linux-kernel - [PATCH] cxl/port: Constify 'struct bin

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Message-Id: <20250114-sysfs-const-bin_attr-cxl-v1-1-5afa23fe2a52@weissschuh.net>
Date: Tue, 14 Jan 2025 22:25:14 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Davidlohr Bueso <dave@...olabs.net>, 
 Jonathan Cameron <jonathan.cameron@...wei.com>, 
 Dave Jiang <dave.jiang@...el.com>, 
 Alison Schofield <alison.schofield@...el.com>, 
 Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>, 
 Dan Williams <dan.j.williams@...el.com>
Cc: linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] cxl/port: Constify 'struct bin_attribute'

The sysfs core now allows instances of 'struct bin_attribute' to be
moved into read-only memory. Make use of that to protect them against
accidental or malicious modifications.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/cxl/port.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c
index 4c83f6a22e584f1f248807c7fa4fe932d6f11d67..664fde6ff53862c6aef2a83be56c1518b6bfbadd 100644
--- a/drivers/cxl/port.c
+++ b/drivers/cxl/port.c
@@ -153,7 +153,7 @@ static int cxl_port_probe(struct device *dev)
 }
 
 static ssize_t CDAT_read(struct file *filp, struct kobject *kobj,
-			 struct bin_attribute *bin_attr, char *buf,
+			 const struct bin_attribute *bin_attr, char *buf,
 			 loff_t offset, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -170,7 +170,7 @@ static ssize_t CDAT_read(struct file *filp, struct kobject *kobj,
 				       port->cdat.length);
 }
 
-static BIN_ATTR_ADMIN_RO(CDAT, 0);
+static const BIN_ATTR_ADMIN_RO(CDAT, 0);
 
 static umode_t cxl_port_bin_attr_is_visible(struct kobject *kobj,
 					    const struct bin_attribute *attr, int i)
@@ -184,13 +184,13 @@ static umode_t cxl_port_bin_attr_is_visible(struct kobject *kobj,
 	return 0;
 }
 
-static struct bin_attribute *cxl_cdat_bin_attributes[] = {
+static const struct bin_attribute *const cxl_cdat_bin_attributes[] = {
 	&bin_attr_CDAT,
 	NULL,
 };
 
-static struct attribute_group cxl_cdat_attribute_group = {
-	.bin_attrs = cxl_cdat_bin_attributes,
+static const struct attribute_group cxl_cdat_attribute_group = {
+	.bin_attrs_new = cxl_cdat_bin_attributes,
 	.is_bin_visible = cxl_port_bin_attr_is_visible,
 };
 

---
base-commit: 7f5b6a8ec18e3add4c74682f60b90c31bdf849f2
change-id: 20250114-sysfs-const-bin_attr-cxl-d102eab47586

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>