From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 061A4C4332F for ; Sun, 5 Nov 2023 21:58:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229451AbjKEV6C (ORCPT ); Sun, 5 Nov 2023 16:58:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229448AbjKEV6B (ORCPT ); Sun, 5 Nov 2023 16:58:01 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E46BEBF; Sun, 5 Nov 2023 13:57:58 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C5716C433C7; Sun, 5 Nov 2023 21:57:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699221478; bh=n34n91FMUrksdk+c27jo66gRnU2yKoyb5esJtMxTQLE=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=HEkEgeT4essBePRujfHGNBM9f/URbJywdVYzzlnohAwNCij4XsiB0gQG9m1MlqdX7 nJ77QX28EA41SDj9hvnw510+WC/ikrpXJYyMiRv1w4SDn76eVCF84JGo3/6VHRd022 T4GEOmB/vIdvpoiWre08WIbzGa1oIoPdw5k9aJaQg0DIduAfpDYbGFXvDF+ueRmc6r /c4OiPIqIu/JbnIHwTbP0LAvBQ21alqsCdBH/e/H29j4hd4LxUc9xOzd0Ya9pJG3og 6pz27VimAftyuw6e+6msxAw8y6uRSjyKYHJxjFRkf6vjE7cV+D9vTevSLP4+TObyko Jt9mpfnQEc8Pg== Message-ID: <0fc4ef0992e0bc4b824b5f395c00a2a4e143b10f.camel@kernel.org> Subject: Re: [PATCH v3 1/6] tpm: Move buffer handling from static inlines to real functions From: Jarkko Sakkinen To: Jerry Snitselaar Cc: linux-integrity@vger.kernel.org, keyrings@vger.kernel.org, James Bottomley , William Roberts , Stefan Berger , David Howells , Jason Gunthorpe , Mimi Zohar , Peter Huewe , Mario Limonciello , Julien Gomes , open list Date: Sun, 05 Nov 2023 23:57:28 +0200 In-Reply-To: References: <20231024011531.442587-1-jarkko@kernel.org> <20231024011531.442587-2-jarkko@kernel.org> Autocrypt: addr=jarkko@kernel.org; prefer-encrypt=mutual; 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 OhxtP1vYUoyv1iQpYsijVlqHhqbA7Va/jVwBJi40tjMFS0E91mK1iRtBzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.1-1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org On Thu, 2023-10-26 at 10:10 -0700, Jerry Snitselaar wrote: > On Wed, Oct 25, 2023 at 08:35:55PM +0300, Jarkko Sakkinen wrote: > > On Wed Oct 25, 2023 at 12:03 PM EEST, Jerry Snitselaar wrote: > > > Reviewed-by: Jerry Snitselaar > >=20 > > On Wed, 2023-10-25 at 02:03 -0700, Jerry Snitselaar wrote: > > > Reviewed-by: Jerry Snitselaar > > >=20 > >=20 > > Thanks I'll add it to the next round. > >=20 > > For the tpm_buf_read(), I was thinking along the lines of: > >=20 > > /** > > =C2=A0* tpm_buf_read() - Read from a TPM buffer > > =C2=A0* @buf: &tpm_buf instance > > =C2=A0* @pos: position within the buffer > > =C2=A0* @count: the number of bytes to read > > =C2=A0* @output: the output buffer > > =C2=A0* > > =C2=A0* Read bytes from a TPM buffer, and update the position. Returns = false when the > > =C2=A0* amount of bytes requested would overflow the buffer, which is e= xpected to > > =C2=A0* only happen in the case of hardware failure. > > =C2=A0*/ > > static bool tpm_buf_read(const struct tpm_buf *buf, off_t *pos, size_t = count, void *output) > > { > > =C2=A0off_t next =3D *pos + count; > >=20 > > =C2=A0if (next >=3D buf->length) { > > =C2=A0pr_warn("%s: %lu >=3D %lu\n", __func__, next, *offset); > > =C2=A0return false; > > =C2=A0} > >=20 > > =C2=A0memcpy(output, &buf->data[*pos], count); > > =C2=A0*offset =3D next; > > =C2=A0return true; > > } > >=20 > > BR, Jarkko > >=20 >=20 > Then the callers will check, and return -EIO? Most likely. My thinking with boolean was that this way it sort of documents that this function can have only single possible error state. If it was int there could be possibly some other error codes to handle... Just would prefer this based on my experience calling other in-kernel functions. I often need to use lxr a lot just to get full understanding of all possible POSIX codes... BR, Jarkko