In audit_rule_change(), audit_data_to_entry() is firstly invoked to
translate the payload data to the kernel's rule representation. In
audit_data_to_entry(), depending on the audit field type, an audit tree may
be created in audit_make_tree(), which eventually invokes kmalloc() to
allocate the tree. Since this tree is a temporary tree, it will be then
freed in the following execution, e.g., audit_add_rule() if the message
type is AUDIT_ADD_RULE or audit_del_rule() if the message type is
AUDIT_DEL_RULE. However, if the message type is neither AUDIT_ADD_RULE nor
AUDIT_DEL_RULE, i.e., the default case of the switch statement, this
temporary tree is not freed.
To fix this issue, only allocate the tree when the type is AUDIT_ADD_RULE
or AUDIT_DEL_RULE.
Signed-off-by: Wenwen Wang <[email protected]>
---
kernel/auditfilter.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 63f8b3f..3ac71c4 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1114,22 +1114,24 @@ int audit_rule_change(int type, int seq, void *data, size_t datasz)
int err = 0;
struct audit_entry *entry;
- entry = audit_data_to_entry(data, datasz);
- if (IS_ERR(entry))
- return PTR_ERR(entry);
-
switch (type) {
case AUDIT_ADD_RULE:
+ entry = audit_data_to_entry(data, datasz);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
err = audit_add_rule(entry);
audit_log_rule_change("add_rule", &entry->rule, !err);
break;
case AUDIT_DEL_RULE:
+ entry = audit_data_to_entry(data, datasz);
+ if (IS_ERR(entry))
+ return PTR_ERR(entry);
err = audit_del_rule(entry);
audit_log_rule_change("remove_rule", &entry->rule, !err);
break;
default:
- err = -EINVAL;
WARN_ON(1);
+ return -EINVAL;
}
if (err || type == AUDIT_DEL_RULE) {
--
2.7.4
On 2019-04-19 20:49, Wenwen Wang wrote:
> In audit_rule_change(), audit_data_to_entry() is firstly invoked to
> translate the payload data to the kernel's rule representation. In
> audit_data_to_entry(), depending on the audit field type, an audit tree may
> be created in audit_make_tree(), which eventually invokes kmalloc() to
> allocate the tree. Since this tree is a temporary tree, it will be then
> freed in the following execution, e.g., audit_add_rule() if the message
> type is AUDIT_ADD_RULE or audit_del_rule() if the message type is
> AUDIT_DEL_RULE. However, if the message type is neither AUDIT_ADD_RULE nor
> AUDIT_DEL_RULE, i.e., the default case of the switch statement, this
> temporary tree is not freed.
>
> To fix this issue, only allocate the tree when the type is AUDIT_ADD_RULE
> or AUDIT_DEL_RULE.
>
> Signed-off-by: Wenwen Wang <[email protected]>
Looks good to me.
Reviewed-by: Richard Guy Briggs <[email protected]>
> ---
> kernel/auditfilter.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
> index 63f8b3f..3ac71c4 100644
> --- a/kernel/auditfilter.c
> +++ b/kernel/auditfilter.c
> @@ -1114,22 +1114,24 @@ int audit_rule_change(int type, int seq, void *data, size_t datasz)
> int err = 0;
> struct audit_entry *entry;
>
> - entry = audit_data_to_entry(data, datasz);
> - if (IS_ERR(entry))
> - return PTR_ERR(entry);
> -
> switch (type) {
> case AUDIT_ADD_RULE:
> + entry = audit_data_to_entry(data, datasz);
> + if (IS_ERR(entry))
> + return PTR_ERR(entry);
> err = audit_add_rule(entry);
> audit_log_rule_change("add_rule", &entry->rule, !err);
> break;
> case AUDIT_DEL_RULE:
> + entry = audit_data_to_entry(data, datasz);
> + if (IS_ERR(entry))
> + return PTR_ERR(entry);
> err = audit_del_rule(entry);
> audit_log_rule_change("remove_rule", &entry->rule, !err);
> break;
> default:
> - err = -EINVAL;
> WARN_ON(1);
> + return -EINVAL;
> }
>
> if (err || type == AUDIT_DEL_RULE) {
> --
> 2.7.4
>
> --
> Linux-audit mailing list
> [email protected]
> https://www.redhat.com/mailman/listinfo/linux-audit
- RGB
--
Richard Guy Briggs <[email protected]>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635
On Fri, Apr 19, 2019 at 9:49 PM Wenwen Wang <[email protected]> wrote:
> In audit_rule_change(), audit_data_to_entry() is firstly invoked to
> translate the payload data to the kernel's rule representation. In
> audit_data_to_entry(), depending on the audit field type, an audit tree may
> be created in audit_make_tree(), which eventually invokes kmalloc() to
> allocate the tree. Since this tree is a temporary tree, it will be then
> freed in the following execution, e.g., audit_add_rule() if the message
> type is AUDIT_ADD_RULE or audit_del_rule() if the message type is
> AUDIT_DEL_RULE. However, if the message type is neither AUDIT_ADD_RULE nor
> AUDIT_DEL_RULE, i.e., the default case of the switch statement, this
> temporary tree is not freed.
>
> To fix this issue, only allocate the tree when the type is AUDIT_ADD_RULE
> or AUDIT_DEL_RULE.
>
> Signed-off-by: Wenwen Wang <[email protected]>
> ---
> kernel/auditfilter.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
Merged into audit/next - thanks!
--
paul moore
http://www.paul-moore.com