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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153// SPDX-License-Identifier: GPL-2.0-or-later/* * Module proc support * * Copyright (C) 2008 Alexey Dobriyan */
#include <linux/module.h>#include <linux/kallsyms.h>#include <linux/mutex.h>#include <linux/seq_file.h>#include <linux/proc_fs.h>#include "internal.h"
#ifdef CONFIG_MODULE_UNLOADstatic inline void print_unload_info(struct seq_file *m, struct module *mod){ struct module_use *use; int printed_something = 0;
seq_printf(m, " %i ", module_refcount(mod));
/* * Always include a trailing , so userspace can differentiate * between this and the old multi-field proc format. */ list_for_each_entry(use, &mod->source_list, source_list) { printed_something = 1; seq_printf(m, "%s,", use->source->name); }
if (mod->init && !mod->exit) { printed_something = 1; seq_puts(m, "[permanent],"); }
if (!printed_something) seq_puts(m, "-");}#else /* !CONFIG_MODULE_UNLOAD */static inline void print_unload_info(struct seq_file *m, struct module *mod){ /* We don't know the usage count, or what modules are using. */ seq_puts(m, " - -");}#endif /* CONFIG_MODULE_UNLOAD */
/* Called by the /proc file system to return a list of modules. */static void *m_start(struct seq_file *m, loff_t *pos){ mutex_lock(&module_mutex); return seq_list_start(&modules, *pos);}
static void *m_next(struct seq_file *m, void *p, loff_t *pos){ return seq_list_next(p, &modules, pos);}
static void m_stop(struct seq_file *m, void *p){ mutex_unlock(&module_mutex);}
static unsigned int module_total_size(struct module *mod){ int size = 0;
for_each_mod_mem_type(type) size += mod->mem[type].size; return size;}
static int m_show(struct seq_file *m, void *p){ struct module *mod = list_entry(p, struct module, list); char buf[MODULE_FLAGS_BUF_SIZE]; void *value; unsigned int size;
/* We always ignore unformed modules. */ if (mod->state == MODULE_STATE_UNFORMED) return 0;
size = module_total_size(mod); seq_printf(m, "%s %u", mod->name, size); print_unload_info(m, mod);
/* Informative for users. */ seq_printf(m, " %s", mod->state == MODULE_STATE_GOING ? "Unloading" : mod->state == MODULE_STATE_COMING ? "Loading" : "Live"); /* Used by oprofile and other similar tools. */ value = m->private ? NULL : mod->mem[MOD_TEXT].base; seq_printf(m, " 0x%px", value);
/* Taints info */ if (mod->taints) seq_printf(m, " %s", module_flags(mod, buf, true));
seq_puts(m, "\n"); return 0;}
/* * Format: modulename size refcount deps address * * Where refcount is a number or -, and deps is a comma-separated list * of depends or -. */static const struct seq_operations modules_op = { .start = m_start, .next = m_next, .stop = m_stop, .show = m_show};
/* * This also sets the "private" pointer to non-NULL if the * kernel pointers should be hidden (so you can just test * "m->private" to see if you should keep the values private). * * We use the same logic as for /proc/kallsyms. */static int modules_open(struct inode *inode, struct file *file){ int err = seq_open(file, &modules_op);
if (!err) { struct seq_file *m = file->private_data;
m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul; }
return err;}
static const struct proc_ops modules_proc_ops = { .proc_flags = PROC_ENTRY_PERMANENT, .proc_open = modules_open, .proc_read = seq_read, .proc_lseek = seq_lseek, .proc_release = seq_release,};
static int __init proc_modules_init(void){ proc_create("modules", 0, NULL, &modules_proc_ops); return 0;}module_init(proc_modules_init);