mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:36:40 +07:00
d407574e79
Pull f2fs updates from Jaegeuk Kim: "New Features: - uplift filesystem encryption into fs/crypto/ - give sysfs entries to control memroy consumption Enhancements: - aio performance by preallocating blocks in ->write_iter - use writepages lock for only WB_SYNC_ALL - avoid redundant inline_data conversion - enhance forground GC - use wait_for_stable_page as possible - speed up SEEK_DATA and fiiemap Bug Fixes: - corner case in terms of -ENOSPC for inline_data - hung task caused by long latency in shrinker - corruption between atomic write and f2fs_trace_pid - avoid garbage lengths in dentries - revoke atomicly written pages if an error occurs In addition, there are various minor bug fixes and clean-ups" * tag 'for-f2fs-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (81 commits) f2fs: submit node page write bios when really required f2fs: add missing argument to f2fs_setxattr stub f2fs: fix to avoid unneeded unlock_new_inode f2fs: clean up opened code with f2fs_update_dentry f2fs: declare static functions f2fs: use cryptoapi crc32 functions f2fs: modify the readahead method in ra_node_page() f2fs crypto: sync ext4_lookup and ext4_file_open fs crypto: move per-file encryption from f2fs tree to fs/crypto f2fs: mutex can't be used by down_write_nest_lock() f2fs: recovery missing dot dentries in root directory f2fs: fix to avoid deadlock when merging inline data f2fs: introduce f2fs_flush_merged_bios for cleanup f2fs: introduce f2fs_update_data_blkaddr for cleanup f2fs crypto: fix incorrect positioning for GCing encrypted data page f2fs: fix incorrect upper bound when iterating inode mapping tree f2fs: avoid hungtask problem caused by losing wake_up f2fs: trace old block address for CoWed page f2fs: try to flush inode after merging inline data f2fs: show more info about superblock recovery ...
425 lines
11 KiB
C
425 lines
11 KiB
C
/*
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* This contains functions for filename crypto management
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*
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* Copyright (C) 2015, Google, Inc.
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* Copyright (C) 2015, Motorola Mobility
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*
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* Written by Uday Savagaonkar, 2014.
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* Modified by Jaegeuk Kim, 2015.
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*
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* This has not yet undergone a rigorous security audit.
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*/
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#include <keys/encrypted-type.h>
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#include <keys/user-type.h>
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#include <linux/scatterlist.h>
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#include <linux/ratelimit.h>
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#include <linux/fscrypto.h>
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static u32 size_round_up(size_t size, size_t blksize)
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{
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return ((size + blksize - 1) / blksize) * blksize;
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}
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/**
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* dir_crypt_complete() -
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*/
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static void dir_crypt_complete(struct crypto_async_request *req, int res)
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{
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struct fscrypt_completion_result *ecr = req->data;
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if (res == -EINPROGRESS)
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return;
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ecr->res = res;
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complete(&ecr->completion);
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}
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/**
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* fname_encrypt() -
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*
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* This function encrypts the input filename, and returns the length of the
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* ciphertext. Errors are returned as negative numbers. We trust the caller to
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* allocate sufficient memory to oname string.
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*/
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static int fname_encrypt(struct inode *inode,
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const struct qstr *iname, struct fscrypt_str *oname)
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{
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u32 ciphertext_len;
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struct skcipher_request *req = NULL;
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DECLARE_FS_COMPLETION_RESULT(ecr);
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struct fscrypt_info *ci = inode->i_crypt_info;
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struct crypto_skcipher *tfm = ci->ci_ctfm;
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int res = 0;
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char iv[FS_CRYPTO_BLOCK_SIZE];
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struct scatterlist src_sg, dst_sg;
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int padding = 4 << (ci->ci_flags & FS_POLICY_FLAGS_PAD_MASK);
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char *workbuf, buf[32], *alloc_buf = NULL;
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unsigned lim;
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lim = inode->i_sb->s_cop->max_namelen(inode);
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if (iname->len <= 0 || iname->len > lim)
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return -EIO;
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ciphertext_len = (iname->len < FS_CRYPTO_BLOCK_SIZE) ?
