Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * fs/crypto/hooks.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Encryption hooks for higher-level filesystem operations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/key.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include "fscrypt_private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * fscrypt_file_open() - prepare to open a possibly-encrypted regular file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  * @inode: the inode being opened
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * @filp: the struct file being set up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * Currently, an encrypted regular file can only be opened if its encryption key
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  * is available; access to the raw encrypted contents is not supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * Therefore, we first set up the inode's encryption key (if not already done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * and return an error if it's unavailable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * We also verify that if the parent directory (from the path via which the file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  * is being opened) is encrypted, then the inode being opened uses the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  * encryption policy.  This is needed as part of the enforcement that all files
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  * in an encrypted directory tree use the same encryption policy, as a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * protection against certain types of offline attacks.  Note that this check is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * needed even when opening an *unencrypted* file, since it's forbidden to have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * an unencrypted file in an encrypted directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) int fscrypt_file_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct dentry *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	err = fscrypt_require_key(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	dir = dget_parent(file_dentry(filp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	if (IS_ENCRYPTED(d_inode(dir)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	    !fscrypt_has_permitted_context(d_inode(dir), inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		fscrypt_warn(inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			     "Inconsistent encryption context (parent directory: %lu)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			     d_inode(dir)->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		err = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	dput(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) EXPORT_SYMBOL_GPL(fscrypt_file_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) int __fscrypt_prepare_link(struct inode *inode, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			   struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	if (fscrypt_is_nokey_name(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		return -ENOKEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	 * We don't need to separately check that the directory inode's key is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	 * available, as it's implied by the dentry not being a no-key name.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	if (!fscrypt_has_permitted_context(dir, inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		return -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) EXPORT_SYMBOL_GPL(__fscrypt_prepare_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 			     struct inode *new_dir, struct dentry *new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			     unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (fscrypt_is_nokey_name(old_dentry) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	    fscrypt_is_nokey_name(new_dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		return -ENOKEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	 * We don't need to separately check that the directory inodes' keys are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	 * available, as it's implied by the dentries not being no-key names.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (old_dir != new_dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		if (IS_ENCRYPTED(new_dir) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		    !fscrypt_has_permitted_context(new_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 						   d_inode(old_dentry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			return -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		if ((flags & RENAME_EXCHANGE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		    IS_ENCRYPTED(old_dir) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		    !fscrypt_has_permitted_context(old_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 						   d_inode(new_dentry)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 			return -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) EXPORT_SYMBOL_GPL(__fscrypt_prepare_rename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 			     struct fscrypt_name *fname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	int err = fscrypt_setup_filename(dir, &dentry->d_name, 1, fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (err && err != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (fname->is_nokey_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		spin_lock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		dentry->d_flags |= DCACHE_NOKEY_NAME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		spin_unlock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) EXPORT_SYMBOL_GPL(__fscrypt_prepare_lookup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int __fscrypt_prepare_readdir(struct inode *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	return fscrypt_get_encryption_info(dir, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) EXPORT_SYMBOL_GPL(__fscrypt_prepare_readdir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) int __fscrypt_prepare_setattr(struct dentry *dentry, struct iattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (attr->ia_valid & ATTR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return fscrypt_require_key(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) EXPORT_SYMBOL_GPL(__fscrypt_prepare_setattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  * fscrypt_prepare_setflags() - prepare to change flags with FS_IOC_SETFLAGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * @inode: the inode on which flags are being changed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  * @oldflags: the old flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * @flags: the new flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)  * The caller should be holding i_rwsem for write.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)  * Return: 0 on success; -errno if the flags change isn't allowed or if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)  *	   another error occurs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) int fscrypt_prepare_setflags(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			     unsigned int oldflags, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	struct fscrypt_info *ci;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	struct key *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	struct fscrypt_master_key *mk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	 * When the CASEFOLD flag is set on an encrypted directory, we must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	 * derive the secret key needed for the dirhash.  This is only possible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	 * if the directory uses a v2 encryption policy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (IS_ENCRYPTED(inode) && (flags & ~oldflags & FS_CASEFOLD_FL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		err = fscrypt_require_key(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		ci = inode->i_crypt_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		if (ci->ci_policy.version != FSCRYPT_POLICY_V2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		key = ci->ci_master_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		mk = key->payload.data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		down_read(&key->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		if (is_master_key_secret_present(&mk->mk_secret))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			err = fscrypt_derive_dirhash_key(ci, mk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 			err = -ENOKEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		up_read(&key->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  * fscrypt_prepare_symlink() - prepare to create a possibly-encrypted symlink
