From patchwork Mon Jan 16 23:09:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 643158 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4EC41C54EBE for ; Mon, 16 Jan 2023 23:13:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232556AbjAPXNG (ORCPT ); Mon, 16 Jan 2023 18:13:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235231AbjAPXMX (ORCPT ); Mon, 16 Jan 2023 18:12:23 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 49C212DE60 for ; Mon, 16 Jan 2023 15:09:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673910595; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kKmnjesqbVcK16NFYaezZHmG2fXFwkY2y+msB04GC+4=; b=Z/8SVx1qAcsdObodU2fqL0sCPCcY/w0Lb6UICxRC7SMdMUlqUPustAwmFdGS43APt/7CQo k71V9nbS0G1Gyc6pLUgDToRfeoCRXNTIQDjEd+zS3lO89HDZWjno7q8yADJ5BcUoN5Wr18 pArK+OGo6rtGQtu/K2vxK4vQYRrN/mA= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-523-Dg-7CkFxNXKEqeYPM6L_Fg-1; Mon, 16 Jan 2023 18:09:52 -0500 X-MC-Unique: Dg-7CkFxNXKEqeYPM6L_Fg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7ADA62A59560; Mon, 16 Jan 2023 23:09:51 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id 181692026D4B; Mon, 16 Jan 2023 23:09:50 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH v6 15/34] af_alg: Pin pages rather than ref'ing if appropriate From: David Howells To: Al Viro Cc: Herbert Xu , linux-crypto@vger.kernel.org, dhowells@redhat.com, Christoph Hellwig , Matthew Wilcox , Jens Axboe , Jan Kara , Jeff Layton , Logan Gunthorpe , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 16 Jan 2023 23:09:49 +0000 Message-ID: <167391058954.2311931.2012230616335750882.stgit@warthog.procyon.org.uk> In-Reply-To: <167391047703.2311931.8115712773222260073.stgit@warthog.procyon.org.uk> References: <167391047703.2311931.8115712773222260073.stgit@warthog.procyon.org.uk> User-Agent: StGit/1.5 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Convert AF_ALG to use iov_iter_extract_pages() instead of iov_iter_get_pages(). This will pin pages or leave them unaltered rather than getting a ref on them as appropriate to the iterator. The pages need to be pinned for DIO-read rather than having refs taken on them to prevent VM copy-on-write from malfunctioning during a concurrent fork() (the result of the I/O would otherwise end up only visible to the child process and not the parent). Signed-off-by: David Howells cc: Herbert Xu cc: linux-crypto@vger.kernel.org --- crypto/af_alg.c | 9 ++++++--- include/crypto/if_alg.h | 1 + 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 7a68db157fae..c99e09fce71f 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -534,15 +534,18 @@ static const struct net_proto_family alg_family = { int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len, unsigned int gup_flags) { + struct page **pages = sgl->pages; size_t off; ssize_t n; int npages, i; - n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off, - gup_flags); + n = iov_iter_extract_pages(iter, &pages, len, ALG_MAX_PAGES, + gup_flags, &off); if (n < 0) return n; + sgl->cleanup_mode = iov_iter_extract_mode(iter, gup_flags); + npages = DIV_ROUND_UP(off + n, PAGE_SIZE); if (WARN_ON(npages == 0)) return -EINVAL; @@ -576,7 +579,7 @@ void af_alg_free_sg(struct af_alg_sgl *sgl) int i; for (i = 0; i < sgl->npages; i++) - put_page(sgl->pages[i]); + page_put_unpin(sgl->pages[i], sgl->cleanup_mode); } EXPORT_SYMBOL_GPL(af_alg_free_sg); diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h index 12058ab6cad9..95b3b7517d3f 100644 --- a/include/crypto/if_alg.h +++ b/include/crypto/if_alg.h @@ -61,6 +61,7 @@ struct af_alg_sgl { struct scatterlist sg[ALG_MAX_PAGES + 1]; struct page *pages[ALG_MAX_PAGES]; unsigned int npages; + unsigned int cleanup_mode; }; /* TX SGL entry */ From patchwork Mon Jan 16 23:09:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 643546 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E69DC54EBE for ; Mon, 16 Jan 2023 23:13:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233990AbjAPXNq (ORCPT ); Mon, 16 Jan 2023 18:13:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235341AbjAPXM6 (ORCPT ); Mon, 16 Jan 2023 18:12:58 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F6AD2E0C0 for ; Mon, 16 Jan 2023 15:10:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673910602; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PjIAiip7N5L8hcYwP5P+y/gD9B8I5Bbt/wX0DBUObE8=; b=N59+z+xY7qP/C/MArMLAu2H7p7qhw7/tyegWONMOh+OJEI3uFWk6Un6YqPqeLp5rAjc41F Tv3IaMppPYFKcZ160Q41neShDjOPp2CfVsulexY2H+M7a/ValD+nHXjr6UdMqDboML31Kx zNw3747Hj/iYMFCRcwWzatuvr+ITM94= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-464-BpfiqjMTNrS7NCWxGctuPg-1; Mon, 16 Jan 2023 18:09:59 -0500 X-MC-Unique: BpfiqjMTNrS7NCWxGctuPg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A3942101AA78; Mon, 16 Jan 2023 23:09:58 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2E19E2166B26; Mon, 16 Jan 2023 23:09:57 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH v6 16/34] af_alg: [RFC] Use netfs_extract_iter_to_sg() to create scatterlists From: David Howells To: Al Viro Cc: Herbert Xu , linux-crypto@vger.kernel.org, dhowells@redhat.com, Christoph Hellwig , Matthew Wilcox , Jens Axboe , Jan Kara , Jeff Layton , Logan Gunthorpe , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 16 Jan 2023 23:09:56 +0000 Message-ID: <167391059663.2311931.12037449511418464282.stgit@warthog.procyon.org.uk> In-Reply-To: <167391047703.2311931.8115712773222260073.stgit@warthog.procyon.org.uk> References: <167391047703.2311931.8115712773222260073.stgit@warthog.procyon.org.uk> User-Agent: StGit/1.5 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Use netfs_extract_iter_to_sg() to decant the destination iterator into a scatterlist in af_alg_get_rsgl(). af_alg_make_sg() can then be removed. Note that if this fits, netfs_extract_iter_to_sg() should move to core code. Signed-off-by: David Howells cc: Herbert Xu cc: linux-crypto@vger.kernel.org --- crypto/af_alg.c | 63 +++++++++++++---------------------------------- crypto/algif_hash.c | 21 +++++++++++----- include/crypto/if_alg.h | 7 +---- 3 files changed, 35 insertions(+), 56 deletions(-) diff --git a/crypto/af_alg.c b/crypto/af_alg.c index c99e09fce71f..c5fbe39366ff 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -531,55 +532,22 @@ static const struct net_proto_family alg_family = { .owner = THIS_MODULE, }; -int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len, - unsigned int gup_flags) -{ - struct page **pages = sgl->pages; - size_t off; - ssize_t n; - int npages, i; - - n = iov_iter_extract_pages(iter, &pages, len, ALG_MAX_PAGES, - gup_flags, &off); - if (n < 0) - return n; - - sgl->cleanup_mode = iov_iter_extract_mode(iter, gup_flags); - - npages = DIV_ROUND_UP(off + n, PAGE_SIZE); - if (WARN_ON(npages == 0)) - return -EINVAL; - /* Add one extra for linking */ - sg_init_table(sgl->sg, npages + 1); - - for (i = 0, len = n; i < npages; i++) { - int plen = min_t(int, len, PAGE_SIZE - off); - - sg_set_page(sgl->sg + i, sgl->pages[i], plen, off); - - off = 0; - len -= plen; - } - sg_mark_end(sgl->sg + npages - 1); - sgl->npages = npages; - - return n; -} -EXPORT_SYMBOL_GPL(af_alg_make_sg); - static void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new) { - sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1); - sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg); + sg_unmark_end(sgl_prev->sgt.sgl + sgl_prev->sgt.nents - 1); + sg_chain(sgl_prev->sgt.sgl, sgl_prev->sgt.nents + 1, sgl_new->sgt.sgl); } void af_alg_free_sg(struct af_alg_sgl *sgl) { int i; - for (i = 0; i < sgl->npages; i++) - page_put_unpin(sgl->pages[i], sgl->cleanup_mode); + if (!