Andrey Ryabinin , Dmitry Vyukov , Marco Elver , Vincenzo Frascino , Andrew Morton , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: FAILED: Patch "kasan/test: avoid gcc warning for intentional overflow" failed to apply to 5.4-stable tree Date: Wed, 27 Mar 2024 08:21:32 -0400 Message-ID: <20240327122133.2836943-1-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: AF402160012 X-Stat-Signature: 4yezxho1c7st9je8ib1qa1mh7f7iqxbb X-Rspam-User: X-HE-Tag: 1711542098-335112 X-HE-Meta: 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 EDexoPmX EJqE6tyQ4n5hMvFCyKrjFN8Nnew== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From e10aea105e9ed14b62a11844fec6aaa87c6935a3 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 12 Feb 2024 12:15:52 +0100 Subject: [PATCH] kasan/test: avoid gcc warning for intentional overflow The out-of-bounds test allocates an object that is three bytes too short in order to validate the bounds checking. Starting with gcc-14, this causes a compile-time warning as gcc has grown smart enough to understand the sizeof() logic: mm/kasan/kasan_test.c: In function 'kmalloc_oob_16': mm/kasan/kasan_test.c:443:14: error: allocation of insufficient size '13' for type 'struct ' with size '16' [-Werror=alloc-size] 443 | ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); | ^ Hide the actual computation behind a RELOC_HIDE() that ensures the compiler misses the intentional bug. Link: https://lkml.kernel.org/r/20240212111609.869266-1-arnd@kernel.org Fixes: 3f15801cdc23 ("lib: add kasan test module") Signed-off-by: Arnd Bergmann Reviewed-by: Andrey Konovalov Cc: Alexander Potapenko Cc: Andrey Ryabinin Cc: Arnd Bergmann Cc: Dmitry Vyukov Cc: Marco Elver Cc: Vincenzo Frascino Cc: Signed-off-by: Andrew Morton --- mm/kasan/kasan_test.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/kasan/kasan_test.c b/mm/kasan/kasan_test.c index 318d9cec111aa..2d8ae4fbe63bb 100644 --- a/mm/kasan/kasan_test.c +++ b/mm/kasan/kasan_test.c @@ -440,7 +440,8 @@ static void kmalloc_oob_16(struct kunit *test) /* This test is specifically crafted for the generic mode. */ KASAN_TEST_NEEDS_CONFIG_ON(test, CONFIG_KASAN_GENERIC); - ptr1 = kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL); + /* RELOC_HIDE to prevent gcc from warning about short alloc */ + ptr1 = RELOC_HIDE(kmalloc(sizeof(*ptr1) - 3, GFP_KERNEL), 0); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr1); ptr2 = kmalloc(sizeof(*ptr2), GFP_KERNEL); -- 2.43.0