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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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1f450730ff
0day robot reports 'sample_report' can be static, fix it up. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202505090938.avfIhLsl-lkp@intel.com/ Signed-off-by: Cedric Xing <cedric.xing@intel.com> Link: https://patch.msgid.link/20250509030350.22363-1-cedric.xing@intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright(c) 2024-2005 Intel Corporation. All rights reserved. */
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#define pr_fmt(x) KBUILD_MODNAME ": " x
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#include <linux/module.h>
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#include <linux/tsm-mr.h>
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#include <linux/miscdevice.h>
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#include <crypto/hash.h>
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static struct {
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u8 static_mr[SHA384_DIGEST_SIZE];
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u8 config_mr[SHA512_DIGEST_SIZE];
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u8 rtmr0[SHA256_DIGEST_SIZE];
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u8 rtmr1[SHA384_DIGEST_SIZE];
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u8 report_digest[SHA512_DIGEST_SIZE];
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} sample_report = {
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.static_mr = "static_mr",
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.config_mr = "config_mr",
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.rtmr0 = "rtmr0",
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.rtmr1 = "rtmr1",
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};
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static int sample_report_refresh(const struct tsm_measurements *tm)
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{
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struct crypto_shash *tfm;
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int rc;
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tfm = crypto_alloc_shash(hash_algo_name[HASH_ALGO_SHA512], 0, 0);
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if (IS_ERR(tfm)) {
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pr_err("crypto_alloc_shash failed: %ld\n", PTR_ERR(tfm));
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return PTR_ERR(tfm);
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}
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rc = crypto_shash_tfm_digest(tfm, (u8 *)&sample_report,
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offsetof(typeof(sample_report),
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report_digest),
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sample_report.report_digest);
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crypto_free_shash(tfm);
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if (rc)
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pr_err("crypto_shash_tfm_digest failed: %d\n", rc);
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return rc;
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}
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static int sample_report_extend_mr(const struct tsm_measurements *tm,
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const struct tsm_measurement_register *mr,
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const u8 *data)
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{
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SHASH_DESC_ON_STACK(desc, 0);
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int rc;
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desc->tfm = crypto_alloc_shash(hash_algo_name[mr->mr_hash], 0, 0);
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if (IS_ERR(desc->tfm)) {
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pr_err("crypto_alloc_shash failed: %ld\n", PTR_ERR(desc->tfm));
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return PTR_ERR(desc->tfm);
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}
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rc = crypto_shash_init(desc);
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if (!rc)
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rc = crypto_shash_update(desc, mr->mr_value, mr->mr_size);
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if (!rc)
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rc = crypto_shash_finup(desc, data, mr->mr_size, mr->mr_value);
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crypto_free_shash(desc->tfm);
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if (rc)
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pr_err("SHA calculation failed: %d\n", rc);
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return rc;
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}
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#define MR_(mr, hash) .mr_value = &sample_report.mr, TSM_MR_(mr, hash)
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static const struct tsm_measurement_register sample_mrs[] = {
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/* static MR, read-only */
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{ MR_(static_mr, SHA384) },
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/* config MR, read-only */
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{ MR_(config_mr, SHA512) | TSM_MR_F_NOHASH },
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/* RTMR, direct extension prohibited */
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{ MR_(rtmr0, SHA256) | TSM_MR_F_LIVE },
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/* RTMR, direct extension allowed */
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{ MR_(rtmr1, SHA384) | TSM_MR_F_RTMR },
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/* RTMR, crypto agile, alaised to rtmr0 and rtmr1, respectively */
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{ .mr_value = &sample_report.rtmr0,
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TSM_MR_(rtmr_crypto_agile, SHA256) | TSM_MR_F_RTMR },
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{ .mr_value = &sample_report.rtmr1,
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TSM_MR_(rtmr_crypto_agile, SHA384) | TSM_MR_F_RTMR },
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/* sha512 digest of the whole structure */
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{ MR_(report_digest, SHA512) | TSM_MR_F_LIVE },
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};
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#undef MR_
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static struct tsm_measurements sample_tm = {
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.mrs = sample_mrs,
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.nr_mrs = ARRAY_SIZE(sample_mrs),
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.refresh = sample_report_refresh,
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.write = sample_report_extend_mr,
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};
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static const struct attribute_group *sample_groups[] = {
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NULL,
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NULL,
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};
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static struct miscdevice sample_misc_dev = {
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.name = KBUILD_MODNAME,
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.minor = MISC_DYNAMIC_MINOR,
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.groups = sample_groups,
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};
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static int __init tsm_mr_sample_init(void)
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{
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int rc;
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sample_groups[0] = tsm_mr_create_attribute_group(&sample_tm);
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if (IS_ERR(sample_groups[0]))
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return PTR_ERR(sample_groups[0]);
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rc = misc_register(&sample_misc_dev);
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if (rc)
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tsm_mr_free_attribute_group(sample_groups[0]);
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return rc;
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}
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static void __exit tsm_mr_sample_exit(void)
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{
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misc_deregister(&sample_misc_dev);
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tsm_mr_free_attribute_group(sample_groups[0]);
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}
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module_init(tsm_mr_sample_init);
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module_exit(tsm_mr_sample_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Sample module using tsm-mr to expose emulated MRs");
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