[PATCH 0/3] examples: format truncation bugs

[PATCH 0/3] examples: format truncation bugs

[Stephen Hemminger]

Enable format-overflow warnings in examples and fix the bugs.

Stephen Hemminger (3):
  examples/server_node_efd: fix format overflow
  examples/vdpa: fix format overflow warning
  examples: re-enable format truncation warning

 examples/meson.build                       |  5 ++---
 examples/server_node_efd/efd_server/main.c |  2 +-
 examples/vdpa/main.c                       | 12 ++++++------
 3 files changed, 9 insertions(+), 10 deletions(-)

-- 
2.51.0

[PATCH 1/3] examples/server_node_efd: fix format overflow

[Stephen Hemminger]

If format-truncation is enabled, the compiler detects a string overflow
since the snprintf() is putting ethernet address and new line
in buffer only sized for the address.

Fixes: 39aad0e88c58 ("examples/flow_distributor: new example to demonstrate EFD")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/server_node_efd/efd_server/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/server_node_efd/efd_server/main.c b/examples/server_node_efd/efd_server/main.c
index 75ff0ea532..62c3f4a16d 100644
--- a/examples/server_node_efd/efd_server/main.c
+++ b/examples/server_node_efd/efd_server/main.c
@@ -68,7 +68,7 @@ static const char *
 get_printable_mac_addr(uint16_t port)
 {
 	static const char err_address[] = "00:00:00:00:00:00";
-	static char addresses[RTE_MAX_ETHPORTS][sizeof(err_address)];
+	static char addresses[RTE_MAX_ETHPORTS][RTE_ETHER_ADDR_FMT_SIZE + 1];
 	struct rte_ether_addr mac;
 	int ret;
 
-- 
2.51.0

[PATCH 2/3] examples/vdpa: fix format overflow warning

[Stephen Hemminger]

The ifname is limited to 128 characters, but it would allow up
to 128 characters as prefix then could overflow creating ifname.

Change to limit path prefix to 124 (128 - sizeof("1024"))
to avoid possible format overflow

Fixes: 38f8ab0bbc8d ("vhost: make vDPA framework bus agnostic")
Cc: maxime.coquelin@redhat.com
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/vdpa/main.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/examples/vdpa/main.c b/examples/vdpa/main.c
index 289db26498..bdf751ad63 100644
--- a/examples/vdpa/main.c
+++ b/examples/vdpa/main.c
@@ -22,6 +22,8 @@
 
 #define MAX_PATH_LEN 128
 #define MAX_VDPA_SAMPLE_PORTS 1024
+#define stringify(x) (#x)
+#define MAX_VDPA_STR_LEN sizeof(stringify(MAX_VDPA_SAMPLE_PORTS))
 #define RTE_LOGTYPE_VDPA RTE_LOGTYPE_USER1
 
 struct vdpa_port {
@@ -36,7 +38,7 @@ struct vdpa_port {
 
 static struct vdpa_port vports[MAX_VDPA_SAMPLE_PORTS];
 
-static char iface[MAX_PATH_LEN];
+static char iface[MAX_PATH_LEN - MAX_VDPA_STR_LEN];
 static int devcnt;
 static int interactive;
 static int client_mode;
@@ -74,9 +76,8 @@ parse_args(int argc, char **argv)
 			break;
 		/* long options */
 		case 0:
-			if (strncmp(long_option[idx].name, "iface",
-						MAX_PATH_LEN) == 0) {
-				rte_strscpy(iface, optarg, MAX_PATH_LEN);
+			if (!strcmp(long_option[idx].name, "iface")) {
+				rte_strscpy(iface, optarg, sizeof(iface));
 				printf("iface %s\n", iface);
 			}
 			if (!strcmp(long_option[idx].name, "interactive")) {
-- 
2.51.0

[PATCH 3/3] examples: re-enable format truncation warning

[Stephen Hemminger]

There were several hidden bugs in examples because format
truncation warning was disabled.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/meson.build | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/examples/meson.build b/examples/meson.build
index 8e8968a1fa..25d9c88457 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -78,10 +78,9 @@ else
     examples = get_option('examples').split(',')
     allow_skips = false # error out if we can't build a requested app
 endif
+
 default_cflags = machine_args
-if cc.has_argument('-Wno-format-truncation')
-    default_cflags += '-Wno-format-truncation'
-endif
+
 default_ldflags = dpdk_extra_ldflags
 if get_option('default_library') == 'static' and not is_windows
     default_ldflags += ['-Wl,--export-dynamic']
-- 
2.51.0

[PATCH v2 0/7] fix format-truncation warnings

[Stephen Hemminger]

Enable and fix format-truncation warnings in examples and tests.

v2 - fix build warnings (more fixes needed)
   - do test as well (could be separate series?)

