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 937D61F426E for ; Tue, 3 Dec 2024 14:07:49 +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=1733234869; cv=none; b=PT/9ry7NXKP11x04vK+rlQQFnglbnLKVYtMtBbj+sw5EIbAqGMldTiM39pEI27EAKFWWGyXCZIKXin1IFouJj9fJ5EDeCCu3wTLNlJHiy4US6ugpoTmNaeyWnmUrEF0O5qHgLBukHP7++SONqw3EFDlgBmefEIA09C+8aMDEv5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733234869; c=relaxed/simple; bh=SpGBUMzzkWCT2Deg5Isg6EFn3/Skgtokgr+rG+RwYnw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=mmSA9PkBSZFPt2qTgelWN+R2wrRTmlIrmV94OQWbqaW7vA2pbC2Kp6qy6WrRb6lLZYzzPrhphByC4k70cEZMsNDRihflLKmlubqWP8hCpKlqFLY7V5CZS9UaQ2/jdbJeT24iHVTbZQ2SbTRLxJZPmjisj/hFJDecEzo7X7DahmM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=c2GtPV9O; 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="c2GtPV9O" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0B58DC4CECF; Tue, 3 Dec 2024 14:07:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1733234869; bh=SpGBUMzzkWCT2Deg5Isg6EFn3/Skgtokgr+rG+RwYnw=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=c2GtPV9O/1AjkgkDkDmlWzT2pf3OAsVTOv/I00oYdPFxp+jH313ri/Sb7XXUg/nCi roxr9kcz1hyP37itWJfBWNmoD7N0P+x9Wu0JNgAJW9khAoHoOLHCgAU/5tXw8JKqZJ xURO00FrjhF5ABCC7mLLU35sd2aqq+o8h5IMWmNrNZ19XqYCJ5Zc0hX1yrAUReIJ3z j4TncKe8IHhQ09QNlhbwmpXapxCMu89j2ul7eQogn+5HxlCGyZcp2WLPGoWZgv3d6D 0MMI+z+6kcH/PNrw0LIJ4Uzm0/8ybm6HZysdiYq+eQcZ+PAE8oeywvGJv5dxUsPrn1 UI7cFm9jsXqXw== Message-ID: <7bc96fca991bd0f16c3f0feb5e3ab255385f013e.camel@kernel.org> Subject: Re: [bug report] ceph: decode interval_sets for delegated inos From: Jeff Layton To: Dan Carpenter Cc: ceph-devel@vger.kernel.org Date: Tue, 03 Dec 2024 06:07:48 -0800 In-Reply-To: References: Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 0OX6MYPtv76hka8lW4mnRmZqqx3UtfHX/hF/zH24Gj7A6sYKYLCU3YrI2Ogiu7/ksKcl7goQjpvtV YrOOI5VGLHge0awt7bhMCTM9KAfPc+xL/ZxAMVWd3NCk5SamL2cE99UWgtvNOIYU8m6EjTLhsj8sn 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15, 2019 (linux-next), leads to the following Smatch static > > checker warning: > >=20 > > fs/ceph/mds_client.c:644 ceph_parse_deleg_inos() > > warn: potential user controlled sizeof overflow 'sets * 2 * 8' '0-u32m= ax * 8' > >=20 > > fs/ceph/mds_client.c > > 637 static int ceph_parse_deleg_inos(void **p, void *end, > > 638 struct ceph_mds_session *s) > > 639 { > > 640 u32 sets; > > 641=20 > > 642 ceph_decode_32_safe(p, end, sets, bad); > > ^^^^ > > set to user data here. > >=20 > > 643 if (sets) > > --> 644 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__= le64), bad); > > ^^^^^^^^^^^^^^^^^^^^= ^^^^^ > > This is safe on 64bit but on 32bit systems it can integer overflow/wrap= . > >=20 In practice, the MDS is only sending a few sets at a time, so this is an unlikely overflow. Probably, the right fix is to just clamp "sets" at some value. Maybe 1K or 1M or so? I'd probably rather the Ceph folks propose a patch for this since I'm not heavily involved there these days. > Smatch has similar warnings in ceph_mdsmap_decode(). >=20 > fs/ceph/mdsmap.c:228 ceph_mdsmap_decode() warn: potential user controlled= sizeof overflow 'num_export_targets * 4' '0-u32max * 4' > fs/ceph/mdsmap.c:280 ceph_mdsmap_decode() warn: potential user controlled= sizeof overflow '8 * (n + 1)' '8 * s32min-s32max' > fs/ceph/mdsmap.c:337 ceph_mdsmap_decode() warn: potential user controlled= sizeof overflow '4 * n' '4 * 0-u32max' > fs/ceph/mdsmap.c:339 ceph_mdsmap_decode() warn: potential user controlled= sizeof overflow '4 * n' '4 * 0-u32max' >=20 Yeah, the mdsmap decoding definitely has some warts. It'd be good to fix up some of those too so that they can never be a problem. --=20 Jeff Layton