mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-10 20:44:09 +08:00
17dd25c29c
No functional change. With this patch a given module's state information (i.e. 'mod->state') can be omitted from the specified buffer. Please note that this is in preparation to include the last unloaded module's taint flag(s), if available. Signed-off-by: Aaron Tomlin <atomlin@redhat.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
// 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_UNLOAD
|
|
static 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 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 = mod->init_layout.size + mod->core_layout.size;
|
|
#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
|
|
size += mod->data_layout.size;
|
|
#endif
|
|
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->core_layout.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);
|