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ext4 crypto: migrate into vfs's crypto engine 

This patch removes the most parts of internal crypto codes.
And then, it modifies and adds some ext4-specific crypt codes to use the generic
facility.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jaegeuk Kim 2016-07-10 14:01:03 -04:00 коммит произвёл Theodore Ts'o
Родитель ff0031d848
Коммит a7550b30ab
19 изменённых файлов: 303 добавлений и 2003 удалений
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12
fs/ext4/Kconfig
Просмотреть файл

@ -99,17 +99,9 @@ config EXT4_FS_SECURITY
extended attributes for file security labels, say N.
config EXT4_ENCRYPTION
tristate "Ext4 Encryption"
bool "Ext4 Encryption"
depends on EXT4_FS
select CRYPTO_AES
select CRYPTO_CBC
select CRYPTO_ECB
select CRYPTO_XTS
select CRYPTO_CTS
select CRYPTO_CTR
select CRYPTO_SHA256
select KEYS
select ENCRYPTED_KEYS
select FS_ENCRYPTION
help
Enable encryption of ext4 files and directories. This
feature is similar to ecryptfs, but it is more memory

2
fs/ext4/Makefile
Просмотреть файл

@ -12,5 +12,3 @@ ext4-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o page-io.o \
ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
ext4-$(CONFIG_EXT4_FS_ENCRYPTION) += crypto_policy.o crypto.o \
crypto_key.o crypto_fname.o

536
fs/ext4/crypto.c
Просмотреть файл

@ -1,536 +0,0 @@
/*
* linux/fs/ext4/crypto.c
*
* Copyright (C) 2015, Google, Inc.
*
* This contains encryption functions for ext4
*
* Written by Michael Halcrow, 2014.
*
* Filename encryption additions
* Uday Savagaonkar, 2014
* Encryption policy handling additions
* Ildar Muslukhov, 2014
*
* This has not yet undergone a rigorous security audit.
*
* The usage of AES-XTS should conform to recommendations in NIST
* Special Publication 800-38E and IEEE P1619/D16.
*/
#include <crypto/skcipher.h>
#include <keys/user-type.h>
#include <keys/encrypted-type.h>
#include <linux/ecryptfs.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/key.h>
#include <linux/list.h>
#include <linux/mempool.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/spinlock_types.h>
#include <linux/namei.h>
#include "ext4_extents.h"
#include "xattr.h"
/* Encryption added and removed here! (L: */
static unsigned int num_prealloc_crypto_pages = 32;
static unsigned int num_prealloc_crypto_ctxs = 128;
module_param(num_prealloc_crypto_pages, uint, 0444);
MODULE_PARM_DESC(num_prealloc_crypto_pages,
"Number of crypto pages to preallocate");
module_param(num_prealloc_crypto_ctxs, uint, 0444);
MODULE_PARM_DESC(num_prealloc_crypto_ctxs,
"Number of crypto contexts to preallocate");
static mempool_t *ext4_bounce_page_pool;
static LIST_HEAD(ext4_free_crypto_ctxs);
static DEFINE_SPINLOCK(ext4_crypto_ctx_lock);
static struct kmem_cache *ext4_crypto_ctx_cachep;
struct kmem_cache *ext4_crypt_info_cachep;
/**
* ext4_release_crypto_ctx() - Releases an encryption context
* @ctx: The encryption context to release.
*
* If the encryption context was allocated from the pre-allocated pool, returns
* it to that pool. Else, frees it.
*
* If there's a bounce page in the context, this frees that.
*/
void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx)
{
unsigned long flags;
if (ctx->flags & EXT4_WRITE_PATH_FL && ctx->w.bounce_page)
mempool_free(ctx->w.bounce_page, ext4_bounce_page_pool);
ctx->w.bounce_page = NULL;
ctx->w.control_page = NULL;
if (ctx->flags & EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL) {
kmem_cache_free(ext4_crypto_ctx_cachep, ctx);
} else {
spin_lock_irqsave(&ext4_crypto_ctx_lock, flags);
list_add(&ctx->free_list, &ext4_free_crypto_ctxs);
spin_unlock_irqrestore(&ext4_crypto_ctx_lock, flags);
}
}
/**
* ext4_get_crypto_ctx() - Gets an encryption context
* @inode: The inode for which we are doing the crypto
*
* Allocates and initializes an encryption context.
*
* Return: An allocated and initialized encryption context on success; error
* value or NULL otherwise.
*/
struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode,
gfp_t gfp_flags)
{
struct ext4_crypto_ctx *ctx = NULL;
int res = 0;
unsigned long flags;
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
if (ci == NULL)
return ERR_PTR(-ENOKEY);
/*
* We first try getting the ctx from a free list because in
* the common case the ctx will have an allocated and
* initialized crypto tfm, so it's probably a worthwhile
* optimization. For the bounce page, we first try getting it
* from the kernel allocator because that's just about as fast
* as getting it from a list and because a cache of free pages
* should generally be a "last resort" option for a filesystem
* to be able to do its job.
*/
spin_lock_irqsave(&ext4_crypto_ctx_lock, flags);
ctx = list_first_entry_or_null(&ext4_free_crypto_ctxs,
struct ext4_crypto_ctx, free_list);
if (ctx)
list_del(&ctx->free_list);
spin_unlock_irqrestore(&ext4_crypto_ctx_lock, flags);
if (!ctx) {
ctx = kmem_cache_zalloc(ext4_crypto_ctx_cachep, gfp_flags);
if (!ctx) {
res = -ENOMEM;
goto out;
}
ctx->flags |= EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL;
} else {
ctx->flags &= ~EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL;
}
ctx->flags &= ~EXT4_WRITE_PATH_FL;
out:
if (res) {
if (!IS_ERR_OR_NULL(ctx))
ext4_release_crypto_ctx(ctx);
ctx = ERR_PTR(res);
}
return ctx;
}
struct workqueue_struct *ext4_read_workqueue;
static DEFINE_MUTEX(crypto_init);
/**
* ext4_exit_crypto() - Shutdown the ext4 encryption system
*/
void ext4_exit_crypto(void)
{
struct ext4_crypto_ctx *pos, *n;
list_for_each_entry_safe(pos, n, &ext4_free_crypto_ctxs, free_list)
kmem_cache_free(ext4_crypto_ctx_cachep, pos);
INIT_LIST_HEAD(&ext4_free_crypto_ctxs);
if (ext4_bounce_page_pool)
mempool_destroy(ext4_bounce_page_pool);
ext4_bounce_page_pool = NULL;
if (ext4_read_workqueue)
destroy_workqueue(ext4_read_workqueue);
ext4_read_workqueue = NULL;
if (ext4_crypto_ctx_cachep)
kmem_cache_destroy(ext4_crypto_ctx_cachep);
ext4_crypto_ctx_cachep = NULL;
if (ext4_crypt_info_cachep)
kmem_cache_destroy(ext4_crypt_info_cachep);
ext4_crypt_info_cachep = NULL;
}
/**
* ext4_init_crypto() - Set up for ext4 encryption.
*
* We only call this when we start accessing encrypted files, since it
* results in memory getting allocated that wouldn't otherwise be used.
*
* Return: Zero on success, non-zero otherwise.
*/
int ext4_init_crypto(void)
{
int i, res = -ENOMEM;
mutex_lock(&crypto_init);
if (ext4_read_workqueue)
goto already_initialized;
ext4_read_workqueue = alloc_workqueue("ext4_crypto", WQ_HIGHPRI, 0);
if (!ext4_read_workqueue)
goto fail;
ext4_crypto_ctx_cachep = KMEM_CACHE(ext4_crypto_ctx,
SLAB_RECLAIM_ACCOUNT);
if (!ext4_crypto_ctx_cachep)
goto fail;
ext4_crypt_info_cachep = KMEM_CACHE(ext4_crypt_info,
SLAB_RECLAIM_ACCOUNT);
if (!ext4_crypt_info_cachep)
goto fail;
for (i = 0; i < num_prealloc_crypto_ctxs; i++) {
struct ext4_crypto_ctx *ctx;
ctx = kmem_cache_zalloc(ext4_crypto_ctx_cachep, GFP_NOFS);
if (!ctx) {
res = -ENOMEM;
goto fail;
}
list_add(&ctx->free_list, &ext4_free_crypto_ctxs);
}
ext4_bounce_page_pool =
mempool_create_page_pool(num_prealloc_crypto_pages, 0);
if (!ext4_bounce_page_pool) {
res = -ENOMEM;
goto fail;
}
already_initialized:
mutex_unlock(&crypto_init);
return 0;
fail:
ext4_exit_crypto();
mutex_unlock(&crypto_init);
return res;
}
void ext4_restore_control_page(struct page *data_page)
{
struct ext4_crypto_ctx *ctx =
(struct ext4_crypto_ctx *)page_private(data_page);
set_page_private(data_page, (unsigned long)NULL);
ClearPagePrivate(data_page);
