[PATCH v5 10/52] vhost: replace strerror with reentrant version

[Dengdui Huang <huangdengdui@huawei.com>]

The function strerror() is insecure in a multi-thread environment.
This patch uses strerror_r() to replace it.

Signed-off-by: Dengdui Huang <huangdengdui@huawei.com>
Acked-by: Chengwen Feng <fengchengwen@huawei.com>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Huisong Li <lihuisong@huawei.com>
---
 lib/vhost/fd_man.c     |  14 ++++--
 lib/vhost/socket.c     |  34 ++++++++++---
 lib/vhost/vduse.c      | 105 +++++++++++++++++++++++++++++++----------
 lib/vhost/vhost_user.c |  25 +++++++---
 4 files changed, 138 insertions(+), 40 deletions(-)

diff --git a/lib/vhost/fd_man.c b/lib/vhost/fd_man.c
index 9bc7e50b93..db913f8c1c 100644
--- a/lib/vhost/fd_man.c
+++ b/lib/vhost/fd_man.c
@@ -13,6 +13,7 @@
 #include <rte_malloc.h>
 #include <rte_string_fns.h>
 #include <rte_thread.h>
+#include <rte_errno.h>
 
 #include "fd_man.h"
 
@@ -212,6 +213,7 @@ fdset_find_entry_locked(struct fdset *pfdset, int fd)
 int
 fdset_add(struct fdset *pfdset, int fd, fd_cb rcb, fd_cb wcb, void *dat)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct epoll_event ev;
 	struct fdentry *pfdentry;
 	int ret = 0;
@@ -237,8 +239,10 @@ fdset_add(struct fdset *pfdset, int fd, fd_cb rcb, fd_cb wcb, void *dat)
 
 	ret = epoll_ctl(pfdset->epfd, EPOLL_CTL_ADD, fd, &ev);
 	if (ret < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_FDMAN_LOG(ERR, "could not add %d fd to %d epfd: %s",
-			fd, pfdset->epfd, strerror(errno));
+			fd, pfdset->epfd, errmsg);
 		goto out_remove;
 	}
 
@@ -256,13 +260,17 @@ fdset_add(struct fdset *pfdset, int fd, fd_cb rcb, fd_cb wcb, void *dat)
 static void
 fdset_del_locked(struct fdset *pfdset, struct fdentry *pfdentry)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
+
 	if (epoll_ctl(pfdset->epfd, EPOLL_CTL_DEL, pfdentry->fd, NULL) == -1) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		if (errno == EBADF) /* File might have already been closed. */
 			VHOST_FDMAN_LOG(DEBUG, "could not remove %d fd from %d epfd: %s",
-				pfdentry->fd, pfdset->epfd, strerror(errno));
+				pfdentry->fd, pfdset->epfd, errmsg);
 		else
 			VHOST_FDMAN_LOG(ERR, "could not remove %d fd from %d epfd: %s",
-				pfdentry->fd, pfdset->epfd, strerror(errno));
+				pfdentry->fd, pfdset->epfd, errmsg);
 	}
 
 	fdset_remove_entry(pfdset, pfdentry);
diff --git a/lib/vhost/socket.c b/lib/vhost/socket.c
index d29d15494c..96a9b84194 100644
--- a/lib/vhost/socket.c
+++ b/lib/vhost/socket.c
@@ -16,6 +16,7 @@
 
 #include <rte_thread.h>
 #include <rte_log.h>
+#include <rte_errno.h>
 
 #include "fd_man.h"
 #include "vduse.h"
@@ -105,6 +106,7 @@ read_fd_message(char *ifname, int sockfd, char *buf, int buflen, int *fds, int m
 	struct iovec iov;
 	struct msghdr msgh;
 	char control[CMSG_SPACE(max_fds * sizeof(int))];
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct cmsghdr *cmsg;
 	int got_fds = 0;
 	int ret;
@@ -122,9 +124,12 @@ read_fd_message(char *ifname, int sockfd, char *buf, int buflen, int *fds, int m
 
 	ret = recvmsg(sockfd, &msgh, 0);
 	if (ret <= 0) {
-		if (ret)
+		if (ret) {
+			if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 			VHOST_CONFIG_LOG(ifname, ERR, "recvmsg failed on fd %d (%s)",
-				sockfd, strerror(errno));
+				sockfd, errmsg);
+		}
 		return ret;
 	}
 
