audit: fix suffixed '/' filename matching

JIRA: https://issues.redhat.com/browse/RHEL-78967
JIRA: https://issues.redhat.com/browse/RHEL-90107

This patch is a backport of the following upstream commit:
commit e92eebb
Author: Ricardo Robaina <rrobaina@redhat.com>
Date:   Fri Nov 22 09:18:43 2024 -0300

    audit: fix suffixed '/' filename matching

    When the user specifies a directory to delete with the suffix '/',
    the audit record fails to collect the filename, resulting in the
    following logs:

     type=PATH msg=audit(10/30/2024 14:11:17.796:6304) : item=2 name=(null)
     type=PATH msg=audit(10/30/2024 14:11:17.796:6304) : item=1 name=(null)

    It happens because the value of the variables dname, and n->name->name
    in __audit_inode_child() differ only by the suffix '/'. This commit
    treats this corner case by handling pathname's trailing slashes in
    audit_compare_dname_path().

    Steps to reproduce the issue:

     # auditctl -w /tmp
     $ mkdir /tmp/foo
     $ rm -r /tmp/foo/
     # ausearch -i | grep PATH | tail -3

    The first version of this patch was based on a GitHub patch/PR by
    user @hqh2010 [1].

    Link: linux-audit/audit-kernel#148 [1]

    Suggested-by: Paul Moore <paul@paul-moore.com>
    Signed-off-by: Ricardo Robaina <rrobaina@redhat.com>
    Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
    [PM: subject tweak, trim old metadata]
    Signed-off-by: Paul Moore <paul@paul-moore.com>

Signed-off-by: Ricardo Robaina <rrobaina@redhat.com>

Author: rprobaina

kernel/auditfilter.c

@@ -1318,13 +1318,20 @@ int audit_compare_dname_path(const struct qstr *dname, const char *path, int par
 	if (pathlen < dlen)
 		return 1;
 
-	parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen;
-	if (pathlen - parentlen != dlen)
-		return 1;
+	if (parentlen == AUDIT_NAME_FULL)
+		parentlen = parent_len(path);
 
 	p = path + parentlen;
 
-	return strncmp(p, dname->name, dlen);
+	/* handle trailing slashes */
+	pathlen -= parentlen;
+	while (p[pathlen - 1] == '/')
+		pathlen--;
+
+	if (pathlen != dlen)
+		return 1;
+
+	return memcmp(p, dname->name, dlen);
 }
 
 int audit_filter(int msgtype, unsigned int listtype)