linux-hardening - Re: [PATCH] habanalabs/goya: refactor deprecated strncpy

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Date:   Fri, 25 Aug 2023 15:12:10 -0700
From:   Justin Stitt <justinstitt@...gle.com>
To:     Oded Gabbay <ogabbay@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] habanalabs/goya: refactor deprecated strncpy

This patch as well as two other related patches were combined into a
single patch [1]

 Thu, Aug 24, 2023 at 1:49 PM Justin Stitt <justinstitt@...gle.com> wrote:
>
> `strncpy` is deprecated for use on NUL-terminated destination strings [1].
>
> A suitable replacement is `strscpy` [2] due to the fact that it
> guarantees NUL-termination on its destination buffer argument which is
> _not_ the case for `strncpy`!
>
> Link: 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@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> ---
> Note: build-tested only.
> ---
>  drivers/accel/habanalabs/goya/goya.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/accel/habanalabs/goya/goya.c b/drivers/accel/habanalabs/goya/goya.c
> index 7c685e6075f6..d0ac7065f3d7 100644
> --- a/drivers/accel/habanalabs/goya/goya.c
> +++ b/drivers/accel/habanalabs/goya/goya.c
> @@ -466,7 +466,7 @@ int goya_set_fixed_properties(struct hl_device *hdev)
>         prop->pcie_dbi_base_address = mmPCIE_DBI_BASE;
>         prop->pcie_aux_dbi_reg_addr = CFG_BASE + mmPCIE_AUX_DBI;
>
> -       strncpy(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
> +       strscpy(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
>                 CARD_NAME_MAX_LEN);
>
>         prop->max_pending_cs = GOYA_MAX_PENDING_CS;
> @@ -5122,7 +5122,7 @@ int goya_cpucp_info_get(struct hl_device *hdev)
>         }
>
>         if (!strlen(prop->cpucp_info.card_name))
> -               strncpy(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
> +               strscpy(prop->cpucp_info.card_name, GOYA_DEFAULT_CARD_NAME,
>                                 CARD_NAME_MAX_LEN);
>
>         return 0;
>
> ---
> base-commit: f9604036a3fb6149badf346994b46b03f9292db7
> change-id: 20230824-strncpy-drivers-accel-habanalabs-goya-goya-c-2a05a2202c78
>
> Best regards,
> --
> Justin Stitt <justinstitt@...gle.com>
>

[1]: https://lore.kernel.org/r/20230825-strncpy-habanalabs-combined-v1-1-daa05a89b7e3@google.com