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![Robert P. J. Day](/assets/img/avatar_default.png)
Fix minor (comment) typoes in kernel/module.c. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Adrian Bunk <bunk@stusta.de>
2499 lines
64 KiB
C
2499 lines
64 KiB
C
/*
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Copyright (C) 2002 Richard Henderson
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Copyright (C) 2001 Rusty Russell, 2002 Rusty Russell IBM.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/moduleloader.h>
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#include <linux/init.h>
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#include <linux/kallsyms.h>
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#include <linux/kernel.h>
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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/seq_file.h>
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#include <linux/syscalls.h>
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#include <linux/fcntl.h>
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#include <linux/rcupdate.h>
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#include <linux/capability.h>
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#include <linux/cpu.h>
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#include <linux/moduleparam.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/vermagic.h>
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#include <linux/notifier.h>
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#include <linux/sched.h>
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#include <linux/stop_machine.h>
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#include <linux/device.h>
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#include <linux/string.h>
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#include <linux/mutex.h>
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#include <linux/unwind.h>
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#include <asm/uaccess.h>
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#include <asm/semaphore.h>
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#include <asm/cacheflush.h>
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#include <linux/license.h>
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extern int module_sysfs_initialized;
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt , a...)
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#endif
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#ifndef ARCH_SHF_SMALL
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#define ARCH_SHF_SMALL 0
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#endif
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/* If this is set, the section belongs in the init part of the module */
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#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
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/* Protects module list */
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static DEFINE_SPINLOCK(modlist_lock);
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/* List of modules, protected by module_mutex AND modlist_lock */
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static DEFINE_MUTEX(module_mutex);
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static LIST_HEAD(modules);
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static BLOCKING_NOTIFIER_HEAD(module_notify_list);
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int register_module_notifier(struct notifier_block * nb)
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{
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return blocking_notifier_chain_register(&module_notify_list, nb);
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}
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EXPORT_SYMBOL(register_module_notifier);
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int unregister_module_notifier(struct notifier_block * nb)
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{
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return blocking_notifier_chain_unregister(&module_notify_list, nb);
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}
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EXPORT_SYMBOL(unregister_module_notifier);
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/* We require a truly strong try_module_get() */
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static inline int strong_try_module_get(struct module *mod)
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{
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if (mod && mod->state == MODULE_STATE_COMING)
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return 0;
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return try_module_get(mod);
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}
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static inline void add_taint_module(struct module *mod, unsigned flag)
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{
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add_taint(flag);
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mod->taints |= flag;
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}
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/*
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* A thread that wants to hold a reference to a module only while it
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* is running can call this to safely exit. nfsd and lockd use this.
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*/
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void __module_put_and_exit(struct module *mod, long code)
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{
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module_put(mod);
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do_exit(code);
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}
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EXPORT_SYMBOL(__module_put_and_exit);
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/* Find a module section: 0 means not found. */
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static unsigned int find_sec(Elf_Ehdr *hdr,
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Elf_Shdr *sechdrs,
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const char *secstrings,
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const char *name)
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{
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unsigned int i;
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for (i = 1; i < hdr->e_shnum; i++)
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/* Alloc bit cleared means "ignore it." */
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if ((sechdrs[i].sh_flags & SHF_ALLOC)
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&& strcmp(secstrings+sechdrs[i].sh_name, name) == 0)
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return i;
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return 0;
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}
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/* Provided by the linker */
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extern const struct kernel_symbol __start___ksymtab[];
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extern const struct kernel_symbol __stop___ksymtab[];
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extern const struct kernel_symbol __start___ksymtab_gpl[];
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extern const struct kernel_symbol __stop___ksymtab_gpl[];
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extern const struct kernel_symbol __start___ksymtab_gpl_future[];
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extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
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extern const struct kernel_symbol __start___ksymtab_unused[];
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extern const struct kernel_symbol __stop___ksymtab_unused[];
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extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
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extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
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extern const struct kernel_symbol __start___ksymtab_gpl_future[];
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extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
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extern const unsigned long __start___kcrctab[];
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extern const unsigned long __start___kcrctab_gpl[];
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extern const unsigned long __start___kcrctab_gpl_future[];
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extern const unsigned long __start___kcrctab_unused[];
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extern const unsigned long __start___kcrctab_unused_gpl[];
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#ifndef CONFIG_MODVERSIONS
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#define symversion(base, idx) NULL
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#else
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#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
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#endif
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/* lookup symbol in given range of kernel_symbols */
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static const struct kernel_symbol *lookup_symbol(const char *name,
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const struct kernel_symbol *start,
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const struct kernel_symbol *stop)
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{
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const struct kernel_symbol *ks = start;
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for (; ks < stop; ks++)
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if (strcmp(ks->name, name) == 0)
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return ks;
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return NULL;
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}
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static void printk_unused_warning(const char *name)
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{
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printk(KERN_WARNING "Symbol %s is marked as UNUSED, "
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"however this module is using it.\n", name);
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printk(KERN_WARNING "This symbol will go away in the future.\n");
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printk(KERN_WARNING "Please evalute if this is the right api to use, "
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"and if it really is, submit a report the linux kernel "
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"mailinglist together with submitting your code for "
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"inclusion.\n");
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}
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/* Find a symbol, return value, crc and module which owns it */
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static unsigned long __find_symbol(const char *name,
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struct module **owner,
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const unsigned long **crc,
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int gplok)
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{
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struct module *mod;
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const struct kernel_symbol *ks;
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/* Core kernel first. */
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*owner = NULL;
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ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
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if (ks) {
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*crc = symversion(__start___kcrctab, (ks - __start___ksymtab));
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return ks->value;
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}
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if (gplok) {
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ks = lookup_symbol(name, __start___ksymtab_gpl,
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__stop___ksymtab_gpl);
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if (ks) {
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*crc = symversion(__start___kcrctab_gpl,
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(ks - __start___ksymtab_gpl));
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return ks->value;
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}
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}
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ks = lookup_symbol(name, __start___ksymtab_gpl_future,
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__stop___ksymtab_gpl_future);
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if (ks) {
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if (!gplok) {
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printk(KERN_WARNING "Symbol %s is being used "
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"by a non-GPL module, which will not "
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"be allowed in the future\n", name);
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printk(KERN_WARNING "Please see the file "
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"Documentation/feature-removal-schedule.txt "
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"in the kernel source tree for more "
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"details.\n");
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}
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*crc = symversion(__start___kcrctab_gpl_future,
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(ks - __start___ksymtab_gpl_future));
