aeb3ae9da9
I am about to remove the struct user_namespace reference from struct user_struct. So keep an explicit track of the parent user namespace. Take advantage of this new reference and replace instances of user_ns->creator->user_ns with user_ns->parent. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
#ifndef _LINUX_USER_NAMESPACE_H
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#define _LINUX_USER_NAMESPACE_H
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#include <linux/kref.h>
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#include <linux/nsproxy.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 7)
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#define UIDHASH_SZ (1 << UIDHASH_BITS)
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struct user_namespace {
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struct kref kref;
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struct hlist_head uidhash_table[UIDHASH_SZ];
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struct user_namespace *parent;
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struct user_struct *creator;
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struct work_struct destroyer;
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};
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extern struct user_namespace init_user_ns;
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#ifdef CONFIG_USER_NS
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static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
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{
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if (ns)
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kref_get(&ns->kref);
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return ns;
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}
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extern int create_user_ns(struct cred *new);
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extern void free_user_ns(struct kref *kref);
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static inline void put_user_ns(struct user_namespace *ns)
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{
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if (ns)
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kref_put(&ns->kref, free_user_ns);
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}
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uid_t user_ns_map_uid(struct user_namespace *to, const struct cred *cred, uid_t uid);
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gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t gid);
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#else
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static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
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{
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return &init_user_ns;
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}
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static inline int create_user_ns(struct cred *new)
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{
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return -EINVAL;
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}
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static inline void put_user_ns(struct user_namespace *ns)
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{
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}
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static inline uid_t user_ns_map_uid(struct user_namespace *to,
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const struct cred *cred, uid_t uid)
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{
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return uid;
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}
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static inline gid_t user_ns_map_gid(struct user_namespace *to,
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const struct cred *cred, gid_t gid)
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{
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return gid;
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}
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#endif
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#endif /* _LINUX_USER_H */
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