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authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-07 20:17:38 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-07 20:17:38 -0400
commitbdf428feb225229b1d4715b45bbdad4a934cd89c (patch)
tree9bc47e348c2081fd46c0f7d715780ce294a6953d /include
parenta40a7201a4584a66ab234ba1006472be952f20e0 (diff)
parent184c3fc3f52fb75800deb76deffb70907d1f76ea (diff)
downloadlinux-bdf428feb225229b1d4715b45bbdad4a934cd89c.tar.bz2
Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
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
Diffstat (limited to 'include')
-rw-r--r--include/linux/moduleparam.h50
1 files changed, 39 insertions, 11 deletions
diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 494f99e852da..b43f4752304e 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -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;
@@ -113,6 +123,12 @@ struct kparam_array
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.
* @value: the actual lvalue to alter.
@@ -129,6 +145,14 @@ struct kparam_array
__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.
* @ops: the set & get operations for this parameter.
@@ -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;