strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. To keep node->current_state_name and node->prev_state_name NUL-padded and NUL-terminated let's use strscpy_pad() as this implicitly provides both. For the swap between the two, a simple memcpy will suffice. 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 Signed-off-by: Justin Stitt <justinstitt@xxxxxxxxxx> --- Changes in v2: - use strscpy_pad (thanks Kees) - Link to v1: https://lore.kernel.org/r/20231023-strncpy-drivers-scsi-elx-libefc-efc_node-h-v1-1-8b66878b6796@xxxxxxxxxx --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/scsi/elx/libefc/efc_node.h | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/elx/libefc/efc_node.h b/drivers/scsi/elx/libefc/efc_node.h index e9c600ac45d5..e57579988ba4 100644 --- a/drivers/scsi/elx/libefc/efc_node.h +++ b/drivers/scsi/elx/libefc/efc_node.h @@ -26,13 +26,13 @@ efc_node_evt_set(struct efc_sm_ctx *ctx, enum efc_sm_event evt, struct efc_node *node = ctx->app; if (evt == EFC_EVT_ENTER) { - strncpy(node->current_state_name, handler, - sizeof(node->current_state_name)); + strscpy_pad(node->current_state_name, handler, + sizeof(node->current_state_name)); } else if (evt == EFC_EVT_EXIT) { - strncpy(node->prev_state_name, node->current_state_name, - sizeof(node->prev_state_name)); - strncpy(node->current_state_name, "invalid", - sizeof(node->current_state_name)); + memcpy(node->prev_state_name, node->current_state_name, + sizeof(node->prev_state_name)); + strscpy_pad(node->current_state_name, "invalid", + sizeof(node->current_state_name)); } node->prev_evt = node->current_evt; node->current_evt = evt; --- base-commit: 9c5d00cb7b6bbc5a7965d9ab7d223b5402d1f02c change-id: 20231023-strncpy-drivers-scsi-elx-libefc-efc_node-h-cbbf753197b7 Best regards, -- Justin Stitt <justinstitt@xxxxxxxxxx>