Stephen Hemminger (7):
  examples/server_node_efd: fix format overflow
  examples/vdpa: fix format overflow warning
  examples/ip_reassembly: add check before formatting name
  examples: re-enable format truncation warning
  test: refactor file prefix arg handling
  test: increase size of memzone name
  test: re-enable format-truncation warnings

 app/test/meson.build                       |   1 -
 app/test/test_eal_flags.c                  | 161 ++++++++-------------
 app/test/test_memzone.c                    |   2 +-
 examples/ip_reassembly/main.c              |   7 +
 examples/meson.build                       |   5 +-
 examples/server_node_efd/efd_server/main.c |   2 +-
 examples/server_node_efd/shared/common.h   |   3 +-
 examples/vdpa/main.c                       |   9 +-
 8 files changed, 77 insertions(+), 113 deletions(-)

-- 
2.51.0

[PATCH v2 1/7] examples/server_node_efd: fix format overflow

[Stephen Hemminger]

If format-truncation is enabled, the compiler detects a string overflow
since the snprintf() is putting ethernet address and new line
in buffer only sized for the address.

Since get_rx_queue_name() is used to create a ring name.
The buffer should be sized to be a valid ring name.
This fixes some format-overflow warnings and also corrects
for future errors.

Fixes: 39aad0e88c58 ("examples/flow_distributor: new example to demonstrate EFD")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/server_node_efd/efd_server/main.c | 2 +-
 examples/server_node_efd/shared/common.h   | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/examples/server_node_efd/efd_server/main.c b/examples/server_node_efd/efd_server/main.c
index 75ff0ea532..62c3f4a16d 100644
--- a/examples/server_node_efd/efd_server/main.c
+++ b/examples/server_node_efd/efd_server/main.c
@@ -68,7 +68,7 @@ static const char *
 get_printable_mac_addr(uint16_t port)
 {
 	static const char err_address[] = "00:00:00:00:00:00";
-	static char addresses[RTE_MAX_ETHPORTS][sizeof(err_address)];
+	static char addresses[RTE_MAX_ETHPORTS][RTE_ETHER_ADDR_FMT_SIZE + 1];
 	struct rte_ether_addr mac;
 	int ret;
 
diff --git a/examples/server_node_efd/shared/common.h b/examples/server_node_efd/shared/common.h
index e1ab7e62b7..6726e2031e 100644
--- a/examples/server_node_efd/shared/common.h
+++ b/examples/server_node_efd/shared/common.h
@@ -58,8 +58,9 @@ get_rx_queue_name(unsigned int id)
 	/*
 	 * Buffer for return value. Size calculated by %u being replaced
 	 * by maximum 3 digits (plus an extra byte for safety)
+	 * Used as ring name, so upper limit is ring name size.
 	 */
-	static char buffer[sizeof(MP_NODE_RXQ_NAME) + 2];
+	static char buffer[RTE_RING_NAMESIZE];
 
 	snprintf(buffer, sizeof(buffer), MP_NODE_RXQ_NAME, id);
 	return buffer;
-- 
2.51.0

[PATCH v2 2/7] examples/vdpa: fix format overflow warning

[Stephen Hemminger]

The ifname is limited to 128 characters, but it would allow up
to 128 characters as prefix then could overflow creating ifname.

