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module: Move procfs support into a separate file
No functional change. This patch migrates code that allows one to generate a list of loaded/or linked modules via /proc when procfs support is enabled into kernel/module/procfs.c. Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Aaron Tomlin <atomlin@redhat.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Aaron Tomlin
Luis Chamberlain
parent
08126db5ff
commit
0ffc40f6c8
@ -15,3 +15,4 @@ obj-$(CONFIG_MODULES_TREE_LOOKUP) += tree_lookup.o
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obj-$(CONFIG_STRICT_MODULE_RWX) += strict_rwx.o
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obj-$(CONFIG_DEBUG_KMEMLEAK) += debug_kmemleak.o
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obj-$(CONFIG_KALLSYMS) += kallsyms.o
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obj-$(CONFIG_PROC_FS) += procfs.o
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@ -72,6 +72,7 @@ struct module *find_module_all(const char *name, size_t len, bool even_unformed)
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int cmp_name(const void *name, const void *sym);
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long module_get_offset(struct module *mod, unsigned int *size, Elf_Shdr *sechdr,
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unsigned int section);
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char *module_flags(struct module *mod, char *buf);
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static inline unsigned long kernel_symbol_value(const struct kernel_symbol *sym)
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{
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@ -22,7 +22,6 @@
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/elf.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/fcntl.h>
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@ -805,31 +804,6 @@ out:
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return ret;
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}
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static inline void print_unload_info(struct seq_file *m, struct module *mod)
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{
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struct module_use *use;
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int printed_something = 0;
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seq_printf(m, " %i ", module_refcount(mod));
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/*
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* Always include a trailing , so userspace can differentiate
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* between this and the old multi-field proc format.
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*/
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list_for_each_entry(use, &mod->source_list, source_list) {
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printed_something = 1;
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seq_printf(m, "%s,", use->source->name);
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}
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if (mod->init != NULL && mod->exit == NULL) {
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printed_something = 1;
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seq_puts(m, "[permanent],");
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}
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if (!printed_something)
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seq_puts(m, "-");
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}
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void __symbol_put(const char *symbol)
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{
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struct find_symbol_arg fsa = {
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@ -919,12 +893,6 @@ void module_put(struct module *module)
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EXPORT_SYMBOL(module_put);
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#else /* !CONFIG_MODULE_UNLOAD */
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static inline void print_unload_info(struct seq_file *m, struct module *mod)
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{
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/* We don't know the usage count, or what modules are using. */
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seq_puts(m, " - -");
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}
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static inline void module_unload_free(struct module *mod)
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{
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}
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@ -3596,7 +3564,7 @@ static void cfi_cleanup(struct module *mod)
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}
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/* Keep in sync with MODULE_FLAGS_BUF_SIZE !!! */
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static char *module_flags(struct module *mod, char *buf)
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char *module_flags(struct module *mod, char *buf)
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{
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int bx = 0;
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@ -3619,103 +3587,6 @@ static char *module_flags(struct module *mod, char *buf)
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return buf;
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}
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#ifdef CONFIG_PROC_FS
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/* Called by the /proc file system to return a list of modules. */
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static void *m_start(struct seq_file *m, loff_t *pos)
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{
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mutex_lock(&module_mutex);
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return seq_list_start(&modules, *pos);
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}
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static void *m_next(struct seq_file *m, void *p, loff_t *pos)
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{
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return seq_list_next(p, &modules, pos);
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}
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static void m_stop(struct seq_file *m, void *p)
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{
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mutex_unlock(&module_mutex);
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}
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static int m_show(struct seq_file *m, void *p)
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{
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struct module *mod = list_entry(p, struct module, list);
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char buf[MODULE_FLAGS_BUF_SIZE];
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void *value;
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/* We always ignore unformed modules. */
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if (mod->state == MODULE_STATE_UNFORMED)
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return 0;
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seq_printf(m, "%s %u",
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mod->name, mod->init_layout.size + mod->core_layout.size);
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print_unload_info(m, mod);
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/* Informative for users. */
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seq_printf(m, " %s",
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mod->state == MODULE_STATE_GOING ? "Unloading" :
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mod->state == MODULE_STATE_COMING ? "Loading" :
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"Live");
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/* Used by oprofile and other similar tools. */
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value = m->private ? NULL : mod->core_layout.base;
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seq_printf(m, " 0x%px", value);
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/* Taints info */
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if (mod->taints)
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seq_printf(m, " %s", module_flags(mod, buf));
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seq_puts(m, "\n");
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return 0;
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}
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/*
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* Format: modulename size refcount deps address
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*
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* Where refcount is a number or -, and deps is a comma-separated list
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* of depends or -.
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*/
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static const struct seq_operations modules_op = {
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.start = m_start,
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.next = m_next,
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.stop = m_stop,
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.show = m_show
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};
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/*
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* This also sets the "private" pointer to non-NULL if the
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* kernel pointers should be hidden (so you can just test
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* "m->private" to see if you should keep the values private).
