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ima: Do not audit if CONFIG_INTEGRITY_AUDIT is not set

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If Integrity is not auditing, IMA shouldn't audit, either.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
This commit is contained in:
Stefan Berger
2018-06-04 16:54:54 -04:00
committed by Mimi Zohar
parent 3d2859d5d4
commit 2afd020aae
3 changed files with 21 additions and 1 deletions
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1
security/integrity/ima/Kconfig
View File

@@ -12,6 +12,7 @@ config IMA
select TCG_TIS if TCG_TPM && X86 select TCG_TIS if TCG_TPM && X86
select TCG_CRB if TCG_TPM && ACPI select TCG_CRB if TCG_TPM && ACPI
select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES
select INTEGRITY_AUDIT if AUDIT
help help
The Trusted Computing Group(TCG) runtime Integrity The Trusted Computing Group(TCG) runtime Integrity
Measurement Architecture(IMA) maintains a list of hash Measurement Architecture(IMA) maintains a list of hash

6
security/integrity/ima/ima_policy.c
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@@ -657,6 +657,9 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry,
static void ima_log_string_op(struct audit_buffer *ab, char *key, char *value, static void ima_log_string_op(struct audit_buffer *ab, char *key, char *value,
bool (*rule_operator)(kuid_t, kuid_t)) bool (*rule_operator)(kuid_t, kuid_t))
{ {
if (!ab)
return;
if (rule_operator == &uid_gt) if (rule_operator == &uid_gt)
audit_log_format(ab, "%s>", key); audit_log_format(ab, "%s>", key);
else if (rule_operator == &uid_lt) else if (rule_operator == &uid_lt)
@@ -678,7 +681,8 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
bool uid_token; bool uid_token;
int result = 0; int result = 0;
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_RULE); ab = integrity_audit_log_start(NULL, GFP_KERNEL,
AUDIT_INTEGRITY_RULE);
entry->uid = INVALID_UID; entry->uid = INVALID_UID;
entry->fowner = INVALID_UID; entry->fowner = INVALID_UID;

15
security/integrity/integrity.h
View File

@@ -15,6 +15,7 @@
#include <linux/integrity.h> #include <linux/integrity.h>
#include <crypto/sha.h> #include <crypto/sha.h>
#include <linux/key.h> #include <linux/key.h>
#include <linux/audit.h>
/* iint action cache flags */ /* iint action cache flags */
#define IMA_MEASURE 0x00000001 #define IMA_MEASURE 0x00000001
@@ -199,6 +200,13 @@ static inline void evm_load_x509(void)
void integrity_audit_msg(int audit_msgno, struct inode *inode, void integrity_audit_msg(int audit_msgno, struct inode *inode,
const unsigned char *fname, const char *op, const unsigned char *fname, const char *op,
const char *cause, int result, int info); const char *cause, int result, int info);
static inline struct audit_buffer *
integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
{
return audit_log_start(ctx, gfp_mask, type);
}
#else #else
static inline void integrity_audit_msg(int audit_msgno, struct inode *inode, static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
const unsigned char *fname, const unsigned char *fname,
@@ -206,4 +214,11 @@ static inline void integrity_audit_msg(int audit_msgno, struct inode *inode,
int result, int info) int result, int info)
{ {
} }
static inline struct audit_buffer *
integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
{
return NULL;
}
#endif #endif