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On Thu, 24 May 2018 23:37:45 +0300 Julian Anastasov <ja@xxxxxx> wrote:
> Size or length? Here is the answer:
>
> - IP_VS_SCHEDNAME_MAXLEN and IP_VS_IFNAME_MAXLEN are sizes
> because they are used in kernel structures exported to user
> space for the old setsockopt interface. We can not change
> these structures in the kernel.
>
> - IP_VS_PENAME_MAXLEN and IP_VS_PEDATA_MAXLEN are max lengths
> because they are not exported to the old interface.
>
> As result:
> - buffers should have space for NUL terminator
> - strncpy should use sizeof(buffer) - 1 as max length
>
> As we change the libipvs structures, their users should be
> recompiled.
>
> Signed-off-by: Julian Anastasov <ja@xxxxxx>
This all looks fine to me. I'll give other people a little time to
review and ACK, before I apply this.
(To Julian) did you find this by manual review, or did you use some tool
to find these?
> ---
> ipvsadm.c | 8 ++++----
> libipvs/ip_vs.h | 4 ++--
> libipvs/libipvs.c | 7 ++++---
> 3 files changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/ipvsadm.c b/ipvsadm.c
> index 1a28d72..7695006 100644
> --- a/ipvsadm.c
> +++ b/ipvsadm.c
> @@ -595,7 +595,7 @@ parse_options(int argc, char **argv, struct
> ipvs_command_entry *ce,
> case 's':
> set_option(options, OPT_SCHEDULER);
> strncpy(ce->svc.sched_name,
> - optarg, IP_VS_SCHEDNAME_MAXLEN);
> + optarg, IP_VS_SCHEDNAME_MAXLEN - 1);
> break;
> case 'p':
> set_option(options, OPT_PERSISTENT);
> @@ -670,7 +670,7 @@ parse_options(int argc, char **argv, struct
> ipvs_command_entry *ce,
> case TAG_MCAST_INTERFACE:
> set_option(options, OPT_MCAST);
> strncpy(ce->daemon.mcast_ifn,
> - optarg, IP_VS_IFNAME_MAXLEN);
> + optarg, IP_VS_IFNAME_MAXLEN - 1);
> break;
> case 'I':
> set_option(options, OPT_SYNCID);
> @@ -1415,8 +1415,8 @@ static void print_conn(char *buf, unsigned int format)
> unsigned int expires;
> unsigned short af = AF_INET;
> unsigned short daf = AF_INET;
> - char pe_name[IP_VS_PENAME_MAXLEN];
> - char pe_data[IP_VS_PEDATA_MAXLEN];
> + char pe_name[IP_VS_PENAME_MAXLEN + 1];
> + char pe_data[IP_VS_PEDATA_MAXLEN + 1];
>
> int n;
> char temp1[INET6_ADDRSTRLEN], temp2[INET6_ADDRSTRLEN],
> temp3[INET6_ADDRSTRLEN];
> diff --git a/libipvs/ip_vs.h b/libipvs/ip_vs.h
> index 774ff96..e57d55a 100644
> --- a/libipvs/ip_vs.h
> +++ b/libipvs/ip_vs.h
> @@ -144,7 +144,7 @@ struct ip_vs_service_user {
> __be32 netmask; /* persistent netmask */
> u_int16_t af;
> union nf_inet_addr addr;
> - char pe_name[IP_VS_PENAME_MAXLEN];
> + char pe_name[IP_VS_PENAME_MAXLEN + 1];
> };
>
> struct ip_vs_dest_kern {
> @@ -267,7 +267,7 @@ struct ip_vs_service_entry {
>
> u_int16_t af;
> union nf_inet_addr addr;
> - char pe_name[IP_VS_PENAME_MAXLEN];
> + char pe_name[IP_VS_PENAME_MAXLEN + 1];
>
> /* statistics, 64-bit */
> struct ip_vs_stats64 stats64;
> diff --git a/libipvs/libipvs.c b/libipvs/libipvs.c
> index a843243..9be7700 100644
> --- a/libipvs/libipvs.c
> +++ b/libipvs/libipvs.c
> @@ -719,7 +719,7 @@ static int ipvs_services_parse_cb(struct nl_msg *msg,
> void *arg)
>
> strncpy(get->entrytable[i].sched_name,
> nla_get_string(svc_attrs[IPVS_SVC_ATTR_SCHED_NAME]),
> - IP_VS_SCHEDNAME_MAXLEN);
> + IP_VS_SCHEDNAME_MAXLEN - 1);
>
> if (svc_attrs[IPVS_SVC_ATTR_PE_NAME])
> strncpy(get->entrytable[i].pe_name,
> @@ -1199,7 +1199,7 @@ static int ipvs_daemon_parse_cb(struct nl_msg *msg,
> void *arg)
> u[i].state = nla_get_u32(daemon_attrs[IPVS_DAEMON_ATTR_STATE]);
> strncpy(u[i].mcast_ifn,
> nla_get_string(daemon_attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
> - IP_VS_IFNAME_MAXLEN);
> + IP_VS_IFNAME_MAXLEN - 1);
> u[i].syncid = nla_get_u32(daemon_attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
>
> a = daemon_attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
> @@ -1265,7 +1265,8 @@ ipvs_daemon_t *ipvs_get_daemon(void)
> }
> for (i = 0; i < 2; i++) {
> u[i].state = dmk[i].state;
> - strncpy(u[i].mcast_ifn, dmk[i].mcast_ifn, IP_VS_IFNAME_MAXLEN);
> + strncpy(u[i].mcast_ifn, dmk[i].mcast_ifn,
> + IP_VS_IFNAME_MAXLEN - 1);
> u[i].syncid = dmk[i].syncid;
> }
> return u;
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
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