From 9bd6dcb8ccb1a7d18534a88ff0d11e466a3a98a4 Mon Sep 17 00:00:00 2001 From: Daniel Starke Date: Mon, 6 Feb 2023 12:46:03 +0100 Subject: [PATCH] tty: n_gsm: mark unusable ioctl structure fields accordingly gsm_config and gsm_netconfig includes unused fields that have been included to allow future extension without changing the structure size. Unfortunately, no checks have been included for these field. The actual value set by old user space code remains undefined. This means that future extensions can not use these fields without breaking old user space code which may set unexpected values. Mark these fields accordingly to avoid breaking code changes. Signed-off-by: Daniel Starke Link: https://lore.kernel.org/r/20230206114606.2133-1-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman --- include/uapi/linux/gsmmux.h | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/include/uapi/linux/gsmmux.h b/include/uapi/linux/gsmmux.h index cb8693b39cb74..785d6b253f6d9 100644 --- a/include/uapi/linux/gsmmux.h +++ b/include/uapi/linux/gsmmux.h @@ -19,8 +19,7 @@ struct gsm_config unsigned int mtu; unsigned int k; unsigned int i; - unsigned int unused[8]; /* Padding for expansion without - breaking stuff */ + unsigned int unused[8]; /* Can not be used */ }; #define GSMIOC_GETCONF _IOR('G', 0, struct gsm_config) @@ -29,9 +28,9 @@ struct gsm_config struct gsm_netconfig { unsigned int adaption; /* Adaption to use in network mode */ unsigned short protocol;/* Protocol to use - only ETH_P_IP supported */ - unsigned short unused2; + unsigned short unused2; /* Can not be used */ char if_name[IFNAMSIZ]; /* interface name format string */ - __u8 unused[28]; /* For future use */ + __u8 unused[28]; /* Can not be used */ }; #define GSMIOC_ENABLE_NET _IOW('G', 2, struct gsm_netconfig) -- 2.30.2