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authorAndrey Vagin <avagin@openvz.org>2016-09-06 00:47:13 -0700
committerMichael Bestas <mkbestas@lineageos.org>2022-04-19 00:51:06 +0300
commit6c69e3aa5f24178424da5e13dd704b15bb5d820d (patch)
tree840a5ee46ddd92b5da6eb9f71949b70b0b5768d0 /include/linux/user_namespace.h
parent25ef12806840e0222a4f292021f39dfc8a054166 (diff)
kernel: add a helper to get an owning user namespace for a namespace
Return -EPERM if an owning user namespace is outside of a process current user namespace. v2: In a first version ns_get_owner returned ENOENT for init_user_ns. This special cases was removed from this version. There is nothing outside of init_user_ns, so we can return EPERM. v3: rename ns->get_owner() to ns->owner(). get_* usually means that it grabs a reference. Acked-by: Serge Hallyn <serge@hallyn.com> Signed-off-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Chatur27 <jasonbright2709@gmail.com>
Diffstat (limited to 'include/linux/user_namespace.h')
-rw-r--r--include/linux/user_namespace.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 9217169c64cb..190cf0760815 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -73,6 +73,8 @@ extern ssize_t proc_setgroups_write(struct file *, const char __user *, size_t,
extern int proc_setgroups_show(struct seq_file *m, void *v);
extern bool userns_may_setgroups(const struct user_namespace *ns);
extern bool current_in_userns(const struct user_namespace *target_ns);
+
+struct ns_common *ns_get_owner(struct ns_common *ns);
#else
static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
@@ -106,6 +108,11 @@ static inline bool current_in_userns(const struct user_namespace *target_ns)
{
return true;
}
+
+static inline struct ns_common *ns_get_owner(struct ns_common *ns)
+{
+ return ERR_PTR(-EPERM);
+}
#endif
#endif /* _LINUX_USER_H */