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ns: Implement set_user_ns()

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Add a field pstree_item::user_ns, which shows the task's current
user_ns, and introduce helpers to set it.

v3: Rebase on fdstore

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kirill Tkhai
2017-02-23 18:16:17 +03:00
committed by Andrei Vagin
parent f9582b0bd3
commit 87ad5ec22c
3 changed files with 48 additions and 0 deletions
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2
criu/include/namespaces.h
View File

@@ -164,6 +164,8 @@ extern struct ns_id *lookup_ns_by_id(unsigned int id, struct ns_desc *nd);
extern int collect_user_namespaces(bool for_dump);
extern int prepare_userns(pid_t real_pid, UsernsEntry *e);
extern int __set_user_ns(struct ns_id *ns);
extern int set_user_ns(u32 id);
extern int stop_usernsd(void);
extern uid_t userns_uid(uid_t uid);

1
criu/include/pstree.h
View File

@@ -29,6 +29,7 @@ struct pstree_item {
futex_t task_st;
unsigned long task_st_le_bits;
};
struct ns_id *user_ns;
};
static inline pid_t vpid(const struct pstree_item *i)

45
criu/namespaces.c
View File

@@ -2277,5 +2277,50 @@ err_unds:
return -1;
}
int __set_user_ns(struct ns_id *ns)
{
int fd;
if (!(root_ns_mask & CLONE_NEWUSER))
return 0;
if (current->user_ns && current->user_ns->id == ns->id)
return 0;
fd = fdstore_get(ns->user.nsfd_id);
if (fd < 0) {
pr_err("Can't get ns fd\n");
return -1;
}
if (setns(fd, CLONE_NEWUSER) < 0) {
pr_perror("Can't setns");
close(fd);
return -1;
}
current->user_ns = ns;
close(fd);
if (prepare_userns_creds() < 0) {
pr_err("Can't set creds\n");
return -1;
}
return 0;
}
int set_user_ns(u32 id)
{
struct ns_id *ns;
if (current->user_ns && current->user_ns->id == id)
return 0;
ns = lookup_ns_by_id(id, &user_ns_desc);
if (!ns) {
pr_err("Can't find user_ns %u\n", id);
return -1;
}
return __set_user_ns(ns);
}
struct ns_desc pid_ns_desc = NS_DESC_ENTRY(CLONE_NEWPID, "pid");
struct ns_desc user_ns_desc = NS_DESC_ENTRY(CLONE_NEWUSER, "user");