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