[PATCH 5/5] audit: fix audit_compare_dname_path to take a qstr

Jeff Layton
2019-04-26T18:29:07Z

...and eliminate its strlen call.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
kernel/audit.h | 3 ++-
kernel/audit_fsnotify.c | 2 +-
kernel/audit_watch.c | 6 +++---
kernel/auditfilter.c | 7 ++++---
kernel/auditsc.c | 7 +++----
5 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/kernel/audit.h b/kernel/audit.h
index 958d5b8fc1b3..8c581fd38050 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -231,7 +231,8 @@ extern int audit_comparator(const u32 left, const u32 op, const u32 right);
extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
extern int parent_len(const char *path);
-extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
+extern int audit_compare_dname_path(const struct qstr *dname, const char *path,
+ int plen);
extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
const void *payload, int size);
extern void audit_panic(const char *message);
diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
index 6def7f426ba6..af281e965d24 100644
--- a/kernel/audit_fsnotify.c
+++ b/kernel/audit_fsnotify.c
@@ -188,7 +188,7 @@ static int audit_mark_handle_event(struct fsnotify_group *group,
}

if (mask & (FS_CREATE|FS_MOVED_TO|FS_DELETE|FS_MOVED_FROM)) {
- if (audit_compare_dname_path(dname->name, audit_mark->path,
+ if (audit_compare_dname_path(dname, audit_mark->path,
AUDIT_NAME_FULL))
return 0;
audit_update_mark(audit_mark, inode);
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index 3c12fd5b680e..b50c574223fa 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -255,7 +255,7 @@ static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watc

/* Update inode info in audit rules based on filesystem event. */
static void audit_update_watch(struct audit_parent *parent,
- const char *dname, dev_t dev,
+ const struct qstr *dname, dev_t dev,
unsigned long ino, unsigned invalidating)
{
struct audit_watch *owatch, *nwatch, *nextw;
@@ -507,9 +507,9 @@ static int audit_watch_handle_event(struct fsnotify_group *group,
}

if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
- audit_update_watch(parent, dname->name, inode->i_sb->s_dev, inode->i_ino, 0);
+ audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
else if (mask & (FS_DELETE|FS_MOVED_FROM))
- audit_update_watch(parent, dname->name, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);
+ audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);
else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
audit_remove_parent_watches(parent);

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 63f8b3f26fab..6f585b48f4ef 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1290,12 +1290,13 @@ int parent_len(const char *path)
* @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL
* here indicates that we must compute this value.
*/
-int audit_compare_dname_path(const char *dname, const char *path, int parentlen)
+int audit_compare_dname_path(const struct qstr *dname, const char *path,
+ int parentlen)
{
int dlen, pathlen;
const char *p;

- dlen = strlen(dname);
+ dlen = dname->len;
pathlen = strlen(path);
if (pathlen < dlen)
return 1;
@@ -1306,7 +1307,7 @@ int audit_compare_dname_path(const char *dname, const char *path, int parentlen)

p = path + parentlen;

- return strncmp(p, dname, dlen);
+ return strncmp(p, dname->name, dlen);
}

int audit_filter(int msgtype, unsigned int listtype)
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d1eab1d4a930..05e06b766af1 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2045,7 +2045,6 @@ void __audit_inode_child(struct inode *parent,
{
struct audit_context *context = audit_context();
struct inode *inode = d_backing_inode(dentry);
- const char *dname = dentry->d_name.name;
struct audit_names *n, *found_parent = NULL, *found_child = NULL;
struct audit_entry *e;
struct list_head *list = &audit_filter_list[AUDIT_FILTER_FS];
@@ -2083,7 +2082,7 @@ void __audit_inode_child(struct inode *parent,
continue;

if (n->ino == parent->i_ino && n->dev == parent->i_sb->s_dev &&
- !audit_compare_dname_path(dname,
+ !audit_compare_dname_path(&dentry->d_name,
n->name->name, n->name_len)) {
if (n->type == AUDIT_TYPE_UNKNOWN)
n->type = AUDIT_TYPE_PARENT;
@@ -2099,8 +2098,8 @@ void __audit_inode_child(struct inode *parent,
(n->type != type && n->type != AUDIT_TYPE_UNKNOWN))
continue;

- if (!strcmp(dname, n->name->name) ||
- !audit_compare_dname_path(dname, n->name->name,
+ if (!strcmp(dentry->d_name.name, n->name->name) ||
+ !audit_compare_dname_path(&dentry->d_name, n->name->name,
found_parent ?
found_parent->name_len :
AUDIT_NAME_FULL)) {
--
2.20.1