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-----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEK2m5VNv+CHkogTfJ8vlZVpUNgaMFAloI8AUACgkQ8vlZVpUN gaMdjgf8CCW7UhPjoZYwF8sUNtAaX9+JZT1maOcXUhpJ3vRQiRn+AzRH6yBYMm79 +NZBwVlk4dlEe55Wh4yFIStMAstqzCrke4C9CSbExjgHNsJdU4znyYuLRMbLfyO0 6c4NObiAIKJdW1/te1aN90keGC6min8pBZot+FqZsRr+Kq2+IOtM43JAv7efOLev v3LCjUf9JKxatoB8tgw4AJRa1p18p7D2APWTG05VlFq63TjhVIYNvvwcQlizLwGY cuEq3X59FbFdX06fJnucujU3WP3ES4/3rhufBK4NNaec5e5dbnH2KlAx7J5SyMIZ 0qUFB/dmXDSb3gsfScSGo1F71Ad0CA== =asAm -----END PGP SIGNATURE----- Merge tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt Pull fscrypt updates from Ted Ts'o: "Lots of cleanups, mostly courtesy by Eric Biggers" * tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt: fscrypt: lock mutex before checking for bounce page pool fscrypt: add a documentation file for filesystem-level encryption ext4: switch to fscrypt_prepare_setattr() ext4: switch to fscrypt_prepare_lookup() ext4: switch to fscrypt_prepare_rename() ext4: switch to fscrypt_prepare_link() ext4: switch to fscrypt_file_open() fscrypt: new helper function - fscrypt_prepare_setattr() fscrypt: new helper function - fscrypt_prepare_lookup() fscrypt: new helper function - fscrypt_prepare_rename() fscrypt: new helper function - fscrypt_prepare_link() fscrypt: new helper function - fscrypt_file_open() fscrypt: new helper function - fscrypt_require_key() fscrypt: remove unneeded empty fscrypt_operations structs fscrypt: remove ->is_encrypted() fscrypt: switch from ->is_encrypted() to IS_ENCRYPTED() fs, fscrypt: add an S_ENCRYPTED inode flag fscrypt: clean up include file mess
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "ubifs.h"
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static int ubifs_crypt_get_context(struct inode *inode, void *ctx, size_t len)
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{
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return ubifs_xattr_get(inode, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT,
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ctx, len);
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}
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static int ubifs_crypt_set_context(struct inode *inode, const void *ctx,
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size_t len, void *fs_data)
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{
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/*
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* Creating an encryption context is done unlocked since we
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* operate on a new inode which is not visible to other users
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* at this point. So, no need to check whether inode is locked.
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*/
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return ubifs_xattr_set(inode, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT,
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ctx, len, 0, false);
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}
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static bool ubifs_crypt_empty_dir(struct inode *inode)
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{
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return ubifs_check_dir_empty(inode) == 0;
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}
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static unsigned int ubifs_crypt_max_namelen(struct inode *inode)
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{
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if (S_ISLNK(inode->i_mode))
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return UBIFS_MAX_INO_DATA;
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else
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return UBIFS_MAX_NLEN;
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}
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int ubifs_encrypt(const struct inode *inode, struct ubifs_data_node *dn,
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unsigned int in_len, unsigned int *out_len, int block)
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{
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struct ubifs_info *c = inode->i_sb->s_fs_info;
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void *p = &dn->data;
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struct page *ret;
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unsigned int pad_len = round_up(in_len, UBIFS_CIPHER_BLOCK_SIZE);
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ubifs_assert(pad_len <= *out_len);
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dn->compr_size = cpu_to_le16(in_len);
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/* pad to full block cipher length */
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if (pad_len != in_len)
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memset(p + in_len, 0, pad_len - in_len);
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ret = fscrypt_encrypt_page(inode, virt_to_page(&dn->data), pad_len,
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offset_in_page(&dn->data), block, GFP_NOFS);
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if (IS_ERR(ret)) {
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ubifs_err(c, "fscrypt_encrypt_page failed: %ld", PTR_ERR(ret));
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return PTR_ERR(ret);
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}
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*out_len = pad_len;
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return 0;
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}
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int ubifs_decrypt(const struct inode *inode, struct ubifs_data_node *dn,
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unsigned int *out_len, int block)
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{
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struct ubifs_info *c = inode->i_sb->s_fs_info;
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int err;
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unsigned int clen = le16_to_cpu(dn->compr_size);
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unsigned int dlen = *out_len;
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if (clen <= 0 || clen > UBIFS_BLOCK_SIZE || clen > dlen) {
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ubifs_err(c, "bad compr_size: %i", clen);
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return -EINVAL;
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}
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ubifs_assert(dlen <= UBIFS_BLOCK_SIZE);
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err = fscrypt_decrypt_page(inode, virt_to_page(&dn->data), dlen,
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offset_in_page(&dn->data), block);
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if (err) {
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ubifs_err(c, "fscrypt_decrypt_page failed: %i", err);
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return err;
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}
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*out_len = clen;
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return 0;
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}
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const struct fscrypt_operations ubifs_crypt_operations = {
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.flags = FS_CFLG_OWN_PAGES,
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.key_prefix = "ubifs:",
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.get_context = ubifs_crypt_get_context,
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.set_context = ubifs_crypt_set_context,
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.empty_dir = ubifs_crypt_empty_dir,
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.max_namelen = ubifs_crypt_max_namelen,
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};
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