}
ctx->w.control_page = NULL;
if (ctx->flags & F2FS_CTX_REQUIRES_FREE_ENCRYPT_FL) {
- if (ctx->tfm)
- crypto_free_tfm(ctx->tfm);
kmem_cache_free(f2fs_crypto_ctx_cachep, ctx);
} else {
spin_lock_irqsave(&f2fs_crypto_ctx_lock, flags);
struct f2fs_crypto_ctx *f2fs_get_crypto_ctx(struct inode *inode)
{
struct f2fs_crypto_ctx *ctx = NULL;
- int res = 0;
unsigned long flags;
struct f2fs_crypt_info *ci = F2FS_I(inode)->i_crypt_info;
spin_unlock_irqrestore(&f2fs_crypto_ctx_lock, flags);
if (!ctx) {
ctx = kmem_cache_zalloc(f2fs_crypto_ctx_cachep, GFP_NOFS);
- if (!ctx) {
- res = -ENOMEM;
- goto out;
- }
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
ctx->flags |= F2FS_CTX_REQUIRES_FREE_ENCRYPT_FL;
} else {
ctx->flags &= ~F2FS_CTX_REQUIRES_FREE_ENCRYPT_FL;
}
ctx->flags &= ~F2FS_WRITE_PATH_FL;
-
- /*
- * Allocate a new Crypto API context if we don't already have
- * one or if it isn't the right mode.
- */
- if (ctx->tfm && (ctx->mode != ci->ci_data_mode)) {
- crypto_free_tfm(ctx->tfm);
- ctx->tfm = NULL;
- ctx->mode = F2FS_ENCRYPTION_MODE_INVALID;
- }
- if (!ctx->tfm) {
- switch (ci->ci_data_mode) {
- case F2FS_ENCRYPTION_MODE_AES_256_XTS:
- ctx->tfm = crypto_ablkcipher_tfm(
- crypto_alloc_ablkcipher("xts(aes)", 0, 0));
- break;
- case F2FS_ENCRYPTION_MODE_AES_256_GCM:
- /*
- * TODO(mhalcrow): AEAD w/ gcm(aes);
- * crypto_aead_setauthsize()
- */
- ctx->tfm = ERR_PTR(-ENOTSUPP);
- break;
- default:
- BUG();
- }
- if (IS_ERR_OR_NULL(ctx->tfm)) {
- res = PTR_ERR(ctx->tfm);
- ctx->tfm = NULL;
- goto out;
- }
- ctx->mode = ci->ci_data_mode;
- }
- BUG_ON(ci->ci_size != f2fs_encryption_key_size(ci->ci_data_mode));
-
-out:
- if (res) {
- if (!IS_ERR_OR_NULL(ctx))
- f2fs_release_crypto_ctx(ctx);
- ctx = ERR_PTR(res);
- }
return ctx;
}
{
struct f2fs_crypto_ctx *pos, *n;
- list_for_each_entry_safe(pos, n, &f2fs_free_crypto_ctxs, free_list) {
- if (pos->tfm)
- crypto_free_tfm(pos->tfm);
+ list_for_each_entry_safe(pos, n, &f2fs_free_crypto_ctxs, free_list)
kmem_cache_free(f2fs_crypto_ctx_cachep, pos);
- }
INIT_LIST_HEAD(&f2fs_free_crypto_ctxs);
if (f2fs_bounce_page_pool)
mempool_destroy(f2fs_bounce_page_pool);
struct ablkcipher_request *req = NULL;
DECLARE_F2FS_COMPLETION_RESULT(ecr);
struct scatterlist dst, src;
- struct f2fs_inode_info *fi = F2FS_I(inode);
- struct crypto_ablkcipher *atfm = __crypto_ablkcipher_cast(ctx->tfm);
+ struct f2fs_crypt_info *ci = F2FS_I(inode)->i_crypt_info;
+ struct crypto_ablkcipher *tfm = ci->ci_ctfm;
int res = 0;
- BUG_ON(!ctx->tfm);
- BUG_ON(ctx->mode != fi->i_crypt_info->ci_data_mode);
-
- if (ctx->mode != F2FS_ENCRYPTION_MODE_AES_256_XTS) {
- printk_ratelimited(KERN_ERR
- "%s: unsupported crypto algorithm: %d\n",
- __func__, ctx->mode);
- return -ENOTSUPP;
- }
-
