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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time_namespace.h (3907B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_TIMENS_H
      3#define _LINUX_TIMENS_H
      4
      5
      6#include <linux/sched.h>
      7#include <linux/nsproxy.h>
      8#include <linux/ns_common.h>
      9#include <linux/err.h>
     10
     11struct user_namespace;
     12extern struct user_namespace init_user_ns;
     13
     14struct timens_offsets {
     15	struct timespec64 monotonic;
     16	struct timespec64 boottime;
     17};
     18
     19struct time_namespace {
     20	struct user_namespace	*user_ns;
     21	struct ucounts		*ucounts;
     22	struct ns_common	ns;
     23	struct timens_offsets	offsets;
     24	struct page		*vvar_page;
     25	/* If set prevents changing offsets after any task joined namespace. */
     26	bool			frozen_offsets;
     27} __randomize_layout;
     28
     29extern struct time_namespace init_time_ns;
     30
     31#ifdef CONFIG_TIME_NS
     32extern int vdso_join_timens(struct task_struct *task,
     33			    struct time_namespace *ns);
     34extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns);
     35
     36static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
     37{
     38	refcount_inc(&ns->ns.count);
     39	return ns;
     40}
     41
     42struct time_namespace *copy_time_ns(unsigned long flags,
     43				    struct user_namespace *user_ns,
     44				    struct time_namespace *old_ns);
     45void free_time_ns(struct time_namespace *ns);
     46void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);
     47struct vdso_data *arch_get_vdso_data(void *vvar_page);
     48
     49static inline void put_time_ns(struct time_namespace *ns)
     50{
     51	if (refcount_dec_and_test(&ns->ns.count))
     52		free_time_ns(ns);
     53}
     54
     55void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m);
     56
     57struct proc_timens_offset {
     58	int			clockid;
     59	struct timespec64	val;
     60};
     61
     62int proc_timens_set_offset(struct file *file, struct task_struct *p,
     63			   struct proc_timens_offset *offsets, int n);
     64
     65static inline void timens_add_monotonic(struct timespec64 *ts)
     66{
     67	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
     68
     69	*ts = timespec64_add(*ts, ns_offsets->monotonic);
     70}
     71
     72static inline void timens_add_boottime(struct timespec64 *ts)
     73{
     74	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
     75
     76	*ts = timespec64_add(*ts, ns_offsets->boottime);
     77}
     78
     79static inline u64 timens_add_boottime_ns(u64 nsec)
     80{
     81	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
     82
     83	return nsec + timespec64_to_ns(&ns_offsets->boottime);
     84}
     85
     86static inline void timens_sub_boottime(struct timespec64 *ts)
     87{
     88	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
     89
     90	*ts = timespec64_sub(*ts, ns_offsets->boottime);
     91}
     92
     93ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
     94				struct timens_offsets *offsets);
     95
     96static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
     97{
     98	struct time_namespace *ns = current->nsproxy->time_ns;
     99
    100	if (likely(ns == &init_time_ns))
    101		return tim;
    102
    103	return do_timens_ktime_to_host(clockid, tim, &ns->offsets);
    104}
    105
    106#else
    107static inline int vdso_join_timens(struct task_struct *task,
    108				   struct time_namespace *ns)
    109{
    110	return 0;
    111}
    112
    113static inline void timens_commit(struct task_struct *tsk,
    114				 struct time_namespace *ns)
    115{
    116}
    117
    118static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
    119{
    120	return NULL;
    121}
    122
    123static inline void put_time_ns(struct time_namespace *ns)
    124{
    125}
    126
    127static inline
    128struct time_namespace *copy_time_ns(unsigned long flags,
    129				    struct user_namespace *user_ns,
    130				    struct time_namespace *old_ns)
    131{
    132	if (flags & CLONE_NEWTIME)
    133		return ERR_PTR(-EINVAL);
    134
    135	return old_ns;
    136}
    137
    138static inline void timens_on_fork(struct nsproxy *nsproxy,
    139				 struct task_struct *tsk)
    140{
    141	return;
    142}
    143
    144static inline void timens_add_monotonic(struct timespec64 *ts) { }
    145static inline void timens_add_boottime(struct timespec64 *ts) { }
    146
    147static inline u64 timens_add_boottime_ns(u64 nsec)
    148{
    149	return nsec;
    150}
    151
    152static inline void timens_sub_boottime(struct timespec64 *ts) { }
    153
    154static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
    155{
    156	return tim;
    157}
    158#endif
    159
    160#endif /* _LINUX_TIMENS_H */