Change to limit path prefix to 124 (128 - sizeof("1024"))
to avoid possible format overflow

Fixes: 38f8ab0bbc8d ("vhost: make vDPA framework bus agnostic")
Cc: maxime.coquelin@redhat.com
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/vdpa/main.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/examples/vdpa/main.c b/examples/vdpa/main.c
index 289db26498..7fd0e55b20 100644
--- a/examples/vdpa/main.c
+++ b/examples/vdpa/main.c
@@ -22,6 +22,8 @@
 
 #define MAX_PATH_LEN 128
 #define MAX_VDPA_SAMPLE_PORTS 1024
+#define stringify(x) (#x)
+#define MAX_VDPA_STR_LEN sizeof(stringify(MAX_VDPA_SAMPLE_PORTS))
 #define RTE_LOGTYPE_VDPA RTE_LOGTYPE_USER1
 
 struct vdpa_port {
@@ -36,7 +38,7 @@ struct vdpa_port {
 
 static struct vdpa_port vports[MAX_VDPA_SAMPLE_PORTS];
 
-static char iface[MAX_PATH_LEN];
+static char iface[MAX_PATH_LEN - MAX_VDPA_STR_LEN];
 static int devcnt;
 static int interactive;
 static int client_mode;
@@ -74,9 +76,8 @@ parse_args(int argc, char **argv)
 			break;
 		/* long options */
 		case 0:
-			if (strncmp(long_option[idx].name, "iface",
-						MAX_PATH_LEN) == 0) {
-				rte_strscpy(iface, optarg, MAX_PATH_LEN);
+			if (!strcmp(long_option[idx].name, "iface")) {
+				rte_strscpy(iface, optarg, sizeof(iface));
 				printf("iface %s\n", iface);
 			}
 			if (!strcmp(long_option[idx].name, "interactive")) {
-- 
2.51.0

[PATCH v2 3/7] examples/ip_reassembly: add check before formatting name

[Stephen Hemminger]

In theory, lcore and queue could be so large that mbuf pool name
could overflow. But that can never happen since lcore and queue
will be in range. Add a check so that static tools know that.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/ip_reassembly/main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/examples/ip_reassembly/main.c b/examples/ip_reassembly/main.c
index 17ae76d4ba..25b904dbd4 100644
--- a/examples/ip_reassembly/main.c
+++ b/examples/ip_reassembly/main.c
@@ -884,6 +884,13 @@ setup_queue_tbl(struct rx_queue *rxq, uint32_t lcore, uint32_t queue)
 
 	nb_mbuf = RTE_MAX(nb_mbuf, (uint32_t)NB_MBUF);
 
+	/* Should never happen but check so that pool name won't be too long. */
+	if (lcore > RTE_MAX_LCORE || queue > RTE_MAX_QUEUES_PER_PORT) {
+		RTE_LOG(ERR, IP_RSMBL, "invalid lcore %u or queue %u",
+			lcore, queue);
+		return -1;
+	}
+
 	snprintf(buf, sizeof(buf), "mbuf_pool_%u_%u", lcore, queue);
 
 	rxq->pool = rte_pktmbuf_pool_create(buf, nb_mbuf, MEMPOOL_CACHE_SIZE, 0,
-- 
2.51.0

[PATCH v2 4/7] examples: re-enable format truncation warning

[Stephen Hemminger]

There were several hidden bugs in examples because format
truncation warning was disabled.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 examples/meson.build | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/examples/meson.build b/examples/meson.build
index 8e8968a1fa..25d9c88457 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -78,10 +78,9 @@ else
     examples = get_option('examples').split(',')
     allow_skips = false # error out if we can't build a requested app
 endif
+
 default_cflags = machine_args
-if cc.has_argument('-Wno-format-truncation')
-    default_cflags += '-Wno-format-truncation'
-endif
+
 default_ldflags = dpdk_extra_ldflags
 if get_option('default_library') == 'static' and not is_windows
     default_ldflags += ['-Wl,--export-dynamic']
-- 
2.51.0

[PATCH v2 5/7] test: refactor file prefix arg handling

[Stephen Hemminger]

