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module: add new state MODULE_STATE_UNFORMED. 

You should never look at such a module, so it's excised from all paths
which traverse the modules list.

We add the state at the end, to avoid gratuitous ABI break (ksplice).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2013-01-12 11:38:44 +10:30
parent 52441fa8f2
commit 0d21b0e347
3 changed files with 59 additions and 10 deletions
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10
include/linux/module.h
View File

@ -199,11 +199,11 @@ struct module_use {
struct module *source, *target;
};
enum module_state
{
MODULE_STATE_LIVE,
MODULE_STATE_COMING,
MODULE_STATE_GOING,
enum module_state {
MODULE_STATE_LIVE, /* Normal state. */
MODULE_STATE_COMING, /* Full formed, running module_init. */
MODULE_STATE_GOING, /* Going away. */
MODULE_STATE_UNFORMED, /* Still setting it up. */
};
/**

2
kernel/debug/kdb/kdb_main.c
View File

@ -1970,6 +1970,8 @@ static int kdb_lsmod(int argc, const char **argv)
kdb_printf("Module Size modstruct Used by\n");
list_for_each_entry(mod, kdb_modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
kdb_printf("%-20s%8u 0x%p ", mod->name,
mod->core_size, (void *)mod);

57
kernel/module.c
View File

@ -188,6 +188,7 @@ struct load_info {
ongoing or failed initialization etc. */
static inline int strong_try_module_get(struct module *mod)
{
BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
if (mod && mod->state == MODULE_STATE_COMING)
return -EBUSY;
if (try_module_get(mod))
@ -343,6 +344,9 @@ bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
#endif
};
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
return true;
}
@ -450,16 +454,24 @@ const struct kernel_symbol *find_symbol(const char *name,
EXPORT_SYMBOL_GPL(find_symbol);
/* Search for module by name: must hold module_mutex. */
struct module *find_module(const char *name)
static struct module *find_module_all(const char *name,
bool even_unformed)
{
struct module *mod;
list_for_each_entry(mod, &modules, list) {
if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
continue;
if (strcmp(mod->name, name) == 0)
return mod;
}
return NULL;
}
struct module *find_module(const char *name)
{
return find_module_all(name, false);
}
EXPORT_SYMBOL_GPL(find_module);
#ifdef CONFIG_SMP
@ -525,6 +537,8 @@ bool is_module_percpu_address(unsigned long addr)
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (!mod->percpu_size)
continue;
for_each_possible_cpu(cpu) {
@ -1048,6 +1062,8 @@ static ssize_t show_initstate(struct module_attribute *mattr,
case MODULE_STATE_GOING:
state = "going";
break;
default:
BUG();
}
return sprintf(buffer, "%s\n", state);
}
@ -1786,6 +1802,8 @@ void set_all_modules_text_rw(void)
mutex_lock(&module_mutex);
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if ((mod->module_core) && (mod->core_text_size)) {
set_page_attributes(mod->module_core,
mod->module_core + mod->core_text_size,
@ -1807,6 +1825,8 @@ void set_all_modules_text_ro(void)
mutex_lock(&module_mutex);
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if ((mod->module_core) && (mod->core_text_size)) {
set_page_attributes(mod->module_core,
mod->module_core + mod->core_text_size,
@ -2998,7 +3018,8 @@ static bool finished_loading(const char *name)
mutex_lock(&module_mutex);
mod = find_module(name);
ret = !mod || mod->state != MODULE_STATE_COMING;
ret = !mod || mod->state == MODULE_STATE_LIVE
|| mod->state == MODULE_STATE_GOING;
mutex_unlock(&module_mutex);
return ret;
@ -3361,6 +3382,8 @@ const char *module_address_lookup(unsigned long addr,
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_init(addr, mod) ||
within_module_core(addr, mod)) {
if (modname)
@ -3384,6 +3407,8 @@ int lookup_module_symbol_name(unsigned long addr, char *symname)
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_init(addr, mod) ||
within_module_core(addr, mod)) {
const char *sym;
@ -3408,6 +3433,8 @@ int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_init(addr, mod) ||
within_module_core(addr, mod)) {
const char *sym;
@ -3435,6 +3462,8 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (symnum < mod->num_symtab) {
*value = mod->symtab[symnum].st_value;
*type = mod->symtab[symnum].st_info;
@ -3477,9 +3506,12 @@ unsigned long module_kallsyms_lookup_name(const char *name)
ret = mod_find_symname(mod, colon+1);
*colon = ':';
} else {
list_for_each_entry_rcu(mod, &modules, list)
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if ((ret = mod_find_symname(mod, name)) != 0)
break;
}
}
preempt_enable();
return ret;
@ -3494,6 +3526,8 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
int ret;
list_for_each_entry(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
for (i = 0; i < mod->num_symtab; i++) {
ret = fn(data, mod->strtab + mod->symtab[i].st_name,
mod, mod->symtab[i].st_value);
@ -3509,6 +3543,7 @@ static char *module_flags(struct module *mod, char *buf)
{
int bx = 0;
BUG_ON(mod->state == MODULE_STATE_UNFORMED);
if (mod->taints ||
mod->state == MODULE_STATE_GOING ||
mod->state == MODULE_STATE_COMING) {
@ -3550,6 +3585,10 @@ static int m_show(struct seq_file *m, void *p)
struct module *mod = list_entry(p, struct module, list);
char buf[8];
/* We always ignore unformed modules. */
if (mod->state == MODULE_STATE_UNFORMED)
return 0;
seq_printf(m, "%s %u",
mod->name, mod->init_size + mod->core_size);
print_unload_info(m, mod);
@ -3610,6 +3649,8 @@ const struct exception_table_entry *search_module_extables(unsigned long addr)
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (mod->num_exentries == 0)
continue;
@ -3658,10 +3699,13 @@ struct module *__module_address(unsigned long addr)
if (addr < module_addr_min || addr > module_addr_max)
return NULL;
list_for_each_entry_rcu(mod, &modules, list)
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
if (within_module_core(addr, mod)
|| within_module_init(addr, mod))
return mod;
}
return NULL;
}
EXPORT_SYMBOL_GPL(__module_address);
@ -3714,8 +3758,11 @@ void print_modules(void)
printk(KERN_DEFAULT "Modules linked in:");
/* Most callers should already have preempt disabled, but make sure */
preempt_disable();
list_for_each_entry_rcu(mod, &modules, list)
list_for_each_entry_rcu(mod, &modules, list) {
if (mod->state == MODULE_STATE_UNFORMED)
continue;
printk(" %s%s", mod->name, module_flags(mod, buf));
}
preempt_enable();
if (last_unloaded_module[0])
printk(" [last unloaded: %s]", last_unloaded_module);