forked from Minki/linux
Merge branch 'fscrypt' into origin
This commit is contained in:
commit
6da22013bb
@ -88,7 +88,7 @@ EXPORT_SYMBOL(fscrypt_release_ctx);
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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 fscrypt_ctx *fscrypt_get_ctx(struct inode *inode, gfp_t gfp_flags)
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struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode, gfp_t gfp_flags)
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{
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struct fscrypt_ctx *ctx = NULL;
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struct fscrypt_info *ci = inode->i_crypt_info;
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@ -146,9 +146,10 @@ typedef enum {
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FS_ENCRYPT,
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} fscrypt_direction_t;
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static int do_page_crypto(struct inode *inode,
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static int do_page_crypto(const struct inode *inode,
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fscrypt_direction_t rw, pgoff_t index,
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struct page *src_page, struct page *dest_page,
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unsigned int src_len, unsigned int src_offset,
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gfp_t gfp_flags)
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{
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struct {
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@ -179,10 +180,10 @@ static int do_page_crypto(struct inode *inode,
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memset(xts_tweak.padding, 0, sizeof(xts_tweak.padding));
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sg_init_table(&dst, 1);
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sg_set_page(&dst, dest_page, PAGE_SIZE, 0);
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sg_set_page(&dst, dest_page, src_len, src_offset);
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sg_init_table(&src, 1);
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sg_set_page(&src, src_page, PAGE_SIZE, 0);
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skcipher_request_set_crypt(req, &src, &dst, PAGE_SIZE, &xts_tweak);
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sg_set_page(&src, src_page, src_len, src_offset);
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skcipher_request_set_crypt(req, &src, &dst, src_len, &xts_tweak);
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if (rw == FS_DECRYPT)
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res = crypto_skcipher_decrypt(req);
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else
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@ -213,12 +214,17 @@ static struct page *alloc_bounce_page(struct fscrypt_ctx *ctx, gfp_t gfp_flags)
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/**
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* fscypt_encrypt_page() - Encrypts a page
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* @inode: The inode for which the encryption should take place
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* @plaintext_page: The page to encrypt. Must be locked.
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* @gfp_flags: The gfp flag for memory allocation
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* @inode: The inode for which the encryption should take place
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* @plaintext_page: The page to encrypt. Must be locked.
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* @plaintext_len: Length of plaintext within page
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* @plaintext_offset: Offset of plaintext within page
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* @index: Index for encryption. This is mainly the page index, but
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* but might be different for multiple calls on same page.
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* @gfp_flags: The gfp flag for memory allocation
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*
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* Allocates a ciphertext page and encrypts plaintext_page into it using the ctx
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* encryption context.
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* Encrypts plaintext_page using the ctx encryption context. If
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* the filesystem supports it, encryption is performed in-place, otherwise a
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* new ciphertext_page is allocated and returned.
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*
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* Called on the page write path. The caller must call
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* fscrypt_restore_control_page() on the returned ciphertext page to
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@ -227,35 +233,44 @@ static struct page *alloc_bounce_page(struct fscrypt_ctx *ctx, gfp_t gfp_flags)
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* Return: An allocated page with the encrypted content on success. Else, an
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* error value or NULL.
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*/
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struct page *fscrypt_encrypt_page(struct inode *inode,
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struct page *plaintext_page, gfp_t gfp_flags)
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struct page *fscrypt_encrypt_page(const struct inode *inode,
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struct page *plaintext_page,
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unsigned int plaintext_len,
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unsigned int plaintext_offset,
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pgoff_t index, gfp_t gfp_flags)
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{
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struct fscrypt_ctx *ctx;
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struct page *ciphertext_page = NULL;
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struct page *ciphertext_page = plaintext_page;
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int err;
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BUG_ON(!PageLocked(plaintext_page));
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BUG_ON(plaintext_len % FS_CRYPTO_BLOCK_SIZE != 0);
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ctx = fscrypt_get_ctx(inode, gfp_flags);
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if (IS_ERR(ctx))
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return (struct page *)ctx;
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/* The encryption operation will require a bounce page. */
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ciphertext_page = alloc_bounce_page(ctx, gfp_flags);
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if (IS_ERR(ciphertext_page))
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goto errout;
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if (!(inode->i_sb->s_cop->flags & FS_CFLG_INPLACE_ENCRYPTION)) {
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/* The encryption operation will require a bounce page. */
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ciphertext_page = alloc_bounce_page(ctx, gfp_flags);
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if (IS_ERR(ciphertext_page))
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goto errout;
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}
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ctx->w.control_page = plaintext_page;
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err = do_page_crypto(inode, FS_ENCRYPT, plaintext_page->index,
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err = do_page_crypto(inode, FS_ENCRYPT, index,
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plaintext_page, ciphertext_page,
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plaintext_len, plaintext_offset,
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gfp_flags);
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if (err) {
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ciphertext_page = ERR_PTR(err);
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goto errout;
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}
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SetPagePrivate(ciphertext_page);
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set_page_private(ciphertext_page, (unsigned long)ctx);
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lock_page(ciphertext_page);
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if (!(inode->i_sb->s_cop->flags & FS_CFLG_INPLACE_ENCRYPTION)) {
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SetPagePrivate(ciphertext_page);
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set_page_private(ciphertext_page, (unsigned long)ctx);
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lock_page(ciphertext_page);
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}
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return ciphertext_page;
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errout:
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@ -265,8 +280,12 @@ errout:
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EXPORT_SYMBOL(fscrypt_encrypt_page);
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/**
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* f2crypt_decrypt_page() - Decrypts a page in-place
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* @page: The page to decrypt. Must be locked.