@@ -161,6 +166,7 @@ send_fd_message(char *ifname, int sockfd, char *buf, int buflen, int *fds, int f
 	struct msghdr msgh;
 	size_t fdsize = fd_num * sizeof(int);
 	char control[CMSG_SPACE(fdsize)];
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct cmsghdr *cmsg;
 	int ret;
 
@@ -194,8 +200,10 @@ send_fd_message(char *ifname, int sockfd, char *buf, int buflen, int *fds, int f
 	} while (ret < 0 && errno == EINTR);
 
 	if (ret < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(ifname, ERR, "sendmsg error on fd %d (%s)",
-			sockfd, strerror(errno));
+			sockfd, errmsg);
 		return ret;
 	}
 
@@ -341,6 +349,7 @@ static int
 create_unix_socket(struct vhost_user_socket *vsocket)
 {
 	int fd;
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct sockaddr_un *un = &vsocket->un;
 
 	fd = socket(AF_UNIX, SOCK_STREAM, 0);
@@ -350,9 +359,11 @@ create_unix_socket(struct vhost_user_socket *vsocket)
 		vsocket->is_server ? "server" : "client", fd);
 
 	if (!vsocket->is_server && fcntl(fd, F_SETFL, O_NONBLOCK)) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(vsocket->path, ERR,
 			"vhost-user: can't set nonblocking mode for socket, fd: %d (%s)",
-			fd, strerror(errno));
+			fd, errmsg);
 		close(fd);
 		return -1;
 	}
@@ -371,6 +382,7 @@ vhost_user_start_server(struct vhost_user_socket *vsocket)
 {
 	int ret;
 	int fd = vsocket->socket_fd;
+	char errmsg[RTE_STRERR_BUFSIZE];
 	const char *path = vsocket->path;
 
 	/*
@@ -385,8 +397,10 @@ vhost_user_start_server(struct vhost_user_socket *vsocket)
 	 */
 	ret = bind(fd, (struct sockaddr *)&vsocket->un, sizeof(vsocket->un));
 	if (ret < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(path, ERR, "failed to bind: %s; remove it and try again",
-			strerror(errno));
+			errmsg);
 		goto err;
 	}
 	VHOST_CONFIG_LOG(path, INFO, "binding succeeded");
@@ -430,6 +444,7 @@ static rte_thread_t reconn_tid;
 static int
 vhost_user_connect_nonblock(char *path, int fd, struct sockaddr *un, size_t sz)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	int ret, flags;
 
 	ret = connect(fd, un, sz);
@@ -438,8 +453,10 @@ vhost_user_connect_nonblock(char *path, int fd, struct sockaddr *un, size_t sz)
 
 	flags = fcntl(fd, F_GETFL, 0);
 	if (flags < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(path, ERR, "can't get flags for connfd %d (%s)",
-			fd, strerror(errno));
+			fd, errmsg);
 		return -2;
 	}
 	if ((flags & O_NONBLOCK) && fcntl(fd, F_SETFL, flags & ~O_NONBLOCK)) {
@@ -523,6 +540,7 @@ vhost_user_start_client(struct vhost_user_socket *vsocket)
 {
 	int ret;
 	int fd = vsocket->socket_fd;
+	char errmsg[RTE_STRERR_BUFSIZE];
 	const char *path = vsocket->path;
 	struct vhost_user_reconnect *reconn;
 
@@ -534,7 +552,9 @@ vhost_user_start_client(struct vhost_user_socket *vsocket)
 			return 0;
 		}
 
