linux-kernel - [PATCH v2 2/3] mm/hwpoison: change permission of corrupt-pfn/unpoison-pfn to 0200

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Date:	Tue, 27 Aug 2013 10:39:30 +0800
From:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andi Kleen <andi@...stfloor.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Tony Luck <tony.luck@...el.com>, gong.chen@...ux.intel.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: [PATCH v2 2/3] 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.

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
---
 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..afc2daa 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

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