![Rusty Russell](/assets/img/avatar_default.png)
We do a very simple search for a particular string appended to the module (which is cache-hot and about to be SHA'd anyway). There's both a config option and a boot parameter which control whether we accept or fail with unsigned modules and modules that are signed with an unknown key. If module signing is enabled, the kernel will be tainted if a module is loaded that is unsigned or has a signature for which we don't have the key. (Useful feedback and tweaks by David Howells <dhowells@redhat.com>) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
660 lines
18 KiB
C
660 lines
18 KiB
C
#ifndef _LINUX_MODULE_H
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#define _LINUX_MODULE_H
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/*
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* Dynamic loading of modules into the kernel.
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*
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* Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
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* Rewritten again by Rusty Russell, 2002
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*/
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#include <linux/list.h>
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#include <linux/stat.h>
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#include <linux/compiler.h>
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#include <linux/cache.h>
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#include <linux/kmod.h>
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#include <linux/elf.h>
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#include <linux/stringify.h>
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#include <linux/kobject.h>
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#include <linux/moduleparam.h>
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#include <linux/tracepoint.h>
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#include <linux/export.h>
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#include <linux/percpu.h>
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#include <asm/module.h>
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/* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
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#define MODULE_SIG_STRING "~Module signature appended~\n"
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/* Not Yet Implemented */
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#define MODULE_SUPPORTED_DEVICE(name)
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#define MODULE_NAME_LEN MAX_PARAM_PREFIX_LEN
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struct modversion_info
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{
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unsigned long crc;
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char name[MODULE_NAME_LEN];
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};
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struct module;
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struct module_kobject {
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struct kobject kobj;
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struct module *mod;
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struct kobject *drivers_dir;
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struct module_param_attrs *mp;
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};
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struct module_attribute {
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struct attribute attr;
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ssize_t (*show)(struct module_attribute *, struct module_kobject *,
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char *);
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ssize_t (*store)(struct module_attribute *, struct module_kobject *,
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const char *, size_t count);
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void (*setup)(struct module *, const char *);
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int (*test)(struct module *);
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void (*free)(struct module *);
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};
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struct module_version_attribute {
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struct module_attribute mattr;
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const char *module_name;
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const char *version;
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} __attribute__ ((__aligned__(sizeof(void *))));
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extern ssize_t __modver_version_show(struct module_attribute *,
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struct module_kobject *, char *);
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extern struct module_attribute module_uevent;
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/* These are either module local, or the kernel's dummy ones. */
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extern int init_module(void);
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extern void cleanup_module(void);
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/* Archs provide a method of finding the correct exception table. */
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struct exception_table_entry;
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const struct exception_table_entry *
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search_extable(const struct exception_table_entry *first,
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const struct exception_table_entry *last,
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unsigned long value);
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void sort_extable(struct exception_table_entry *start,
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struct exception_table_entry *finish);
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void sort_main_extable(void);
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void trim_init_extable(struct module *m);
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#ifdef MODULE
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#define MODULE_GENERIC_TABLE(gtype,name) \
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extern const struct gtype##_id __mod_##gtype##_table \
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__attribute__ ((unused, alias(__stringify(name))))
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#else /* !MODULE */
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#define MODULE_GENERIC_TABLE(gtype,name)
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#endif
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/* Generic info of form tag = "info" */
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#define MODULE_INFO(tag, info) __MODULE_INFO(tag, tag, info)
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/* For userspace: you can also call me... */
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#define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
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/*
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* The following license idents are currently accepted as indicating free
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* software modules
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*
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* "GPL" [GNU Public License v2 or later]
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* "GPL v2" [GNU Public License v2]
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* "GPL and additional rights" [GNU Public License v2 rights and more]
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* "Dual BSD/GPL" [GNU Public License v2
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* or BSD license choice]
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* "Dual MIT/GPL" [GNU Public License v2
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* or MIT license choice]
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* "Dual MPL/GPL" [GNU Public License v2
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* or Mozilla license choice]
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*
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* The following other idents are available
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*
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* "Proprietary" [Non free products]
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*
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* There are dual licensed components, but when running with Linux it is the
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* GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
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* is a GPL combined work.
