57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
/*
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* Procedures for exposing kaslr debugging information.
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*
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* Jia Ma, Samsung Research America, Sep 2015
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* Copyright (C) 2015 Jia Ma.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#if defined(CONFIG_DEBUG_FS)
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static int kaslr_debug_show(struct seq_file *m, void *private){
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extern u64 *__boot_kernel_offset;
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u64 *kernel_addr = (u64 *) &__boot_kernel_offset;
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seq_printf(m, "0x%016llx..0x%016llx..\n",
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(kernel_addr[0]+kernel_addr[1]),
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kernel_addr[1]+kernel_addr[0]-kernel_addr[2]);
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return 0 ;
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}
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static int kaslr_debug_open(struct inode *inode, struct file *file)
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{
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return single_open(file, kaslr_debug_show, inode->i_private);
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}
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static const struct file_operations kaslr_debug_fops = {
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.open = kaslr_debug_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init kaslr_init_debugfs(void)
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{
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struct dentry *root = debugfs_create_dir("kaslr", NULL);
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if (!root)
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return -ENXIO;
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debugfs_create_file("kaslr", S_IRUSR, root, NULL , &kaslr_debug_fops);
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return 0;
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}
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__initcall(kaslr_init_debugfs);
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#endif /*CONFIG_DEBUG_FS*/
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