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userns: Handle -1 in k[ug]id_has_mapping when !CONFIG_USER_NS

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Refuse to admit any user namespace has a mapping of the INVALID_UID
and the INVALID_GID when !CONFIG_USER_NS.

Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2016-06-27 15:52:48 -05:00
parent a475acf01f
commit 37b11804ed
1 changed files with 2 additions and 2 deletions
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4
include/linux/uidgid.h
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@ -177,12 +177,12 @@ static inline gid_t from_kgid_munged(struct user_namespace *to, kgid_t kgid)
static inline bool kuid_has_mapping(struct user_namespace *ns, kuid_t uid)
{
return true;
return uid_valid(uid);
}
static inline bool kgid_has_mapping(struct user_namespace *ns, kgid_t gid)
{
return true;
return gid_valid(gid);
}
#endif /* CONFIG_USER_NS */