[PATCH 26/59] IMA: Clean out lsm_export scaffolding
Casey Schaufler
casey at schaufler-ca.com
Tue Apr 9 19:58:51 UTC 2019
Clean out the scaffolding used in the lsm_export transition.
This requires changing some of the IMA internal interfaces
from u32 to struct lsm_export pointers.
Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
---
security/integrity/ima/ima.h | 10 ++++++----
security/integrity/ima/ima_api.c | 9 +++++----
security/integrity/ima/ima_appraise.c | 4 +---
security/integrity/ima/ima_main.c | 25 ++++++++-----------------
security/integrity/ima/ima_policy.c | 14 +++++++-------
5 files changed, 27 insertions(+), 35 deletions(-)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index d213e835c498..8b109ad0de2e 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -192,8 +192,9 @@ enum ima_hooks {
};
/* LIM API function definitions */
-int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
- int mask, enum ima_hooks func, int *pcr);
+int ima_get_action(struct inode *inode, const struct cred *cred,
+ struct lsm_export *l, int mask, enum ima_hooks func,
+ int *pcr);
int ima_must_measure(struct inode *inode, int mask, enum ima_hooks func);
int ima_collect_measurement(struct integrity_iint_cache *iint,
struct file *file, void *buf, loff_t size,
@@ -213,8 +214,9 @@ void ima_free_template_entry(struct ima_template_entry *entry);
const char *ima_d_path(const struct path *path, char **pathbuf, char *filename);
/* IMA policy related functions */
-int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
- enum ima_hooks func, int mask, int flags, int *pcr);
+int ima_match_policy(struct inode *inode, const struct cred *cred,
+ struct lsm_export *l, enum ima_hooks func, int mask,
+ int flags, int *pcr);
void ima_init_policy(void);
void ima_update_policy(void);
void ima_update_policy_flag(void);
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index c7505fb122d4..7e493af96134 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -159,7 +159,7 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
* ima_get_action - appraise & measure decision based on policy.
* @inode: pointer to inode to measure
* @cred: pointer to credentials structure to validate
- * @secid: secid of the task being validated
+ * @l: LAM data of the task being validated
* @mask: contains the permission mask (MAY_READ, MAY_WRITE, MAY_EXEC,
* MAY_APPEND)
* @func: caller identifier
@@ -175,14 +175,15 @@ void ima_add_violation(struct file *file, const unsigned char *filename,
* Returns IMA_MEASURE, IMA_APPRAISE mask.
*
*/
-int ima_get_action(struct inode *inode, const struct cred *cred, u32 secid,
- int mask, enum ima_hooks func, int *pcr)
+int ima_get_action(struct inode *inode, const struct cred *cred,
+ struct lsm_export *l, int mask, enum ima_hooks func,
+ int *pcr)
{
int flags = IMA_MEASURE | IMA_AUDIT | IMA_APPRAISE | IMA_HASH;
flags &= ima_policy_flag;
- return ima_match_policy(inode, cred, secid, func, mask, flags, pcr);
+ return ima_match_policy(inode, cred, l, func, mask, flags, pcr);
}
/*
diff --git a/security/integrity/ima/ima_appraise.c b/security/integrity/ima/ima_appraise.c
index be714afc9fd2..ba64b0b61383 100644
--- a/security/integrity/ima/ima_appraise.c
+++ b/security/integrity/ima/ima_appraise.c
@@ -50,15 +50,13 @@ bool is_ima_appraise_enabled(void)
*/
int ima_must_appraise(struct inode *inode, int mask, enum ima_hooks func)
{
- u32 secid;
struct lsm_export le;
if (!ima_appraise)
return 0;
security_task_getsecid(current, &le);
- lsm_export_secid(&le, &secid);
- return ima_match_policy(inode, current_cred(), secid, func, mask,
+ return ima_match_policy(inode, current_cred(), &le, func, mask,
IMA_APPRAISE | IMA_HASH, NULL);
}
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index f5efa9ef270d..22b973e743fe 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -169,8 +169,8 @@ void ima_file_free(struct file *file)
}
static int process_measurement(struct file *file, const struct cred *cred,
- u32 secid, char *buf, loff_t size, int mask,
- enum ima_hooks func)
+ struct lsm_export *l, char *buf, loff_t size,
+ int mask, enum ima_hooks func)
{
struct inode *inode = file_inode(file);
struct integrity_iint_cache *iint = NULL;
@@ -192,7 +192,7 @@ static int process_measurement(struct file *file, const struct cred *cred,
* bitmask based on the appraise/audit/measurement policy.
* Included is the appraise submask.
