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tools/hv: reduce resource usage in hv_kvp_daemon

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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 <olaf@aepfle.de>
Link: https://lore.kernel.org/linux-hyperv/20241202123520.27812-1-olaf@aepfle.de/
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Olaf Hering 2024-12-08 23:47:17 +00:00 committed by Wei Liu
parent becc7fe329
commit 175c71c2ac
1 changed files with 5 additions and 4 deletions
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9
tools/hv/hv_kvp_daemon.c
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@ -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.