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 DA0A42DF57D; Mon, 5 May 2025 22:58:49 +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=1746485930; cv=none; b=arNrTyYiNZt2N+Z5S9sy39T15N5GyjD95nzgw0KoXUsUshs0W/cPc17T1kImg25jFLra9n3bAqGAno1SHrecP64rm00sdbM75JppNxapEEP5EoJ623CwI4VZtGi5PDHVUNmwaAfXdVRq6vZpDG5RMvBUXO3DW2Q6cH0dRjnMDvs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746485930; c=relaxed/simple; bh=xAQ9TRBt9kOvMcTBbHvhw54Knw6blmAnNV9ZJZIyMwc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=j3G/iarVsl1SBBnQ87UgmWQABwDCAYa15YY4KYIoBGyWVhRx79JRC6oJgYQ1InDxgihtnjzptToDzT+hj+0qbTQZDXpfPNVrZE85ygy7OhcUxcJO077SkeU9Kc0wRe4WU6eThUtfLBZD2IyhG+RISBH9TcaNHiS4be/KtzIAC74= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=quE8o4bK; 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="quE8o4bK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EACFCC4CEE4; Mon, 5 May 2025 22:58:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746485929; bh=xAQ9TRBt9kOvMcTBbHvhw54Knw6blmAnNV9ZJZIyMwc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=quE8o4bKKQMDYzx67BgZpO/pMAS2IbhC03OeKbXu7cme1IJJrjmg93dyveTbhyhlf +06ocTJY4/d6eAE2092KC8bOFJwicHRbILmE3aBW3x6rWZnSHn25s3pUeBEtX+BNp2 9kRsYfDxBHDpXDDvkiB4KcEEIPMffCD+/M+adyYHJr+RFCDXQkniqSzq96iofjiJCv APTDkDM7RiQgdTznimzWGW9KWmrOL3aAp2VLLvPqSVU4LjZji0UTnQ0pqsNsGV+qWO FHclPLzEneQlZF1xLQdLGtKbXB1Rf/RH3Sm5ofquAi7ld+XGHC7fKt1jdTc8JsY59w DU+khjFcrFv3g== 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 6.6 071/294] dm: restrict dm device size to 2^63-512 bytes Date: Mon, 5 May 2025 18:52:51 -0400 Message-Id: <20250505225634.2688578-71-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505225634.2688578-1-sashal@kernel.org> References: <20250505225634.2688578-1-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 6.6.89 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 fd84e06670e8d..50de96e4e6c33 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -668,6 +668,10 @@ 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