unlock_page(data_page);
ext4_release_crypto_ctx(ctx);
}
/**
* ext4_crypt_complete() - The completion callback for page encryption
* @req: The asynchronous encryption request context
* @res: The result of the encryption operation
*/
static void ext4_crypt_complete(struct crypto_async_request *req, int res)
{
struct ext4_completion_result *ecr = req->data;
if (res == -EINPROGRESS)
return;
ecr->res = res;
complete(&ecr->completion);
}
typedef enum {
EXT4_DECRYPT = 0,
EXT4_ENCRYPT,
} ext4_direction_t;
static int ext4_page_crypto(struct inode *inode,
ext4_direction_t rw,
pgoff_t index,
struct page *src_page,
struct page *dest_page,
gfp_t gfp_flags)
{
u8 xts_tweak[EXT4_XTS_TWEAK_SIZE];
struct skcipher_request *req = NULL;
DECLARE_EXT4_COMPLETION_RESULT(ecr);
struct scatterlist dst, src;
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
struct crypto_skcipher *tfm = ci->ci_ctfm;
int res = 0;
req = skcipher_request_alloc(tfm, gfp_flags);
if (!req) {
printk_ratelimited(KERN_ERR
"%s: crypto_request_alloc() failed\n",
__func__);
return -ENOMEM;
}
skcipher_request_set_callback(
req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ext4_crypt_complete, &ecr);
BUILD_BUG_ON(EXT4_XTS_TWEAK_SIZE < sizeof(index));
memcpy(xts_tweak, &index, sizeof(index));
memset(&xts_tweak[sizeof(index)], 0,
EXT4_XTS_TWEAK_SIZE - sizeof(index));
sg_init_table(&dst, 1);
sg_set_page(&dst, dest_page, PAGE_SIZE, 0);
sg_init_table(&src, 1);
sg_set_page(&src, src_page, PAGE_SIZE, 0);
skcipher_request_set_crypt(req, &src, &dst, PAGE_SIZE,
xts_tweak);
if (rw == EXT4_DECRYPT)
res = crypto_skcipher_decrypt(req);
else
res = crypto_skcipher_encrypt(req);
if (res == -EINPROGRESS || res == -EBUSY) {
wait_for_completion(&ecr.completion);
res = ecr.res;
}
skcipher_request_free(req);
if (res) {
printk_ratelimited(
KERN_ERR
"%s: crypto_skcipher_encrypt() returned %d\n",
__func__, res);
return res;
}
return 0;
}
static struct page *alloc_bounce_page(struct ext4_crypto_ctx *ctx,
gfp_t gfp_flags)
{
ctx->w.bounce_page = mempool_alloc(ext4_bounce_page_pool, gfp_flags);
if (ctx->w.bounce_page == NULL)
return ERR_PTR(-ENOMEM);
ctx->flags |= EXT4_WRITE_PATH_FL;
return ctx->w.bounce_page;
}
/**
* ext4_encrypt() - Encrypts a page
* @inode: The inode for which the encryption should take place
* @plaintext_page: The page to encrypt. Must be locked.
*
* Allocates a ciphertext page and encrypts plaintext_page into it using the ctx
* encryption context.
*
* Called on the page write path. The caller must call
* ext4_restore_control_page() on the returned ciphertext page to
* release the bounce buffer and the encryption context.
*
* Return: An allocated page with the encrypted content on success. Else, an
* error value or NULL.
*/
struct page *ext4_encrypt(struct inode *inode,
struct page *plaintext_page,
gfp_t gfp_flags)
{
struct ext4_crypto_ctx *ctx;
struct page *ciphertext_page = NULL;
int err;
BUG_ON(!PageLocked(plaintext_page));
ctx = ext4_get_crypto_ctx(inode, gfp_flags);
if (IS_ERR(ctx))
return (struct page *) ctx;
/* The encryption operation will require a bounce page. */
ciphertext_page = alloc_bounce_page(ctx, gfp_flags);
if (IS_ERR(ciphertext_page))
goto errout;
ctx->w.control_page = plaintext_page;
err = ext4_page_crypto(inode, EXT4_ENCRYPT, plaintext_page->index,
plaintext_page, ciphertext_page, gfp_flags);
if (err) {
ciphertext_page = ERR_PTR(err);
errout:
ext4_release_crypto_ctx(ctx);
return ciphertext_page;
}
SetPagePrivate(ciphertext_page);
set_page_private(ciphertext_page, (unsigned long)ctx);
lock_page(ciphertext_page);
return ciphertext_page;
}
/**
* ext4_decrypt() - Decrypts a page in-place
* @ctx: The encryption context.
* @page: The page to decrypt. Must be locked.
*
* Decrypts page in-place using the ctx encryption context.
*
* Called from the read completion callback.
*
* Return: Zero on success, non-zero otherwise.
*/
int ext4_decrypt(struct page *page)
{
BUG_ON(!PageLocked(page));
return ext4_page_crypto(page->mapping->host, EXT4_DECRYPT,
page->index, page, page, GFP_NOFS);
}
int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
ext4_fsblk_t pblk, ext4_lblk_t len)
{
struct ext4_crypto_ctx *ctx;
struct page *ciphertext_page = NULL;
struct bio *bio;
int ret, err = 0;
#if 0
ext4_msg(inode->i_sb, KERN_CRIT,
"ext4_encrypted_zeroout ino %lu lblk %u len %u",
(unsigned long) inode->i_ino, lblk, len);
#endif
BUG_ON(inode->i_sb->s_blocksize != PAGE_SIZE);
ctx = ext4_get_crypto_ctx(inode, GFP_NOFS);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
ciphertext_page = alloc_bounce_page(ctx, GFP_NOWAIT);
if (IS_ERR(ciphertext_page)) {
err = PTR_ERR(ciphertext_page);
goto errout;
}
while (len--) {
err = ext4_page_crypto(inode, EXT4_ENCRYPT, lblk,
ZERO_PAGE(0), ciphertext_page,
GFP_NOFS);
if (err)
goto errout;
bio = bio_alloc(GFP_NOWAIT, 1);
if (!bio) {
err = -ENOMEM;
goto errout;
}
bio->bi_bdev = inode->i_sb->s_bdev;
bio->bi_iter.bi_sector =
pblk << (inode->i_sb->s_blocksize_bits - 9);
ret = bio_add_page(bio, ciphertext_page,
inode->i_sb->s_blocksize, 0);
if (ret != inode->i_sb->s_blocksize) {
/* should never happen! */
ext4_msg(inode->i_sb, KERN_ERR,
"bio_add_page failed: %d", ret);
WARN_ON(1);
bio_put(bio);
err = -EIO;
goto errout;
}
err = submit_bio_wait(WRITE, bio);
if ((err == 0) && bio->bi_error)
err = -EIO;
bio_put(bio);
if (err)
goto errout;
lblk++; pblk++;
}
err = 0;
errout:
ext4_release_crypto_ctx(ctx);
return err;
}
bool ext4_valid_contents_enc_mode(uint32_t mode)
{
return (mode == EXT4_ENCRYPTION_MODE_AES_256_XTS);
}
/**
* ext4_validate_encryption_key_size() - Validate the encryption key size
* @mode: The key mode.
* @size: The key size to validate.
*
* Return: The validated key size for @mode. Zero if invalid.
*/
uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size)
{
if (size == ext4_encryption_key_size(mode))
return size;
return 0;
}
/*
* Validate dentries for encrypted directories to make sure we aren't
* potentially caching stale data after a key has been added or
* removed.
*/
static int ext4_d_revalidate(struct dentry *dentry, unsigned int flags)
{
struct dentry *dir;
struct ext4_crypt_info *ci;
int dir_has_key, cached_with_key;
if (flags & LOOKUP_RCU)
return -ECHILD;
dir = dget_parent(dentry);
if (!ext4_encrypted_inode(d_inode(dir))) {
dput(dir);
return 0;
}
ci = EXT4_I(d_inode(dir))->i_crypt_info;
if (ci && ci->ci_keyring_key &&
(ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
(1 << KEY_FLAG_REVOKED) |
(1 << KEY_FLAG_DEAD))))
ci = NULL;
/* this should eventually be an flag in d_flags */
cached_with_key = dentry->d_fsdata != NULL;
dir_has_key = (ci != NULL);
dput(dir);
/*
* If the dentry was cached without the key, and it is a
* negative dentry, it might be a valid name. We can't check
* if the key has since been made available due to locking
* reasons, so we fail the validation so ext4_lookup() can do
* this check.
*
* We also fail the validation if the dentry was created with
* the key present, but we no longer have the key, or vice versa.
*/
if ((!cached_with_key && d_is_negative(dentry)) ||
(!cached_with_key && dir_has_key) ||
(cached_with_key && !dir_has_key)) {
#if 0 /* Revalidation debug */
char buf[80];
char *cp = simple_dname(dentry, buf, sizeof(buf));
if (IS_ERR(cp))
cp = (char *) "???";
pr_err("revalidate: %s %p %d %d %d\n", cp, dentry->d_fsdata,
cached_with_key, d_is_negative(dentry),
dir_has_key);
#endif
return 0;
}
return 1;
}
const struct dentry_operations ext4_encrypted_d_ops = {
.d_revalidate = ext4_d_revalidate,
};

