diff options
Diffstat (limited to 'kernel/user_namespace.c')
| -rw-r--r-- | kernel/user_namespace.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index b2d70d38dff4..25915832291a 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -9,6 +9,7 @@ #include <linux/nsproxy.h> #include <linux/slab.h> #include <linux/user_namespace.h> +#include <linux/highuid.h> #include <linux/cred.h> /* @@ -82,3 +83,46 @@ void free_user_ns(struct kref *kref) schedule_work(&ns->destroyer); } EXPORT_SYMBOL(free_user_ns); + +uid_t user_ns_map_uid(struct user_namespace *to, const struct cred *cred, uid_t uid) +{ + struct user_namespace *tmp; + + if (likely(to == cred->user->user_ns)) + return uid; + + + /* Is cred->user the creator of the target user_ns + * or the creator of one of it's parents? + */ + for ( tmp = to; tmp != &init_user_ns; + tmp = tmp->creator->user_ns ) { + if (cred->user == tmp->creator) { + return (uid_t)0; + } + } + + /* No useful relationship so no mapping */ + return overflowuid; +} + +gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t gid) +{ + struct user_namespace *tmp; + + if (likely(to == cred->user->user_ns)) + return gid; + + /* Is cred->user the creator of the target user_ns + * or the creator of one of it's parents? + */ + for ( tmp = to; tmp != &init_user_ns; + tmp = tmp->creator->user_ns ) { + if (cred->user == tmp->creator) { + return (gid_t)0; + } + } + + /* No useful relationship so no mapping */ + return overflowgid; +} |