Make setting up --file-prefix arg logic into a function,
and avoid impossible case of file prefix path causing overflow
of string.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 app/test/test_eal_flags.c | 161 ++++++++++++++------------------------
 1 file changed, 59 insertions(+), 102 deletions(-)

diff --git a/app/test/test_eal_flags.c b/app/test/test_eal_flags.c
index e32f83d3c8..05b4135a51 100644
--- a/app/test/test_eal_flags.c
+++ b/app/test/test_eal_flags.c
@@ -121,6 +121,8 @@ test_misc_flags(void)
 #define no_shconf "--no-shconf"
 #define allow "--allow"
 #define vdev "--vdev"
+#define file_prefix "--file-prefix"
+
 #define memtest "memtest"
 #define memtest1 "memtest1"
 #define memtest2 "memtest2"
@@ -312,26 +314,40 @@ get_number_of_sockets(void)
 }
 #endif
 
-/*
- * Test that the app doesn't run with invalid allow option.
- * Final tests ensures it does run with valid options as sanity check (one
- * test for with Domain+BDF, second for just with BDF)
- */
+/* Get the file_prefix xommand line argument */
 static int
-test_allow_flag(void)
+get_file_prefix(char *prefix, size_t size)
 {
-	unsigned i;
 #ifdef RTE_EXEC_ENV_FREEBSD
 	/* BSD target doesn't support prefixes at this point */
-	const char * prefix = "";
+	RTE_SET_USED(len);
+	*prefix = 0;
+	return 0;
 #else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
+	char tmp[PATH_MAX];
+
 	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
 		printf("Error - unable to get current prefix!\n");
 		return -1;
 	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
+	snprintf(prefix, size, "%s=%s", file_prefix, tmp);
+	return 0;
 #endif
+}
+
+/*
+ * Test that the app doesn't run with invalid allow option.
+ * Final tests ensures it does run with valid options as sanity check (one
+ * test for with Domain+BDF, second for just with BDF)
+ */
+static int
+test_allow_flag(void)
+{
+	unsigned i;
+	char prefix[PATH_MAX + sizeof(file_prefix)];
+
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	const char *wlinval[][7] = {
 		{prgname, prefix, mp_flag,
@@ -387,17 +403,10 @@ test_allow_flag(void)
 static int
 test_invalid_b_flag(void)
 {
-#ifdef RTE_EXEC_ENV_FREEBSD
-	/* BSD target doesn't support prefixes at this point */
-	const char * prefix = "";
-#else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif
+	char prefix[PATH_MAX + sizeof(file_prefix)];
+
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	const char *blinval[][5] = {
 		{prgname, prefix, mp_flag, "-b", "error"},
@@ -491,17 +500,10 @@ test_invalid_vdev_flag(void)
 static int
 test_invalid_r_flag(void)
 {
-#ifdef RTE_EXEC_ENV_FREEBSD
-	/* BSD target doesn't support prefixes at this point */
-	const char * prefix = "";
-#else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif
+	char prefix[PATH_MAX + sizeof(file_prefix)];
+
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	const char *rinval[][5] = {
 			{prgname, prefix, mp_flag, "-r", "error"},
@@ -535,17 +537,10 @@ test_invalid_r_flag(void)
 static int
 test_missing_c_flag(void)
 {
-#ifdef RTE_EXEC_ENV_FREEBSD
-	/* BSD target doesn't support prefixes at this point */
-	const char * prefix = "";
-#else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif
+	char prefix[PATH_MAX + sizeof(file_prefix)];
+
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	/* -c flag but no coremask value */
 	const char *argv1[] = { prgname, prefix, mp_flag, "-c"};
@@ -694,17 +689,10 @@ test_missing_c_flag(void)
 static int
 test_main_lcore_flag(void)
 {
-#ifdef RTE_EXEC_ENV_FREEBSD
-	/* BSD target doesn't support prefixes at this point */
-	const char *prefix = "";
-#else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif
+	char prefix[PATH_MAX + sizeof(file_prefix)];
+
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	if (!rte_lcore_is_enabled(0) || !rte_lcore_is_enabled(1))
 		return TEST_SKIPPED;
@@ -751,17 +739,10 @@ test_main_lcore_flag(void)
 static int
 test_invalid_n_flag(void)
 {
-#ifdef RTE_EXEC_ENV_FREEBSD
-	/* BSD target doesn't support prefixes at this point */
-	const char * prefix = "";
-#else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif
+	char prefix[PATH_MAX + sizeof(file_prefix)];
+
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	/* -n flag but no value */
 	const char *argv1[] = { prgname, prefix, no_huge, no_shconf,
@@ -803,18 +784,10 @@ test_invalid_n_flag(void)
 static int
 test_no_hpet_flag(void)
 {
-	char prefix[PATH_MAX] = "";
+	char prefix[PATH_MAX + sizeof(file_prefix)];
 