-		VHOST_CONFIG_LOG(path, WARNING, "failed to connect: %s", strerror(errno));
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
+		VHOST_CONFIG_LOG(path, WARNING, "failed to connect: %s", errmsg);
 
 		if (ret == -2 || !vsocket->reconnect) {
 			close(fd);
diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
index eaf3146b95..58bf065e66 100644
--- a/lib/vhost/vduse.c
+++ b/lib/vhost/vduse.c
@@ -17,6 +17,7 @@
 
 #include <rte_common.h>
 #include <rte_thread.h>
+#include <rte_errno.h>
 
 #include "fd_man.h"
 #include "iotlb.h"
@@ -119,14 +120,17 @@ static struct vhost_backend_ops vduse_backend_ops = {
 static void
 vduse_control_queue_event(int fd, void *arg, int *remove __rte_unused)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct virtio_net *dev = arg;
 	uint64_t buf;
 	int ret;
 
 	ret = read(fd, &buf, sizeof(buf));
 	if (ret < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to read control queue event: %s",
-				strerror(errno));
+				errmsg);
 		return;
 	}
 
@@ -142,13 +146,16 @@ vduse_vring_setup(struct virtio_net *dev, unsigned int index, bool reconnect)
 	struct vhost_vring_addr *ra = &vq->ring_addrs;
 	struct vduse_vq_info vq_info;
 	struct vduse_vq_eventfd vq_efd;
+	char errmsg[RTE_STRERR_BUFSIZE];
 	int ret;
 
 	vq_info.index = index;
 	ret = ioctl(dev->vduse_dev_fd, VDUSE_VQ_GET_INFO, &vq_info);
 	if (ret) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to get VQ %u info: %s",
-				index, strerror(errno));
+				index, errmsg);
 		return;
 	}
 
@@ -178,8 +185,10 @@ vduse_vring_setup(struct virtio_net *dev, unsigned int index, bool reconnect)
 	VHOST_CONFIG_LOG(dev->ifname, INFO, "\tready: %u", vq_info.ready);
 	vq->kickfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
 	if (vq->kickfd < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to init kickfd for VQ %u: %s",
-				index, strerror(errno));
+				index, errmsg);
 		vq->kickfd = VIRTIO_INVALID_EVENTFD;
 		return;
 	}
@@ -210,8 +219,10 @@ vduse_vring_setup(struct virtio_net *dev, unsigned int index, bool reconnect)
 
 	ret = ioctl(dev->vduse_dev_fd, VDUSE_VQ_SETUP_KICKFD, &vq_efd);
 	if (ret) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to setup kickfd for VQ %u: %s",
-				index, strerror(errno));
+				index, errmsg);
 		close(vq->kickfd);
 		vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
 		return;
@@ -220,9 +231,11 @@ vduse_vring_setup(struct virtio_net *dev, unsigned int index, bool reconnect)
 	if (vq == dev->cvq) {
 		ret = fdset_add(vduse.fdset, vq->kickfd, vduse_control_queue_event, NULL, dev);
 		if (ret) {
+			if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 			VHOST_CONFIG_LOG(dev->ifname, ERR,
 					"Failed to setup kickfd handler for VQ %u: %s",
-					index, strerror(errno));
+					index, errmsg);
 			vq_efd.fd = VDUSE_EVENTFD_DEASSIGN;
 			ioctl(dev->vduse_dev_fd, VDUSE_VQ_SETUP_KICKFD, &vq_efd);
 			close(vq->kickfd);
@@ -237,6 +250,7 @@ static void
 vduse_vring_cleanup(struct virtio_net *dev, unsigned int index)
 {
 	struct vhost_virtqueue *vq = dev->virtqueue[index];
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct vduse_vq_eventfd vq_efd;
 	int ret;
 
