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Message-ID: <202310131630.5E435AD@keescook> Date: Fri, 13 Oct 2023 16:35:06 -0700 From: Kees Cook <keescook@...omium.org> To: Justin Stitt <justinstitt@...gle.com> Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH] net: phy: tja11xx: replace deprecated strncpy with ethtool_sprintf On Fri, Oct 13, 2023 at 02:23:34PM -0700, Justin Stitt wrote: > On Fri, Oct 13, 2023 at 2:12 PM Justin Stitt <justinstitt@...gle.com> wrote: > > > > On Fri, Oct 13, 2023 at 1:13 PM Andrew Lunn <andrew@...n.ch> wrote: > > > > > > On Fri, Oct 13, 2023 at 12:53:53PM -0700, Justin Stitt wrote: > > > > On Fri, Oct 13, 2023 at 5:22 AM Andrew Lunn <andrew@...n.ch> wrote: > > > > > > > > > > > - for (i = 0; i < ARRAY_SIZE(tja11xx_hw_stats); i++) { > > > > > > - strncpy(data + i * ETH_GSTRING_LEN, > > > > > > - tja11xx_hw_stats[i].string, ETH_GSTRING_LEN); > > > > > > - } > > > > > > + for (i = 0; i < ARRAY_SIZE(tja11xx_hw_stats); i++) > > > > > > + ethtool_sprintf(&data, "%s", tja11xx_hw_stats[i].string); > > > > > > } > > > > > > > > > > I assume you are using "%s" because tja11xx_hw_stats[i].string cannot > > > > > be trusted as a format string? Is this indicating we need an > > > > > ethtool_puts() ? > > > > > > > > Indeed, it would trigger a -Wformat-security warning. > > > > > > > > An ethtool_puts() would be useful for this situation. > > > > > > Hi Justin > > > > > > hyperv/netvsc_drv.c: ethtool_sprintf(&p, netvsc_stats[i].name); > > > hyperv/netvsc_drv.c: ethtool_sprintf(&p, vf_stats[i].name); > > > ethernet/intel/i40e/i40e_ethtool.c: ethtool_sprintf(&p, i40e_gstrings_priv_flags[i].flag_string); > > > ethernet/intel/i40e/i40e_ethtool.c: ethtool_sprintf(&p, i40e_gl_gstrings_priv_flags[i].flag_string); > > > ethernet/intel/ice/ice_ethtool.c: ethtool_sprintf(&p, ice_gstrings_priv_flags[i].name); > > > ethernet/intel/igc/igc_ethtool.c: ethtool_sprintf(&p, igc_gstrings_stats[i].stat_string); > > > ethernet/intel/ixgbe/ixgbe_ethtool.c: ethtool_sprintf(&p, ixgbe_gstrings_test[i]); > > > ethernet/netronome/nfp/nfp_net_ethtool.c: ethtool_sprintf(&data, nfp_self_test[i].name); > > > ethernet/netronome/nfp/nfp_net_ethtool.c: ethtool_sprintf(&data, nfp_net_et_stats[i + swap_off].name); > > > ethernet/netronome/nfp/nfp_net_ethtool.c: ethtool_sprintf(&data, nfp_net_et_stats[i - swap_off].name); > > > ethernet/netronome/nfp/nfp_net_ethtool.c: ethtool_sprintf(&data, nfp_net_et_stats[i].name); > > > ethernet/fungible/funeth/funeth_ethtool.c: ethtool_sprintf(&p, txq_stat_names[j]); > > > ethernet/fungible/funeth/funeth_ethtool.c: ethtool_sprintf(&p, xdpq_stat_names[j]); > > > ethernet/fungible/funeth/funeth_ethtool.c: ethtool_sprintf(&p, rxq_stat_names[j]); > > > ethernet/fungible/funeth/funeth_ethtool.c: ethtool_sprintf(&p, tls_stat_names[j]); > > > ethernet/amazon/ena/ena_ethtool.c: ethtool_sprintf(&data, ena_stats->name); > > > ethernet/amazon/ena/ena_ethtool.c: ethtool_sprintf(&data, ena_stats->name); > > > ethernet/brocade/bna/bnad_ethtool.c: ethtool_sprintf(&string, bnad_net_stats_strings[i]); > > > ethernet/pensando/ionic/ionic_stats.c: ethtool_sprintf(buf, ionic_lif_stats_desc[i].name); > > > ethernet/pensando/ionic/ionic_stats.c: ethtool_sprintf(buf, ionic_port_stats_desc[i].name); > > > ethernet/hisilicon/hns/hns_dsaf_gmac.c: ethtool_sprintf(&buff, g_gmac_stats_string[i].desc); > > > ethernet/hisilicon/hns/hns_dsaf_xgmac.c: ethtool_sprintf(&buff, g_xgmac_stats_string[i].desc); > > > vmxnet3/vmxnet3_ethtool.c: ethtool_sprintf(&buf, vmxnet3_tq_dev_stats[i].desc); > > > vmxnet3/vmxnet3_ethtool.c: ethtool_sprintf(&buf, vmxnet3_tq_driver_stats[i].desc); > > > vmxnet3/vmxnet3_ethtool.c: ethtool_sprintf(&buf, vmxnet3_rq_dev_stats[i].desc); > > > vmxnet3/vmxnet3_ethtool.c: ethtool_sprintf(&buf, vmxnet3_rq_driver_stats[i].desc); > > > vmxnet3/vmxnet3_ethtool.c: ethtool_sprintf(&buf, vmxnet3_global_stats[i].desc); > > > > > > > Woah, are these all triggering -Wformat-security warnings? > > Erhm, I guess -Wformat-security is turned off: > > ./scripts/Makefile.extrawarn +16: > KBUILD_CFLAGS += -Wno-format-security Whee. This is a longer issue, but yes, it would be nice if we could get out of the way of enabling -Wformat-security again some day. > Kees, what do you think about this warning and the semantics of: > > 1) ethtool_sprintf(&data, "%s", some[i].string); > 2) ethtool_sprintf(&data, some[i].string); > 3) ethtool_puts(&data, some[i].string); I've been told that this whole ethtool API area is considered deprecated. If that holds, then I don't think it's worth adding new helpers to support it when ethtool_sprintf() is sufficient. Once you're done with the strncpy->ethtool_sprintf conversions I think it would be nice to have a single patch that fixes all of these "%s"-less instances to use "%s". (Doing per-driver fixes for that case seems just overly painful.) -- Kees Cook
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