1*99bd9956SAaron Tomlin // SPDX-License-Identifier: GPL-2.0-or-later 2*99bd9956SAaron Tomlin /* 3*99bd9956SAaron Tomlin * Module taint unload tracking support 4*99bd9956SAaron Tomlin * 5*99bd9956SAaron Tomlin * Copyright (C) 2022 Aaron Tomlin 6*99bd9956SAaron Tomlin */ 7*99bd9956SAaron Tomlin 8*99bd9956SAaron Tomlin #include <linux/module.h> 9*99bd9956SAaron Tomlin #include <linux/string.h> 10*99bd9956SAaron Tomlin #include <linux/printk.h> 11*99bd9956SAaron Tomlin #include <linux/slab.h> 12*99bd9956SAaron Tomlin #include <linux/list.h> 13*99bd9956SAaron Tomlin #include <linux/rculist.h> 14*99bd9956SAaron Tomlin #include "internal.h" 15*99bd9956SAaron Tomlin 16*99bd9956SAaron Tomlin static LIST_HEAD(unloaded_tainted_modules); 17*99bd9956SAaron Tomlin 18*99bd9956SAaron Tomlin int try_add_tainted_module(struct module *mod) 19*99bd9956SAaron Tomlin { 20*99bd9956SAaron Tomlin struct mod_unload_taint *mod_taint; 21*99bd9956SAaron Tomlin 22*99bd9956SAaron Tomlin module_assert_mutex_or_preempt(); 23*99bd9956SAaron Tomlin 24*99bd9956SAaron Tomlin list_for_each_entry_rcu(mod_taint, &unloaded_tainted_modules, list, 25*99bd9956SAaron Tomlin lockdep_is_held(&module_mutex)) { 26*99bd9956SAaron Tomlin if (!strcmp(mod_taint->name, mod->name) && 27*99bd9956SAaron Tomlin mod_taint->taints & mod->taints) { 28*99bd9956SAaron Tomlin mod_taint->count++; 29*99bd9956SAaron Tomlin goto out; 30*99bd9956SAaron Tomlin } 31*99bd9956SAaron Tomlin } 32*99bd9956SAaron Tomlin 33*99bd9956SAaron Tomlin mod_taint = kmalloc(sizeof(*mod_taint), GFP_KERNEL); 34*99bd9956SAaron Tomlin if (unlikely(!mod_taint)) 35*99bd9956SAaron Tomlin return -ENOMEM; 36*99bd9956SAaron Tomlin strscpy(mod_taint->name, mod->name, MODULE_NAME_LEN); 37*99bd9956SAaron Tomlin mod_taint->taints = mod->taints; 38*99bd9956SAaron Tomlin list_add_rcu(&mod_taint->list, &unloaded_tainted_modules); 39*99bd9956SAaron Tomlin mod_taint->count = 1; 40*99bd9956SAaron Tomlin out: 41*99bd9956SAaron Tomlin return 0; 42*99bd9956SAaron Tomlin } 43*99bd9956SAaron Tomlin 44*99bd9956SAaron Tomlin void print_unloaded_tainted_modules(void) 45*99bd9956SAaron Tomlin { 46*99bd9956SAaron Tomlin struct mod_unload_taint *mod_taint; 47*99bd9956SAaron Tomlin char buf[MODULE_FLAGS_BUF_SIZE]; 48*99bd9956SAaron Tomlin 49*99bd9956SAaron Tomlin if (!list_empty(&unloaded_tainted_modules)) { 50*99bd9956SAaron Tomlin printk(KERN_DEFAULT "Unloaded tainted modules:"); 51*99bd9956SAaron Tomlin list_for_each_entry_rcu(mod_taint, &unloaded_tainted_modules, 52*99bd9956SAaron Tomlin list) { 53*99bd9956SAaron Tomlin size_t l; 54*99bd9956SAaron Tomlin 55*99bd9956SAaron Tomlin l = module_flags_taint(mod_taint->taints, buf); 56*99bd9956SAaron Tomlin buf[l++] = '\0'; 57*99bd9956SAaron Tomlin pr_cont(" %s(%s):%llu", mod_taint->name, buf, 58*99bd9956SAaron Tomlin mod_taint->count); 59*99bd9956SAaron Tomlin } 60*99bd9956SAaron Tomlin } 61*99bd9956SAaron Tomlin } 62