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* fscrypt_decrypt_page() - Decrypts a page in-place
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* @inode: Encrypted inode to decrypt.
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* @page: The page to decrypt. Must be locked.
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* @len: Number of bytes in @page to be decrypted.
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* @offs: Start of data in @page.
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* @index: Index for encryption.
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*
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* Decrypts page in-place using the ctx encryption context.
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*
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@ -274,16 +293,15 @@ EXPORT_SYMBOL(fscrypt_encrypt_page);
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*
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* Return: Zero on success, non-zero otherwise.
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*/
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int fscrypt_decrypt_page(struct page *page)
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int fscrypt_decrypt_page(const struct inode *inode, struct page *page,
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unsigned int len, unsigned int offs, pgoff_t index)
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{
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BUG_ON(!PageLocked(page));
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return do_page_crypto(page->mapping->host,
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FS_DECRYPT, page->index, page, page, GFP_NOFS);
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return do_page_crypto(inode, FS_DECRYPT, page->index, page, page, len, offs,
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GFP_NOFS);
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}
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EXPORT_SYMBOL(fscrypt_decrypt_page);
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int fscrypt_zeroout_range(struct inode *inode, pgoff_t lblk,
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int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,
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sector_t pblk, unsigned int len)
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{
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struct fscrypt_ctx *ctx;
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@ -306,7 +324,7 @@ int fscrypt_zeroout_range(struct inode *inode, pgoff_t lblk,
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while (len--) {
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err = do_page_crypto(inode, FS_ENCRYPT, lblk,
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ZERO_PAGE(0), ciphertext_page,
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GFP_NOFS);
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PAGE_SIZE, 0, GFP_NOFS);
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if (err)
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goto errout;
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@ -414,7 +432,8 @@ static void completion_pages(struct work_struct *work)
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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 = fscrypt_decrypt_page(page);
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int ret = fscrypt_decrypt_page(page->mapping->host, page,
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PAGE_SIZE, 0, page->index);
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if (ret) {
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WARN_ON_ONCE(1);
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@ -39,65 +39,54 @@ static void fname_crypt_complete(struct crypto_async_request *req, int res)
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static int fname_encrypt(struct inode *inode,
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const struct qstr *iname, struct fscrypt_str *oname)
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{
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u32 ciphertext_len;
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struct skcipher_request *req = NULL;
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DECLARE_FS_COMPLETION_RESULT(ecr);
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struct fscrypt_info *ci = inode->i_crypt_info;
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struct crypto_skcipher *tfm = ci->ci_ctfm;
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int res = 0;
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char iv[FS_CRYPTO_BLOCK_SIZE];
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struct scatterlist src_sg, dst_sg;
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struct scatterlist sg;
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int padding = 4 << (ci->ci_flags & FS_POLICY_FLAGS_PAD_MASK);
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char *workbuf, buf[32], *alloc_buf = NULL;
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unsigned lim;
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unsigned int lim;
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unsigned int cryptlen;
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lim = inode->i_sb->s_cop->max_namelen(inode);
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if (iname->len <= 0 || iname->len > lim)
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return -EIO;
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ciphertext_len = max(iname->len, (u32)FS_CRYPTO_BLOCK_SIZE);
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ciphertext_len = round_up(ciphertext_len, padding);
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ciphertext_len = min(ciphertext_len, lim);
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/*
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* Copy the filename to the output buffer for encrypting in-place and
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* pad it with the needed number of NUL bytes.
