debug_pagetables.c (1ac731c529cd4d6adbce134754b51ff7d822b145) debug_pagetables.c (ea4654e0885348f0faa47f6d7b44a08d75ad16e9)
1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/debugfs.h>
3#include <linux/efi.h>
4#include <linux/module.h>
5#include <linux/seq_file.h>
6#include <linux/pgtable.h>
7
8static int ptdump_show(struct seq_file *m, void *v)

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17{
18 if (current->mm->pgd)
19 ptdump_walk_pgd_level_debugfs(m, current->mm, false);
20 return 0;
21}
22
23DEFINE_SHOW_ATTRIBUTE(ptdump_curknl);
24
1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/debugfs.h>
3#include <linux/efi.h>
4#include <linux/module.h>
5#include <linux/seq_file.h>
6#include <linux/pgtable.h>
7
8static int ptdump_show(struct seq_file *m, void *v)

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17{
18 if (current->mm->pgd)
19 ptdump_walk_pgd_level_debugfs(m, current->mm, false);
20 return 0;
21}
22
23DEFINE_SHOW_ATTRIBUTE(ptdump_curknl);
24
25#ifdef CONFIG_PAGE_TABLE_ISOLATION
25#ifdef CONFIG_MITIGATION_PAGE_TABLE_ISOLATION
26static int ptdump_curusr_show(struct seq_file *m, void *v)
27{
28 if (current->mm->pgd)
29 ptdump_walk_pgd_level_debugfs(m, current->mm, true);
30 return 0;
31}
32
33DEFINE_SHOW_ATTRIBUTE(ptdump_curusr);

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49static int __init pt_dump_debug_init(void)
50{
51 dir = debugfs_create_dir("page_tables", NULL);
52
53 debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
54 debugfs_create_file("current_kernel", 0400, dir, NULL,
55 &ptdump_curknl_fops);
56
26static int ptdump_curusr_show(struct seq_file *m, void *v)
27{
28 if (current->mm->pgd)
29 ptdump_walk_pgd_level_debugfs(m, current->mm, true);
30 return 0;
31}
32
33DEFINE_SHOW_ATTRIBUTE(ptdump_curusr);

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49static int __init pt_dump_debug_init(void)
50{
51 dir = debugfs_create_dir("page_tables", NULL);
52
53 debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
54 debugfs_create_file("current_kernel", 0400, dir, NULL,
55 &ptdump_curknl_fops);
56
57#ifdef CONFIG_PAGE_TABLE_ISOLATION
57#ifdef CONFIG_MITIGATION_PAGE_TABLE_ISOLATION
58 debugfs_create_file("current_user", 0400, dir, NULL,
59 &ptdump_curusr_fops);
60#endif
61#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
62 debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
63#endif
64 return 0;
65}
66
67static void __exit pt_dump_debug_exit(void)
68{
69 debugfs_remove_recursive(dir);
70}
71
72module_init(pt_dump_debug_init);
73module_exit(pt_dump_debug_exit);
74MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
75MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");
58 debugfs_create_file("current_user", 0400, dir, NULL,
59 &ptdump_curusr_fops);
60#endif
61#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
62 debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
63#endif
64 return 0;
65}
66
67static void __exit pt_dump_debug_exit(void)
68{
69 debugfs_remove_recursive(dir);
70}
71
72module_init(pt_dump_debug_init);
73module_exit(pt_dump_debug_exit);
74MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
75MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables");