linux-kernel - [PATCH] Revert "zram: convert remaining CLASS_ATTR() to CLASS_ATTR

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Date:   Wed, 17 Jun 2020 12:34:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wade Mealing <wmealing@...hat.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH] Revert "zram: convert remaining CLASS_ATTR() to
 CLASS_ATTR_RO()"

From: Wade Mealing <wmealing@...hat.com>

Turns out that the permissions for 0400 really are what we want here,
otherwise any user can write to this file.

[fixed formatting and made static - gregkh]

Reported-by: Wade Mealing <wmealing@...hat.com>
Cc: stable <stable@...r.kernel.org>
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@...uxfoundation.org>
---
 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,
-- 
2.27.0