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Minor fixes mainly, including a potential use-after-free on remove found by

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CONFIG_DEBUG_KOBJECT_RELEASE which may be theoretical.
 
 Cheers,
 Rusty.
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Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull module updates from Rusty Russell:
 "Minor fixes mainly, including a potential use-after-free on remove
  found by CONFIG_DEBUG_KOBJECT_RELEASE which may be theoretical"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  module: Fix mod->mkobj.kobj potentially freed too early
  kernel/params.c: use scnprintf() instead of sprintf()
  kernel/module.c: use scnprintf() instead of sprintf()
  module/lsm: Have apparmor module parameters work with no args
  module: Add NOARG flag for ops with param_set_bool_enable_only() set function
  module: Add flag to allow mod params to have no arguments
  modules: add support for soft module dependencies
  scripts/mod/modpost.c: permit '.cranges' secton for sh64 architecture.
  module: fix sprintf format specifier in param_get_byte()
This commit is contained in:
Linus Torvalds 2013-09-04 17:34:29 -07:00
commit 3398d252a4
6 changed files with 50 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/module.h
View File

@ -42,6 +42,7 @@ struct module_kobject {
struct module *mod;
struct kobject *drivers_dir;
struct module_param_attrs *mp;
struct completion *kobj_completion;
};
struct module_attribute {
@ -97,6 +98,11 @@ extern const struct gtype##_id __mod_##gtype##_table \
/* For userspace: you can also call me... */
#define MODULE_ALIAS(_alias) MODULE_INFO(alias, _alias)
/* Soft module dependencies. See man modprobe.d for details.
* Example: MODULE_SOFTDEP("pre: module-foo module-bar post: module-baz")
*/
#define MODULE_SOFTDEP(_softdep) MODULE_INFO(softdep, _softdep)
/*
* The following license idents are currently accepted as indicating free
* software modules

13
include/linux/moduleparam.h
View File

@ -36,7 +36,18 @@ static const char __UNIQUE_ID(name)[] \
struct kernel_param;
/*
* Flags available for kernel_param_ops
*
* NOARG - the parameter allows for no argument (foo instead of foo=1)
*/
enum {
KERNEL_PARAM_FL_NOARG = (1 << 0)
};
struct kernel_param_ops {
/* How the ops should behave */
unsigned int flags;
/* Returns 0, or -errno. arg is in kp->arg. */
int (*set)(const char *val, const struct kernel_param *kp);
/* Returns length written or -errno. Buffer is 4k (ie. be short!) */
@ -187,7 +198,7 @@ struct kparam_array
/* Obsolete - use module_param_cb() */
#define module_param_call(name, set, get, arg, perm) \
static struct kernel_param_ops __param_ops_##name = \
{ (void *)set, (void *)get }; \
{ 0, (void *)set, (void *)get }; \
__module_param_call(MODULE_PARAM_PREFIX, \
name, &__param_ops_##name, arg, \
(perm) + sizeof(__check_old_set_param(set))*0, -1)

17
kernel/module.c
View File

@ -136,6 +136,7 @@ static int param_set_bool_enable_only(const char *val,
}
static const struct kernel_param_ops param_ops_bool_enable_only = {
.flags = KERNEL_PARAM_FL_NOARG,
.set = param_set_bool_enable_only,
.get = param_get_bool,
};
@ -603,7 +604,7 @@ static void setup_modinfo_##field(struct module *mod, const char *s) \
static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
struct module_kobject *mk, char *buffer) \
{ \
return sprintf(buffer, "%s\n", mk->mod->field); \
return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
} \
static int modinfo_##field##_exists(struct module *mod) \
{ \
@ -1611,6 +1612,14 @@ static void module_remove_modinfo_attrs(struct module *mod)
kfree(mod->modinfo_attrs);
}
static void mod_kobject_put(struct module *mod)
{
DECLARE_COMPLETION_ONSTACK(c);
mod->mkobj.kobj_completion = &c;
kobject_put(&mod->mkobj.kobj);
wait_for_completion(&c);
}
static int mod_sysfs_init(struct module *mod)
{
int err;
@ -1638,7 +1647,7 @@ static int mod_sysfs_init(struct module *mod)
err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
"%s", mod->name);
if (err)
kobject_put(&mod->mkobj.kobj);
mod_kobject_put(mod);
/* delay uevent until full sysfs population */
out:
@ -1682,7 +1691,7 @@ out_unreg_param:
out_unreg_holders:
kobject_put(mod->holders_dir);
out_unreg:
kobject_put(&mod->mkobj.kobj);
mod_kobject_put(mod);
out:
return err;
}
@ -1691,7 +1700,7 @@ static void mod_sysfs_fini(struct module *mod)
{
remove_notes_attrs(mod);
remove_sect_attrs(mod);
kobject_put(&mod->mkobj.kobj);
mod_kobject_put(mod);
}
#else /* !CONFIG_SYSFS */

