169 lines
3.5 KiB
C
169 lines
3.5 KiB
C
|
/*
|
||
|
|
* Huawei KASLR debugfs interface
|
||
|
|
*
|
||
|
|
* Copyright (c) 2017 Huawei.
|
||
|
|
*
|
||
|
|
* Authors:
|
||
|
|
* Weilai Zhou <zhouweilai@huawei.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/seq_file.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
#include <linux/ctype.h>
|
||
|
|
#include <linux/debugfs.h>
|
||
|
|
|
||
|
|
#include <asm/memory.h>
|
||
|
|
#include <asm/module.h>
|
||
|
|
#include <asm/sections.h>
|
||
|
|
|
||
|
|
static struct dentry *kaslr_root;
|
||
|
|
|
||
|
|
#ifdef CONFIG_RANDOMIZE_BASE
|
||
|
|
static u64 img_offset;
|
||
|
|
static u16 linear_seed;
|
||
|
|
extern u16 __initdata memstart_offset_seed;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define KASLR_DEBUG_ENTRY(name) \
|
||
|
|
static int kaslr_##name##_open(struct inode *inode, struct file *file) \
|
||
|
|
{ \
|
||
|
|
return single_open(file, kaslr_##name##_show, inode->i_private); \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
static const struct file_operations kaslr_##name##_fops = { \
|
||
|
|
.owner = THIS_MODULE, \
|
||
|
|
.open = kaslr_##name##_open, \
|
||
|
|
.read = seq_read, \
|
||
|
|
.llseek = seq_lseek, \
|
||
|
|
.release = single_release, \
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_HUAWEI_KERNEL_STACK_RANDOMIZE
|
||
|
|
static int kaslr_kstack_offset_show(struct seq_file *m, void *v)
|
||
|
|
{
|
||
|
|
seq_printf(m, "0x%x\n", kstack_offset);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_HUAWEI_KERNEL_STACK_RANDOMIZE_STRONG
|
||
|
|
static int kaslr_kti_offset_show(struct seq_file *m, void *v)
|
||
|
|
{
|
||
|
|
seq_printf(m, "0x%lx\n", kti_offset);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_RANDOMIZE_BASE
|
||
|
|
static int kaslr_img_offset_show(struct seq_file *m, void *v)
|
||
|
|
{
|
||
|
|
seq_printf(m, "0x%llx\n", img_offset);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kaslr_module_offset_show(struct seq_file *m, void *v)
|
||
|
|
{
|
||
|
|
u64 module_offset, original_base;
|
||
|
|
|
||
|
|
if (IS_ENABLED(CONFIG_RANDOMIZE_MODULE_REGION_FULL))
|
||
|
|
original_base = VMALLOC_START;
|
||
|
|
else
|
||
|
|
original_base = (u64)_etext - MODULES_VSIZE;
|
||
|
|
|
||
|
|
module_offset = module_alloc_base - original_base;
|
||
|
|
seq_printf(m, "0x%llx\n", module_offset);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kaslr_linear_seed_show(struct seq_file *m, void *v)
|
||
|
|
{
|
||
|
|
seq_printf(m, "0x%x\n", linear_seed);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_HUAWEI_KERNEL_STACK_RANDOMIZE
|
||
|
|
KASLR_DEBUG_ENTRY(kstack_offset);
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_HUAWEI_KERNEL_STACK_RANDOMIZE_STRONG
|
||
|
|
KASLR_DEBUG_ENTRY(kti_offset);
|
||
|
|
#endif
|
||
|
|
#ifdef CONFIG_RANDOMIZE_BASE
|
||
|
|
KASLR_DEBUG_ENTRY(img_offset);
|
||
|
|
KASLR_DEBUG_ENTRY(module_offset);
|
||
|
|
KASLR_DEBUG_ENTRY(linear_seed);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static int __init hw_kaslr_debugfs_init(void)
|
||
|
|
{
|
||
|
|
/*create sys/kernel/debug/kaslr for debugfs*/
|
||
|
|
kaslr_root = debugfs_create_dir("kaslr", NULL);
|
||
|
|
if (!kaslr_root)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
#ifdef CONFIG_HUAWEI_KERNEL_STACK_RANDOMIZE
|
||
|
|
debugfs_create_file("kstack_offset",
|
||
|
|
S_IRUGO,
|
||
|
|
kaslr_root,
|
||
|
|
NULL,
|
||
|
|
&kaslr_kstack_offset_fops);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_HUAWEI_KERNEL_STACK_RANDOMIZE_STRONG
|
||
|
|
debugfs_create_file("kti_offset",
|
||
|
|
S_IRUGO,
|
||
|
|
kaslr_root,
|
||
|
|
NULL,
|
||
|
|
&kaslr_kti_offset_fops);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_RANDOMIZE_BASE
|
||
|
|
debugfs_create_file("img_offset",
|
||
|
|
S_IRUGO,
|
||
|
|
kaslr_root,
|
||
|
|
NULL,
|
||
|
|
&kaslr_img_offset_fops);
|
||
|
|
|
||
|
|
debugfs_create_file("module_offset",
|
||
|
|
S_IRUGO,
|
||
|
|
kaslr_root,
|
||
|
|
NULL,
|
||
|
|
&kaslr_module_offset_fops);
|
||
|
|
|
||
|
|
debugfs_create_file("linear_seed",
|
||
|
|
S_IRUGO,
|
||
|
|
kaslr_root,
|
||
|
|
NULL,
|
||
|
|
&kaslr_linear_seed_fops);
|
||
|
|
|
||
|
|
img_offset = kimage_vaddr - KIMAGE_VADDR;
|
||
|
|
linear_seed = memstart_offset_seed;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit hw_kaslr_debugfs_exit(void)
|
||
|
|
{
|
||
|
|
debugfs_remove(kaslr_root);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(hw_kaslr_debugfs_init);
|
||
|
|
module_exit(hw_kaslr_debugfs_exit);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("Huawei KASLR debugfs");
|