From: Thomas Weißschuh <linux@weissschuh.net>
Date: Sun, 15 Dec 2024 14:49:09 +0000 (+0100)
Subject: firmware: google: cbmem: Constify 'struct bin_attribute'
X-Git-Tag: block-6.14-20240131~35^2~3
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=bf2066caee80c1612cb5a3356dc16a7a298f58ab;p=linux-block.git

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@weissschuh.net>
Acked-by: Brian Norris <briannorris@chromium.org>
Link: https://lore.kernel.org/r/20241215-sysfs-const-bin_attr-google-v1-1-e5c2808f5833@weissschuh.net
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---

diff --git a/drivers/firmware/google/cbmem.c b/drivers/firmware/google/cbmem.c
index 66042160b361..773d05078e0a 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[] = {