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return ks->value;
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}
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ks = lookup_symbol(name, __start___ksymtab_unused,
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__stop___ksymtab_unused);
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if (ks) {
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printk_unused_warning(name);
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*crc = symversion(__start___kcrctab_unused,
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(ks - __start___ksymtab_unused));
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return ks->value;
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}
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if (gplok)
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ks = lookup_symbol(name, __start___ksymtab_unused_gpl,
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__stop___ksymtab_unused_gpl);
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if (ks) {
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printk_unused_warning(name);
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*crc = symversion(__start___kcrctab_unused_gpl,
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(ks - __start___ksymtab_unused_gpl));
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return ks->value;
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}
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/* Now try modules. */
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list_for_each_entry(mod, &modules, list) {
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*owner = mod;
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ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
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if (ks) {
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*crc = symversion(mod->crcs, (ks - mod->syms));
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return ks->value;
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}
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if (gplok) {
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ks = lookup_symbol(name, mod->gpl_syms,
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mod->gpl_syms + mod->num_gpl_syms);
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if (ks) {
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*crc = symversion(mod->gpl_crcs,
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(ks - mod->gpl_syms));
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return ks->value;
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}
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}
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ks = lookup_symbol(name, mod->unused_syms, mod->unused_syms + mod->num_unused_syms);
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if (ks) {
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printk_unused_warning(name);
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*crc = symversion(mod->unused_crcs, (ks - mod->unused_syms));
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return ks->value;
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}
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if (gplok) {
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ks = lookup_symbol(name, mod->unused_gpl_syms,
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mod->unused_gpl_syms + mod->num_unused_gpl_syms);
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if (ks) {
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printk_unused_warning(name);
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*crc = symversion(mod->unused_gpl_crcs,
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(ks - mod->unused_gpl_syms));
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return ks->value;
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}
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}
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ks = lookup_symbol(name, mod->gpl_future_syms,
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(mod->gpl_future_syms +
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mod->num_gpl_future_syms));
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if (ks) {
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if (!gplok) {
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printk(KERN_WARNING "Symbol %s is being used "
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"by a non-GPL module, which will not "
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"be allowed in the future\n", name);
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printk(KERN_WARNING "Please see the file "
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"Documentation/feature-removal-schedule.txt "
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"in the kernel source tree for more "
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"details.\n");
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}
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*crc = symversion(mod->gpl_future_crcs,
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(ks - mod->gpl_future_syms));
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return ks->value;
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}
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}
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DEBUGP("Failed to find symbol %s\n", name);
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return 0;
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}
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/* Search for module by name: must hold module_mutex. */
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static struct module *find_module(const char *name)
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{
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struct module *mod;
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list_for_each_entry(mod, &modules, list) {
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if (strcmp(mod->name, name) == 0)
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return mod;
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}
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return NULL;
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}
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#ifdef CONFIG_SMP
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/* Number of blocks used and allocated. */
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static unsigned int pcpu_num_used, pcpu_num_allocated;
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/* Size of each block. -ve means used. */
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static int *pcpu_size;
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static int split_block(unsigned int i, unsigned short size)
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{
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/* Reallocation required? */
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if (pcpu_num_used + 1 > pcpu_num_allocated) {
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int *new;
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new = krealloc(pcpu_size, sizeof(new[0])*pcpu_num_allocated*2,
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GFP_KERNEL);
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if (!new)
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return 0;
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pcpu_num_allocated *= 2;
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pcpu_size = new;
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}
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/* Insert a new subblock */
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memmove(&pcpu_size[i+1], &pcpu_size[i],
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sizeof(pcpu_size[0]) * (pcpu_num_used - i));
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pcpu_num_used++;
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pcpu_size[i+1] -= size;
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pcpu_size[i] = size;
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return 1;
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}
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static inline unsigned int block_size(int val)
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{
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if (val < 0)
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return -val;
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return val;
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}
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/* Created by linker magic */
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extern char __per_cpu_start[], __per_cpu_end[];
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static void *percpu_modalloc(unsigned long size, unsigned long align,
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const char *name)
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{
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unsigned long extra;
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unsigned int i;
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void *ptr;
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if (align > PAGE_SIZE) {
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printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n",
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name, align, PAGE_SIZE);
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align = PAGE_SIZE;
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}
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ptr = __per_cpu_start;
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for (i = 0; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
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/* Extra for alignment requirement. */
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extra = ALIGN((unsigned long)ptr, align) - (unsigned long)ptr;
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BUG_ON(i == 0 && extra != 0);
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if (pcpu_size[i] < 0 || pcpu_size[i] < extra + size)
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continue;
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/* Transfer extra to previous block. */
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if (pcpu_size[i-1] < 0)
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pcpu_size[i-1] -= extra;
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else
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pcpu_size[i-1] += extra;
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pcpu_size[i] -= extra;
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ptr += extra;
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/* Split block if warranted */
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if (pcpu_size[i] - size > sizeof(unsigned long))
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if (!split_block(i, size))
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return NULL;
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/* Mark allocated */
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pcpu_size[i] = -pcpu_size[i];
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return ptr;
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}
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printk(KERN_WARNING "Could not allocate %lu bytes percpu data\n",
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size);
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return NULL;
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}
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static void percpu_modfree(void *freeme)
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{
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unsigned int i;
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void *ptr = __per_cpu_start + block_size(pcpu_size[0]);
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|
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/* First entry is core kernel percpu data. */
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for (i = 1; i < pcpu_num_used; ptr += block_size(pcpu_size[i]), i++) {
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if (ptr == freeme) {
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pcpu_size[i] = -pcpu_size[i];
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goto free;
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}
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}
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BUG();
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free:
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/* Merge with previous? */
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if (pcpu_size[i-1] >= 0) {
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pcpu_size[i-1] += pcpu_size[i];
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pcpu_num_used--;
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memmove(&pcpu_size[i], &pcpu_size[i+1],
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(pcpu_num_used - i) * sizeof(pcpu_size[0]));
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i--;
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}
|
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/* Merge with next? */
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if (i+1 < pcpu_num_used && pcpu_size[i+1] >= 0) {
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pcpu_size[i] += pcpu_size[i+1];
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pcpu_num_used--;
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memmove(&pcpu_size[i+1], &pcpu_size[i+2],
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(pcpu_num_used - (i+1)) * sizeof(pcpu_size[0]));
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}
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}
|
|
|
|
static unsigned int find_pcpusec(Elf_Ehdr *hdr,
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Elf_Shdr *sechdrs,
|
|
const char *secstrings)
|
|
{
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return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
