1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * This file is part of UBIFS.
4  *
5  * Copyright (C) 2006-2008 Nokia Corporation.
6  * Copyright (C) 2006, 2007 University of Szeged, Hungary
7  *
8  * Authors: Zoltan Sogor
9  *          Artem Bityutskiy (Битюцкий Артём)
10  *          Adrian Hunter
11  */
12 
13 /* This file implements EXT2-compatible extended attribute ioctl() calls */
14 
15 #include <linux/compat.h>
16 #include <linux/mount.h>
17 #include <linux/fileattr.h>
18 #include "ubifs.h"
19 
20 /* Need to be kept consistent with checked flags in ioctl2ubifs() */
21 #define UBIFS_SETTABLE_IOCTL_FLAGS \
22 	(FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
23 	 FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
24 
25 /* Need to be kept consistent with checked flags in ubifs2ioctl() */
26 #define UBIFS_GETTABLE_IOCTL_FLAGS \
27 	(UBIFS_SETTABLE_IOCTL_FLAGS | FS_ENCRYPT_FL)
28 
29 /**
30  * ubifs_set_inode_flags - set VFS inode flags.
31  * @inode: VFS inode to set flags for
32  *
33  * This function propagates flags from UBIFS inode object to VFS inode object.
34  */
ubifs_set_inode_flags(struct inode * inode)35 void ubifs_set_inode_flags(struct inode *inode)
36 {
37 	unsigned int flags = ubifs_inode(inode)->flags;
38 
39 	inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC |
40 			    S_ENCRYPTED);
41 	if (flags & UBIFS_SYNC_FL)
42 		inode->i_flags |= S_SYNC;
43 	if (flags & UBIFS_APPEND_FL)
44 		inode->i_flags |= S_APPEND;
45 	if (flags & UBIFS_IMMUTABLE_FL)
46 		inode->i_flags |= S_IMMUTABLE;
47 	if (flags & UBIFS_DIRSYNC_FL)
48 		inode->i_flags |= S_DIRSYNC;
49 	if (flags & UBIFS_CRYPT_FL)
50 		inode->i_flags |= S_ENCRYPTED;
51 }
52 
53 /*
54  * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags.
55  * @ioctl_flags: flags to convert
56  *
57  * This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags
58  * (@UBIFS_COMPR_FL, etc).
59  */
ioctl2ubifs(int ioctl_flags)60 static int ioctl2ubifs(int ioctl_flags)
61 {
62 	int ubifs_flags = 0;
63 
64 	if (ioctl_flags & FS_COMPR_FL)
65 		ubifs_flags |= UBIFS_COMPR_FL;
66 	if (ioctl_flags & FS_SYNC_FL)
67 		ubifs_flags |= UBIFS_SYNC_FL;
68 	if (ioctl_flags & FS_APPEND_FL)
69 		ubifs_flags |= UBIFS_APPEND_FL;
70 	if (ioctl_flags & FS_IMMUTABLE_FL)
71 		ubifs_flags |= UBIFS_IMMUTABLE_FL;
72 	if (ioctl_flags & FS_DIRSYNC_FL)
73 		ubifs_flags |= UBIFS_DIRSYNC_FL;
74 
75 	return ubifs_flags;
76 }
77 
78 /*
79  * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags.
80  * @ubifs_flags: flags to convert
81  *
82  * This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl
83  * flags (@FS_COMPR_FL, etc).
