diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/module.c | 37 | ||||
| -rw-r--r-- | kernel/params.c | 39 |
2 files changed, 48 insertions, 28 deletions
diff --git a/kernel/module.c b/kernel/module.c index 2c932760fd3..78ac6ec1e42 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -105,6 +105,7 @@ struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ /* Block module loading/unloading? */ int modules_disabled = 0; +core_param(nomodule, modules_disabled, bint, 0); /* Waiting for a module to finish initializing? */ static DECLARE_WAIT_QUEUE_HEAD(module_wq); @@ -903,6 +904,36 @@ static ssize_t show_refcnt(struct module_attribute *mattr, static struct module_attribute modinfo_refcnt = __ATTR(refcnt, 0444, show_refcnt, NULL); +void __module_get(struct module *module) +{ + if (module) { + preempt_disable(); + __this_cpu_inc(module->refptr->incs); + trace_module_get(module, _RET_IP_); + preempt_enable(); + } +} +EXPORT_SYMBOL(__module_get); + +bool try_module_get(struct module *module) +{ + bool ret = true; + + if (module) { + preempt_disable(); + + if (likely(module_is_live(module))) { + __this_cpu_inc(module->refptr->incs); + trace_module_get(module, _RET_IP_); + } else + ret = false; + + preempt_enable(); + } + return ret; +} +EXPORT_SYMBOL(try_module_get); + void module_put(struct module *module) { if (module) { @@ -2380,8 +2411,7 @@ static int copy_and_check(struct load_info *info, return -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) + if ((hdr = vmalloc(len)) == NULL) return -ENOMEM; if (copy_from_user(hdr, umod, len) != 0) { @@ -2922,7 +2952,8 @@ static struct module *load_module(void __user *umod, mutex_unlock(&module_mutex); /* Module is ready to execute: parsing args may do that. */ - err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, NULL); + err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, + -32768, 32767, NULL); if (err < 0) goto unlink; diff --git a/kernel/params.c b/kernel/params.c index 47f5bf12434..f37d8263134 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -87,6 +87,8 @@ static int parse_one(char *param, char *val, const struct kernel_param *params, unsigned num_params, + s16 min_level, + s16 max_level, int (*handle_unknown)(char *param, char *val)) { unsigned int i; @@ -95,6 +97,9 @@ static int parse_one(char *param, /* Find parameter */ for (i = 0; i < num_params; i++) { if (parameq(param, params[i].name)) { + if (params[i].level < min_level + || params[i].level > max_level) + return 0; /* No one handled NULL, so do it here. */ if (!val && params[i].ops->set != param_set_bool && params[i].ops->set != param_set_bint) @@ -174,6 +179,8 @@ int parse_args(const char *name, char *args, const struct kernel_param *params, unsigned num, + s16 min_level, + s16 max_level, int (*unknown)(char *param, char *val)) { char *param, *val; @@ -189,7 +196,8 @@ int parse_args(const char *name, args = next_arg(args, ¶m, &val); irq_was_disabled = irqs_disabled(); - ret = parse_one(param, val, params, num, unknown); + ret = parse_one(param, val, params, num, + min_level, max_level, unknown); if (irq_was_disabled && !irqs_disabled()) { printk(KERN_WARNING "parse_args(): option '%s' enabled " "irq's!\n", param); @@ -297,35 +305,18 @@ EXPORT_SYMBOL(param_ops_charp); /* Actually could be a bool or an int, for historical reasons. */ int param_set_bool(const char *val, const struct kernel_param *kp) { - bool v; - int ret; - /* No equals means "set"... */ if (!val) val = "1"; /* One of =[yYnN01] */ - ret = strtobool(val, &v); - if (ret) - return ret; - - if (kp->flags & KPARAM_ISBOOL) - *(bool *)kp->arg = v; - else - *(int *)kp->arg = v; - return 0; + return strtobool(val, kp->arg); } EXPORT_SYMBOL(param_set_bool); int param_get_bool(char *buffer, const struct kernel_param *kp) { - bool val; - if (kp->flags & KPARAM_ISBOOL) - val = *(bool *)kp->arg; - else - val = *(int *)kp->arg; - /* Y and N chosen as being relatively non-coder friendly */ - return sprintf(buffer, "%c", val ? 'Y' : 'N'); + return sprintf(buffer, "%c", *(bool *)kp->arg ? 'Y' : 'N'); } EXPORT_SYMBOL(param_get_bool); @@ -343,7 +334,6 @@ int param_set_invbool(const char *val, const struct kernel_param *kp) struct kernel_param dummy; dummy.arg = &boolval; - dummy.flags = KPARAM_ISBOOL; ret = param_set_bool(val, &dummy); if (ret == 0) *(bool *)kp->arg = !boolval; @@ -372,7 +362,6 @@ int param_set_bint(const char *val, const struct kernel_param *kp) /* Match bool exactly, by re-using it. */ boolkp = *kp; boolkp.arg = &v; - boolkp.flags |= KPARAM_ISBOOL; ret = param_set_bool(val, &boolkp); if (ret == 0) @@ -393,7 +382,7 @@ static int param_array(const char *name, unsigned int min, unsigned int max, void *elem, int elemsize, int (*set)(const char *, const struct kernel_param *kp), - u16 flags, + s16 level, unsigned int *num) { int ret; @@ -403,7 +392,7 @@ static int param_array(const char *name, /* Get the name right for errors. */ kp.name = name; kp.arg = elem; - kp.flags = flags; + kp.level = level; *num = 0; /* We expect a comma-separated list of values. */ @@ -444,7 +433,7 @@ static int param_array_set(const char *val, const struct kernel_param *kp) unsigned int temp_num; return param_array(kp->name, val, 1, arr->max, arr->elem, - arr->elemsize, arr->ops->set, kp->flags, + arr->elemsize, arr->ops->set, kp->level, arr->num ?: &temp_num); } |