468
fs/ext4/crypto_fname.c
Просмотреть файл

@ -1,468 +0,0 @@
/*
* linux/fs/ext4/crypto_fname.c
*
* Copyright (C) 2015, Google, Inc.
*
* This contains functions for filename crypto management in ext4
*
* Written by Uday Savagaonkar, 2014.
*
* This has not yet undergone a rigorous security audit.
*
*/
#include <crypto/skcipher.h>
#include <keys/encrypted-type.h>
#include <keys/user-type.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/key.h>
#include <linux/list.h>
#include <linux/mempool.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <linux/spinlock_types.h>
#include "ext4.h"
#include "ext4_crypto.h"
#include "xattr.h"
/**
* ext4_dir_crypt_complete() -
*/
static void ext4_dir_crypt_complete(struct crypto_async_request *req, int res)
{
struct ext4_completion_result *ecr = req->data;
if (res == -EINPROGRESS)
return;
ecr->res = res;
complete(&ecr->completion);
}
bool ext4_valid_filenames_enc_mode(uint32_t mode)
{
return (mode == EXT4_ENCRYPTION_MODE_AES_256_CTS);
}
static unsigned max_name_len(struct inode *inode)
{
return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
EXT4_NAME_LEN;
}
/**
* ext4_fname_encrypt() -
*
* This function encrypts the input filename, and returns the length of the
* ciphertext. Errors are returned as negative numbers. We trust the caller to
* allocate sufficient memory to oname string.
*/
static int ext4_fname_encrypt(struct inode *inode,
const struct qstr *iname,
struct ext4_str *oname)
{
u32 ciphertext_len;
struct skcipher_request *req = NULL;
DECLARE_EXT4_COMPLETION_RESULT(ecr);
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
struct crypto_skcipher *tfm = ci->ci_ctfm;
int res = 0;
char iv[EXT4_CRYPTO_BLOCK_SIZE];
struct scatterlist src_sg, dst_sg;
int padding = 4 << (ci->ci_flags & EXT4_POLICY_FLAGS_PAD_MASK);
char *workbuf, buf[32], *alloc_buf = NULL;
unsigned lim = max_name_len(inode);
if (iname->len <= 0 || iname->len > lim)
return -EIO;
ciphertext_len = (iname->len < EXT4_CRYPTO_BLOCK_SIZE) ?
EXT4_CRYPTO_BLOCK_SIZE : iname->len;
ciphertext_len = ext4_fname_crypto_round_up(ciphertext_len, padding);
ciphertext_len = (ciphertext_len > lim)
? lim : ciphertext_len;
if (ciphertext_len <= sizeof(buf)) {
workbuf = buf;
} else {
alloc_buf = kmalloc(ciphertext_len, GFP_NOFS);
if (!alloc_buf)
return -ENOMEM;
workbuf = alloc_buf;
}
/* Allocate request */
req = skcipher_request_alloc(tfm, GFP_NOFS);
if (!req) {
printk_ratelimited(
KERN_ERR "%s: crypto_request_alloc() failed\n", __func__);
kfree(alloc_buf);
return -ENOMEM;
}
skcipher_request_set_callback(req,
CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ext4_dir_crypt_complete, &ecr);
/* Copy the input */
memcpy(workbuf, iname->name, iname->len);
if (iname->len < ciphertext_len)
memset(workbuf + iname->len, 0, ciphertext_len - iname->len);
/* Initialize IV */
memset(iv, 0, EXT4_CRYPTO_BLOCK_SIZE);
/* Create encryption request */
sg_init_one(&src_sg, workbuf, ciphertext_len);
sg_init_one(&dst_sg, oname->name, ciphertext_len);
skcipher_request_set_crypt(req, &src_sg, &dst_sg, ciphertext_len, iv);
res = crypto_skcipher_encrypt(req);
if (res == -EINPROGRESS || res == -EBUSY) {
wait_for_completion(&ecr.completion);
res = ecr.res;
}
kfree(alloc_buf);
skcipher_request_free(req);
if (res < 0) {
printk_ratelimited(
KERN_ERR "%s: Error (error code %d)\n", __func__, res);
}
oname->len = ciphertext_len;
return res;
}
/*
* ext4_fname_decrypt()
* This function decrypts the input filename, and returns
* the length of the plaintext.
* Errors are returned as negative numbers.
* We trust the caller to allocate sufficient memory to oname string.
*/
static int ext4_fname_decrypt(struct inode *inode,
const struct ext4_str *iname,
struct ext4_str *oname)
{
struct ext4_str tmp_in[2], tmp_out[1];
struct skcipher_request *req = NULL;
DECLARE_EXT4_COMPLETION_RESULT(ecr);
struct scatterlist src_sg, dst_sg;
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
struct crypto_skcipher *tfm = ci->ci_ctfm;
int res = 0;
char iv[EXT4_CRYPTO_BLOCK_SIZE];
unsigned lim = max_name_len(inode);
if (iname->len <= 0 || iname->len > lim)
return -EIO;
tmp_in[0].name = iname->name;
tmp_in[0].len = iname->len;
tmp_out[0].name = oname->name;
/* Allocate request */
req = skcipher_request_alloc(tfm, GFP_NOFS);
if (!req) {
printk_ratelimited(
KERN_ERR "%s: crypto_request_alloc() failed\n", __func__);
return -ENOMEM;
}
skcipher_request_set_callback(req,
CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
ext4_dir_crypt_complete, &ecr);
/* Initialize IV */
memset(iv, 0, EXT4_CRYPTO_BLOCK_SIZE);
/* Create encryption request */
sg_init_one(&src_sg, iname->name, iname->len);
sg_init_one(&dst_sg, oname->name, oname->len);
skcipher_request_set_crypt(req, &src_sg, &dst_sg, iname->len, iv);
res = crypto_skcipher_decrypt(req);
if (res == -EINPROGRESS || res == -EBUSY) {
wait_for_completion(&ecr.completion);
res = ecr.res;
}
skcipher_request_free(req);
if (res < 0) {
printk_ratelimited(
KERN_ERR "%s: Error in ext4_fname_encrypt (error code %d)\n",
__func__, res);
return res;
}
oname->len = strnlen(oname->name, iname->len);
return oname->len;
}
static const char *lookup_table =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
/**
* ext4_fname_encode_digest() -
*
* Encodes the input digest using characters from the set [a-zA-Z0-9_+].
* The encoded string is roughly 4/3 times the size of the input string.
*/
static int digest_encode(const char *src, int len, char *dst)
{
int i = 0, bits = 0, ac = 0;
char *cp = dst;
while (i < len) {
ac += (((unsigned char) src[i]) << bits);
bits += 8;
do {
*cp++ = lookup_table[ac & 0x3f];
ac >>= 6;
bits -= 6;
} while (bits >= 6);
i++;
}
if (bits)
*cp++ = lookup_table[ac & 0x3f];
return cp - dst;
}
static int digest_decode(const char *src, int len, char *dst)
{
int i = 0, bits = 0, ac = 0;
const char *p;
char *cp = dst;
while (i < len) {
p = strchr(lookup_table, src[i]);
if (p == NULL || src[i] == 0)
return -2;
ac += (p - lookup_table) << bits;
bits += 6;
if (bits >= 8) {
*cp++ = ac & 0xff;
ac >>= 8;
bits -= 8;
}
i++;
}
if (ac)
return -1;
return cp - dst;
}
/**
* ext4_fname_crypto_round_up() -
*
* Return: The next multiple of block size
*/
u32 ext4_fname_crypto_round_up(u32 size, u32 blksize)
{
return ((size+blksize-1)/blksize)*blksize;
}
unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen)
{
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
int padding = 32;
if (ci)
padding = 4 << (ci->ci_flags & EXT4_POLICY_FLAGS_PAD_MASK);
if (ilen < EXT4_CRYPTO_BLOCK_SIZE)
ilen = EXT4_CRYPTO_BLOCK_SIZE;
return ext4_fname_crypto_round_up(ilen, padding);
}
/*
* ext4_fname_crypto_alloc_buffer() -
*
* Allocates an output buffer that is sufficient for the crypto operation
* specified by the context and the direction.
*/
int ext4_fname_crypto_alloc_buffer(struct inode *inode,
u32 ilen, struct ext4_str *crypto_str)
{
unsigned int olen = ext4_fname_encrypted_size(inode, ilen);
crypto_str->len = olen;
if (olen < EXT4_FNAME_CRYPTO_DIGEST_SIZE*2)
olen = EXT4_FNAME_CRYPTO_DIGEST_SIZE*2;
/* Allocated buffer can hold one more character to null-terminate the
* string */
crypto_str->name = kmalloc(olen+1, GFP_NOFS);
if (!(crypto_str->name))
return -ENOMEM;
return 0;
}
/**
* ext4_fname_crypto_free_buffer() -
*
* Frees the buffer allocated for crypto operation.
*/
void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str)
{
if (!crypto_str)
return;
kfree(crypto_str->name);
crypto_str->name = NULL;
}
/**
* ext4_fname_disk_to_usr() - converts a filename from disk space to user space
*/
int _ext4_fname_disk_to_usr(struct inode *inode,
struct dx_hash_info *hinfo,
const struct ext4_str *iname,
struct ext4_str *oname)
{
char buf[24];
int ret;
if (iname->len < 3) {
/*Check for . and .. */
if (iname->name[0] == '.' && iname->name[iname->len-1] == '.') {
oname->name[0] = '.';
oname->name[iname->len-1] = '.';
oname->len = iname->len;
return oname->len;
}
}
if (iname->len < EXT4_CRYPTO_BLOCK_SIZE) {
EXT4_ERROR_INODE(inode, "encrypted inode too small");
return -EUCLEAN;
}
if (EXT4_I(inode)->i_crypt_info)
return ext4_fname_decrypt(inode, iname, oname);
if (iname->len <= EXT4_FNAME_CRYPTO_DIGEST_SIZE) {
ret = digest_encode(iname->name, iname->len, oname->name);
oname->len = ret;
return ret;
}
if (hinfo) {
memcpy(buf, &hinfo->hash, 4);
memcpy(buf+4, &hinfo->minor_hash, 4);
} else
memset(buf, 0, 8);
memcpy(buf + 8, iname->name + iname->len - 16, 16);
oname->name[0] = '_';
ret = digest_encode(buf, 24, oname->name+1);
oname->len = ret + 1;
return ret + 1;
}
int ext4_fname_disk_to_usr(struct inode *inode,
struct dx_hash_info *hinfo,
const struct ext4_dir_entry_2 *de,
struct ext4_str *oname)
{
struct ext4_str iname = {.name = (unsigned char *) de->name,
.len = de->name_len };
return _ext4_fname_disk_to_usr(inode, hinfo, &iname, oname);
}
/**
* ext4_fname_usr_to_disk() - converts a filename from user space to disk space
*/
int ext4_fname_usr_to_disk(struct inode *inode,
const struct qstr *iname,
struct ext4_str *oname)
{
int res;
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
if (iname->len < 3) {
/*Check for . and .. */
if (iname->name[0] == '.' &&
iname->name[iname->len-1] == '.') {
oname->name[0] = '.';
oname->name[iname->len-1] = '.';
oname->len = iname->len;
return oname->len;
}
}
if (ci) {
res = ext4_fname_encrypt(inode, iname, oname);
return res;
}
/* Without a proper key, a user is not allowed to modify the filenames
* in a directory. Consequently, a user space name cannot be mapped to
* a disk-space name */
return -EACCES;
}
int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
int lookup, struct ext4_filename *fname)
{
struct ext4_crypt_info *ci;
int ret = 0, bigname = 0;
memset(fname, 0, sizeof(struct ext4_filename));
fname->usr_fname = iname;
if (!ext4_encrypted_inode(dir) ||
((iname->name[0] == '.') &&
((iname->len == 1) ||
((iname->name[1] == '.') && (iname->len == 2))))) {
fname->disk_name.name = (unsigned char *) iname->name;
fname->disk_name.len = iname->len;
return 0;
}
ret = ext4_get_encryption_info(dir);
if (ret)
return ret;
ci = EXT4_I(dir)->i_crypt_info;
if (ci) {
ret = ext4_fname_crypto_alloc_buffer(dir, iname->len,
&fname->crypto_buf);
if (ret < 0)
return ret;
ret = ext4_fname_encrypt(dir, iname, &fname->crypto_buf);
if (ret < 0)
goto errout;
fname->disk_name.name = fname->crypto_buf.name;
fname->disk_name.len = fname->crypto_buf.len;
return 0;
}
if (!lookup)
return -EACCES;
/* We don't have the key and we are doing a lookup; decode the
* user-supplied name
*/
if (iname->name[0] == '_')
bigname = 1;
if ((bigname && (iname->len != 33)) ||
(!bigname && (iname->len > 43)))
return -ENOENT;
fname->crypto_buf.name = kmalloc(32, GFP_KERNEL);
if (fname->crypto_buf.name == NULL)
return -ENOMEM;
ret = digest_decode(iname->name + bigname, iname->len - bigname,
fname->crypto_buf.name);
if (ret < 0) {
ret = -ENOENT;
goto errout;
}
fname->crypto_buf.len = ret;
if (bigname) {
memcpy(&fname->hinfo.hash, fname->crypto_buf.name, 4);
memcpy(&fname->hinfo.minor_hash, fname->crypto_buf.name + 4, 4);
} else {
fname->disk_name.name = fname->crypto_buf.name;
fname->disk_name.len = fname->crypto_buf.len;
}
return 0;
errout:
kfree(fname->crypto_buf.name);
fname->crypto_buf.name = NULL;
return ret;
}
void ext4_fname_free_filename(struct ext4_filename *fname)
{
kfree(fname->crypto_buf.name);
fname->crypto_buf.name = NULL;
fname->usr_fname = NULL;
fname->disk_name.name = NULL;
}

