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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id l128sm585740pgl.18.2021.06.02.13.27.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Jun 2021 13:27:44 -0700 (PDT) From: Kees Cook To: "David S. Miller" Cc: Kees Cook , Jakub Kicinski , Florian Fainelli , Di Zhu , Pablo Neira Ayuso , Cong Wang , Taehee Yoo , "Gustavo A. R. Silva" , Felix Fietkau , Eran Ben Elisha , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] net: vlan: Avoid using strncpy() Date: Wed, 2 Jun 2021 13:27:41 -0700 Message-Id: <20210602202741.4078789-1-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Patch-Hashes: v=1; h=sha256; g=88816f8807de23dfa0b0dd3e00a4510275a736b2; i=E6vyLUaKYvlfizHY96CoIZkTnxuv3thEHFef0cl9Wew=; m=qgZWEVcHV6EOQQGK82kq1AwupK+IS9seUUAKn+Svxnk=; p=Vau8YbH5AGuE9RMmHWWxXTFxNJzGEGEyDbqLpLODzzE= X-Patch-Sig: m=pgp; i=keescook@chromium.org; s=0x0x8972F4DFDC6DC026; b=iQIzBAABCgAdFiEEpcP2jyKd1g9yPm4TiXL039xtwCYFAmC36b0ACgkQiXL039xtwCY27RAAlUK AybI2ga1SMQVVI05kppeQdyQdJGd1fiHoKTIkxE02jQ60jDyZ+x4EHQtLQKXXvnz0O50BKglH7YuF LbBWPeHxxqdL4bqbCqbmO5XT+AiJ8PVcWRXBV9QMO8Ejct5BmzmQ50M9O//qVzXh/ogDMc+pWS9fG VMijkpEjvQQ+ID5wGgGPbIehjIbiyRdKINNf6674FsRCnkonFsmE24Ls+hhc+tT4uO+ndb1a+xuha 0hscBZLYVBR1DRHwZNCHUpJIsdUQ5UgSoUFeOx86wcAQZiEAMP0uS0OBs5MdHTG5qle+KOpFCnrw9 9vJQMFFmtyG028U1kxCg3N4nO27JiJ6fx8LO1BAOICxSQjysPH+isJAdWZoDVSdxQgoCDI2PAkDWb 4+YU3xcgcixf6H672T2Pbz8NrRNX6tT1SgeHmkbPHG1GiP7tis3Z1QEe3fWtC3VDUAAB2U91t2Oyd xfTN9FEKuH/q5Ji+4Ui/rHVQWvni2hBMtrSKtcB69jieuq5BS2HwGFgx7XwlOD8VocoZ9hKBvLAhN itw7/v9bOSLzjpGhmjowlmSOq8wytMhxnCJvBTfITrWQWl8OxOMdZ8pACFsecZGmCCpiTX1ikUtvH d4MZsbvKABfmZLxMxgzMqWkPgtbONMO83uf336pEsFLuhTXCA0v8/oQo6KnZ5F9M= Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Use strscpy_pad() instead of strncpy() which is considered deprecated: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings Signed-off-by: Kees Cook --- net/8021q/vlan.c | 3 ++- net/8021q/vlan.h | 3 ++- net/8021q/vlan_dev.c | 6 +++--- 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c index fb3d3262dc1a..4cdf8416869d 100644 --- a/net/8021q/vlan.c +++ b/net/8021q/vlan.c @@ -638,7 +638,8 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg) case GET_VLAN_REALDEV_NAME_CMD: err = 0; - vlan_dev_get_realdev_name(dev, args.u.device2); + vlan_dev_get_realdev_name(dev, args.u.device2, + sizeof(args.u.device2)); if (copy_to_user(arg, &args, sizeof(struct vlan_ioctl_args))) err = -EFAULT; diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h index fa3ad3d4d58c..e3f6ff05a528 100644 --- a/net/8021q/vlan.h +++ b/net/8021q/vlan.h @@ -129,7 +129,8 @@ void vlan_dev_set_ingress_priority(const struct net_device *dev, int vlan_dev_set_egress_priority(const struct net_device *dev, u32 skb_prio, u16 vlan_prio); int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask); -void vlan_dev_get_realdev_name(const struct net_device *dev, char *result); +void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, + size_t size); int vlan_check_real_dev(struct net_device *real_dev, __be16 protocol, u16 vlan_id, diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c index 4db3f0621959..a0367b37512d 100644 --- a/net/8021q/vlan_dev.c +++ b/net/8021q/vlan_dev.c @@ -239,9 +239,9 @@ int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) return 0; } -void vlan_dev_get_realdev_name(const struct net_device *dev, char *result) +void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, size_t size) { - strncpy(result, vlan_dev_priv(dev)->real_dev->name, 23); + strscpy_pad(result, vlan_dev_priv(dev)->real_dev->name, size); } bool vlan_dev_inherit_address(struct net_device *dev, @@ -360,7 +360,7 @@ static int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) struct ifreq ifrr; int err = -EOPNOTSUPP; - strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ); + strscpy_pad(ifrr.ifr_name, real_dev->name, IFNAMSIZ); ifrr.ifr_ifru = ifr->ifr_ifru; switch (cmd) {