linux-hardening - [PATCH] seccomp: Constify sysctl subhelpers

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Date: Wed,  8 May 2024 10:13:41 -0700
From: Kees Cook <keescook@...omium.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Kees Cook <keescook@...omium.org>,
	Joel Granados <j.granados@...sung.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] seccomp: Constify sysctl subhelpers

The read_actions_logged() and write_actions_logged() helpers called by the
sysctl proc handler seccomp_actions_logged_handler() are already expecting
their sysctl table argument to be read-only. Actually mark the argument
as const in preparation[1] for global constification of the sysctl tables.

Suggested-by: "Thomas Weißschuh" <linux@...ssschuh.net>
Link: https://lore.kernel.org/lkml/20240423-sysctl-const-handler-v3-11-e0beccb836e2@weissschuh.net/ [1]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: "Thomas Weißschuh" <linux@...ssschuh.net>
Cc: Joel Granados <j.granados@...sung.com>
Cc: Luis Chamberlain <mcgrof@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Will Drewry <wad@...omium.org>
---
 kernel/seccomp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index aca7b437882e..f70e031e06a8 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -2334,7 +2334,7 @@ static bool seccomp_actions_logged_from_names(u32 *actions_logged, char *names)
 	return true;
 }
 
-static int read_actions_logged(struct ctl_table *ro_table, void *buffer,
+static int read_actions_logged(const struct ctl_table *ro_table, void *buffer,
 			       size_t *lenp, loff_t *ppos)
 {
 	char names[sizeof(seccomp_actions_avail)];
@@ -2352,7 +2352,7 @@ static int read_actions_logged(struct ctl_table *ro_table, void *buffer,
 	return proc_dostring(&table, 0, buffer, lenp, ppos);
 }
 
-static int write_actions_logged(struct ctl_table *ro_table, void *buffer,
+static int write_actions_logged(const struct ctl_table *ro_table, void *buffer,
 				size_t *lenp, loff_t *ppos, u32 *actions_logged)
 {
 	char names[sizeof(seccomp_actions_avail)];
-- 
2.34.1