From b545465e22f5fec2862132c01a5d2abd3c4c4d50 Mon Sep 17 00:00:00 2001 From: Justin Stitt Date: Wed, 13 Sep 2023 00:23:19 +0000 Subject: [PATCH] cpuidle: dt: Replace deprecated strncpy() with strscpy() `strncpy` is deprecated for use on NUL-terminated destination strings [1]. We should prefer more robust and less ambiguous string interfaces. A suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer. With this, we can also drop the now unnecessary `CPUIDLE_(NAME|DESC)_LEN - 1` pieces. Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20230913-strncpy-drivers-cpuidle-dt_idle_states-c-v1-1-d16a0dbe5658@google.com Signed-off-by: Kees Cook --- drivers/cpuidle/dt_idle_states.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c index 12fec92a85fd..97feb7d8fb23 100644 --- a/drivers/cpuidle/dt_idle_states.c +++ b/drivers/cpuidle/dt_idle_states.c @@ -84,8 +84,8 @@ static int init_state_node(struct cpuidle_state *idle_state, * replace with kstrdup and pointer assignment when name * and desc become string pointers */ - strncpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN - 1); - strncpy(idle_state->desc, desc, CPUIDLE_DESC_LEN - 1); + strscpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN); + strscpy(idle_state->desc, desc, CPUIDLE_DESC_LEN); return 0; }