From 175c71c2aceef173ae6d3dceb41edfc2ac0d5937 Mon Sep 17 00:00:00 2001 From: Olaf Hering Date: Sun, 8 Dec 2024 23:47:17 +0000 Subject: [PATCH] tools/hv: reduce resource usage in hv_kvp_daemon hv_kvp_daemon uses popen(3) and system(3) as convinience helper to launch external helpers. These helpers are invoked via a temporary shell process. There is no need to keep this temporary process around while the helper runs. Replace this temporary shell with the actual helper process via 'exec'. Signed-off-by: Olaf Hering Link: https://lore.kernel.org/linux-hyperv/20241202123520.27812-1-olaf@aepfle.de/ Signed-off-by: Wei Liu --- tools/hv/hv_kvp_daemon.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c index 296a7a62c54d..04ba035d67e9 100644 --- a/tools/hv/hv_kvp_daemon.c +++ b/tools/hv/hv_kvp_daemon.c @@ -725,7 +725,7 @@ static void kvp_get_ipconfig_info(char *if_name, * . */ - sprintf(cmd, KVP_SCRIPTS_PATH "%s %s", "hv_get_dns_info", if_name); + sprintf(cmd, "exec %s %s", KVP_SCRIPTS_PATH "hv_get_dns_info", if_name); /* * Execute the command to gather DNS info. @@ -742,7 +742,7 @@ static void kvp_get_ipconfig_info(char *if_name, * Enabled: DHCP enabled. */ - sprintf(cmd, KVP_SCRIPTS_PATH "%s %s", "hv_get_dhcp_info", if_name); + sprintf(cmd, "exec %s %s", KVP_SCRIPTS_PATH "hv_get_dhcp_info", if_name); file = popen(cmd, "r"); if (file == NULL) @@ -1606,8 +1606,9 @@ static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val) * invoke the external script to do its magic. */ - str_len = snprintf(cmd, sizeof(cmd), KVP_SCRIPTS_PATH "%s %s %s", - "hv_set_ifconfig", if_filename, nm_filename); + str_len = snprintf(cmd, sizeof(cmd), "exec %s %s %s", + KVP_SCRIPTS_PATH "hv_set_ifconfig", + if_filename, nm_filename); /* * This is a little overcautious, but it's necessary to suppress some * false warnings from gcc 8.0.1.