10ffc40f6SAaron Tomlin // SPDX-License-Identifier: GPL-2.0-or-later
20ffc40f6SAaron Tomlin /*
30ffc40f6SAaron Tomlin * Module proc support
40ffc40f6SAaron Tomlin *
50ffc40f6SAaron Tomlin * Copyright (C) 2008 Alexey Dobriyan
60ffc40f6SAaron Tomlin */
70ffc40f6SAaron Tomlin
80ffc40f6SAaron Tomlin #include <linux/module.h>
90ffc40f6SAaron Tomlin #include <linux/kallsyms.h>
100ffc40f6SAaron Tomlin #include <linux/mutex.h>
110ffc40f6SAaron Tomlin #include <linux/seq_file.h>
120ffc40f6SAaron Tomlin #include <linux/proc_fs.h>
130ffc40f6SAaron Tomlin #include "internal.h"
140ffc40f6SAaron Tomlin
150ffc40f6SAaron Tomlin #ifdef CONFIG_MODULE_UNLOAD
print_unload_info(struct seq_file * m,struct module * mod)160ffc40f6SAaron Tomlin static inline void print_unload_info(struct seq_file *m, struct module *mod)
170ffc40f6SAaron Tomlin {
180ffc40f6SAaron Tomlin struct module_use *use;
190ffc40f6SAaron Tomlin int printed_something = 0;
200ffc40f6SAaron Tomlin
210ffc40f6SAaron Tomlin seq_printf(m, " %i ", module_refcount(mod));
220ffc40f6SAaron Tomlin
230ffc40f6SAaron Tomlin /*
240ffc40f6SAaron Tomlin * Always include a trailing , so userspace can differentiate
250ffc40f6SAaron Tomlin * between this and the old multi-field proc format.
260ffc40f6SAaron Tomlin */
270ffc40f6SAaron Tomlin list_for_each_entry(use, &mod->source_list, source_list) {
280ffc40f6SAaron Tomlin printed_something = 1;
290ffc40f6SAaron Tomlin seq_printf(m, "%s,", use->source->name);
300ffc40f6SAaron Tomlin }
310ffc40f6SAaron Tomlin
320ffc40f6SAaron Tomlin if (mod->init && !mod->exit) {
330ffc40f6SAaron Tomlin printed_something = 1;
340ffc40f6SAaron Tomlin seq_puts(m, "[permanent],");
350ffc40f6SAaron Tomlin }
360ffc40f6SAaron Tomlin
370ffc40f6SAaron Tomlin if (!printed_something)
380ffc40f6SAaron Tomlin seq_puts(m, "-");
390ffc40f6SAaron Tomlin }
400ffc40f6SAaron Tomlin #else /* !CONFIG_MODULE_UNLOAD */
print_unload_info(struct seq_file * m,struct module * mod)410ffc40f6SAaron Tomlin static inline void print_unload_info(struct seq_file *m, struct module *mod)
420ffc40f6SAaron Tomlin {
430ffc40f6SAaron Tomlin /* We don't know the usage count, or what modules are using. */
440ffc40f6SAaron Tomlin seq_puts(m, " - -");
450ffc40f6SAaron Tomlin }
460ffc40f6SAaron Tomlin #endif /* CONFIG_MODULE_UNLOAD */
470ffc40f6SAaron Tomlin
480ffc40f6SAaron Tomlin /* Called by the /proc file system to return a list of modules. */
m_start(struct seq_file * m,loff_t * pos)490ffc40f6SAaron Tomlin static void *m_start(struct seq_file *m, loff_t *pos)
500ffc40f6SAaron Tomlin {
510ffc40f6SAaron Tomlin mutex_lock(&module_mutex);
520ffc40f6SAaron Tomlin return seq_list_start(&modules, *pos);
530ffc40f6SAaron Tomlin }
540ffc40f6SAaron Tomlin
m_next(struct seq_file * m,void * p,loff_t * pos)550ffc40f6SAaron Tomlin static void *m_next(struct seq_file *m, void *p, loff_t *pos)
560ffc40f6SAaron Tomlin {
570ffc40f6SAaron Tomlin return seq_list_next(p, &modules, pos);
580ffc40f6SAaron Tomlin }
590ffc40f6SAaron Tomlin
m_stop(struct seq_file * m,void * p)600ffc40f6SAaron Tomlin static void m_stop(struct seq_file *m, void *p)
610ffc40f6SAaron Tomlin {
620ffc40f6SAaron Tomlin mutex_unlock(&module_mutex);
630ffc40f6SAaron Tomlin }
640ffc40f6SAaron Tomlin
module_total_size(struct module * mod)65*ac3b4328SSong Liu static unsigned int module_total_size(struct module *mod)
66*ac3b4328SSong Liu {
67*ac3b4328SSong Liu int size = 0;
68*ac3b4328SSong Liu
69*ac3b4328SSong Liu for_each_mod_mem_type(type)
70*ac3b4328SSong Liu size += mod->mem[type].size;
71*ac3b4328SSong Liu return size;
72*ac3b4328SSong Liu }
73*ac3b4328SSong Liu
m_show(struct seq_file * m,void * p)740ffc40f6SAaron Tomlin static int m_show(struct seq_file *m, void *p)
750ffc40f6SAaron Tomlin {
