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From bea19fd9a86dd2c601681ff2ef4a9c1afab1e34d Mon Sep 17 00:00:00 2001
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From: Jan Macku <jamacku@redhat.com>
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Date: Tue, 8 Jun 2021 15:41:58 +0200
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Subject: [PATCH] ifenslave: fix CWE-170: Improper Null Termination
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Resolves: #1938746
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---
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ifenslave.c | 43 +++++++++++++++++++++++++++----------------
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1 file changed, 27 insertions(+), 16 deletions(-)
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diff --git a/ifenslave.c b/ifenslave.c
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index 1efe4f1..59bce4c 100644
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--- a/ifenslave.c
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+++ b/ifenslave.c
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@@ -619,7 +619,7 @@ static int get_drv_info(char *master_ifname)
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char *endptr;
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memset(&ifr, 0, sizeof(ifr));
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- strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ - 1);
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ifr.ifr_data = (caddr_t)&info;
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info.cmd = ETHTOOL_GDRVINFO;
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@@ -664,8 +664,9 @@ static int change_active(char *master_ifname, char *slave_ifname)
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return 1;
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}
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- strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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- strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
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+ memset(&ifr, 0, sizeof(ifr));
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+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ - 1);
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+ strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ - 1);
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if ((ioctl(skfd, SIOCBONDCHANGEACTIVE, &ifr) < 0) &&
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(ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &ifr) < 0)) {
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saved_errno = errno;
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@@ -806,8 +807,9 @@ static int enslave(char *master_ifname, char *slave_ifname)
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}
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/* Do the real thing */
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- strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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- strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
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+ memset(&ifr, 0, sizeof(ifr));
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+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ - 1);
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+ strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ - 1);
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if ((ioctl(skfd, SIOCBONDENSLAVE, &ifr) < 0) &&
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(ioctl(skfd, BOND_ENSLAVE_OLD, &ifr) < 0)) {
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saved_errno = errno;
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@@ -847,8 +849,9 @@ static int release(char *master_ifname, char *slave_ifname)
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return 1;
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}
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- strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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- strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ);
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+ memset(&ifr, 0, sizeof(ifr));
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+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ - 1);
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+ strncpy(ifr.ifr_slave, slave_ifname, IFNAMSIZ - 1);
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if ((ioctl(skfd, SIOCBONDRELEASE, &ifr) < 0) &&
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(ioctl(skfd, BOND_RELEASE_OLD, &ifr) < 0)) {
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saved_errno = errno;
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@@ -880,7 +883,8 @@ static int get_if_settings(char *ifname, struct dev_ifr ifra[])
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int res = 0;
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for (i = 0; ifra[i].req_ifr; i++) {
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- strncpy(ifra[i].req_ifr->ifr_name, ifname, IFNAMSIZ);
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+ strncpy(ifra[i].req_ifr->ifr_name, ifname, IFNAMSIZ - 1);
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+ ifra[i].req_ifr->ifr_name[IFNAMSIZ - 1] = '\0';
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res = ioctl(skfd, ifra[i].req_type, ifra[i].req_ifr);
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if (res < 0) {
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saved_errno = errno;
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@@ -899,7 +903,8 @@ static int get_slave_flags(char *slave_ifname)
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{
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int res = 0;
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- strncpy(slave_flags.ifr_name, slave_ifname, IFNAMSIZ);
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+ strncpy(slave_flags.ifr_name, slave_ifname, IFNAMSIZ - 1);
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+ slave_flags.ifr_name[IFNAMSIZ - 1] = '\0';
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res = ioctl(skfd, SIOCGIFFLAGS, &slave_flags);
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if (res < 0) {
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saved_errno = errno;
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@@ -919,7 +924,8 @@ static int set_master_hwaddr(char *master_ifname, struct sockaddr *hwaddr)
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struct ifreq ifr;
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int res = 0;
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- strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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+ memset(&ifr, 0, sizeof(ifr));
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+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ - 1);
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memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
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res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
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if (res < 0) {
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@@ -943,7 +949,8 @@ static int set_slave_hwaddr(char *slave_ifname, struct sockaddr *hwaddr)
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struct ifreq ifr;
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int res = 0;
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- strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
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+ memset(&ifr, 0, sizeof(ifr));
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+ strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ - 1);
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memcpy(&(ifr.ifr_hwaddr), hwaddr, sizeof(struct sockaddr));
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res = ioctl(skfd, SIOCSIFHWADDR, &ifr);
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if (res < 0) {
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@@ -980,8 +987,9 @@ static int set_slave_mtu(char *slave_ifname, int mtu)
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struct ifreq ifr;
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int res = 0;
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+ memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_mtu = mtu;
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- strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
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+ strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ - 1);
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res = ioctl(skfd, SIOCSIFMTU, &ifr);
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if (res < 0) {
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@@ -1000,8 +1008,9 @@ static int set_if_flags(char *ifname, short flags)
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struct ifreq ifr;
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int res = 0;
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+ memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = flags;
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- strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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+ strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
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res = ioctl(skfd, SIOCSIFFLAGS, &ifr);
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if (res < 0) {
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@@ -1030,7 +1039,8 @@ static int clear_if_addr(char *ifname)
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struct ifreq ifr;
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int res = 0;
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- strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
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+ memset(&ifr, 0, sizeof(ifr));
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+ strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
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ifr.ifr_addr.sa_family = AF_INET;
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memset(ifr.ifr_addr.sa_data, 0, sizeof(ifr.ifr_addr.sa_data));
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@@ -1065,8 +1075,9 @@ static int set_if_addr(char *master_ifname, char *slave_ifname)
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{NULL, NULL, 0, 0},
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};
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+ memset(&ifr, 0, sizeof(ifr));
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for (i = 0; ifra[i].req_name; i++) {
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- strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ);
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+ strncpy(ifr.ifr_name, master_ifname, IFNAMSIZ - 1);
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res = ioctl(skfd, ifra[i].g_ioctl, &ifr);
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if (res < 0) {
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int saved_errno = errno;
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@@ -1080,7 +1091,7 @@ static int set_if_addr(char *master_ifname, char *slave_ifname)
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sizeof(ifr.ifr_addr.sa_data));
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}
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- strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ);
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+ strncpy(ifr.ifr_name, slave_ifname, IFNAMSIZ - 1);
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res = ioctl(skfd, ifra[i].s_ioctl, &ifr);
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if (res < 0) {
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int saved_errno = errno;
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--
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2.31.1
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