*/
- action = ima_get_action(inode, cred, secid, mask, func, &pcr);
+ action = ima_get_action(inode, cred, l, mask, func, &pcr);
violation_check = ((func == FILE_CHECK || func == MMAP_CHECK) &&
(ima_policy_flag & IMA_MEASURE));
if (!action && !violation_check)
@@ -335,13 +335,11 @@ static int process_measurement(struct file *file, const struct cred *cred,
*/
int ima_file_mmap(struct file *file, unsigned long prot)
{
- u32 secid;
struct lsm_export le;
if (file && (prot & PROT_EXEC)) {
security_task_getsecid(current, &le);
- lsm_export_secid(&le, &secid);
- return process_measurement(file, current_cred(), secid, NULL,
+ return process_measurement(file, current_cred(), &le, NULL,
0, MAY_EXEC, MMAP_CHECK);
}
@@ -364,19 +362,16 @@ int ima_file_mmap(struct file *file, unsigned long prot)
int ima_bprm_check(struct linux_binprm *bprm)
{
int ret;
- u32 secid;
struct lsm_export le;
security_task_getsecid(current, &le);
- lsm_export_secid(&le, &secid);
- ret = process_measurement(bprm->file, current_cred(), secid, NULL, 0,
+ ret = process_measurement(bprm->file, current_cred(), &le, NULL, 0,
MAY_EXEC, BPRM_CHECK);
if (ret)
return ret;
security_cred_getsecid(bprm->cred, &le);
- lsm_export_secid(&le, &secid);
- return process_measurement(bprm->file, bprm->cred, secid, NULL, 0,
+ return process_measurement(bprm->file, bprm->cred, &le, NULL, 0,
MAY_EXEC, CREDS_CHECK);
}
@@ -392,12 +387,10 @@ int ima_bprm_check(struct linux_binprm *bprm)
*/
int ima_file_check(struct file *file, int mask)
{
- u32 secid;
struct lsm_export le;
security_task_getsecid(current, &le);
- lsm_export_secid(&le, &secid);
- return process_measurement(file, current_cred(), secid, NULL, 0,
+ return process_measurement(file, current_cred(), &le, NULL, 0,
mask & (MAY_READ | MAY_WRITE | MAY_EXEC |
MAY_APPEND), FILE_CHECK);
}
@@ -506,7 +499,6 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
enum kernel_read_file_id read_id)
{
enum ima_hooks func;
- u32 secid;
struct lsm_export le;
if (!file && read_id == READING_FIRMWARE) {
@@ -530,8 +522,7 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
func = read_idmap[read_id] ?: FILE_CHECK;
security_task_getsecid(current, &le);
- lsm_export_secid(&le, &secid);
- return process_measurement(file, current_cred(), secid, buf, size,
+ return process_measurement(file, current_cred(), &le, buf, size,
MAY_READ, func);
}
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 280f2410e551..fae4718d24f9 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -286,7 +286,7 @@ static void ima_lsm_update_rules(void)
* Returns true on rule match, false on failure.
*/
static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
- const struct cred *cred, u32 secid,
+ const struct cred *cred, struct lsm_export *l,
enum ima_hooks func, int mask)
{
int i;
@@ -345,8 +345,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
case LSM_SUBJ_USER:
case LSM_SUBJ_ROLE:
case LSM_SUBJ_TYPE:
- lsm_export_to_all(&le, secid);
- rc = security_filter_rule_match(&le,
+ rc = security_filter_rule_match(l,
rule->lsm[i].type,
Audit_equal,
rule->lsm[i].rule);
@@ -394,7 +393,7 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
* @inode: pointer to an inode for which the policy decision is being made
* @cred: pointer to a credentials structure for which the policy decision is
* being made
- * @secid: LSM secid of the task to be validated
+ * @l: LSM data of the task to be validated
* @func: IMA hook identifier
* @mask: requested action (MAY_READ | MAY_WRITE | MAY_APPEND | MAY_EXEC)
* @pcr: set the pcr to extend
@@ -406,8 +405,9 @@ static int get_subaction(struct ima_rule_entry *rule, enum ima_hooks func)
* list when walking it. Reads are many orders of magnitude more numerous
* than writes so ima_match_policy() is classical RCU candidate.
*/
-int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
- enum ima_hooks func, int mask, int flags, int *pcr)
+int ima_match_policy(struct inode *inode, const struct cred *cred,
+ struct lsm_export *l, enum ima_hooks func, int mask,
+ int flags, int *pcr)
{
struct ima_rule_entry *entry;
int action = 0, actmask = flags | (flags << 1);
@@ -418,7 +418,7 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
if (!(entry->action & actmask))
continue;
- if (!ima_match_rules(entry, inode, cred, secid, func, mask))
+ if (!ima_match_rules(entry, inode, cred, l, func, mask))
continue;
action |= entry->flags & IMA_ACTION_FLAGS;
--
2.19.1
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