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ima: drop vla in ima_audit_measurement()

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In keeping with the directive to get rid of VLAs [1], let's drop the VLA
from ima_audit_measurement(). We need to adjust the return type of
ima_audit_measurement, because now this function can fail if an allocation
fails.

[1]: https://lkml.org/lkml/2018/3/7/621

v2: just use audit_log_format instead of doing a second allocation
v3: ignore failures in ima_audit_measurement()

Signed-off-by: Tycho Andersen <tycho@tycho.ws>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Tycho Andersen 2018-03-08 16:08:36 -07:00 committed by Mimi Zohar
parent fac37c628f
commit e456ef88ae
1 changed files with 10 additions and 6 deletions
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16
security/integrity/ima/ima_api.c
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@ -311,14 +311,17 @@ 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;
const char *algo_name = hash_algo_name[iint->ima_hash->algo];
char algo_hash[sizeof(hash) + strlen(algo_name) + 2];
int i;
if (iint->flags & IMA_AUDITED)
return;
hash = kzalloc((iint->ima_hash->length * 2) + 1, GFP_KERNEL);
if (!hash)
return;
for (i = 0; i < iint->ima_hash->length; i++)
hex_byte_pack(hash + (i * 2), iint->ima_hash->digest[i]);
hash[i * 2] = '\0';
@ -326,18 +329,19 @@ void ima_audit_measurement(struct integrity_iint_cache *iint,
ab = audit_log_start(current->audit_context, GFP_KERNEL,
AUDIT_INTEGRITY_RULE);
if (!ab)
return;
goto out;
audit_log_format(ab, "file=");
audit_log_untrustedstring(ab, filename);
audit_log_format(ab, " hash=");
snprintf(algo_hash, sizeof(algo_hash), "%s:%s", algo_name, hash);
audit_log_untrustedstring(ab, algo_hash);
audit_log_format(ab, " hash=\"%s:%s\"", algo_name, hash);
audit_log_task_info(ab, current);
audit_log_end(ab);
iint->flags |= IMA_AUDITED;
out:
kfree(hash);
return;
}
/*