274
fs/ext4/crypto_key.c
Просмотреть файл

@ -1,274 +0,0 @@
/*
* linux/fs/ext4/crypto_key.c
*
* Copyright (C) 2015, Google, Inc.
*
* This contains encryption key functions for ext4
*
* Written by Michael Halcrow, Ildar Muslukhov, and Uday Savagaonkar, 2015.
*/
#include <crypto/skcipher.h>
#include <keys/encrypted-type.h>
#include <keys/user-type.h>
#include <linux/random.h>
#include <linux/scatterlist.h>
#include <uapi/linux/keyctl.h>
#include "ext4.h"
#include "xattr.h"
static void derive_crypt_complete(struct crypto_async_request *req, int rc)
{
struct ext4_completion_result *ecr = req->data;
if (rc == -EINPROGRESS)
return;
ecr->res = rc;
complete(&ecr->completion);
}
/**
* ext4_derive_key_aes() - Derive a key using AES-128-ECB
* @deriving_key: Encryption key used for derivation.
* @source_key: Source key to which to apply derivation.
* @derived_key: Derived key.
*
* Return: Zero on success; non-zero otherwise.
*/
static int ext4_derive_key_aes(char deriving_key[EXT4_AES_128_ECB_KEY_SIZE],
char source_key[EXT4_AES_256_XTS_KEY_SIZE],
char derived_key[EXT4_AES_256_XTS_KEY_SIZE])
{
int res = 0;
struct skcipher_request *req = NULL;
DECLARE_EXT4_COMPLETION_RESULT(ecr);
struct scatterlist src_sg, dst_sg;
struct crypto_skcipher *tfm = crypto_alloc_skcipher("ecb(aes)", 0, 0);
if (IS_ERR(tfm)) {
res = PTR_ERR(tfm);
tfm = NULL;
goto out;
}
crypto_skcipher_set_flags(tfm, CRYPTO_TFM_REQ_WEAK_KEY);
req = skcipher_request_alloc(tfm, GFP_NOFS);
if (!req) {
res = -ENOMEM;
goto out;
}
skcipher_request_set_callback(req,
CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
derive_crypt_complete, &ecr);
res = crypto_skcipher_setkey(tfm, deriving_key,
EXT4_AES_128_ECB_KEY_SIZE);
if (res < 0)
goto out;
sg_init_one(&src_sg, source_key, EXT4_AES_256_XTS_KEY_SIZE);
sg_init_one(&dst_sg, derived_key, EXT4_AES_256_XTS_KEY_SIZE);
skcipher_request_set_crypt(req, &src_sg, &dst_sg,
EXT4_AES_256_XTS_KEY_SIZE, NULL);
res = crypto_skcipher_encrypt(req);
if (res == -EINPROGRESS || res == -EBUSY) {
wait_for_completion(&ecr.completion);
res = ecr.res;
}
out:
skcipher_request_free(req);
crypto_free_skcipher(tfm);
return res;
}
void ext4_free_crypt_info(struct ext4_crypt_info *ci)
{
if (!ci)
return;
if (ci->ci_keyring_key)
key_put(ci->ci_keyring_key);
crypto_free_skcipher(ci->ci_ctfm);
kmem_cache_free(ext4_crypt_info_cachep, ci);
}
void ext4_free_encryption_info(struct inode *inode,
struct ext4_crypt_info *ci)
{
struct ext4_inode_info *ei = EXT4_I(inode);
struct ext4_crypt_info *prev;
if (ci == NULL)
ci = ACCESS_ONCE(ei->i_crypt_info);
if (ci == NULL)
return;
prev = cmpxchg(&ei->i_crypt_info, ci, NULL);
if (prev != ci)
return;
ext4_free_crypt_info(ci);
}
int _ext4_get_encryption_info(struct inode *inode)
{
struct ext4_inode_info *ei = EXT4_I(inode);
struct ext4_crypt_info *crypt_info;
char full_key_descriptor[EXT4_KEY_DESC_PREFIX_SIZE +
(EXT4_KEY_DESCRIPTOR_SIZE * 2) + 1];
struct key *keyring_key = NULL;
struct ext4_encryption_key *master_key;
struct ext4_encryption_context ctx;
const struct user_key_payload *ukp;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct crypto_skcipher *ctfm;
const char *cipher_str;
char raw_key[EXT4_MAX_KEY_SIZE];
char mode;
int res;
if (!ext4_read_workqueue) {
res = ext4_init_crypto();
if (res)
return res;
}
retry:
crypt_info = ACCESS_ONCE(ei->i_crypt_info);
if (crypt_info) {
if (!crypt_info->ci_keyring_key ||
key_validate(crypt_info->ci_keyring_key) == 0)
return 0;
ext4_free_encryption_info(inode, crypt_info);
goto retry;
}
res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
&ctx, sizeof(ctx));
if (res < 0) {
if (!DUMMY_ENCRYPTION_ENABLED(sbi))
return res;
ctx.contents_encryption_mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
ctx.filenames_encryption_mode =
EXT4_ENCRYPTION_MODE_AES_256_CTS;
ctx.flags = 0;
} else if (res != sizeof(ctx))
return -EINVAL;
res = 0;
crypt_info = kmem_cache_alloc(ext4_crypt_info_cachep, GFP_KERNEL);
if (!crypt_info)
return -ENOMEM;
crypt_info->ci_flags = ctx.flags;
crypt_info->ci_data_mode = ctx.contents_encryption_mode;
crypt_info->ci_filename_mode = ctx.filenames_encryption_mode;
crypt_info->ci_ctfm = NULL;
crypt_info->ci_keyring_key = NULL;
memcpy(crypt_info->ci_master_key, ctx.master_key_descriptor,
sizeof(crypt_info->ci_master_key));
if (S_ISREG(inode->i_mode))
mode = crypt_info->ci_data_mode;
else if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
mode = crypt_info->ci_filename_mode;
else
BUG();
switch (mode) {
case EXT4_ENCRYPTION_MODE_AES_256_XTS:
cipher_str = "xts(aes)";
break;
case EXT4_ENCRYPTION_MODE_AES_256_CTS:
cipher_str = "cts(cbc(aes))";
break;
default:
printk_once(KERN_WARNING
"ext4: unsupported key mode %d (ino %u)\n",
mode, (unsigned) inode->i_ino);
res = -ENOKEY;
goto out;
}
if (DUMMY_ENCRYPTION_ENABLED(sbi)) {
memset(raw_key, 0x42, EXT4_AES_256_XTS_KEY_SIZE);
goto got_key;
}
memcpy(full_key_descriptor, EXT4_KEY_DESC_PREFIX,
EXT4_KEY_DESC_PREFIX_SIZE);
sprintf(full_key_descriptor + EXT4_KEY_DESC_PREFIX_SIZE,
"%*phN", EXT4_KEY_DESCRIPTOR_SIZE,
ctx.master_key_descriptor);
full_key_descriptor[EXT4_KEY_DESC_PREFIX_SIZE +
(2 * EXT4_KEY_DESCRIPTOR_SIZE)] = '\0';
keyring_key = request_key(&key_type_logon, full_key_descriptor, NULL);
if (IS_ERR(keyring_key)) {
res = PTR_ERR(keyring_key);
keyring_key = NULL;
goto out;
}
crypt_info->ci_keyring_key = keyring_key;
if (keyring_key->type != &key_type_logon) {
printk_once(KERN_WARNING
"ext4: key type must be logon\n");
res = -ENOKEY;
goto out;
}
down_read(&keyring_key->sem);
ukp = user_key_payload(keyring_key);
if (ukp->datalen != sizeof(struct ext4_encryption_key)) {
res = -EINVAL;
up_read(&keyring_key->sem);
goto out;
}
master_key = (struct ext4_encryption_key *)ukp->data;
BUILD_BUG_ON(EXT4_AES_128_ECB_KEY_SIZE !=
EXT4_KEY_DERIVATION_NONCE_SIZE);
if (master_key->size != EXT4_AES_256_XTS_KEY_SIZE) {
printk_once(KERN_WARNING
"ext4: key size incorrect: %d\n",
master_key->size);
res = -ENOKEY;
up_read(&keyring_key->sem);
goto out;
}
res = ext4_derive_key_aes(ctx.nonce, master_key->raw,
raw_key);
up_read(&keyring_key->sem);
if (res)
goto out;
got_key:
ctfm = crypto_alloc_skcipher(cipher_str, 0, 0);
if (!ctfm || IS_ERR(ctfm)) {
res = ctfm ? PTR_ERR(ctfm) : -ENOMEM;
printk(KERN_DEBUG
"%s: error %d (inode %u) allocating crypto tfm\n",
__func__, res, (unsigned) inode->i_ino);
goto out;
}
crypt_info->ci_ctfm = ctfm;
crypto_skcipher_clear_flags(ctfm, ~0);
crypto_tfm_set_flags(crypto_skcipher_tfm(ctfm),
CRYPTO_TFM_REQ_WEAK_KEY);
res = crypto_skcipher_setkey(ctfm, raw_key,
ext4_encryption_key_size(mode));
if (res)
goto out;
memzero_explicit(raw_key, sizeof(raw_key));
if (cmpxchg(&ei->i_crypt_info, NULL, crypt_info) != NULL) {
ext4_free_crypt_info(crypt_info);
goto retry;
}
return 0;
out:
if (res == -ENOKEY)
res = 0;
ext4_free_crypt_info(crypt_info);
memzero_explicit(raw_key, sizeof(raw_key));
return res;
}
int ext4_has_encryption_key(struct inode *inode)
{
struct ext4_inode_info *ei = EXT4_I(inode);
return (ei->i_crypt_info != NULL);
}

229
fs/ext4/crypto_policy.c
Просмотреть файл

@ -1,229 +0,0 @@
/*
* linux/fs/ext4/crypto_policy.c
*
* Copyright (C) 2015, Google, Inc.
*
* This contains encryption policy functions for ext4
*
* Written by Michael Halcrow, 2015.
*/
#include <linux/random.h>
#include <linux/string.h>
#include <linux/types.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include "xattr.h"
static int ext4_inode_has_encryption_context(struct inode *inode)
{
int res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, NULL, 0);
return (res > 0);
}
/*
* check whether the policy is consistent with the encryption context
* for the inode
*/
static int ext4_is_encryption_context_consistent_with_policy(
struct inode *inode, const struct ext4_encryption_policy *policy)
{
struct ext4_encryption_context ctx;
int res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, &ctx,
sizeof(ctx));
if (res != sizeof(ctx))
return 0;
return (memcmp(ctx.master_key_descriptor, policy->master_key_descriptor,
EXT4_KEY_DESCRIPTOR_SIZE) == 0 &&
(ctx.flags ==
policy->flags) &&
(ctx.contents_encryption_mode ==
policy->contents_encryption_mode) &&
(ctx.filenames_encryption_mode ==
policy->filenames_encryption_mode));
}
static int ext4_create_encryption_context_from_policy(
struct inode *inode, const struct ext4_encryption_policy *policy)
{
struct ext4_encryption_context ctx;
handle_t *handle;
int res, res2;
res = ext4_convert_inline_data(inode);
if (res)
return res;
ctx.format = EXT4_ENCRYPTION_CONTEXT_FORMAT_V1;
memcpy(ctx.master_key_descriptor, policy->master_key_descriptor,
EXT4_KEY_DESCRIPTOR_SIZE);
if (!ext4_valid_contents_enc_mode(policy->contents_encryption_mode)) {
printk(KERN_WARNING
"%s: Invalid contents encryption mode %d\n", __func__,
policy->contents_encryption_mode);
return -EINVAL;
}
if (!ext4_valid_filenames_enc_mode(policy->filenames_encryption_mode)) {
printk(KERN_WARNING
"%s: Invalid filenames encryption mode %d\n", __func__,
policy->filenames_encryption_mode);
return -EINVAL;
}
if (policy->flags & ~EXT4_POLICY_FLAGS_VALID)
return -EINVAL;
ctx.contents_encryption_mode = policy->contents_encryption_mode;
ctx.filenames_encryption_mode = policy->filenames_encryption_mode;
ctx.flags = policy->flags;
BUILD_BUG_ON(sizeof(ctx.nonce) != EXT4_KEY_DERIVATION_NONCE_SIZE);
get_random_bytes(ctx.nonce, EXT4_KEY_DERIVATION_NONCE_SIZE);
handle = ext4_journal_start(inode, EXT4_HT_MISC,
ext4_jbd2_credits_xattr(inode));
if (IS_ERR(handle))
return PTR_ERR(handle);
res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, &ctx,
sizeof(ctx), 0);
if (!res) {
ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
res = ext4_mark_inode_dirty(handle, inode);
if (res)
EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
}
res2 = ext4_journal_stop(handle);
if (!res)
res = res2;
return res;
}
int ext4_process_policy(const struct ext4_encryption_policy *policy,
struct inode *inode)
{
if (policy->version != 0)
return -EINVAL;
if (!ext4_inode_has_encryption_context(inode)) {
if (!S_ISDIR(inode->i_mode))
return -EINVAL;
if (!ext4_empty_dir(inode))
return -ENOTEMPTY;
return ext4_create_encryption_context_from_policy(inode,
policy);
}
if (ext4_is_encryption_context_consistent_with_policy(inode, policy))
return 0;
printk(KERN_WARNING "%s: Policy inconsistent with encryption context\n",
__func__);
return -EINVAL;
}
int ext4_get_policy(struct inode *inode, struct ext4_encryption_policy *policy)
{
struct ext4_encryption_context ctx;
int res = ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
&ctx, sizeof(ctx));
if (res != sizeof(ctx))
return -ENOENT;
if (ctx.format != EXT4_ENCRYPTION_CONTEXT_FORMAT_V1)
return -EINVAL;
policy->version = 0;
policy->contents_encryption_mode = ctx.contents_encryption_mode;
policy->filenames_encryption_mode = ctx.filenames_encryption_mode;
policy->flags = ctx.flags;
memcpy(&policy->master_key_descriptor, ctx.master_key_descriptor,
EXT4_KEY_DESCRIPTOR_SIZE);
return 0;
}
int ext4_is_child_context_consistent_with_parent(struct inode *parent,
struct inode *child)
{
struct ext4_crypt_info *parent_ci, *child_ci;
int res;
if ((parent == NULL) || (child == NULL)) {
pr_err("parent %p child %p\n", parent, child);
WARN_ON(1); /* Should never happen */
return 0;
}
/* no restrictions if the parent directory is not encrypted */
if (!ext4_encrypted_inode(parent))
return 1;
/* if the child directory is not encrypted, this is always a problem */
if (!ext4_encrypted_inode(child))
return 0;
res = ext4_get_encryption_info(parent);
if (res)
return 0;
res = ext4_get_encryption_info(child);
if (res)
return 0;
parent_ci = EXT4_I(parent)->i_crypt_info;
child_ci = EXT4_I(child)->i_crypt_info;
if (!parent_ci && !child_ci)
return 1;
if (!parent_ci || !child_ci)
return 0;
return (memcmp(parent_ci->ci_master_key,
child_ci->ci_master_key,
EXT4_KEY_DESCRIPTOR_SIZE) == 0 &&
(parent_ci->ci_data_mode == child_ci->ci_data_mode) &&
(parent_ci->ci_filename_mode == child_ci->ci_filename_mode) &&
(parent_ci->ci_flags == child_ci->ci_flags));
}
/**
* ext4_inherit_context() - Sets a child context from its parent
* @parent: Parent inode from which the context is inherited.
* @child: Child inode that inherits the context from @parent.
*
* Return: Zero on success, non-zero otherwise
*/
int ext4_inherit_context(struct inode *parent, struct inode *child)
{
struct ext4_encryption_context ctx;
struct ext4_crypt_info *ci;
int res;
res = ext4_get_encryption_info(parent);
if (res < 0)
return res;
ci = EXT4_I(parent)->i_crypt_info;
if (ci == NULL)
return -ENOKEY;
ctx.format = EXT4_ENCRYPTION_CONTEXT_FORMAT_V1;
if (DUMMY_ENCRYPTION_ENABLED(EXT4_SB(parent->i_sb))) {
ctx.contents_encryption_mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
ctx.filenames_encryption_mode =
EXT4_ENCRYPTION_MODE_AES_256_CTS;
ctx.flags = 0;
memset(ctx.master_key_descriptor, 0x42,
EXT4_KEY_DESCRIPTOR_SIZE);
res = 0;
} else {
ctx.contents_encryption_mode = ci->ci_data_mode;
ctx.filenames_encryption_mode = ci->ci_filename_mode;
ctx.flags = ci->ci_flags;
memcpy(ctx.master_key_descriptor, ci->ci_master_key,
EXT4_KEY_DESCRIPTOR_SIZE);
}
get_random_bytes(ctx.nonce, EXT4_KEY_DERIVATION_NONCE_SIZE);
res = ext4_xattr_set(child, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, &ctx,
sizeof(ctx), 0);
if (!res) {
ext4_set_inode_flag(child, EXT4_INODE_ENCRYPT);
ext4_clear_inode_state(child, EXT4_STATE_MAY_INLINE_DATA);
res = ext4_get_encryption_info(child);
}
return res;
}

