diff options
Diffstat (limited to 'arch/x86/mm/debug_pagetables.c')
| -rw-r--r-- | arch/x86/mm/debug_pagetables.c | 65 |
1 files changed, 47 insertions, 18 deletions
diff --git a/arch/x86/mm/debug_pagetables.c b/arch/x86/mm/debug_pagetables.c index bfcffdf6c577..ae5c213a1cb0 100644 --- a/arch/x86/mm/debug_pagetables.c +++ b/arch/x86/mm/debug_pagetables.c @@ -1,46 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0-only #include <linux/debugfs.h> +#include <linux/efi.h> #include <linux/module.h> #include <linux/seq_file.h> -#include <asm/pgtable.h> +#include <linux/pgtable.h> static int ptdump_show(struct seq_file *m, void *v) { - ptdump_walk_pgd_level(m, NULL); + ptdump_walk_pgd_level_debugfs(m, &init_mm, false); return 0; } -static int ptdump_open(struct inode *inode, struct file *filp) +DEFINE_SHOW_ATTRIBUTE(ptdump); + +static int ptdump_curknl_show(struct seq_file *m, void *v) { - return single_open(filp, ptdump_show, NULL); + if (current->mm->pgd) + ptdump_walk_pgd_level_debugfs(m, current->mm, false); + return 0; } -static const struct file_operations ptdump_fops = { - .owner = THIS_MODULE, - .open = ptdump_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; +DEFINE_SHOW_ATTRIBUTE(ptdump_curknl); -static struct dentry *pe; +#ifdef CONFIG_MITIGATION_PAGE_TABLE_ISOLATION +static int ptdump_curusr_show(struct seq_file *m, void *v) +{ + if (current->mm->pgd) + ptdump_walk_pgd_level_debugfs(m, current->mm, true); + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(ptdump_curusr); +#endif + +#if defined(CONFIG_EFI) && defined(CONFIG_X86_64) +static int ptdump_efi_show(struct seq_file *m, void *v) +{ + if (efi_mm.pgd) + ptdump_walk_pgd_level_debugfs(m, &efi_mm, false); + return 0; +} + +DEFINE_SHOW_ATTRIBUTE(ptdump_efi); +#endif + +static struct dentry *dir; static int __init pt_dump_debug_init(void) { - pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL, - &ptdump_fops); - if (!pe) - return -ENOMEM; + dir = debugfs_create_dir("page_tables", NULL); + + debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops); + debugfs_create_file("current_kernel", 0400, dir, NULL, + &ptdump_curknl_fops); +#ifdef CONFIG_MITIGATION_PAGE_TABLE_ISOLATION + debugfs_create_file("current_user", 0400, dir, NULL, + &ptdump_curusr_fops); +#endif +#if defined(CONFIG_EFI) && defined(CONFIG_X86_64) + debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops); +#endif return 0; } static void __exit pt_dump_debug_exit(void) { - debugfs_remove_recursive(pe); + debugfs_remove_recursive(dir); } module_init(pt_dump_debug_init); module_exit(pt_dump_debug_exit); -MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>"); MODULE_DESCRIPTION("Kernel debugging helper that dumps pagetables"); |