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*
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* This exists for several reasons
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* 1. So modinfo can show license info for users wanting to vet their setup
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* is free
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* 2. So the community can ignore bug reports including proprietary modules
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* 3. So vendors can do likewise based on their own policies
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*/
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#define MODULE_LICENSE(_license) MODULE_INFO(license, _license)
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/*
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* Author(s), use "Name <email>" or just "Name", for multiple
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* authors use multiple MODULE_AUTHOR() statements/lines.
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*/
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#define MODULE_AUTHOR(_author) MODULE_INFO(author, _author)
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/* What your module does. */
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#define MODULE_DESCRIPTION(_description) MODULE_INFO(description, _description)
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#define MODULE_DEVICE_TABLE(type,name) \
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MODULE_GENERIC_TABLE(type##_device,name)
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/* Version of form [<epoch>:]<version>[-<extra-version>].
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Or for CVS/RCS ID version, everything but the number is stripped.
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<epoch>: A (small) unsigned integer which allows you to start versions
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anew. If not mentioned, it's zero. eg. "2:1.0" is after
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"1:2.0".
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<version>: The <version> may contain only alphanumerics and the
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character `.'. Ordered by numeric sort for numeric parts,
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ascii sort for ascii parts (as per RPM or DEB algorithm).
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<extraversion>: Like <version>, but inserted for local
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customizations, eg "rh3" or "rusty1".
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Using this automatically adds a checksum of the .c files and the
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local headers in "srcversion".
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*/
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#if defined(MODULE) || !defined(CONFIG_SYSFS)
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#define MODULE_VERSION(_version) MODULE_INFO(version, _version)
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#else
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#define MODULE_VERSION(_version) \
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static struct module_version_attribute ___modver_attr = { \
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.mattr = { \
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.attr = { \
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.name = "version", \
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.mode = S_IRUGO, \
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}, \
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.show = __modver_version_show, \
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}, \
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.module_name = KBUILD_MODNAME, \
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.version = _version, \
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}; \
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static const struct module_version_attribute \
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__used __attribute__ ((__section__ ("__modver"))) \
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* __moduleparam_const __modver_attr = &___modver_attr
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#endif
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/* Optional firmware file (or files) needed by the module
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* format is simply firmware file name. Multiple firmware
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* files require multiple MODULE_FIRMWARE() specifiers */
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#define MODULE_FIRMWARE(_firmware) MODULE_INFO(firmware, _firmware)
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/* Given an address, look for it in the exception tables */
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const struct exception_table_entry *search_exception_tables(unsigned long add);
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struct notifier_block;
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#ifdef CONFIG_MODULES
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extern int modules_disabled; /* for sysctl */
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/* Get/put a kernel symbol (calls must be symmetric) */
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void *__symbol_get(const char *symbol);
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void *__symbol_get_gpl(const char *symbol);
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#define symbol_get(x) ((typeof(&x))(__symbol_get(MODULE_SYMBOL_PREFIX #x)))
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/* modules using other modules: kdb wants to see this. */
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struct module_use {
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struct list_head source_list;
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struct list_head target_list;
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struct module *source, *target;
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};
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enum module_state
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{
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MODULE_STATE_LIVE,
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MODULE_STATE_COMING,
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MODULE_STATE_GOING,
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};
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/**
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* struct module_ref - per cpu module reference counts
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* @incs: number of module get on this cpu
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* @decs: number of module put on this cpu
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*
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* We force an alignment on 8 or 16 bytes, so that alloc_percpu()
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* put @incs/@decs in same cache line, with no extra memory cost,
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* since alloc_percpu() is fine grained.
