<snip>
void process_buffer_measurement(struct inode *inode, const void
*buf, int size,
const char *eventname, enum ima_hooks func,
- int pcr, const char *func_data);
+ int pcr, const char *func_data,
+ bool measure_buf_hash);
Please abbreviate the boolean name to "hash". The test would then be
"if (hash == true)" or "if (hash)".
Will do.
<snip>
- * process_buffer_measurement - Measure the buffer to ima log.
+ * process_buffer_measurement - Measure the buffer or the buffer
data hash
* @inode: inode associated with the object being measured (NULL
for KEY_CHECK)
* @buf: pointer to the buffer that needs to be added to the log.
* @size: size of buffer(in bytes).
@@ -787,12 +787,23 @@ int ima_post_load_data(char *buf, loff_t size,
* @func: IMA hook
* @pcr: pcr to extend the measurement
* @func_data: private data specific to @func, can be NULL.
+ * @measure_buf_hash: measure buffer hash
^@hash: measure buffer data hash
Agreed. Will fix.
<snip>
void process_buffer_measurement(struct inode *inode, const void
*buf, int size,
const char *eventname, enum ima_hooks func,
- int pcr, const char *func_data)
+ int pcr, const char *func_data,
+ bool measure_buf_hash)
{
int ret = 0;
const char *audit_cause = "ENOMEM";
@@ -807,6 +818,8 @@ void process_buffer_measurement(struct inode
*inode, const void *buf, int size,
struct ima_digest_data hdr;
char digest[IMA_MAX_DIGEST_SIZE];
} hash = {};
+ char buf_hash[IMA_MAX_DIGEST_SIZE];
+ int buf_hash_len = hash_digest_size[ima_hash_algo];
int violation = 0;
int action = 0;
u32 secid;
@@ -849,13 +862,27 @@ void process_buffer_measurement(struct inode
*inode, const void *buf, int size,
goto out;
}
+ if (measure_buf_hash) {
^ if (hash) {
Yes.
+ memcpy(buf_hash, hash.hdr.digest, buf_hash_len);
+
+ ret = ima_calc_buffer_hash(buf_hash, buf_hash_len,
+ iint.ima_hash);
+ if (ret < 0) {
+ audit_cause = "measure_buf_hash_error";
Hi Mimi,
There already exist a local struct variable named "hash" in p_b_m().
I was thinking of using "buf_hash", but that one is taken too.
Maybe I should use "buf_hash" for the input bool, and rename the
existing "buf_hash" local variable to "digest_hash"?
Does it sound ok?
Thanks,
Tushar
<snip>
