1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (C) 2008 Alexey Dobriyan
8 #include <linux/module.h>
9 #include <linux/kallsyms.h>
10 #include <linux/mutex.h>
11 #include <linux/seq_file.h>
12 #include <linux/proc_fs.h>
15 #ifdef CONFIG_MODULE_UNLOAD
16 static inline void print_unload_info(struct seq_file *m, struct module *mod)
18 struct module_use *use;
19 int printed_something = 0;
21 seq_printf(m, " %i ", module_refcount(mod));
24 * Always include a trailing , so userspace can differentiate
25 * between this and the old multi-field proc format.
27 list_for_each_entry(use, &mod->source_list, source_list) {
28 printed_something = 1;
29 seq_printf(m, "%s,", use->source->name);
32 if (mod->init && !mod->exit) {
33 printed_something = 1;
34 seq_puts(m, "[permanent],");
37 if (!printed_something)
40 #else /* !CONFIG_MODULE_UNLOAD */
41 static inline void print_unload_info(struct seq_file *m, struct module *mod)
43 /* We don't know the usage count, or what modules are using. */
46 #endif /* CONFIG_MODULE_UNLOAD */
48 /* Called by the /proc file system to return a list of modules. */
49 static void *m_start(struct seq_file *m, loff_t *pos)
51 mutex_lock(&module_mutex);
52 return seq_list_start(&modules, *pos);
55 static void *m_next(struct seq_file *m, void *p, loff_t *pos)
57 return seq_list_next(p, &modules, pos);
60 static void m_stop(struct seq_file *m, void *p)
62 mutex_unlock(&module_mutex);
65 static int m_show(struct seq_file *m, void *p)
67 struct module *mod = list_entry(p, struct module, list);
68 char buf[MODULE_FLAGS_BUF_SIZE];
72 /* We always ignore unformed modules. */
73 if (mod->state == MODULE_STATE_UNFORMED)
76 size = mod->init_layout.size + mod->core_layout.size;
77 #ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
78 size += mod->data_layout.size;
80 seq_printf(m, "%s %u", mod->name, size);
81 print_unload_info(m, mod);
83 /* Informative for users. */
85 mod->state == MODULE_STATE_GOING ? "Unloading" :
86 mod->state == MODULE_STATE_COMING ? "Loading" :
88 /* Used by oprofile and other similar tools. */
89 value = m->private ? NULL : mod->core_layout.base;
90 seq_printf(m, " 0x%px", value);
94 seq_printf(m, " %s", module_flags(mod, buf));
101 * Format: modulename size refcount deps address
103 * Where refcount is a number or -, and deps is a comma-separated list
106 static const struct seq_operations modules_op = {
114 * This also sets the "private" pointer to non-NULL if the
115 * kernel pointers should be hidden (so you can just test
116 * "m->private" to see if you should keep the values private).
118 * We use the same logic as for /proc/kallsyms.
120 static int modules_open(struct inode *inode, struct file *file)
122 int err = seq_open(file, &modules_op);
125 struct seq_file *m = file->private_data;
127 m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul;
133 static const struct proc_ops modules_proc_ops = {
134 .proc_flags = PROC_ENTRY_PERMANENT,
135 .proc_open = modules_open,
136 .proc_read = seq_read,
137 .proc_lseek = seq_lseek,
138 .proc_release = seq_release,
141 static int __init proc_modules_init(void)
143 proc_create("modules", 0, NULL, &modules_proc_ops);
146 module_init(proc_modules_init);