f2fs crypto: add f2fs encryption facilities
Most of parts were copied from ext4, except: - add f2fs_restore_and_release_control_page which returns control page and restore control page - remove ext4_encrypted_zeroout() - remove sbi->s_file_encryption_mode & sbi->s_dir_encryption_mode - add f2fs_end_io_crypto_work for mpage_end_io Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
Родитель
f424f664f0
Коммит
57e5055b0a
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@ -6,4 +6,4 @@ f2fs-$(CONFIG_F2FS_STAT_FS) += debug.o
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f2fs-$(CONFIG_F2FS_FS_XATTR) += xattr.o
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f2fs-$(CONFIG_F2FS_FS_POSIX_ACL) += acl.o
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f2fs-$(CONFIG_F2FS_IO_TRACE) += trace.o
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f2fs-$(CONFIG_F2FS_FS_ENCRYPTION) += crypto_policy.o
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f2fs-$(CONFIG_F2FS_FS_ENCRYPTION) += crypto_policy.o crypto.o
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@ -0,0 +1,560 @@
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/*
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* linux/fs/f2fs/crypto.c
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*
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* Copied from linux/fs/ext4/crypto.c
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*
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* Copyright (C) 2015, Google, Inc.
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* Copyright (C) 2015, Motorola Mobility
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*
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* This contains encryption functions for f2fs
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*
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* Written by Michael Halcrow, 2014.
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*
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* Filename encryption additions
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* Uday Savagaonkar, 2014
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* Encryption policy handling additions
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* Ildar Muslukhov, 2014
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* Remove ext4_encrypted_zeroout(),
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* add f2fs_restore_and_release_control_page()
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* Jaegeuk Kim, 2015.
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*
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* This has not yet undergone a rigorous security audit.
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*
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* The usage of AES-XTS should conform to recommendations in NIST
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* Special Publication 800-38E and IEEE P1619/D16.
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*/
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#include <crypto/hash.h>
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#include <crypto/sha.h>
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#include <keys/user-type.h>
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#include <keys/encrypted-type.h>
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#include <linux/crypto.h>
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#include <linux/ecryptfs.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/key.h>
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#include <linux/list.h>
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#include <linux/mempool.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/random.h>
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#include <linux/scatterlist.h>
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#include <linux/spinlock_types.h>
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#include <linux/f2fs_fs.h>
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#include <linux/ratelimit.h>
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#include <linux/bio.h>
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#include "f2fs.h"
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#include "xattr.h"
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/* Encryption added and removed here! (L: */
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static unsigned int num_prealloc_crypto_pages = 32;
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static unsigned int num_prealloc_crypto_ctxs = 128;
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module_param(num_prealloc_crypto_pages, uint, 0444);
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MODULE_PARM_DESC(num_prealloc_crypto_pages,
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"Number of crypto pages to preallocate");
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module_param(num_prealloc_crypto_ctxs, uint, 0444);
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MODULE_PARM_DESC(num_prealloc_crypto_ctxs,
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"Number of crypto contexts to preallocate");
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static mempool_t *f2fs_bounce_page_pool;
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static LIST_HEAD(f2fs_free_crypto_ctxs);
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static DEFINE_SPINLOCK(f2fs_crypto_ctx_lock);
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struct workqueue_struct *f2fs_read_workqueue;
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static DEFINE_MUTEX(crypto_init);
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/**
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* f2fs_release_crypto_ctx() - Releases an encryption context
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* @ctx: The encryption context to release.
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*
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* If the encryption context was allocated from the pre-allocated pool, returns
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* it to that pool. Else, frees it.
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*
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* If there's a bounce page in the context, this frees that.