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*/
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cryptlen = max_t(unsigned int, iname->len, FS_CRYPTO_BLOCK_SIZE);
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cryptlen = round_up(cryptlen, padding);
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cryptlen = min(cryptlen, lim);
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memcpy(oname->name, iname->name, iname->len);
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memset(oname->name + iname->len, 0, cryptlen - iname->len);
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if (ciphertext_len <= sizeof(buf)) {
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workbuf = buf;
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} else {
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alloc_buf = kmalloc(ciphertext_len, GFP_NOFS);
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if (!alloc_buf)
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return -ENOMEM;
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workbuf = alloc_buf;
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}
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/* Initialize the IV */
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memset(iv, 0, FS_CRYPTO_BLOCK_SIZE);
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/* Allocate request */
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/* Set up the encryption request */
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req = skcipher_request_alloc(tfm, GFP_NOFS);
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if (!req) {
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printk_ratelimited(KERN_ERR
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"%s: crypto_request_alloc() failed\n", __func__);
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kfree(alloc_buf);
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"%s: skcipher_request_alloc() failed\n", __func__);
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return -ENOMEM;
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}
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skcipher_request_set_callback(req,
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CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
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fname_crypt_complete, &ecr);
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sg_init_one(&sg, oname->name, cryptlen);
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skcipher_request_set_crypt(req, &sg, &sg, cryptlen, iv);
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/* Copy the input */
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memcpy(workbuf, iname->name, iname->len);
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if (iname->len < ciphertext_len)
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memset(workbuf + iname->len, 0, ciphertext_len - iname->len);
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/* Initialize IV */
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memset(iv, 0, FS_CRYPTO_BLOCK_SIZE);
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/* Create encryption request */
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sg_init_one(&src_sg, workbuf, ciphertext_len);
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sg_init_one(&dst_sg, oname->name, ciphertext_len);
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skcipher_request_set_crypt(req, &src_sg, &dst_sg, ciphertext_len, iv);
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/* Do the encryption */
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res = crypto_skcipher_encrypt(req);
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if (res == -EINPROGRESS || res == -EBUSY) {
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/* Request is being completed asynchronously; wait for it */
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wait_for_completion(&ecr.completion);
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res = ecr.res;
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}
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kfree(alloc_buf);
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skcipher_request_free(req);
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if (res < 0) {
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printk_ratelimited(KERN_ERR
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@ -105,7 +94,7 @@ static int fname_encrypt(struct inode *inode,
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return res;
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}
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oname->len = ciphertext_len;
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oname->len = cryptlen;
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return 0;
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}
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@ -220,7 +209,7 @@ static int digest_decode(const char *src, int len, char *dst)
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return cp - dst;
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}
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u32 fscrypt_fname_encrypted_size(struct inode *inode, u32 ilen)
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u32 fscrypt_fname_encrypted_size(const struct inode *inode, u32 ilen)
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{
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int padding = 32;
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struct fscrypt_info *ci = inode->i_crypt_info;
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@ -238,7 +227,7 @@ EXPORT_SYMBOL(fscrypt_fname_encrypted_size);
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* Allocates an output buffer that is sufficient for the crypto operation
|
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* specified by the context and the direction.
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*/
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int fscrypt_fname_alloc_buffer(struct inode *inode,
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int fscrypt_fname_alloc_buffer(const struct inode *inode,
|
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u32 ilen, struct fscrypt_str *crypto_str)
|
||||
{
|
||||
unsigned int olen = fscrypt_fname_encrypted_size(inode, ilen);
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|
@ -185,7 +185,7 @@ int get_crypt_info(struct inode *inode)
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||||
struct crypto_skcipher *ctfm;
|
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const char *cipher_str;
|
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int keysize;
|
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u8 raw_key[FS_MAX_KEY_SIZE];
|
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u8 *raw_key = NULL;
|
||||
int res;
|
||||
|
||||
res = fscrypt_initialize();
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@ -238,6 +238,15 @@ retry:
|
||||
if (res)
|
||||
goto out;
|
||||
|
||||
/*
|
||||
* This cannot be a stack buffer because it is passed to the scatterlist
|
||||
* crypto API as part of key derivation.