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*/
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struct module_ref {
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unsigned long incs;
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unsigned long decs;
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} __attribute((aligned(2 * sizeof(unsigned long))));
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struct module
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{
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enum module_state state;
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/* Member of list of modules */
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struct list_head list;
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/* Unique handle for this module */
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char name[MODULE_NAME_LEN];
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/* Sysfs stuff. */
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struct module_kobject mkobj;
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struct module_attribute *modinfo_attrs;
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const char *version;
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const char *srcversion;
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struct kobject *holders_dir;
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/* Exported symbols */
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const struct kernel_symbol *syms;
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const unsigned long *crcs;
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unsigned int num_syms;
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/* Kernel parameters. */
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struct kernel_param *kp;
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unsigned int num_kp;
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/* GPL-only exported symbols. */
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unsigned int num_gpl_syms;
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const struct kernel_symbol *gpl_syms;
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const unsigned long *gpl_crcs;
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#ifdef CONFIG_UNUSED_SYMBOLS
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/* unused exported symbols. */
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const struct kernel_symbol *unused_syms;
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const unsigned long *unused_crcs;
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unsigned int num_unused_syms;
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/* GPL-only, unused exported symbols. */
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unsigned int num_unused_gpl_syms;
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const struct kernel_symbol *unused_gpl_syms;
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const unsigned long *unused_gpl_crcs;
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#endif
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#ifdef CONFIG_MODULE_SIG
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/* Signature was verified. */
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bool sig_ok;
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#endif
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/* symbols that will be GPL-only in the near future. */
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const struct kernel_symbol *gpl_future_syms;
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const unsigned long *gpl_future_crcs;
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unsigned int num_gpl_future_syms;
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/* Exception table */
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unsigned int num_exentries;
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struct exception_table_entry *extable;
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/* Startup function. */
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int (*init)(void);
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/* If this is non-NULL, vfree after init() returns */
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void *module_init;
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/* Here is the actual code + data, vfree'd on unload. */
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void *module_core;
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/* Here are the sizes of the init and core sections */
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unsigned int init_size, core_size;
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/* The size of the executable code in each section. */
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unsigned int init_text_size, core_text_size;
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/* Size of RO sections of the module (text+rodata) */
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unsigned int init_ro_size, core_ro_size;
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/* Arch-specific module values */
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struct mod_arch_specific arch;
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unsigned int taints; /* same bits as kernel:tainted */
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#ifdef CONFIG_GENERIC_BUG
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/* Support for BUG */
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unsigned num_bugs;
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struct list_head bug_list;
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struct bug_entry *bug_table;
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#endif
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#ifdef CONFIG_KALLSYMS
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/*
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* We keep the symbol and string tables for kallsyms.
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* The core_* fields below are temporary, loader-only (they
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* could really be discarded after module init).
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*/
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Elf_Sym *symtab, *core_symtab;
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unsigned int num_symtab, core_num_syms;
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char *strtab, *core_strtab;
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/* Section attributes */
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struct module_sect_attrs *sect_attrs;
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/* Notes attributes */
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struct module_notes_attrs *notes_attrs;
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#endif
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/* The command line arguments (may be mangled). People like
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keeping pointers to this stuff */
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char *args;
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#ifdef CONFIG_SMP
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/* Per-cpu data. */
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void __percpu *percpu;
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unsigned int percpu_size;
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#endif
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#ifdef CONFIG_TRACEPOINTS
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unsigned int num_tracepoints;
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struct tracepoint * const *tracepoints_ptrs;
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#endif
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#ifdef HAVE_JUMP_LABEL
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struct jump_entry *jump_entries;
