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-rw-r--r--fs/ext4/crypto.c536
-rw-r--r--fs/ext4/crypto_fname.c468
-rw-r--r--fs/ext4/crypto_key.c274
-rw-r--r--fs/ext4/crypto_policy.c232
-rw-r--r--fs/ext4/ext4_crypto.h159
-rw-r--r--fs/xfs/xfs_xattr.c1
6 files changed, 1 insertions, 1669 deletions
diff --git a/fs/ext4/crypto.c b/fs/ext4/crypto.c
deleted file mode 100644
index 6a6c27373..000000000
--- a/fs/ext4/crypto.c
+++ /dev/null
@@ -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,
-};
diff --git a/fs/ext4/crypto_fname.c b/fs/ext4/crypto_fname.c
deleted file mode 100644
index 1a2f36040..000000000
--- a/fs/ext4/crypto_fname.c
+++ /dev/null
@@ -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;
-}
diff --git a/fs/ext4/crypto_key.c b/fs/ext4/crypto_key.c
deleted file mode 100644
index 0129d688d..000000000
--- a/fs/ext4/crypto_key.c
+++ /dev/null
@@ -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);
-}
diff --git a/fs/ext4/crypto_policy.c b/fs/ext4/crypto_policy.c
deleted file mode 100644
index 8a9feb341..000000000
--- a/fs/ext4/crypto_policy.c
+++ /dev/null
@@ -1,232 +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 (!inode_owner_or_capable(inode))
- return -EACCES;
-
- 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;
-}
diff --git a/fs/ext4/ext4_crypto.h b/fs/ext4/ext4_crypto.h
deleted file mode 100644
index 1f73c2971..000000000
--- a/fs/ext4/ext4_crypto.h
+++ /dev/null
@@ -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 */
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index ea62245fe..62900938f 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -147,6 +147,7 @@ __xfs_xattr_put_listent(
arraytop = context->count + prefix_len + namelen + 1;
if (arraytop > context->firstu) {
context->count = -1; /* insufficient space */
+ context->seen_enough = 1;
return 0;
}
offset = (char *)context->alist + context->count;