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block/rnbd: Constify struct kobj_type

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'struct kobj_type' is not modified in this driver. It is only used with
kobject_init_and_add() which takes a "const struct kobj_type *" parameter.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig, as an example:
Before:
======
   text	   data	    bss	    dec	    hex	filename
   4082	    792	      8	   4882	   1312	drivers/block/rnbd/rnbd-srv-sysfs.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
   4210	    672	      8	   4890	   131a	drivers/block/rnbd/rnbd-srv-sysfs.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/e3d454173ffad30726c9351810d3aa7b75122711.1720462252.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christophe JAILLET 2024-07-08 20:11:30 +02:00 committed by Jens Axboe
parent 61353a63a2
commit e4eaca5e30
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/block/rnbd/rnbd-clt-sysfs.c
View File

@ -475,7 +475,7 @@ void rnbd_clt_remove_dev_symlink(struct rnbd_clt_dev *dev)
}
}
static struct kobj_type rnbd_dev_ktype = {
static const struct kobj_type rnbd_dev_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = rnbd_dev_groups,
};

4
drivers/block/rnbd/rnbd-srv-sysfs.c
View File

@ -33,7 +33,7 @@ static void rnbd_srv_dev_release(struct kobject *kobj)
kfree(dev);
}
static struct kobj_type dev_ktype = {
static const struct kobj_type dev_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.release = rnbd_srv_dev_release
};
@ -184,7 +184,7 @@ static void rnbd_srv_sess_dev_release(struct kobject *kobj)
rnbd_destroy_sess_dev(sess_dev, sess_dev->keep_id);
}
static struct kobj_type rnbd_srv_sess_dev_ktype = {
static const struct kobj_type rnbd_srv_sess_dev_ktype = {
.sysfs_ops = &kobj_sysfs_ops,
.release = rnbd_srv_sess_dev_release,
};