forked from Minki/linux
713346ca1d
The ubifs_compress() function does not compress the data When the data length is short than 128 bytes or the compressed data length is not ideal.It cause that the compressed length of the truncated data in the truncate_data_node() function may be greater than the length of the raw data read from the flash. The above two lengths are transferred to the ubifs_encrypt() function as parameters. This may lead to assertion fails and then the file system becomes read-only. This patch use the actual length of the data in the memory as the input parameter for assert comparison, which avoids the problem. Link: https://bugzilla.kernel.org/show_bug.cgi?id=216213 Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
97 lines
2.7 KiB
C
97 lines
2.7 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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/**
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* ubifs_encrypt - Encrypt data.
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* @inode: inode which refers to the data node
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* @dn: data node to encrypt
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* @in_len: length of data to be compressed
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* @out_len: allocated memory size for the data area of @dn
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* @block: logical block number of the block
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*
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* This function encrypt a possibly-compressed data in the data node.
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* The encrypted data length will store in @out_len.
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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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unsigned int pad_len = round_up(in_len, UBIFS_CIPHER_BLOCK_SIZE);
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int err;
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ubifs_assert(c, 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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err = fscrypt_encrypt_block_inplace(inode, virt_to_page(p), pad_len,
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offset_in_page(p), block, GFP_NOFS);
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if (err) {
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ubifs_err(c, "fscrypt_encrypt_block_inplace() failed: %d", err);
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return err;
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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(c, dlen <= UBIFS_BLOCK_SIZE);
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err = fscrypt_decrypt_block_inplace(inode, virt_to_page(&dn->data),
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dlen, offset_in_page(&dn->data),
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block);
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if (err) {
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ubifs_err(c, "fscrypt_decrypt_block_inplace() failed: %d", 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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};
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