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ns: Add ns_get_userns() feature

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Check for NS_GET_USERNS nsfs ioctl().

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kirill Tkhai
2017-05-17 15:19:27 +03:00
committed by Andrei Vagin
parent c739646659
commit 10ed43f2d5
3 changed files with 37 additions and 4 deletions
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13
criu/cr-check.c
View File

@@ -1084,6 +1084,17 @@ static int check_ns_pid(void)
return 0;
}
static int check_ns_get_userns(void)
{
if (kerndat_has_ns_get_userns() < 0)
return -1;
if (!kdat.has_ns_get_userns)
return -1;
return 0;
}
static int (*chk_feature)(void);
/*
@@ -1192,6 +1203,7 @@ int cr_check(void)
ret |= check_uffd_noncoop();
ret |= check_sk_netns();
ret |= check_ns_pid();
ret |= check_ns_get_userns();
}
/*
@@ -1274,6 +1286,7 @@ static struct feature_list feature_list[] = {
{ "nsid", check_nsid },
{ "link_nsid", check_link_nsid},
{ "ns_pid", check_ns_pid},
{ "ns_get_userns", check_ns_get_userns },
{ NULL, NULL },
};

2
criu/include/kerndat.h
View File

@@ -67,6 +67,7 @@ struct kerndat_s {
bool has_nsid;
bool has_link_nsid;
bool has_nspid;
bool has_ns_get_userns;
};
extern struct kerndat_s kdat;
@@ -90,5 +91,6 @@ extern int kerndat_fs_virtualized(unsigned int which, u32 kdev);
extern int kerndat_tcp_repair();
extern int kerndat_uffd(void);
extern int kerndat_has_nspid(void);
extern int kerndat_has_ns_get_userns(void);
#endif /* __CR_KERNDAT_H__ */

26
criu/kerndat.c
View File

@@ -669,6 +669,26 @@ err:
return ret;
}
int kerndat_has_ns_get_userns(void)
{
int pid_fd, user_fd;
pid_fd = open("/proc/self/ns/pid", O_RDONLY);
if (pid_fd < 0) {
perror("Can't open pid ns");
return -1;
}
user_fd = ioctl(pid_fd, NS_GET_USERNS);
if (user_fd >= 0) {
kdat.has_ns_get_userns = true;
close(user_fd);
}
close(pid_fd);
return 0;
}
#define KERNDAT_CACHE_FILE KDAT_RUNDIR"/criu.kdat"
#define KERNDAT_CACHE_FILE_TMP KDAT_RUNDIR"/.criu.kdat"
@@ -926,12 +946,10 @@ int kerndat_init(void)
/* Depends on kerndat_vdso_fill_symtable() */
if (!ret)
ret = kerndat_vdso_preserves_hint();
if (!ret)
ret = kerndat_socket_netns();
if (!ret)
ret = kerndat_nsid();
if (!ret)
ret = kerndat_has_nspid();
if (!ret)
ret = kerndat_has_ns_get_userns();
kerndat_lsm();
kerndat_mmap_min_addr();