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|
}
|
|
|
|
static int percpu_modinit(void)
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{
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pcpu_num_used = 2;
|
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pcpu_num_allocated = 2;
|
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pcpu_size = kmalloc(sizeof(pcpu_size[0]) * pcpu_num_allocated,
|
|
GFP_KERNEL);
|
|
/* Static in-kernel percpu data (used). */
|
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pcpu_size[0] = -(__per_cpu_end-__per_cpu_start);
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|
/* Free room. */
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pcpu_size[1] = PERCPU_ENOUGH_ROOM + pcpu_size[0];
|
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if (pcpu_size[1] < 0) {
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printk(KERN_ERR "No per-cpu room for modules.\n");
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pcpu_num_used = 1;
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}
|
|
|
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return 0;
|
|
}
|
|
__initcall(percpu_modinit);
|
|
#else /* ... !CONFIG_SMP */
|
|
static inline void *percpu_modalloc(unsigned long size, unsigned long align,
|
|
const char *name)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline void percpu_modfree(void *pcpuptr)
|
|
{
|
|
BUG();
|
|
}
|
|
static inline unsigned int find_pcpusec(Elf_Ehdr *hdr,
|
|
Elf_Shdr *sechdrs,
|
|
const char *secstrings)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void percpu_modcopy(void *pcpudst, const void *src,
|
|
unsigned long size)
|
|
{
|
|
/* pcpusec should be 0, and size of that section should be 0. */
|
|
BUG_ON(size != 0);
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}
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#define MODINFO_ATTR(field) \
|
|
static void setup_modinfo_##field(struct module *mod, const char *s) \
|
|
{ \
|
|
mod->field = kstrdup(s, GFP_KERNEL); \
|
|
} \
|
|
static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
|
|
struct module *mod, char *buffer) \
|
|
{ \
|
|
return sprintf(buffer, "%s\n", mod->field); \
|
|
} \
|
|
static int modinfo_##field##_exists(struct module *mod) \
|
|
{ \
|
|
return mod->field != NULL; \
|
|
} \
|
|
static void free_modinfo_##field(struct module *mod) \
|
|
{ \
|
|
kfree(mod->field); \
|
|
mod->field = NULL; \
|
|
} \
|
|
static struct module_attribute modinfo_##field = { \
|
|
.attr = { .name = __stringify(field), .mode = 0444, \
|
|
.owner = THIS_MODULE }, \
|
|
.show = show_modinfo_##field, \
|
|
.setup = setup_modinfo_##field, \
|
|
.test = modinfo_##field##_exists, \
|
|
.free = free_modinfo_##field, \
|
|
};
|
|
|
|
MODINFO_ATTR(version);
|
|
MODINFO_ATTR(srcversion);
|
|
|
|
#ifdef CONFIG_MODULE_UNLOAD
|
|
/* Init the unload section of the module. */
|
|
static void module_unload_init(struct module *mod)
|
|
{
|
|
unsigned int i;
|
|
|
|
INIT_LIST_HEAD(&mod->modules_which_use_me);
|
|
for (i = 0; i < NR_CPUS; i++)
|
|
local_set(&mod->ref[i].count, 0);
|
|
/* Hold reference count during initialization. */
|
|
local_set(&mod->ref[raw_smp_processor_id()].count, 1);
|
|
/* Backwards compatibility macros put refcount during init. */
|
|
mod->waiter = current;
|
|
}
|
|
|
|
/* modules using other modules */
|
|
struct module_use
|
|
{
|
|
struct list_head list;
|
|
struct module *module_which_uses;
|
|
};
|
|
|
|
/* Does a already use b? */
|
|
static int already_uses(struct module *a, struct module *b)
|
|
{
|
|
struct module_use *use;
|
|
|
|
list_for_each_entry(use, &b->modules_which_use_me, list) {
|
|
if (use->module_which_uses == a) {
|
|
DEBUGP("%s uses %s!\n", a->name, b->name);
|
|
return 1;
|
|
}
|
|
}
|
|
DEBUGP("%s does not use %s!\n", a->name, b->name);
|
|
return 0;
|
|
}
|
|
|
|
/* Module a uses b */
|
|
static int use_module(struct module *a, struct module *b)
|
|
{
|
|
struct module_use *use;
|
|
int no_warn;
|
|
|
|
if (b == NULL || already_uses(a, b)) return 1;
|
|
|
|
if (!strong_try_module_get(b))
|
|
return 0;
|
|
|
|
DEBUGP("Allocating new usage for %s.\n", a->name);
|
|
use = kmalloc(sizeof(*use), GFP_ATOMIC);
|
|
if (!use) {
|
|
printk("%s: out of memory loading\n", a->name);
|
|
module_put(b);
|
|
return 0;
|
|
}
|
|
|
|
use->module_which_uses = a;
|
|
list_add(&use->list, &b->modules_which_use_me);
|
|
no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
|
|
return 1;
|
|
}
|
|
|
|
/* Clear the unload stuff of the module. */
|
|
static void module_unload_free(struct module *mod)
|
|
{
|
|
struct module *i;
|
|
|
|
list_for_each_entry(i, &modules, list) {
|
|
struct module_use *use;
|
|
|
|
list_for_each_entry(use, &i->modules_which_use_me, list) {
|
|
if (use->module_which_uses == mod) {
|
|
DEBUGP("%s unusing %s\n", mod->name, i->name);
|
|
module_put(i);
|
|
list_del(&use->list);
|
|
kfree(use);
|
|
sysfs_remove_link(i->holders_dir, mod->name);
|
|
/* There can be at most one match. */
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_MODULE_FORCE_UNLOAD
|
|
static inline int try_force_unload(unsigned int flags)
|
|
{
|
|
int ret = (flags & O_TRUNC);
|
|
if (ret)
|
|
add_taint(TAINT_FORCED_RMMOD);
|
|
return ret;
|
|
}
|
|
#else
|
|
static inline int try_force_unload(unsigned int flags)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_MODULE_FORCE_UNLOAD */
|
|
|
|
struct stopref
|
|
{
|
|
struct module *mod;
|
|
int flags;
|
|
int *forced;
|
|
};
|
|
|
|
/* Whole machine is stopped with interrupts off when this runs. */
|
|
static int __try_stop_module(void *_sref)
|
|
{
|
|
struct stopref *sref = _sref;
|
|
|
|
/* If it's not unused, quit unless we are told to block. */
|
|
if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
|
|
if (!(*sref->forced = try_force_unload(sref->flags)))
|
|
return -EWOULDBLOCK;
|
|
}
|
|
|
|
/* Mark it as dying. */
|
|
sref->mod->state = MODULE_STATE_GOING;
|
|
return 0;
|
|
}
|
|
|
|
static int try_stop_module(struct module *mod, int flags, int *forced)
|
|
{
|
|
struct stopref sref = { mod, flags, forced };
|
|
|
|
return stop_machine_run(__try_stop_module, &sref, NR_CPUS);
|
|
}
|
|
|
|
unsigned int module_refcount(struct module *mod)
|
|
{
|
|
unsigned int i, total = 0;
|
|
|
|
for (i = 0; i < NR_CPUS; i++)
|
|
total += local_read(&mod->ref[i].count);
|
|
return total;
|
|
}
|
|
EXPORT_SYMBOL(module_refcount);
|
|
|
|
/* This exists whether we can unload or not */
|
|
static void free_module(struct module *mod);
|
|
|
|
static void wait_for_zero_refcount(struct module *mod)
|
|
{
|
|
/* Since we might sleep for some time, drop the semaphore first */
|
|
mutex_unlock(&module_mutex);
|
|
for (;;) {
|
|
DEBUGP("Looking at refcount...\n");
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
if (module_refcount(mod) == 0)
|
|
break;
|
|
schedule();
|
|
}
|
|
current->state = TASK_RUNNING;
|
|
mutex_lock(&module_mutex);
|
|
}
|
|
|
|
asmlinkage long
|
|
sys_delete_module(const char __user *name_user, unsigned int flags)
|
|
{
|
|
struct module *mod;
|
|
char name[MODULE_NAME_LEN];
|
|
int ret, forced = 0;
|
|
|
|
if (!capable(CAP_SYS_MODULE))
|
|
return -EPERM;
|
|
|
|
if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
|
|
return -EFAULT;
|
|
name[MODULE_NAME_LEN-1] = '\0';
|
|
|
|
if (mutex_lock_interruptible(&module_mutex) != 0)
|
|
return -EINTR;
|
|
|
|
mod = find_module(name);
|
|
if (!mod) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
if (!list_empty(&mod->modules_which_use_me)) {
|
|
/* Other modules depend on us: get rid of them first. */
|
|
ret = -EWOULDBLOCK;
|
|
goto out;
|
|
}
|
|
|
|
/* Doing init or already dying? */
|
|
if (mod->state != MODULE_STATE_LIVE) {
|
|
/* FIXME: if (force), slam module count and wake up
|
|
waiter --RR */
|
|
DEBUGP("%s already dying\n", mod->name);
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
/* If it has an init func, it must have an exit func to unload */
|
|
if ((mod->init != NULL && mod->exit == NULL)
|
|
|| mod->unsafe) {
|
|
forced = try_force_unload(flags);
|
|
if (!forced) {
|
|
/* This module can't be removed */
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Set this up before setting mod->state */
|
|
mod->waiter = current;
|
|
|
|
/* Stop the machine so refcounts can't move and disable module. */
|
|
ret = try_stop_module(mod, flags, &forced);
|
|
if (ret != 0)
|
|
goto out;
|
|
|
|
/* Never wait if forced. */
|
|
if (!forced && module_refcount(mod) != 0)
|
|
wait_for_zero_refcount(mod);
|
|
|
|
/* Final destruction now noone is using it. */
|
|
if (mod->exit != NULL) {
|
|
mutex_unlock(&module_mutex);
|
|
mod->exit();
|
|
mutex_lock(&module_mutex);
|
|
}
|
|
free_module(mod);
|
|
|
|
out:
|
|
mutex_unlock(&module_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void print_unload_info(struct seq_file *m, struct module *mod)
|
|
{
|
|
struct module_use *use;
|
|
int printed_something = 0;
|
|
|
|
seq_printf(m, " %u ", 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->modules_which_use_me, list) {
|
|
printed_something = 1;
|
|
seq_printf(m, "%s,", use->module_which_uses->name);
|
|
}
|
|
|
|
if (mod->unsafe) {
|
|
printed_something = 1;
|
|
seq_printf(m, "[unsafe],");
|
|
}
|
|
|
|
if (mod->init != NULL && mod->exit == NULL) {
|
|
printed_something = 1;
|
|
seq_printf(m, "[permanent],");
|
|
}
|
|
|
|
if (!printed_something)
|
|
seq_printf(m, "-");
|
|
}
|
|
|
|
void __symbol_put(const char *symbol)
|
|
{
|
|
struct module *owner;
|
|
unsigned long flags;
|
|
const unsigned long *crc;
|
|
|
|
spin_lock_irqsave(&modlist_lock, flags);
|
|
if (!__find_symbol(symbol, &owner, &crc, 1))
|
|
BUG();
|
|
module_put(owner);
|
|
spin_unlock_irqrestore(&modlist_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(__symbol_put);
|
|
|
|
void symbol_put_addr(void *addr)
|
|
{
|
|
struct module *modaddr;
|
|
|
|
if (core_kernel_text((unsigned long)addr))
|
|
return;
|
|
|
|
if (!(modaddr = module_text_address((unsigned long)addr)))
|
|
BUG();
|
|
module_put(modaddr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(symbol_put_addr);
|
|
|
|
static ssize_t show_refcnt(struct module_attribute *mattr,
|
|
struct module *mod, char *buffer)
|
|
{
|
|
/* sysfs holds a reference */
|
|
return sprintf(buffer, "%u\n", module_refcount(mod)-1);
|
|
}
|
|
|
|
static struct module_attribute refcnt = {
|
|
.attr = { .name = "refcnt", .mode = 0444, .owner = THIS_MODULE },
|
|
.show = show_refcnt,
|
|
};
|
|
|
|
void module_put(struct module *module)
|
|
{
|
|
if (module) {
|
|
unsigned int cpu = get_cpu();
|
|
local_dec(&module->ref[cpu].count);
|
|
/* Maybe they're waiting for us to drop reference? */
|
|
if (unlikely(!module_is_live(module)))
|
|
wake_up_process(module->waiter);
|
|
put_cpu();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(module_put);
|
|
|
|
#else /* !CONFIG_MODULE_UNLOAD */
|
|
static void print_unload_info(struct seq_file *m, struct module *mod)
|
|
{
|
|
/* We don't know the usage count, or what modules are using. */
|
|
seq_printf(m, " - -");
|
|
}
|
|
|
|
static inline void module_unload_free(struct module *mod)
|
|
{
|
|
}
|
|
|
|
static inline int use_module(struct module *a, struct module *b)
|
|
{
|
|
return strong_try_module_get(b);
|
|
}
|
|
|
|
static inline void module_unload_init(struct module *mod)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MODULE_UNLOAD */
|
|
|
|
static ssize_t show_initstate(struct module_attribute *mattr,
|
|
struct module *mod, char *buffer)
|
|
{
|
|
const char *state = "unknown";
|
|
|
|
switch (mod->state) {
|
|
case MODULE_STATE_LIVE:
|
|
state = "live";
|
|
break;
|
|
case MODULE_STATE_COMING:
|
|
state = "coming";
|
|
break;
|
|
case MODULE_STATE_GOING:
|
|
state = "going";
|
|
break;
|
|
}
|
|
return sprintf(buffer, "%s\n", state);
|
|
}
|
|
|
|
static struct module_attribute initstate = {
|
|
.attr = { .name = "initstate", .mode = 0444, .owner = THIS_MODULE },
|
|
.show = show_initstate,
|
|
};
|
|
|
|
static struct module_attribute *modinfo_attrs[] = {
|
|
&modinfo_version,
|
|
&modinfo_srcversion,
|
|
&initstate,
|
|
#ifdef CONFIG_MODULE_UNLOAD
|
|
&refcnt,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static const char vermagic[] = VERMAGIC_STRING;
|
|
|
|
#ifdef CONFIG_MODVERSIONS
|
|
static int check_version(Elf_Shdr *sechdrs,
|
|
unsigned int versindex,
|
|
const char *symname,
|
|
struct module *mod,
|
|
const unsigned long *crc)
|
|
{
|
|
unsigned int i, num_versions;
|
|
struct modversion_info *versions;
|
|
|
|
/* Exporting module didn't supply crcs? OK, we're already tainted. */
|
|
if (!crc)
|
|
return 1;
|
|
|
|
versions = (void *) sechdrs[versindex].sh_addr;
|
|
num_versions = sechdrs[versindex].sh_size
|
|
/ sizeof(struct modversion_info);
|
|
|
|
for (i = 0; i < num_versions; i++) {
|
|
if (strcmp(versions[i].name, symname) != 0)
|
|
continue;
|
|
|
|
if (versions[i].crc == *crc)
|
|
return 1;
|
|
printk("%s: disagrees about version of symbol %s\n",
|
|
mod->name, symname);
|
|
DEBUGP("Found checksum %lX vs module %lX\n",
|
|
*crc, versions[i].crc);
|
|
return 0;
|
|
}
|
|
/* Not in module's version table. OK, but that taints the kernel. */
|
|
if (!(tainted & TAINT_FORCED_MODULE))
|
|
printk("%s: no version for \"%s\" found: kernel tainted.\n",
|
|
mod->name, symname);
|
|
add_taint_module(mod, TAINT_FORCED_MODULE);
|
|
return 1;
|
|
}
|
|
|
|
static inline int check_modstruct_version(Elf_Shdr *sechdrs,
|
|
unsigned int versindex,
|
|
struct module *mod)
|
|
{
|
|
const unsigned long *crc;
|
|
struct module *owner;
|
|
|
|
if (!__find_symbol("struct_module", &owner, &crc, 1))
|
|
BUG();
|
|
return check_version(sechdrs, versindex, "struct_module", mod,
|
|
crc);
|
|
}
|
|
|
|
/* First part is kernel version, which we ignore. */
|
|
static inline int same_magic(const char *amagic, const char *bmagic)
|
|
{
|
|
amagic += strcspn(amagic, " ");
|
|
bmagic += strcspn(bmagic, " ");
|
|
return strcmp(amagic, bmagic) == 0;
|
|
}
|
|
#else
|
|
static inline int check_version(Elf_Shdr *sechdrs,
|
|
unsigned int versindex,
|
|
const char *symname,
|
|
struct module *mod,
|
|
const unsigned long *crc)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int check_modstruct_version(Elf_Shdr *sechdrs,
|
|
unsigned int versindex,
|
|
struct module *mod)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static inline int same_magic(const char *amagic, const char *bmagic)
|
|
{
|
|
return strcmp(amagic, bmagic) == 0;
|
|
}
|
|
#endif /* CONFIG_MODVERSIONS */
|
|
|
|
/* Resolve a symbol for this module. I.e. if we find one, record usage.
