luck/tmp_suning_uos_patched
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Merge branches 'for-4.1/upstream-fixes', 'for-4.2/kaslr' and 'for-4.2/upstream' into for-linus

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This commit is contained in:
Jiri Kosina 2015-06-22 16:26:56 +02:00
commit 110c146645
6 changed files with 66 additions and 33 deletions
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1
arch/x86/include/asm/livepatch.h
View File

@ -21,6 +21,7 @@
#ifndef _ASM_X86_LIVEPATCH_H
#define _ASM_X86_LIVEPATCH_H
#include <asm/setup.h>
#include <linux/module.h>
#include <linux/ftrace.h>

7
arch/x86/include/asm/setup.h
View File

@ -60,17 +60,24 @@ static inline void x86_ce4100_early_setup(void) { }
#ifndef _SETUP
#include <asm/espfix.h>
#include <linux/kernel.h>
/*
* This is set up by the setup-routine at boot-time
*/
extern struct boot_params boot_params;
extern char _text[];
static inline bool kaslr_enabled(void)
{
return !!(boot_params.hdr.loadflags & KASLR_FLAG);
}
static inline unsigned long kaslr_offset(void)
{
return (unsigned long)&_text - __START_KERNEL;
}
/*
* Do NOT EVER look at the BIOS memory size location.
* It does not work on many machines.

3
arch/x86/kernel/machine_kexec_64.c
View File

@ -25,6 +25,7 @@
#include <asm/io_apic.h>
#include <asm/debugreg.h>
#include <asm/kexec-bzimage64.h>
#include <asm/setup.h>
#ifdef CONFIG_KEXEC_FILE
static struct kexec_file_ops *kexec_file_loaders[] = {
@ -334,7 +335,7 @@ void arch_crash_save_vmcoreinfo(void)
VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
#endif
vmcoreinfo_append_str("KERNELOFFSET=%lx\n",
(unsigned long)&_text - __START_KERNEL);
kaslr_offset());
}
/* arch-dependent functionality related to kexec file-based syscall */

2
arch/x86/kernel/setup.c
View File

@ -834,7 +834,7 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
{
if (kaslr_enabled()) {
pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
(unsigned long)&_text - __START_KERNEL,
kaslr_offset(),
__START_KERNEL,
__START_KERNEL_map,
MODULES_VADDR-1);

8
include/linux/livepatch.h
View File

@ -99,7 +99,7 @@ struct klp_object {
struct klp_func *funcs;
/* internal */
struct kobject *kobj;
struct kobject kobj;
struct module *mod;
enum klp_state state;
};
@ -123,6 +123,12 @@ struct klp_patch {
enum klp_state state;
};
#define klp_for_each_object(patch, obj) \
for (obj = patch->objs; obj->funcs; obj++)
#define klp_for_each_func(obj, func) \
for (func = obj->funcs; func->old_name; func++)
int klp_register_patch(struct klp_patch *);
int klp_unregister_patch(struct klp_patch *);
int klp_enable_patch(struct klp_patch *);

