diff options
Diffstat (limited to 'security/integrity/ima')
-rw-r--r-- | security/integrity/ima/ima.h | 1 | ||||
-rw-r--r-- | security/integrity/ima/ima_crypto.c | 10 | ||||
-rw-r--r-- | security/integrity/ima/ima_init.c | 4 | ||||
-rw-r--r-- | security/integrity/ima/ima_main.c | 35 | ||||
-rw-r--r-- | security/integrity/ima/ima_queue.c | 27 |
5 files changed, 69 insertions, 8 deletions
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index 026163f37ba1..d213e835c498 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -153,6 +153,7 @@ int ima_measurements_show(struct seq_file *m, void *v); unsigned long ima_get_binary_runtime_size(void); int ima_init_template(void); void ima_init_template_list(void); +int __init ima_init_digests(void); /* * used to protect h_table and sha_table diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c index acf2c7df7145..16a4f45863b1 100644 --- a/security/integrity/ima/ima_crypto.c +++ b/security/integrity/ima/ima_crypto.c @@ -643,12 +643,12 @@ int ima_calc_buffer_hash(const void *buf, loff_t len, return calc_buffer_shash(buf, len, hash); } -static void __init ima_pcrread(u32 idx, u8 *pcr) +static void __init ima_pcrread(u32 idx, struct tpm_digest *d) { if (!ima_tpm_chip) return; - if (tpm_pcr_read(ima_tpm_chip, idx, pcr) != 0) + if (tpm_pcr_read(ima_tpm_chip, idx, d) != 0) pr_err("Error Communicating to TPM chip\n"); } @@ -658,7 +658,7 @@ static void __init ima_pcrread(u32 idx, u8 *pcr) static int __init ima_calc_boot_aggregate_tfm(char *digest, struct crypto_shash *tfm) { - u8 pcr_i[TPM_DIGEST_SIZE]; + struct tpm_digest d = { .alg_id = TPM_ALG_SHA1, .digest = {0} }; int rc; u32 i; SHASH_DESC_ON_STACK(shash, tfm); @@ -672,9 +672,9 @@ static int __init ima_calc_boot_aggregate_tfm(char *digest, /* cumulative sha1 over tpm registers 0-7 */ for (i = TPM_PCR0; i < TPM_PCR8; i++) { - ima_pcrread(i, pcr_i); + ima_pcrread(i, &d); /* now accumulate with current aggregate */ - rc = crypto_shash_update(shash, pcr_i, TPM_DIGEST_SIZE); + rc = crypto_shash_update(shash, d.digest, TPM_DIGEST_SIZE); } if (!rc) crypto_shash_final(shash, digest); diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c index 6bb42a9c5e47..6c9295449751 100644 --- a/security/integrity/ima/ima_init.c +++ b/security/integrity/ima/ima_init.c @@ -123,8 +123,12 @@ int __init ima_init(void) if (rc != 0) return rc; + /* It can be called before ima_init_digests(), it does not use TPM. */ ima_load_kexec_buffer(); + rc = ima_init_digests(); + if (rc != 0) + return rc; rc = ima_add_boot_aggregate(); /* boot aggregate must be first entry */ if (rc != 0) return rc; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 4ffac4f5c647..357edd140c09 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -397,6 +397,33 @@ int ima_file_check(struct file *file, int mask) EXPORT_SYMBOL_GPL(ima_file_check); /** + * ima_post_create_tmpfile - mark newly created tmpfile as new + * @file : newly created tmpfile + * + * No measuring, appraising or auditing of newly created tmpfiles is needed. + * Skip calling process_measurement(), but indicate which newly, created + * tmpfiles are in policy. + */ +void ima_post_create_tmpfile(struct inode *inode) +{ + struct integrity_iint_cache *iint; + int must_appraise; + + must_appraise = ima_must_appraise(inode, MAY_ACCESS, FILE_CHECK); + if (!must_appraise) + return; + + /* Nothing to do if we can't allocate memory */ + iint = integrity_inode_get(inode); + if (!iint) + return; + + /* needed for writing the security xattrs */ + set_bit(IMA_UPDATE_XATTR, &iint->atomic_flags); + iint->ima_file_status = INTEGRITY_PASS; +} + +/** * ima_post_path_mknod - mark as a new inode * @dentry: newly created dentry * @@ -413,9 +440,13 @@ void ima_post_path_mknod(struct dentry *dentry) if (!must_appraise) return; + /* Nothing to do if we can't allocate memory */ iint = integrity_inode_get(inode); - if (iint) - iint->flags |= IMA_NEW_FILE; + if (!iint) + return; + + /* needed for re-opening empty files */ + iint->flags |= IMA_NEW_FILE; } /** diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c index 0e41dc1df1d4..6b6d044e0440 100644 --- a/security/integrity/ima/ima_queue.c +++ b/security/integrity/ima/ima_queue.c @@ -27,6 +27,9 @@ #define AUDIT_CAUSE_LEN_MAX 32 +/* pre-allocated array of tpm_digest structures to extend a PCR */ +static struct tpm_digest *digests; + LIST_HEAD(ima_measurements); /* list of all measurements */ #ifdef CONFIG_IMA_KEXEC static unsigned long binary_runtime_size; @@ -140,11 +143,15 @@ unsigned long ima_get_binary_runtime_size(void) static int ima_pcr_extend(const u8 *hash, int pcr) { int result = 0; + int i; if (!ima_tpm_chip) return result; - result = tpm_pcr_extend(ima_tpm_chip, pcr, hash); + for (i = 0; i < ima_tpm_chip->nr_allocated_banks; i++) + memcpy(digests[i].digest, hash, TPM_DIGEST_SIZE); + + result = tpm_pcr_extend(ima_tpm_chip, pcr, digests); if (result != 0) pr_err("Error Communicating to TPM chip, result: %d\n", result); return result; @@ -211,3 +218,21 @@ int ima_restore_measurement_entry(struct ima_template_entry *entry) mutex_unlock(&ima_extend_list_mutex); return result; } + +int __init ima_init_digests(void) +{ + int i; + + if (!ima_tpm_chip) + return 0; + + digests = kcalloc(ima_tpm_chip->nr_allocated_banks, sizeof(*digests), + GFP_NOFS); + if (!digests) + return -ENOMEM; + + for (i = 0; i < ima_tpm_chip->nr_allocated_banks; i++) + digests[i].alg_id = ima_tpm_chip->allocated_banks[i].alg_id; + + return 0; +} |