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

[tip-bot for Borislav Petkov]

Commit-ID:  071ac0c4e8e90d5de05f0779b03ae69ce84820d5
Gitweb:     http://git.kernel.org/tip/071ac0c4e8e90d5de05f0779b03ae69ce84820d5
Author:     Borislav Petkov <bp@xxxxxxx>
AuthorDate: Mon, 30 Nov 2015 13:12:59 +0100
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Fri, 4 Dec 2015 12:55:01 +0100

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 <bp@xxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1448885579-32506-1-git-send-email-bp@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/mm/debug_pagetables.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/debug_pagetables.c b/arch/x86/mm/debug_pagetables.c
index b35ee86..bfcffdf 100644
--- a/arch/x86/mm/debug_pagetables.c
+++ b/arch/x86/mm/debug_pagetables.c
@@ -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;
--
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