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Tools: hv: fix send/recv buffer allocation 

hv_kvp_daemon fails to start in current openSuSE 13.1 snapshots because
the kvp_send_buffer is too small to hold cn_msg+hv_kvp_msg, the very
first sendmsg returns with EFAULT. In addition it fixes the Network info
tab in Windows Server 2012R2 in SLES11.

Adjust the code in kvp and vss daemon to allocate the needed buffers at
runtime. To keep the code simple, the buffer_len includes also the
nlmsghdr, although only the recv_buffer needs this extra space.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Olaf Hering 2013-08-01 14:34:26 +02:00 committed by Greg Kroah-Hartman
parent cfc25993e8
commit b4919a5f95
2 changed files with 24 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
tools/hv/hv_kvp_daemon.c
View File

@ -79,8 +79,6 @@ enum {
DNS
};
static char kvp_send_buffer[4096];
static char kvp_recv_buffer[4096 * 2];
static struct sockaddr_nl addr;
static int in_hand_shake = 1;
@ -1437,10 +1435,21 @@ int main(void)
int pool;
char *if_name;
struct hv_kvp_ipaddr_value *kvp_ip_val;
char *kvp_send_buffer;
char *kvp_recv_buffer;
size_t kvp_recv_buffer_len;
daemon(1, 0);
openlog("KVP", 0, LOG_USER);
syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
kvp_recv_buffer_len = NLMSG_HDRLEN + sizeof(struct cn_msg) + sizeof(struct hv_kvp_msg);
kvp_send_buffer = calloc(1, kvp_recv_buffer_len);
kvp_recv_buffer = calloc(1, kvp_recv_buffer_len);
if (!(kvp_send_buffer && kvp_recv_buffer)) {
syslog(LOG_ERR, "Failed to allocate netlink buffers");
exit(EXIT_FAILURE);
}
/*
* Retrieve OS release information.
*/
@ -1514,7 +1523,7 @@ int main(void)
continue;
}
len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
len = recvfrom(fd, kvp_recv_buffer, kvp_recv_buffer_len, 0,
addr_p, &addr_l);
if (len < 0) {

15
tools/hv/hv_vss_daemon.c
View File

@ -38,8 +38,6 @@
#include <linux/netlink.h>
#include <syslog.h>
static char vss_recv_buffer[4096];
static char vss_send_buffer[4096];
static struct sockaddr_nl addr;
#ifndef SOL_NETLINK
@ -147,6 +145,9 @@ int main(void)
struct cn_msg *incoming_cn_msg;
int op;
struct hv_vss_msg *vss_msg;
char *vss_send_buffer;
char *vss_recv_buffer;
size_t vss_recv_buffer_len;
if (daemon(1, 0))
return 1;
@ -154,6 +155,14 @@ int main(void)
openlog("Hyper-V VSS", 0, LOG_USER);
syslog(LOG_INFO, "VSS starting; pid is:%d", getpid());
vss_recv_buffer_len = NLMSG_HDRLEN + sizeof(struct cn_msg) + sizeof(struct hv_vss_msg);
vss_send_buffer = calloc(1, vss_recv_buffer_len);
vss_recv_buffer = calloc(1, vss_recv_buffer_len);
if (!(vss_send_buffer && vss_recv_buffer)) {
syslog(LOG_ERR, "Failed to allocate netlink buffers");
exit(EXIT_FAILURE);
}
fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_CONNECTOR);
if (fd < 0) {
syslog(LOG_ERR, "netlink socket creation failed; error:%d %s",
@ -215,7 +224,7 @@ int main(void)
continue;
}
len = recvfrom(fd, vss_recv_buffer, sizeof(vss_recv_buffer), 0,
len = recvfrom(fd, vss_recv_buffer, vss_recv_buffer_len, 0,
addr_p, &addr_l);
if (len < 0) {