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*/
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void f2fs_release_crypto_ctx(struct f2fs_crypto_ctx *ctx)
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{
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unsigned long flags;
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if (ctx->bounce_page) {
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if (ctx->flags & F2FS_BOUNCE_PAGE_REQUIRES_FREE_ENCRYPT_FL)
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__free_page(ctx->bounce_page);
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else
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mempool_free(ctx->bounce_page, f2fs_bounce_page_pool);
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ctx->bounce_page = NULL;
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}
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ctx->control_page = NULL;
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if (ctx->flags & F2FS_CTX_REQUIRES_FREE_ENCRYPT_FL) {
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if (ctx->tfm)
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crypto_free_tfm(ctx->tfm);
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kfree(ctx);
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} else {
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spin_lock_irqsave(&f2fs_crypto_ctx_lock, flags);
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list_add(&ctx->free_list, &f2fs_free_crypto_ctxs);
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spin_unlock_irqrestore(&f2fs_crypto_ctx_lock, flags);
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}
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}
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/**
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* f2fs_alloc_and_init_crypto_ctx() - Allocates and inits an encryption context
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* @mask: The allocation mask.
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*
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* Return: An allocated and initialized encryption context on success. An error
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* value or NULL otherwise.
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*/
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static struct f2fs_crypto_ctx *f2fs_alloc_and_init_crypto_ctx(gfp_t mask)
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{
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struct f2fs_crypto_ctx *ctx = kzalloc(sizeof(struct f2fs_crypto_ctx),
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mask);
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if (!ctx)
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return ERR_PTR(-ENOMEM);
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return ctx;
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}
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/**
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* f2fs_get_crypto_ctx() - Gets an encryption context
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* @inode: The inode for which we are doing the crypto
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*
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* Allocates and initializes an encryption context.
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*
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* Return: An allocated and initialized encryption context on success; error
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* value or NULL otherwise.
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*/
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struct f2fs_crypto_ctx *f2fs_get_crypto_ctx(struct inode *inode)
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{
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struct f2fs_crypto_ctx *ctx = NULL;
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int res = 0;
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unsigned long flags;
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struct f2fs_crypt_info *ci = F2FS_I(inode)->i_crypt_info;
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BUG_ON(ci == NULL);
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/*
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* We first try getting the ctx from a free list because in
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* the common case the ctx will have an allocated and
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* initialized crypto tfm, so it's probably a worthwhile
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* optimization. For the bounce page, we first try getting it
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* from the kernel allocator because that's just about as fast
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* as getting it from a list and because a cache of free pages
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* should generally be a "last resort" option for a filesystem
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* to be able to do its job.
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*/
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spin_lock_irqsave(&f2fs_crypto_ctx_lock, flags);
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ctx = list_first_entry_or_null(&f2fs_free_crypto_ctxs,
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struct f2fs_crypto_ctx, free_list);
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if (ctx)
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list_del(&ctx->free_list);
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spin_unlock_irqrestore(&f2fs_crypto_ctx_lock, flags);
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if (!ctx) {
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ctx = f2fs_alloc_and_init_crypto_ctx(GFP_NOFS);
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if (IS_ERR(ctx)) {
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res = PTR_ERR(ctx);
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goto out;
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}
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ctx->flags |= F2FS_CTX_REQUIRES_FREE_ENCRYPT_FL;
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} else {
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ctx->flags &= ~F2FS_CTX_REQUIRES_FREE_ENCRYPT_FL;
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}
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/*
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* Allocate a new Crypto API context if we don't already have
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* one or if it isn't the right mode.
