91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PROJID_H
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#define _LINUX_PROJID_H
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/*
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* A set of types for the internal kernel types representing project ids.
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*
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* The types defined in this header allow distinguishing which project ids in
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* the kernel are values used by userspace and which project id values are
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* the internal kernel values. With the addition of user namespaces the values
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* can be different. Using the type system makes it possible for the compiler
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* to detect when we overlook these differences.
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*
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*/
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#include <linux/types.h>
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struct user_namespace;
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extern struct user_namespace init_user_ns;
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typedef __kernel_uid32_t projid_t;
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typedef struct {
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projid_t val;
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} kprojid_t;
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static inline projid_t __kprojid_val(kprojid_t projid)
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{
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return projid.val;
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}
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#define KPROJIDT_INIT(value) (kprojid_t){ value }
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#define INVALID_PROJID KPROJIDT_INIT(-1)
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#define OVERFLOW_PROJID 65534
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static inline bool projid_eq(kprojid_t left, kprojid_t right)
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{
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return __kprojid_val(left) == __kprojid_val(right);
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}
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static inline bool projid_lt(kprojid_t left, kprojid_t right)
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{
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return __kprojid_val(left) < __kprojid_val(right);
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}
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static inline bool projid_valid(kprojid_t projid)
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{
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return !projid_eq(projid, INVALID_PROJID);
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}
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#ifdef CONFIG_USER_NS
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extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid);
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extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid);
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extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid);
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static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
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{
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return from_kprojid(ns, projid) != (projid_t)-1;
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}
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#else
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static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid)
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{
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return KPROJIDT_INIT(projid);
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}
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static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid)
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{
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return __kprojid_val(kprojid);
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}
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static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid)
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{
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projid_t projid = from_kprojid(to, kprojid);
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if (projid == (projid_t)-1)
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projid = OVERFLOW_PROJID;
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return projid;
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}
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static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
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{
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return true;
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}
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#endif /* CONFIG_USER_NS */
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#endif /* _LINUX_PROJID_H */
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