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

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Message-ID: <20230824-strncpy-drivers-accel-habanalabs-goya-goya-c-v1-1-b81d5639e7a3@google.com>
Date:   Thu, 24 Aug 2023 20:49:11 +0000
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,
        Justin Stitt <justinstitt@...gle.com>
Subject: [PATCH] habanalabs/goya: refactor deprecated strncpy

`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>