@@ -247,9 +261,12 @@ vduse_vring_cleanup(struct virtio_net *dev, unsigned int index)
 	vq_efd.fd = VDUSE_EVENTFD_DEASSIGN;
 
 	ret = ioctl(dev->vduse_dev_fd, VDUSE_VQ_SETUP_KICKFD, &vq_efd);
-	if (ret)
+	if (ret) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to cleanup kickfd for VQ %u: %s",
-				index, strerror(errno));
+				index, errmsg);
+	}
 
 	close(vq->kickfd);
 	vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
@@ -274,6 +291,7 @@ vduse_vring_cleanup(struct virtio_net *dev, unsigned int index)
 static void
 vduse_device_start(struct virtio_net *dev, bool reconnect)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	unsigned int i, ret;
 
 	VHOST_CONFIG_LOG(dev->ifname, INFO, "Starting device...");
@@ -287,8 +305,10 @@ vduse_device_start(struct virtio_net *dev, bool reconnect)
 
 	ret = ioctl(dev->vduse_dev_fd, VDUSE_DEV_GET_FEATURES, &dev->features);
 	if (ret) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to get features: %s",
-				strerror(errno));
+				errmsg);
 		return;
 	}
 
@@ -357,14 +377,17 @@ vduse_events_handler(int fd, void *arg, int *remove __rte_unused)
 	struct vduse_dev_response resp;
 	struct vhost_virtqueue *vq;
 	uint8_t old_status = dev->status;
+	char errmsg[RTE_STRERR_BUFSIZE];
 	int ret;
 
 	memset(&resp, 0, sizeof(resp));
 
 	ret = read(fd, &req, sizeof(req));
 	if (ret < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to read request: %s",
-				strerror(errno));
+				errmsg);
 		return;
 	} else if (ret < (int)sizeof(req)) {
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Incomplete to read request %d", ret);
@@ -406,8 +429,10 @@ vduse_events_handler(int fd, void *arg, int *remove __rte_unused)
 
 	ret = write(dev->vduse_dev_fd, &resp, sizeof(resp));
 	if (ret != sizeof(resp)) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to write response %s",
-				strerror(errno));
+				errmsg);
 		return;
 	}
 
@@ -428,6 +453,7 @@ static bool vduse_reconnect_path_set;
 static int
 vduse_reconnect_path_init(void)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	const char *directory;
 	int ret;
 
@@ -457,8 +483,10 @@ vduse_reconnect_path_init(void)
 
 	ret = mkdir(vduse_reconnect_dir, 0700);
 	if (ret < 0 && errno != EEXIST) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG("vduse", ERR, "Error creating '%s': %s",
-				vduse_reconnect_dir, strerror(errno));
+				vduse_reconnect_dir, errmsg);
 		return -1;
 	}
 
@@ -473,6 +501,7 @@ vduse_reconnect_path_init(void)
 static int
 vduse_reconnect_log_map(struct virtio_net *dev, bool create)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	char reco_file[PATH_MAX];
 	int fd, ret;
 	const char *name = dev->ifname + strlen("/dev/vduse/");
@@ -495,16 +524,20 @@ vduse_reconnect_log_map(struct virtio_net *dev, bool create)
 				VHOST_CONFIG_LOG(dev->ifname, ERR, "Reconnect file %s exists but not the device",
 						reco_file);
 			} else {
+				if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+					snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 				VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to open reconnect file %s (%s)",
-						reco_file, strerror(errno));
+						reco_file, errmsg);
 			}
 			return -1;
 		}
 
