From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B879129953C; Mon, 5 May 2025 22:43:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746484993; cv=none; b=mSfEOEM4auN7FqSWnSXvF76GH6MOtGtKL6Oc/jF6+PVJDeHfV3I5PAShUsaXy/VuflLHOMSzoGVlTb+N0ydAuW3cDc2dm1lkwkODCx0YsZIcAMnqe0Q8ztlbdMa5e3y+uNIfz4eeKf0u+7x79/7Vxic5L19GQbBs5vrhcbGvHzg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746484993; c=relaxed/simple; bh=vOhOxXNjw4zpR7UC2IKxXrHebiqELIIMpbbJ0NHfh7Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Zg1a0HY0kIl+W/IJUbzIufyy/f9uZukeaeETG/QQ4jrolYWYvfsYeQ4U5a8xTxLDgWwKBEJ/JryYBIWX5GdmNwcmMTDKzamAduupQRUWZxYmVN1fGzlLmYJqgkRitjR9vuanC78+HYrF2fpJCL08BmKfAp1oWx87Qoz3ZFg4Y8U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IeFyMQ6r; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IeFyMQ6r" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C8230C4CEEF; Mon, 5 May 2025 22:43:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746484993; bh=vOhOxXNjw4zpR7UC2IKxXrHebiqELIIMpbbJ0NHfh7Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IeFyMQ6ruiiCngjhWbP3vKUYTwkWLX1qIbw0XEQ2Q2ilTDH9Kx5pTNqn4w5EG7800 Kgc25LT9cly2qx7gmLl3Af9QgraML3FFhCwp8jBeP1IBaKLYt6+bsKKOP2rRRVaVYz hVP0XhXWvEz/II5NwtFsU9Cu8SG8KtDw1WvUxAg4SDodVIhffYMaKzoOsbfO0kRdwZ go/qWEulu5Sli1v09klGnxOVOshkDUC27ZqzAVC3sxiKITQRgdVtwCa2JgC16rKTz+ fbeQ/cy1diU3Xj/q05W/FkwuIihhfBTe1ZRibusTSG2EiejX4C86myUHNcvRrHjHb2 ItG/PQbrAFJpQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mikulas Patocka , Sasha Levin , agk@redhat.com, snitzer@kernel.org, dm-devel@lists.linux.dev Subject: [PATCH AUTOSEL 6.12 115/486] dm: restrict dm device size to 2^63-512 bytes Date: Mon, 5 May 2025 18:33:11 -0400 Message-Id: <20250505223922.2682012-115-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.26 Content-Transfer-Encoding: 8bit From: Mikulas Patocka [ Upstream commit 45fc728515c14f53f6205789de5bfd72a95af3b8 ] The devices with size >= 2^63 bytes can't be used reliably by userspace because the type off_t is a signed 64-bit integer. Therefore, we limit the maximum size of a device mapper device to 2^63-512 bytes. Signed-off-by: Mikulas Patocka Signed-off-by: Sasha Levin --- drivers/md/dm-table.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index dbd39b9722b91..337255393b3c4 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -697,6 +697,10 @@ int dm_table_add_target(struct dm_table *t, const char *type, DMERR("%s: zero-length target", dm_device_name(t->md)); return -EINVAL; } + if (start + len < start || start + len > LLONG_MAX >> SECTOR_SHIFT) { + DMERR("%s: too large device", dm_device_name(t->md)); + return -EINVAL; + } ti->type = dm_get_target_type(type); if (!ti->type) { -- 2.39.5