#include <asm/semaphore.h>
#include <asm/cacheflush.h>
#include <linux/license.h>
+#include <asm/sections.h>
#if 0
#define DEBUGP printk
static DEFINE_MUTEX(module_mutex);
static LIST_HEAD(modules);
+/* Waiting for a module to finish initializing? */
+static DECLARE_WAIT_QUEUE_HEAD(module_wq);
+
static BLOCKING_NOTIFIER_HEAD(module_notify_list);
int register_module_notifier(struct notifier_block * nb)
static inline int strong_try_module_get(struct module *mod)
{
if (mod && mod->state == MODULE_STATE_COMING)
+ return -EBUSY;
+ if (try_module_get(mod))
return 0;
- return try_module_get(mod);
+ else
+ return -ENOENT;
}
static inline void add_taint_module(struct module *mod, unsigned flag)
}
}
DEBUGP("Failed to find symbol %s\n", name);
- return 0;
+ return -ENOENT;
}
/* Search for module by name: must hold module_mutex. */
return val;
}
-/* Created by linker magic */
-extern char __per_cpu_start[], __per_cpu_end[];
-
static void *percpu_modalloc(unsigned long size, unsigned long align,
const char *name)
{
return find_sec(hdr, sechdrs, secstrings, ".data.percpu");
}
+static void percpu_modcopy(void *pcpudest, const void *from, unsigned long size)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu)
+ memcpy(pcpudest + per_cpu_offset(cpu), from, size);
+}
+
static int percpu_modinit(void)
{
pcpu_num_used = 2;
static int use_module(struct module *a, struct module *b)
{
struct module_use *use;
- int no_warn;
+ int no_warn, err;
if (b == NULL || already_uses(a, b)) return 1;
- if (!strong_try_module_get(b))
+ /* If we're interrupted or time out, we fail. */
+ if (wait_event_interruptible_timeout(
+ module_wq, (err = strong_try_module_get(b)) != -EBUSY,
+ 30 * HZ) <= 0) {
+ printk("%s: gave up waiting for init of module %s.\n",
+ a->name, b->name);
+ return 0;
+ }
+
+ /* If strong_try_module_get() returned a different error, we fail. */
+ if (err)
return 0;
DEBUGP("Allocating new usage for %s.\n", a->name);
mutex_lock(&module_mutex);
}
/* Store the name of the last unloaded module for diagnostic purposes */
- sprintf(last_unloaded_module, mod->name);
+ strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
free_module(mod);
out:
const unsigned long *crc;
preempt_disable();
- if (!__find_symbol(symbol, &owner, &crc, 1))
+ if (IS_ERR_VALUE(__find_symbol(symbol, &owner, &crc, 1)))
BUG();
module_put(owner);
preempt_enable();
static inline int use_module(struct module *a, struct module *b)
{
- return strong_try_module_get(b);
+ return strong_try_module_get(b) == 0;
}
static inline void module_unload_init(struct module *mod)
const unsigned long *crc;
struct module *owner;
- if (!__find_symbol("struct_module", &owner, &crc, 1))
+ if (IS_ERR_VALUE(__find_symbol("struct_module",
+ &owner, &crc, 1)))
BUG();
return check_version(sechdrs, versindex, "struct_module", mod,
crc);
ret = __find_symbol(name, &owner, &crc,
!(mod->taints & TAINT_PROPRIETARY_MODULE));
- if (ret) {
+ if (!IS_ERR_VALUE(ret)) {
/* use_module can fail due to OOM,
or module initialization or unloading */
if (!check_version(sechdrs, versindex, name, mod, crc) ||
!use_module(mod, owner))
- ret = 0;
+ ret = -EINVAL;
}
return ret;
}
-
/*
* /sys/module/foo/sections stuff
* J. Corbet <corbet@lwn.net>
*/
-#ifdef CONFIG_KALLSYMS
+#if defined(CONFIG_KALLSYMS) && defined(CONFIG_SYSFS)
static ssize_t module_sect_show(struct module_attribute *mattr,
struct module *mod, char *buf)
{
static inline void remove_notes_attrs(struct module *mod)
{
}
-#endif /* CONFIG_KALLSYMS */
+#endif
#ifdef CONFIG_SYSFS
int module_add_modinfo_attrs(struct module *mod)
}
kfree(mod->modinfo_attrs);
}
-#endif
-#ifdef CONFIG_SYSFS
int mod_sysfs_init(struct module *mod)
{
int err;
+ struct kobject *kobj;
if (!module_sysfs_initialized) {
printk(KERN_ERR "%s: module sysfs not initialized\n",
err = -EINVAL;
goto out;
}
+
+ kobj = kset_find_obj(module_kset, mod->name);
+ if (kobj) {
+ printk(KERN_ERR "%s: module is already loaded\n", mod->name);
+ kobject_put(kobj);
+ err = -EINVAL;
+ goto out;
+ }
+
mod->mkobj.mod = mod;
memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
kobject_put(&mod->mkobj.kobj);
}
+/*
+ * 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;
+}
+
/*
* unlink the module with the whole machine is stopped with interrupts off
* - this defends against kallsyms not taking locks
preempt_disable();
value = __find_symbol(symbol, &owner, &crc, 1);
- if (value && !strong_try_module_get(owner))
+ if (IS_ERR_VALUE(value))
+ value = 0;
+ else if (strong_try_module_get(owner))
value = 0;
preempt_enable();
const unsigned long *crc;
for (i = 0; i < mod->num_syms; i++)
- if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
+ if (!IS_ERR_VALUE(__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)) {
+ if (!IS_ERR_VALUE(__find_symbol(mod->gpl_syms[i].name,
+ &owner, &crc, 1))) {
name = mod->gpl_syms[i].name;
ret = -ENOEXEC;
goto dup;
strtab + sym[i].st_name, mod);
/* Ok if resolved. */
- if (sym[i].st_value != 0)
+ if (!IS_ERR_VALUE(sym[i].st_value))
break;
/* Ok if weak. */
if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
/* Set up license info based on the info section */
set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
+ /*
+ * ndiswrapper is under GPL by itself, but loads proprietary modules.
