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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved.
*/
#include <uapi/linux/lsm.h>
#include "ipe.h"
#include "eval.h"
#include "hooks.h"
extern const char *const ipe_boot_policy;
bool ipe_enabled;
static struct lsm_blob_sizes ipe_blobs __ro_after_init = {
.lbs_superblock = sizeof(struct ipe_superblock),
#ifdef CONFIG_IPE_PROP_DM_VERITY
.lbs_bdev = sizeof(struct ipe_bdev),
#endif /* CONFIG_IPE_PROP_DM_VERITY */
#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
.lbs_inode = sizeof(struct ipe_inode),
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
};
static const struct lsm_id ipe_lsmid = {
.name = "ipe",
.id = LSM_ID_IPE,
};
struct ipe_superblock *ipe_sb(const struct super_block *sb)
{
return sb->s_security + ipe_blobs.lbs_superblock;
}
#ifdef CONFIG_IPE_PROP_DM_VERITY
struct ipe_bdev *ipe_bdev(struct block_device *b)
{
return b->bd_security + ipe_blobs.lbs_bdev;
}
#endif /* CONFIG_IPE_PROP_DM_VERITY */
#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
struct ipe_inode *ipe_inode(const struct inode *inode)
{
return inode->i_security + ipe_blobs.lbs_inode;
}
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
static struct security_hook_list ipe_hooks[] __ro_after_init = {
LSM_HOOK_INIT(bprm_check_security, ipe_bprm_check_security),
LSM_HOOK_INIT(mmap_file, ipe_mmap_file),
LSM_HOOK_INIT(file_mprotect, ipe_file_mprotect),
LSM_HOOK_INIT(kernel_read_file, ipe_kernel_read_file),
LSM_HOOK_INIT(kernel_load_data, ipe_kernel_load_data),
LSM_HOOK_INIT(initramfs_populated, ipe_unpack_initramfs),
#ifdef CONFIG_IPE_PROP_DM_VERITY
LSM_HOOK_INIT(bdev_free_security, ipe_bdev_free_security),
LSM_HOOK_INIT(bdev_setintegrity, ipe_bdev_setintegrity),
#endif /* CONFIG_IPE_PROP_DM_VERITY */
#ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG
LSM_HOOK_INIT(inode_setintegrity, ipe_inode_setintegrity),
#endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */
};
/**
* ipe_init() - Entry point of IPE.
*
* This is called at LSM init, which happens occurs early during kernel
* start up. During this phase, IPE registers its hooks and loads the
* builtin boot policy.
*
* Return:
* * %0 - OK
* * %-ENOMEM - Out of memory (OOM)
*/
static int __init ipe_init(void)
{
struct ipe_policy *p = NULL;
security_add_hooks(ipe_hooks, ARRAY_SIZE(ipe_hooks), &ipe_lsmid);
ipe_enabled = true;
if (ipe_boot_policy) {
p = ipe_new_policy(ipe_boot_policy, strlen(ipe_boot_policy),
NULL, 0);
if (IS_ERR(p))
return PTR_ERR(p);
rcu_assign_pointer(ipe_active_policy, p);
}
return 0;
}
DEFINE_LSM(ipe) = {
.name = "ipe",
.init = ipe_init,
.blobs = &ipe_blobs,
};
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