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 A9F632C3747; Mon, 5 May 2025 22:20:14 +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=1746483614; cv=none; b=cYNynmNSQ7C9hT4W9KT3ATnxMJm6BVzuCkRHaAQw6I2PVpGMKCnZ3PC8kwSG/NMYaGxKPgJ63L+CcSG62PkSD2XYEuXd/ngJ5ZrAq2bc07ZEGihmx5CLCmSvslh5mJFcgckShi9qrWN39oMrsU3pO2QVjQWDrA7Umk/Cd8sZzdY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746483614; c=relaxed/simple; bh=6VySRvUn0/SE5ZxArdHZ7nv3IRQQBbPv6uTQLCyONLc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=GsHWfo3/tfjXO2dOreltW7d17nCqGD7hdFlr+DVV+EfnKAVuYBGQdaPrAedNL+r8F5xnaeYGrf3qH7zL01q+U8lEv1DaYzz3xnX4V/SiumT/S5QgAPSg1nk9G+qzOKZFYNqegVheJ4SPM6vsNuR0bViGOOvkz00wuPfdCkWqrs8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TjbsEg3k; 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="TjbsEg3k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BE5F7C4CEE4; Mon, 5 May 2025 22:20:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746483614; bh=6VySRvUn0/SE5ZxArdHZ7nv3IRQQBbPv6uTQLCyONLc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TjbsEg3kbt5kjsGL8aOap5EmnxcgfF3nFUci9uhOqdKYOnIEQb6FLdm3TzElNe9yo cOLWAvSWf7wRQNBFG+o8RxiLTacM6gRddHjFdrL3zN7/Gn9nZec8ffBvJaK7Xdm534 l70o5JmYbReX8nQ9xb4W7Sjrj/ok0Vz6M7AvFhYqhsUOdI0tdNaHIIy9FGHFu2sfKU u0RgZLIup4ESRAVWYS9iJOL/TCkxARHGZoxWWkfg9z43hSJLpjPASJ01f2zgKhNk/X hcM32A8KMvQ/PET0ZOGjGhECiDn2qMyU8kESTBYJlga4w+xHfC5CAiDya5e2dbwm+L 2lEAg/mjIKO4w== 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 6.14 144/642] dm: restrict dm device size to 2^63-512 bytes Date: Mon, 5 May 2025 18:06:00 -0400 Message-Id: <20250505221419.2672473-144-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505221419.2672473-1-sashal@kernel.org> References: <20250505221419.2672473-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.14.5 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 0ef5203387b26..04b3e9758e531 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