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idmap_add_id: fix broken behavior

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The geteuid() addition is being made the first element of the lxc_list,
but the first element is just a head whose entry is ignored.  Therefore
userns_exec_1() was starting its tasks without the caller's uid mapped
into the namespace.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>
This commit is contained in:
Serge Hallyn 2014-01-23 22:23:24 -06:00 committed by Stéphane Graber
parent 9f2fd74c7b
commit 3ec1648d8e
1 changed files with 25 additions and 27 deletions
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28
src/lxc/conf.c
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@ -3969,29 +3969,31 @@ static struct lxc_list *idmap_add_id(struct lxc_conf *conf, uid_t uid)
struct lxc_list *new = NULL, *tmp, *it, *next; struct lxc_list *new = NULL, *tmp, *it, *next;
struct id_map *entry; struct id_map *entry;
if (hostid_mapped < 0) {
hostid_mapped = find_unmapped_nsuid(conf);
if (hostid_mapped < 0) {
ERROR("Could not find free uid to map");
return NULL;
}
new = malloc(sizeof(*new)); new = malloc(sizeof(*new));
if (!new) { if (!new) {
ERROR("Out of memory building id map"); ERROR("Out of memory building id map");
return NULL; return NULL;
} }
lxc_list_init(new);
if (hostid_mapped < 0) {
hostid_mapped = find_unmapped_nsuid(conf);
if (hostid_mapped < 0)
goto err;
tmp = malloc(sizeof(*tmp));
if (!tmp)
goto err;
entry = malloc(sizeof(*entry)); entry = malloc(sizeof(*entry));
if (!entry) { if (!entry) {
free(new); free(tmp);
ERROR("Out of memory building idmap entry"); goto err;
return NULL;
} }
new->elem = entry; tmp->elem = entry;
entry->idtype = ID_TYPE_UID; entry->idtype = ID_TYPE_UID;
entry->nsid = hostid_mapped; entry->nsid = hostid_mapped;
entry->hostid = (unsigned long)uid; entry->hostid = (unsigned long)uid;
entry->range = 1; entry->range = 1;
lxc_list_init(new); lxc_list_add_tail(new, tmp);
} }
lxc_list_for_each_safe(it, &conf->id_map, next) { lxc_list_for_each_safe(it, &conf->id_map, next) {
tmp = malloc(sizeof(*tmp)); tmp = malloc(sizeof(*tmp));
@ -4005,10 +4007,6 @@ static struct lxc_list *idmap_add_id(struct lxc_conf *conf, uid_t uid)
memset(entry, 0, sizeof(*entry)); memset(entry, 0, sizeof(*entry));
memcpy(entry, it->elem, sizeof(*entry)); memcpy(entry, it->elem, sizeof(*entry));
tmp->elem = entry; tmp->elem = entry;
if (!new) {
new = tmp;
lxc_list_init(new);
} else
lxc_list_add_tail(new, tmp); lxc_list_add_tail(new, tmp);
} }