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FS_CRYPTO_BLOCK_SIZE : iname->len;
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ciphertext_len = size_round_up(ciphertext_len, padding);
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ciphertext_len = (ciphertext_len > lim) ? lim : ciphertext_len;
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if (ciphertext_len <= sizeof(buf)) {
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workbuf = buf;
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} else {
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alloc_buf = kmalloc(ciphertext_len, GFP_NOFS);
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if (!alloc_buf)
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return -ENOMEM;
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workbuf = alloc_buf;
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}
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/* Allocate request */
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req = skcipher_request_alloc(tfm, GFP_NOFS);
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if (!req) {
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printk_ratelimited(KERN_ERR
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"%s: crypto_request_alloc() failed\n", __func__);
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kfree(alloc_buf);
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return -ENOMEM;
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}
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skcipher_request_set_callback(req,
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CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
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dir_crypt_complete, &ecr);
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/* Copy the input */
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memcpy(workbuf, iname->name, iname->len);
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if (iname->len < ciphertext_len)
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memset(workbuf + iname->len, 0, ciphertext_len - iname->len);
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/* Initialize IV */
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memset(iv, 0, FS_CRYPTO_BLOCK_SIZE);
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/* Create encryption request */
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sg_init_one(&src_sg, workbuf, ciphertext_len);
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sg_init_one(&dst_sg, oname->name, ciphertext_len);
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skcipher_request_set_crypt(req, &src_sg, &dst_sg, ciphertext_len, iv);
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res = crypto_skcipher_encrypt(req);
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if (res == -EINPROGRESS || res == -EBUSY) {
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wait_for_completion(&ecr.completion);
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res = ecr.res;
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}
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kfree(alloc_buf);
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skcipher_request_free(req);
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if (res < 0)
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printk_ratelimited(KERN_ERR
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"%s: Error (error code %d)\n", __func__, res);
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oname->len = ciphertext_len;
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return res;
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}
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/*
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* fname_decrypt()
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* This function decrypts the input filename, and returns
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* the length of the plaintext.
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* Errors are returned as negative numbers.
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* We trust the caller to allocate sufficient memory to oname string.
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*/
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static int fname_decrypt(struct inode *inode,
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const struct fscrypt_str *iname,
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struct fscrypt_str *oname)
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{
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struct skcipher_request *req = NULL;
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DECLARE_FS_COMPLETION_RESULT(ecr);
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struct scatterlist src_sg, dst_sg;
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struct fscrypt_info *ci = inode->i_crypt_info;
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struct crypto_skcipher *tfm = ci->ci_ctfm;
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int res = 0;
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char iv[FS_CRYPTO_BLOCK_SIZE];
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unsigned lim;
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lim = inode->i_sb->s_cop->max_namelen(inode);
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if (iname->len <= 0 || iname->len > lim)
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return -EIO;
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/* Allocate request */
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req = skcipher_request_alloc(tfm, GFP_NOFS);
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if (!req) {
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printk_ratelimited(KERN_ERR
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"%s: crypto_request_alloc() failed\n", __func__);
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return -ENOMEM;
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}
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skcipher_request_set_callback(req,
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CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
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dir_crypt_complete, &ecr);
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/* Initialize IV */
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memset(iv, 0, FS_CRYPTO_BLOCK_SIZE);
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/* Create decryption request */
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sg_init_one(&src_sg, iname->name, iname->len);
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sg_init_one(&dst_sg, oname->name, oname->len);
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skcipher_request_set_crypt(req, &src_sg, &dst_sg, iname->len, iv);
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res = crypto_skcipher_decrypt(req);
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if (res == -EINPROGRESS || res == -EBUSY) {
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wait_for_completion(&ecr.completion);
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res = ecr.res;
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}
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skcipher_request_free(req);
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if (res < 0) {
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printk_ratelimited(KERN_ERR
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"%s: Error (error code %d)\n", __func__, res);
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return res;
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}
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oname->len = strnlen(oname->name, iname->len);
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return oname->len;
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}
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static const char *lookup_table =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
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/**
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* digest_encode() -
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*
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* Encodes the input digest using characters from the set [a-zA-Z0-9_+].
