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netdev-dpdk: Restrict vhost_sock_dir

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Since the vhost-user sockets directory now comes from the database, it is
possible for any user with database access to program an arbitrary filesystem
location for the sockets directory. This could result in unprivileged users
creating or deleting arbitrary filesystem files by using specially crafted
names. To prevent this, 'vhost-sock-dir' is now relative to ovs_rundir()
and must not contain "..".

Signed-off-by: Aaron Conole <aconole@redhat.com>
Acked-by: Daniele Di Proietto <diproiettod@vmware.com>
This commit is contained in:
Aaron Conole
2016-04-29 13:44:02 -04:00
committed by Daniele Di Proietto
parent bab6940971
commit d8a8f353c2
2 changed files with 26 additions and 7 deletions
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29
lib/netdev-dpdk.c
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@@ -2895,6 +2895,9 @@ dpdk_init__(const struct smap *ovs_other_config)
int argc;
int err;
cpu_set_t cpuset;
#ifndef VHOST_CUSE
char *sock_dir_subcomponent;
#endif
if (!smap_get_bool(ovs_other_config, "dpdk-init", false)) {
VLOG_INFO("DPDK Disabled - to change this requires a restart.\n");
@@ -2907,15 +2910,29 @@ dpdk_init__(const struct smap *ovs_other_config)
if (process_vhost_flags("cuse-dev-name", xstrdup("vhost-net"),
PATH_MAX, ovs_other_config, &cuse_dev_name)) {
#else
if (process_vhost_flags("vhost-sock-dir", xstrdup(ovs_rundir()),
NAME_MAX, ovs_other_config, &vhost_sock_dir)) {
if (process_vhost_flags("vhost-sock-dir", xstrdup(""),
NAME_MAX, ovs_other_config,
&sock_dir_subcomponent)) {
struct stat s;
if (!strstr(sock_dir_subcomponent, "..")) {
vhost_sock_dir = xasprintf("%s/%s", ovs_rundir(),
sock_dir_subcomponent);
err = stat(vhost_sock_dir, &s);
if (err) {
VLOG_ERR("vhost-user sock directory '%s' does not exist.",
vhost_sock_dir);
err = stat(vhost_sock_dir, &s);
if (err) {
VLOG_ERR("vhost-user sock directory '%s' does not exist.",
vhost_sock_dir);
}
} else {
vhost_sock_dir = xstrdup(ovs_rundir());
VLOG_ERR("vhost-user sock directory request '%s/%s' has invalid"
"characters '..' - using %s instead.",
ovs_rundir(), sock_dir_subcomponent, ovs_rundir());
}
free(sock_dir_subcomponent);
} else {
vhost_sock_dir = xstrdup(ovs_rundir());
free(sock_dir_subcomponent);
#endif
}