linux-kernel - [PATCH 1/4] firmware: google: cbmem: Constify 'struct bin

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Message-Id: <20241215-sysfs-const-bin_attr-google-v1-1-e5c2808f5833@weissschuh.net>
Date: Sun, 15 Dec 2024 15:49:09 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Tzung-Bi Shih <tzungbi@...nel.org>, 
 Brian Norris <briannorris@...omium.org>, 
 Julius Werner <jwerner@...omium.org>
Cc: chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 1/4] firmware: google: cbmem: 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/firmware/google/cbmem.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/google/cbmem.c b/drivers/firmware/google/cbmem.c
index 66042160b361fe2a2d9599880a96d5de14b7128d..773d05078e0ae0763591a6d9cfa0d55ea5fff611 100644
--- a/drivers/firmware/google/cbmem.c
+++ b/drivers/firmware/google/cbmem.c
@@ -30,7 +30,7 @@ static struct cbmem_entry *to_cbmem_entry(struct kobject *kobj)
 }
 
 static ssize_t mem_read(struct file *filp, struct kobject *kobj,
-			struct bin_attribute *bin_attr, char *buf, loff_t pos,
+			const struct bin_attribute *bin_attr, char *buf, loff_t pos,
 			size_t count)
 {
 	struct cbmem_entry *entry = to_cbmem_entry(kobj);
@@ -40,7 +40,7 @@ static ssize_t mem_read(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t mem_write(struct file *filp, struct kobject *kobj,
-			 struct bin_attribute *bin_attr, char *buf, loff_t pos,
+			 const struct bin_attribute *bin_attr, char *buf, loff_t pos,
 			 size_t count)
 {
 	struct cbmem_entry *entry = to_cbmem_entry(kobj);
@@ -53,7 +53,7 @@ static ssize_t mem_write(struct file *filp, struct kobject *kobj,
 	memcpy(entry->mem_file_buf + pos, buf, count);
 	return count;
 }
-static BIN_ATTR_ADMIN_RW(mem, 0);
+static const BIN_ATTR_ADMIN_RW(mem, 0);
 
 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 			    char *buf)
@@ -79,14 +79,14 @@ static struct attribute *attrs[] = {
 	NULL,
 };
 
-static struct bin_attribute *bin_attrs[] = {
+static const struct bin_attribute *const bin_attrs[] = {
 	&bin_attr_mem,
 	NULL,
 };
 
 static const struct attribute_group cbmem_entry_group = {
 	.attrs = attrs,
-	.bin_attrs = bin_attrs,
+	.bin_attrs_new = bin_attrs,
 };
 
 static const struct attribute_group *dev_groups[] = {

-- 
2.47.1