mm/hwpoison-inject.c: change permission of corrupt-pfn/unpoison-pfn to 0200

Hwpoison injection 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 changes the permission of corrupt-pfn/unpoison-pfn to 0200.

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index 3a61efc518d56964460af63ca31ba26bc375ad47..afc2daa91c609dd8aab70f50fb58fd9100ed8326 100644 (file)
--- 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;