218 lines
5.6 KiB
C
218 lines
5.6 KiB
C
/*
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* This is needed backporting of source code from Kernel version 4.x
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*
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* Copyright (C) 2018 Samsung Electronics, Inc.
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*
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* Hryhorii Tur, <hryhorii.tur@partner.samsung.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __LINUX_PROCA_PORTING_H
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#define __LINUX_PROCA_PORTING_H
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#include <linux/version.h>
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#include <linux/memory.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/rcupdate.h>
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#include <linux/atomic.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)
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static inline struct inode *locks_inode(const struct file *f)
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{
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return f->f_path.dentry->d_inode;
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}
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static inline ssize_t
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__vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name,
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void *value, size_t size)
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{
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if (inode->i_op->getxattr)
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return inode->i_op->getxattr(dentry, name, value, size);
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else
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return -EOPNOTSUPP;
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}
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#endif
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#if LINUX_VERSION_CODE > KERNEL_VERSION(4, 10, 17)
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/* Some linux headers are moved.
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* Since Kernel 4.11 get_task_struct moved to sched/ folder.
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*/
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#include <linux/sched/task.h>
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#else
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#include <linux/sched.h>
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 21)
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/* d_backing_inode is absent on some Linux Kernel 3.x. but it back porting for
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* few Samsung kernels:
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* Exynos7570 (3.18.14): CL 13680422
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* Exynos7870 (3.18.14): CL 14632149
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* SDM450 (3.18.71): initially
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*/
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#if !defined(CONFIG_SOC_EXYNOS7570) && !defined(CONFIG_ARCH_SDM450) && \
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!defined(CONFIG_SOC_EXYNOS7870)
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#define d_backing_inode(dentry) ((dentry)->d_inode)
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#endif
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#define inode_lock(inode) mutex_lock(&(inode)->i_mutex)
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#define inode_unlock(inode) mutex_unlock(&(inode)->i_mutex)
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
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#define security_add_hooks(hooks, count, name)
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#else
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#define LINUX_LSM_SUPPORTED
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#include <linux/lsm_hooks.h>
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
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#define security_add_hooks(hooks, count, name) security_add_hooks(hooks, count)
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#endif
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#endif
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/*
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* VA_BITS is present only on 64 bit kernels
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*/
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#if defined(CONFIG_ARM)
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#define VA_BITS 30
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#endif
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/*
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* VA_START macro is backported to SDM450 kernel (3.18.120)
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*/
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0) && \
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!(defined(CONFIG_ARCH_SDM450) && defined(CONFIG_ARM64))
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#define VA_START (UL(0xffffffffffffffff) - \
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(UL(1) << VA_BITS) + 1)
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#endif
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/*
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* VA_START macro is not used since Android Kernel v5.4
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*/
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0)
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#define VA_START (PAGE_OFFSET)
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#endif
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/*
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* KASLR is backported to 4.4 kernels
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*/
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#ifndef PROCA_KUNIT_ENABLED
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
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static inline uintptr_t get_kimage_vaddr(void)
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{
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return PAGE_OFFSET;
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}
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static inline uintptr_t get_kimage_voffset(void)
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{
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return get_kimage_vaddr() - virt_to_phys((void *)get_kimage_vaddr());
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}
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#else
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static inline u64 get_kimage_vaddr(void)
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{
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return kimage_vaddr;
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}
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static inline u64 get_kimage_voffset(void)
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{
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return kimage_voffset;
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}
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#endif
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#endif
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#ifndef OVERLAYFS_SUPER_MAGIC
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#define OVERLAYFS_SUPER_MAGIC 0x794c7630
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 8)
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static inline struct dentry *d_real_comp(struct dentry *dentry)
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{
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return dentry;
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}
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#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
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static inline struct dentry *d_real_comp(struct dentry *dentry)
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{
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return d_real(dentry);
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}
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#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0)
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static inline struct dentry *d_real_comp(struct dentry *dentry)
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{
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return d_real(dentry, NULL, 0);
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}
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#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 19, 0)
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static inline struct dentry *d_real_comp(struct dentry *dentry)
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{
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return d_real(dentry, NULL, 0, 0);
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}
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#else
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static inline struct dentry *d_real_comp(struct dentry *dentry)
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{
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return d_real(dentry, d_real_inode(dentry));
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}
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#endif
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 22)
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#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count)
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static inline struct file *_get_mm_exe_file(struct mm_struct *mm)
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{
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struct file *exe_file;
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rcu_read_lock();
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exe_file = rcu_dereference(mm->exe_file);
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if (exe_file && !get_file_rcu(exe_file))
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exe_file = NULL;
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rcu_read_unlock();
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return exe_file;
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}
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static inline struct file *get_task_exe_file(struct task_struct *task)
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{
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struct file *exe_file = NULL;
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struct mm_struct *mm;
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task_lock(task);
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mm = task->mm;
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if (mm) {
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if (!(task->flags & PF_KTHREAD))
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exe_file = _get_mm_exe_file(mm);
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}
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task_unlock(task);
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return exe_file;
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}
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#endif
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#if (defined(CONFIG_ANDROID) && (LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0) || \
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LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0))) || \
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LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 0)
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/*
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* __vfs_getxattr was changed in Android Kernel v5.4
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* https://android.googlesource.com/kernel/common/+/3484eba91d6b529cc606486a2db79513f3db6c67
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* and was reverted in Android Kernel v5.15
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* https://android.googlesource.com/kernel/common/+/e884438aa554219a6d0df3a18ff0b23ea678c36c
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*/
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#define XATTR_NOSECURITY 0x4 /* get value, do not involve security check */
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#define __vfs_getxattr(dentry, inode, name, value, size, flags) \
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__vfs_getxattr(dentry, inode, name, value, size)
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 12, 0)
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#define __vfs_setxattr_noperm(dentry, name, value, size, flags) \
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__vfs_setxattr_noperm(&init_user_ns, dentry, name, value, size, flags)
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#endif
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#endif /* __LINUX_PROCA_PORTING_H */
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