From a7ed7c60e14df5b986f93549717235b882643e7e Mon Sep 17 00:00:00 2001
From: Roberto Sassu <roberto.sassu@polito.it>
Date: Mon, 2 Dec 2013 19:40:34 +0100
Subject: [PATCH] ima: properly free ima_template_entry structures
The new templates management mechanism records information associated
to an event into an array of 'ima_field_data' structures and makes it
available through the 'template_data' field of the 'ima_template_entry'
structure (the element of the measurements list created by IMA).
Since 'ima_field_data' contains dynamically allocated data (which length
varies depending on the data associated to a selected template field),
it is not enough to just free the memory reserved for a
'ima_template_entry' structure if something goes wrong.
This patch creates the new function ima_free_template_entry() which
walks the array of 'ima_field_data' structures, frees the memory
referenced by the 'data' pointer and finally the space reserved for
the 'ima_template_entry' structure. Further, it replaces existing kfree()
that have a pointer to an 'ima_template_entry' structure as argument
with calls to the new function.
Fixes: a71dc65: ima: switch to new template management mechanism
Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
---
security/integrity/ima/ima.h | 1 +
security/integrity/ima/ima_api.c | 21 +++++++++++++++++----
security/integrity/ima/ima_init.c | 2 +-
3 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 9636e17c9f5d..0356e1d437ca 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -148,6 +148,7 @@ int ima_alloc_init_template(struct integrity_iint_cache *iint,
int xattr_len, struct ima_template_entry **entry);
int ima_store_template(struct ima_template_entry *entry, int violation,
struct inode *inode, const unsigned char *filename);
+void ima_free_template_entry(struct ima_template_entry *entry);
const char *ima_d_path(struct path *path, char **pathbuf);
/* rbtree tree calls to lookup, insert, delete
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 80374842fe0b..c38bbce8c6a6 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -21,6 +21,19 @@
#include <crypto/hash_info.h>
#include "ima.h"
+/*
+ * ima_free_template_entry - free an existing template entry
+ */
+void ima_free_template_entry(struct ima_template_entry *entry)
+{
+ int i;
+
+ for (i = 0; i < entry->template_desc->num_fields; i++)
+ kfree(entry->template_data[i].data);
+
+ kfree(entry);
+}
+
/*
* ima_alloc_init_template - create and initialize a new template entry
*/
@@ -37,6 +50,7 @@ int ima_alloc_init_template(struct integrity_iint_cache *iint,
if (!*entry)
return -ENOMEM;
+ (*entry)->template_desc = template_desc;
for (i = 0; i < template_desc->num_fields; i++) {
struct ima_template_field *field = template_desc->fields[i];
u32 len;
@@ -51,10 +65,9 @@ int ima_alloc_init_template(struct integrity_iint_cache *iint,
(*entry)->template_data_len += sizeof(len);
(*entry)->template_data_len += len;
}
- (*entry)->template_desc = template_desc;
return 0;
out:
- kfree(*entry);
+ ima_free_template_entry(*entry);
*entry = NULL;
return result;
}
@@ -134,7 +147,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
}
result = ima_store_template(entry, violation, inode, filename);
if (result < 0)
- kfree(entry);
+ ima_free_template_entry(entry);
err_out:
integrity_audit_msg(AUDIT_INTEGRITY_PCR, inode, filename,
op, cause, result, 0);
@@ -269,7 +282,7 @@ void ima_store_measurement(struct integrity_iint_cache *iint,
if (!result || result == -EEXIST)
iint->flags |= IMA_MEASURED;
if (result < 0)
- kfree(entry);
+ ima_free_template_entry(entry);
}
void ima_audit_measurement(struct integrity_iint_cache *iint,
diff --git a/security/integrity/ima/ima_init.c b/security/integrity/ima/ima_init.c
index 76b8e2c4fd38..37122768554a 100644
--- a/security/integrity/ima/ima_init.c
+++ b/security/integrity/ima/ima_init.c
@@ -75,7 +75,7 @@ static void __init ima_add_boot_aggregate(void)
result = ima_store_template(entry, violation, NULL,
boot_aggregate_name);
if (result < 0)
- kfree(entry);
+ ima_free_template_entry(entry);
return;
err_out:
integrity_audit_msg(AUDIT_INTEGRITY_PCR, NULL, boot_aggregate_name, op,
--
2.20.1