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)  * @dir: directory in which the symlink is being created
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)  * @target: plaintext symlink target
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)  * @len: length of @target excluding null terminator
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)  * @max_len: space the filesystem has available to store the symlink target
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)  * @disk_link: (out) the on-disk symlink target being prepared
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)  * This function computes the size the symlink target will require on-disk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)  * stores it in @disk_link->len, and validates it against @max_len.  An
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)  * encrypted symlink may be longer than the original.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)  * Additionally, @disk_link->name is set to @target if the symlink will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)  * unencrypted, but left NULL if the symlink will be encrypted.  For encrypted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)  * symlinks, the filesystem must call fscrypt_encrypt_symlink() to create the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)  * on-disk target later.  (The reason for the two-step process is that some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)  * filesystems need to know the size of the symlink target before creating the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)  * inode, e.g. to determine whether it will be a "fast" or "slow" symlink.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)  * Return: 0 on success, -ENAMETOOLONG if the symlink target is too long,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  * -ENOKEY if the encryption key is missing, or another -errno code if a problem
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  * occurred while setting up the encryption key.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int fscrypt_prepare_symlink(struct inode *dir, const char *target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			    unsigned int len, unsigned int max_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			    struct fscrypt_str *disk_link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	const union fscrypt_policy *policy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	 * To calculate the size of the encrypted symlink target we need to know
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 * the amount of NUL padding, which is determined by the flags set in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 * the encryption policy which will be inherited from the directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	policy = fscrypt_policy_to_inherit(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (policy == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		/* Not encrypted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		disk_link->name = (unsigned char *)target;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		disk_link->len = len + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if (disk_link->len > max_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (IS_ERR(policy))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return PTR_ERR(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	 * Calculate the size of the encrypted symlink and verify it won't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	 * exceed max_len.  Note that for historical reasons, encrypted symlink
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	 * targets are prefixed with the ciphertext length, despite this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	 * actually being redundant with i_size.  This decreases by 2 bytes the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	 * longest symlink target we can accept.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 * We could recover 1 byte by not counting a null terminator, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	 * counting it (even though it is meaningless for ciphertext) is simpler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 * for now since filesystems will assume it is there and subtract it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	if (!fscrypt_fname_encrypted_size(policy, len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 					  max_len - sizeof(struct fscrypt_symlink_data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 					  &disk_link->len))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	disk_link->len += sizeof(struct fscrypt_symlink_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	disk_link->name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) EXPORT_SYMBOL_GPL(fscrypt_prepare_symlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) int __fscrypt_encrypt_symlink(struct inode *inode, const char *target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			      unsigned int len, struct fscrypt_str *disk_link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	struct qstr iname = QSTR_INIT(target, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	struct fscrypt_symlink_data *sd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	unsigned int ciphertext_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	 * fscrypt_prepare_new_inode() should have already set up the new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	 * symlink inode's encryption key.  We don't wait until now to do it,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	 * since we may be in a filesystem transaction now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	if (WARN_ON_ONCE(!fscrypt_has_encryption_key(inode)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		return -ENOKEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (disk_link->name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		/* filesystem-provided buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		sd = (struct fscrypt_symlink_data *)disk_link->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		sd = kmalloc(disk_link->len, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		if (!sd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	ciphertext_len = disk_link->len - sizeof(*sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	sd->len = cpu_to_le16(ciphertext_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	err = fscrypt_fname_encrypt(inode, &iname, sd->encrypted_path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 				    ciphertext_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		goto err_free_sd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	 * Null-terminating the ciphertext doesn't make sense, but we still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	 * count the null terminator in the length, so we might as well
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	 * initialize it just in case the filesystem writes it out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	sd->encrypted_path[ciphertext_len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	/* Cache the plaintext symlink target for later use by get_link() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	inode->i_link = kmemdup(target, len + 1, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	if (!inode->i_link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		goto err_free_sd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (!disk_link->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		disk_link->name = (unsigned char *)sd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) err_free_sd:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (!disk_link->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		kfree(sd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) EXPORT_SYMBOL_GPL(__fscrypt_encrypt_symlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)  * fscrypt_get_symlink() - get the target of an encrypted symlink
