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ima: Shallow copy the args_p member of ima_rule_entry.lsm elements

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The args_p member is a simple string that is allocated by
ima_rule_init(). Shallow copy it like other non-LSM references in
ima_rule_entry structs.

There are no longer any necessary error path cleanups to do in
ima_lsm_copy_rule().

Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Tyler Hicks 2020-07-09 01:19:07 -05:00 committed by Mimi Zohar
parent 5f3e92657b
commit 39e5993d0d
1 changed files with 8 additions and 10 deletions
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18
security/integrity/ima/ima_policy.c
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@ -300,10 +300,13 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
continue;
nentry->lsm[i].type = entry->lsm[i].type;
nentry->lsm[i].args_p = kstrdup(entry->lsm[i].args_p,
GFP_KERNEL);
if (!nentry->lsm[i].args_p)
goto out_err;
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;
security_filter_rule_init(nentry->lsm[i].type,
Audit_equal,
@ -311,14 +314,9 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
&nentry->lsm[i].rule);
if (!nentry->lsm[i].rule)
pr_warn("rule for LSM \'%s\' is undefined\n",
(char *)entry->lsm[i].args_p);
(char *)nentry->lsm[i].args_p);
}
return nentry;
out_err:
ima_lsm_free_rule(nentry);
kfree(nentry);
return NULL;
}
static int ima_lsm_update_rule(struct ima_rule_entry *entry)