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