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82fe7932e8
This patch converts IMA and EVM to use the LSM frameworks's initcall mechanism. It moved the integrity_fs_init() call to ima_fs_init() and evm_init_secfs(), to work around the fact that there is no "integrity" LSM, and introduced integrity_fs_fini() to remove the integrity directory, if empty. Both integrity_fs_init() and integrity_fs_fini() support the scenario of being called by both the IMA and EVM LSMs. This patch does not touch any of the platform certificate code that lives under the security/integrity/platform_certs directory as the IMA/EVM developers would prefer to address that in a future patchset. Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> Acked-by: Mimi Zohar <zohar@linux.ibm.com> [PM: adjust description as discussed over email] Signed-off-by: Paul Moore <paul@paul-moore.com>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2008 IBM Corporation
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*
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* Authors:
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* Mimi Zohar <zohar@us.ibm.com>
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*
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* File: integrity_iint.c
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* - initialize the integrity directory in securityfs
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* - load IMA and EVM keys
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*/
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#include <linux/security.h>
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#include "integrity.h"
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struct dentry *integrity_dir;
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/*
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* integrity_kernel_read - read data from the file
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*
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* This is a function for reading file content instead of kernel_read().
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* It does not perform locking checks to ensure it cannot be blocked.
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* It does not perform security checks because it is irrelevant for IMA.
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*
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*/
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int integrity_kernel_read(struct file *file, loff_t offset,
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void *addr, unsigned long count)
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{
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return __kernel_read(file, addr, count, &offset);
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}
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/*
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* integrity_load_keys - load integrity keys hook
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*
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* Hooks is called from init/main.c:kernel_init_freeable()
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* when rootfs is ready
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*/
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void __init integrity_load_keys(void)
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{
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ima_load_x509();
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if (!IS_ENABLED(CONFIG_IMA_LOAD_X509))
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evm_load_x509();
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}
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int __init integrity_fs_init(void)
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{
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if (integrity_dir)
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return 0;
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integrity_dir = securityfs_create_dir("integrity", NULL);
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if (IS_ERR(integrity_dir)) {
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int ret = PTR_ERR(integrity_dir);
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if (ret != -ENODEV)
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pr_err("Unable to create integrity sysfs dir: %d\n",
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ret);
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integrity_dir = NULL;
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return ret;
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}
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return 0;
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}
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void __init integrity_fs_fini(void)
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{
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if (!integrity_dir || !simple_empty(integrity_dir))
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return;
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securityfs_remove(integrity_dir);
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integrity_dir = NULL;
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}
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