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unsigned int num_jump_entries;
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#endif
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#ifdef CONFIG_TRACING
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unsigned int num_trace_bprintk_fmt;
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const char **trace_bprintk_fmt_start;
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#endif
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#ifdef CONFIG_EVENT_TRACING
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struct ftrace_event_call **trace_events;
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unsigned int num_trace_events;
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#endif
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#ifdef CONFIG_FTRACE_MCOUNT_RECORD
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unsigned int num_ftrace_callsites;
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unsigned long *ftrace_callsites;
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#endif
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#ifdef CONFIG_MODULE_UNLOAD
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/* What modules depend on me? */
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struct list_head source_list;
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/* What modules do I depend on? */
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struct list_head target_list;
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/* Who is waiting for us to be unloaded */
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struct task_struct *waiter;
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/* Destruction function. */
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void (*exit)(void);
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struct module_ref __percpu *refptr;
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#endif
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#ifdef CONFIG_CONSTRUCTORS
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/* Constructor functions. */
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ctor_fn_t *ctors;
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unsigned int num_ctors;
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#endif
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};
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#ifndef MODULE_ARCH_INIT
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#define MODULE_ARCH_INIT {}
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#endif
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extern struct mutex module_mutex;
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/* FIXME: It'd be nice to isolate modules during init, too, so they
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aren't used before they (may) fail. But presently too much code
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(IDE & SCSI) require entry into the module during init.*/
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static inline int module_is_live(struct module *mod)
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{
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return mod->state != MODULE_STATE_GOING;
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}
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struct module *__module_text_address(unsigned long addr);
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struct module *__module_address(unsigned long addr);
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bool is_module_address(unsigned long addr);
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bool is_module_percpu_address(unsigned long addr);
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bool is_module_text_address(unsigned long addr);
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static inline int within_module_core(unsigned long addr, struct module *mod)
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{
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return (unsigned long)mod->module_core <= addr &&
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addr < (unsigned long)mod->module_core + mod->core_size;
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}
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static inline int within_module_init(unsigned long addr, struct module *mod)
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{
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return (unsigned long)mod->module_init <= addr &&
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addr < (unsigned long)mod->module_init + mod->init_size;
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}
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/* Search for module by name: must hold module_mutex. */
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struct module *find_module(const char *name);
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struct symsearch {
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const struct kernel_symbol *start, *stop;
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const unsigned long *crcs;
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enum {
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NOT_GPL_ONLY,
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GPL_ONLY,
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WILL_BE_GPL_ONLY,
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} licence;
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bool unused;
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};
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/* Search for an exported symbol by name. */
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const struct kernel_symbol *find_symbol(const char *name,
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struct module **owner,
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const unsigned long **crc,
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bool gplok,
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bool warn);
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/* Walk the exported symbol table */
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bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
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struct module *owner,
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void *data), void *data);
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/* Returns 0 and fills in value, defined and namebuf, or -ERANGE if
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symnum out of range. */
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int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
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char *name, char *module_name, int *exported);
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/* Look for this name: can be of form module:name. */
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unsigned long module_kallsyms_lookup_name(const char *name);
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int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
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struct module *, unsigned long),
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void *data);
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extern void __module_put_and_exit(struct module *mod, long code)
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__attribute__((noreturn));
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#define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code);
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#ifdef CONFIG_MODULE_UNLOAD
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unsigned long module_refcount(struct module *mod);
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void __symbol_put(const char *symbol);