26
fs/ext4/dir.c
Просмотреть файл

@ -109,10 +109,10 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
struct super_block *sb = inode->i_sb;
struct buffer_head *bh = NULL;
int dir_has_error = 0;
struct ext4_str fname_crypto_str = {.name = NULL, .len = 0};
struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
if (ext4_encrypted_inode(inode)) {
err = ext4_get_encryption_info(inode);
err = fscrypt_get_encryption_info(inode);
if (err && err != -ENOKEY)
return err;
}
@ -139,8 +139,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
}
if (ext4_encrypted_inode(inode)) {
err = ext4_fname_crypto_alloc_buffer(inode, EXT4_NAME_LEN,
&fname_crypto_str);
err = fscrypt_fname_alloc_buffer(inode, EXT4_NAME_LEN, &fstr);
if (err < 0)
return err;
}
@ -253,16 +252,19 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
get_dtype(sb, de->file_type)))
goto done;
} else {
int save_len = fname_crypto_str.len;
int save_len = fstr.len;
struct fscrypt_str de_name =
FSTR_INIT(de->name,
de->name_len);
/* Directory is encrypted */
err = ext4_fname_disk_to_usr(inode,
NULL, de, &fname_crypto_str);
fname_crypto_str.len = save_len;
err = fscrypt_fname_disk_to_usr(inode,
0, 0, &de_name, &fstr);
fstr.len = save_len;
if (err < 0)
goto errout;
if (!dir_emit(ctx,
fname_crypto_str.name, err,
fstr.name, err,
le32_to_cpu(de->inode),
get_dtype(sb, de->file_type)))
goto done;
@ -281,7 +283,7 @@ done:
err = 0;
errout:
#ifdef CONFIG_EXT4_FS_ENCRYPTION
ext4_fname_crypto_free_buffer(&fname_crypto_str);
fscrypt_fname_free_buffer(&fstr);
#endif
brelse(bh);
return err;
@ -432,7 +434,7 @@ void ext4_htree_free_dir_info(struct dir_private_info *p)
int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
__u32 minor_hash,
struct ext4_dir_entry_2 *dirent,
struct ext4_str *ent_name)
struct fscrypt_str *ent_name)
{
struct rb_node **p, *parent = NULL;
struct fname *fname, *new_fn;
@ -609,7 +611,7 @@ finished:
static int ext4_dir_open(struct inode * inode, struct file * filp)
{
if (ext4_encrypted_inode(inode))
return ext4_get_encryption_info(inode) ? -EACCES : 0;
return fscrypt_get_encryption_info(inode) ? -EACCES : 0;
return 0;
}

220
fs/ext4/ext4.h
Просмотреть файл

@ -32,6 +32,7 @@
#include <linux/percpu_counter.h>
#include <linux/ratelimit.h>
#include <crypto/hash.h>
#include <linux/fscrypto.h>
#include <linux/falloc.h>
#include <linux/percpu-rwsem.h>
#ifdef __KERNEL__
@ -608,15 +609,6 @@ enum {
#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
/* Encryption algorithms */
#define EXT4_ENCRYPTION_MODE_INVALID 0
#define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
#define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
#define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
#define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
#include "ext4_crypto.h"
/*
* ioctl commands
*/
@ -638,9 +630,9 @@ enum {
#define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
#define EXT4_IOC_SWAP_BOOT _IO('f', 17)
#define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
#define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy)
#define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
#define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)
#define EXT4_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
#define EXT4_IOC_GET_ENCRYPTION_PWSALT FS_IOC_GET_ENCRYPTION_PWSALT
#define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
#ifndef FS_IOC_FSGETXATTR
/* Until the uapi changes get merged for project quota... */
@ -1082,10 +1074,6 @@ struct ext4_inode_info {
/* Precomputed uuid+inum+igen checksum for seeding inode checksums */
__u32 i_csum_seed;
#ifdef CONFIG_EXT4_FS_ENCRYPTION
/* Encryption params */
struct ext4_crypt_info *i_crypt_info;
#endif
kprojid_t i_projid;
};
@ -1344,6 +1332,11 @@ struct ext4_super_block {
/* Number of quota types we support */
#define EXT4_MAXQUOTAS 3
#ifdef CONFIG_EXT4_FS_ENCRYPTION
#define EXT4_KEY_DESC_PREFIX "ext4:"
#define EXT4_KEY_DESC_PREFIX_SIZE 5
#endif
/*
* fourth extended-fs super-block data in memory
*/
@ -1513,6 +1506,12 @@ struct ext4_sb_info {
/* Barrier between changing inodes' journal flags and writepages ops. */
struct percpu_rw_semaphore s_journal_flag_rwsem;
/* Encryption support */
#ifdef CONFIG_EXT4_FS_ENCRYPTION
u8 key_prefix[EXT4_KEY_DESC_PREFIX_SIZE];
u8 key_prefix_size;
#endif
};
static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
@ -1611,15 +1610,6 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
/*
* Returns true if the inode is inode is encrypted
*/
static inline int ext4_encrypted_inode(struct inode *inode)
{
#ifdef CONFIG_EXT4_FS_ENCRYPTION
return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
#else
return 0;
#endif
}
#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
/*
@ -2083,10 +2073,10 @@ struct dx_hash_info
struct ext4_filename {
const struct qstr *usr_fname;
struct ext4_str disk_name;
struct fscrypt_str disk_name;
struct dx_hash_info hinfo;
#ifdef CONFIG_EXT4_FS_ENCRYPTION
struct ext4_str crypto_buf;
struct fscrypt_str crypto_buf;
#endif
};
@ -2297,81 +2287,51 @@ extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
struct ext4_group_desc *gdp);
ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
/* crypto_policy.c */
int ext4_is_child_context_consistent_with_parent(struct inode *parent,
struct inode *child);
int ext4_inherit_context(struct inode *parent, struct inode *child);
void ext4_to_hex(char *dst, char *src, size_t src_size);
int ext4_process_policy(const struct ext4_encryption_policy *policy,
struct inode *inode);
int ext4_get_policy(struct inode *inode,
struct ext4_encryption_policy *policy);
/* crypto.c */
extern struct kmem_cache *ext4_crypt_info_cachep;
bool ext4_valid_contents_enc_mode(uint32_t mode);
uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
extern struct workqueue_struct *ext4_read_workqueue;
struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode,
gfp_t gfp_flags);
void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
void ext4_restore_control_page(struct page *data_page);
struct page *ext4_encrypt(struct inode *inode,
struct page *plaintext_page,
gfp_t gfp_flags);
int ext4_decrypt(struct page *page);
int ext4_encrypted_zeroout(struct inode *inode, ext4_lblk_t lblk,
ext4_fsblk_t pblk, ext4_lblk_t len);
extern const struct dentry_operations ext4_encrypted_d_ops;
#ifdef CONFIG_EXT4_FS_ENCRYPTION
int ext4_init_crypto(void);
void ext4_exit_crypto(void);
static inline int ext4_sb_has_crypto(struct super_block *sb)
{
return ext4_has_feature_encrypt(sb);
}
#else
static inline int ext4_init_crypto(void) { return 0; }
static inline void ext4_exit_crypto(void) { }
static inline int ext4_sb_has_crypto(struct super_block *sb)
{
return 0;
}
#endif
/* crypto_fname.c */
bool ext4_valid_filenames_enc_mode(uint32_t mode);
u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
int ext4_fname_crypto_alloc_buffer(struct inode *inode,
u32 ilen, struct ext4_str *crypto_str);
int _ext4_fname_disk_to_usr(struct inode *inode,
struct dx_hash_info *hinfo,
const struct ext4_str *iname,
struct ext4_str *oname);
int ext4_fname_disk_to_usr(struct inode *inode,
struct dx_hash_info *hinfo,
const struct ext4_dir_entry_2 *de,
struct ext4_str *oname);
int ext4_fname_usr_to_disk(struct inode *inode,
const struct qstr *iname,
struct ext4_str *oname);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
int lookup, struct ext4_filename *fname);
void ext4_fname_free_filename(struct ext4_filename *fname);
#else
static inline
int ext4_setup_fname_crypto(struct inode *inode)
static inline bool ext4_encrypted_inode(struct inode *inode)
{
return 0;
return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
}
static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
#ifdef CONFIG_EXT4_FS_ENCRYPTION
static inline int ext4_fname_setup_filename(struct inode *dir,
const struct qstr *iname,
int lookup, struct ext4_filename *fname)
const struct qstr *iname,
int lookup, struct ext4_filename *fname)
{
struct fscrypt_name name;
int err;
memset(fname, 0, sizeof(struct ext4_filename));
err = fscrypt_setup_filename(dir, iname, lookup, &name);
fname->usr_fname = name.usr_fname;
fname->disk_name = name.disk_name;
fname->hinfo.hash = name.hash;
fname->hinfo.minor_hash = name.minor_hash;
fname->crypto_buf = name.crypto_buf;
return err;
}
static inline void ext4_fname_free_filename(struct ext4_filename *fname)
{
struct fscrypt_name name;
name.crypto_buf = fname->crypto_buf;
fscrypt_free_filename(&name);
fname->crypto_buf.name = NULL;
fname->usr_fname = NULL;
fname->disk_name.name = NULL;
}
#else
static inline int ext4_fname_setup_filename(struct inode *dir,
const struct qstr *iname,
int lookup, struct ext4_filename *fname)
{
fname->usr_fname = iname;
fname->disk_name.name = (unsigned char *) iname->name;
@ -2379,51 +2339,31 @@ static inline int ext4_fname_setup_filename(struct inode *dir,
return 0;
}
static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
#define fscrypt_set_d_op(i)
#define fscrypt_get_ctx fscrypt_notsupp_get_ctx
#define fscrypt_release_ctx fscrypt_notsupp_release_ctx
#define fscrypt_encrypt_page fscrypt_notsupp_encrypt_page
#define fscrypt_decrypt_page fscrypt_notsupp_decrypt_page
#define fscrypt_decrypt_bio_pages fscrypt_notsupp_decrypt_bio_pages
#define fscrypt_pullback_bio_page fscrypt_notsupp_pullback_bio_page
#define fscrypt_restore_control_page fscrypt_notsupp_restore_control_page
#define fscrypt_zeroout_range fscrypt_notsupp_zeroout_range
#define fscrypt_process_policy fscrypt_notsupp_process_policy
#define fscrypt_get_policy fscrypt_notsupp_get_policy
#define fscrypt_has_permitted_context fscrypt_notsupp_has_permitted_context
#define fscrypt_inherit_context fscrypt_notsupp_inherit_context
#define fscrypt_get_encryption_info fscrypt_notsupp_get_encryption_info
#define fscrypt_put_encryption_info fscrypt_notsupp_put_encryption_info
#define fscrypt_setup_filename fscrypt_notsupp_setup_filename
#define fscrypt_free_filename fscrypt_notsupp_free_filename
#define fscrypt_fname_encrypted_size fscrypt_notsupp_fname_encrypted_size
#define fscrypt_fname_alloc_buffer fscrypt_notsupp_fname_alloc_buffer
#define fscrypt_fname_free_buffer fscrypt_notsupp_fname_free_buffer
#define fscrypt_fname_disk_to_usr fscrypt_notsupp_fname_disk_to_usr
#define fscrypt_fname_usr_to_disk fscrypt_notsupp_fname_usr_to_disk
#endif
/* crypto_key.c */
void ext4_free_crypt_info(struct ext4_crypt_info *ci);
void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
int _ext4_get_encryption_info(struct inode *inode);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
int ext4_has_encryption_key(struct inode *inode);
static inline int ext4_get_encryption_info(struct inode *inode)
{
struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
if (!ci ||
(ci->ci_keyring_key &&
(ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
(1 << KEY_FLAG_REVOKED) |
(1 << KEY_FLAG_DEAD)))))
return _ext4_get_encryption_info(inode);
return 0;
}
static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
{
return EXT4_I(inode)->i_crypt_info;
}
#else
static inline int ext4_has_encryption_key(struct inode *inode)
{
return 0;
}
static inline int ext4_get_encryption_info(struct inode *inode)
{
return 0;
}
static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
{
return NULL;
}
#endif
/* dir.c */
extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
struct file *,
@ -2436,7 +2376,7 @@ extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
__u32 minor_hash,
struct ext4_dir_entry_2 *dirent,
struct ext4_str *ent_name);
struct fscrypt_str *ent_name);
extern void ext4_htree_free_dir_info(struct dir_private_info *p);
extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
struct buffer_head *bh,
@ -2624,7 +2564,7 @@ extern int ext4_generic_delete_entry(handle_t *handle,
void *entry_buf,
int buf_size,
int csum_size);
extern int ext4_empty_dir(struct inode *inode);
extern bool ext4_empty_dir(struct inode *inode);
/* resize.c */
extern int ext4_group_add(struct super_block *sb,
@ -3106,7 +3046,7 @@ extern int ext4_delete_inline_entry(handle_t *handle,
struct ext4_dir_entry_2 *de_del,
struct buffer_head *bh,
int *has_inline_data);
extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
struct ext4_dir_entry_2 **parent_de,
int *retval);

