1a2e558c8b
commit6c4e79d99eupstream. The size of the buffers for storing context's and sessions can vary from arch to arch as PAGE_SIZE can be anything between 4 kB and 256 kB (the maximum for PPC64). Define a fixed buffer size set to 16 kB. This should be enough for most use with three handles (that is how many we allow at the moment). Parametrize the buffer size while doing this, so that it is easier to revisit this later on if required. Cc: stable@vger.kernel.org Reported-by: Stefan Berger <stefanb@linux.ibm.com> Fixes:745b361e98("tpm: infrastructure for TPM spaces") Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Tested-by: Stefan Berger <stefanb@linux.ibm.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017 James.Bottomley@HansenPartnership.com
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*/
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#include <linux/slab.h>
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#include "tpm-dev.h"
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struct tpmrm_priv {
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struct file_priv priv;
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struct tpm_space space;
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};
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static int tpmrm_open(struct inode *inode, struct file *file)
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{
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struct tpm_chip *chip;
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struct tpmrm_priv *priv;
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int rc;
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chip = container_of(inode->i_cdev, struct tpm_chip, cdevs);
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (priv == NULL)
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return -ENOMEM;
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rc = tpm2_init_space(&priv->space, TPM2_SPACE_BUFFER_SIZE);
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if (rc) {
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kfree(priv);
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return -ENOMEM;
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}
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tpm_common_open(file, chip, &priv->priv, &priv->space);
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return 0;
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}
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static int tpmrm_release(struct inode *inode, struct file *file)
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{
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struct file_priv *fpriv = file->private_data;
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struct tpmrm_priv *priv = container_of(fpriv, struct tpmrm_priv, priv);
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tpm_common_release(file, fpriv);
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tpm2_del_space(fpriv->chip, &priv->space);
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kfree(priv);
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return 0;
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}
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const struct file_operations tpmrm_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.open = tpmrm_open,
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.read = tpm_common_read,
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.write = tpm_common_write,
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.poll = tpm_common_poll,
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.release = tpmrm_release,
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};
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