From patchwork Sun May 19 00:25:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 13667742 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 2FCB617BB4; Sun, 19 May 2024 00:26:50 +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=1716078410; cv=none; b=SYv6GgtnvqtlGbKDjcva5TBN16e/XnUEcG3zwtgxETWM4kLI9K4cPc1y+ECW6VNuMlZ3Q6telDRzY9eLq61PP1NO1Ne7ZcPgv9q3h/Apmwz0Ug5QielFg4p7K+uRdnIhWJQdron4/npIWpA83WjsYQIgbKjQrHhRQisx7JDwK2I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716078410; c=relaxed/simple; bh=tA41U9a2wJeaKnsli+rQ8ii0Z8V5FL/JPrU6bK6Nik0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ooz+4RB6qmNjDyn/IVuQAYDGlcvQboeiFDcxyKwbv8xpTqEsZTO5bY8MDHfVK9hWJV8K41vFdDxpHU+b6+Tl8EwBTU2QDHymotB3lABTGJCUaABMEZdjZJcs7CSTOGWvSClR3cBBG3Q3tHuJ1X1+Xnf2vzyD8GVVYCIZ13wsaGw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LYgqatHz; 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="LYgqatHz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A72F2C113CC; Sun, 19 May 2024 00:26:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716078410; bh=tA41U9a2wJeaKnsli+rQ8ii0Z8V5FL/JPrU6bK6Nik0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LYgqatHzz1WGjNvwpUpAVbnbC6B/NbjwS0MlenTbE2+xLJIgc0ueGxZys8RPOdghJ tFJaozoUKGuicRSwMVwUIeVa3nQGYrwOuubRix9syo0imHO35dof6ooNYzLgQ50ANm xo9AJQVjK3qRsLNmbXkYeFmAWMEcX8ZUWWm0G5Y3vbVE29shw4q5BeDItDgKrT26hn enWAiyTwwsJ+FTUsxqN0CXK4KmZsmur8rUrrXBsn/9eBKQlanxkOUmQLhGocDzX/V7 7w6ngwcM53IsIn8v9gFgaRafW4hPsjI8NV6AKsO3+b/wC4CWhRU1lMKFmKGtY3yks5 GuzOeOrsQYcpg== 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 v2 3/5] KEYS: trusted: Do not use WARN when encode fails Date: Sun, 19 May 2024 03:25:38 +0300 Message-ID: <20240519002616.4432-4-jarkko@kernel.org> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240519002616.4432-1-jarkko@kernel.org> References: <20240519002616.4432-1-jarkko@kernel.org> Precedence: bulk X-Mailing-List: linux-security-module@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; }