|
|
Must be holding module_mutex. */
|
|
static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
|
|
unsigned int versindex,
|
|
const char *name,
|
|
struct module *mod)
|
|
{
|
|
struct module *owner;
|
|
unsigned long ret;
|
|
const unsigned long *crc;
|
|
|
|
ret = __find_symbol(name, &owner, &crc,
|
|
!(mod->taints & TAINT_PROPRIETARY_MODULE));
|
|
if (ret) {
|
|
/* use_module can fail due to OOM, or module unloading */
|
|
if (!check_version(sechdrs, versindex, name, mod, crc) ||
|
|
!use_module(mod, owner))
|
|
ret = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* /sys/module/foo/sections stuff
|
|
* J. Corbet <corbet@lwn.net>
|
|
*/
|
|
#ifdef CONFIG_KALLSYMS
|
|
static ssize_t module_sect_show(struct module_attribute *mattr,
|
|
struct module *mod, char *buf)
|
|
{
|
|
struct module_sect_attr *sattr =
|
|
container_of(mattr, struct module_sect_attr, mattr);
|
|
return sprintf(buf, "0x%lx\n", sattr->address);
|
|
}
|
|
|
|
static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
|
|
{
|
|
int section;
|
|
|
|
for (section = 0; section < sect_attrs->nsections; section++)
|
|
kfree(sect_attrs->attrs[section].name);
|
|
kfree(sect_attrs);
|
|
}
|
|
|
|
static void add_sect_attrs(struct module *mod, unsigned int nsect,
|
|
char *secstrings, Elf_Shdr *sechdrs)
|
|
{
|
|
unsigned int nloaded = 0, i, size[2];
|
|
struct module_sect_attrs *sect_attrs;
|
|
struct module_sect_attr *sattr;
|
|
struct attribute **gattr;
|
|
|
|
/* Count loaded sections and allocate structures */
|
|
for (i = 0; i < nsect; i++)
|
|
if (sechdrs[i].sh_flags & SHF_ALLOC)
|
|
nloaded++;
|
|
size[0] = ALIGN(sizeof(*sect_attrs)
|
|
+ nloaded * sizeof(sect_attrs->attrs[0]),
|
|
sizeof(sect_attrs->grp.attrs[0]));
|
|
size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
|
|
sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
|
|
if (sect_attrs == NULL)
|
|
return;
|
|
|
|
/* Setup section attributes. */
|
|
sect_attrs->grp.name = "sections";
|
|
sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
|
|
|
|
sect_attrs->nsections = 0;
|
|
sattr = §_attrs->attrs[0];
|
|
gattr = §_attrs->grp.attrs[0];
|
|
for (i = 0; i < nsect; i++) {
|
|
if (! (sechdrs[i].sh_flags & SHF_ALLOC))
|
|
continue;
|
|
sattr->address = sechdrs[i].sh_addr;
|
|
sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
|
|
GFP_KERNEL);
|
|
if (sattr->name == NULL)
|
|
goto out;
|
|
sect_attrs->nsections++;
|
|
sattr->mattr.show = module_sect_show;
|
|
sattr->mattr.store = NULL;
|
|
sattr->mattr.attr.name = sattr->name;
|
|
sattr->mattr.attr.owner = mod;
|
|
sattr->mattr.attr.mode = S_IRUGO;
|
|
*(gattr++) = &(sattr++)->mattr.attr;
|
|
}
|
|
*gattr = NULL;
|
|
|
|
if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp))
|
|
goto out;
|
|
|
|
mod->sect_attrs = sect_attrs;
|
|
return;
|
|
out:
|
|
free_sect_attrs(sect_attrs);
|
|
}
|
|
|
|
static void remove_sect_attrs(struct module *mod)
|
|
{
|
|
if (mod->sect_attrs) {
|
|
sysfs_remove_group(&mod->mkobj.kobj,
|
|
&mod->sect_attrs->grp);
|
|
/* We are positive that no one is using any sect attrs
|
|
* at this point. Deallocate immediately. */
|
|
free_sect_attrs(mod->sect_attrs);
|
|
mod->sect_attrs = NULL;
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
|
|
char *sectstrings, Elf_Shdr *sechdrs)
|
|
{
|
|
}
|
|
|
|
static inline void remove_sect_attrs(struct module *mod)
|
|
{
|
|
}
|
|
#endif /* CONFIG_KALLSYMS */
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
int module_add_modinfo_attrs(struct module *mod)
|
|
{
|
|
struct module_attribute *attr;
|
|
struct module_attribute *temp_attr;
|
|
int error = 0;
|
|
int i;
|
|
|
|
mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
|
|
(ARRAY_SIZE(modinfo_attrs) + 1)),
|
|
GFP_KERNEL);
|
|
if (!mod->modinfo_attrs)
|
|
return -ENOMEM;
|
|
|
|
temp_attr = mod->modinfo_attrs;
|
|
for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
|
|
if (!attr->test ||
|
|
(attr->test && attr->test(mod))) {
|
|
memcpy(temp_attr, attr, sizeof(*temp_attr));
|
|
temp_attr->attr.owner = mod;
|
|
error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr);
|
|
++temp_attr;
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
void module_remove_modinfo_attrs(struct module *mod)
|
|
{
|
|
struct module_attribute *attr;
|
|
int i;
|
|
|
|
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
|
|
/* pick a field to test for end of list */
|
|
if (!attr->attr.name)
|
|
break;
|
|
sysfs_remove_file(&mod->mkobj.kobj,&attr->attr);
|
|
if (attr->free)
|
|
attr->free(mod);
|
|
}
|
|
kfree(mod->modinfo_attrs);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
int mod_sysfs_init(struct module *mod)
|
|
{
|
|
int err;
|
|
|
|
if (!module_sysfs_initialized) {
|
|
printk(KERN_ERR "%s: module sysfs not initialized\n",
|
|
mod->name);
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
|
|
err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name);
|
|
if (err)
|
|
goto out;
|
|
kobj_set_kset_s(&mod->mkobj, module_subsys);
|
|
mod->mkobj.mod = mod;
|
|
|
|
kobject_init(&mod->mkobj.kobj);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int mod_sysfs_setup(struct module *mod,
|
|
struct kernel_param *kparam,
|
|
unsigned int num_params)
|
|
{
|
|
int err;
|
|
|
|
/* delay uevent until full sysfs population */
|
|
err = kobject_add(&mod->mkobj.kobj);
|
|
if (err)
|
|
goto out;
|
|
|
|
mod->holders_dir = kobject_add_dir(&mod->mkobj.kobj, "holders");
|
|
if (!mod->holders_dir) {
|
|
err = -ENOMEM;
|
|
goto out_unreg;
|
|
}
|
|
|
|
err = module_param_sysfs_setup(mod, kparam, num_params);
|
|
if (err)
|
|
goto out_unreg_holders;
|
|
|
|
err = module_add_modinfo_attrs(mod);
|
|
if (err)
|
|
goto out_unreg_param;
|
|
|
|
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
|
|
return 0;
|
|
|
|
out_unreg_param:
|
|
module_param_sysfs_remove(mod);
|
|
out_unreg_holders:
|
|
kobject_unregister(mod->holders_dir);
|
|
out_unreg:
|
|
kobject_del(&mod->mkobj.kobj);
|
|
kobject_put(&mod->mkobj.kobj);
|
|
out:
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
static void mod_kobject_remove(struct module *mod)
|
|
{
|
|
module_remove_modinfo_attrs(mod);
|
|
module_param_sysfs_remove(mod);
|
|
kobject_unregister(mod->mkobj.drivers_dir);
|
|
kobject_unregister(mod->holders_dir);
|
|
kobject_unregister(&mod->mkobj.kobj);
|
|
}
|
|
|
|
/*
|
|
* unlink the module with the whole machine is stopped with interrupts off
|
|
* - this defends against kallsyms not taking locks
|
|
*/
|
|
static int __unlink_module(void *_mod)
|
|
{
|
|
struct module *mod = _mod;
|
|
list_del(&mod->list);
|
|
return 0;
|
|
}
|
|
|
|
/* Free a module, remove from lists, etc (must hold module_mutex). */
|
|
static void free_module(struct module *mod)
|
|
{
|
|
/* Delete from various lists */
|
|
stop_machine_run(__unlink_module, mod, NR_CPUS);
|
|
remove_sect_attrs(mod);
|
|
mod_kobject_remove(mod);
|
|
|
|
unwind_remove_table(mod->unwind_info, 0);
|
|
|
|
/* Arch-specific cleanup. */
|
|
module_arch_cleanup(mod);
|
|
|
|
/* Module unload stuff */
|
|
module_unload_free(mod);
|
|
|
|
/* This may be NULL, but that's OK */
|
|
module_free(mod, mod->module_init);
|
|
kfree(mod->args);
|
|
if (mod->percpu)
|
|
percpu_modfree(mod->percpu);
|
|
|
|
/* Free lock-classes: */
|
|
lockdep_free_key_range(mod->module_core, mod->core_size);
|
|
|
|
/* Finally, free the core (containing the module structure) */
|
|
module_free(mod, mod->module_core);
|
|
}
|
|
|
|
void *__symbol_get(const char *symbol)
|
|
{
|
|
struct module *owner;
|
|
unsigned long value, flags;
|
|
const unsigned long *crc;
|
|
|
|
spin_lock_irqsave(&modlist_lock, flags);
|
|
value = __find_symbol(symbol, &owner, &crc, 1);
|
|
if (value && !strong_try_module_get(owner))
|
|
value = 0;
|
|
spin_unlock_irqrestore(&modlist_lock, flags);
|
|
|
|
return (void *)value;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__symbol_get);
|
|
|
|
/*
|
|
* Ensure that an exported symbol [global namespace] does not already exist
|
|
* in the kernel or in some other module's exported symbol table.
