[PATCH v5 32/52] net/failsafe: 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>
---
 drivers/net/failsafe/failsafe.c         | 13 ++++++++++---
 drivers/net/failsafe/failsafe_args.c    | 12 +++++++++---
 drivers/net/failsafe/failsafe_eal.c     |  5 ++++-
 drivers/net/failsafe/failsafe_ops.c     |  5 ++++-
 drivers/net/failsafe/failsafe_private.h | 17 +++++++++++++----
 5 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/drivers/net/failsafe/failsafe.c b/drivers/net/failsafe/failsafe.c
index 32811403b4..345dd13eff 100644
--- a/drivers/net/failsafe/failsafe.c
+++ b/drivers/net/failsafe/failsafe.c
@@ -135,21 +135,28 @@ fs_mutex_init(struct fs_priv *priv)
 {
 	int ret;
 	pthread_mutexattr_t attr;
+	char errmsg[RTE_STRERR_BUFSIZE];
 
 	ret = pthread_mutexattr_init(&attr);
 	if (ret) {
-		ERROR("Cannot initiate mutex attributes - %s", strerror(ret));
+		if (strerror_r(ret, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", ret);
+		ERROR("Cannot initiate mutex attributes - %s", errmsg);
 		return ret;
 	}
 	/* Allow mutex relocks for the thread holding the mutex. */
 	ret = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
 	if (ret) {
-		ERROR("Cannot set mutex type - %s", strerror(ret));
+		if (strerror_r(ret, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", ret);
+		ERROR("Cannot set mutex type - %s", errmsg);
 		return ret;
 	}
 	ret = pthread_mutex_init(&priv->hotplug_mutex, &attr);
 	if (ret) {
-		ERROR("Cannot initiate mutex - %s", strerror(ret));
+		if (strerror_r(ret, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", ret);
+		ERROR("Cannot initiate mutex - %s", errmsg);
 		return ret;
 	}
 	return 0;
diff --git a/drivers/net/failsafe/failsafe_args.c b/drivers/net/failsafe/failsafe_args.c
index 1b8f1d3050..fe53fecda8 100644
--- a/drivers/net/failsafe/failsafe_args.c
+++ b/drivers/net/failsafe/failsafe_args.c
@@ -89,6 +89,7 @@ fs_execute_cmd(struct sub_device *sdev, char *cmdline)
 	FILE *fp;
 	/* store possible newline as well */
 	char output[DEVARGS_MAXLEN + 1];
+	char errmsg[RTE_STRERR_BUFSIZE];
 	size_t len;
 	int ret;
 
@@ -112,7 +113,9 @@ fs_execute_cmd(struct sub_device *sdev, char *cmdline)
 	fp = popen(sdev->cmdline, "r");
 	if (fp == NULL) {
 		ret = -errno;
-		ERROR("popen: %s", strerror(errno));
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
+		ERROR("popen: %s", errmsg);
 		return ret;
 	}
 	/* We only read one line */
@@ -130,8 +133,11 @@ fs_execute_cmd(struct sub_device *sdev, char *cmdline)
 	if (ret)
 		ERROR("Parsing device '%s' failed", output);
 ret_pclose:
-	if (pclose(fp) == -1)
-		ERROR("pclose: %s", strerror(errno));
+	if (pclose(fp) == -1) {
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
+		ERROR("pclose: %s", errmsg);
+	}
 	return ret;
 }
 
