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-rw-r--r--security/integrity/ima/ima_main.c29
1 files changed, 24 insertions, 5 deletions
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 0c645699c7fb..250e52114230 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -809,7 +809,7 @@ int ima_post_load_data(char *buf, loff_t size,
}
/*
- * 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).
@@ -817,12 +817,14 @@ int ima_post_load_data(char *buf, loff_t size,
* @func: IMA hook
* @pcr: pcr to extend the measurement
* @func_data: func specific data, may be NULL
+ * @buf_hash: measure buffer data hash
*
- * Based on policy, the buffer is measured into the ima log.
+ * Based on policy, either the buffer data or buffer data hash is measured
*/
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 buf_hash)
{
int ret = 0;
const char *audit_cause = "ENOMEM";
@@ -837,6 +839,8 @@ 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 digest_hash[IMA_MAX_DIGEST_SIZE];
+ int digest_hash_len = hash_digest_size[ima_hash_algo];
int violation = 0;
int action = 0;
u32 secid;
@@ -879,13 +883,27 @@ void process_buffer_measurement(struct inode *inode, const void *buf, int size,
goto out;
}
+ if (buf_hash) {
+ memcpy(digest_hash, hash.hdr.digest, digest_hash_len);
+
+ ret = ima_calc_buffer_hash(digest_hash, digest_hash_len,
+ iint.ima_hash);
+ if (ret < 0) {
+ audit_cause = "hashing_error";
+ goto out;
+ }
+
+ event_data.buf = digest_hash;
+ event_data.buf_len = digest_hash_len;
+ }
+
ret = ima_alloc_init_template(&event_data, &entry, template);
if (ret < 0) {
audit_cause = "alloc_entry";
goto out;
}
- ret = ima_store_template(entry, violation, NULL, buf, pcr);
+ ret = ima_store_template(entry, violation, NULL, event_data.buf, pcr);
if (ret < 0) {
audit_cause = "store_entry";
ima_free_template_entry(entry);
@@ -920,7 +938,8 @@ void ima_kexec_cmdline(int kernel_fd, const void *buf, int size)
return;
process_buffer_measurement(file_inode(f.file), buf, size,
- "kexec-cmdline", KEXEC_CMDLINE, 0, NULL);
+ "kexec-cmdline", KEXEC_CMDLINE, 0, NULL,
+ false);
fdput(f);
}