1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2024 Microsoft Corporation. All rights reserved. 4 */ 5 #include <uapi/linux/lsm.h> 6 7 #include "ipe.h" 8 #include "eval.h" 9 #include "hooks.h" 10 11 extern const char *const ipe_boot_policy; 12 bool ipe_enabled; 13 14 static struct lsm_blob_sizes ipe_blobs __ro_after_init = { 15 .lbs_superblock = sizeof(struct ipe_superblock), 16 #ifdef CONFIG_IPE_PROP_DM_VERITY 17 .lbs_bdev = sizeof(struct ipe_bdev), 18 #endif /* CONFIG_IPE_PROP_DM_VERITY */ 19 #ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG 20 .lbs_inode = sizeof(struct ipe_inode), 21 #endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */ 22 }; 23 24 static const struct lsm_id ipe_lsmid = { 25 .name = "ipe", 26 .id = LSM_ID_IPE, 27 }; 28 29 struct ipe_superblock *ipe_sb(const struct super_block *sb) 30 { 31 return sb->s_security + ipe_blobs.lbs_superblock; 32 } 33 34 #ifdef CONFIG_IPE_PROP_DM_VERITY 35 struct ipe_bdev *ipe_bdev(struct block_device *b) 36 { 37 return b->bd_security + ipe_blobs.lbs_bdev; 38 } 39 #endif /* CONFIG_IPE_PROP_DM_VERITY */ 40 41 #ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG 42 struct ipe_inode *ipe_inode(const struct inode *inode) 43 { 44 return inode->i_security + ipe_blobs.lbs_inode; 45 } 46 #endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */ 47 48 static struct security_hook_list ipe_hooks[] __ro_after_init = { 49 LSM_HOOK_INIT(bprm_check_security, ipe_bprm_check_security), 50 LSM_HOOK_INIT(mmap_file, ipe_mmap_file), 51 LSM_HOOK_INIT(file_mprotect, ipe_file_mprotect), 52 LSM_HOOK_INIT(kernel_read_file, ipe_kernel_read_file), 53 LSM_HOOK_INIT(kernel_load_data, ipe_kernel_load_data), 54 LSM_HOOK_INIT(initramfs_populated, ipe_unpack_initramfs), 55 #ifdef CONFIG_IPE_PROP_DM_VERITY 56 LSM_HOOK_INIT(bdev_free_security, ipe_bdev_free_security), 57 LSM_HOOK_INIT(bdev_setintegrity, ipe_bdev_setintegrity), 58 #endif /* CONFIG_IPE_PROP_DM_VERITY */ 59 #ifdef CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG 60 LSM_HOOK_INIT(inode_setintegrity, ipe_inode_setintegrity), 61 #endif /* CONFIG_IPE_PROP_FS_VERITY_BUILTIN_SIG */ 62 }; 63 64 /** 65 * ipe_init() - Entry point of IPE. 66 * 67 * This is called at LSM init, which happens occurs early during kernel 68 * start up. During this phase, IPE registers its hooks and loads the 69 * builtin boot policy. 70 * 71 * Return: 72 * * %0 - OK 73 * * %-ENOMEM - Out of memory (OOM) 74 */ 75 static int __init ipe_init(void) 76 { 77 struct ipe_policy *p = NULL; 78 79 security_add_hooks(ipe_hooks, ARRAY_SIZE(ipe_hooks), &ipe_lsmid); 80 ipe_enabled = true; 81 82 if (ipe_boot_policy) { 83 p = ipe_new_policy(ipe_boot_policy, strlen(ipe_boot_policy), 84 NULL, 0); 85 if (IS_ERR(p)) 86 return PTR_ERR(p); 87 88 rcu_assign_pointer(ipe_active_policy, p); 89 } 90 91 return 0; 92 } 93 94 DEFINE_LSM(ipe) = { 95 .name = "ipe", 96 .init = ipe_init, 97 .blobs = &ipe_blobs, 98 }; 99