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-rw-r--r--security/integrity/iint.c2
-rw-r--r--security/integrity/ima/ima_api.c57
-rw-r--r--security/integrity/ima/ima_appraise.c16
-rw-r--r--security/integrity/integrity.h4
4 files changed, 49 insertions, 30 deletions
diff --git a/security/integrity/iint.c b/security/integrity/iint.c
index 74522dbd10a6..c49d3f14cbec 100644
--- a/security/integrity/iint.c
+++ b/security/integrity/iint.c
@@ -70,6 +70,8 @@ struct integrity_iint_cache *integrity_iint_find(struct inode *inode)
static void iint_free(struct integrity_iint_cache *iint)
{
+ kfree(iint->ima_hash);
+ iint->ima_hash = NULL;
iint->version = 0;
iint->flags = 0UL;
iint->ima_file_status = INTEGRITY_UNKNOWN;
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 1dba98e2d7e9..5a7942e20814 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -44,7 +44,10 @@ int ima_store_template(struct ima_template_entry *entry,
const char *op = "add_template_measure";
const char *audit_cause = "hashing_error";
int result;
- struct ima_digest_data hash;
+ struct {
+ struct ima_digest_data hdr;
+ char digest[IMA_MAX_DIGEST_SIZE];
+ } hash;
memset(entry->digest, 0, sizeof(entry->digest));
entry->template_name = IMA_TEMPLATE_NAME;
@@ -52,14 +55,14 @@ int ima_store_template(struct ima_template_entry *entry,
if (!violation) {
result = ima_calc_buffer_hash(&entry->template,
- entry->template_len, &hash);
+ entry->template_len, &hash.hdr);
if (result < 0) {
integrity_audit_msg(AUDIT_INTEGRITY_PCR, inode,
entry->template_name, op,
audit_cause, result, 0);
return result;
}
- memcpy(entry->digest, hash.digest, hash.length);
+ memcpy(entry->digest, hash.hdr.digest, hash.hdr.length);
}
result = ima_add_template_entry(entry, violation, op, inode);
return result;
@@ -146,6 +149,10 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
struct inode *inode = file_inode(file);
const char *filename = file->f_dentry->d_name.name;
int result = 0;
+ struct {
+ struct ima_digest_data hdr;
+ char digest[IMA_MAX_DIGEST_SIZE];
+ } hash;
if (xattr_value)
*xattr_len = ima_read_xattr(file->f_dentry, xattr_value);
@@ -154,16 +161,23 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
u64 i_version = file_inode(file)->i_version;
/* use default hash algorithm */
- iint->ima_hash.algo = ima_hash_algo;
+ hash.hdr.algo = ima_hash_algo;
if (xattr_value)
- ima_get_hash_algo(*xattr_value, *xattr_len,
- &iint->ima_hash);
+ ima_get_hash_algo(*xattr_value, *xattr_len, &hash.hdr);
- result = ima_calc_file_hash(file, &iint->ima_hash);
+ result = ima_calc_file_hash(file, &hash.hdr);
if (!result) {
- iint->version = i_version;
- iint->flags |= IMA_COLLECTED;
+ int length = sizeof(hash.hdr) + hash.hdr.length;
+ void *tmpbuf = krealloc(iint->ima_hash, length,
+ GFP_NOFS);
+ if (tmpbuf) {
+ iint->ima_hash = tmpbuf;
+ memcpy(iint->ima_hash, &hash, length);
+ iint->version = i_version;
+ iint->flags |= IMA_COLLECTED;
+ } else
+ result = -ENOMEM;
}
}
if (result)
@@ -208,21 +222,24 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
return;
}
memset(&entry->template, 0, sizeof(entry->template));
- if (iint->ima_hash.algo != ima_hash_algo) {
- struct ima_digest_data hash;
+ if (iint->ima_hash->algo != ima_hash_algo) {
+ struct {
+ struct ima_digest_data hdr;
+ char digest[IMA_MAX_DIGEST_SIZE];
+ } hash;
- hash.algo = ima_hash_algo;
- result = ima_calc_file_hash(file, &hash);
+ hash.hdr.algo = ima_hash_algo;
+ result = ima_calc_file_hash(file, &hash.hdr);
if (result)
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
filename, "collect_data", "failed",
result, 0);
else
- memcpy(entry->template.digest, hash.digest,
- hash.length);
+ memcpy(entry->template.digest, hash.hdr.digest,
+ hash.hdr.length);
} else
- memcpy(entry->template.digest, iint->ima_hash.digest,
- iint->ima_hash.length);
+ memcpy(entry->template.digest, iint->ima_hash->digest,
+ iint->ima_hash->length);
strcpy(entry->template.file_name,
(strlen(filename) > IMA_EVENT_NAME_LEN_MAX) ?
