| Message ID | 20230914-strncpy-drivers-hwmon-asus_wmi_sensors-c-v1-1-e1703cf91693@google.com (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 8046da444df5fc35ed12b6b52c090dc89c8a5f96 |
| Headers | show |
| Series | hwmon: (asus_wmi_sensors) refactor deprecated strncpy | expand |
On Thu, Sep 14, 2023 at 11:10:34PM +0000, Justin Stitt wrote: > `strncpy` is deprecated for use on NUL-terminated destination strings [1]. > > We should prefer more robust and less ambiguous string interfaces. > > A suitable replacement is `strscpy` [2] due to the fact that it > guarantees NUL-termination on the destination buffer without > unnecessarily NUL-padding. If, for any reason, NUL-padding is needed > let's opt for `strscpy_pad`. > > 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 > Signed-off-by: Justin Stitt <justinstitt@google.com> A classic replacement. :) Reviewed-by: Kees Cook <keescook@chromium.org>
On Thu, 14 Sep 2023 23:10:34 +0000, Justin Stitt wrote: > `strncpy` is deprecated for use on NUL-terminated destination strings [1]. > > We should prefer more robust and less ambiguous string interfaces. > > A suitable replacement is `strscpy` [2] due to the fact that it > guarantees NUL-termination on the destination buffer without > unnecessarily NUL-padding. If, for any reason, NUL-padding is needed > let's opt for `strscpy_pad`. > > [...] Applied to for-next/hardening, thanks! (Subject updated...) Take care,
diff --git a/drivers/hwmon/asus_wmi_sensors.c b/drivers/hwmon/asus_wmi_sensors.c index 6e8a908171f0..c2dd7ff882f2 100644 --- a/drivers/hwmon/asus_wmi_sensors.c +++ b/drivers/hwmon/asus_wmi_sensors.c @@ -300,7 +300,7 @@ static int asus_wmi_sensor_info(int index, struct asus_wmi_sensor_info *s) goto out_free_obj; } - strncpy(s->name, name_obj.string.pointer, sizeof(s->name) - 1); + strscpy(s->name, name_obj.string.pointer, sizeof(s->name)); data_type_obj = obj->package.elements[1]; if (data_type_obj.type != ACPI_TYPE_INTEGER) {
`strncpy` is deprecated for use on NUL-terminated destination strings [1]. We should prefer more robust and less ambiguous string interfaces. A suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. If, for any reason, NUL-padding is needed let's opt for `strscpy_pad`. 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 Signed-off-by: Justin Stitt <justinstitt@google.com> --- drivers/hwmon/asus_wmi_sensors.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 3669558bdf354cd352be955ef2764cde6a9bf5ec change-id: 20230914-strncpy-drivers-hwmon-asus_wmi_sensors-c-e10e094a467d Best regards, -- Justin Stitt <justinstitt@google.com>