-#ifdef RTE_EXEC_ENV_FREEBSD
-	return 0;
-#else
-	char tmp[PATH_MAX];
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	/* With --no-hpet */
 	const char *argv1[] = {prgname, prefix, mp_flag, no_hpet};
@@ -913,17 +886,14 @@ test_misc_flags(void)
 	const char * prefix = "";
 	const char * nosh_prefix = "";
 #else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
+	char prefix[PATH_MAX + sizeof(file_prefix)];
 	const char * nosh_prefix = "--file-prefix=noshconf";
 	FILE * hugedir_handle = NULL;
 	char line[PATH_MAX] = {0};
 	unsigned i, isempty = 1;
 
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	/*
 	 * get first valid hugepage path
@@ -1239,16 +1209,10 @@ test_file_prefix(void)
 	 *    run in legacy mode, and not present at all after run in default
 	 *    mem mode
 	 */
-	char prefix[PATH_MAX] = "";
+	char prefix[PATH_MAX + sizeof(file_prefix)];
 
-#ifdef RTE_EXEC_ENV_FREEBSD
-	return 0;
-#else
-	if (get_current_prefix(prefix, sizeof(prefix)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-#endif
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	/* this should fail unless the test itself is run with "memtest" prefix */
 	const char *argv0[] = {prgname, mp_flag, "-m",
@@ -1525,17 +1489,10 @@ populate_socket_mem_param(int num_sockets, const char *mem,
 static int
 test_memory_flags(void)
 {
-#ifdef RTE_EXEC_ENV_FREEBSD
-	/* BSD target doesn't support prefixes at this point */
-	const char * prefix = "";
-#else
-	char prefix[PATH_MAX], tmp[PATH_MAX];
-	if (get_current_prefix(tmp, sizeof(tmp)) == NULL) {
-		printf("Error - unable to get current prefix!\n");
-		return -1;
-	}
-	snprintf(prefix, sizeof(prefix), "--file-prefix=%s", tmp);
-#endif
+	char prefix[PATH_MAX + sizeof(file_prefix)];
+
+	if (get_file_prefix(prefix, sizeof(prefix)) != 0)
+		return TEST_FAILED;
 
 	/* valid -m flag and mp flag */
 	const char *argv0[] = {prgname, prefix, mp_flag,
-- 
2.51.0

[PATCH v2 6/7] test: increase size of memzone name

[Stephen Hemminger]

The tests were using a name buffer of 20 characters which could
overflow if number of memory zones got large. The upper limit
is defined as RTE_MEMZONE_NAMESIZE so use that.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 app/test/test_memzone.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/test/test_memzone.c b/app/test/test_memzone.c
index 506725ea41..6586dad18d 100644
--- a/app/test/test_memzone.c
+++ b/app/test/test_memzone.c
@@ -872,7 +872,7 @@ test_memzone_free(void)
 {
 	const struct rte_memzone **mz;
 	int i;
-	char name[20];
+	char name[RTE_MEMZONE_NAMESIZE];
 	int rc = -1;
 
 	mz = rte_calloc("memzone_test", rte_memzone_max_get() + 1,
-- 
2.51.0

[PATCH v2 7/7] test: re-enable format-truncation warnings

[Stephen Hemminger]

Tests should be built with warnings.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 app/test/meson.build | 1 -
 1 file changed, 1 deletion(-)

diff --git a/app/test/meson.build b/app/test/meson.build
index 8df8d3edd1..66cbabe9fe 100644
--- a/app/test/meson.build
+++ b/app/test/meson.build
@@ -260,7 +260,6 @@ cflags += no_wvla_cflag
 extra_flags = [
         # Strict-aliasing rules are violated by uint8_t[] to context size casts.
         '-fno-strict-aliasing',
-        '-Wno-format-truncation',
 ]
 
 foreach arg: extra_flags
-- 
2.51.0