| Message ID | 20231018-strncpy-drivers-net-wireless-ti-wl1251-main-c-v2-1-67b63dfcb1b8@google.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] wifi: wl1251: replace deprecated strncpy with strscpy | expand |
On Wed, Oct 18, 2023 at 09:15:23PM +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. > > Based on other assignments of similar fw_version fields we can see that > NUL-termination is required but not NUL-padding: > ethernet/intel/ixgbe/ixgbe_ethtool.c > 1111: strscpy(drvinfo->fw_version, adapter->eeprom_id, > 1112: sizeof(drvinfo->fw_version)); > > ethernet/intel/igc/igc_ethtool.c > 147: scnprintf(adapter->fw_version, > 148: sizeof(adapter->fw_version), > 153: strscpy(drvinfo->fw_version, adapter->fw_version, > 154: sizeof(drvinfo->fw_version)); > > wireless/broadcom/brcm80211/brcmfmac/core.c > 569: strscpy(info->fw_version, drvr->fwver, sizeof(info->fw_version)); > > wireless/broadcom/brcm80211/brcmsmac/main.c > 7867: snprintf(wlc->wiphy->fw_version, > 7868: sizeof(wlc->wiphy->fw_version), "%u.%u", rev, patch); > > wireless/broadcom/b43legacy/main.c > 1765: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", > > wireless/broadcom/b43/main.c > 2730: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", > > wireless/intel/iwlwifi/dvm/main.c > 1465: snprintf(priv->hw->wiphy->fw_version, > 1466: sizeof(priv->hw->wiphy->fw_version), > > wireless/intel/ipw2x00/ipw2100.c > 5905: snprintf(info->fw_version, sizeof(info->fw_version), "%s:%d:%s", > > A suitable replacement is `strscpy` 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://github.com/KSPP/linux/issues/90 > Cc: linux-hardening@vger.kernel.org > Signed-off-by: Justin Stitt <justinstitt@google.com> Yup, looks like a clean replacement. Reviewed-by: Kees Cook <keescook@chromium.org>
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. > > Based on other assignments of similar fw_version fields we can see that > NUL-termination is required but not NUL-padding: > ethernet/intel/ixgbe/ixgbe_ethtool.c > 1111: strscpy(drvinfo->fw_version, adapter->eeprom_id, > 1112: sizeof(drvinfo->fw_version)); > > ethernet/intel/igc/igc_ethtool.c > 147: scnprintf(adapter->fw_version, > 148: sizeof(adapter->fw_version), > 153: strscpy(drvinfo->fw_version, adapter->fw_version, > 154: sizeof(drvinfo->fw_version)); > > wireless/broadcom/brcm80211/brcmfmac/core.c > 569: strscpy(info->fw_version, drvr->fwver, sizeof(info->fw_version)); > > wireless/broadcom/brcm80211/brcmsmac/main.c > 7867: snprintf(wlc->wiphy->fw_version, > 7868: sizeof(wlc->wiphy->fw_version), "%u.%u", rev, patch); > > wireless/broadcom/b43legacy/main.c > 1765: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", > > wireless/broadcom/b43/main.c > 2730: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", > > wireless/intel/iwlwifi/dvm/main.c > 1465: snprintf(priv->hw->wiphy->fw_version, > 1466: sizeof(priv->hw->wiphy->fw_version), > > wireless/intel/ipw2x00/ipw2100.c > 5905: snprintf(info->fw_version, sizeof(info->fw_version), "%s:%d:%s", > > A suitable replacement is `strscpy` 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://github.com/KSPP/linux/issues/90 > Cc: linux-hardening@vger.kernel.org > Signed-off-by: Justin Stitt <justinstitt@google.com> > Reviewed-by: Kees Cook <keescook@chromium.org> Patch applied to wireless-next.git, thanks. 70bd8e0d01f6 wifi: wl1251: replace deprecated strncpy with strscpy
diff --git a/drivers/net/wireless/ti/wl1251/main.c b/drivers/net/wireless/ti/wl1251/main.c index eded284af600..cd9a41f59f32 100644 --- a/drivers/net/wireless/ti/wl1251/main.c +++ b/drivers/net/wireless/ti/wl1251/main.c @@ -404,7 +404,7 @@ static int wl1251_op_start(struct ieee80211_hw *hw) /* update hw/fw version info in wiphy struct */ wiphy->hw_version = wl->chip_id; - strncpy(wiphy->fw_version, wl->fw_ver, sizeof(wiphy->fw_version)); + strscpy(wiphy->fw_version, wl->fw_ver, sizeof(wiphy->fw_version)); out: if (ret < 0)
strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. Based on other assignments of similar fw_version fields we can see that NUL-termination is required but not NUL-padding: ethernet/intel/ixgbe/ixgbe_ethtool.c 1111: strscpy(drvinfo->fw_version, adapter->eeprom_id, 1112: sizeof(drvinfo->fw_version)); ethernet/intel/igc/igc_ethtool.c 147: scnprintf(adapter->fw_version, 148: sizeof(adapter->fw_version), 153: strscpy(drvinfo->fw_version, adapter->fw_version, 154: sizeof(drvinfo->fw_version)); wireless/broadcom/brcm80211/brcmfmac/core.c 569: strscpy(info->fw_version, drvr->fwver, sizeof(info->fw_version)); wireless/broadcom/brcm80211/brcmsmac/main.c 7867: snprintf(wlc->wiphy->fw_version, 7868: sizeof(wlc->wiphy->fw_version), "%u.%u", rev, patch); wireless/broadcom/b43legacy/main.c 1765: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", wireless/broadcom/b43/main.c 2730: snprintf(wiphy->fw_version, sizeof(wiphy->fw_version), "%u.%u", wireless/intel/iwlwifi/dvm/main.c 1465: snprintf(priv->hw->wiphy->fw_version, 1466: sizeof(priv->hw->wiphy->fw_version), wireless/intel/ipw2x00/ipw2100.c 5905: snprintf(info->fw_version, sizeof(info->fw_version), "%s:%d:%s", A suitable replacement is `strscpy` 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://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt <justinstitt@google.com> --- Changes in v2: - fix subject (thanks Jeff) - Link to v1: https://lore.kernel.org/r/20231017-strncpy-drivers-net-wireless-ti-wl1251-main-c-v1-1-3a5c02382e35@google.com --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/net/wireless/ti/wl1251/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: 58720809f52779dc0f08e53e54b014209d13eebb change-id: 20231017-strncpy-drivers-net-wireless-ti-wl1251-main-c-6b2da81eccad Best regards, -- Justin Stitt <justinstitt@google.com>