diff mbox series

wifi: wlcore: replace deprecated strncpy with strscpy

Message ID 20231018-strncpy-drivers-net-wireless-ti-wlcore-boot-c-v1-1-d3c6cc6b80fe@google.com (mailing list archive)
State Mainlined
Commit 75fdaa28f10310776fd8370b88ef366e42996f83
Headers show
Series wifi: wlcore: replace deprecated strncpy with strscpy | expand

Commit Message

Justin Stitt Oct. 18, 2023, 9:36 p.m. UTC
strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.

We expect wl->chip.fw_ver_str to be NUL-terminated based on its usage
with DRIVER_STATE_PRINT_STR() in debugfs.c:
491 | DRIVER_STATE_PRINT_STR(chip.fw_ver_str);
... which uses DRIVER_STATE_PRINT():
444 | #define DRIVER_STATE_PRINT_STR(x)  DRIVER_STATE_PRINT(x, "%s")
... which relies on scnprintf:
434 | #define DRIVER_STATE_PRINT(x, fmt)   \
435 | 	(res += scnprintf(buf + res, DRIVER_STATE_BUF_LEN - res,\
436 | 			  #x " = " fmt "\n", wl->x))

Moreover, NUL-padding is not required.

Considering the above, a suitable replacement is `strscpy` [2] due to
the fact that it guarantees NUL-termination on the destination buffer
without 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@vger.kernel.org
Similar-to: https://lore.kernel.org/all/20231018-strncpy-drivers-net-wireless-ti-wl18xx-main-c-v2-1-ab828a491ce5@google.com/
Signed-off-by: Justin Stitt <justinstitt@google.com>
---
Note: build-tested only.

Found with: $ rg "strncpy\("
---
 drivers/net/wireless/ti/wlcore/boot.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)


---
base-commit: 58720809f52779dc0f08e53e54b014209d13eebb
change-id: 20231018-strncpy-drivers-net-wireless-ti-wlcore-boot-c-b318a8677793

Best regards,
--
Justin Stitt <justinstitt@google.com>

Comments

Kees Cook Oct. 19, 2023, 5:30 a.m. UTC | #1
On Wed, Oct 18, 2023 at 09:36:56PM +0000, Justin Stitt wrote:
> strncpy() is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
> 
> We expect wl->chip.fw_ver_str to be NUL-terminated based on its usage
> with DRIVER_STATE_PRINT_STR() in debugfs.c:
> 491 | DRIVER_STATE_PRINT_STR(chip.fw_ver_str);
> ... which uses DRIVER_STATE_PRINT():
> 444 | #define DRIVER_STATE_PRINT_STR(x)  DRIVER_STATE_PRINT(x, "%s")
> ... which relies on scnprintf:
> 434 | #define DRIVER_STATE_PRINT(x, fmt)   \
> 435 | 	(res += scnprintf(buf + res, DRIVER_STATE_BUF_LEN - res,\
> 436 | 			  #x " = " fmt "\n", wl->x))
> 
> Moreover, NUL-padding is not required.
> 
> Considering the above, a suitable replacement is `strscpy` [2] due to
> the fact that it guarantees NUL-termination on the destination buffer
> without 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@vger.kernel.org
> Similar-to: https://lore.kernel.org/all/20231018-strncpy-drivers-net-wireless-ti-wl18xx-main-c-v2-1-ab828a491ce5@google.com/
> Signed-off-by: Justin Stitt <justinstitt@google.com>

Yup, looks good.

Reviewed-by: Kees Cook <keescook@chromium.org>
Kalle Valo Oct. 23, 2023, 5:29 p.m. UTC | #2
Justin Stitt <justinstitt@google.com> wrote:

> strncpy() is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
> 
> We expect wl->chip.fw_ver_str to be NUL-terminated based on its usage
> with DRIVER_STATE_PRINT_STR() in debugfs.c:
> 491 | DRIVER_STATE_PRINT_STR(chip.fw_ver_str);
> ... which uses DRIVER_STATE_PRINT():
> 444 | #define DRIVER_STATE_PRINT_STR(x)  DRIVER_STATE_PRINT(x, "%s")
> ... which relies on scnprintf:
> 434 | #define DRIVER_STATE_PRINT(x, fmt)   \
> 435 | 	(res += scnprintf(buf + res, DRIVER_STATE_BUF_LEN - res,\
> 436 | 			  #x " = " fmt "\n", wl->x))
> 
> Moreover, NUL-padding is not required.
> 
> Considering the above, a suitable replacement is `strscpy` [2] due to
> the fact that it guarantees NUL-termination on the destination buffer
> without 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@vger.kernel.org
> Similar-to: https://lore.kernel.org/all/20231018-strncpy-drivers-net-wireless-ti-wl18xx-main-c-v2-1-ab828a491ce5@google.com/
> Signed-off-by: Justin Stitt <justinstitt@google.com>
> Reviewed-by: Kees Cook <keescook@chromium.org>

Patch applied to wireless-next.git, thanks.

75fdaa28f103 wifi: wlcore: boot: replace deprecated strncpy with strscpy
diff mbox series

Patch

diff --git a/drivers/net/wireless/ti/wlcore/boot.c b/drivers/net/wireless/ti/wlcore/boot.c
index 85abd0a2d1c9..f481c2e3dbc8 100644
--- a/drivers/net/wireless/ti/wlcore/boot.c
+++ b/drivers/net/wireless/ti/wlcore/boot.c
@@ -41,12 +41,9 @@  static int wlcore_boot_parse_fw_ver(struct wl1271 *wl,
 {
 	int ret;
 
-	strncpy(wl->chip.fw_ver_str, static_data->fw_version,
+	strscpy(wl->chip.fw_ver_str, static_data->fw_version,
 		sizeof(wl->chip.fw_ver_str));
 
-	/* make sure the string is NULL-terminated */
-	wl->chip.fw_ver_str[sizeof(wl->chip.fw_ver_str) - 1] = '\0';
-
 	ret = sscanf(wl->chip.fw_ver_str + 4, "%u.%u.%u.%u.%u",
 		     &wl->chip.fw_ver[0], &wl->chip.fw_ver[1],
 		     &wl->chip.fw_ver[2], &wl->chip.fw_ver[3],