![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
219 lines
5.3 KiB
C
219 lines
5.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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* Copyright (C) 2006, 2007 University of Szeged, Hungary
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*
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* Authors: Zoltan Sogor
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* Artem Bityutskiy (Битюцкий Артём)
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* Adrian Hunter
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*/
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/* This file implements EXT2-compatible extended attribute ioctl() calls */
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include "ubifs.h"
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/* Need to be kept consistent with checked flags in ioctl2ubifs() */
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#define UBIFS_SUPPORTED_IOCTL_FLAGS \
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(FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
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FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
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/**
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* ubifs_set_inode_flags - set VFS inode flags.
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* @inode: VFS inode to set flags for
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*
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* This function propagates flags from UBIFS inode object to VFS inode object.
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*/
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void ubifs_set_inode_flags(struct inode *inode)
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{
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unsigned int flags = ubifs_inode(inode)->flags;
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inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC |
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S_ENCRYPTED);
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if (flags & UBIFS_SYNC_FL)
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inode->i_flags |= S_SYNC;
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if (flags & UBIFS_APPEND_FL)
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inode->i_flags |= S_APPEND;
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if (flags & UBIFS_IMMUTABLE_FL)
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inode->i_flags |= S_IMMUTABLE;
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if (flags & UBIFS_DIRSYNC_FL)
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inode->i_flags |= S_DIRSYNC;
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if (flags & UBIFS_CRYPT_FL)
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inode->i_flags |= S_ENCRYPTED;
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}
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/*
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* ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags.
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* @ioctl_flags: flags to convert
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*
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* This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags
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* (@UBIFS_COMPR_FL, etc).
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*/
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static int ioctl2ubifs(int ioctl_flags)
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{
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int ubifs_flags = 0;
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if (ioctl_flags & FS_COMPR_FL)
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ubifs_flags |= UBIFS_COMPR_FL;
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if (ioctl_flags & FS_SYNC_FL)
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ubifs_flags |= UBIFS_SYNC_FL;
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if (ioctl_flags & FS_APPEND_FL)
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ubifs_flags |= UBIFS_APPEND_FL;
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if (ioctl_flags & FS_IMMUTABLE_FL)
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ubifs_flags |= UBIFS_IMMUTABLE_FL;
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if (ioctl_flags & FS_DIRSYNC_FL)
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ubifs_flags |= UBIFS_DIRSYNC_FL;
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return ubifs_flags;
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}
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/*
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* ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags.
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* @ubifs_flags: flags to convert
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*
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* This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl
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* flags (@FS_COMPR_FL, etc).
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*/
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static int ubifs2ioctl(int ubifs_flags)
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{
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int ioctl_flags = 0;
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if (ubifs_flags & UBIFS_COMPR_FL)
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ioctl_flags |= FS_COMPR_FL;
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if (ubifs_flags & UBIFS_SYNC_FL)
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ioctl_flags |= FS_SYNC_FL;
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if (ubifs_flags & UBIFS_APPEND_FL)
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ioctl_flags |= FS_APPEND_FL;
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if (ubifs_flags & UBIFS_IMMUTABLE_FL)
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ioctl_flags |= FS_IMMUTABLE_FL;
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if (ubifs_flags & UBIFS_DIRSYNC_FL)
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ioctl_flags |= FS_DIRSYNC_FL;
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return ioctl_flags;
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}
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static int setflags(struct inode *inode, int flags)
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{
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int oldflags, err, release;
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struct ubifs_inode *ui = ubifs_inode(inode);
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struct ubifs_info *c = inode->i_sb->s_fs_info;
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struct ubifs_budget_req req = { .dirtied_ino = 1,
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.dirtied_ino_d = ui->data_len };
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err = ubifs_budget_space(c, &req);
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if (err)
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return err;
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/*
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* The IMMUTABLE and APPEND_ONLY flags can only be changed by
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* the relevant capability.
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*/
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mutex_lock(&ui->ui_mutex);
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oldflags = ubifs2ioctl(ui->flags);
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if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
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if (!capable(CAP_LINUX_IMMUTABLE)) {
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err = -EPERM;
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goto out_unlock;
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}
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}
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ui->flags = ioctl2ubifs(flags);
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ubifs_set_inode_flags(inode);
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inode->i_ctime = current_time(inode);
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release = ui->dirty;
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mark_inode_dirty_sync(inode);
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mutex_unlock(&ui->ui_mutex);
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if (release)
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ubifs_release_budget(c, &req);
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if (IS_SYNC(inode))
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err = write_inode_now(inode, 1);
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return err;
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out_unlock:
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ubifs_err(c, "can't modify inode %lu attributes", inode->i_ino);
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mutex_unlock(&ui->ui_mutex);
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ubifs_release_budget(c, &req);
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return err;
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}
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long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int flags, err;
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struct inode *inode = file_inode(file);
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switch (cmd) {
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case FS_IOC_GETFLAGS:
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flags = ubifs2ioctl(ubifs_inode(inode)->flags);
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dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags);
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return put_user(flags, (int __user *) arg);
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case FS_IOC_SETFLAGS: {
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if (IS_RDONLY(inode))
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return -EROFS;
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if (!inode_owner_or_capable(inode))
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return -EACCES;
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if (get_user(flags, (int __user *) arg))
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return -EFAULT;
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if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS)
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return -EOPNOTSUPP;
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if (!S_ISDIR(inode->i_mode))
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flags &= ~FS_DIRSYNC_FL;
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/*
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* Make sure the file-system is read-write and make sure it
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* will not become read-only while we are changing the flags.
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*/
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err = mnt_want_write_file(file);
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if (err)
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return err;
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dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags);
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err = setflags(inode, flags);
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mnt_drop_write_file(file);
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return err;
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}
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case FS_IOC_SET_ENCRYPTION_POLICY: {
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struct ubifs_info *c = inode->i_sb->s_fs_info;
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err = ubifs_enable_encryption(c);
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if (err)
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return err;
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return fscrypt_ioctl_set_policy(file, (const void __user *)arg);
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}
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case FS_IOC_GET_ENCRYPTION_POLICY:
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return fscrypt_ioctl_get_policy(file, (void __user *)arg);
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default:
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return -ENOTTY;
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}
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}
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#ifdef CONFIG_COMPAT
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long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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switch (cmd) {
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case FS_IOC32_GETFLAGS:
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cmd = FS_IOC_GETFLAGS;
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break;
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case FS_IOC32_SETFLAGS:
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cmd = FS_IOC_SETFLAGS;
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break;
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case FS_IOC_SET_ENCRYPTION_POLICY:
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case FS_IOC_GET_ENCRYPTION_POLICY:
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break;
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default:
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return -ENOIOCTLCMD;
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}
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return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
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}
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#endif
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