159
fs/ext4/ext4_crypto.h
Просмотреть файл

@ -1,159 +0,0 @@
/*
* linux/fs/ext4/ext4_crypto.h
*
* Copyright (C) 2015, Google, Inc.
*
* This contains encryption header content for ext4
*
* Written by Michael Halcrow, 2015.
*/
#ifndef _EXT4_CRYPTO_H
#define _EXT4_CRYPTO_H
#include <linux/fs.h>
#define EXT4_KEY_DESCRIPTOR_SIZE 8
/* Policy provided via an ioctl on the topmost directory */
struct ext4_encryption_policy {
char version;
char contents_encryption_mode;
char filenames_encryption_mode;
char flags;
char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
} __attribute__((__packed__));
#define EXT4_ENCRYPTION_CONTEXT_FORMAT_V1 1
#define EXT4_KEY_DERIVATION_NONCE_SIZE 16
#define EXT4_POLICY_FLAGS_PAD_4 0x00
#define EXT4_POLICY_FLAGS_PAD_8 0x01
#define EXT4_POLICY_FLAGS_PAD_16 0x02
#define EXT4_POLICY_FLAGS_PAD_32 0x03
#define EXT4_POLICY_FLAGS_PAD_MASK 0x03
#define EXT4_POLICY_FLAGS_VALID 0x03
/**
* Encryption context for inode
*
* Protector format:
* 1 byte: Protector format (1 = this version)
* 1 byte: File contents encryption mode
* 1 byte: File names encryption mode
* 1 byte: Reserved
* 8 bytes: Master Key descriptor
* 16 bytes: Encryption Key derivation nonce
*/
struct ext4_encryption_context {
char format;
char contents_encryption_mode;
char filenames_encryption_mode;
char flags;
char master_key_descriptor[EXT4_KEY_DESCRIPTOR_SIZE];
char nonce[EXT4_KEY_DERIVATION_NONCE_SIZE];
} __attribute__((__packed__));
/* Encryption parameters */
#define EXT4_XTS_TWEAK_SIZE 16
#define EXT4_AES_128_ECB_KEY_SIZE 16
#define EXT4_AES_256_GCM_KEY_SIZE 32
#define EXT4_AES_256_CBC_KEY_SIZE 32
#define EXT4_AES_256_CTS_KEY_SIZE 32
#define EXT4_AES_256_XTS_KEY_SIZE 64
#define EXT4_MAX_KEY_SIZE 64
#define EXT4_KEY_DESC_PREFIX "ext4:"
#define EXT4_KEY_DESC_PREFIX_SIZE 5
/* This is passed in from userspace into the kernel keyring */
struct ext4_encryption_key {
__u32 mode;
char raw[EXT4_MAX_KEY_SIZE];
__u32 size;
} __attribute__((__packed__));
struct ext4_crypt_info {
char ci_data_mode;
char ci_filename_mode;
char ci_flags;
struct crypto_skcipher *ci_ctfm;
struct key *ci_keyring_key;
char ci_master_key[EXT4_KEY_DESCRIPTOR_SIZE];
};
#define EXT4_CTX_REQUIRES_FREE_ENCRYPT_FL 0x00000001
#define EXT4_WRITE_PATH_FL 0x00000002
struct ext4_crypto_ctx {
union {
struct {
struct page *bounce_page; /* Ciphertext page */
struct page *control_page; /* Original page */
} w;
struct {
struct bio *bio;
struct work_struct work;
} r;
struct list_head free_list; /* Free list */
};
char flags; /* Flags */
char mode; /* Encryption mode for tfm */
};
struct ext4_completion_result {
struct completion completion;
int res;
};
#define DECLARE_EXT4_COMPLETION_RESULT(ecr) \
struct ext4_completion_result ecr = { \
COMPLETION_INITIALIZER((ecr).completion), 0 }
static inline int ext4_encryption_key_size(int mode)
{
switch (mode) {
case EXT4_ENCRYPTION_MODE_AES_256_XTS:
return EXT4_AES_256_XTS_KEY_SIZE;
case EXT4_ENCRYPTION_MODE_AES_256_GCM:
return EXT4_AES_256_GCM_KEY_SIZE;
case EXT4_ENCRYPTION_MODE_AES_256_CBC:
return EXT4_AES_256_CBC_KEY_SIZE;
case EXT4_ENCRYPTION_MODE_AES_256_CTS:
return EXT4_AES_256_CTS_KEY_SIZE;
default:
BUG();
}
return 0;
}
#define EXT4_FNAME_NUM_SCATTER_ENTRIES 4
#define EXT4_CRYPTO_BLOCK_SIZE 16
#define EXT4_FNAME_CRYPTO_DIGEST_SIZE 32
struct ext4_str {
unsigned char *name;
u32 len;
};
/**
* For encrypted symlinks, the ciphertext length is stored at the beginning
* of the string in little-endian format.
*/
struct ext4_encrypted_symlink_data {
__le16 len;
char encrypted_path[1];
} __attribute__((__packed__));
/**
* This function is used to calculate the disk space required to
* store a filename of length l in encrypted symlink format.
*/
static inline u32 encrypted_symlink_data_len(u32 l)
{
if (l < EXT4_CRYPTO_BLOCK_SIZE)
l = EXT4_CRYPTO_BLOCK_SIZE;
return (l + sizeof(struct ext4_encrypted_symlink_data) - 1);
}
#endif /* _EXT4_CRYPTO_H */

10
fs/ext4/file.c
Просмотреть файл

@ -303,10 +303,10 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
struct inode *inode = file->f_mapping->host;
if (ext4_encrypted_inode(inode)) {
int err = ext4_get_encryption_info(inode);
int err = fscrypt_get_encryption_info(inode);
if (err)
return 0;
if (ext4_encryption_info(inode) == NULL)
if (!fscrypt_has_encryption_key(inode))
return -ENOKEY;
}
file_accessed(file);
@ -362,16 +362,16 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
}
}
if (ext4_encrypted_inode(inode)) {
ret = ext4_get_encryption_info(inode);
ret = fscrypt_get_encryption_info(inode);
if (ret)
return -EACCES;
if (ext4_encryption_info(inode) == NULL)
if (!fscrypt_has_encryption_key(inode))
return -ENOKEY;
}
dir = dget_parent(file_dentry(filp));
if (ext4_encrypted_inode(d_inode(dir)) &&
!ext4_is_child_context_consistent_with_parent(d_inode(dir), inode)) {
!fscrypt_has_permitted_context(d_inode(dir), inode)) {
ext4_warning(inode->i_sb,
"Inconsistent encryption contexts: %lu/%lu",
(unsigned long) d_inode(dir)->i_ino,

7
fs/ext4/ialloc.c
Просмотреть файл

@ -767,10 +767,10 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
if ((ext4_encrypted_inode(dir) ||
DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))) &&
(S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) {
err = ext4_get_encryption_info(dir);
err = fscrypt_get_encryption_info(dir);
if (err)
return ERR_PTR(err);
if (ext4_encryption_info(dir) == NULL)
if (!fscrypt_has_encryption_key(dir))
return ERR_PTR(-EPERM);
if (!handle)
nblocks += EXT4_DATA_TRANS_BLOCKS(dir->i_sb);
@ -1115,7 +1115,8 @@ got:
}
if (encrypt) {
err = ext4_inherit_context(dir, inode);
/* give pointer to avoid set_context with journal ops. */
err = fscrypt_inherit_context(dir, inode, &encrypt, true);
if (err)
goto fail_free_drop;
}

14
fs/ext4/inline.c
Просмотреть файл

@ -1326,7 +1326,7 @@ int htree_inlinedir_to_tree(struct file *dir_file,
struct ext4_iloc iloc;
void *dir_buf = NULL;
struct ext4_dir_entry_2 fake;
struct ext4_str tmp_str;
struct fscrypt_str tmp_str;
ret = ext4_get_inode_loc(inode, &iloc);
if (ret)
@ -1739,20 +1739,20 @@ ext4_get_inline_entry(struct inode *inode,
return (struct ext4_dir_entry_2 *)(inline_pos + offset);
}
int empty_inline_dir(struct inode *dir, int *has_inline_data)
bool empty_inline_dir(struct inode *dir, int *has_inline_data)
{
int err, inline_size;
struct ext4_iloc iloc;
void *inline_pos;
unsigned int offset;
struct ext4_dir_entry_2 *de;
int ret = 1;
bool ret = true;
err = ext4_get_inode_loc(dir, &iloc);
if (err) {
EXT4_ERROR_INODE(dir, "error %d getting inode %lu block",
err, dir->i_ino);
return 1;
return true;
}
down_read(&EXT4_I(dir)->xattr_sem);
@ -1766,7 +1766,7 @@ int empty_inline_dir(struct inode *dir, int *has_inline_data)
ext4_warning(dir->i_sb,
"bad inline directory (dir #%lu) - no `..'",
dir->i_ino);
ret = 1;
ret = true;
goto out;
}
@ -1784,11 +1784,11 @@ int empty_inline_dir(struct inode *dir, int *has_inline_data)
dir->i_ino, le32_to_cpu(de->inode),
le16_to_cpu(de->rec_len), de->name_len,
inline_size);
ret = 1;
ret = true;
goto out;
}
if (le32_to_cpu(de->inode)) {
ret = 0;
ret = false;
goto out;
}
offset += ext4_rec_len_from_disk(de->rec_len, inline_size);