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* The encoded string is roughly 4/3 times the size of the input string.
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*/
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static int digest_encode(const char *src, int len, char *dst)
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{
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int i = 0, bits = 0, ac = 0;
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char *cp = dst;
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while (i < len) {
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ac += (((unsigned char) src[i]) << bits);
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bits += 8;
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do {
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*cp++ = lookup_table[ac & 0x3f];
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ac >>= 6;
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bits -= 6;
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} while (bits >= 6);
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i++;
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}
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if (bits)
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*cp++ = lookup_table[ac & 0x3f];
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return cp - dst;
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}
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static int digest_decode(const char *src, int len, char *dst)
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{
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int i = 0, bits = 0, ac = 0;
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const char *p;
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char *cp = dst;
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while (i < len) {
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p = strchr(lookup_table, src[i]);
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if (p == NULL || src[i] == 0)
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return -2;
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ac += (p - lookup_table) << bits;
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bits += 6;
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if (bits >= 8) {
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*cp++ = ac & 0xff;
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ac >>= 8;
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bits -= 8;
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}
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i++;
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}
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if (ac)
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return -1;
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return cp - dst;
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}
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u32 fscrypt_fname_encrypted_size(struct inode *inode, u32 ilen)
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{
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int padding = 32;
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struct fscrypt_info *ci = inode->i_crypt_info;
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if (ci)
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padding = 4 << (ci->ci_flags & FS_POLICY_FLAGS_PAD_MASK);
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if (ilen < FS_CRYPTO_BLOCK_SIZE)
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ilen = FS_CRYPTO_BLOCK_SIZE;
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return size_round_up(ilen, padding);
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}
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EXPORT_SYMBOL(fscrypt_fname_encrypted_size);
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/**
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* fscrypt_fname_crypto_alloc_obuff() -
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*
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* Allocates an output buffer that is sufficient for the crypto operation
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* specified by the context and the direction.
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*/
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int fscrypt_fname_alloc_buffer(struct inode *inode,
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u32 ilen, struct fscrypt_str *crypto_str)
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{
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unsigned int olen = fscrypt_fname_encrypted_size(inode, ilen);
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crypto_str->len = olen;
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if (olen < FS_FNAME_CRYPTO_DIGEST_SIZE * 2)
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olen = FS_FNAME_CRYPTO_DIGEST_SIZE * 2;
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/*
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* Allocated buffer can hold one more character to null-terminate the
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* string
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*/
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crypto_str->name = kmalloc(olen + 1, GFP_NOFS);
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if (!(crypto_str->name))
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL(fscrypt_fname_alloc_buffer);
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/**
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* fscrypt_fname_crypto_free_buffer() -
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*
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* Frees the buffer allocated for crypto operation.