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*/
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BUG_ON(ci->ci_mode == F2FS_ENCRYPTION_MODE_INVALID);
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if (ctx->tfm && (ctx->mode != ci->ci_mode)) {
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crypto_free_tfm(ctx->tfm);
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ctx->tfm = NULL;
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ctx->mode = F2FS_ENCRYPTION_MODE_INVALID;
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}
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if (!ctx->tfm) {
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switch (ci->ci_mode) {
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case F2FS_ENCRYPTION_MODE_AES_256_XTS:
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ctx->tfm = crypto_ablkcipher_tfm(
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crypto_alloc_ablkcipher("xts(aes)", 0, 0));
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break;
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case F2FS_ENCRYPTION_MODE_AES_256_GCM:
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/*
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* TODO(mhalcrow): AEAD w/ gcm(aes);
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* crypto_aead_setauthsize()
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*/
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ctx->tfm = ERR_PTR(-ENOTSUPP);
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break;
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default:
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BUG();
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}
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if (IS_ERR_OR_NULL(ctx->tfm)) {
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res = PTR_ERR(ctx->tfm);
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ctx->tfm = NULL;
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goto out;
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}
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ctx->mode = ci->ci_mode;
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}
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BUG_ON(ci->ci_size != f2fs_encryption_key_size(ci->ci_mode));
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/*
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* There shouldn't be a bounce page attached to the crypto
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* context at this point.
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*/
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BUG_ON(ctx->bounce_page);
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out:
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if (res) {
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if (!IS_ERR_OR_NULL(ctx))
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f2fs_release_crypto_ctx(ctx);
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ctx = ERR_PTR(res);
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}
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return ctx;
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}
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/*
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* Call f2fs_decrypt on every single page, reusing the encryption
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* context.
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*/
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static void completion_pages(struct work_struct *work)
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{
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struct f2fs_crypto_ctx *ctx =
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container_of(work, struct f2fs_crypto_ctx, work);
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struct bio *bio = ctx->bio;
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struct bio_vec *bv;
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int i;
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bio_for_each_segment_all(bv, bio, i) {
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struct page *page = bv->bv_page;
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int ret = f2fs_decrypt(ctx, page);
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if (ret) {
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WARN_ON_ONCE(1);
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SetPageError(page);
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} else
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SetPageUptodate(page);
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unlock_page(page);
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}
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f2fs_release_crypto_ctx(ctx);
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bio_put(bio);
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}
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void f2fs_end_io_crypto_work(struct f2fs_crypto_ctx *ctx, struct bio *bio)
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{
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INIT_WORK(&ctx->work, completion_pages);
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ctx->bio = bio;
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queue_work(f2fs_read_workqueue, &ctx->work);
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}
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/**
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* f2fs_exit_crypto() - Shutdown the f2fs encryption system
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*/
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void f2fs_exit_crypto(void)
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{
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struct f2fs_crypto_ctx *pos, *n;
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list_for_each_entry_safe(pos, n, &f2fs_free_crypto_ctxs, free_list) {
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if (pos->bounce_page) {
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if (pos->flags &
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F2FS_BOUNCE_PAGE_REQUIRES_FREE_ENCRYPT_FL)
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__free_page(pos->bounce_page);
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else
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mempool_free(pos->bounce_page,
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f2fs_bounce_page_pool);
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}
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if (pos->tfm)
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crypto_free_tfm(pos->tfm);
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kfree(pos);
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}
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INIT_LIST_HEAD(&f2fs_free_crypto_ctxs);
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if (f2fs_bounce_page_pool)
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mempool_destroy(f2fs_bounce_page_pool);
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f2fs_bounce_page_pool = NULL;
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if (f2fs_read_workqueue)
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destroy_workqueue(f2fs_read_workqueue);
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f2fs_read_workqueue = NULL;
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}
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/**
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* f2fs_init_crypto() - Set up for f2fs encryption.
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*
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* We only call this when we start accessing encrypted files, since it
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* results in memory getting allocated that wouldn't otherwise be used.
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*
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* Return: Zero on success, non-zero otherwise.