8
fs/ext4/inode.c
Просмотреть файл

@ -392,7 +392,7 @@ int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk, ext4_fsblk_t pblk,
int ret;
if (ext4_encrypted_inode(inode))
return ext4_encrypted_zeroout(inode, lblk, pblk, len);
return fscrypt_zeroout_range(inode, lblk, pblk, len);
ret = sb_issue_zeroout(inode->i_sb, pblk, len, GFP_NOFS);
if (ret > 0)
@ -1158,7 +1158,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
if (unlikely(err))
page_zero_new_buffers(page, from, to);
else if (decrypt)
err = ext4_decrypt(page);
err = fscrypt_decrypt_page(page);
return err;
}
#endif
@ -3735,9 +3735,9 @@ static int __ext4_block_zero_page_range(handle_t *handle,
if (S_ISREG(inode->i_mode) &&
ext4_encrypted_inode(inode)) {
/* We expect the key to be set. */
BUG_ON(!ext4_has_encryption_key(inode));
BUG_ON(!fscrypt_has_encryption_key(inode));
BUG_ON(blocksize != PAGE_SIZE);
WARN_ON_ONCE(ext4_decrypt(page));
WARN_ON_ONCE(fscrypt_decrypt_page(page));
}
}
if (ext4_should_journal_data(inode)) {

20
fs/ext4/ioctl.c
Просмотреть файл

@ -770,19 +770,13 @@ resizefs_out:
return ext4_ext_precache(inode);
case EXT4_IOC_SET_ENCRYPTION_POLICY: {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
struct ext4_encryption_policy policy;
int err = 0;
struct fscrypt_policy policy;
if (copy_from_user(&policy,
(struct ext4_encryption_policy __user *)arg,
sizeof(policy))) {
err = -EFAULT;
goto encryption_policy_out;
}
err = ext4_process_policy(&policy, inode);
encryption_policy_out:
return err;
(struct fscrypt_policy __user *)arg,
sizeof(policy)))
return -EFAULT;
return fscrypt_process_policy(inode, &policy);
#else
return -EOPNOTSUPP;
#endif
@ -825,12 +819,12 @@ encryption_policy_out:
}
case EXT4_IOC_GET_ENCRYPTION_POLICY: {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
struct ext4_encryption_policy policy;
struct fscrypt_policy policy;
int err = 0;
if (!ext4_encrypted_inode(inode))
return -ENOENT;
err = ext4_get_policy(inode, &policy);
err = fscrypt_get_policy(inode, &policy);
if (err)
return err;
if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))

131
fs/ext4/namei.c
Просмотреть файл

@ -611,19 +611,19 @@ static struct stats dx_show_leaf(struct inode *dir,
#ifdef CONFIG_EXT4_FS_ENCRYPTION
int len;
char *name;
struct ext4_str fname_crypto_str
= {.name = NULL, .len = 0};
struct fscrypt_str fname_crypto_str =
FSTR_INIT(NULL, 0);
int res = 0;
name = de->name;
len = de->name_len;
if (ext4_encrypted_inode(inode))
res = ext4_get_encryption_info(dir);
if (ext4_encrypted_inode(dir))
res = fscrypt_get_encryption_info(dir);
if (res) {
printk(KERN_WARNING "Error setting up"
" fname crypto: %d\n", res);
}
if (ctx == NULL) {
if (!fscrypt_has_encryption_key(dir)) {
/* Directory is not encrypted */
ext4fs_dirhash(de->name,
de->name_len, &h);
@ -632,19 +632,21 @@ static struct stats dx_show_leaf(struct inode *dir,
(unsigned) ((char *) de
- base));
} else {
struct fscrypt_str de_name =
FSTR_INIT(name, len);
/* Directory is encrypted */
res = ext4_fname_crypto_alloc_buffer(
ctx, de->name_len,
res = fscrypt_fname_alloc_buffer(
dir, len,
&fname_crypto_str);
if (res < 0) {
if (res < 0)
printk(KERN_WARNING "Error "
"allocating crypto "
"buffer--skipping "
"crypto\n");
ctx = NULL;
}
res = ext4_fname_disk_to_usr(ctx, NULL, de,
&fname_crypto_str);
res = fscrypt_fname_disk_to_usr(dir,
0, 0, &de_name,
&fname_crypto_str);
if (res < 0) {
printk(KERN_WARNING "Error "
"converting filename "
@ -661,8 +663,8 @@ static struct stats dx_show_leaf(struct inode *dir,
printk("%*.s:(E)%x.%u ", len, name,
h.hash, (unsigned) ((char *) de
- base));
ext4_fname_crypto_free_buffer(
&fname_crypto_str);
fscrypt_fname_free_buffer(
&fname_crypto_str);
}
#else
int len = de->name_len;
@ -951,7 +953,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
struct buffer_head *bh;
struct ext4_dir_entry_2 *de, *top;
int err = 0, count = 0;
struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}, tmp_str;
struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
(unsigned long)block));
@ -966,12 +968,12 @@ static int htree_dirblock_to_tree(struct file *dir_file,
#ifdef CONFIG_EXT4_FS_ENCRYPTION
/* Check if the directory is encrypted */
if (ext4_encrypted_inode(dir)) {
err = ext4_get_encryption_info(dir);
err = fscrypt_get_encryption_info(dir);
if (err < 0) {
brelse(bh);
return err;
}
err = ext4_fname_crypto_alloc_buffer(dir, EXT4_NAME_LEN,
err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN,
&fname_crypto_str);
if (err < 0) {
brelse(bh);
@ -1002,10 +1004,13 @@ static int htree_dirblock_to_tree(struct file *dir_file,
&tmp_str);
} else {
int save_len = fname_crypto_str.len;
struct fscrypt_str de_name = FSTR_INIT(de->name,
de->name_len);
/* Directory is encrypted */
err = ext4_fname_disk_to_usr(dir, hinfo, de,
&fname_crypto_str);
err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
hinfo->minor_hash, &de_name,
&fname_crypto_str);
if (err < 0) {
count = err;
goto errout;
@ -1024,7 +1029,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
errout:
brelse(bh);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
ext4_fname_crypto_free_buffer(&fname_crypto_str);
fscrypt_fname_free_buffer(&fname_crypto_str);
#endif
return count;
}
@ -1049,7 +1054,7 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
int count = 0;
int ret, err;
__u32 hashval;
struct ext4_str tmp_str;
struct fscrypt_str tmp_str;
dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
start_hash, start_minor_hash));
@ -1562,26 +1567,23 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
struct ext4_dir_entry_2 *de;
struct buffer_head *bh;
if (ext4_encrypted_inode(dir)) {
int res = ext4_get_encryption_info(dir);
if (ext4_encrypted_inode(dir)) {
int res = fscrypt_get_encryption_info(dir);
/*
* This should be a properly defined flag for
* dentry->d_flags when we uplift this to the VFS.
* d_fsdata is set to (void *) 1 if if the dentry is
* DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
* created while the directory was encrypted and we
* don't have access to the key.
* have access to the key.
*/
dentry->d_fsdata = NULL;
if (ext4_encryption_info(dir))
dentry->d_fsdata = (void *) 1;
d_set_d_op(dentry, &ext4_encrypted_d_ops);
if (res && res != -ENOKEY)
return ERR_PTR(res);
}
if (fscrypt_has_encryption_key(dir))
fscrypt_set_encrypted_dentry(dentry);
fscrypt_set_d_op(dentry);
if (res && res != -ENOKEY)
return ERR_PTR(res);
}
if (dentry->d_name.len > EXT4_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
if (dentry->d_name.len > EXT4_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
if (IS_ERR(bh))
@ -1608,11 +1610,9 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
}
if (!IS_ERR(inode) && ext4_encrypted_inode(dir) &&
(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
!ext4_is_child_context_consistent_with_parent(dir,
inode)) {
!fscrypt_has_permitted_context(dir, inode)) {
int nokey = ext4_encrypted_inode(inode) &&
!ext4_encryption_info(inode);
!fscrypt_has_encryption_key(inode);
iput(inode);
if (nokey)
return ERR_PTR(-ENOKEY);
@ -2689,30 +2689,30 @@ out_stop:
/*
* routine to check that the specified directory is empty (for rmdir)
*/
int ext4_empty_dir(struct inode *inode)
bool ext4_empty_dir(struct inode *inode)
{
unsigned int offset;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de, *de1;
struct super_block *sb;
int err = 0;
if (ext4_has_inline_data(inode)) {
int has_inline_data = 1;
int ret;
err = empty_inline_dir(inode, &has_inline_data);
ret = empty_inline_dir(inode, &has_inline_data);
if (has_inline_data)
return err;
return ret;
}
sb = inode->i_sb;
if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) {
EXT4_ERROR_INODE(inode, "invalid size");
return 1;
return true;
}
bh = ext4_read_dirblock(inode, 0, EITHER);
if (IS_ERR(bh))
return 1;
return true;
de = (struct ext4_dir_entry_2 *) bh->b_data;
de1 = ext4_next_entry(de, sb->s_blocksize);
@ -2721,7 +2721,7 @@ int ext4_empty_dir(struct inode *inode)
strcmp(".", de->name) || strcmp("..", de1->name)) {
ext4_warning_inode(inode, "directory missing '.' and/or '..'");
brelse(bh);
return 1;
return true;
}
offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) +
ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize);
@ -2729,12 +2729,11 @@ int ext4_empty_dir(struct inode *inode)
while (offset < inode->i_size) {
if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
unsigned int lblock;
err = 0;
brelse(bh);
lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
bh = ext4_read_dirblock(inode, lblock, EITHER);
if (IS_ERR(bh))
return 1;
return true;
de = (struct ext4_dir_entry_2 *) bh->b_data;
}
if (ext4_check_dir_entry(inode, NULL, de, bh,
@ -2746,13 +2745,13 @@ int ext4_empty_dir(struct inode *inode)
}
if (le32_to_cpu(de->inode)) {
brelse(bh);
return 0;
return false;
}
offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
de = ext4_next_entry(de, sb->s_blocksize);
}
brelse(bh);
return 1;
return true;
}
/*
@ -3075,8 +3074,8 @@ static int ext4_symlink(struct inode *dir,
int err, len = strlen(symname);
int credits;
bool encryption_required;
struct ext4_str disk_link;
struct ext4_encrypted_symlink_data *sd = NULL;
struct fscrypt_str disk_link;
struct fscrypt_symlink_data *sd = NULL;
disk_link.len = len + 1;
disk_link.name = (char *) symname;
@ -3084,13 +3083,13 @@ static int ext4_symlink(struct inode *dir,
encryption_required = (ext4_encrypted_inode(dir) ||
DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb)));
if (encryption_required) {
err = ext4_get_encryption_info(dir);
err = fscrypt_get_encryption_info(dir);
if (err)
return err;
if (ext4_encryption_info(dir) == NULL)
if (!fscrypt_has_encryption_key(dir))
return -EPERM;
disk_link.len = (ext4_fname_encrypted_size(dir, len) +
sizeof(struct ext4_encrypted_symlink_data));
disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
sizeof(struct fscrypt_symlink_data));
sd = kzalloc(disk_link.len, GFP_KERNEL);
if (!sd)
return -ENOMEM;
@ -3138,13 +3137,12 @@ static int ext4_symlink(struct inode *dir,
if (encryption_required) {
struct qstr istr;
struct ext4_str ostr;
struct fscrypt_str ostr =
FSTR_INIT(sd->encrypted_path, disk_link.len);
istr.name = (const unsigned char *) symname;
istr.len = len;
ostr.name = sd->encrypted_path;
ostr.len = disk_link.len;
err = ext4_fname_usr_to_disk(inode, &istr, &ostr);
err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
if (err < 0)
goto err_drop_inode;
sd->len = cpu_to_le16(ostr.len);
@ -3233,7 +3231,7 @@ static int ext4_link(struct dentry *old_dentry,
if (inode->i_nlink >= EXT4_LINK_MAX)
return -EMLINK;
if (ext4_encrypted_inode(dir) &&
!ext4_is_child_context_consistent_with_parent(dir, inode))
!fscrypt_has_permitted_context(dir, inode))
return -EPERM;
if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
@ -3556,8 +3554,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
if ((old.dir != new.dir) &&
ext4_encrypted_inode(new.dir) &&
!ext4_is_child_context_consistent_with_parent(new.dir,
old.inode)) {
!fscrypt_has_permitted_context(new.dir, old.inode)) {
retval = -EPERM;
goto end_rename;
}
@ -3729,10 +3726,8 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
if ((ext4_encrypted_inode(old_dir) ||
ext4_encrypted_inode(new_dir)) &&
(old_dir != new_dir) &&
(!ext4_is_child_context_consistent_with_parent(new_dir,
old.inode) ||
!ext4_is_child_context_consistent_with_parent(old_dir,
new.inode)))
(!fscrypt_has_permitted_context(new_dir, old.inode) ||
!fscrypt_has_permitted_context(old_dir, new.inode)))
return -EPERM;
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&

