linux-kernel - Re: [PATCH v6 7/8] tpm: Add tpm_buf_read

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Message-ID: <dd74fdb8-93af-4799-b23a-b2595acfc8aa@linux.ibm.com>
Date:   Tue, 28 Nov 2023 07:35:15 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>,
        linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        William Roberts <bill.c.roberts@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Mario Limonciello <mario.limonciello@....com>,
        Jerry Snitselaar <jsnitsel@...hat.com>
Subject: Re: [PATCH v6 7/8] tpm: Add tpm_buf_read_{u8,u16,u32}



On 11/23/23 21:02, Jarkko Sakkinen wrote:
> Declare reader functions for the instances of struct tpm_buf. If the read
> goes out of boundary, TPM_BUF_BOUNDARY_ERROR is set, and subsequent read
> will do nothing.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> ---

> + */
> +u16 tpm_buf_read_u16(struct tpm_buf *buf, off_t *offset)
> +{
> +	u16 value;

This should be __be16 ...

> +
> +	tpm_buf_read(buf, offset, sizeof(value), &value);
> +
> +	return be16_to_cpu(value);
> +}
> +EXPORT_SYMBOL_GPL(tpm_buf_read_u16);
> +
> +/**
> + * tpm_buf_read_u32() - Read 32-bit word from a TPM buffer
> + * @buf:	&tpm_buf instance
> + * @offset:	offset within the buffer
> + *
> + * Return: next 32-bit word
> + */
> +u32 tpm_buf_read_u32(struct tpm_buf *buf, off_t *offset)
> +{
> +	u32 value;

... and this __be32 to avoid this here:

drivers/char/tpm/tpm-buf.c:203:16: warning: cast to restricted __be16
drivers/char/tpm/tpm-buf.c:220:16: warning: cast to restricted __be32