@@ -23,7 +23,7 @@ Description:
[fowner]]
lsm: [[subj_user=] [subj_role=] [subj_type=]
[obj_user=] [obj_role=] [obj_type=]]
- option: [[appraise_type=]]
+ option: [[appraise_type=]] [permit_directio]
base: func:= [BPRM_CHECK][MMAP_CHECK][FILE_CHECK][MODULE_CHECK]
mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
@@ -140,6 +140,7 @@ int ima_must_measure(struct inode *inode, int mask, int function)
int ima_collect_measurement(struct integrity_iint_cache *iint,
struct file *file)
{
+ const char *audit_cause = "failed";
struct inode *inode = file_inode(file);
const char *filename = file->f_dentry->d_name.name;
int result = 0;
@@ -147,6 +148,11 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
if (!(iint->flags & IMA_COLLECTED)) {
u64 i_version = file_inode(file)->i_version;
+ if (file->f_flags & O_DIRECT) {
+ audit_cause = "failed(directio)";
+ result = -EACCES;
+ goto out;
+ }
iint->ima_xattr.type = IMA_XATTR_DIGEST;
result = ima_calc_file_hash(file, iint->ima_xattr.digest);
if (!result) {
@@ -154,9 +160,10 @@ int ima_collect_measurement(struct integrity_iint_cache *iint,
iint->flags |= IMA_COLLECTED;
}
}
+out:
if (result)
integrity_audit_msg(AUDIT_INTEGRITY_DATA, inode,
- filename, "collect_data", "failed",
+ filename, "collect_data", audit_cause,
result, 0);
return result;
}
@@ -186,8 +186,11 @@ static int process_measurement(struct file *file, const char *filename,
}
rc = ima_collect_measurement(iint, file);
- if (rc != 0)
+ if (rc != 0) {
+ if (file->f_flags & O_DIRECT)
+ rc = (iint->flags & IMA_PERMIT_DIRECTIO) ? 0 : -EACCES;
goto out_digsig;
+ }
pathname = !filename ? ima_d_path(&file->f_path, &pathbuf) : filename;
if (!pathname)
@@ -351,7 +351,7 @@ enum {
Opt_obj_user, Opt_obj_role, Opt_obj_type,
Opt_subj_user, Opt_subj_role, Opt_subj_type,
Opt_func, Opt_mask, Opt_fsmagic, Opt_uid, Opt_fowner,
- Opt_appraise_type, Opt_fsuuid
+ Opt_appraise_type, Opt_fsuuid, Opt_permit_directio
};
static match_table_t policy_tokens = {
@@ -373,6 +373,7 @@ static match_table_t policy_tokens = {
{Opt_uid, "uid=%s"},
{Opt_fowner, "fowner=%s"},
{Opt_appraise_type, "appraise_type=%s"},
+ {Opt_permit_directio, "permit_directio"},
{Opt_err, NULL}
};
@@ -621,6 +622,9 @@ static int ima_parse_rule(char *rule, struct ima_rule_entry *entry)
else
result = -EINVAL;
break;
+ case Opt_permit_directio:
+ entry->flags |= IMA_PERMIT_DIRECTIO;
+ break;
case Opt_err:
ima_log_string(ab, "UNKNOWN", p);
result = -EINVAL;
@@ -30,6 +30,7 @@
#define IMA_ACTION_FLAGS 0xff000000
#define IMA_DIGSIG 0x01000000
#define IMA_DIGSIG_REQUIRED 0x02000000
+#define IMA_PERMIT_DIRECTIO 0x04000000
#define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \
IMA_APPRAISE_SUBMASK)