linux-hardening - [PATCH v2 04/18] cgroup: bpf: constify ctl

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Message-Id: <20231204-const-sysctl-v2-4-7a5060b11447@weissschuh.net>
Date: Mon, 04 Dec 2023 08:52:17 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Kees Cook <keescook@...omium.org>, 
 "Gustavo A. R. Silva" <gustavoars@...nel.org>, 
 Luis Chamberlain <mcgrof@...nel.org>, Iurii Zaikin <yzaikin@...gle.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Joel Granados <j.granados@...sung.com>
Cc: linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-fsdevel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH v2 04/18] cgroup: bpf: constify ctl_table arguments and
 fields

In a future commit the sysctl core will only use
"const struct ctl_table". As a preparation for that adapt the cgroup-bpf
code.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 include/linux/bpf-cgroup.h | 2 +-
 include/linux/filter.h     | 2 +-
 kernel/bpf/cgroup.c        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/bpf-cgroup.h b/include/linux/bpf-cgroup.h
index a789266feac3..504fe9f8a3e7 100644
--- a/include/linux/bpf-cgroup.h
+++ b/include/linux/bpf-cgroup.h
@@ -138,7 +138,7 @@ int __cgroup_bpf_check_dev_permission(short dev_type, u32 major, u32 minor,
 				      short access, enum cgroup_bpf_attach_type atype);

 int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
-				   struct ctl_table *table, int write,
+				   const struct ctl_table *table, int write,
 				   char **buf, size_t *pcount, loff_t *ppos,
 				   enum cgroup_bpf_attach_type atype);

diff --git a/include/linux/filter.h b/include/linux/filter.h
index a4953fafc8cb..4d035fbd8558 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -1358,7 +1358,7 @@ struct bpf_sock_ops_kern {

 struct bpf_sysctl_kern {
 	struct ctl_table_header *head;
-	struct ctl_table *table;
+	const struct ctl_table *table;
 	void *cur_val;
 	size_t cur_len;
 	void *new_val;
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index 491d20038cbe..85476970b487 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1694,7 +1694,7 @@ const struct bpf_verifier_ops cg_dev_verifier_ops = {
  * returned value != 1 during execution. In all other cases 0 is returned.
  */
 int __cgroup_bpf_run_filter_sysctl(struct ctl_table_header *head,
-				   struct ctl_table *table, int write,
+				   const struct ctl_table *table, int write,
 				   char **buf, size_t *pcount, loff_t *ppos,
 				   enum cgroup_bpf_attach_type atype)
 {

-- 
2.43.0