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*/
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int f2fs_init_crypto(void)
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{
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int i, res;
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mutex_lock(&crypto_init);
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if (f2fs_read_workqueue)
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goto already_initialized;
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f2fs_read_workqueue = alloc_workqueue("f2fs_crypto", WQ_HIGHPRI, 0);
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if (!f2fs_read_workqueue) {
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res = -ENOMEM;
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goto fail;
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}
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for (i = 0; i < num_prealloc_crypto_ctxs; i++) {
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struct f2fs_crypto_ctx *ctx;
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ctx = f2fs_alloc_and_init_crypto_ctx(GFP_KERNEL);
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if (IS_ERR(ctx)) {
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res = PTR_ERR(ctx);
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goto fail;
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}
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list_add(&ctx->free_list, &f2fs_free_crypto_ctxs);
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}
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f2fs_bounce_page_pool =
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mempool_create_page_pool(num_prealloc_crypto_pages, 0);
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if (!f2fs_bounce_page_pool) {
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res = -ENOMEM;
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goto fail;
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}
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already_initialized:
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mutex_unlock(&crypto_init);
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return 0;
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fail:
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f2fs_exit_crypto();
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mutex_unlock(&crypto_init);
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return res;
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}
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void f2fs_restore_and_release_control_page(struct page **page)
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{
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struct f2fs_crypto_ctx *ctx;
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struct page *bounce_page;
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/* The bounce data pages are unmapped. */
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if ((*page)->mapping)
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return;
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/* The bounce data page is unmapped. */
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bounce_page = *page;
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ctx = (struct f2fs_crypto_ctx *)page_private(bounce_page);
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/* restore control page */
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*page = ctx->control_page;
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f2fs_restore_control_page(bounce_page);
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}
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void f2fs_restore_control_page(struct page *data_page)
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{
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struct f2fs_crypto_ctx *ctx =
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(struct f2fs_crypto_ctx *)page_private(data_page);
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set_page_private(data_page, (unsigned long)NULL);
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ClearPagePrivate(data_page);
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unlock_page(data_page);
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f2fs_release_crypto_ctx(ctx);
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}
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/**
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* f2fs_crypt_complete() - The completion callback for page encryption
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* @req: The asynchronous encryption request context
