| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Module taint unload tracking support |
| * |
| * Copyright (C) 2022 Aaron Tomlin |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/string.h> |
| #include <linux/printk.h> |
| #include <linux/slab.h> |
| #include <linux/list.h> |
| #include <linux/rculist.h> |
| #include "internal.h" |
| |
| static LIST_HEAD(unloaded_tainted_modules); |
| |
| int try_add_tainted_module(struct module *mod) |
| { |
| struct mod_unload_taint *mod_taint; |
| |
| module_assert_mutex_or_preempt(); |
| |
| list_for_each_entry_rcu(mod_taint, &unloaded_tainted_modules, list, |
| lockdep_is_held(&module_mutex)) { |
| if (!strcmp(mod_taint->name, mod->name) && |
| mod_taint->taints & mod->taints) { |
| mod_taint->count++; |
| goto out; |
| } |
| } |
| |
| mod_taint = kmalloc(sizeof(*mod_taint), GFP_KERNEL); |
| if (unlikely(!mod_taint)) |
| return -ENOMEM; |
| strscpy(mod_taint->name, mod->name, MODULE_NAME_LEN); |
| mod_taint->taints = mod->taints; |
| list_add_rcu(&mod_taint->list, &unloaded_tainted_modules); |
| mod_taint->count = 1; |
| out: |
| return 0; |
| } |
| |
| void print_unloaded_tainted_modules(void) |
| { |
| struct mod_unload_taint *mod_taint; |
| char buf[MODULE_FLAGS_BUF_SIZE]; |
| |
| if (!list_empty(&unloaded_tainted_modules)) { |
| printk(KERN_DEFAULT "Unloaded tainted modules:"); |
| list_for_each_entry_rcu(mod_taint, &unloaded_tainted_modules, |
| list) { |
| size_t l; |
| |
| l = module_flags_taint(mod_taint->taints, buf); |
| buf[l++] = '\0'; |
| pr_cont(" %s(%s):%llu", mod_taint->name, buf, |
| mod_taint->count); |
| } |
| } |
| } |