(sgl->cleanup_mode & (FOLL_PIN | FOLL_GET))) + return; + + for (i = 0; i < sgl->sgt.nents; i++) + page_put_unpin(sg_page(&sgl->sgt.sgl[i]), sgl->cleanup_mode); } EXPORT_SYMBOL_GPL(af_alg_free_sg); @@ -1293,8 +1261,8 @@ int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, while (maxsize > len && msg_data_left(msg)) { struct af_alg_rsgl *rsgl; + ssize_t err; size_t seglen; - int err; /* limit the amount of readable buffers */ if (!af_alg_readable(sk)) @@ -1311,17 +1279,22 @@ int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, return -ENOMEM; } - rsgl->sgl.npages = 0; + rsgl->sgl.sgt.sgl = rsgl->sgl.sgl; + rsgl->sgl.sgt.nents = 0; + rsgl->sgl.sgt.orig_nents = 0; list_add_tail(&rsgl->list, &areq->rsgl_list); - /* make one iovec available as scatterlist */ - err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen, - FOLL_DEST_BUF); + err = netfs_extract_iter_to_sg(&msg->msg_iter, seglen, + &rsgl->sgl.sgt, ALG_MAX_PAGES, + FOLL_DEST_BUF); if (err < 0) { rsgl->sg_num_bytes = 0; return err; } + rsgl->sgl.cleanup_mode = iov_iter_extract_mode(&msg->msg_iter, + FOLL_DEST_BUF); + /* chain the new scatterlist with previous one */ if (areq->last_rsgl) af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl); diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c index fe3d2258145f..5aef6818a9ff 100644 --- a/crypto/algif_hash.c +++ b/crypto/algif_hash.c @@ -14,6 +14,7 @@ #include #include #include +#include #include struct hash_ctx { @@ -91,14 +92,22 @@ static int hash_sendmsg(struct socket *sock, struct msghdr *msg, if (len > limit) len = limit; - len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len, - FOLL_SOURCE_BUF); + ctx->sgl.sgt.sgl = ctx->sgl.sgl; + ctx->sgl.sgt.nents = 0; + ctx->sgl.sgt.orig_nents = 0; + + len = netfs_extract_iter_to_sg(&msg->msg_iter, len, + &ctx->sgl.sgt, ALG_MAX_PAGES, + FOLL_SOURCE_BUF); if (len < 0) { err = copied ? 0 : len; goto unlock; } - ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len); + ctx->sgl.cleanup_mode = iov_iter_extract_mode(&msg->msg_iter, + FOLL_SOURCE_BUF); + + ahash_request_set_crypt(&ctx->req, ctx->sgl.sgt.sgl, NULL, len); err = crypto_wait_req(crypto_ahash_update(&ctx->req), &ctx->wait); @@ -142,8 +151,8 @@ static ssize_t hash_sendpage(struct socket *sock, struct page *page, flags |= MSG_MORE; lock_sock(sk); - sg_init_table(ctx->sgl.sg, 1); - sg_set_page(ctx->sgl.sg, page, size, offset); + sg_init_table(ctx->sgl.sgl, 1); + sg_set_page(ctx->sgl.sgl, page, size, offset); if (!(flags & MSG_MORE)) { err = hash_alloc_result(sk, ctx); @@ -152,7 +161,7 @@ static ssize_t hash_sendpage(struct socket *sock, struct page *page, } else if (!ctx->more) hash_free_result(sk, ctx); - ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size); + ahash_request_set_crypt(&ctx->req, ctx->sgl.sgl, ctx->result, size); if (!(flags & MSG_MORE)) { if (ctx->more) diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h index 95b3b7517d3f..424a2071705d 100644 --- a/include/crypto/if_alg.h +++ b/include/crypto/if_alg.h @@ -58,9 +58,8 @@ struct af_alg_type { }; struct af_alg_sgl { - struct scatterlist sg[ALG_MAX_PAGES + 1]; - struct page *pages[ALG_MAX_PAGES]; - unsigned int npages; + struct sg_table sgt; + struct scatterlist sgl[ALG_MAX_PAGES + 1]; unsigned int cleanup_mode; }; @@ -166,8 +165,6 @@ int af_alg_release(struct socket *sock); void af_alg_release_parent(struct sock *sk); int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern); -int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len, - unsigned int gup_flags); void af_alg_free_sg(struct af_alg_sgl *sgl); static inline struct alg_sock *alg_sk(struct sock *sk) From patchwork Mon Jan 16 23:11:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 643157 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B539C54EBE for ; Mon, 16 Jan 2023 23:17:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235424AbjAPXRa (ORCPT ); Mon, 16 Jan 2023 18:17:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234347AbjAPXQm (ORCPT ); Mon, 16 Jan 2023 18:16:42 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0BFC3303C8 for ; Mon, 16 Jan 2023 15:11:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673910668; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mkjFMRxDIKJKWLRwMUOLvuSiSTpWYy2LHznevDgStcI=; b=XI891kVwNi0AtoP/FveHt030d447W0SmZ5GXiRQAqBCfTq4vNJTvX5vj+DNPzytU+uotSW Pg6e/y1Pmr069JFr+HELtJbcPK65ruuqiBkUT+kdiJ2cDadLdK/VlgNZbHyC3nYtwhxHgu mV5XjbitGcmStHegq1R+G44jaKarpMc= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-203-enKb_4ZtORmXcmB3l_IJKw-1; Mon, 16 Jan 2023 18:11:05 -0500 X-MC-Unique: enKb_4ZtORmXcmB3l_IJKw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 710612A59560; Mon, 16 Jan 2023 23:11:04 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id A58A94010D46; Mon, 16 Jan 2023 23:11:02 +0000 (UTC) Organization: Red Hat UK Ltd. 