760ffc40f6SAaron Tomlin struct module *mod = list_entry(p, struct module, list);
770ffc40f6SAaron Tomlin char buf[MODULE_FLAGS_BUF_SIZE];
780ffc40f6SAaron Tomlin void *value;
7901dc0386SChristophe Leroy unsigned int size;
800ffc40f6SAaron Tomlin
810ffc40f6SAaron Tomlin /* We always ignore unformed modules. */
820ffc40f6SAaron Tomlin if (mod->state == MODULE_STATE_UNFORMED)
830ffc40f6SAaron Tomlin return 0;
840ffc40f6SAaron Tomlin
85*ac3b4328SSong Liu size = module_total_size(mod);
8601dc0386SChristophe Leroy seq_printf(m, "%s %u", mod->name, size);
870ffc40f6SAaron Tomlin print_unload_info(m, mod);
880ffc40f6SAaron Tomlin
890ffc40f6SAaron Tomlin /* Informative for users. */
900ffc40f6SAaron Tomlin seq_printf(m, " %s",
910ffc40f6SAaron Tomlin mod->state == MODULE_STATE_GOING ? "Unloading" :
920ffc40f6SAaron Tomlin mod->state == MODULE_STATE_COMING ? "Loading" :
930ffc40f6SAaron Tomlin "Live");
940ffc40f6SAaron Tomlin /* Used by oprofile and other similar tools. */
95*ac3b4328SSong Liu value = m->private ? NULL : mod->mem[MOD_TEXT].base;
960ffc40f6SAaron Tomlin seq_printf(m, " 0x%px", value);
970ffc40f6SAaron Tomlin
980ffc40f6SAaron Tomlin /* Taints info */
990ffc40f6SAaron Tomlin if (mod->taints)
10017dd25c2SAaron Tomlin seq_printf(m, " %s", module_flags(mod, buf, true));
1010ffc40f6SAaron Tomlin
1020ffc40f6SAaron Tomlin seq_puts(m, "\n");
1030ffc40f6SAaron Tomlin return 0;
1040ffc40f6SAaron Tomlin }
1050ffc40f6SAaron Tomlin
1060ffc40f6SAaron Tomlin /*
1070ffc40f6SAaron Tomlin * Format: modulename size refcount deps address
1080ffc40f6SAaron Tomlin *
1090ffc40f6SAaron Tomlin * Where refcount is a number or -, and deps is a comma-separated list
1100ffc40f6SAaron Tomlin * of depends or -.
1110ffc40f6SAaron Tomlin */
1120ffc40f6SAaron Tomlin static const struct seq_operations modules_op = {
1130ffc40f6SAaron Tomlin .start = m_start,
1140ffc40f6SAaron Tomlin .next = m_next,
1150ffc40f6SAaron Tomlin .stop = m_stop,
1160ffc40f6SAaron Tomlin .show = m_show
1170ffc40f6SAaron Tomlin };
1180ffc40f6SAaron Tomlin
1190ffc40f6SAaron Tomlin /*
1200ffc40f6SAaron Tomlin * This also sets the "private" pointer to non-NULL if the
1210ffc40f6SAaron Tomlin * kernel pointers should be hidden (so you can just test
1220ffc40f6SAaron Tomlin * "m->private" to see if you should keep the values private).
1230ffc40f6SAaron Tomlin *
1240ffc40f6SAaron Tomlin * We use the same logic as for /proc/kallsyms.
1250ffc40f6SAaron Tomlin */
modules_open(struct inode * inode,struct file * file)1260ffc40f6SAaron Tomlin static int modules_open(struct inode *inode, struct file *file)
1270ffc40f6SAaron Tomlin {
1280ffc40f6SAaron Tomlin int err = seq_open(file, &modules_op);
1290ffc40f6SAaron Tomlin
1300ffc40f6SAaron Tomlin if (!err) {
1310ffc40f6SAaron Tomlin struct seq_file *m = file->private_data;
1320ffc40f6SAaron Tomlin
1330ffc40f6SAaron Tomlin m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul;
1340ffc40f6SAaron Tomlin }
1350ffc40f6SAaron Tomlin
1360ffc40f6SAaron Tomlin return err;
1370ffc40f6SAaron Tomlin }
1380ffc40f6SAaron Tomlin
1390ffc40f6SAaron Tomlin static const struct proc_ops modules_proc_ops = {
1400ffc40f6SAaron Tomlin .proc_flags = PROC_ENTRY_PERMANENT,
1410ffc40f6SAaron Tomlin .proc_open = modules_open,
1420ffc40f6SAaron Tomlin .proc_read = seq_read,
1430ffc40f6SAaron Tomlin .proc_lseek = seq_lseek,
1440ffc40f6SAaron Tomlin .proc_release = seq_release,
1450ffc40f6SAaron Tomlin };
1460ffc40f6SAaron Tomlin
proc_modules_init(void)1470ffc40f6SAaron Tomlin static int __init proc_modules_init(void)
1480ffc40f6SAaron Tomlin {
1490ffc40f6SAaron Tomlin proc_create("modules", 0, NULL, &modules_proc_ops);
1500ffc40f6SAaron Tomlin return 0;
1510ffc40f6SAaron Tomlin }
1520ffc40f6SAaron Tomlin module_init(proc_modules_init);
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