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From:   ira.weiny@intel.com
To:     Dan Williams <dan.j.williams@intel.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc:     Ira Weiny <ira.weiny@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Lukas Wunner <lukas@wunner.de>,
        Alison Schofield <alison.schofield@intel.com>,
        Vishal Verma <vishal.l.verma@intel.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Ben Widawsky <bwidawsk@kernel.org>,
        linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org,
        linux-pci@vger.kernel.org
Subject: [PATCH V12 5/9] driver-core: Introduce BIN_ATTR_ADMIN_{RO,RW}
Date:   Mon, 27 Jun 2022 21:15:23 -0700
Message-Id: <20220628041527.742333-6-ira.weiny@intel.com>
In-Reply-To: <20220628041527.742333-1-ira.weiny@intel.com>
References: <20220628041527.742333-1-ira.weiny@intel.com>
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From: Ira Weiny <ira.weiny@intel.com>

Many binary attributes need to limit access to CAP_SYS_ADMIN only; ie
many binary attributes specify is_visible with 0400 or 0600.

Make setting the permissions of such attributes more explicit by
defining BIN_ATTR_ADMIN_{RO,RW}.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

---
Changes from V11:
	New Patch
---
 include/linux/sysfs.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index e3f1e8ac1f85..fd3fe5c8c17f 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -235,6 +235,22 @@ struct bin_attribute bin_attr_##_name = __BIN_ATTR_WO(_name, _size)
 #define BIN_ATTR_RW(_name, _size)					\
 struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size)
 
+
+#define __BIN_ATTR_ADMIN_RO(_name, _size) {					\
+	.attr	= { .name = __stringify(_name), .mode = 0400 },		\
+	.read	= _name##_read,						\
+	.size	= _size,						\
+}
+
+#define __BIN_ATTR_ADMIN_RW(_name, _size)					\
+	__BIN_ATTR(_name, 0600, _name##_read, _name##_write, _size)
+
+#define BIN_ATTR_ADMIN_RO(_name, _size)					\
+struct bin_attribute bin_attr_##_name = __BIN_ATTR_ADMIN_RO(_name, _size)
+
+#define BIN_ATTR_ADMIN_RW(_name, _size)					\
+struct bin_attribute bin_attr_##_name = __BIN_ATTR_ADMIN_RW(_name, _size)
+
 struct sysfs_ops {
 	ssize_t	(*show)(struct kobject *, struct attribute *, char *);
 	ssize_t	(*store)(struct kobject *, struct attribute *, const char *, size_t);
-- 
2.35.3