| Message ID | 20231005-strncpy-drivers-net-ethernet-cavium-liquidio-lio_vf_rep-c-v1-1-92123a747780@google.com (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | a16724289af0da1f922e41fd09f229f0beec10f9 |
| Headers | show |
| Series | liquidio: replace deprecated strncpy with strscpy | expand |
On Thu, Oct 05, 2023 at 09:55:06PM +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. > > NUL-padding is not required as rep_cfg is memset to 0: > | memset(&rep_cfg, 0, sizeof(rep_cfg)); > > 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/cavium/liquidio/lio_vf_rep.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c > index 600de587d7a9..aa6c0dfb6f1c 100644 > --- a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c > +++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c > @@ -638,7 +638,8 @@ lio_vf_rep_netdev_event(struct notifier_block *nb, > memset(&rep_cfg, 0, sizeof(rep_cfg)); > rep_cfg.req_type = LIO_VF_REP_REQ_DEVNAME; > rep_cfg.ifidx = vf_rep->ifidx; > - strncpy(rep_cfg.rep_name.name, ndev->name, LIO_IF_NAME_SIZE); > + strscpy(rep_cfg.rep_name.name, ndev->name, > + sizeof(rep_cfg.rep_name.name)); struct lio_vf_rep_req { ... union { struct lio_vf_rep_name { char name[LIO_IF_NAME_SIZE]; } rep_name; Yup, sizeof(rep_cfg.rep_name.name) == LIO_IF_NAME_SIZE. Reviewed-by: Kees Cook <keescook@chromium.org>
Hello: This patch was applied to netdev/net-next.git (main) by Jakub Kicinski <kuba@kernel.org>: On Thu, 05 Oct 2023 21:55:06 +0000 you 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. > > NUL-padding is not required as rep_cfg is memset to 0: > | memset(&rep_cfg, 0, sizeof(rep_cfg)); > > [...] Here is the summary with links: - liquidio: replace deprecated strncpy with strscpy https://git.kernel.org/netdev/net-next/c/a16724289af0 You are awesome, thank you!
diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c index 600de587d7a9..aa6c0dfb6f1c 100644 --- a/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c +++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_rep.c @@ -638,7 +638,8 @@ lio_vf_rep_netdev_event(struct notifier_block *nb, memset(&rep_cfg, 0, sizeof(rep_cfg)); rep_cfg.req_type = LIO_VF_REP_REQ_DEVNAME; rep_cfg.ifidx = vf_rep->ifidx; - strncpy(rep_cfg.rep_name.name, ndev->name, LIO_IF_NAME_SIZE); + strscpy(rep_cfg.rep_name.name, ndev->name, + sizeof(rep_cfg.rep_name.name)); ret = lio_vf_rep_send_soft_command(oct, &rep_cfg, sizeof(rep_cfg), NULL, 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. NUL-padding is not required as rep_cfg is memset to 0: | memset(&rep_cfg, 0, sizeof(rep_cfg)); 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/cavium/liquidio/lio_vf_rep.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2 change-id: 20231005-strncpy-drivers-net-ethernet-cavium-liquidio-lio_vf_rep-c-b23567b42939 Best regards, -- Justin Stitt <justinstitt@google.com>