Messages in this thread Patch in this message | | | Date | Tue, 10 Oct 2023 22:26:59 +0000 | Subject | [PATCH v1 net-next 6/7] igbvf: replace deprecated strncpy with strscpy | From | Justin Stitt <> |
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`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 netdev->name to be NUL-terminated based on its usage with `strlen` and format strings: | if (strlen(netdev->name) < (IFNAMSIZ - 5)) { | sprintf(adapter->tx_ring->name, "%s-tx-0", netdev->name);
Moreover, we do not need NUL-padding as netdev is already zero-allocated: | netdev = alloc_etherdev(sizeof(struct igbvf_adapter)); ... alloc_etherdev() -> alloc_etherdev_mq() -> alloc_etherdev_mqs() -> alloc_netdev_mqs() ... | p = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL);
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 Signed-off-by: Justin Stitt <justinstitt@google.com>
--- Note: build-tested only. --- drivers/net/ethernet/intel/igbvf/netdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c b/drivers/net/ethernet/intel/igbvf/netdev.c index 7ff2752dd763..fd712585af27 100644 --- a/drivers/net/ethernet/intel/igbvf/netdev.c +++ b/drivers/net/ethernet/intel/igbvf/netdev.c @@ -2785,7 +2785,7 @@ static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent) igbvf_set_ethtool_ops(netdev); netdev->watchdog_timeo = 5 * HZ; - strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1); + strscpy(netdev->name, pci_name(pdev), sizeof(netdev->name)); adapter->bd_number = cards_found++; -- 2.42.0.609.gbb76f46606-goog
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