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authorDmitry Kasatkin <d.kasatkin@samsung.com>2013-06-07 12:16:25 +0200
committerMimi Zohar <zohar@linux.vnet.ibm.com>2013-10-25 17:17:02 -0400
commit09ef54359c4ad49c01a12503b2c510b424ecf059 (patch)
tree18911069d877f2ae821c040d5fc64339dffd03d7 /security/integrity
parentea593993d361748e795f5eb783a5fb5144fb2df9 (diff)
downloadlinux-stericsson-09ef54359c4ad49c01a12503b2c510b424ecf059.tar.gz
ima: ima_calc_boot_agregate must use SHA1
With multiple hash algorithms, ima_hash_tfm is no longer guaranteed to be sha1. Need to force to use sha1. Changelog: - pass ima_digest_data to ima_calc_boot_aggregate() instead of char * (Roberto Sassu); - create an ima_digest_data structure in ima_add_boot_aggregate() (Roberto Sassu); - pass hash->algo to ima_alloc_tfm() (Roberto Sassu, reported by Dmitry). - "move hash definition in ima_add_boot_aggregate()" commit hunk to here. - sparse warning fix - Fengguang Wu Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com> Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity')
-rw-r--r--security/integrity/ima/ima.h2
-rw-r--r--security/integrity/ima/ima_crypto.c24
-rw-r--r--security/integrity/ima/ima_init.c10
3 files changed, 31 insertions, 5 deletions
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 52393edfbfd9..e0e1cde6e674 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -73,7 +73,7 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation,
int ima_calc_file_hash(struct file *file, struct ima_digest_data *hash);
int ima_calc_buffer_hash(const void *data, int len,
struct ima_digest_data *hash);
-int ima_calc_boot_aggregate(char *digest);
+int __init ima_calc_boot_aggregate(struct ima_digest_data *hash);
void ima_add_violation(struct inode *inode, const unsigned char *filename,
const char *op, const char *cause);
int ima_init_crypto(void);
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index e2be2524a372..22be23f13b3d 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -184,16 +184,17 @@ static void __init ima_pcrread(int idx, u8 *pcr)
/*
* Calculate the boot aggregate hash
*/
-int __init ima_calc_boot_aggregate(char *digest)
+static int __init ima_calc_boot_aggregate_tfm(char *digest,
+ struct crypto_shash *tfm)
{
u8 pcr_i[TPM_DIGEST_SIZE];
int rc, i;
struct {
struct shash_desc shash;
- char ctx[crypto_shash_descsize(ima_shash_tfm)];
+ char ctx[crypto_shash_descsize(tfm)];
} desc;
- desc.shash.tfm = ima_shash_tfm;
+ desc.shash.tfm = tfm;
desc.shash.flags = 0;
rc = crypto_shash_init(&desc.shash);
@@ -210,3 +211,20 @@ int __init ima_calc_boot_aggregate(char *digest)
crypto_shash_final(&desc.shash, digest);
return rc;
}
+
+int __init ima_calc_boot_aggregate(struct ima_digest_data *hash)
+{
+ struct crypto_shash *tfm;
+ int rc;
+
+ tfm = ima_alloc_tfm(hash->algo);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ hash->length = crypto_shash_digestsize(tfm);
+ rc = ima_calc_boot_aggregate_tfm(hash->digest, tfm);
+
+ ima_free_tfm(tfm);
+
+ return rc;
+}
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index 9d0243c10558..77cd5005f2db 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -18,6 +18,7 @@
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/err.h>
+#include <crypto/hash_info.h>
#include "ima.h"
/* name for boot aggregate entry */
@@ -46,6 +47,10 @@ static void __init ima_add_boot_aggregate(void)
const char *audit_cause = "ENOMEM";
int result = -ENOMEM;
int violation = 1;
+ struct {
+ struct ima_digest_data hdr;
+ char digest[TPM_DIGEST_SIZE];
+ } hash;
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
@@ -56,12 +61,15 @@ static void __init ima_add_boot_aggregate(void)
IMA_EVENT_NAME_LEN_MAX);
if (ima_used_chip) {
violation = 0;
- result = ima_calc_boot_aggregate(entry->template.digest);
+ hash.hdr.algo = HASH_ALGO_SHA1;
+ result = ima_calc_boot_aggregate(&hash.hdr);
if (result < 0) {
audit_cause = "hashing_error";
kfree(entry);
goto err_out;
}
+ memcpy(entry->template.digest, hash.hdr.digest,
+ hash.hdr.length);
}
result = ima_store_template(entry, violation, NULL);
if (result < 0)