84  */
ubifs2ioctl(int ubifs_flags)85 static int ubifs2ioctl(int ubifs_flags)
86 {
87 	int ioctl_flags = 0;
88 
89 	if (ubifs_flags & UBIFS_COMPR_FL)
90 		ioctl_flags |= FS_COMPR_FL;
91 	if (ubifs_flags & UBIFS_SYNC_FL)
92 		ioctl_flags |= FS_SYNC_FL;
93 	if (ubifs_flags & UBIFS_APPEND_FL)
94 		ioctl_flags |= FS_APPEND_FL;
95 	if (ubifs_flags & UBIFS_IMMUTABLE_FL)
96 		ioctl_flags |= FS_IMMUTABLE_FL;
97 	if (ubifs_flags & UBIFS_DIRSYNC_FL)
98 		ioctl_flags |= FS_DIRSYNC_FL;
99 	if (ubifs_flags & UBIFS_CRYPT_FL)
100 		ioctl_flags |= FS_ENCRYPT_FL;
101 
102 	return ioctl_flags;
103 }
104 
setflags(struct inode * inode,int flags)105 static int setflags(struct inode *inode, int flags)
106 {
107 	int err, release;
108 	struct ubifs_inode *ui = ubifs_inode(inode);
109 	struct ubifs_info *c = inode->i_sb->s_fs_info;
110 	struct ubifs_budget_req req = { .dirtied_ino = 1,
111 			.dirtied_ino_d = ALIGN(ui->data_len, 8) };
112 
113 	err = ubifs_budget_space(c, &req);
114 	if (err)
115 		return err;
116 
117 	mutex_lock(&ui->ui_mutex);
118 	ui->flags &= ~ioctl2ubifs(UBIFS_SETTABLE_IOCTL_FLAGS);
119 	ui->flags |= ioctl2ubifs(flags);
120 	ubifs_set_inode_flags(inode);
121 	inode_set_ctime_current(inode);
122 	release = ui->dirty;
123 	mark_inode_dirty_sync(inode);
124 	mutex_unlock(&ui->ui_mutex);
125 
126 	if (release)
127 		ubifs_release_budget(c, &req);
128 	if (IS_SYNC(inode))
129 		err = write_inode_now(inode, 1);
130 	return err;
131 }
132 
ubifs_fileattr_get(struct dentry * dentry,struct fileattr * fa)133 int ubifs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
134 {
135 	struct inode *inode = d_inode(dentry);
136 	int flags = ubifs2ioctl(ubifs_inode(inode)->flags);
137 
138 	if (d_is_special(dentry))
139 		return -ENOTTY;
140 
141 	dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags);
142 	fileattr_fill_flags(fa, flags);
143 
144 	return 0;
145 }
146 
ubifs_fileattr_set(struct mnt_idmap * idmap,struct dentry * dentry,struct fileattr * fa)147 int ubifs_fileattr_set(struct mnt_idmap *idmap,
148 		       struct dentry *dentry, struct fileattr *fa)
149 {
150 	struct inode *inode = d_inode(dentry);
151 	int flags = fa->flags;
152 
153 	if (d_is_special(dentry))
154 		return -ENOTTY;
155 
156 	if (fileattr_has_fsx(fa))
157 		return -EOPNOTSUPP;
158 
159 	if (flags & ~UBIFS_GETTABLE_IOCTL_FLAGS)
160 		return -EOPNOTSUPP;
161 
162 	flags &= UBIFS_SETTABLE_IOCTL_FLAGS;
163 
164 	if (!S_ISDIR(inode->i_mode))
165 		flags &= ~FS_DIRSYNC_FL;
166 
167 	dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags);
168 	return setflags(inode, flags);
169 }
170 
ubifs_ioctl(struct file * file,unsigned int cmd,unsigned long arg)171 long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
172 {
173 	int err;
174 	struct inode *inode = file_inode(file);
175 
176 	switch (cmd) {
177 	case FS_IOC_SET_ENCRYPTION_POLICY: {
178 		struct ubifs_info *c = inode->i_sb->s_fs_info;
179 
180 		err = ubifs_enable_encryption(c);
181 		if (err)
182 			return err;
183 
184 		return fscrypt_ioctl_set_policy(file, (const void __user *)arg);
185 	}
186 	case FS_IOC_GET_ENCRYPTION_POLICY:
187 		return fscrypt_ioctl_get_policy(file, (void __user *)arg);
188 
189 	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
190 		return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg);
191 
192 	case FS_IOC_ADD_ENCRYPTION_KEY:
193 		return fscrypt_ioctl_add_key(file, (void __user *)arg);
194 
195 	case FS_IOC_REMOVE_ENCRYPTION_KEY:
196 		return fscrypt_ioctl_remove_key(file, (void __user *)arg);
197 
198 	case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
199 		return fscrypt_ioctl_remove_key_all_users(file,
200 							  (void __user *)arg);
201 	case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
202 		return fscrypt_ioctl_get_key_status(file, (void __user *)arg);
203 
204 	case FS_IOC_GET_ENCRYPTION_NONCE:
205 		return fscrypt_ioctl_get_nonce(file, (void __user *)arg);
206 
207 	default:
208 		return -ENOTTY;
209 	}
210 }
211 
212 #ifdef CONFIG_COMPAT
ubifs_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)213 long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
214 {
215 	switch (cmd) {
216 	case FS_IOC32_GETFLAGS:
217 		cmd = FS_IOC_GETFLAGS;
218 		break;
219 	case FS_IOC32_SETFLAGS:
220 		cmd = FS_IOC_SETFLAGS;
221 		break;
222 	case FS_IOC_SET_ENCRYPTION_POLICY:
223 	case FS_IOC_GET_ENCRYPTION_POLICY:
224 	case FS_IOC_GET_ENCRYPTION_POLICY_EX:
225 	case FS_IOC_ADD_ENCRYPTION_KEY:
226 	case FS_IOC_REMOVE_ENCRYPTION_KEY:
227 	case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
228 	case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
229 	case FS_IOC_GET_ENCRYPTION_NONCE:
230 		break;
231 	default:
232 		return -ENOIOCTLCMD;
233 	}
234 	return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
235 }
236 #endif
237