On 6/17/20 12:34 PM, Greg Kroah-Hartman wrote:
From: Wade Mealing <wmealing@xxxxxxxxxx>
Turns out that the permissions for 0400 really are what we want here,
otherwise any user can write to this file.
Minor confusion on my side:
Did you mean "read from" instead of "write to"?
I.e. only owner may read but not group nor others.
Whereas using CLASS_ATTR_RO would resolve into 0444.
[fixed formatting and made static - gregkh]
Reported-by: Wade Mealing <wmealing@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Fixes: f40609d1591f ("zram: convert remaining CLASS_ATTR() to CLASS_ATTR_RO()")
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1847832
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 6e2ad90b17a3..270dd810be54 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -2021,7 +2021,8 @@ static ssize_t hot_add_show(struct class *class,
return ret;
return scnprintf(buf, PAGE_SIZE, "%d\n", ret);
}
-static CLASS_ATTR_RO(hot_add);
+static struct class_attribute class_attr_hot_add =
+ __ATTR(hot_add, 0400, hot_add_show, NULL);
static ssize_t hot_remove_store(struct class *class,
struct class_attribute *attr,
--
Mit freundlichen Gruessen / Kind regards
Steffen Maier
Linux on IBM Z Development
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