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*/
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void fscrypt_fname_free_buffer(struct fscrypt_str *crypto_str)
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{
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if (!crypto_str)
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return;
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kfree(crypto_str->name);
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crypto_str->name = NULL;
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}
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EXPORT_SYMBOL(fscrypt_fname_free_buffer);
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/**
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* fscrypt_fname_disk_to_usr() - converts a filename from disk space to user
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* space
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*/
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int fscrypt_fname_disk_to_usr(struct inode *inode,
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u32 hash, u32 minor_hash,
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const struct fscrypt_str *iname,
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struct fscrypt_str *oname)
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{
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const struct qstr qname = FSTR_TO_QSTR(iname);
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char buf[24];
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int ret;
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if (fscrypt_is_dot_dotdot(&qname)) {
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oname->name[0] = '.';
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oname->name[iname->len - 1] = '.';
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oname->len = iname->len;
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return oname->len;
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}
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if (iname->len < FS_CRYPTO_BLOCK_SIZE)
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return -EUCLEAN;
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if (inode->i_crypt_info)
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return fname_decrypt(inode, iname, oname);
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if (iname->len <= FS_FNAME_CRYPTO_DIGEST_SIZE) {
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ret = digest_encode(iname->name, iname->len, oname->name);
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oname->len = ret;
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return ret;
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}
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if (hash) {
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memcpy(buf, &hash, 4);
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memcpy(buf + 4, &minor_hash, 4);
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} else {
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memset(buf, 0, 8);
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}
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memcpy(buf + 8, iname->name + iname->len - 16, 16);
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oname->name[0] = '_';
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ret = digest_encode(buf, 24, oname->name + 1);
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oname->len = ret + 1;
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return ret + 1;
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}
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EXPORT_SYMBOL(fscrypt_fname_disk_to_usr);
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/**
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* fscrypt_fname_usr_to_disk() - converts a filename from user space to disk
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* space
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*/
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int fscrypt_fname_usr_to_disk(struct inode *inode,
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const struct qstr *iname,
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struct fscrypt_str *oname)
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{
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if (fscrypt_is_dot_dotdot(iname)) {
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oname->name[0] = '.';
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oname->name[iname->len - 1] = '.';
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oname->len = iname->len;
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return oname->len;
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}
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if (inode->i_crypt_info)
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return fname_encrypt(inode, iname, oname);
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/*
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* Without a proper key, a user is not allowed to modify the filenames
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* in a directory. Consequently, a user space name cannot be mapped to
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* a disk-space name
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*/
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return -EACCES;
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}
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EXPORT_SYMBOL(fscrypt_fname_usr_to_disk);
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int fscrypt_setup_filename(struct inode *dir, const struct qstr *iname,
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int lookup, struct fscrypt_name *fname)
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{
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int ret = 0, bigname = 0;
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memset(fname, 0, sizeof(struct fscrypt_name));
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fname->usr_fname = iname;
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if (!dir->i_sb->s_cop->is_encrypted(dir) ||
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fscrypt_is_dot_dotdot(iname)) {
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fname->disk_name.name = (unsigned char *)iname->name;
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fname->disk_name.len = iname->len;
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return 0;
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}
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ret = get_crypt_info(dir);
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if (ret && ret != -EOPNOTSUPP)
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return ret;
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if (dir->i_crypt_info) {
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ret = fscrypt_fname_alloc_buffer(dir, iname->len,
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&fname->crypto_buf);
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if (ret < 0)
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return ret;
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ret = fname_encrypt(dir, iname, &fname->crypto_buf);
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if (ret < 0)
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goto errout;
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fname->disk_name.name = fname->crypto_buf.name;
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fname->disk_name.len = fname->crypto_buf.len;
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return 0;
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}
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if (!lookup)
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return -EACCES;
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/*
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* We don't have the key and we are doing a lookup; decode the
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* user-supplied name
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*/
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if (iname->name[0] == '_')
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bigname = 1;
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if ((bigname && (iname->len != 33)) || (!bigname && (iname->len > 43)))
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return -ENOENT;
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fname->crypto_buf.name = kmalloc(32, GFP_KERNEL);
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if (fname->crypto_buf.name == NULL)
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return -ENOMEM;
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ret = digest_decode(iname->name + bigname, iname->len - bigname,
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fname->crypto_buf.name);
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if (ret < 0) {
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ret = -ENOENT;
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goto errout;
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}
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fname->crypto_buf.len = ret;
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if (bigname) {
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memcpy(&fname->hash, fname->crypto_buf.name, 4);
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memcpy(&fname->minor_hash, fname->crypto_buf.name + 4, 4);
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} else {
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fname->disk_name.name = fname->crypto_buf.name;
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fname->disk_name.len = fname->crypto_buf.len;
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}
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return 0;
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errout:
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fscrypt_fname_free_buffer(&fname->crypto_buf);
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return ret;
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}
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EXPORT_SYMBOL(fscrypt_setup_filename);
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void fscrypt_free_filename(struct fscrypt_name *fname)
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{
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kfree(fname->crypto_buf.name);
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fname->crypto_buf.name = NULL;
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fname->usr_fname = NULL;
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fname->disk_name.name = NULL;
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}
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EXPORT_SYMBOL(fscrypt_free_filename);
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