From patchwork Sun Nov 13 21:20:46 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Weinberger X-Patchwork-Id: 9425041 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EA43D6047D for ; Sun, 13 Nov 2016 21:29:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D959128908 for ; Sun, 13 Nov 2016 21:29:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CD6A82890C; Sun, 13 Nov 2016 21:29:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0062A28908 for ; Sun, 13 Nov 2016 21:29:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935021AbcKMV3g (ORCPT ); Sun, 13 Nov 2016 16:29:36 -0500 Received: from mail.sigma-star.at ([95.130.255.111]:45999 "EHLO mail.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935074AbcKMVVy (ORCPT ); Sun, 13 Nov 2016 16:21:54 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.sigma-star.at (Postfix) with ESMTP id 938EB24E0005; Sun, 13 Nov 2016 22:21:50 +0100 (CET) Received: from linux.site (richard.vpn.sigmapriv.at [10.3.0.5]) by mail.sigma-star.at (Postfix) with ESMTPSA id 2AD9324E0006; Sun, 13 Nov 2016 22:21:49 +0100 (CET) From: Richard Weinberger To: linux-mtd@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, dedekind1@gmail.com, adrian.hunter@intel.com, tytso@mit.edu, jaegeuk@kernel.org, david@sigma-star.at, wd@denx.de, sbabic@denx.de, dengler@linutronix.de, ebiggers@google.com, mhalcrow@google.com, hch@infradead.org, Richard Weinberger Subject: [PATCH 03/29] fscrypt: Enable partial page encryption Date: Sun, 13 Nov 2016 22:20:46 +0100 Message-Id: <1479072072-6844-4-git-send-email-richard@nod.at> X-Mailer: git-send-email 2.7.3 In-Reply-To: <1479072072-6844-1-git-send-email-richard@nod.at> References: <1479072072-6844-1-git-send-email-richard@nod.at> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: David Gstir Not all filesystems work on full pages, thus we should allow them to hand partial pages to fscrypt for en/decryption. Signed-off-by: David Gstir Signed-off-by: Richard Weinberger --- fs/crypto/crypto.c | 42 ++++++++++++++++++++++++++---------------- fs/ext4/inode.c | 6 ++++-- fs/ext4/page-io.c | 2 +- fs/f2fs/data.c | 2 ++ include/linux/fscrypto.h | 16 +++++++++++----- 5 files changed, 44 insertions(+), 24 deletions(-) diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 222a70520565..e170aa05011d 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -149,6 +149,7 @@ typedef enum { static int do_page_crypto(struct inode *inode, fscrypt_direction_t rw, pgoff_t index, struct page *src_page, struct page *dest_page, + unsigned int src_len, unsigned int src_offset, gfp_t gfp_flags) { struct { @@ -179,10 +180,10 @@ static int do_page_crypto(struct inode *inode, memset(xts_tweak.padding, 0, sizeof(xts_tweak.padding)); sg_init_table(&dst, 1); - sg_set_page(&dst, dest_page, PAGE_SIZE, 0); + sg_set_page(&dst, dest_page, src_len, src_offset); 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); + sg_set_page(&src, src_page, src_len, src_offset); + skcipher_request_set_crypt(req, &src, &dst, src_len, &xts_tweak); if (rw == FS_DECRYPT) res = crypto_skcipher_decrypt(req); else @@ -213,9 +214,11 @@ static struct page *alloc_bounce_page(struct fscrypt_ctx *ctx, gfp_t gfp_flags) /** * fscypt_encrypt_page() - Encrypts a page - * @inode: The inode for which the encryption should take place - * @plaintext_page: The page to encrypt. Must be locked. - * @gfp_flags: The gfp flag for memory allocation + * @inode: The inode for which the encryption should take place + * @plaintext_page: The page to encrypt. Must be locked. + * @plaintext_len: Length of plaintext within page + * @plaintext_offset: Offset of plaintext within page + * @gfp_flags: The gfp flag for memory allocation * * Encrypts plaintext_page using the ctx encryption context. If * the filesystem supports it, encryption is performed in-place, otherwise a @@ -229,13 +232,17 @@ static struct page *alloc_bounce_page(struct fscrypt_ctx *ctx, gfp_t gfp_flags) * error value or NULL. */ struct page *fscrypt_encrypt_page(struct inode *inode, - struct page *plaintext_page, gfp_t gfp_flags) + struct page *plaintext_page, + unsigned int plaintext_len, + unsigned int plaintext_offset, + gfp_t gfp_flags) + { struct fscrypt_ctx *ctx; struct page *ciphertext_page = plaintext_page; int err; - BUG_ON(!PageLocked(plaintext_page)); + BUG_ON(plaintext_len % FS_CRYPTO_BLOCK_SIZE != 0); ctx = fscrypt_get_ctx(inode, gfp_flags); if (IS_ERR(ctx)) @@ -251,6 +258,7 @@ struct page *fscrypt_encrypt_page(struct inode *inode, ctx->w.control_page = plaintext_page; err = do_page_crypto(inode, FS_ENCRYPT, plaintext_page->index, plaintext_page, ciphertext_page, + plaintext_len, plaintext_offset, gfp_flags); if (err) { ciphertext_page = ERR_PTR(err); @@ -270,9 +278,11 @@ struct page *fscrypt_encrypt_page(struct inode *inode, EXPORT_SYMBOL(fscrypt_encrypt_page); /** - * f2crypt_decrypt_page() - Decrypts a page in-place - * @inode: The encrypted inode to decrypt. + * fscrypt_decrypt_page() - Decrypts a page in-place + * @inode: Encrypted inode to decrypt. * @page: The page to decrypt. Must be locked. + * @len: Number of bytes in @page to be decrypted. + * @offs: Start of data in @page. * * Decrypts page in-place using the ctx encryption context. * @@ -280,11 +290,10 @@ EXPORT_SYMBOL(fscrypt_encrypt_page); * * Return: Zero on success, non-zero otherwise. */ -int fscrypt_decrypt_page(struct inode *inode, struct page *page) +int fscrypt_decrypt_page(struct inode *inode, struct page *page, + unsigned int len, unsigned int offs) { - BUG_ON(!PageLocked(page)); - - return do_page_crypto(inode, FS_DECRYPT, page->index, page, page, + return do_page_crypto(inode, FS_DECRYPT, page->index, page, page, len, offs, GFP_NOFS); } EXPORT_SYMBOL(fscrypt_decrypt_page); @@ -312,7 +321,7 @@ int fscrypt_zeroout_range(struct inode *inode, pgoff_t lblk, while (len--) { err = do_page_crypto(inode, FS_ENCRYPT, lblk, ZERO_PAGE(0), ciphertext_page, - GFP_NOFS); + PAGE_SIZE, 0, GFP_NOFS); if (err) goto errout; @@ -420,7 +429,8 @@ static void completion_pages(struct work_struct *work) bio_for_each_segment_all(bv, bio, i) { struct page *page = bv->bv_page; - int ret = fscrypt_decrypt_page(page->mapping->host, page); + int ret = fscrypt_decrypt_page(page->mapping->host, page, + PAGE_SIZE, 0); if (ret) { WARN_ON_ONCE(1); diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 4b7b842ec024..1d498c5e2990 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1166,7 +1166,8 @@ 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->mapping->host, page); + err = fscrypt_decrypt_page(page->mapping->host, page, + PAGE_SIZE, 0); return err; } #endif @@ -3743,8 +3744,9 @@ 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); + BUG_ON(!PageLocked(page)); WARN_ON_ONCE(fscrypt_decrypt_page(page->mapping->host, - page)); + page, PAGE_SIZE, 0)); } } if (ext4_should_journal_data(inode)) { diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index 0094923e5ebf..3d1d3d0f4303 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -470,7 +470,7 @@ 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, gfp_flags); if (IS_ERR(data_page)) { ret = PTR_ERR(data_page); if (ret == -ENOMEM && wbc->sync_mode == WB_SYNC_ALL) { diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 9ae194fd2fdb..fac207254e8d 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1194,7 +1194,9 @@ 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, + PAGE_SIZE, 0, gfp_flags); if (IS_ERR(fio->encrypted_page)) { err = PTR_ERR(fio->encrypted_page); diff --git a/include/linux/fscrypto.h b/include/linux/fscrypto.h index 8be8e9657c63..e05931272cea 100644 --- a/include/linux/fscrypto.h +++ b/include/linux/fscrypto.h @@ -248,8 +248,11 @@ int fscrypt_initialize(void); extern struct fscrypt_ctx *fscrypt_get_ctx(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 inode *, struct page *); +extern struct page *fscrypt_encrypt_page(struct inode *, struct page *, + unsigned int, unsigned int, + gfp_t); +extern int fscrypt_decrypt_page(struct inode *, struct page *, unsigned int, + unsigned int); 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 *); @@ -293,13 +296,16 @@ static inline void fscrypt_notsupp_release_ctx(struct fscrypt_ctx *c) } static inline struct page *fscrypt_notsupp_encrypt_page(struct inode *i, - struct page *p, gfp_t f) + struct page *p, + unsigned int len, + unsigned int offs, + gfp_t f) { return ERR_PTR(-EOPNOTSUPP); } -static inline int fscrypt_notsupp_decrypt_page(struct inode *i, - struct page *p) +static inline int fscrypt_notsupp_decrypt_page(struct inode *i, struct page *p, + unsigned int len, unsigned int offs) { return -EOPNOTSUPP; }