From patchwork Sat May 18 21:36:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 797719 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 CFCA56CDC8; Sat, 18 May 2024 21:37:29 +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=1716068250; cv=none; b=kWHM6l8JsCpNCZXEJrcs5aFTrolPT6OVSeS5JiGFYL+j+IVKtpgJeLo+FaWaT9+nEEOUg46slHDhjlQvBfdI8hJjjoxxCIRsw+oiuwShWDui1lZlDX6gxW41u6WHwktNuqdbpml7EOV4FzrUAhS2qTeGCkNR9iKUuWKtfsXiBbA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716068250; c=relaxed/simple; bh=tA41U9a2wJeaKnsli+rQ8ii0Z8V5FL/JPrU6bK6Nik0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=KwiOah7lL+fXq5tiVqmppfXx9eOlxIbSvqsZanoxv92nB8Iro+s7MCgbxmyTkYGheY6t5W7g6S+yTJ5b628qjlmbU4NZAw8zq5HePIIvlqErTl6VH1JTkbek/WwLpFySZABzXbsi0PKQ18DtdjaIc9a3hzdL3MSR55JYtrm4VvM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ed+nA6ka; 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="ed+nA6ka" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 172B0C113CC; Sat, 18 May 2024 21:37:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716068249; bh=tA41U9a2wJeaKnsli+rQ8ii0Z8V5FL/JPrU6bK6Nik0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ed+nA6karKcB1mIgDVAhFBBO0U0GV0RiNJn9faBv9vR9wtVAbUetdW90GPR9guC/z GUhJ3gJHRP4MvyroDIgA8cSML9SJ4X0iO9bTc1Ys0QJbXlFn3xgMeUYcRdCcsRgcY1 zuXCuB0kd9/B1UZq7pTdpegek1Aq+z6cmx8twpK1oBd9ydTWsqzSUX7OkFbXicWTom S0cCTpIQqeSs121rSkOwVYzO8iQyrvVQR3JKMDBs5demkfjH/mKGgyd6aylpI89Sgv +WkeKvQCSY+jVn3J6xS+YgawI0ReLuDcvk3q3w0Y/s75xpTvHr+Hg+S/fronCo9NMK lsl7nPmiJN5Ng== From: Jarkko Sakkinen To: Herbert Xu Cc: linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, Andreas.Fuchs@infineon.com, James Prestwood , David Woodhouse , Jarkko Sakkinen , David Howells , "David S. Miller" , Peter Huewe , Jason Gunthorpe , James Bottomley , Stefan Berger , Ard Biesheuvel , Mario Limonciello , linux-crypto@vger.kernel.org (open list:CRYPTO API), linux-kernel@vger.kernel.org (open list), stable@vger.kernel.org, Mimi Zohar , Paul Moore , James Morris , "Serge E. Hallyn" , linux-security-module@vger.kernel.org (open list:SECURITY SUBSYSTEM) Subject: [PATCH RFC 3/5] KEYS: trusted: Do not use WARN when encode fails Date: Sun, 19 May 2024 00:36:23 +0300 Message-ID: <20240518213700.5960-4-jarkko@kernel.org> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240518213700.5960-1-jarkko@kernel.org> References: <20240518213700.5960-1-jarkko@kernel.org> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When asn1_encode_sequence() fails, WARN is not the correct solution. 1. asn1_encode_sequence() is not an internal function (located in lib/asn1_encode.c). 2. Location is known, which makes the stack trace useless. 3. Results a crash if panic_on_warn is set. It is also noteworthy that the use of WARN is undocumented, and it should be avoided unless there is a carefully considered rationale to use it. Replace WARN with pr_err, and print the return value instead, which is only useful piece of information. Cc: stable@vger.kernel.org # v5.13+ Fixes: f2219745250f ("security: keys: trusted: use ASN.1 TPM2 key format for the blobs") Signed-off-by: Jarkko Sakkinen --- security/keys/trusted-keys/trusted_tpm2.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/security/keys/trusted-keys/trusted_tpm2.c b/security/keys/trusted-keys/trusted_tpm2.c index dfeec06301ce..dbdd6a318b8b 100644 --- a/security/keys/trusted-keys/trusted_tpm2.c +++ b/security/keys/trusted-keys/trusted_tpm2.c @@ -38,6 +38,7 @@ static int tpm2_key_encode(struct trusted_key_payload *payload, u8 *end_work = scratch + SCRATCH_SIZE; u8 *priv, *pub; u16 priv_len, pub_len; + int ret; priv_len = get_unaligned_be16(src) + 2; priv = src; @@ -79,8 +80,11 @@ static int tpm2_key_encode(struct trusted_key_payload *payload, work1 = payload->blob; work1 = asn1_encode_sequence(work1, work1 + sizeof(payload->blob), scratch, work - scratch); - if (WARN(IS_ERR(work1), "BUG: ASN.1 encoder failed")) - return PTR_ERR(work1); + if (IS_ERR(work1)) { + ret = PTR_ERR(work1); + pr_err("ASN.1 encode error %d\n", ret); + return ret; + } return work1 - payload->blob; }