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/**
@file
@brief Support for legacy Linux kernel versions
@details Copyright (c) 2018-2021 Acronis International GmbH
@author Mikhail Krivtsov (mikhail.krivtsov@acronis.com)
@since $Id: $
*/
#pragma once
#include <linux/cred.h> // current_fsuid_fsgid
#include <linux/fs.h> // vfs_stat
#include <linux/stat.h> // struct kstat
#include <linux/version.h>
// CentOS/RedHat kernel has many backports
// 'LINUX_VERSION_CODE' cannot be trusted on RHEL distros so only 'grep' is used for CentOS and CloudLinux
// For 'normal kernels', 'LINUX_VERSION_CODE' should be used
#ifndef RHEL_RELEASE_VERSION
// 'linux/sched/task.h' appeared in 'stable/v4.11'
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0)
# ifdef HAVE_SCHED_TASK_H
# undef HAVE_SCHED_TASK_H
# endif
# ifndef HAVE_SCHED_H
# define HAVE_SCHED_H
# endif
#else
# ifndef HAVE_SCHED_TASK_H
# define HAVE_SCHED_TASK_H
# endif
# ifdef HAVE_SCHED_H
# undef HAVE_SCHED_H
# endif
#endif
// 'get_fs_pwd()' appeared in 'stable/v2.6.36'
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
# ifdef HAVE_GET_FS_ROOT
# undef HAVE_GET_FS_ROOT
# endif
# ifdef HAVE_GET_FS_PWD
# undef HAVE_GET_FS_PWD
# endif
# undef HAVE_GET_FS_PWD
#else
# ifndef HAVE_GET_FS_ROOT
# define HAVE_GET_FS_ROOT
# endif
# ifndef HAVE_GET_FS_PWD
# define HAVE_GET_FS_PWD
# endif
#endif
// Second arg of 'vfs_fstatat()' was made 'const' in 'stable/v2.6.36'
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
# ifdef HAVE_VFS_FSTATAT_CONST
# undef HAVE_VFS_FSTATAT_CONST
# endif
#else
# ifndef HAVE_VFS_FSTATAT_CONST
# define HAVE_VFS_FSTATAT_CONST
# endif
#endif
// 'get_task_exe_file()' appeared in 'stable/v4.8'
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
# ifdef HAVE_GET_TASK_EXE
# undef HAVE_GET_TASK_EXE
# endif
#else
# ifndef HAVE_GET_TASK_EXE
# define HAVE_GET_TASK_EXE
# endif
#endif
// 'data' arg was added to 'probe' callback in v.2.6.35
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
# ifdef HAVE_TRACEPOINT_PROBE_REGISTER_DATA
# undef HAVE_TRACEPOINT_PROBE_REGISTER_DATA
# endif
#else
# ifndef HAVE_TRACEPOINT_PROBE_REGISTER_DATA
# define HAVE_TRACEPOINT_PROBE_REGISTER_DATA
# endif
// registration interface was modified in 'stable/v3.15'
# if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
# ifdef HAVE_TRACEPOINT_PROBE_REGISTER_STRUCT
# undef HAVE_TRACEPOINT_PROBE_REGISTER_STRUCT
# endif
# else
# ifndef HAVE_TRACEPOINT_PROBE_REGISTER_STRUCT
# define HAVE_TRACEPOINT_PROBE_REGISTER_STRUCT
# endif
# endif
#endif
// rbtree postorder iteration functions appeared in 'stable/v3.12'
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0)
# ifdef HAVE_RB_FIRST_POSTORDER
# undef HAVE_RB_FIRST_POSTORDER
# endif
# ifdef HAVE_RB_NEXT_POSTORDER
# undef HAVE_RB_NEXT_POSTORDER
# endif
#else
# ifndef HAVE_RB_FIRST_POSTORDER
# define HAVE_RB_FIRST_POSTORDER
# endif
# ifndef HAVE_RB_NEXT_POSTORDER
# define HAVE_RB_NEXT_POSTORDER
# endif
#endif
// kuid/kgid is used instead uid/gid since 'stable/v3.5.0'
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 5, 0)
# ifdef HAVE_STRUCT_CRED_KUID
# undef HAVE_STRUCT_CRED_KUID
# endif
#else