|
|
*/
|
|
static int verify_export_symbols(struct module *mod)
|
|
{
|
|
const char *name = NULL;
|
|
unsigned long i, ret = 0;
|
|
struct module *owner;
|
|
const unsigned long *crc;
|
|
|
|
for (i = 0; i < mod->num_syms; i++)
|
|
if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
|
|
name = mod->syms[i].name;
|
|
ret = -ENOEXEC;
|
|
goto dup;
|
|
}
|
|
|
|
for (i = 0; i < mod->num_gpl_syms; i++)
|
|
if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
|
|
name = mod->gpl_syms[i].name;
|
|
ret = -ENOEXEC;
|
|
goto dup;
|
|
}
|
|
|
|
dup:
|
|
if (ret)
|
|
printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
|
|
mod->name, name, module_name(owner));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Change all symbols so that sh_value encodes the pointer directly. */
|
|
static int simplify_symbols(Elf_Shdr *sechdrs,
|
|
unsigned int symindex,
|
|
const char *strtab,
|
|
unsigned int versindex,
|
|
unsigned int pcpuindex,
|
|
struct module *mod)
|
|
{
|
|
Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr;
|
|
unsigned long secbase;
|
|
unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
|
|
int ret = 0;
|
|
|
|
for (i = 1; i < n; i++) {
|
|
switch (sym[i].st_shndx) {
|
|
case SHN_COMMON:
|
|
/* We compiled with -fno-common. These are not
|
|
supposed to happen. */
|
|
DEBUGP("Common symbol: %s\n", strtab + sym[i].st_name);
|
|
printk("%s: please compile with -fno-common\n",
|
|
mod->name);
|
|
ret = -ENOEXEC;
|
|
break;
|
|
|
|
case SHN_ABS:
|
|
/* Don't need to do anything */
|
|
DEBUGP("Absolute symbol: 0x%08lx\n",
|
|
(long)sym[i].st_value);
|
|
break;
|
|
|
|
case SHN_UNDEF:
|
|
sym[i].st_value
|
|
= resolve_symbol(sechdrs, versindex,
|
|
strtab + sym[i].st_name, mod);
|
|
|
|
/* Ok if resolved. */
|
|
if (sym[i].st_value != 0)
|
|
break;
|
|
/* Ok if weak. */
|
|
if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
|
|
break;
|
|
|
|
printk(KERN_WARNING "%s: Unknown symbol %s\n",
|
|
mod->name, strtab + sym[i].st_name);
|
|
ret = -ENOENT;
|
|
break;
|
|
|
|
default:
|
|
/* Divert to percpu allocation if a percpu var. */
|
|
if (sym[i].st_shndx == pcpuindex)
|
|
secbase = (unsigned long)mod->percpu;
|
|
else
|
|
secbase = sechdrs[sym[i].st_shndx].sh_addr;
|
|
sym[i].st_value += secbase;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Update size with this section: return offset. */
|
|
static long get_offset(unsigned long *size, Elf_Shdr *sechdr)
|
|
{
|
|
long ret;
|
|
|
|
ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
|
|
*size = ret + sechdr->sh_size;
|
|
return ret;
|
|
}
|
|
|
|
/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
|
|
might -- code, read-only data, read-write data, small data. Tally
|
|
sizes, and place the offsets into sh_entsize fields: high bit means it
|
|
belongs in init. */
|
|
static void layout_sections(struct module *mod,
|
|
const Elf_Ehdr *hdr,
|
|
Elf_Shdr *sechdrs,
|
|
const char *secstrings)
|
|
{
|
|
static unsigned long const masks[][2] = {
|
|
/* NOTE: all executable code must be the first section
|
|
* in this array; otherwise modify the text_size
|
|
* finder in the two loops below */
|
|
{ SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
|
|
{ SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
|
|
{ SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
|
|
{ ARCH_SHF_SMALL | SHF_ALLOC, 0 }
|
|
};
|
|
unsigned int m, i;
|
|
|
|
for (i = 0; i < hdr->e_shnum; i++)
|
|
sechdrs[i].sh_entsize = ~0UL;
|
|
|
|
DEBUGP("Core section allocation order:\n");
|
|
for (m = 0; m < ARRAY_SIZE(masks); ++m) {
|
|
for (i = 0; i < hdr->e_shnum; ++i) {
|
|
Elf_Shdr *s = &sechdrs[i];
|
|
|
|
if ((s->sh_flags & masks[m][0]) != masks[m][0]
|
|
|| (s->sh_flags & masks[m][1])
|
|
|| s->sh_entsize != ~0UL
|
|
|| strncmp(secstrings + s->sh_name,
|
|
".init", 5) == 0)
|
|
continue;
|
|
s->sh_entsize = get_offset(&mod->core_size, s);
|
|
DEBUGP("\t%s\n", secstrings + s->sh_name);
|
|
}
|
|
if (m == 0)
|
|
mod->core_text_size = mod->core_size;
|
|
}
|
|
|
|
DEBUGP("Init section allocation order:\n");
|
|
for (m = 0; m < ARRAY_SIZE(masks); ++m) {
|
|
for (i = 0; i < hdr->e_shnum; ++i) {
|
|
Elf_Shdr *s = &sechdrs[i];
|
|
|
|
if ((s->sh_flags & masks[m][0]) != masks[m][0]
|
|
|| (s->sh_flags & masks[m][1])
|
|
|| s->sh_entsize != ~0UL
|
|
|| strncmp(secstrings + s->sh_name,
|
|
".init", 5) != 0)
|
|
continue;
|
|
s->sh_entsize = (get_offset(&mod->init_size, s)
|
|
| INIT_OFFSET_MASK);
|
|
DEBUGP("\t%s\n", secstrings + s->sh_name);
|
|
}
|
|
if (m == 0)
|
|
mod->init_text_size = mod->init_size;
|
|
}
|
|
}
|
|
|
|
static void set_license(struct module *mod, const char *license)
|
|
{
|
|
if (!license)
|
|
license = "unspecified";
|
|
|
|
if (!license_is_gpl_compatible(license)) {
|
|
if (!(tainted & TAINT_PROPRIETARY_MODULE))
|
|
printk(KERN_WARNING "%s: module license '%s' taints "
|
|
"kernel.\n", mod->name, license);
|
|
add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
|
|
}
|
|
}
|
|
|
|
/* Parse tag=value strings from .modinfo section */
|
|
static char *next_string(char *string, unsigned long *secsize)
|
|
{
|
|
/* Skip non-zero chars */
|
|
while (string[0]) {
|
|
string++;
|
|
if ((*secsize)-- <= 1)
|
|
return NULL;
|
|
}
|
|
|
|
/* Skip any zero padding. */
|
|
while (!string[0]) {
|
|
string++;
|
|
if ((*secsize)-- <= 1)
|
|
return NULL;
|
|
}
|
|
return string;
|
|
}
|
|
|
|
static char *get_modinfo(Elf_Shdr *sechdrs,
|
|
unsigned int info,
|
|
const char *tag)
|
|
{
|
|
char *p;
|
|
unsigned int taglen = strlen(tag);
|
|
unsigned long size = sechdrs[info].sh_size;
|
|
|
|
for (p = (char *)sechdrs[info].sh_addr; p; p = next_string(p, &size)) {
|
|
if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
|
|
return p + taglen + 1;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void setup_modinfo(struct module *mod, Elf_Shdr *sechdrs,
|
|
unsigned int infoindex)
|
|
{
|
|
struct module_attribute *attr;
|
|
int i;
|
|
|
|
for (i = 0; (attr = modinfo_attrs[i]); i++) {
|
|
if (attr->setup)
|
|
attr->setup(mod,
|
|
get_modinfo(sechdrs,
|
|
infoindex,
|
|
attr->attr.name));
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_KALLSYMS
|
|
static int is_exported(const char *name, const struct module *mod)
|
|
{
|
|
if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
|
|
return 1;
|
|
else
|
|
if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* As per nm */
|
|
static char elf_type(const Elf_Sym *sym,
|
|
Elf_Shdr *sechdrs,
|
|
const char *secstrings,
|
|
struct module *mod)
|
|
{
|
|
if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
|
|
if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
|
|
return 'v';
|
|
else
|
|
return 'w';
|
|
}
|
|
if (sym->st_shndx == SHN_UNDEF)
|
|
return 'U';
|
|
if (sym->st_shndx == SHN_ABS)
|
|
return 'a';
|
|
if (sym->st_shndx >= SHN_LORESERVE)
|
|
return '?';
|
|
if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
|
|
return 't';
|
|
if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
|
|
&& sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
|
|
if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
|
|
return 'r';
|
|
else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
|
|
return 'g';
|
|
else
|
|
return 'd';
|
|
}
|
|
if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
|
|
if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
|
|
return 's';
|
|
else
|
|
return 'b';
|
|
}
|
|
if (strncmp(secstrings + sechdrs[sym->st_shndx].sh_name,
|
|
".debug", strlen(".debug")) == 0)
|
|
return 'n';
|
|
return '?';
|
|
}
|
|
|
|
static void add_kallsyms(struct module *mod,
|
|
Elf_Shdr *sechdrs,
|
|
unsigned int symindex,
|
|
unsigned int strindex,
|
|
const char *secstrings)
|
|
{
|
|
unsigned int i;
|
|
|
|
mod->symtab = (void *)sechdrs[symindex].sh_addr;
|
|
mod->num_symtab = sechdrs[symindex].sh_size / sizeof(Elf_Sym);
|
|
mod->strtab = (void *)sechdrs[strindex].sh_addr;
|
|
|
|
/* Set types up while we still have access to sections. */
|
|
for (i = 0; i < mod->num_symtab; i++)
|
|
mod->symtab[i].st_info
|
|
= elf_type(&mod->symtab[i], sechdrs, secstrings, mod);
|
|
}
|
|
#else
|
|
static inline void add_kallsyms(struct module *mod,
|
|
Elf_Shdr *sechdrs,
|
|
unsigned int symindex,
|
|
unsigned int strindex,
|
|
const char *secstrings)
|
|
{
|
|
}
|
|
#endif /* CONFIG_KALLSYMS */
|
|
|
|
/* Allocate and load the module: note that size of section 0 is always
|
|
zero, and we rely on this for optional sections. */
|
|
static struct module *load_module(void __user *umod,
|
|
unsigned long len,
|
|
const char __user *uargs)
|
|
{
|
|
Elf_Ehdr *hdr;
|
|
Elf_Shdr *sechdrs;
|
|
char *secstrings, *args, *modmagic, *strtab = NULL;
|
|
unsigned int i;
|
|
unsigned int symindex = 0;
|
|
unsigned int strindex = 0;
|
|
unsigned int setupindex;
|
|
unsigned int exindex;
|
|
unsigned int exportindex;
|
|
unsigned int modindex;
|
|
unsigned int obsparmindex;
|
|
unsigned int infoindex;
|
|
unsigned int gplindex;
|
|
unsigned int crcindex;
|
|
unsigned int gplcrcindex;
|
|
unsigned int versindex;
|
|
unsigned int pcpuindex;
|
|
unsigned int gplfutureindex;
|
|
unsigned int gplfuturecrcindex;
|
|
unsigned int unwindex = 0;
|
|
unsigned int unusedindex;
|
|
unsigned int unusedcrcindex;
