`strncpy` is deprecated for use on NUL-terminated destination strings [1]. `aoe_iflist` is expected to be NUL-terminated which is evident by its use with string apis later on like `strspn`: | p = aoe_iflist + strspn(aoe_iflist, WHITESPACE); It also seems `aoe_iflist` does not need to be NUL-padded which means `strscpy` [2] is a suitable replacement due to the fact that it guarantees NUL-termination on the destination buffer while not unnecessarily NUL-padding. 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@xxxxxxxxxxxxxxx Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Xu Panda <xu.panda@xxxxxxxxxx> Cc: Yang Yang <yang.yang29@xxxxxxx> Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> --- Changes in v2: - reword subject line (thanks Jens) - rebase onto 3669558bdf35 - Link to v1: https://lore.kernel.org/r/20230911-strncpy-drivers-block-aoe-aoenet-c-v1-1-9643d6137ff9@xxxxxxxxxx --- Note: This exact same patch exists [3] but seemed to die so I'm resending. [3]: https://lore.kernel.org/all/202212051930256039214@xxxxxxxxxx/ --- drivers/block/aoe/aoenet.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/block/aoe/aoenet.c b/drivers/block/aoe/aoenet.c index 63773a90581d..c51ea95bc2ce 100644 --- a/drivers/block/aoe/aoenet.c +++ b/drivers/block/aoe/aoenet.c @@ -39,8 +39,7 @@ static struct ktstate kts; #ifndef MODULE static int __init aoe_iflist_setup(char *str) { - strncpy(aoe_iflist, str, IFLISTSZ); - aoe_iflist[IFLISTSZ - 1] = '\0'; + strscpy(aoe_iflist, str, IFLISTSZ); return 1; } --- base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec change-id: 20230911-strncpy-drivers-block-aoe-aoenet-c-024debad6105 Best regards, -- Justin Stitt <justinstitt@xxxxxxxxxx>
