| 1 | |
| 2 | |
| 3 | * Landlock LSM - Security framework setup
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| 4 | *
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| 5 | * Copyright © 2016-2020 Mickaël Salaün <[email protected]>
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| 6 | * Copyright © 2018-2020 ANSSI
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| 7 |
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| 8 |
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| 9 | #include <linux/bits.h>
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| 10 | #include <linux/init.h>
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| 11 | #include <linux/lsm_hooks.h>
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| 12 | #include <uapi/linux/lsm.h>
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| 13 |
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| 14 | #include "common.h"
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| 15 | #include "cred.h"
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| 16 | #include "errata.h"
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| 17 | #include "fs.h"
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| 18 | #include "id.h"
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| 19 | #include "net.h"
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| 20 | #include "setup.h"
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| 21 | #include "task.h"
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| 22 |
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| 23 | bool landlock_initialized __ro_after_init = false;
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| 24 |
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| 25 | const struct lsm_id landlock_lsmid = {
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| 26 | .name = LANDLOCK_NAME,
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| 27 | .id = LSM_ID_LANDLOCK,
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| 28 | };
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| 29 |
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| 30 | struct lsm_blob_sizes landlock_blob_sizes __ro_after_init = {
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| 31 | .lbs_cred = sizeof(struct landlock_cred_security),
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| 32 | .lbs_file = sizeof(struct landlock_file_security),
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| 33 | .lbs_inode = sizeof(struct landlock_inode_security),
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| 34 | .lbs_superblock = sizeof(struct landlock_superblock_security),
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| 35 | };
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| 36 |
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| 37 | int landlock_errata __ro_after_init;
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| 38 |
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| 39 | static void __init compute_errata(void)
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| 40 | {
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| 41 | size_t i;
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| 42 |
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| 43 | #ifndef __has_include
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| 44 | |
| 45 | * This is a safeguard to make sure the compiler implements
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| 46 | * __has_include (see errata.h).
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| 47 |
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| 48 | WARN_ON_ONCE(1);
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| 49 | return;
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| 50 | #endif
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| 51 |
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| 52 | for (i = 0; landlock_errata_init[i].number; i++) {
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| 53 | const int prev_errata = landlock_errata;
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| 54 |
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| 55 | if (WARN_ON_ONCE(landlock_errata_init[i].abi >
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| 56 | landlock_abi_version))
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| 57 | continue;
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| 58 |
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| 59 | landlock_errata |= BIT(landlock_errata_init[i].number - 1);
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| 60 | WARN_ON_ONCE(prev_errata == landlock_errata);
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| 61 | }
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| 62 | }
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| 63 |
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| 64 | static int __init landlock_init(void)
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| 65 | {
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| 66 | compute_errata();
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| 67 | landlock_add_cred_hooks();
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| 68 | landlock_add_task_hooks();
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| 69 | landlock_add_fs_hooks();
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| 70 | landlock_add_net_hooks();
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| 71 | landlock_init_id();
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| 72 | landlock_initialized = true;
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| 73 | pr_info("Up and running.\n");
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| 74 | return 0;
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| 75 | }
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| 76 |
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| 77 | DEFINE_LSM(LANDLOCK_NAME) = {
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| 78 | .id = &landlock_lsmid,
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| 79 | .init = landlock_init,
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| 80 | .blobs = &landlock_blob_sizes,
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| 81 | };
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