1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
// 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);
}
}
}
|