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)  * @inode: the symlink inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)  * @caddr: the on-disk contents of the symlink
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)  * @max_size: size of @caddr buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)  * @done: if successful, will be set up to free the returned target if needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)  * If the symlink's encryption key is available, we decrypt its target.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)  * Otherwise, we encode its target for presentation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)  * This may sleep, so the filesystem must have dropped out of RCU mode already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)  * Return: the presentable symlink target or an ERR_PTR()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) const char *fscrypt_get_symlink(struct inode *inode, const void *caddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 				unsigned int max_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 				struct delayed_call *done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	const struct fscrypt_symlink_data *sd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	struct fscrypt_str cstr, pstr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	bool has_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	/* This is for encrypted symlinks only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (WARN_ON(!IS_ENCRYPTED(inode)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/* If the decrypted target is already cached, just return it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	pstr.name = READ_ONCE(inode->i_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if (pstr.name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		return pstr.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	 * Try to set up the symlink's encryption key, but we can continue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	 * regardless of whether the key is available or not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	err = fscrypt_get_encryption_info(inode, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	has_key = fscrypt_has_encryption_key(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	 * For historical reasons, encrypted symlink targets are prefixed with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	 * the ciphertext length, even though this is redundant with i_size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	if (max_size < sizeof(*sd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 		return ERR_PTR(-EUCLEAN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	sd = caddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	cstr.name = (unsigned char *)sd->encrypted_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	cstr.len = le16_to_cpu(sd->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	if (cstr.len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 		return ERR_PTR(-EUCLEAN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	if (cstr.len + sizeof(*sd) - 1 > max_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		return ERR_PTR(-EUCLEAN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	err = fscrypt_fname_alloc_buffer(cstr.len, &pstr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	err = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		goto err_kfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	err = -EUCLEAN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	if (pstr.name[0] == '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		goto err_kfree;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	pstr.name[pstr.len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	 * Cache decrypted symlink targets in i_link for later use.  Don't cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	 * symlink targets encoded without the key, since those become outdated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	 * once the key is added.  This pairs with the READ_ONCE() above and in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	 * the VFS path lookup code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	if (!has_key ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	    cmpxchg_release(&inode->i_link, NULL, pstr.name) != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		set_delayed_call(done, kfree_link, pstr.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	return pstr.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) err_kfree:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	kfree(pstr.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) EXPORT_SYMBOL_GPL(fscrypt_get_symlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)  * fscrypt_symlink_getattr() - set the correct st_size for encrypted symlinks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)  * @path: the path for the encrypted symlink being queried
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)  * @stat: the struct being filled with the symlink's attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)  * Override st_size of encrypted symlinks to be the length of the decrypted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)  * symlink target (or the no-key encoded symlink target, if the key is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)  * unavailable) rather than the length of the encrypted symlink target.  This is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)  * necessary for st_size to match the symlink target that userspace actually
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)  * sees.  POSIX requires this, and some userspace programs depend on it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)  * This requires reading the symlink target from disk if needed, setting up the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)  * inode's encryption key if possible, and then decrypting or encoding the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)  * symlink target.  This makes lstat() more heavyweight than is normally the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)  * case.  However, decrypted symlink targets will be cached in ->i_link, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)  * usually the symlink won't have to be read and decrypted again later if/when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)  * it is actually followed, readlink() is called, or lstat() is called again.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406)  * Return: 0 on success, -errno on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) int fscrypt_symlink_getattr(const struct path *path, struct kstat *stat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	struct dentry *dentry = path->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 	struct inode *inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	const char *link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	DEFINE_DELAYED_CALL(done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	 * To get the symlink target that userspace will see (whether it's the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	 * decrypted target or the no-key encoded target), we can just get it in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	 * the same way the VFS does during path resolution and readlink().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	link = READ_ONCE(inode->i_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	if (!link) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		link = inode->i_op->get_link(dentry, inode, &done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		if (IS_ERR(link))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 			return PTR_ERR(link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	stat->size = strlen(link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	do_delayed_call(&done);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) EXPORT_SYMBOL_GPL(fscrypt_symlink_getattr);