linux-kernel - [PATCH 1/4] module: sysfs: Drop member 'nsections'

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Message-Id: <20241216-sysfs-const-bin_attr-module-v1-1-f81e49e54ce4@weissschuh.net>
Date: Mon, 16 Dec 2024 20:16:41 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Luis Chamberlain <mcgrof@...nel.org>, Petr Pavlu <petr.pavlu@...e.com>, 
 Sami Tolvanen <samitolvanen@...gle.com>, 
 Daniel Gomez <da.gomez@...sung.com>, Kees Cook <kees@...nel.org>, 
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-hardening@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 1/4] module: sysfs: Drop member 'nsections'

The member is only used to iterate over all attributes in
free_sect_attrs(). However the attribute group can already be used for
that. Use the group and drop 'nsections'.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 kernel/module/sysfs.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/kernel/module/sysfs.c b/kernel/module/sysfs.c
index 456358e1fdc43e6b5b24f383bbefa37812971174..b7841f76a933114e6dbd0fc2d32a60b66b7966b6 100644
--- a/kernel/module/sysfs.c
+++ b/kernel/module/sysfs.c
@@ -26,7 +26,6 @@ struct module_sect_attr {

 struct module_sect_attrs {
 	struct attribute_group grp;
-	unsigned int nsections;
 	struct module_sect_attr attrs[];
 };

@@ -62,10 +61,10 @@ static ssize_t module_sect_read(struct file *file, struct kobject *kobj,

 static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
 {
-	unsigned int section;
+	struct bin_attribute **bin_attr;

-	for (section = 0; section < sect_attrs->nsections; section++)
-		kfree(sect_attrs->attrs[section].battr.attr.name);
+	for (bin_attr = sect_attrs->grp.bin_attrs; *bin_attr; bin_attr++)
+		kfree((*bin_attr)->attr.name);
 	kfree(sect_attrs);
 }

@@ -92,7 +91,6 @@ static int add_sect_attrs(struct module *mod, const struct load_info *info)
 	sect_attrs->grp.name = "sections";
 	sect_attrs->grp.bin_attrs = (void *)sect_attrs + size[0];

-	sect_attrs->nsections = 0;
 	sattr = &sect_attrs->attrs[0];
 	gattr = &sect_attrs->grp.bin_attrs[0];
 	for (i = 0; i < info->hdr->e_shnum; i++) {
@@ -108,7 +106,6 @@ static int add_sect_attrs(struct module *mod, const struct load_info *info)
 			ret = -ENOMEM;
 			goto out;
 		}
-		sect_attrs->nsections++;
 		sattr->battr.read = module_sect_read;
 		sattr->battr.size = MODULE_SECT_READ_SIZE;
 		sattr->battr.attr.mode = 0400;

-- 
2.47.1