|
|
unsigned int unusedgplindex;
|
|
unsigned int unusedgplcrcindex;
|
|
struct module *mod;
|
|
long err = 0;
|
|
void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
|
|
struct exception_table_entry *extable;
|
|
mm_segment_t old_fs;
|
|
|
|
DEBUGP("load_module: umod=%p, len=%lu, uargs=%p\n",
|
|
umod, len, uargs);
|
|
if (len < sizeof(*hdr))
|
|
return ERR_PTR(-ENOEXEC);
|
|
|
|
/* Suck in entire file: we'll want most of it. */
|
|
/* vmalloc barfs on "unusual" numbers. Check here */
|
|
if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (copy_from_user(hdr, umod, len) != 0) {
|
|
err = -EFAULT;
|
|
goto free_hdr;
|
|
}
|
|
|
|
/* Sanity checks against insmoding binaries or wrong arch,
|
|
weird elf version */
|
|
if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
|
|
|| hdr->e_type != ET_REL
|
|
|| !elf_check_arch(hdr)
|
|
|| hdr->e_shentsize != sizeof(*sechdrs)) {
|
|
err = -ENOEXEC;
|
|
goto free_hdr;
|
|
}
|
|
|
|
if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr))
|
|
goto truncated;
|
|
|
|
/* Convenience variables */
|
|
sechdrs = (void *)hdr + hdr->e_shoff;
|
|
secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
|
|
sechdrs[0].sh_addr = 0;
|
|
|
|
for (i = 1; i < hdr->e_shnum; i++) {
|
|
if (sechdrs[i].sh_type != SHT_NOBITS
|
|
&& len < sechdrs[i].sh_offset + sechdrs[i].sh_size)
|
|
goto truncated;
|
|
|
|
/* Mark all sections sh_addr with their address in the
|
|
temporary image. */
|
|
sechdrs[i].sh_addr = (size_t)hdr + sechdrs[i].sh_offset;
|
|
|
|
/* Internal symbols and strings. */
|
|
if (sechdrs[i].sh_type == SHT_SYMTAB) {
|
|
symindex = i;
|
|
strindex = sechdrs[i].sh_link;
|
|
strtab = (char *)hdr + sechdrs[strindex].sh_offset;
|
|
}
|
|
#ifndef CONFIG_MODULE_UNLOAD
|
|
/* Don't load .exit sections */
|
|
if (strncmp(secstrings+sechdrs[i].sh_name, ".exit", 5) == 0)
|
|
sechdrs[i].sh_flags &= ~(unsigned long)SHF_ALLOC;
|
|
#endif
|
|
}
|
|
|
|
modindex = find_sec(hdr, sechdrs, secstrings,
|
|
".gnu.linkonce.this_module");
|
|
if (!modindex) {
|
|
printk(KERN_WARNING "No module found in object\n");
|
|
err = -ENOEXEC;
|
|
goto free_hdr;
|
|
}
|
|
mod = (void *)sechdrs[modindex].sh_addr;
|
|
|
|
if (symindex == 0) {
|
|
printk(KERN_WARNING "%s: module has no symbols (stripped?)\n",
|
|
mod->name);
|
|
err = -ENOEXEC;
|
|
goto free_hdr;
|
|
}
|
|
|
|
/* Optional sections */
|
|
exportindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab");
|
|
gplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl");
|
|
gplfutureindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_gpl_future");
|
|
unusedindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused");
|
|
unusedgplindex = find_sec(hdr, sechdrs, secstrings, "__ksymtab_unused_gpl");
|
|
crcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab");
|
|
gplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl");
|
|
gplfuturecrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_gpl_future");
|
|
unusedcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused");
|
|
unusedgplcrcindex = find_sec(hdr, sechdrs, secstrings, "__kcrctab_unused_gpl");
|
|
setupindex = find_sec(hdr, sechdrs, secstrings, "__param");
|
|
exindex = find_sec(hdr, sechdrs, secstrings, "__ex_table");
|
|
obsparmindex = find_sec(hdr, sechdrs, secstrings, "__obsparm");
|
|
versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
|
|
infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
|
|
pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
|
|
#ifdef ARCH_UNWIND_SECTION_NAME
|
|
unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
|
|
#endif
|
|
|
|
/* Don't keep modinfo section */
|
|
sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
|
|
#ifdef CONFIG_KALLSYMS
|
|
/* Keep symbol and string tables for decoding later. */
|
|
sechdrs[symindex].sh_flags |= SHF_ALLOC;
|
|
sechdrs[strindex].sh_flags |= SHF_ALLOC;
|
|
#endif
|
|
if (unwindex)
|
|
sechdrs[unwindex].sh_flags |= SHF_ALLOC;
|
|
|
|
/* Check module struct version now, before we try to use module. */
|
|
if (!check_modstruct_version(sechdrs, versindex, mod)) {
|
|
err = -ENOEXEC;
|
|
goto free_hdr;
|
|
}
|
|
|
|
modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
|
|
/* This is allowed: modprobe --force will invalidate it. */
|
|
if (!modmagic) {
|
|
add_taint_module(mod, TAINT_FORCED_MODULE);
|
|
printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
|
|
mod->name);
|
|
} else if (!same_magic(modmagic, vermagic)) {
|
|
printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
|
|
mod->name, modmagic, vermagic);
|
|
err = -ENOEXEC;
|
|
goto free_hdr;
|
|
}
|
|
|
|
/* Now copy in args */
|
|
args = strndup_user(uargs, ~0UL >> 1);
|
|
if (IS_ERR(args)) {
|
|
err = PTR_ERR(args);
|
|
goto free_hdr;
|
|
}
|
|
|
|
if (find_module(mod->name)) {
|
|
err = -EEXIST;
|
|
goto free_mod;
|
|
}
|
|
|
|
mod->state = MODULE_STATE_COMING;
|
|
|
|
/* Allow arches to frob section contents and sizes. */
|
|
err = module_frob_arch_sections(hdr, sechdrs, secstrings, mod);
|
|
if (err < 0)
|
|
goto free_mod;
|
|
|
|
if (pcpuindex) {
|
|
/* We have a special allocation for this section. */
|
|
percpu = percpu_modalloc(sechdrs[pcpuindex].sh_size,
|
|
sechdrs[pcpuindex].sh_addralign,
|
|
mod->name);
|
|
if (!percpu) {
|
|
err = -ENOMEM;
|
|
goto free_mod;
|
|
}
|
|
sechdrs[pcpuindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
|
|
mod->percpu = percpu;
|
|
}
|
|
|
|
/* Determine total sizes, and put offsets in sh_entsize. For now
|
|
this is done generically; there doesn't appear to be any
|
|
special cases for the architectures. */
|
|
layout_sections(mod, hdr, sechdrs, secstrings);
|
|
|
|
/* Do the allocs. */
|
|
ptr = module_alloc(mod->core_size);
|
|
if (!ptr) {
|
|
err = -ENOMEM;
|
|
goto free_percpu;
|
|
}
|
|
memset(ptr, 0, mod->core_size);
|
|
mod->module_core = ptr;
|
|
|
|
ptr = module_alloc(mod->init_size);
|
|
if (!ptr && mod->init_size) {
|
|
err = -ENOMEM;
|
|
goto free_core;
|
|
}
|
|
memset(ptr, 0, mod->init_size);
|
|
mod->module_init = ptr;
|
|
|
|
/* Transfer each section which specifies SHF_ALLOC */
|
|
DEBUGP("final section addresses:\n");
|
|
for (i = 0; i < hdr->e_shnum; i++) {
|
|
void *dest;
|
|
|
|
if (!(sechdrs[i].sh_flags & SHF_ALLOC))
|
|
continue;
|
|
|
|
if (sechdrs[i].sh_entsize & INIT_OFFSET_MASK)
|
|
dest = mod->module_init
|
|
+ (sechdrs[i].sh_entsize & ~INIT_OFFSET_MASK);
|
|
else
|
|
dest = mod->module_core + sechdrs[i].sh_entsize;
|
|
|
|
if (sechdrs[i].sh_type != SHT_NOBITS)
|
|
memcpy(dest, (void *)sechdrs[i].sh_addr,
|
|
sechdrs[i].sh_size);
|
|
/* Update sh_addr to point to copy in image. */
|
|
sechdrs[i].sh_addr = (unsigned long)dest;
|
|
DEBUGP("\t0x%lx %s\n", sechdrs[i].sh_addr, secstrings + sechdrs[i].sh_name);
|
|
}
|
|
/* Module has been moved. */
|
|
mod = (void *)sechdrs[modindex].sh_addr;
|
|
|
|
/* Now we've moved module, initialize linked lists, etc. */
|
|
module_unload_init(mod);
|
|
|
|
/* Initialize kobject, so we can reference it. */
|
|
if (mod_sysfs_init(mod) != 0)
|
|
goto cleanup;
|
|
|
|
/* Set up license info based on the info section */
|
|
set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
|
|
|
|
if (strcmp(mod->name, "ndiswrapper") == 0)
|
|
add_taint(TAINT_PROPRIETARY_MODULE);
|
|
if (strcmp(mod->name, "driverloader") == 0)
|
|
add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
|
|
|
|
/* Set up MODINFO_ATTR fields */
|
|
setup_modinfo(mod, sechdrs, infoindex);
|
|
|
|
/* Fix up syms, so that st_value is a pointer to location. */
|
|
err = simplify_symbols(sechdrs, symindex, strtab, versindex, pcpuindex,
|
|
mod);
|
|
if (err < 0)
|
|
goto cleanup;
|
|
|
|
/* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */
|
|
mod->num_syms = sechdrs[exportindex].sh_size / sizeof(*mod->syms);
|
|
mod->syms = (void *)sechdrs[exportindex].sh_addr;
|
|
if (crcindex)
|
|
mod->crcs = (void *)sechdrs[crcindex].sh_addr;
|
|
mod->num_gpl_syms = sechdrs[gplindex].sh_size / sizeof(*mod->gpl_syms);
|
|
mod->gpl_syms = (void *)sechdrs[gplindex].sh_addr;
|
|
if (gplcrcindex)
|
|
mod->gpl_crcs = (void *)sechdrs[gplcrcindex].sh_addr;
|
|
mod->num_gpl_future_syms = sechdrs[gplfutureindex].sh_size /
|
|
sizeof(*mod->gpl_future_syms);
|
|
mod->num_unused_syms = sechdrs[unusedindex].sh_size /
|
|
sizeof(*mod->unused_syms);
|
|
mod->num_unused_gpl_syms = sechdrs[unusedgplindex].sh_size /
|
|
sizeof(*mod->unused_gpl_syms);
|
|
mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
|
|
if (gplfuturecrcindex)
|
|
mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
|
|
|
|
mod->unused_syms = (void *)sechdrs[unusedindex].sh_addr;
|
|
if (unusedcrcindex)
|
|
mod->unused_crcs = (void *)sechdrs[unusedcrcindex].sh_addr;
|
|
mod->unused_gpl_syms = (void *)sechdrs[unusedgplindex].sh_addr;
|
|
if (unusedgplcrcindex)
|
|
mod->unused_crcs = (void *)sechdrs[unusedgplcrcindex].sh_addr;
|
|
|
|
#ifdef CONFIG_MODVERSIONS
|
|
if ((mod->num_syms && !crcindex) ||
|
|
(mod->num_gpl_syms && !gplcrcindex) ||
|
|
(mod->num_gpl_future_syms && !gplfuturecrcindex) ||
|
|
(mod->num_unused_syms && !unusedcrcindex) ||
|
|
(mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
|
|
printk(KERN_WARNING "%s: No versions for exported symbols."