78
kernel/livepatch/core.c
View File

@ -128,7 +128,7 @@ static bool klp_is_patch_registered(struct klp_patch *patch)
static bool klp_initialized(void)
{
return klp_root_kobj;
return !!klp_root_kobj;
}
struct klp_find_arg {
@ -242,8 +242,9 @@ static int klp_find_verify_func_addr(struct klp_object *obj,
int ret;
#if defined(CONFIG_RANDOMIZE_BASE)
/* KASLR is enabled, disregard old_addr from user */
func->old_addr = 0;
/* If KASLR has been enabled, adjust old_addr accordingly */
if (kaslr_enabled() && func->old_addr)
func->old_addr += kaslr_offset();
#endif
if (!func->old_addr || klp_is_module(obj))
@ -430,7 +431,7 @@ static void klp_disable_object(struct klp_object *obj)
{
struct klp_func *func;
for (func = obj->funcs; func->old_name; func++)
klp_for_each_func(obj, func)
if (func->state == KLP_ENABLED)
klp_disable_func(func);
@ -448,7 +449,7 @@ static int klp_enable_object(struct klp_object *obj)
if (WARN_ON(!klp_is_object_loaded(obj)))
return -EINVAL;
for (func = obj->funcs; func->old_name; func++) {
klp_for_each_func(obj, func) {
ret = klp_enable_func(func);
if (ret) {
klp_disable_object(obj);
@ -471,7 +472,7 @@ static int __klp_disable_patch(struct klp_patch *patch)
pr_notice("disabling patch '%s'\n", patch->mod->name);
for (obj = patch->objs; obj->funcs; obj++) {
klp_for_each_object(patch, obj) {
if (obj->state == KLP_ENABLED)
klp_disable_object(obj);
}
@ -531,7 +532,7 @@ static int __klp_enable_patch(struct klp_patch *patch)
pr_notice("enabling patch '%s'\n", patch->mod->name);
for (obj = patch->objs; obj->funcs; obj++) {
klp_for_each_object(patch, obj) {
if (!klp_is_object_loaded(obj))
continue;
@ -659,6 +660,15 @@ static struct kobj_type klp_ktype_patch = {
.default_attrs = klp_patch_attrs,
};
static void klp_kobj_release_object(struct kobject *kobj)
{
}
static struct kobj_type klp_ktype_object = {
.release = klp_kobj_release_object,
.sysfs_ops = &kobj_sysfs_ops,
};
static void klp_kobj_release_func(struct kobject *kobj)
{
}
@ -688,7 +698,7 @@ static void klp_free_object_loaded(struct klp_object *obj)
obj->mod = NULL;
for (func = obj->funcs; func->old_name; func++)
klp_for_each_func(obj, func)
func->old_addr = 0;
}
@ -703,7 +713,7 @@ static void klp_free_objects_limited(struct klp_patch *patch,
for (obj = patch->objs; obj->funcs && obj != limit; obj++) {
klp_free_funcs_limited(obj, NULL);
kobject_put(obj->kobj);
kobject_put(&obj->kobj);
}
}
@ -721,7 +731,7 @@ static int klp_init_func(struct klp_object *obj, struct klp_func *func)
func->state = KLP_DISABLED;
return kobject_init_and_add(&func->kobj, &klp_ktype_func,
obj->kobj, "%s", func->old_name);
&obj->kobj, "%s", func->old_name);
}
/* parts of the initialization that is done only when the object is loaded */
@ -737,7 +747,7 @@ static int klp_init_object_loaded(struct klp_patch *patch,
return ret;
}
for (func = obj->funcs; func->old_name; func++) {
klp_for_each_func(obj, func) {
ret = klp_find_verify_func_addr(obj, func);
if (ret)
return ret;
@ -761,11 +771,12 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
klp_find_object_module(obj);
name = klp_is_module(obj) ? obj->name : "vmlinux";
obj->kobj = kobject_create_and_add(name, &patch->kobj);
if (!obj->kobj)
return -ENOMEM;
ret = kobject_init_and_add(&obj->kobj, &klp_ktype_object,
&patch->kobj, "%s", name);
if (ret)
return ret;
for (func = obj->funcs; func->old_name; func++) {
klp_for_each_func(obj, func) {
ret = klp_init_func(obj, func);
if (ret)
goto free;
@ -781,7 +792,7 @@ static int klp_init_object(struct klp_patch *patch, struct klp_object *obj)
free:
klp_free_funcs_limited(obj, func);
kobject_put(obj->kobj);
kobject_put(&obj->kobj);
return ret;
}
@ -802,7 +813,7 @@ static int klp_init_patch(struct klp_patch *patch)
if (ret)
goto unlock;
for (obj = patch->objs; obj->funcs; obj++) {
klp_for_each_object(patch, obj) {
ret = klp_init_object(patch, obj);
if (ret)
goto free;
@ -891,7 +902,7 @@ int klp_register_patch(struct klp_patch *patch)
}
EXPORT_SYMBOL_GPL(klp_register_patch);
static void klp_module_notify_coming(struct klp_patch *patch,
static int klp_module_notify_coming(struct klp_patch *patch,
struct klp_object *obj)
{
struct module *pmod = patch->mod;
@ -899,22 +910,23 @@ static void klp_module_notify_coming(struct klp_patch *patch,
int ret;
ret = klp_init_object_loaded(patch, obj);
if (ret)
goto err;
if (ret) {
pr_warn("failed to initialize patch '%s' for module '%s' (%d)\n",
pmod->name, mod->name, ret);
return ret;
}
if (patch->state == KLP_DISABLED)
return;
return 0;
pr_notice("applying patch '%s' to loading module '%s'\n",
pmod->name, mod->name);
ret = klp_enable_object(obj);
if (!ret)
return;
err:
pr_warn("failed to apply patch '%s' to module '%s' (%d)\n",
pmod->name, mod->name, ret);
if (ret)
pr_warn("failed to apply patch '%s' to module '%s' (%d)\n",
pmod->name, mod->name, ret);
return ret;
}
static void klp_module_notify_going(struct klp_patch *patch,
@ -938,6 +950,7 @@ static void klp_module_notify_going(struct klp_patch *patch,
static int klp_module_notify(struct notifier_block *nb, unsigned long action,
void *data)
{
int ret;
struct module *mod = data;
struct klp_patch *patch;
struct klp_object *obj;
@ -957,13 +970,18 @@ static int klp_module_notify(struct notifier_block *nb, unsigned long action,
mod->klp_alive = false;
list_for_each_entry(patch, &klp_patches, list) {
for (obj = patch->objs; obj->funcs; obj++) {
klp_for_each_object(patch, obj) {
if (!klp_is_module(obj) || strcmp(obj->name, mod->name))
continue;
if (action == MODULE_STATE_COMING) {
obj->mod = mod;
klp_module_notify_coming(patch, obj);
ret = klp_module_notify_coming(patch, obj);
if (ret) {
obj->mod = NULL;
pr_warn("patch '%s' is in an inconsistent state!\n",
patch->mod->name);
}
} else /* MODULE_STATE_GOING */
klp_module_notify_going(patch, obj);
@ -981,7 +999,7 @@ static struct notifier_block klp_module_nb = {
.priority = INT_MIN+1, /* called late but before ftrace notifier */
};
static int klp_init(void)
static int __init klp_init(void)
{
int ret;