22
kernel/params.c
View File

@ -103,8 +103,8 @@ static int parse_one(char *param,
|| 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)
if (!val &&
!(params[i].ops->flags & KERNEL_PARAM_FL_NOARG))
return -EINVAL;
pr_debug("handling %s with %p\n", param,
params[i].ops->set);
@ -241,7 +241,8 @@ int parse_args(const char *doing,
} \
int param_get_##name(char *buffer, const struct kernel_param *kp) \
{ \
return sprintf(buffer, format, *((type *)kp->arg)); \
return scnprintf(buffer, PAGE_SIZE, format, \
*((type *)kp->arg)); \
} \
struct kernel_param_ops param_ops_##name = { \
.set = param_set_##name, \
@ -252,7 +253,7 @@ int parse_args(const char *doing,
EXPORT_SYMBOL(param_ops_##name)
STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul);
STANDARD_PARAM_DEF(byte, unsigned char, "%hhu", unsigned long, strict_strtoul);
STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol);
STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul);
STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol);
@ -285,7 +286,7 @@ EXPORT_SYMBOL(param_set_charp);
int param_get_charp(char *buffer, const struct kernel_param *kp)
{
return sprintf(buffer, "%s", *((char **)kp->arg));
return scnprintf(buffer, PAGE_SIZE, "%s", *((char **)kp->arg));
}
EXPORT_SYMBOL(param_get_charp);
@ -320,6 +321,7 @@ int param_get_bool(char *buffer, const struct kernel_param *kp)
EXPORT_SYMBOL(param_get_bool);
struct kernel_param_ops param_ops_bool = {
.flags = KERNEL_PARAM_FL_NOARG,
.set = param_set_bool,
.get = param_get_bool,
};
@ -370,6 +372,7 @@ int param_set_bint(const char *val, const struct kernel_param *kp)
EXPORT_SYMBOL(param_set_bint);
struct kernel_param_ops param_ops_bint = {
.flags = KERNEL_PARAM_FL_NOARG,
.set = param_set_bint,
.get = param_get_int,
};
@ -827,7 +830,7 @@ ssize_t __modver_version_show(struct module_attribute *mattr,
struct module_version_attribute *vattr =
container_of(mattr, struct module_version_attribute, mattr);
return sprintf(buf, "%s\n", vattr->version);
return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version);
}
extern const struct module_version_attribute *__start___modver[];
@ -912,7 +915,14 @@ static const struct kset_uevent_ops module_uevent_ops = {
struct kset *module_kset;
int module_sysfs_initialized;
static void module_kobj_release(struct kobject *kobj)
{
struct module_kobject *mk = to_module_kobject(kobj);
complete(mk->kobj_completion);
}
struct kobj_type module_ktype = {
.release = module_kobj_release,
.sysfs_ops = &module_sysfs_ops,
};

1
scripts/mod/modpost.c
View File

@ -821,6 +821,7 @@ static const char *section_white_list[] =
{
".comment*",
".debug*",
".cranges", /* sh64 */
".zdebug*", /* Compressed debug sections. */
".GCC-command-line", /* mn10300 */
".GCC.command.line", /* record-gcc-switches, non mn10300 */

2
security/apparmor/lsm.c
View File

@ -666,6 +666,7 @@ static int param_set_aabool(const char *val, const struct kernel_param *kp);
static int param_get_aabool(char *buffer, const struct kernel_param *kp);
#define param_check_aabool param_check_bool
static struct kernel_param_ops param_ops_aabool = {
.flags = KERNEL_PARAM_FL_NOARG,
.set = param_set_aabool,
.get = param_get_aabool
};
@ -682,6 +683,7 @@ static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp
static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
#define param_check_aalockpolicy param_check_bool
static struct kernel_param_ops param_ops_aalockpolicy = {
.flags = KERNEL_PARAM_FL_NOARG,
.set = param_set_aalockpolicy,
.get = param_get_aalockpolicy
};