+ * Don't use add_taint_module(), as it would prevent ndiswrapper from
+ * using GPL-only symbols it needs.
+ */
if (strcmp(mod->name, "ndiswrapper") == 0)
add_taint(TAINT_PROPRIETARY_MODULE);
+
+ /* driverloader was caught wrongly pretending to be under GPL */
if (strcmp(mod->name, "driverloader") == 0)
add_taint_module(mod, TAINT_PROPRIETARY_MODULE);
#ifdef CONFIG_MARKERS
if (!mod->taints)
marker_update_probe_range(mod->markers,
- mod->markers + mod->num_markers, NULL, NULL);
+ mod->markers + mod->num_markers);
#endif
err = module_finalize(hdr, sechdrs, mod);
if (err < 0)
printk(KERN_WARNING "%s: Ignoring obsolete parameters\n",
mod->name);
+ /* Now sew it into the lists so we can get lockdep and oops
+ * info during argument parsing. Noone should access us, since
+ * strong_try_module_get() will fail. */
+ stop_machine_run(__link_module, mod, NR_CPUS);
+
/* Size of section 0 is 0, so this works well if no params */
err = parse_args(mod->name, mod->args,
(struct kernel_param *)
/ sizeof(struct kernel_param),
NULL);
if (err < 0)
- goto arch_cleanup;
+ goto unlink;
err = mod_sysfs_setup(mod,
(struct kernel_param *)
sechdrs[setupindex].sh_size
/ sizeof(struct kernel_param));
if (err < 0)
- goto arch_cleanup;
+ goto unlink;
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
/* Done! */
return mod;
- arch_cleanup:
+ unlink:
+ stop_machine_run(__unlink_module, mod, NR_CPUS);
module_arch_cleanup(mod);
cleanup:
kobject_del(&mod->mkobj.kobj);
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,
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);
mutex_lock(&module_mutex);
free_module(mod);
mutex_unlock(&module_mutex);
+ wake_up(&module_wq);
return ret;
}
mod->init_size = 0;
mod->init_text_size = 0;
mutex_unlock(&module_mutex);
+ wake_up(&module_wq);
return 0;
}
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. */
-/* FIXME: Risky: returns a pointer into a module w/o lock */
+/* For kallsyms to ask for address resolution. NULL means not found. Careful
+ * not to lock to avoid deadlock on oopses, simply disable preemption. */
const char *module_address_lookup(unsigned long addr,
- unsigned long *size,
- unsigned long *offset,
- char **modname)
+ unsigned long *size,
+ unsigned long *offset,
+ char **modname,
+ char *namebuf)
{
struct module *mod;
const char *ret = NULL;
break;
}
}
+ /* Make a copy in here where it's safe */
+ if (ret) {
+ strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
+ ret = namebuf;
+ }
preempt_enable();
return ret;
}
#endif
#ifdef CONFIG_MARKERS
-void module_update_markers(struct module *probe_module, int *refcount)
+void module_update_markers(void)
{
struct module *mod;
list_for_each_entry(mod, &modules, list)
if (!mod->taints)
marker_update_probe_range(mod->markers,
- mod->markers + mod->num_markers,
- probe_module, refcount);
+ mod->markers + mod->num_markers);
mutex_unlock(&module_mutex);
}
#endif
git.samba.org / sfrench / cifs-2.6.git / blobdiff