- crypto_ablkcipher_clear_flags(atfm, ~0);
- crypto_tfm_set_flags(ctx->tfm, CRYPTO_TFM_REQ_WEAK_KEY);
-
- res = crypto_ablkcipher_setkey(atfm, fi->i_crypt_info->ci_raw,
- fi->i_crypt_info->ci_size);
- if (res) {
- printk_ratelimited(KERN_ERR
- "%s: crypto_ablkcipher_setkey() failed\n",
- __func__);
- return res;
- }
- req = ablkcipher_request_alloc(atfm, GFP_NOFS);
+ req = ablkcipher_request_alloc(tfm, GFP_NOFS);
if (!req) {
printk_ratelimited(KERN_ERR
"%s: crypto_request_alloc() failed\n",
return cp - dst;
}
-int f2fs_setup_fname_crypto(struct inode *inode)
-{
- struct f2fs_inode_info *fi = F2FS_I(inode);
- struct f2fs_crypt_info *ci = fi->i_crypt_info;
- struct crypto_ablkcipher *ctfm;
- int res;
-
- /* Check if the crypto policy is set on the inode */
- res = f2fs_encrypted_inode(inode);
- if (res == 0)
- return 0;
-
- res = f2fs_get_encryption_info(inode);
- if (res < 0)
- return res;
- ci = fi->i_crypt_info;
-
- if (!ci || ci->ci_ctfm)
- return 0;
-
- if (ci->ci_filename_mode != F2FS_ENCRYPTION_MODE_AES_256_CTS) {
- printk_once(KERN_WARNING "f2fs: unsupported key mode %d\n",
- ci->ci_filename_mode);
- return -ENOKEY;
- }
-
- ctfm = crypto_alloc_ablkcipher("cts(cbc(aes))", 0, 0);
- if (!ctfm || IS_ERR(ctfm)) {
- res = ctfm ? PTR_ERR(ctfm) : -ENOMEM;
- printk(KERN_DEBUG "%s: error (%d) allocating crypto tfm\n",
- __func__, res);
- return res;
- }
- crypto_ablkcipher_clear_flags(ctfm, ~0);
- crypto_tfm_set_flags(crypto_ablkcipher_tfm(ctfm),
- CRYPTO_TFM_REQ_WEAK_KEY);
-
- res = crypto_ablkcipher_setkey(ctfm, ci->ci_raw, ci->ci_size);
- if (res) {
- crypto_free_ablkcipher(ctfm);
- return -EIO;
- }
- ci->ci_ctfm = ctfm;
- return 0;
-}
-
/**
* f2fs_fname_crypto_round_up() -
*
fname->disk_name.len = iname->len;
return 0;
}
- ret = f2fs_setup_fname_crypto(dir);
+ ret = f2fs_get_encryption_info(dir);
if (ret)
return ret;
ci = F2FS_I(dir)->i_crypt_info;
return res;
}
-void f2fs_free_encryption_info(struct inode *inode)
+static void f2fs_free_crypt_info(struct f2fs_crypt_info *ci)
{
- struct f2fs_inode_info *fi = F2FS_I(inode);
- struct f2fs_crypt_info *ci = fi->i_crypt_info;
-
if (!ci)
return;
if (ci->ci_keyring_key)
key_put(ci->ci_keyring_key);
crypto_free_ablkcipher(ci->ci_ctfm);
- memzero_explicit(&ci->ci_raw, sizeof(ci->ci_raw));
kmem_cache_free(f2fs_crypt_info_cachep, ci);
- fi->i_crypt_info = NULL;
+}
+
+void f2fs_free_encryption_info(struct inode *inode, struct f2fs_crypt_info *ci)
+{
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ struct f2fs_crypt_info *prev;
+
+ if (ci == NULL)
+ ci = ACCESS_ONCE(fi->i_crypt_info);
+ if (ci == NULL)
+ return;
+ prev = cmpxchg(&fi->i_crypt_info, ci, NULL);
+ if (prev != ci)
+ return;
+
+ f2fs_free_crypt_info(ci);
}
int _f2fs_get_encryption_info(struct inode *inode)
