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misc: sram: constify 'struct bin_attribute'

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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>
Link: https://lore.kernel.org/r/20241221-sysfs-const-bin_attr-misc-drivers-v2-3-ba5e79fe8771@weissschuh.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Weißschuh 2024-12-21 15:48:09 +01:00 • committed by Greg Kroah-Hartman
parent e47e0e7ed0
commit c3b8c358c4
1 changed files with 4 additions and 4 deletions
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8
drivers/misc/sram.c
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@ -23,7 +23,7 @@
#define SRAM_GRANULARITY 32 #define SRAM_GRANULARITY 32
static ssize_t sram_read(struct file *filp, struct kobject *kobj, static ssize_t sram_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, const struct bin_attribute *attr,
char *buf, loff_t pos, size_t count) char *buf, loff_t pos, size_t count)
{ {
struct sram_partition *part; struct sram_partition *part;
@ -38,7 +38,7 @@ static ssize_t sram_read(struct file *filp, struct kobject *kobj,
} }
static ssize_t sram_write(struct file *filp, struct kobject *kobj, static ssize_t sram_write(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, const struct bin_attribute *attr,
char *buf, loff_t pos, size_t count) char *buf, loff_t pos, size_t count)
{ {
struct sram_partition *part; struct sram_partition *part;
@ -83,8 +83,8 @@ static int sram_add_export(struct sram_dev *sram, struct sram_reserve *block,
return -ENOMEM; return -ENOMEM;
part->battr.attr.mode = S_IRUSR | S_IWUSR; part->battr.attr.mode = S_IRUSR | S_IWUSR;
part->battr.read = sram_read; part->battr.read_new = sram_read;
part->battr.write = sram_write; part->battr.write_new = sram_write;
part->battr.size = block->size; part->battr.size = block->size;
return device_create_bin_file(sram->dev, &part->battr); return device_create_bin_file(sram->dev, &part->battr);