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*
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* We use the same logic as for /proc/kallsyms.
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*/
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static int modules_open(struct inode *inode, struct file *file)
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{
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int err = seq_open(file, &modules_op);
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if (!err) {
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struct seq_file *m = file->private_data;
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m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul;
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}
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return err;
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}
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static const struct proc_ops modules_proc_ops = {
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.proc_flags = PROC_ENTRY_PERMANENT,
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.proc_open = modules_open,
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.proc_read = seq_read,
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.proc_lseek = seq_lseek,
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.proc_release = seq_release,
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};
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static int __init proc_modules_init(void)
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{
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proc_create("modules", 0, NULL, &modules_proc_ops);
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return 0;
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}
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module_init(proc_modules_init);
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#endif
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/* Given an address, look for it in the module exception tables. */
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const struct exception_table_entry *search_module_extables(unsigned long addr)
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{
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142
kernel/module/procfs.c
Normal file
142
kernel/module/procfs.c
Normal file
@ -0,0 +1,142 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Module proc support
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*
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* Copyright (C) 2008 Alexey Dobriyan
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*/
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/mutex.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include "internal.h"
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#ifdef CONFIG_MODULE_UNLOAD
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static inline void print_unload_info(struct seq_file *m, struct module *mod)
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{
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struct module_use *use;
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int printed_something = 0;
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seq_printf(m, " %i ", module_refcount(mod));
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/*
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* Always include a trailing , so userspace can differentiate
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* between this and the old multi-field proc format.
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*/
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list_for_each_entry(use, &mod->source_list, source_list) {
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printed_something = 1;
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seq_printf(m, "%s,", use->source->name);
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}
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if (mod->init && !mod->exit) {
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printed_something = 1;
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seq_puts(m, "[permanent],");
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}
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if (!printed_something)
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seq_puts(m, "-");
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}
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#else /* !CONFIG_MODULE_UNLOAD */
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static inline void print_unload_info(struct seq_file *m, struct module *mod)
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{
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/* We don't know the usage count, or what modules are using. */
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seq_puts(m, " - -");
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}
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#endif /* CONFIG_MODULE_UNLOAD */
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/* Called by the /proc file system to return a list of modules. */
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static void *m_start(struct seq_file *m, loff_t *pos)
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{
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mutex_lock(&module_mutex);
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return seq_list_start(&modules, *pos);
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}
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static void *m_next(struct seq_file *m, void *p, loff_t *pos)
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{
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return seq_list_next(p, &modules, pos);
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}
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static void m_stop(struct seq_file *m, void *p)
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{
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mutex_unlock(&module_mutex);
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}
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static int m_show(struct seq_file *m, void *p)
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{
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struct module *mod = list_entry(p, struct module, list);
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char buf[MODULE_FLAGS_BUF_SIZE];
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void *value;
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/* We always ignore unformed modules. */
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if (mod->state == MODULE_STATE_UNFORMED)
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return 0;
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seq_printf(m, "%s %u",
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mod->name, mod->init_layout.size + mod->core_layout.size);
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print_unload_info(m, mod);
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/* Informative for users. */
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seq_printf(m, " %s",
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mod->state == MODULE_STATE_GOING ? "Unloading" :
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mod->state == MODULE_STATE_COMING ? "Loading" :
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"Live");
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/* Used by oprofile and other similar tools. */
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value = m->private ? NULL : mod->core_layout.base;
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seq_printf(m, " 0x%px", value);
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/* Taints info */
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if (mod->taints)
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seq_printf(m, " %s", module_flags(mod, buf));
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seq_puts(m, "\n");
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return 0;
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}
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/*
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* Format: modulename size refcount deps address
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*
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* Where refcount is a number or -, and deps is a comma-separated list
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* of depends or -.
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*/
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static const struct seq_operations modules_op = {
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.start = m_start,
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.next = m_next,
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.stop = m_stop,
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.show = m_show
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};
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/*
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* This also sets the "private" pointer to non-NULL if the
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* kernel pointers should be hidden (so you can just test
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* "m->private" to see if you should keep the values private).
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*
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* We use the same logic as for /proc/kallsyms.
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*/
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static int modules_open(struct inode *inode, struct file *file)
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{
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int err = seq_open(file, &modules_op);
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if (!err) {
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struct seq_file *m = file->private_data;
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m->private = kallsyms_show_value(file->f_cred) ? NULL : (void *)8ul;
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}
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return err;
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}
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static const struct proc_ops modules_proc_ops = {
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.proc_flags = PROC_ENTRY_PERMANENT,
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.proc_open = modules_open,
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.proc_read = seq_read,
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.proc_lseek = seq_lseek,
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.proc_release = seq_release,
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};
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static int __init proc_modules_init(void)
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{
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proc_create("modules", 0, NULL, &modules_proc_ops);
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return 0;
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}
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module_init(proc_modules_init);
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