 		ret = ftruncate(fd, sizeof(*dev->reconnect_log));
 		if (ret < 0) {
+			if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 			VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to truncate reconnect file %s (%s)",
-					reco_file, strerror(errno));
+					reco_file, errmsg);
 			goto out_close;
 		}
 	} else {
@@ -512,9 +545,12 @@ vduse_reconnect_log_map(struct virtio_net *dev, bool create)
 		if (fd < 0) {
 			if (errno == ENOENT)
 				VHOST_CONFIG_LOG(dev->ifname, ERR, "Missing reconnect file (%s)", reco_file);
-			else
+			else {
+				if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+					snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 				VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to open reconnect file %s (%s)",
-						reco_file, strerror(errno));
+						reco_file, errmsg);
+			}
 			return -1;
 		}
 	}
@@ -522,8 +558,10 @@ vduse_reconnect_log_map(struct virtio_net *dev, bool create)
 	dev->reconnect_log = mmap(NULL, sizeof(*dev->reconnect_log), PROT_READ | PROT_WRITE,
 				MAP_SHARED, fd, 0);
 	if (dev->reconnect_log == MAP_FAILED) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to mmap reconnect file %s (%s)",
-				reco_file, strerror(errno));
+				reco_file, errmsg);
 		ret = -1;
 		goto out_close;
 	}
@@ -576,6 +614,7 @@ vduse_reconnect_handler(int fd, void *arg, int *remove)
 static int
 vduse_reconnect_start_device(struct virtio_net *dev)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	int fd, ret;
 
 	/*
@@ -584,8 +623,10 @@ vduse_reconnect_start_device(struct virtio_net *dev)
 	 */
 	fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
 	if (fd < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR, "Failed to create reconnect efd: %s",
-				strerror(errno));
+				errmsg);
 		ret = -1;
 		goto out_err;
 	}
@@ -624,6 +665,7 @@ vduse_device_create(const char *path, bool compliant_ol_flags)
 	uint64_t features;
 	const char *name = path + strlen("/dev/vduse/");
 	bool reconnect = false;
+	char errmsg[RTE_STRERR_BUFSIZE];
 
 	if (vduse.fdset == NULL) {
 		vduse.fdset = fdset_init("vduse-evt");
@@ -635,14 +677,18 @@ vduse_device_create(const char *path, bool compliant_ol_flags)
 
 	control_fd = open(VDUSE_CTRL_PATH, O_RDWR);
 	if (control_fd < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(name, ERR, "Failed to open %s: %s",
-				VDUSE_CTRL_PATH, strerror(errno));
+				VDUSE_CTRL_PATH, errmsg);
 		return -1;
 	}
 
 	if (ioctl(control_fd, VDUSE_SET_API_VERSION, &ver)) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(name, ERR, "Failed to set API version: %" PRIu64 ": %s",
-				ver, strerror(errno));
+				ver, errmsg);
 		ret = -1;
 		goto out_ctrl_close;
 	}
@@ -698,29 +744,37 @@ vduse_device_create(const char *path, bool compliant_ol_flags)
 		free(dev_config);
 		dev_config = NULL;
 		if (ret < 0) {
+			if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 			VHOST_CONFIG_LOG(name, ERR, "Failed to create VDUSE device: %s",
-					strerror(errno));
+					errmsg);
 			goto out_ctrl_close;
 		}
 
 		dev_fd = open(path, O_RDWR);
 		if (dev_fd < 0) {
+			if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 			VHOST_CONFIG_LOG(name, ERR, "Failed to open newly created device %s: %s",
-					path, strerror(errno));
+					path, errmsg);
 			ret = -1;
 			goto out_ctrl_close;
 		}
 	} else {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(name, ERR, "Failed to open device %s: %s",
-				path, strerror(errno));
+				path, errmsg);
 		ret = -1;
 		goto out_ctrl_close;
 	}
 
 	ret = fcntl(dev_fd, F_SETFL, O_NONBLOCK);
 	if (ret < 0) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(name, ERR, "Failed to set chardev as non-blocking: %s",
-				strerror(errno));
+				errmsg);
 		goto out_dev_close;
 	}
 
@@ -820,6 +874,7 @@ int
 vduse_device_destroy(const char *path)
 {
 	const char *name = path + strlen("/dev/vduse/");
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct virtio_net *dev;
 	int vid, ret;
 