diff --git a/drivers/net/failsafe/failsafe_eal.c b/drivers/net/failsafe/failsafe_eal.c
index e79d3b4120..8af72c6468 100644
--- a/drivers/net/failsafe/failsafe_eal.c
+++ b/drivers/net/failsafe/failsafe_eal.c
@@ -33,6 +33,7 @@ fs_ethdev_portid_get(const char *name, uint16_t *port_id)
 static int
 fs_bus_init(struct rte_eth_dev *dev)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct sub_device *sdev;
 	struct rte_devargs *da;
 	uint8_t i;
@@ -99,8 +100,10 @@ fs_bus_init(struct rte_eth_dev *dev)
 			      " %d named %s", i, da->name);
 			ret = rte_eth_dev_owner_set(pid, &PRIV(dev)->my_owner);
 			if (ret < 0) {
+				if (strerror_r(-ret, errmsg, sizeof(errmsg)) != 0)
+					snprintf(errmsg, sizeof(errmsg), "Unknown error %d", -ret);
 				INFO("sub_device %d owner set failed (%s), "
-				     "will try again later", i, strerror(-ret));
+				     "will try again later", i, errmsg);
 				continue;
 			} else if (strncmp(rte_eth_devices[pid].device->name,
 				   da->name, strlen(da->name)) != 0) {
diff --git a/drivers/net/failsafe/failsafe_ops.c b/drivers/net/failsafe/failsafe_ops.c
index 9c013e0419..f1734a5d36 100644
--- a/drivers/net/failsafe/failsafe_ops.c
+++ b/drivers/net/failsafe/failsafe_ops.c
@@ -409,6 +409,7 @@ fs_rx_queue_setup(struct rte_eth_dev *dev,
 		const struct rte_eth_rxconf *rx_conf,
 		struct rte_mempool *mb_pool)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	struct sub_device *sdev;
 	struct rxq *rxq;
 	uint8_t i;
@@ -452,7 +453,9 @@ fs_rx_queue_setup(struct rte_eth_dev *dev,
 #ifdef RTE_EXEC_ENV_LINUX
 	rxq->event_fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
 	if (rxq->event_fd < 0) {
-		ERROR("Failed to create an eventfd: %s", strerror(errno));
+		if (strerror_r(errno, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", errno);
+		ERROR("Failed to create an eventfd: %s", errmsg);
 		fs_unlock(dev, 0);
 		return -errno;
 	}
diff --git a/drivers/net/failsafe/failsafe_private.h b/drivers/net/failsafe/failsafe_private.h
index babea6016e..54ac39b87b 100644
--- a/drivers/net/failsafe/failsafe_private.h
+++ b/drivers/net/failsafe/failsafe_private.h
@@ -401,20 +401,25 @@ fs_dev(struct sub_device *sdev) {
 static inline int
 fs_lock(struct rte_eth_dev *dev, unsigned int is_alarm)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	int ret;
 
 	if (is_alarm) {
 		ret = pthread_mutex_trylock(&PRIV(dev)->hotplug_mutex);
 		if (ret) {
+			if (strerror_r(ret, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", ret);
 			DEBUG("Hot-plug mutex lock trying failed(%s), will try"
-			      " again later...", strerror(ret));
+			      " again later...", errmsg);
 			return ret;
 		}
 		PRIV(dev)->alarm_lock = 1;
 	} else {
 		ret = pthread_mutex_lock(&PRIV(dev)->hotplug_mutex);
 		if (ret) {
-			ERROR("Cannot lock mutex(%s)", strerror(ret));
+			if (strerror_r(ret, errmsg, sizeof(errmsg)) != 0)
+				snprintf(errmsg, sizeof(errmsg), "Unknown error %d", ret);
+			ERROR("Cannot lock mutex(%s)", errmsg);
 			return ret;
 		}
 	}
@@ -428,6 +433,7 @@ fs_lock(struct rte_eth_dev *dev, unsigned int is_alarm)
 static inline void
 fs_unlock(struct rte_eth_dev *dev, unsigned int is_alarm)
 {
+	char errmsg[RTE_STRERR_BUFSIZE];
 	int ret;
 
 	if (is_alarm) {
@@ -435,8 +441,11 @@ fs_unlock(struct rte_eth_dev *dev, unsigned int is_alarm)
 		PRIV(dev)->alarm_lock = 0;
 	}
 	ret = pthread_mutex_unlock(&PRIV(dev)->hotplug_mutex);
-	if (ret)
-		ERROR("Cannot unlock hot-plug mutex(%s)", strerror(ret));
+	if (ret) {
+		if (strerror_r(ret, errmsg, sizeof(errmsg)) != 0)
+			snprintf(errmsg, sizeof(errmsg), "Unknown error %d", ret);
+		ERROR("Cannot unlock hot-plug mutex(%s)", errmsg);
+	}
 }
 
 /*
-- 
2.33.0