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Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

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Pull module update from Rusty Russell:
 "Nothing major: support for compressing modules, and auto-tainting
  params.

  PS. My virtio-next tree is empty: DaveM took the patches I had.  There
      might be a virtio-rng starvation fix, but so far it's a bit voodoo
      so I will get to that in the next two days or it will wait"

* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  moduleparam: Resolve missing-field-initializer warning
  kbuild: handle module compression while running 'make modules_install'.
  modinst: wrap long lines in order to enhance cmd_modules_install
  modsign: lookup lines ending in .ko in .mod files
  modpost: simplify file name generation of *.mod.c files
  modpost: reduce visibility of symbols and constify r/o arrays
  param: check for tainting before calling set op.
  drm/i915: taint the kernel if unsafe module parameters are set
  module: add module_param_unsafe and module_param_named_unsafe
  module: make it possible to have unsafe, tainting module params
  module: rename KERNEL_PARAM_FL_NOARG to avoid confusion
This commit is contained in:
Linus Torvalds
2014-10-07 20:17:38 -04:00
parent a40a7201a4 184c3fc3f5
commit bdf428feb2
11 changed files with 139 additions and 36 deletions
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50
include/linux/moduleparam.h
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@@ -42,7 +42,7 @@ struct kernel_param;
* NOARG - the parameter allows for no argument (foo instead of foo=1)
*/
enum {
KERNEL_PARAM_FL_NOARG = (1 << 0)
KERNEL_PARAM_OPS_FL_NOARG = (1 << 0)
};
struct kernel_param_ops {
@@ -56,11 +56,21 @@ struct kernel_param_ops {
void (*free)(void *arg);
};
/*
* Flags available for kernel_param
*
* UNSAFE - the parameter is dangerous and setting it will taint the kernel
*/
enum {
KERNEL_PARAM_FL_UNSAFE = (1 << 0)
};
struct kernel_param {
const char *name;
const struct kernel_param_ops *ops;
u16 perm;
s16 level;
s8 level;
u8 flags;
union {
void *arg;
const struct kparam_string *str;
@@ -112,6 +122,12 @@ struct kparam_array
#define module_param(name, type, perm) \
module_param_named(name, name, type, perm)
/**
* module_param_unsafe - same as module_param but taints kernel
*/
#define module_param_unsafe(name, type, perm) \
module_param_named_unsafe(name, name, type, perm)
/**
* module_param_named - typesafe helper for a renamed module/cmdline parameter
* @name: a valid C identifier which is the parameter name.
@@ -128,6 +144,14 @@ struct kparam_array
module_param_cb(name, &param_ops_##type, &value, perm); \
__MODULE_PARM_TYPE(name, #type)
/**
* module_param_named_unsafe - same as module_param_named but taints kernel
*/
#define module_param_named_unsafe(name, value, type, perm) \
param_check_##type(name, &(value)); \
module_param_cb_unsafe(name, &param_ops_##type, &value, perm); \
__MODULE_PARM_TYPE(name, #type)
/**
* module_param_cb - general callback for a module/cmdline parameter
* @name: a valid C identifier which is the parameter name.
@@ -137,7 +161,11 @@ struct kparam_array
* The ops can have NULL set or get functions.
*/
#define module_param_cb(name, ops, arg, perm) \
__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1)
__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, 0)
#define module_param_cb_unsafe(name, ops, arg, perm) \
__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, -1, \
KERNEL_PARAM_FL_UNSAFE)
/**
* <level>_param_cb - general callback for a module/cmdline parameter
@@ -149,7 +177,7 @@ struct kparam_array
* The ops can have NULL set or get functions.
*/
#define __level_param_cb(name, ops, arg, perm, level) \
__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level)
__module_param_call(MODULE_PARAM_PREFIX, name, ops, arg, perm, level, 0)
#define core_param_cb(name, ops, arg, perm) \
__level_param_cb(name, ops, arg, perm, 1)
@@ -184,22 +212,22 @@ struct kparam_array
/* This is the fundamental function for registering boot/module
parameters. */
#define __module_param_call(prefix, name, ops, arg, perm, level) \
#define __module_param_call(prefix, name, ops, arg, perm, level, flags) \
/* Default value instead of permissions? */ \
static const char __param_str_##name[] = prefix #name; \
static struct kernel_param __moduleparam_const __param_##name \
__used \
__attribute__ ((unused,__section__ ("__param"),aligned(sizeof(void *)))) \
= { __param_str_##name, ops, VERIFY_OCTAL_PERMISSIONS(perm), \
level, { arg } }
level, flags, { arg } }
/* Obsolete - use module_param_cb() */
#define module_param_call(name, set, get, arg, perm) \
static struct kernel_param_ops __param_ops_##name = \
{ 0, (void *)set, (void *)get }; \
{ .flags = 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)
(perm) + sizeof(__check_old_set_param(set))*0, -1, 0)
/* We don't get oldget: it's often a new-style param_get_uint, etc. */
static inline int
@@ -279,7 +307,7 @@ static inline void __kernel_param_unlock(void)
*/
#define core_param(name, var, type, perm) \
param_check_##type(name, &(var)); \
__module_param_call("", name, &param_ops_##type, &var, perm, -1)
__module_param_call("", name, &param_ops_##type, &var, perm, -1, 0)
#endif /* !MODULE */
/**
@@ -297,7 +325,7 @@ static inline void __kernel_param_unlock(void)
= { len, string }; \
__module_param_call(MODULE_PARAM_PREFIX, name, \
&param_ops_string, \
.str = &__param_string_##name, perm, -1); \
.str = &__param_string_##name, perm, -1, 0);\
__MODULE_PARM_TYPE(name, "string")
/**
@@ -444,7 +472,7 @@ extern int param_set_bint(const char *val, const struct kernel_param *kp);
__module_param_call(MODULE_PARAM_PREFIX, name, \
&param_array_ops, \
.arr = &__param_arr_##name, \
perm, -1); \
perm, -1, 0); \
__MODULE_PARM_TYPE(name, "array of " #type)
extern struct kernel_param_ops param_array_ops;