|
|
" Tainting kernel.\n", mod->name);
|
|
add_taint_module(mod, TAINT_FORCED_MODULE);
|
|
}
|
|
#endif
|
|
|
|
/* Now do relocations. */
|
|
for (i = 1; i < hdr->e_shnum; i++) {
|
|
const char *strtab = (char *)sechdrs[strindex].sh_addr;
|
|
unsigned int info = sechdrs[i].sh_info;
|
|
|
|
/* Not a valid relocation section? */
|
|
if (info >= hdr->e_shnum)
|
|
continue;
|
|
|
|
/* Don't bother with non-allocated sections */
|
|
if (!(sechdrs[info].sh_flags & SHF_ALLOC))
|
|
continue;
|
|
|
|
if (sechdrs[i].sh_type == SHT_REL)
|
|
err = apply_relocate(sechdrs, strtab, symindex, i,mod);
|
|
else if (sechdrs[i].sh_type == SHT_RELA)
|
|
err = apply_relocate_add(sechdrs, strtab, symindex, i,
|
|
mod);
|
|
if (err < 0)
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Find duplicate symbols */
|
|
err = verify_export_symbols(mod);
|
|
|
|
if (err < 0)
|
|
goto cleanup;
|
|
|
|
/* Set up and sort exception table */
|
|
mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
|
|
mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
|
|
sort_extable(extable, extable + mod->num_exentries);
|
|
|
|
/* Finally, copy percpu area over. */
|
|
percpu_modcopy(mod->percpu, (void *)sechdrs[pcpuindex].sh_addr,
|
|
sechdrs[pcpuindex].sh_size);
|
|
|
|
add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
|
|
|
|
err = module_finalize(hdr, sechdrs, mod);
|
|
if (err < 0)
|
|
goto cleanup;
|
|
|
|
/* flush the icache in correct context */
|
|
old_fs = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
|
|
/*
|
|
* Flush the instruction cache, since we've played with text.
|
|
* Do it before processing of module parameters, so the module
|
|
* can provide parameter accessor functions of its own.
|
|
*/
|
|
if (mod->module_init)
|
|
flush_icache_range((unsigned long)mod->module_init,
|
|
(unsigned long)mod->module_init
|
|
+ mod->init_size);
|
|
flush_icache_range((unsigned long)mod->module_core,
|
|
(unsigned long)mod->module_core + mod->core_size);
|
|
|
|
set_fs(old_fs);
|
|
|
|
mod->args = args;
|
|
if (obsparmindex)
|
|
printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
|
|
mod->name);
|
|
|
|
/* Size of section 0 is 0, so this works well if no params */
|
|
err = parse_args(mod->name, mod->args,
|
|
(struct kernel_param *)
|
|
sechdrs[setupindex].sh_addr,
|
|
sechdrs[setupindex].sh_size
|
|
/ sizeof(struct kernel_param),
|
|
NULL);
|
|
if (err < 0)
|
|
goto arch_cleanup;
|
|
|
|
err = mod_sysfs_setup(mod,
|
|
(struct kernel_param *)
|
|
sechdrs[setupindex].sh_addr,
|
|
sechdrs[setupindex].sh_size
|
|
/ sizeof(struct kernel_param));
|
|
if (err < 0)
|
|
goto arch_cleanup;
|
|
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
|
|
|
|
/* Size of section 0 is 0, so this works well if no unwind info. */
|
|
mod->unwind_info = unwind_add_table(mod,
|
|
(void *)sechdrs[unwindex].sh_addr,
|
|
sechdrs[unwindex].sh_size);
|
|
|
|
/* Get rid of temporary copy */
|
|
vfree(hdr);
|
|
|
|
/* Done! */
|
|
return mod;
|
|
|
|
arch_cleanup:
|
|
module_arch_cleanup(mod);
|
|
cleanup:
|
|
module_unload_free(mod);
|
|
module_free(mod, mod->module_init);
|
|
free_core:
|
|
module_free(mod, mod->module_core);
|
|
free_percpu:
|
|
if (percpu)
|
|
percpu_modfree(percpu);
|
|
free_mod:
|
|
kfree(args);
|
|
free_hdr:
|
|
vfree(hdr);
|
|
return ERR_PTR(err);
|
|
|
|
truncated:
|
|
printk(KERN_ERR "Module len %lu truncated\n", len);
|
|
err = -ENOEXEC;
|
|
goto free_hdr;
|
|
}
|
|
|
|
/*
|
|
* link the module with the whole machine is stopped with interrupts off
|
|
* - this defends against kallsyms not taking locks
|
|
*/
|
|
static int __link_module(void *_mod)
|
|
{
|
|
struct module *mod = _mod;
|
|
list_add(&mod->list, &modules);
|
|
return 0;
|
|
}
|
|
|
|
/* This is where the real work happens */
|
|
asmlinkage long
|
|
sys_init_module(void __user *umod,
|
|
unsigned long len,
|
|
const char __user *uargs)
|
|
{
|
|
struct module *mod;
|
|
int ret = 0;
|
|
|
|
/* Must have permission */
|
|
if (!capable(CAP_SYS_MODULE))
|
|
return -EPERM;
|
|
|
|
/* Only one module load at a time, please */
|
|
if (mutex_lock_interruptible(&module_mutex) != 0)
|
|
return -EINTR;
|
|
|
|
/* Do all the hard work */
|
|
mod = load_module(umod, len, uargs);
|
|
if (IS_ERR(mod)) {
|
|
mutex_unlock(&module_mutex);
|
|
return PTR_ERR(mod);
|
|
}
|
|
|
|
/* Now sew it into the lists. They won't access us, since
|
|
strong_try_module_get() will fail. */
|
|
stop_machine_run(__link_module, mod, NR_CPUS);
|
|
|
|
/* Drop lock so they can recurse */
|
|
mutex_unlock(&module_mutex);
|
|
|
|
blocking_notifier_call_chain(&module_notify_list,
|
|
MODULE_STATE_COMING, mod);
|
|
|
|
/* Start the module */
|
|
if (mod->init != NULL)
|
|
ret = mod->init();
|
|
if (ret < 0) {
|
|
/* Init routine failed: abort. Try to protect us from
|
|
buggy refcounters. */
|
|
mod->state = MODULE_STATE_GOING;
|
|
synchronize_sched();
|
|
if (mod->unsafe)
|
|
printk(KERN_ERR "%s: module is now stuck!\n",
|
|
mod->name);
|
|
else {
|
|
module_put(mod);
|
|
mutex_lock(&module_mutex);
|
|
free_module(mod);
|
|
mutex_unlock(&module_mutex);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* Now it's a first class citizen! */
|
|
mutex_lock(&module_mutex);
|
|
mod->state = MODULE_STATE_LIVE;
|
|
/* Drop initial reference. */
|
|
module_put(mod);
|
|
unwind_remove_table(mod->unwind_info, 1);
|
|
module_free(mod, mod->module_init);
|
|
mod->module_init = NULL;
|
|
mod->init_size = 0;
|
|
mod->init_text_size = 0;
|
|
mutex_unlock(&module_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int within(unsigned long addr, void *start, unsigned long size)
|
|
{
|
|
return ((void *)addr >= start && (void *)addr < start + size);
|
|
}
|
|
|
|
#ifdef CONFIG_KALLSYMS
|
|
/*
|
|
* This ignores the intensely annoying "mapping symbols" found
|
|
* in ARM ELF files: $a, $t and $d.
|
|
*/
|
|
static inline int is_arm_mapping_symbol(const char *str)
|
|
{
|
|
return str[0] == '$' && strchr("atd", str[1])
|
|
&& (str[2] == '\0' || str[2] == '.');
|
|
}
|
|
|
|
static const char *get_ksymbol(struct module *mod,
|
|
unsigned long addr,
|
|
unsigned long *size,
|
|
unsigned long *offset)
|
|
{
|
|
unsigned int i, best = 0;
|
|
unsigned long nextval;
|
|
|
|
/* At worse, next value is at end of module */
|
|
if (within(addr, mod->module_init, mod->init_size))
|
|
nextval = (unsigned long)mod->module_init+mod->init_text_size;
|
|
else
|
|
nextval = (unsigned long)mod->module_core+mod->core_text_size;
|
|
|
|
/* Scan for closest preceeding symbol, and next symbol. (ELF
|
|
starts real symbols at 1). */
|
|
for (i = 1; i < mod->num_symtab; i++) {
|
|
if (mod->symtab[i].st_shndx == SHN_UNDEF)
|
|
continue;
|
|
|
|
/* We ignore unnamed symbols: they're uninformative
|
|
* and inserted at a whim. */
|
|
if (mod->symtab[i].st_value <= addr
|
|
&& mod->symtab[i].st_value > mod->symtab[best].st_value
|
|
&& *(mod->strtab + mod->symtab[i].st_name) != '\0'
|
|
&& !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
|
|
best = i;
|
|
if (mod->symtab[i].st_value > addr
|
|
&& mod->symtab[i].st_value < nextval
|
|
&& *(mod->strtab + mod->symtab[i].st_name) != '\0'
|
|
&& !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
|
|
nextval = mod->symtab[i].st_value;
|
|
}
|
|
|
|
if (!best)
|
|
return NULL;
|
|
|
|
if (size)
|
|
*size = nextval - mod->symtab[best].st_value;
|
|
if (offset)
|
|
*offset = addr - mod->symtab[best].st_value;
|
|
return mod->strtab + mod->symtab[best].st_name;
|
|
}
|
|
|
|
/* For kallsyms to ask for address resolution. NULL means not found.
