On Mon, Aug 26, 2013 at 04:46:13PM +0800, Wanpeng Li wrote:
>Hwpoison inject doesn't implement read method for corrupt-pfn/unpoison-pfn
>attributes:
>
># cat /sys/kernel/debug/hwpoison/corrupt-pfn
>cat: /sys/kernel/debug/hwpoison/corrupt-pfn: Permission denied
># cat /sys/kernel/debug/hwpoison/unpoison-pfn
>cat: /sys/kernel/debug/hwpoison/unpoison-pfn: Permission denied
>
>This patch change the permission of corrupt-pfn/unpoison-pfn to 0400.
>
>Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
>---
> mm/hwpoison-inject.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
>diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
>index 3a61efc..8b77bfd 100644
>--- a/mm/hwpoison-inject.c
>+++ b/mm/hwpoison-inject.c
>@@ -88,12 +88,12 @@ static int pfn_inject_init(void)
> * hardware status change, hence do not require hardware support.
> * They are mainly for testing hwpoison in software level.
> */
>- dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
>+ dentry = debugfs_create_file("corrupt-pfn", 0400, hwpoison_dir,
> NULL, &hwpoison_fops);
> if (!dentry)
> goto fail;
>
>- dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir,
>+ dentry = debugfs_create_file("unpoison-pfn", 0400, hwpoison_dir,
> NULL, &unpoison_fops);
> if (!dentry)
> goto fail;
>--
>1.8.1.2
Fix this patch:
>From 615b965ad33e4a18a8b977243024ef5911d2272c Mon Sep 17 00:00:00 2001
From: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Date: Mon, 26 Aug 2013 11:44:50 +0800
Subject: [PATCH v4 9/10] mm/hwpoison: change permission of corrupt-pfn/unpoison-pfn to 0200
Hwpoison inject doesn't implement read method for corrupt-pfn/unpoison-pfn
attributes:
# cat /sys/kernel/debug/hwpoison/corrupt-pfn
cat: /sys/kernel/debug/hwpoison/corrupt-pfn: Permission denied
# cat /sys/kernel/debug/hwpoison/unpoison-pfn
cat: /sys/kernel/debug/hwpoison/unpoison-pfn: Permission denied
This patch change the permission of corrupt-pfn/unpoison-pfn to 0200.
Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
---
mm/hwpoison-inject.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index 3a61efc..8b77bfd 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c
@@ -88,12 +88,12 @@ static int pfn_inject_init(void)
* hardware status change, hence do not require hardware support.
* They are mainly for testing hwpoison in software level.
*/
- dentry = debugfs_create_file("corrupt-pfn", 0600, hwpoison_dir,
+ dentry = debugfs_create_file("corrupt-pfn", 0200, hwpoison_dir,
NULL, &hwpoison_fops);
if (!dentry)
goto fail;
- dentry = debugfs_create_file("unpoison-pfn", 0600, hwpoison_dir,
+ dentry = debugfs_create_file("unpoison-pfn", 0200, hwpoison_dir,
NULL, &unpoison_fops);
if (!dentry)
goto fail;
--
1.8.1.2