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* @res: The result of the encryption operation
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*/
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static void f2fs_crypt_complete(struct crypto_async_request *req, int res)
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{
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struct f2fs_completion_result *ecr = req->data;
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if (res == -EINPROGRESS)
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return;
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ecr->res = res;
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complete(&ecr->completion);
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}
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typedef enum {
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F2FS_DECRYPT = 0,
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F2FS_ENCRYPT,
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} f2fs_direction_t;
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static int f2fs_page_crypto(struct f2fs_crypto_ctx *ctx,
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struct inode *inode,
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f2fs_direction_t rw,
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pgoff_t index,
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struct page *src_page,
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struct page *dest_page)
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{
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u8 xts_tweak[F2FS_XTS_TWEAK_SIZE];
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struct ablkcipher_request *req = NULL;
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DECLARE_F2FS_COMPLETION_RESULT(ecr);
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struct scatterlist dst, src;
|
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struct f2fs_inode_info *fi = F2FS_I(inode);
|
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struct crypto_ablkcipher *atfm = __crypto_ablkcipher_cast(ctx->tfm);
|
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int res = 0;
|
||||
|
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BUG_ON(!ctx->tfm);
|
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BUG_ON(ctx->mode != fi->i_crypt_info->ci_mode);
|
||||
|
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if (ctx->mode != F2FS_ENCRYPTION_MODE_AES_256_XTS) {
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printk_ratelimited(KERN_ERR
|
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"%s: unsupported crypto algorithm: %d\n",
|
||||
__func__, ctx->mode);
|
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return -ENOTSUPP;
|
||||
}
|
||||
|
||||
crypto_ablkcipher_clear_flags(atfm, ~0);
|
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crypto_tfm_set_flags(ctx->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
|
||||
|
||||
res = crypto_ablkcipher_setkey(atfm, fi->i_crypt_info->ci_raw,
|
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fi->i_crypt_info->ci_size);
|
||||
if (res) {
|
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printk_ratelimited(KERN_ERR
|
||||
"%s: crypto_ablkcipher_setkey() failed\n",
|
||||
__func__);
|
||||
return res;
|
||||
}
|
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req = ablkcipher_request_alloc(atfm, GFP_NOFS);
|
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if (!req) {
|
||||
printk_ratelimited(KERN_ERR
|
||||
"%s: crypto_request_alloc() failed\n",
|
||||
__func__);
|
||||
return -ENOMEM;
|
||||
}
|
||||
ablkcipher_request_set_callback(
|
||||
req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
|
||||
f2fs_crypt_complete, &ecr);
|
||||
|
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BUILD_BUG_ON(F2FS_XTS_TWEAK_SIZE < sizeof(index));
|
||||
memcpy(xts_tweak, &index, sizeof(index));
|
||||
memset(&xts_tweak[sizeof(index)], 0,
|
||||
F2FS_XTS_TWEAK_SIZE - sizeof(index));
|
||||
|
||||
sg_init_table(&dst, 1);
|
||||
sg_set_page(&dst, dest_page, PAGE_CACHE_SIZE, 0);
|
||||
sg_init_table(&src, 1);
|
||||
sg_set_page(&src, src_page, PAGE_CACHE_SIZE, 0);
|
||||
ablkcipher_request_set_crypt(req, &src, &dst, PAGE_CACHE_SIZE,
|
||||
xts_tweak);
|
||||
if (rw == F2FS_DECRYPT)
|
||||
res = crypto_ablkcipher_decrypt(req);
|
||||
else
|
||||
res = crypto_ablkcipher_encrypt(req);
|
||||
if (res == -EINPROGRESS || res == -EBUSY) {
|
||||
BUG_ON(req->base.data != &ecr);
|
||||
wait_for_completion(&ecr.completion);
|
||||
res = ecr.res;
|
||||
}
|
||||
ablkcipher_request_free(req);
|
||||
if (res) {
|
||||
printk_ratelimited(KERN_ERR
|
||||
"%s: crypto_ablkcipher_encrypt() returned %d\n",
