cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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projid.h (2269B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_PROJID_H
      3#define _LINUX_PROJID_H
      4
      5/*
      6 * A set of types for the internal kernel types representing project ids.
      7 *
      8 * The types defined in this header allow distinguishing which project ids in
      9 * the kernel are values used by userspace and which project id values are
     10 * the internal kernel values.  With the addition of user namespaces the values
     11 * can be different.  Using the type system makes it possible for the compiler
     12 * to detect when we overlook these differences.
     13 *
     14 */
     15#include <linux/types.h>
     16
     17struct user_namespace;
     18extern struct user_namespace init_user_ns;
     19
     20typedef __kernel_uid32_t projid_t;
     21
     22typedef struct {
     23	projid_t val;
     24} kprojid_t;
     25
     26static inline projid_t __kprojid_val(kprojid_t projid)
     27{
     28	return projid.val;
     29}
     30
     31#define KPROJIDT_INIT(value) (kprojid_t){ value }
     32
     33#define INVALID_PROJID KPROJIDT_INIT(-1)
     34#define OVERFLOW_PROJID 65534
     35
     36static inline bool projid_eq(kprojid_t left, kprojid_t right)
     37{
     38	return __kprojid_val(left) == __kprojid_val(right);
     39}
     40
     41static inline bool projid_lt(kprojid_t left, kprojid_t right)
     42{
     43	return __kprojid_val(left) < __kprojid_val(right);
     44}
     45
     46static inline bool projid_valid(kprojid_t projid)
     47{
     48	return !projid_eq(projid, INVALID_PROJID);
     49}
     50
     51#ifdef CONFIG_USER_NS
     52
     53extern kprojid_t make_kprojid(struct user_namespace *from, projid_t projid);
     54
     55extern projid_t from_kprojid(struct user_namespace *to, kprojid_t projid);
     56extern projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t projid);
     57
     58static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
     59{
     60	return from_kprojid(ns, projid) != (projid_t)-1;
     61}
     62
     63#else
     64
     65static inline kprojid_t make_kprojid(struct user_namespace *from, projid_t projid)
     66{
     67	return KPROJIDT_INIT(projid);
     68}
     69
     70static inline projid_t from_kprojid(struct user_namespace *to, kprojid_t kprojid)
     71{
     72	return __kprojid_val(kprojid);
     73}
     74
     75static inline projid_t from_kprojid_munged(struct user_namespace *to, kprojid_t kprojid)
     76{
     77	projid_t projid = from_kprojid(to, kprojid);
     78	if (projid == (projid_t)-1)
     79		projid = OVERFLOW_PROJID;
     80	return projid;
     81}
     82
     83static inline bool kprojid_has_mapping(struct user_namespace *ns, kprojid_t projid)
     84{
     85	return true;
     86}
     87
     88#endif /* CONFIG_USER_NS */
     89
     90#endif /* _LINUX_PROJID_H */