x86/mm/ptdump: Make (debugfs)/kernel_page_tables read-only

File should be created with S_IRUSR and not with S_IWUSR too
because writing to it doesn't make any sense. I mean, we don't
have a ->write method anyway but let's have the permissions
correct too.

Signed-off-by: Borislav Petkov <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Borislav Petkov 2015-11-30 13:12:59 +01:00 • committed by Ingo Molnar
commit 071ac0c4e8

View file

@ -26,7 +26,7 @@ static struct dentry *pe;
static int __init pt_dump_debug_init(void)
{
pe = debugfs_create_file("kernel_page_tables", 0600, NULL, NULL,
pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL,
&ptdump_fops);
if (!pe)
return -ENOMEM;