13
fs/ext4/page-io.c
Просмотреть файл

@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/backing-dev.h>
#include <linux/fscrypto.h>
#include "ext4_jbd2.h"
#include "xattr.h"
@ -67,7 +68,6 @@ static void ext4_finish_bio(struct bio *bio)
struct page *page = bvec->bv_page;
#ifdef CONFIG_EXT4_FS_ENCRYPTION
struct page *data_page = NULL;
struct ext4_crypto_ctx *ctx = NULL;
#endif
struct buffer_head *bh, *head;
unsigned bio_start = bvec->bv_offset;
@ -82,8 +82,7 @@ static void ext4_finish_bio(struct bio *bio)
if (!page->mapping) {
/* The bounce data pages are unmapped. */
data_page = page;
ctx = (struct ext4_crypto_ctx *)page_private(data_page);
page = ctx->w.control_page;
fscrypt_pullback_bio_page(&page, false);
}
#endif
@ -113,8 +112,8 @@ static void ext4_finish_bio(struct bio *bio)
local_irq_restore(flags);
if (!under_io) {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
if (ctx)
ext4_restore_control_page(data_page);
if (data_page)
fscrypt_restore_control_page(data_page);
#endif
end_page_writeback(page);
}
@ -472,7 +471,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
gfp_t gfp_flags = GFP_NOFS;
retry_encrypt:
data_page = ext4_encrypt(inode, page, gfp_flags);
data_page = fscrypt_encrypt_page(inode, page, gfp_flags);
if (IS_ERR(data_page)) {
ret = PTR_ERR(data_page);
if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) {
@ -510,7 +509,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
if (ret) {
out:
if (data_page)
ext4_restore_control_page(data_page);
fscrypt_restore_control_page(data_page);
printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret);
redirty_page_for_writepage(wbc, page);
do {

45
fs/ext4/readpage.c
Просмотреть файл

@ -46,37 +46,6 @@
#include "ext4.h"
/*
* Call ext4_decrypt on every single page, reusing the encryption
* context.
*/
static void completion_pages(struct work_struct *work)
{
#ifdef CONFIG_EXT4_FS_ENCRYPTION
struct ext4_crypto_ctx *ctx =
container_of(work, struct ext4_crypto_ctx, r.work);
struct bio *bio = ctx->r.bio;
struct bio_vec *bv;
int i;
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
int ret = ext4_decrypt(page);
if (ret) {
WARN_ON_ONCE(1);
SetPageError(page);
} else
SetPageUptodate(page);
unlock_page(page);
}
ext4_release_crypto_ctx(ctx);
bio_put(bio);
#else
BUG();
#endif
}
static inline bool ext4_bio_encrypted(struct bio *bio)
{
#ifdef CONFIG_EXT4_FS_ENCRYPTION
@ -104,14 +73,10 @@ static void mpage_end_io(struct bio *bio)
int i;
if (ext4_bio_encrypted(bio)) {
struct ext4_crypto_ctx *ctx = bio->bi_private;
if (bio->bi_error) {
ext4_release_crypto_ctx(ctx);
fscrypt_release_ctx(bio->bi_private);
} else {
INIT_WORK(&ctx->r.work, completion_pages);
ctx->r.bio = bio;
queue_work(ext4_read_workqueue, &ctx->r.work);
fscrypt_decrypt_bio_pages(bio->bi_private, bio);
return;
}
}
@ -274,11 +239,11 @@ int ext4_mpage_readpages(struct address_space *mapping,
bio = NULL;
}
if (bio == NULL) {
struct ext4_crypto_ctx *ctx = NULL;
struct fscrypt_ctx *ctx = NULL;
if (ext4_encrypted_inode(inode) &&
S_ISREG(inode->i_mode)) {
ctx = ext4_get_crypto_ctx(inode, GFP_NOFS);
ctx = fscrypt_get_ctx(inode, GFP_NOFS);
if (IS_ERR(ctx))
goto set_error_page;
}
@ -286,7 +251,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
min_t(int, nr_pages, BIO_MAX_PAGES));
if (!bio) {
if (ctx)
ext4_release_crypto_ctx(ctx);
fscrypt_release_ctx(ctx);
goto set_error_page;
}
bio->bi_bdev = bdev;

97
fs/ext4/super.c
Просмотреть файл

@ -945,9 +945,6 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei->i_datasync_tid = 0;
atomic_set(&ei->i_unwritten, 0);
INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
ei->i_crypt_info = NULL;
#endif
return &ei->vfs_inode;
}
@ -1026,8 +1023,7 @@ void ext4_clear_inode(struct inode *inode)
EXT4_I(inode)->jinode = NULL;
}
#ifdef CONFIG_EXT4_FS_ENCRYPTION
if (EXT4_I(inode)->i_crypt_info)
ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
fscrypt_put_encryption_info(inode, NULL);
#endif
}
@ -1094,6 +1090,90 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
return try_to_free_buffers(page);
}
#ifdef CONFIG_EXT4_FS_ENCRYPTION
static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
{
return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
}
static int ext4_key_prefix(struct inode *inode, u8 **key)
{
*key = EXT4_SB(inode->i_sb)->key_prefix;
return EXT4_SB(inode->i_sb)->key_prefix_size;
}
static int ext4_prepare_context(struct inode *inode)
{
return ext4_convert_inline_data(inode);
}
static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
void *fs_data)
{
handle_t *handle;
int res, res2;
/* fs_data is null when internally used. */
if (fs_data) {
res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
len, 0);
if (!res) {
ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
ext4_clear_inode_state(inode,
EXT4_STATE_MAY_INLINE_DATA);
}
return res;
}
handle = ext4_journal_start(inode, EXT4_HT_MISC,
ext4_jbd2_credits_xattr(inode));
if (IS_ERR(handle))
return PTR_ERR(handle);
res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
len, 0);
if (!res) {
ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
res = ext4_mark_inode_dirty(handle, inode);
if (res)
EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
}
res2 = ext4_journal_stop(handle);
if (!res)
res = res2;
return res;
}
static int ext4_dummy_context(struct inode *inode)
{
return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
}
static unsigned ext4_max_namelen(struct inode *inode)
{
return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
EXT4_NAME_LEN;
}
static struct fscrypt_operations ext4_cryptops = {
.get_context = ext4_get_context,
.key_prefix = ext4_key_prefix,
.prepare_context = ext4_prepare_context,
.set_context = ext4_set_context,
.dummy_context = ext4_dummy_context,
.is_encrypted = ext4_encrypted_inode,
.empty_dir = ext4_empty_dir,
.max_namelen = ext4_max_namelen,
};
#else
static struct fscrypt_operations ext4_cryptops = {
.is_encrypted = ext4_encrypted_inode,
};
#endif
#ifdef CONFIG_QUOTA
static char *quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
@ -3693,6 +3773,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
sb->s_op = &ext4_sops;
sb->s_export_op = &ext4_export_ops;
sb->s_xattr = ext4_xattr_handlers;
sb->s_cop = &ext4_cryptops;
#ifdef CONFIG_QUOTA
sb->dq_op = &ext4_quota_operations;
if (ext4_has_feature_quota(sb))
@ -4003,6 +4084,11 @@ no_journal:
ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
kfree(orig_data);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
memcpy(sbi->key_prefix, EXT4_KEY_DESC_PREFIX,
EXT4_KEY_DESC_PREFIX_SIZE);
sbi->key_prefix_size = EXT4_KEY_DESC_PREFIX_SIZE;
#endif
return 0;
cantfind_ext4:
@ -5431,7 +5517,6 @@ out5:
static void __exit ext4_exit_fs(void)
{
ext4_exit_crypto();
ext4_destroy_lazyinit_thread();
unregister_as_ext2();
unregister_as_ext3();

35
fs/ext4/symlink.c
Просмотреть файл

@ -22,23 +22,22 @@
#include "ext4.h"
#include "xattr.h"
#ifdef CONFIG_EXT4_FS_ENCRYPTION
static const char *ext4_encrypted_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
struct ext4_str cstr, pstr;
struct ext4_encrypted_symlink_data *sd;
struct fscrypt_str cstr, pstr;
struct fscrypt_symlink_data *sd;
loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
int res;
u32 plen, max_size = inode->i_sb->s_blocksize;
u32 max_size = inode->i_sb->s_blocksize;
if (!dentry)
return ERR_PTR(-ECHILD);
res = ext4_get_encryption_info(inode);
res = fscrypt_get_encryption_info(inode);
if (res)
return ERR_PTR(res);
@ -54,30 +53,27 @@ static const char *ext4_encrypted_get_link(struct dentry *dentry,
}
/* Symlink is encrypted */
sd = (struct ext4_encrypted_symlink_data *)caddr;
sd = (struct fscrypt_symlink_data *)caddr;
cstr.name = sd->encrypted_path;
cstr.len = le16_to_cpu(sd->len);
if ((cstr.len +
sizeof(struct ext4_encrypted_symlink_data) - 1) >
max_size) {
if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
/* Symlink data on the disk is corrupted */
res = -EFSCORRUPTED;
goto errout;
}
plen = (cstr.len < EXT4_FNAME_CRYPTO_DIGEST_SIZE*2) ?
EXT4_FNAME_CRYPTO_DIGEST_SIZE*2 : cstr.len;
paddr = kmalloc(plen + 1, GFP_NOFS);
if (!paddr) {
res = -ENOMEM;
res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
if (res)
goto errout;
}
pstr.name = paddr;
pstr.len = plen;
res = _ext4_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
if (res < 0)
goto errout;
paddr = pstr.name;
/* Null-terminate the name */
if (res <= plen)
if (res <= pstr.len)
paddr[res] = '\0';
if (cpage)
put_page(cpage);
@ -99,7 +95,6 @@ const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
};
#endif
const struct inode_operations ext4_symlink_inode_operations = {
.readlink = generic_readlink,