From a952abcdaa22116d940ca9cb9253caad1622ae93 Mon Sep 17 00:00:00 2001 From: Justin Stitt Date: Mon, 11 Sep 2023 20:51:04 +0000 Subject: [PATCH] auxdisplay: panel: Replace deprecated strncpy() with strtomem_pad() `strncpy` is deprecated and as such we should prefer more robust and less ambiguous interfaces. In this case, all of `press_str`, `repeat_str` and `release_str` are explicitly marked as nonstring: | struct { /* valid when type == INPUT_TYPE_KBD */ | char press_str[sizeof(void *) + sizeof(int)] __nonstring; | char repeat_str[sizeof(void *) + sizeof(int)] __nonstring; | char release_str[sizeof(void *) + sizeof(int)] __nonstring; | } kbd; ... which makes `strtomem_pad` a suitable replacement as it is functionally the same whilst being more obvious about its behavior. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Cc: Kees Cook Signed-off-by: Justin Stitt Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20230911-strncpy-drivers-auxdisplay-panel-c-v1-1-b60bd0ae8552@google.com Signed-off-by: Kees Cook --- drivers/auxdisplay/panel.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c index eba04c0de7eb..e20d35bdf5fe 100644 --- a/drivers/auxdisplay/panel.c +++ b/drivers/auxdisplay/panel.c @@ -1449,10 +1449,9 @@ static struct logical_input *panel_bind_key(const char *name, const char *press, key->rise_time = 1; key->fall_time = 1; - strncpy(key->u.kbd.press_str, press, sizeof(key->u.kbd.press_str)); - strncpy(key->u.kbd.repeat_str, repeat, sizeof(key->u.kbd.repeat_str)); - strncpy(key->u.kbd.release_str, release, - sizeof(key->u.kbd.release_str)); + strtomem_pad(key->u.kbd.press_str, press, '\0'); + strtomem_pad(key->u.kbd.repeat_str, repeat, '\0'); + strtomem_pad(key->u.kbd.release_str, release, '\0'); list_add(&key->list, &logical_inputs); return key; }