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| author | GUO Zihua <guozihua@huawei.com> | 2022-09-21 20:58:03 +0800 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.ibm.com> | 2022-11-02 18:50:48 -0400 |
| commit | d57378d3aa4d864d9e590482602068af1b20c0c5 (patch) | |
| tree | c444d2fba9f32bfc3432cfc0c8931cf61f44e6cc /security | |
| parent | 11220db412edae8dba58853238f53258268bdb88 (diff) | |
| download | lwn-d57378d3aa4d864d9e590482602068af1b20c0c5.tar.gz lwn-d57378d3aa4d864d9e590482602068af1b20c0c5.zip | |
ima: Simplify ima_lsm_copy_rule
Currently ima_lsm_copy_rule() set the arg_p field of the source rule to
NULL, so that the source rule could be freed afterward. It does not make
sense for this behavior to be inside a "copy" function. So move it
outside and let the caller handle this field.
ima_lsm_copy_rule() now produce a shallow copy of the original entry
including args_p field. Meaning only the lsm.rule and the rule itself
should be freed for the original rule. Thus, instead of calling
ima_lsm_free_rule() which frees lsm.rule as well as args_p field, free
the lsm.rule directly.
Signed-off-by: GUO Zihua <guozihua@huawei.com>
Reviewed-by: Roberto Sassu <roberto.sassu@huawei.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/integrity/ima/ima_policy.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index a8802b8da946..8040215c0252 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -398,12 +398,6 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry) nentry->lsm[i].type = entry->lsm[i].type; nentry->lsm[i].args_p = entry->lsm[i].args_p; - /* - * Remove the reference from entry so that the associated - * memory will not be freed during a later call to - * ima_lsm_free_rule(entry). - */ - entry->lsm[i].args_p = NULL; ima_filter_rule_init(nentry->lsm[i].type, Audit_equal, nentry->lsm[i].args_p, @@ -417,6 +411,7 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry) static int ima_lsm_update_rule(struct ima_rule_entry *entry) { + int i; struct ima_rule_entry *nentry; nentry = ima_lsm_copy_rule(entry); @@ -431,7 +426,8 @@ static int ima_lsm_update_rule(struct ima_rule_entry *entry) * references and the entry itself. All other memory references will now * be owned by nentry. */ - ima_lsm_free_rule(entry); + for (i = 0; i < MAX_LSM_RULES; i++) + ima_filter_rule_free(entry->lsm[i].rule); kfree(entry); return 0; |