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authorRoberto Sassu <roberto.sassu@polito.it>2014-02-03 16:56:05 +0400
committerMimi Zohar <zohar@linux.vnet.ibm.com>2014-03-07 20:32:30 +0400
commite3b64c268b485f578a498c2f6d5704ef54ab4432 (patch)
tree0612967837f6afe8b78da21d803146bbc1c8ddf6 /security/integrity/ima/ima_template_lib.c
parentc019e307ad82a8ee652b8ccbacf69ae94263b07b (diff)
downloadlinux-e3b64c268b485f578a498c2f6d5704ef54ab4432.tar.xz
ima: reduce memory usage when a template containing the n field is used
Before this change, to correctly calculate the template digest for the 'ima' template, the event name field (id: 'n') length was set to the fixed size of 256 bytes. This patch reduces the length of the event name field to the string length incremented of one (to make room for the termination character '\0') and handles the specific case of the digest calculation for the 'ima' template directly in ima_calc_field_array_hash_tfm(). Signed-off-by: Roberto Sassu <roberto.sassu@polito.it> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity/ima/ima_template_lib.c')
-rw-r--r--security/integrity/ima/ima_template_lib.c19
1 files changed, 4 insertions, 15 deletions
diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c
index e8592e7bfc21..1506f0248572 100644
--- a/security/integrity/ima/ima_template_lib.c
+++ b/security/integrity/ima/ima_template_lib.c
@@ -27,7 +27,6 @@ static bool ima_template_hash_algo_allowed(u8 algo)
enum data_formats {
DATA_FMT_DIGEST = 0,
DATA_FMT_DIGEST_WITH_ALGO,
- DATA_FMT_EVENT_NAME,
DATA_FMT_STRING,
DATA_FMT_HEX
};
@@ -37,18 +36,10 @@ static int ima_write_template_field_data(const void *data, const u32 datalen,
struct ima_field_data *field_data)
{
u8 *buf, *buf_ptr;
- u32 buflen;
+ u32 buflen = datalen;
- switch (datafmt) {
- case DATA_FMT_EVENT_NAME:
- buflen = IMA_EVENT_NAME_LEN_MAX + 1;
- break;
- case DATA_FMT_STRING:
+ if (datafmt == DATA_FMT_STRING)
buflen = datalen + 1;
- break;
- default:
- buflen = datalen;
- }
buf = kzalloc(buflen, GFP_KERNEL);
if (!buf)
@@ -63,7 +54,7 @@ static int ima_write_template_field_data(const void *data, const u32 datalen,
* split into multiple template fields (the space is the delimitator
* character for measurements lists in ASCII format).
*/
- if (datafmt == DATA_FMT_EVENT_NAME || datafmt == DATA_FMT_STRING) {
+ if (datafmt == DATA_FMT_STRING) {
for (buf_ptr = buf; buf_ptr - buf < datalen; buf_ptr++)
if (*buf_ptr == ' ')
*buf_ptr = '_';
@@ -281,8 +272,6 @@ static int ima_eventname_init_common(struct integrity_iint_cache *iint,
{
const char *cur_filename = NULL;
u32 cur_filename_len = 0;
- enum data_formats fmt = size_limit ?
- DATA_FMT_EVENT_NAME : DATA_FMT_STRING;
BUG_ON(filename == NULL && file == NULL);
@@ -305,7 +294,7 @@ static int ima_eventname_init_common(struct integrity_iint_cache *iint,
cur_filename_len = IMA_EVENT_NAME_LEN_MAX;
out:
return ima_write_template_field_data(cur_filename, cur_filename_len,
- fmt, field_data);
+ DATA_FMT_STRING, field_data);
}
/*