From b4919a5f95c09992f66d4b7cbe392c33731a5cec Mon Sep 17 00:00:00 2001 From: Olaf Hering Date: Thu, 1 Aug 2013 14:34:26 +0200 Subject: [PATCH] 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 Signed-off-by: K. Y. Srinivasan Signed-off-by: Greg Kroah-Hartman --- tools/hv/hv_kvp_daemon.c | 15 ++++++++++++--- tools/hv/hv_vss_daemon.c | 15 ++++++++++++--- 2 files changed, 24 insertions(+), 6 deletions(-) diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c index 07819bfa7dba..657c1d27e02e 100644 --- a/tools/hv/hv_kvp_daemon.c +++ b/tools/hv/hv_kvp_daemon.c @@ -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) { diff --git a/tools/hv/hv_vss_daemon.c b/tools/hv/hv_vss_daemon.c index 826d499dc354..4213d0e3083f 100644 --- a/tools/hv/hv_vss_daemon.c +++ b/tools/hv/hv_vss_daemon.c @@ -38,8 +38,6 @@ #include #include -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) {