# ifndef HAVE_STRUCT_CRED_KUID
# define HAVE_STRUCT_CRED_KUID
# endif
#endif
#endif
#ifdef HAVE_SCHED_H
#include <linux/sched.h> // put_task_struct()
#endif
#ifdef HAVE_SCHED_TASK_H
#include <linux/sched/task.h> // put_task_struct()
#endif
#ifndef HAVE_GET_FS_ROOT
#include <linux/fs_struct.h>
#include <linux/path.h>
static inline void get_fs_root(struct fs_struct *fs, struct path *root)
{
read_lock(&fs->lock);
*root = fs->root;
path_get(root);
read_unlock(&fs->lock);
}
#endif
#ifndef HAVE_GET_FS_PWD
#include <linux/fs_struct.h>
#include <linux/path.h>
static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
{
read_lock(&fs->lock);
*pwd = fs->pwd;
path_get(pwd);
read_unlock(&fs->lock);
}
#endif
static inline int vfs_fstatat_compat(int dfd, const char __user *filename,
struct kstat *stat, int flag)
{
#ifndef HAVE_VFS_FSTATAT_CONST
return vfs_fstatat(dfd, (char *)filename, stat, flag);
#else
return vfs_fstatat(dfd, filename, stat, flag);
#endif
}
static inline struct inode *file_inode_compat(const struct file *f)
{
return f->f_path.dentry->d_inode;
}
#ifndef HAVE_GET_TASK_EXE
struct file *get_task_exe_file(struct task_struct *task);
#endif
#ifndef HAVE_PATH_EQUAL
static inline int path_equal(const struct path *path1, const struct path *path2)
{
return path1->mnt == path2->mnt && path1->dentry == path2->dentry;
}
#endif
#define TRACE_CB_NAME(name) trace_##name##_cb
#ifndef HAVE_TRACEPOINT_PROBE_REGISTER_DATA
#define REGISTER_TRACE(name, probe) register_trace_##name(probe)
#define UNREGISTER_TRACE(name, probe) unregister_trace_##name(probe)
#define TRACE_CB_PROTO(name, proto) void TRACE_CB_NAME(name)(PARAMS(proto))
#else
#ifndef HAVE_TRACEPOINT_PROBE_REGISTER_STRUCT
#define REGISTER_TRACE(name, probe) register_trace_##name(probe, NULL)
#define UNREGISTER_TRACE(name, probe) unregister_trace_##name(probe, NULL)
#else
int tracepoint_probe_register_compat(const char *name, void *probe, void *data);
#define REGISTER_TRACE(name, probe) \
tracepoint_probe_register_compat(#name, probe, NULL)
int tracepoint_probe_unregister_compat(const char *name, void *probe, void *data);
#define UNREGISTER_TRACE(name, probe) \
tracepoint_probe_unregister_compat(#name, probe, NULL)
#endif
#define TRACE_CB_PROTO(name, proto) \
void TRACE_CB_NAME(name)(void *cb_data, PARAMS(proto))
#endif
#ifndef HAVE_RB_FIRST_POSTORDER
#include <linux/rbtree.h>
extern struct rb_node *rb_first_postorder(const struct rb_root *);
#endif
#ifndef HAVE_RB_NEXT_POSTORDER
#include <linux/rbtree.h>
extern struct rb_node *rb_next_postorder(const struct rb_node *);
#endif
static inline void get_current_fsuid_fsgid_compat(uid_t* fsuid, gid_t* fsgid)
{
#ifndef HAVE_STRUCT_CRED_KUID
current_fsuid_fsgid(fsuid, fsgid);
#else
kuid_t fskuid;
kgid_t fskgid;
current_fsuid_fsgid(&fskuid, &fskgid);
*fsuid = fskuid.val;
*fsgid = fskgid.val;
#endif
}
/*
2.6.32-71.el6
unsigned int module_refcount(struct module *mod)
linux-3.10.0-123.el7
unsigned long module_refcount(struct module *mod)
*/
#define module_refcount_compat(m) ((unsigned long)module_refcount(m))
unsigned long compat_kallsyms_lookup_name(const char *name);