|
||||
*/
|
||||
res = -ENOMEM;
|
||||
raw_key = kmalloc(FS_MAX_KEY_SIZE, GFP_NOFS);
|
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if (!raw_key)
|
||||
goto out;
|
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|
||||
if (fscrypt_dummy_context_enabled(inode)) {
|
||||
memset(raw_key, 0x42, FS_AES_256_XTS_KEY_SIZE);
|
||||
goto got_key;
|
||||
@ -276,7 +285,8 @@ got_key:
|
||||
if (res)
|
||||
goto out;
|
||||
|
||||
memzero_explicit(raw_key, sizeof(raw_key));
|
||||
kzfree(raw_key);
|
||||
raw_key = NULL;
|
||||
if (cmpxchg(&inode->i_crypt_info, NULL, crypt_info) != NULL) {
|
||||
put_crypt_info(crypt_info);
|
||||
goto retry;
|
||||
@ -287,7 +297,7 @@ out:
|
||||
if (res == -ENOKEY)
|
||||
res = 0;
|
||||
put_crypt_info(crypt_info);
|
||||
memzero_explicit(raw_key, sizeof(raw_key));
|
||||
kzfree(raw_key);
|
||||
return res;
|
||||
}
|
||||
|
||||
|
@ -1169,7 +1169,8 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
|
||||
if (unlikely(err))
|
||||
page_zero_new_buffers(page, from, to);
|
||||
else if (decrypt)
|
||||
err = fscrypt_decrypt_page(page);
|
||||
err = fscrypt_decrypt_page(page->mapping->host, page,
|
||||
PAGE_SIZE, 0, page->index);
|
||||
return err;
|
||||
}
|
||||
#endif
|
||||
@ -3746,7 +3747,9 @@ static int __ext4_block_zero_page_range(handle_t *handle,
|
||||
/* We expect the key to be set. */
|
||||
BUG_ON(!fscrypt_has_encryption_key(inode));
|
||||
BUG_ON(blocksize != PAGE_SIZE);
|
||||
WARN_ON_ONCE(fscrypt_decrypt_page(page));
|
||||
BUG_ON(!PageLocked(page));
|
||||
WARN_ON_ONCE(fscrypt_decrypt_page(page->mapping->host,
|
||||
page, PAGE_SIZE, 0, page->index));
|
||||
}
|
||||
}
|
||||
if (ext4_should_journal_data(inode)) {
|
||||
|
@ -470,7 +470,8 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
|
||||
gfp_t gfp_flags = GFP_NOFS;
|
||||
|
||||
retry_encrypt:
|
||||
data_page = fscrypt_encrypt_page(inode, page, gfp_flags);
|
||||
data_page = fscrypt_encrypt_page(inode, page, PAGE_SIZE, 0,
|
||||
page->index, gfp_flags);
|
||||
if (IS_ERR(data_page)) {
|
||||
ret = PTR_ERR(data_page);
|
||||
if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) {
|
||||
|
@ -1194,8 +1194,11 @@ int do_write_data_page(struct f2fs_io_info *fio)
|
||||
f2fs_wait_on_encrypted_page_writeback(F2FS_I_SB(inode),
|
||||
fio->old_blkaddr);
|
||||
retry_encrypt:
|
||||
BUG_ON(!PageLocked(fio->page));
|
||||
fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page,
|
||||
gfp_flags);
|
||||
PAGE_SIZE, 0,
|
||||
fio->page->index,
|
||||
gfp_flags);
|
||||
if (IS_ERR(fio->encrypted_page)) {
|
||||
err = PTR_ERR(fio->encrypted_page);
|
||||
if (err == -ENOMEM) {
|
||||
|
@ -153,10 +153,16 @@ struct fscrypt_name {
|
||||
#define fname_name(p) ((p)->disk_name.name)
|
||||
#define fname_len(p) ((p)->disk_name.len)
|
||||
|
||||
/*
|
||||
* fscrypt superblock flags
|
||||
*/
|
||||
#define FS_CFLG_INPLACE_ENCRYPTION (1U << 1)
|
||||
|
||||
/*
|
||||
* crypto opertions for filesystems
|
||||
*/
|
||||
struct fscrypt_operations {
|
||||
unsigned int flags;
|
||||
int (*get_context)(struct inode *, void *, size_t);
|
||||
int (*key_prefix)(struct inode *, u8 **);
|
||||
int (*prepare_context)(struct inode *);
|
||||
@ -206,7 +212,7 @@ static inline struct page *fscrypt_control_page(struct page *page)
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline int fscrypt_has_encryption_key(struct inode *inode)
|
||||
static inline int fscrypt_has_encryption_key(const struct inode *inode)
|
||||
{
|
||||
#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
|
||||
return (inode->i_crypt_info != NULL);
|
||||
