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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128// 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/debugfs.h>#include <linux/rculist.h>#include "internal.h"
static LIST_HEAD(unloaded_tainted_modules);extern struct dentry *mod_debugfs_root;
int try_add_tainted_module(struct module *mod){ struct mod_unload_taint *mod_taint;
if (!mod->taints) goto out;
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_obj(*mod_taint); 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); } }}
#ifdef CONFIG_DEBUG_FSstatic void *unloaded_tainted_modules_seq_start(struct seq_file *m, loff_t *pos) __acquires(rcu){ rcu_read_lock(); return seq_list_start_rcu(&unloaded_tainted_modules, *pos);}
static void *unloaded_tainted_modules_seq_next(struct seq_file *m, void *p, loff_t *pos){ return seq_list_next_rcu(p, &unloaded_tainted_modules, pos);}
static void unloaded_tainted_modules_seq_stop(struct seq_file *m, void *p) __releases(rcu){ rcu_read_unlock();}
static int unloaded_tainted_modules_seq_show(struct seq_file *m, void *p){ struct mod_unload_taint *mod_taint; char buf[MODULE_FLAGS_BUF_SIZE]; size_t l;
mod_taint = list_entry(p, struct mod_unload_taint, list); l = module_flags_taint(mod_taint->taints, buf); buf[l++] = '\0';
seq_printf(m, "%s (%s) %llu", mod_taint->name, buf, mod_taint->count); seq_puts(m, "\n");
return 0;}
static const struct seq_operations unloaded_tainted_modules_seq_ops = { .start = unloaded_tainted_modules_seq_start, .next = unloaded_tainted_modules_seq_next, .stop = unloaded_tainted_modules_seq_stop, .show = unloaded_tainted_modules_seq_show,};
static int unloaded_tainted_modules_open(struct inode *inode, struct file *file){ return seq_open(file, &unloaded_tainted_modules_seq_ops);}
static const struct file_operations unloaded_tainted_modules_fops = { .open = unloaded_tainted_modules_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release,};
static int __init unloaded_tainted_modules_init(void){ debugfs_create_file("unloaded_tainted", 0444, mod_debugfs_root, NULL, &unloaded_tainted_modules_fops); return 0;}module_init(unloaded_tainted_modules_init);#endif /* CONFIG_DEBUG_FS */