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#define symbol_put(x) __symbol_put(MODULE_SYMBOL_PREFIX #x)
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void symbol_put_addr(void *addr);
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/* Sometimes we know we already have a refcount, and it's easier not
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to handle the error case (which only happens with rmmod --wait). */
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extern void __module_get(struct module *module);
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/* This is the Right Way to get a module: if it fails, it's being removed,
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* so pretend it's not there. */
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extern bool try_module_get(struct module *module);
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extern void module_put(struct module *module);
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#else /*!CONFIG_MODULE_UNLOAD*/
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static inline int try_module_get(struct module *module)
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{
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return !module || module_is_live(module);
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}
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static inline void module_put(struct module *module)
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{
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}
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static inline void __module_get(struct module *module)
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{
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}
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#define symbol_put(x) do { } while(0)
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#define symbol_put_addr(p) do { } while(0)
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#endif /* CONFIG_MODULE_UNLOAD */
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int ref_module(struct module *a, struct module *b);
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/* This is a #define so the string doesn't get put in every .o file */
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#define module_name(mod) \
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({ \
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struct module *__mod = (mod); \
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__mod ? __mod->name : "kernel"; \
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})
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/* For kallsyms to ask for address resolution. namebuf should be at
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* least KSYM_NAME_LEN long: a pointer to namebuf is returned if
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* found, otherwise NULL. */
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const char *module_address_lookup(unsigned long addr,
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unsigned long *symbolsize,
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unsigned long *offset,
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char **modname,
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char *namebuf);
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int lookup_module_symbol_name(unsigned long addr, char *symname);
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int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name);
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/* For extable.c to search modules' exception tables. */
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const struct exception_table_entry *search_module_extables(unsigned long addr);
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int register_module_notifier(struct notifier_block * nb);
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int unregister_module_notifier(struct notifier_block * nb);
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extern void print_modules(void);
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#else /* !CONFIG_MODULES... */
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/* Given an address, look for it in the exception tables. */
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static inline const struct exception_table_entry *
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search_module_extables(unsigned long addr)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct module *__module_address(unsigned long addr)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct module *__module_text_address(unsigned long addr)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline bool is_module_address(unsigned long addr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_module_percpu_address(unsigned long addr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_module_text_address(unsigned long addr)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/* Get/put a kernel symbol (calls should be symmetric) */
|
|
#define symbol_get(x) ({ extern typeof(x) x __attribute__((weak)); &(x); })
|
|
#define symbol_put(x) do { } while(0)
|
|
#define symbol_put_addr(x) do { } while(0)
|
|
|
|
static inline void __module_get(struct module *module)
|
|
{
|
|
}
|
|
|
|
static inline int try_module_get(struct module *module)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline void module_put(struct module *module)
|
|
{
|
|
}
|
|
|
|
#define module_name(mod) "kernel"
|
|
|
|
/* For kallsyms to ask for address resolution. NULL means not found. */
|
|
static inline const char *module_address_lookup(unsigned long addr,
|
|
unsigned long *symbolsize,
|
|
unsigned long *offset,
|
|
char **modname,
|
|
char *namebuf)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int lookup_module_symbol_name(unsigned long addr, char *symname)
|
|
{
|
|
return -ERANGE;
|
|
}
|
|
|
|
static inline int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name)
|
|
{
|
|
return -ERANGE;
|
|
}
|
|
|
|
static inline int module_get_kallsym(unsigned int symnum, unsigned long *value,
|
|
char *type, char *name,
|
|
char *module_name, int *exported)
|
|
{
|
|
return -ERANGE;
|
|
}
|
|
|
|
static inline unsigned long module_kallsyms_lookup_name(const char *name)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
|
|
struct module *,
|
|
unsigned long),
|
|
void *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int register_module_notifier(struct notifier_block * nb)
|
|
{
|
|
/* no events will happen anyway, so this can always succeed */
|
|
return 0;
|
|
}
|
|
|
|
static inline int unregister_module_notifier(struct notifier_block * nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#define module_put_and_exit(code) do_exit(code)
|
|
|
|
static inline void print_modules(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MODULES */
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
extern struct kset *module_kset;
|
|
extern struct kobj_type module_ktype;
|
|
extern int module_sysfs_initialized;
|
|
#endif /* CONFIG_SYSFS */
|
|
|
|
#define symbol_request(x) try_then_request_module(symbol_get(x), "symbol:" #x)
|
|
|
|
/* BELOW HERE ALL THESE ARE OBSOLETE AND WILL VANISH */
|
|
|
|
#define __MODULE_STRING(x) __stringify(x)
|
|
|
|
#ifdef CONFIG_DEBUG_SET_MODULE_RONX
|
|
extern void set_all_modules_text_rw(void);
|
|
extern void set_all_modules_text_ro(void);
|
|
#else
|
|
static inline void set_all_modules_text_rw(void) { }
|
|
static inline void set_all_modules_text_ro(void) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_GENERIC_BUG
|
|
void module_bug_finalize(const Elf_Ehdr *, const Elf_Shdr *,
|
|
struct module *);
|
|
void module_bug_cleanup(struct module *);
|
|
|
|
#else /* !CONFIG_GENERIC_BUG */
|
|
|
|
static inline void module_bug_finalize(const Elf_Ehdr *hdr,
|
|
const Elf_Shdr *sechdrs,
|
|
struct module *mod)
|
|
{
|
|
}
|
|
static inline void module_bug_cleanup(struct module *mod) {}
|
|
#endif /* CONFIG_GENERIC_BUG */
|
|
|
|
#endif /* _LINUX_MODULE_H */
|