@ -240,14 +246,17 @@ static inline void fscrypt_set_d_op(struct dentry *dentry)
|
||||
extern struct kmem_cache *fscrypt_info_cachep;
|
||||
int fscrypt_initialize(void);
|
||||
|
||||
extern struct fscrypt_ctx *fscrypt_get_ctx(struct inode *, gfp_t);
|
||||
extern struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *, gfp_t);
|
||||
extern void fscrypt_release_ctx(struct fscrypt_ctx *);
|
||||
extern struct page *fscrypt_encrypt_page(struct inode *, struct page *, gfp_t);
|
||||
extern int fscrypt_decrypt_page(struct page *);
|
||||
extern struct page *fscrypt_encrypt_page(const struct inode *, struct page *,
|
||||
unsigned int, unsigned int,
|
||||
pgoff_t, gfp_t);
|
||||
extern int fscrypt_decrypt_page(const struct inode *, struct page *, unsigned int,
|
||||
unsigned int, pgoff_t);
|
||||
extern void fscrypt_decrypt_bio_pages(struct fscrypt_ctx *, struct bio *);
|
||||
extern void fscrypt_pullback_bio_page(struct page **, bool);
|
||||
extern void fscrypt_restore_control_page(struct page *);
|
||||
extern int fscrypt_zeroout_range(struct inode *, pgoff_t, sector_t,
|
||||
extern int fscrypt_zeroout_range(const struct inode *, pgoff_t, sector_t,
|
||||
unsigned int);
|
||||
/* policy.c */
|
||||
extern int fscrypt_process_policy(struct file *, const struct fscrypt_policy *);
|
||||
@ -264,8 +273,8 @@ extern void fscrypt_put_encryption_info(struct inode *, struct fscrypt_info *);
|
||||
extern int fscrypt_setup_filename(struct inode *, const struct qstr *,
|
||||
int lookup, struct fscrypt_name *);
|
||||
extern void fscrypt_free_filename(struct fscrypt_name *);
|
||||
extern u32 fscrypt_fname_encrypted_size(struct inode *, u32);
|
||||
extern int fscrypt_fname_alloc_buffer(struct inode *, u32,
|
||||
extern u32 fscrypt_fname_encrypted_size(const struct inode *, u32);
|
||||
extern int fscrypt_fname_alloc_buffer(const struct inode *, u32,
|
||||
struct fscrypt_str *);
|
||||
extern void fscrypt_fname_free_buffer(struct fscrypt_str *);
|
||||
extern int fscrypt_fname_disk_to_usr(struct inode *, u32, u32,
|
||||
@ -275,7 +284,7 @@ extern int fscrypt_fname_usr_to_disk(struct inode *, const struct qstr *,
|
||||
#endif
|
||||
|
||||
/* crypto.c */
|
||||
static inline struct fscrypt_ctx *fscrypt_notsupp_get_ctx(struct inode *i,
|
||||
static inline struct fscrypt_ctx *fscrypt_notsupp_get_ctx(const struct inode *i,
|
||||
gfp_t f)
|
||||
{
|
||||
return ERR_PTR(-EOPNOTSUPP);
|
||||
@ -286,13 +295,18 @@ static inline void fscrypt_notsupp_release_ctx(struct fscrypt_ctx *c)
|
||||
return;
|
||||
}
|
||||
|
||||
static inline struct page *fscrypt_notsupp_encrypt_page(struct inode *i,
|
||||
struct page *p, gfp_t f)
|
||||
static inline struct page *fscrypt_notsupp_encrypt_page(const struct inode *i,
|
||||
struct page *p,
|
||||
unsigned int len,
|
||||
unsigned int offs,
|
||||
pgoff_t index, gfp_t f)
|
||||
{
|
||||
return ERR_PTR(-EOPNOTSUPP);
|
||||
}
|
||||
|
||||
static inline int fscrypt_notsupp_decrypt_page(struct page *p)
|
||||
static inline int fscrypt_notsupp_decrypt_page(const struct inode *i, struct page *p,
|
||||
unsigned int len, unsigned int offs,
|
||||
pgoff_t index)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
@ -313,7 +327,7 @@ static inline void fscrypt_notsupp_restore_control_page(struct page *p)
|
||||
return;
|
||||
}
|
||||
|
||||
static inline int fscrypt_notsupp_zeroout_range(struct inode *i, pgoff_t p,
|
||||
static inline int fscrypt_notsupp_zeroout_range(const struct inode *i, pgoff_t p,
|
||||
sector_t s, unsigned int f)
|
||||
{
|
||||
return -EOPNOTSUPP;
|
||||
|
Loading…
Reference in New Issue
Block a user