|
|
We don't lock, as this is used for oops resolution and races are a
|
|
lesser concern. */
|
|
const char *module_address_lookup(unsigned long addr,
|
|
unsigned long *size,
|
|
unsigned long *offset,
|
|
char **modname)
|
|
{
|
|
struct module *mod;
|
|
|
|
list_for_each_entry(mod, &modules, list) {
|
|
if (within(addr, mod->module_init, mod->init_size)
|
|
|| within(addr, mod->module_core, mod->core_size)) {
|
|
if (modname)
|
|
*modname = mod->name;
|
|
return get_ksymbol(mod, addr, size, offset);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int lookup_module_symbol_name(unsigned long addr, char *symname)
|
|
{
|
|
struct module *mod;
|
|
|
|
mutex_lock(&module_mutex);
|
|
list_for_each_entry(mod, &modules, list) {
|
|
if (within(addr, mod->module_init, mod->init_size) ||
|
|
within(addr, mod->module_core, mod->core_size)) {
|
|
const char *sym;
|
|
|
|
sym = get_ksymbol(mod, addr, NULL, NULL);
|
|
if (!sym)
|
|
goto out;
|
|
strlcpy(symname, sym, KSYM_NAME_LEN + 1);
|
|
mutex_unlock(&module_mutex);
|
|
return 0;
|
|
}
|
|
}
|
|
out:
|
|
mutex_unlock(&module_mutex);
|
|
return -ERANGE;
|
|
}
|
|
|
|
int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
|
|
unsigned long *offset, char *modname, char *name)
|
|
{
|
|
struct module *mod;
|
|
|
|
mutex_lock(&module_mutex);
|
|
list_for_each_entry(mod, &modules, list) {
|
|
if (within(addr, mod->module_init, mod->init_size) ||
|
|
within(addr, mod->module_core, mod->core_size)) {
|
|
const char *sym;
|
|
|
|
sym = get_ksymbol(mod, addr, size, offset);
|
|
if (!sym)
|
|
goto out;
|
|
if (modname)
|
|
strlcpy(modname, mod->name, MODULE_NAME_LEN + 1);
|
|
if (name)
|
|
strlcpy(name, sym, KSYM_NAME_LEN + 1);
|
|
mutex_unlock(&module_mutex);
|
|
return 0;
|
|
}
|
|
}
|
|
out:
|
|
mutex_unlock(&module_mutex);
|
|
return -ERANGE;
|
|
}
|
|
|
|
int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
|
|
char *name, char *module_name, int *exported)
|
|
{
|
|
struct module *mod;
|
|
|
|
mutex_lock(&module_mutex);
|
|
list_for_each_entry(mod, &modules, list) {
|
|
if (symnum < mod->num_symtab) {
|
|
*value = mod->symtab[symnum].st_value;
|
|
*type = mod->symtab[symnum].st_info;
|
|
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
|
|
KSYM_NAME_LEN + 1);
|
|
strlcpy(module_name, mod->name, MODULE_NAME_LEN + 1);
|
|
*exported = is_exported(name, mod);
|
|
mutex_unlock(&module_mutex);
|
|
return 0;
|
|
}
|
|
symnum -= mod->num_symtab;
|
|
}
|
|
mutex_unlock(&module_mutex);
|
|
return -ERANGE;
|
|
}
|
|
|
|
static unsigned long mod_find_symname(struct module *mod, const char *name)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < mod->num_symtab; i++)
|
|
if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
|
|
mod->symtab[i].st_info != 'U')
|
|
return mod->symtab[i].st_value;
|
|
return 0;
|
|
}
|
|
|
|
/* Look for this name: can be of form module:name. */
|
|
unsigned long module_kallsyms_lookup_name(const char *name)
|
|
{
|
|
struct module *mod;
|
|
char *colon;
|
|
unsigned long ret = 0;
|
|
|
|
/* Don't lock: we're in enough trouble already. */
|
|
if ((colon = strchr(name, ':')) != NULL) {
|
|
*colon = '\0';
|
|
if ((mod = find_module(name)) != NULL)
|
|
ret = mod_find_symname(mod, colon+1);
|
|
*colon = ':';
|
|
} else {
|
|
list_for_each_entry(mod, &modules, list)
|
|
if ((ret = mod_find_symname(mod, name)) != 0)
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_KALLSYMS */
|
|
|
|
/* Called by the /proc file system to return a list of modules. */
|
|
static void *m_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
struct list_head *i;
|
|
loff_t n = 0;
|
|
|
|
mutex_lock(&module_mutex);
|
|
list_for_each(i, &modules) {
|
|
if (n++ == *pos)
|
|
break;
|
|
}
|
|
if (i == &modules)
|
|
return NULL;
|
|
return i;
|
|
}
|
|
|
|
static void *m_next(struct seq_file *m, void *p, loff_t *pos)
|
|
{
|
|
struct list_head *i = p;
|
|
(*pos)++;
|
|
if (i->next == &modules)
|
|
return NULL;
|
|
return i->next;
|
|
}
|
|
|
|
static void m_stop(struct seq_file *m, void *p)
|
|
{
|
|
mutex_unlock(&module_mutex);
|
|
}
|
|
|
|
static char *taint_flags(unsigned int taints, char *buf)
|
|
{
|
|
int bx = 0;
|
|
|
|
if (taints) {
|
|
buf[bx++] = '(';
|
|
if (taints & TAINT_PROPRIETARY_MODULE)
|
|
buf[bx++] = 'P';
|
|
if (taints & TAINT_FORCED_MODULE)
|
|
buf[bx++] = 'F';
|
|
/*
|
|
* TAINT_FORCED_RMMOD: could be added.
|
|
* TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
|
|
* apply to modules.
|
|
*/
|
|
buf[bx++] = ')';
|
|
}
|
|
buf[bx] = '\0';
|
|
|
|
return buf;
|
|
}
|
|
|
|
static int m_show(struct seq_file *m, void *p)
|
|
{
|
|
struct module *mod = list_entry(p, struct module, list);
|
|
char buf[8];
|
|
|
|
seq_printf(m, "%s %lu",
|
|
mod->name, mod->init_size + mod->core_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. */
|
|
seq_printf(m, " 0x%p", mod->module_core);
|
|
|
|
/* Taints info */
|
|
if (mod->taints)
|
|
seq_printf(m, " %s", taint_flags(mod->taints, buf));
|
|
|
|
seq_printf(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 -.
|
|
*/
|
|
const struct seq_operations modules_op = {
|
|
.start = m_start,
|
|
.next = m_next,
|
|
.stop = m_stop,
|
|
.show = m_show
|
|
};
|
|
|
|
/* Given an address, look for it in the module exception tables. */
|
|
const struct exception_table_entry *search_module_extables(unsigned long addr)
|
|
{
|
|
unsigned long flags;
|
|
const struct exception_table_entry *e = NULL;
|
|
struct module *mod;
|
|
|
|
spin_lock_irqsave(&modlist_lock, flags);
|
|
list_for_each_entry(mod, &modules, list) {
|
|
if (mod->num_exentries == 0)
|
|
continue;
|
|
|
|
e = search_extable(mod->extable,
|
|
mod->extable + mod->num_exentries - 1,
|
|
addr);
|
|
if (e)
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&modlist_lock, flags);
|
|
|
|
/* Now, if we found one, we are running inside it now, hence
|
|
we cannot unload the module, hence no refcnt needed. */
|
|
return e;
|
|
}
|
|
|
|
/*
|
|
* Is this a valid module address?
|
|
*/
|
|
int is_module_address(unsigned long addr)
|
|
{
|
|
unsigned long flags;
|
|
struct module *mod;
|
|
|
|
spin_lock_irqsave(&modlist_lock, flags);
|
|
|
|
list_for_each_entry(mod, &modules, list) {
|
|
if (within(addr, mod->module_core, mod->core_size)) {
|
|
spin_unlock_irqrestore(&modlist_lock, flags);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&modlist_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Is this a valid kernel address? We don't grab the lock: we are oopsing. */
|
|
struct module *__module_text_address(unsigned long addr)
|
|
{
|
|
struct module *mod;
|
|
|
|
list_for_each_entry(mod, &modules, list)
|
|
if (within(addr, mod->module_init, mod->init_text_size)
|
|
|| within(addr, mod->module_core, mod->core_text_size))
|
|
return mod;
|
|
return NULL;
|
|
}
|
|
|
|
struct module *module_text_address(unsigned long addr)
|
|
{
|
|
struct module *mod;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&modlist_lock, flags);
|
|
mod = __module_text_address(addr);
|
|
spin_unlock_irqrestore(&modlist_lock, flags);
|
|
|
|
return mod;
|
|
}
|
|
|
|
/* Don't grab lock, we're oopsing. */
|
|
void print_modules(void)
|
|
{
|
|
struct module *mod;
|
|
char buf[8];
|
|
|
|
printk("Modules linked in:");
|
|
list_for_each_entry(mod, &modules, list)
|
|
printk(" %s%s", mod->name, taint_flags(mod->taints, buf));
|
|
printk("\n");
|
|
}
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
static char *make_driver_name(struct device_driver *drv)
|
|
{
|
|
char *driver_name;
|
|
|
|
driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2,
|
|
GFP_KERNEL);
|
|
if (!driver_name)
|
|
return NULL;
|
|
|
|
sprintf(driver_name, "%s:%s", drv->bus->name, drv->name);
|
|
return driver_name;
|
|
}
|
|
|
|
static void module_create_drivers_dir(struct module_kobject *mk)
|
|
{
|
|
if (!mk || mk->drivers_dir)
|
|
return;
|
|
|
|
mk->drivers_dir = kobject_add_dir(&mk->kobj, "drivers");
|
|
}
|
|
|
|
void module_add_driver(struct module *mod, struct device_driver *drv)
|
|
{
|
|
char *driver_name;
|
|
int no_warn;
|
|
struct module_kobject *mk = NULL;
|
|
|
|
if (!drv)
|
|
return;
|
|
|
|
if (mod)
|
|
mk = &mod->mkobj;
|
|
else if (drv->mod_name) {
|
|
struct kobject *mkobj;
|
|
|
|
/* Lookup built-in module entry in /sys/modules */
|
|
mkobj = kset_find_obj(&module_subsys, drv->mod_name);
|
|
if (mkobj) {
|
|
mk = container_of(mkobj, struct module_kobject, kobj);
|
|
/* remember our module structure */
|
|
drv->mkobj = mk;
|
|
/* kset_find_obj took a reference */
|
|
kobject_put(mkobj);
|
|
}
|
|
}
|
|
|
|
if (!mk)
|
|
return;
|
|
|
|
/* Don't check return codes; these calls are idempotent */
|
|
no_warn = sysfs_create_link(&drv->kobj, &mk->kobj, "module");
|
|
driver_name = make_driver_name(drv);
|
|
if (driver_name) {
|
|
module_create_drivers_dir(mk);
|
|
no_warn = sysfs_create_link(mk->drivers_dir, &drv->kobj,
|
|
driver_name);
|
|
kfree(driver_name);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(module_add_driver);
|
|
|
|
void module_remove_driver(struct device_driver *drv)
|
|
{
|
|
struct module_kobject *mk = NULL;
|
|
char *driver_name;
|
|
|
|
if (!drv)
|
|
return;
|
|
|
|
sysfs_remove_link(&drv->kobj, "module");
|
|
|
|
if (drv->owner)
|
|
mk = &drv->owner->mkobj;
|
|
else if (drv->mkobj)
|
|
mk = drv->mkobj;
|
|
if (mk && mk->drivers_dir) {
|
|
driver_name = make_driver_name(drv);
|
|
if (driver_name) {
|
|
sysfs_remove_link(mk->drivers_dir, driver_name);
|
|
kfree(driver_name);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(module_remove_driver);
|
|
#endif
|
|
|
|
#ifdef CONFIG_MODVERSIONS
|
|
/* Generate the signature for struct module here, too, for modversions. */
|
|
void struct_module(struct module *mod) { return; }
|
|
EXPORT_SYMBOL(struct_module);
|
|
#endif
|