struct f2fs_encryption_key *master_key;
struct f2fs_encryption_context ctx;
struct user_key_payload *ukp;
+ struct crypto_ablkcipher *ctfm;
+ const char *cipher_str;
+ char raw_key[F2FS_MAX_KEY_SIZE];
+ char mode;
int res;
res = f2fs_crypto_initialize();
if (res)
return res;
-
- if (fi->i_crypt_info) {
- if (!fi->i_crypt_info->ci_keyring_key ||
- key_validate(fi->i_crypt_info->ci_keyring_key) == 0)
+retry:
+ crypt_info = ACCESS_ONCE(fi->i_crypt_info);
+ if (crypt_info) {
+ if (!crypt_info->ci_keyring_key ||
+ key_validate(crypt_info->ci_keyring_key) == 0)
return 0;
- f2fs_free_encryption_info(inode);
+ f2fs_free_encryption_info(inode, crypt_info);
+ goto retry;
}
res = f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
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))
- crypt_info->ci_size =
- f2fs_encryption_key_size(crypt_info->ci_data_mode);
+ mode = crypt_info->ci_data_mode;
else if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
- crypt_info->ci_size =
- f2fs_encryption_key_size(crypt_info->ci_filename_mode);
+ mode = crypt_info->ci_filename_mode;
else
BUG();
- BUG_ON(!crypt_info->ci_size);
+ switch (mode) {
+ case F2FS_ENCRYPTION_MODE_AES_256_XTS:
+ cipher_str = "xts(aes)";
+ break;
+ case F2FS_ENCRYPTION_MODE_AES_256_CTS:
+ cipher_str = "cts(cbc(aes))";
+ break;
+ default:
+ printk_once(KERN_WARNING
+ "f2fs: unsupported key mode %d (ino %u)\n",
+ mode, (unsigned) inode->i_ino);
+ res = -ENOKEY;
+ goto out;
+ }
memcpy(full_key_descriptor, F2FS_KEY_DESC_PREFIX,
F2FS_KEY_DESC_PREFIX_SIZE);
keyring_key = NULL;
goto out;
}
+ crypt_info->ci_keyring_key = keyring_key;
BUG_ON(keyring_key->type != &key_type_logon);
ukp = ((struct user_key_payload *)keyring_key->payload.data);
if (ukp->datalen != sizeof(struct f2fs_encryption_key)) {
F2FS_KEY_DERIVATION_NONCE_SIZE);
BUG_ON(master_key->size != F2FS_AES_256_XTS_KEY_SIZE);
res = f2fs_derive_key_aes(ctx.nonce, master_key->raw,
- crypt_info->ci_raw);
-out:
- if (res < 0) {
- if (res == -ENOKEY)
- res = 0;
- kmem_cache_free(f2fs_crypt_info_cachep, crypt_info);
- } else {
- fi->i_crypt_info = crypt_info;
- crypt_info->ci_keyring_key = keyring_key;
- keyring_key = NULL;
+ raw_key);
+ if (res)
+ goto out;
+
+ ctfm = crypto_alloc_ablkcipher(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;
}
- if (keyring_key)
- key_put(keyring_key);
+ crypt_info->ci_ctfm = ctfm;
+ crypto_ablkcipher_clear_flags(ctfm, ~0);
+ crypto_tfm_set_flags(crypto_ablkcipher_tfm(ctfm),
+ CRYPTO_TFM_REQ_WEAK_KEY);
+ res = crypto_ablkcipher_setkey(ctfm, raw_key,
+ f2fs_encryption_key_size(mode));
+ if (res)
+ goto out;
+
+ memzero_explicit(raw_key, sizeof(raw_key));
+ if (cmpxchg(&fi->i_crypt_info, NULL, crypt_info) != NULL) {
+ f2fs_free_crypt_info(crypt_info);