file->f_dentry->d_name.name : filename);
@@ -238,14 +255,14 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
const unsigned char *filename)
{
struct audit_buffer *ab;
- char hash[(iint->ima_hash.length * 2) + 1];
+ char hash[(iint->ima_hash->length * 2) + 1];
int i;
if (iint->flags & IMA_AUDITED)
return;
- for (i = 0; i < iint->ima_hash.length; i++)
- hex_byte_pack(hash + (i * 2), iint->ima_hash.digest[i]);
+ for (i = 0; i < iint->ima_hash->length; i++)
+ hex_byte_pack(hash + (i * 2), iint->ima_hash->digest[i]);
hash[i * 2] = '\0';
ab = audit_log_start(current->audit_context, GFP_KERNEL,
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index e1865a6e80ec..116630ca5ff3 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -45,10 +45,10 @@ int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
static int ima_fix_xattr(struct dentry *dentry,
struct integrity_iint_cache *iint)
{
- iint->ima_hash.type = IMA_XATTR_DIGEST;
+ iint->ima_hash->type = IMA_XATTR_DIGEST;
return __vfs_setxattr_noperm(dentry, XATTR_NAME_IMA,
- &iint->ima_hash.type,
- 1 + iint->ima_hash.length, 0);
+ &iint->ima_hash->type,
+ 1 + iint->ima_hash->length, 0);
}
/* Return specific func appraised cached result */
@@ -186,13 +186,13 @@ int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
status = INTEGRITY_FAIL;
break;
}
- if (xattr_len - 1 >= iint->ima_hash.length)
+ if (xattr_len - 1 >= iint->ima_hash->length)
/* xattr length may be longer. md5 hash in previous
version occupied 20 bytes in xattr, instead of 16
*/
rc = memcmp(xattr_value->digest,
- iint->ima_hash.digest,
- iint->ima_hash.length);
+ iint->ima_hash->digest,
+ iint->ima_hash->length);
else
rc = -EINVAL;
if (rc) {
@@ -206,8 +206,8 @@ int ima_appraise_measurement(int func, struct integrity_iint_cache *iint,
iint->flags |= IMA_DIGSIG;
rc = integrity_digsig_verify(INTEGRITY_KEYRING_IMA,
(const char *)xattr_value, rc,
- iint->ima_hash.digest,
- iint->ima_hash.length);
+ iint->ima_hash->digest,
+ iint->ima_hash->length);
if (rc == -EOPNOTSUPP) {
status = INTEGRITY_UNKNOWN;
} else if (rc) {
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index aead6b2b5488..5429ca59125b 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -67,7 +67,7 @@ struct ima_digest_data {
u8 algo;
u8 length;
u8 type;
- u8 digest[IMA_MAX_DIGEST_SIZE];
+ u8 digest[0];
} __packed;
/*
@@ -93,7 +93,7 @@ struct integrity_iint_cache {
enum integrity_status ima_bprm_status:4;
enum integrity_status ima_module_status:4;
enum integrity_status evm_status:4;
- struct ima_digest_data ima_hash;
+ struct ima_digest_data *ima_hash;
};
/* rbtree tree calls to lookup, insert, delete
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 10:09:11 +0000