@@ -853,8 +908,10 @@ vduse_device_destroy(const char *path)
 
 		ret = ioctl(dev->vduse_ctrl_fd, VDUSE_DESTROY_DEV, name);
 		if (ret) {
+			if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 			VHOST_CONFIG_LOG(name, ERR, "Failed to destroy VDUSE device: %s",
-					strerror(errno));
+					errmsg);
 		} else {
 			/*
 			 * VDUSE device was no more attached to the vDPA bus,
diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
index 6d92ad904e..6cde684a6e 100644
--- a/lib/vhost/vhost_user.c
+++ b/lib/vhost/vhost_user.c
@@ -829,10 +829,13 @@ mem_set_dump(struct virtio_net *dev, void *ptr, size_t size, bool enable, uint64
 	void *start = RTE_PTR_ALIGN_FLOOR(ptr, pagesz);
 	uintptr_t end = RTE_ALIGN_CEIL((uintptr_t)ptr + size, pagesz);
 	size_t len = end - (uintptr_t)start;
+	char errmsg[RTE_STRERR_BUFSIZE];
 
 	if (madvise(start, len, enable ? MADV_DODUMP : MADV_DONTDUMP) == -1) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, INFO,
-			"could not set coredump preference (%s).", strerror(errno));
+			"could not set coredump preference (%s).", errmsg);
 	}
 #endif
 }
@@ -1192,6 +1195,7 @@ vhost_user_postcopy_region_register(struct virtio_net *dev,
 		struct rte_vhost_mem_region *reg)
 {
 	struct uffdio_register reg_struct;
+	char errmsg[RTE_STRERR_BUFSIZE];
 
 	/*
 	 * Let's register all the mmapped area to ensure
@@ -1203,6 +1207,8 @@ vhost_user_postcopy_region_register(struct virtio_net *dev,
 
 	if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
 				&reg_struct)) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR,
 			"failed to register ufd for region "
 			"%" PRIx64 " - %" PRIx64 " (ufd = %d) %s",
@@ -1210,7 +1216,7 @@ vhost_user_postcopy_region_register(struct virtio_net *dev,
 			(uint64_t)reg_struct.range.start +
 			(uint64_t)reg_struct.range.len - 1,
 			dev->postcopy_ufd,
-			strerror(errno));
+			errmsg);
 		return -1;
 	}
 
@@ -1292,6 +1298,7 @@ vhost_user_mmap_region(struct virtio_net *dev,
 		struct rte_vhost_mem_region *region,
 		uint64_t mmap_offset)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	void *mmap_addr;
 	uint64_t mmap_size;
 	uint64_t alignment;
@@ -1339,7 +1346,9 @@ vhost_user_mmap_region(struct virtio_net *dev,
 			MAP_SHARED | populate, region->fd, 0);
 
 	if (mmap_addr == MAP_FAILED) {
-		VHOST_CONFIG_LOG(dev->ifname, ERR, "mmap failed (%s).", strerror(errno));
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
+		VHOST_CONFIG_LOG(dev->ifname, ERR, "mmap failed (%s).", errmsg);
 		return -1;
 	}
 
@@ -2770,21 +2779,25 @@ vhost_user_set_postcopy_advise(struct virtio_net **pdev,
 	struct virtio_net *dev = *pdev;
 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
 	struct uffdio_api api_struct;
+	char errmsg[RTE_STRERR_BUFSIZE];
 
 	dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
 
 	if (dev->postcopy_ufd == -1) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR,
-			"userfaultfd not available: %s",
-			strerror(errno));
+			"userfaultfd not available: %s", errmsg);
 		return RTE_VHOST_MSG_RESULT_ERR;
 	}
 	api_struct.api = UFFD_API;
 	api_struct.features = 0;
 	if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
 		VHOST_CONFIG_LOG(dev->ifname, ERR,
 			"UFFDIO_API ioctl failure: %s",
-			strerror(errno));
+			errmsg);
 		close(dev->postcopy_ufd);
 		dev->postcopy_ufd = -1;
 		return RTE_VHOST_MSG_RESULT_ERR;
-- 
2.33.0