+ goto retry;
+ }
+ return 0;
+
+out:
+ if (res == -ENOKEY && !S_ISREG(inode->i_mode))
+ res = 0;
+
+ f2fs_free_crypt_info(crypt_info);
+ memzero_explicit(raw_key, sizeof(raw_key));
return res;
}
struct f2fs_str fstr = FSTR_INIT(NULL, 0);
int err = 0;
- err = f2fs_setup_fname_crypto(inode);
- if (err)
- return err;
-
if (f2fs_encrypted_inode(inode)) {
+ err = f2fs_get_encryption_info(inode);
+ if (err)
+ return err;
+
err = f2fs_fname_crypto_alloc_buffer(inode, F2FS_NAME_LEN,
&fstr);
if (err < 0)
void f2fs_end_io_crypto_work(struct f2fs_crypto_ctx *, struct bio *);
/* crypto_key.c */
-void f2fs_free_encryption_info(struct inode *);
+void f2fs_free_encryption_info(struct inode *, struct f2fs_crypt_info *);
int _f2fs_get_encryption_info(struct inode *inode);
/* crypto_fname.c */
return 0;
}
-int f2fs_setup_fname_crypto(struct inode *);
void f2fs_fname_crypto_free_buffer(struct f2fs_str *);
int f2fs_fname_setup_filename(struct inode *, const struct qstr *,
int lookup, struct f2fs_filename *);
static inline int f2fs_has_encryption_key(struct inode *i) { return 0; }
static inline int f2fs_get_encryption_info(struct inode *i) { return 0; }
-
-static inline int f2fs_setup_fname_crypto(struct inode *i) { return 0; }
static inline void f2fs_fname_crypto_free_buffer(struct f2fs_str *p) { }
static inline int f2fs_fname_setup_filename(struct inode *dir,
} __attribute__((__packed__));
struct f2fs_crypt_info {
- unsigned char ci_size;
char ci_data_mode;
char ci_filename_mode;
char ci_flags;
struct crypto_ablkcipher *ci_ctfm;
struct key *ci_keyring_key;
- char ci_raw[F2FS_MAX_KEY_SIZE];
char ci_master_key[F2FS_KEY_DESCRIPTOR_SIZE];
};
#define F2FS_WRITE_PATH_FL 0x00000004
struct f2fs_crypto_ctx {
- struct crypto_tfm *tfm; /* Crypto API context */
union {
struct {
struct page *bounce_page; /* Ciphertext page */
struct list_head free_list; /* Free list */
};
char flags; /* Flags */
- char mode; /* Encryption mode for tfm */
};
struct f2fs_completion_result {
out_clear:
#ifdef CONFIG_F2FS_FS_ENCRYPTION
if (F2FS_I(inode)->i_crypt_info)
- f2fs_free_encryption_info(inode);
+ f2fs_free_encryption_info(inode, F2FS_I(inode)->i_crypt_info);
#endif
clear_inode(inode);
}
if (err)
goto err_out;
- err = f2fs_setup_fname_crypto(inode);
+ err = f2fs_get_encryption_info(inode);
if (err)
goto err_out;
u32 max_size = inode->i_sb->s_blocksize;
int res;
- res = f2fs_setup_fname_crypto(inode);
+ res = f2fs_get_encryption_info(inode);
if (res)
return ERR_PTR(res);
#ifdef CONFIG_F2FS_FS_ENCRYPTION
if (F2FS_I(inode)->i_crypt_info)
- f2fs_free_encryption_info(inode);
+ f2fs_free_encryption_info(inode,
+ F2FS_I(inode)->i_crypt_info);
#endif
spin_lock(&inode->i_lock);
}
projects / deliverable / linux.git / commitdiff
