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x86/mm/dump_pagetables: Allow dumping current pagetables

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Add two debugfs files which allow to dump the pagetable of the current
task.

current_kernel dumps the regular page table. This is the page table which
is normally shared between kernel and user space. If kernel page table
isolation is enabled this is the kernel space mapping.

If kernel page table isolation is enabled the second file, current_user,
dumps the user space page table.

These files allow to verify the resulting page tables for page table
isolation, but even in the normal case its useful to be able to inspect
user space page tables of current for debugging purposes.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2017-12-04 15:08:06 +01:00 committed by Ingo Molnar
parent b4bf4f924b
commit a4b51ef655
3 changed files with 73 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/pgtable.h
View File

@ -28,7 +28,7 @@ extern pgd_t early_top_pgt[PTRS_PER_PGD];
int __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd);
void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user);
void ptdump_walk_pgd_level_checkwx(void);
#ifdef CONFIG_DEBUG_WX

71
arch/x86/mm/debug_pagetables.c
View File

@ -5,7 +5,7 @@
static int ptdump_show(struct seq_file *m, void *v)
{
ptdump_walk_pgd_level_debugfs(m, NULL);
ptdump_walk_pgd_level_debugfs(m, NULL, false);
return 0;
}
@ -22,7 +22,57 @@ static const struct file_operations ptdump_fops = {
.release = single_release,
};
static struct dentry *dir, *pe;
static int ptdump_show_curknl(struct seq_file *m, void *v)
{
if (current->mm->pgd) {
down_read(&current->mm->mmap_sem);
ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, false);
up_read(&current->mm->mmap_sem);
}
return 0;
}
static int ptdump_open_curknl(struct inode *inode, struct file *filp)
{
return single_open(filp, ptdump_show_curknl, NULL);
}
static const struct file_operations ptdump_curknl_fops = {
.owner = THIS_MODULE,
.open = ptdump_open_curknl,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#ifdef CONFIG_PAGE_TABLE_ISOLATION
static struct dentry *pe_curusr;
static int ptdump_show_curusr(struct seq_file *m, void *v)
{
if (current->mm->pgd) {
down_read(&current->mm->mmap_sem);
ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, true);
up_read(&current->mm->mmap_sem);
}
return 0;
}
static int ptdump_open_curusr(struct inode *inode, struct file *filp)
{
return single_open(filp, ptdump_show_curusr, NULL);
}
static const struct file_operations ptdump_curusr_fops = {
.owner = THIS_MODULE,
.open = ptdump_open_curusr,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#endif
static struct dentry *dir, *pe_knl, *pe_curknl;
static int __init pt_dump_debug_init(void)
{
@ -30,9 +80,22 @@ static int __init pt_dump_debug_init(void)
if (!dir)
return -ENOMEM;
pe = debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops);
if (!pe)
pe_knl = debugfs_create_file("kernel", 0400, dir, NULL,
&ptdump_fops);
if (!pe_knl)
goto err;
pe_curknl = debugfs_create_file("current_kernel", 0400,
dir, NULL, &ptdump_curknl_fops);
if (!pe_curknl)
goto err;
#ifdef CONFIG_PAGE_TABLE_ISOLATION
pe_curusr = debugfs_create_file("current_user", 0400,
dir, NULL, &ptdump_curusr_fops);
if (!pe_curusr)
goto err;
#endif
return 0;
err:
debugfs_remove_recursive(dir);

6
arch/x86/mm/dump_pagetables.c
View File

@ -530,8 +530,12 @@ void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd)
ptdump_walk_pgd_level_core(m, pgd, false, true);
}
void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd)
void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user)
{
#ifdef CONFIG_PAGE_TABLE_ISOLATION
if (user && static_cpu_has(X86_FEATURE_PTI))
pgd = kernel_to_user_pgdp(pgd);
#endif
ptdump_walk_pgd_level_core(m, pgd, false, false);
}
EXPORT_SYMBOL_GPL(ptdump_walk_pgd_level_debugfs);