|
||||
__func__, res);
|
||||
return res;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* f2fs_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
|
||||
* f2fs_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 *f2fs_encrypt(struct inode *inode,
|
||||
struct page *plaintext_page)
|
||||
{
|
||||
struct f2fs_crypto_ctx *ctx;
|
||||
struct page *ciphertext_page = NULL;
|
||||
int err;
|
||||
|
||||
BUG_ON(!PageLocked(plaintext_page));
|
||||
|
||||
ctx = f2fs_get_crypto_ctx(inode);
|
||||
if (IS_ERR(ctx))
|
||||
return (struct page *)ctx;
|
||||
|
||||
/* The encryption operation will require a bounce page. */
|
||||
ciphertext_page = alloc_page(GFP_NOFS);
|
||||
if (!ciphertext_page) {
|
||||
/*
|
||||
* This is a potential bottleneck, but at least we'll have
|
||||
* forward progress.
|
||||
*/
|
||||
ciphertext_page = mempool_alloc(f2fs_bounce_page_pool,
|
||||
GFP_NOFS);
|
||||
if (WARN_ON_ONCE(!ciphertext_page))
|
||||
ciphertext_page = mempool_alloc(f2fs_bounce_page_pool,
|
||||
GFP_NOFS | __GFP_WAIT);
|
||||
ctx->flags &= ~F2FS_BOUNCE_PAGE_REQUIRES_FREE_ENCRYPT_FL;
|
||||
} else {
|
||||
ctx->flags |= F2FS_BOUNCE_PAGE_REQUIRES_FREE_ENCRYPT_FL;
|
||||
}
|
||||
ctx->bounce_page = ciphertext_page;
|
||||
ctx->control_page = plaintext_page;
|
||||
err = f2fs_page_crypto(ctx, inode, F2FS_ENCRYPT, plaintext_page->index,
|
||||
plaintext_page, ciphertext_page);
|
||||
if (err) {
|
||||
f2fs_release_crypto_ctx(ctx);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
SetPagePrivate(ciphertext_page);
|
||||
set_page_private(ciphertext_page, (unsigned long)ctx);
|
||||
lock_page(ciphertext_page);
|
||||
return ciphertext_page;
|
||||
}
|
||||
|
||||
/**
|
||||
* f2fs_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 f2fs_decrypt(struct f2fs_crypto_ctx *ctx, struct page *page)
|
||||
{
|
||||
BUG_ON(!PageLocked(page));
|
||||
|
||||
return f2fs_page_crypto(ctx, page->mapping->host,
|
||||
F2FS_DECRYPT, page->index, page, page);
|
||||
}
|
||||
|
||||
/*
|
||||
* Convenience function which takes care of allocating and
|
||||
* deallocating the encryption context
|
||||
*/
|
||||
int f2fs_decrypt_one(struct inode *inode, struct page *page)
|
||||
{
|
||||
struct f2fs_crypto_ctx *ctx = f2fs_get_crypto_ctx(inode);
|
||||
int ret;
|
||||
|
||||
if (!ctx)
|
||||
return -ENOMEM;
|
||||
ret = f2fs_decrypt(ctx, page);
|
||||
f2fs_release_crypto_ctx(ctx);
|
||||
return ret;
|
||||
}
|
||||
|
||||
bool f2fs_valid_contents_enc_mode(uint32_t mode)
|
||||
{
|
||||
return (mode == F2FS_ENCRYPTION_MODE_AES_256_XTS);
|
||||
}
|
||||
|
||||
/**
|
||||
* f2fs_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 f2fs_validate_encryption_key_size(uint32_t mode, uint32_t size)
|
||||
{
|
||||
if (size == f2fs_encryption_key_size(mode))
|
||||
return size;
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1962,4 +1962,29 @@ int f2fs_is_child_context_consistent_with_parent(struct inode *,
|
|||
int f2fs_inherit_context(struct inode *, struct inode *, struct page *);
|
||||
int f2fs_process_policy(const struct f2fs_encryption_policy *, struct inode *);
|
||||
int f2fs_get_policy(struct inode *, struct f2fs_encryption_policy *);
|
||||
|
||||
/* crypt.c */
|
||||
extern struct workqueue_struct *f2fs_read_workqueue;
|
||||
bool f2fs_valid_contents_enc_mode(uint32_t);
|
||||
uint32_t f2fs_validate_encryption_key_size(uint32_t, uint32_t);
|
||||
struct f2fs_crypto_ctx *f2fs_get_crypto_ctx(struct inode *);
|
||||
void f2fs_release_crypto_ctx(struct f2fs_crypto_ctx *);
|
||||
struct page *f2fs_encrypt(struct inode *, struct page *);
|
||||
int f2fs_decrypt(struct f2fs_crypto_ctx *, struct page *);
|
||||
int f2fs_decrypt_one(struct inode *, struct page *);
|
||||
void f2fs_end_io_crypto_work(struct f2fs_crypto_ctx *, struct bio *);
|
||||
|
||||
#ifdef CONFIG_F2FS_FS_ENCRYPTION
|
||||
void f2fs_restore_and_release_control_page(struct page **);
|
||||
void f2fs_restore_control_page(struct page *);
|
||||
|
||||
int f2fs_init_crypto(void);
|
||||
void f2fs_exit_crypto(void);
|
||||
#else
|
||||
static inline void f2fs_restore_and_release_control_page(struct page **p) { }
|
||||
static inline void f2fs_restore_control_page(struct page *p) { }
|
||||
|
||||
static inline int f2fs_init_crypto(void) { return 0; }
|
||||
static inline void f2fs_exit_crypto(void) { }
|
||||
#endif
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -416,6 +416,9 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
|
|||
/* Will be used by directory only */
|
||||
fi->i_dir_level = F2FS_SB(sb)->dir_level;
|
||||
|
||||
#ifdef CONFIG_F2FS_FS_ENCRYPTION
|
||||
fi->i_crypt_info = NULL;
|
||||
#endif
|
||||
return &fi->vfs_inode;
|
||||
}
|
||||
|
||||
|
|
|
|||
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