[dpdk-dev] [PATCH v2] examples/vm_power: fix strcpy buffer overrun

[David Hunt]

replace strcpy with strlcpy to prevent buffer overrun
With fix, attempting to use a VERY lonng vm name results in a nicely
truncated 32 character name rather than a segfault:
Setting VM Name to [sdfdsfsfsdffdsdsasdsadasdakjshd]

Using strlcpy rather than rte_strlcpy, as the rte_ version is only a
fallback.

As well as the fix in main.c, this patch also changes an occurrence of
rte_strlcpy in channel_manager.c and channel_monitor.c to strlcpy.

Fixes: 59287933a0bb ("examples/vm_power: add options to guest app")
Cc: sta...@dpdk.org
Signed-off-by: David Hunt <david.h...@intel.com>
Acked-by: Anatoly Burakov <anatoly.bura...@intel.com>
---
 examples/vm_power_manager/channel_manager.c | 2 +-
 examples/vm_power_manager/channel_monitor.c | 2 +-
 examples/vm_power_manager/guest_cli/main.c  | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/examples/vm_power_manager/channel_manager.c 
b/examples/vm_power_manager/channel_manager.c
index 2c1332257..4db225755 100644
--- a/examples/vm_power_manager/channel_manager.c
+++ b/examples/vm_power_manager/channel_manager.c
@@ -588,7 +588,7 @@ add_host_channels(void)
                        goto error;
                }
                chan_infos[i] = chan_info;
-               rte_strlcpy(chan_info->channel_path, socket_path,
+               strlcpy(chan_info->channel_path, socket_path,
                                sizeof(chan_info->channel_path));
 
                if (setup_host_channel_info(&chan_info, i) < 0) {
diff --git a/examples/vm_power_manager/channel_monitor.c 
b/examples/vm_power_manager/channel_monitor.c
index 9d7474da0..496772f8a 100644
--- a/examples/vm_power_manager/channel_monitor.c
+++ b/examples/vm_power_manager/channel_monitor.c
@@ -309,7 +309,7 @@ parse_json_to_pkt(json_t *element, struct channel_packet 
*pkt,
                                vm_name);
                        return -1;
                }
-               rte_strlcpy(pkt->vm_name, vm_name, VM_MAX_NAME_SZ);
+               strlcpy(pkt->vm_name, vm_name, VM_MAX_NAME_SZ);
                pkt->resource_id = resource_id;
        }
        return 0;
diff --git a/examples/vm_power_manager/guest_cli/main.c 
b/examples/vm_power_manager/guest_cli/main.c
index 36365b124..a18eb214a 100644
--- a/examples/vm_power_manager/guest_cli/main.c
+++ b/examples/vm_power_manager/guest_cli/main.c
@@ -65,7 +65,7 @@ parse_args(int argc, char **argv)
                switch (opt) {
                /* portmask */
                case 'n':
-                       strcpy(policy->vm_name, optarg);
+                       rte_strlcpy(policy->vm_name, optarg, VM_MAX_NAME_SZ);
                        printf("Setting VM Name to [%s]\n", policy->vm_name);
                        break;
                case 'b':
-- 
2.17.1