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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH v6 25/34] cifs: Add a function to Hash the contents of an iterator From: David Howells To: Al Viro Cc: Steve French , Shyam Prasad N , Rohith Surabattula , Jeff Layton , linux-cifs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-crypto@vger.kernel.org, dhowells@redhat.com, Christoph Hellwig , Matthew Wilcox , Jens Axboe , Jan Kara , Jeff Layton , Logan Gunthorpe , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 16 Jan 2023 23:11:02 +0000 Message-ID: <167391066212.2311931.16097548940184155209.stgit@warthog.procyon.org.uk> In-Reply-To: <167391047703.2311931.8115712773222260073.stgit@warthog.procyon.org.uk> References: <167391047703.2311931.8115712773222260073.stgit@warthog.procyon.org.uk> User-Agent: StGit/1.5 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org Add a function to push the contents of a BVEC-, KVEC- or XARRAY-type iterator into a symmetric hash algorithm. UBUF- and IOBUF-type iterators are not supported on the assumption that either we're doing buffered I/O, in which case we won't see them, or we're doing direct I/O, in which case the iterator will have been extracted into a BVEC-type iterator higher up. Signed-off-by: David Howells cc: Steve French cc: Shyam Prasad N cc: Rohith Surabattula cc: Jeff Layton cc: linux-cifs@vger.kernel.org cc: linux-fsdevel@vger.kernel.org cc: linux-crypto@vger.kernel.org Link: https://lore.kernel.org/r/166697257423.61150.12070648579830206483.stgit@warthog.procyon.org.uk/ # rfc Link: https://lore.kernel.org/r/166732029577.3186319.17162612653237909961.stgit@warthog.procyon.org.uk/ # rfc --- fs/cifs/cifsencrypt.c | 144 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c index 5db73c0f792a..e13f26371540 100644 --- a/fs/cifs/cifsencrypt.c +++ b/fs/cifs/cifsencrypt.c @@ -24,6 +24,150 @@ #include "../smbfs_common/arc4.h" #include +/* + * Hash data from a BVEC-type iterator. + */ +static int cifs_shash_bvec(const struct iov_iter *iter, ssize_t maxsize, + struct shash_desc *shash) +{ + const struct bio_vec *bv = iter->bvec; + unsigned long start = iter->iov_offset; + unsigned int i; + void *p; + int ret; + + for (i = 0; i < iter->nr_segs; i++) { + size_t off, len; + + len = bv[i].bv_len; + if (start >= len) { + start -= len; + continue; + } + + len = min_t(size_t, maxsize, len - start); + off = bv[i].bv_offset + start; + + p = kmap_local_page(bv[i].bv_page); + ret = crypto_shash_update(shash, p + off, len); + kunmap_local(p); + if (ret < 0) + return ret; + + maxsize -= len; + if (maxsize <= 0) + break; + start = 0; + } + + return 0; +} + +/* + * Hash data from a KVEC-type iterator. + */ +static int cifs_shash_kvec(const struct iov_iter *iter, ssize_t maxsize, + struct shash_desc *shash) +{ + const struct kvec *kv = iter->kvec; + unsigned long start = iter->iov_offset; + unsigned int i; + int ret; + + for (i = 0; i < iter->nr_segs; i++) { + size_t len; + + len = kv[i].iov_len; + if (start >= len) { + start -= len; + continue; + } + + len = min_t(size_t, maxsize, len - start); + ret = crypto_shash_update(shash, kv[i].iov_base + start, len); + if (ret < 0) + return ret; + maxsize -= len; + + if (maxsize <= 0) + break; + start = 0; + } + + return 0; +} + +/* + * Hash data from an XARRAY-type iterator. + */ +static ssize_t cifs_shash_xarray(const struct iov_iter *iter, ssize_t maxsize, + struct shash_desc *shash) +{ + struct folio *folios[16], *folio; + unsigned int nr, i, j, npages; + loff_t start = iter->xarray_start + iter->iov_offset; + pgoff_t last, index = start / PAGE_SIZE; + ssize_t ret = 0; + size_t len, offset, foffset; + void *p; + + if (maxsize == 0) + return 0; + + last = (start + maxsize - 1) / PAGE_SIZE; + do { + nr = xa_extract(iter->xarray, (void **)folios, index, last, + ARRAY_SIZE(folios), XA_PRESENT); + if (nr == 0) + return -EIO; + + for (i = 0; i < nr; i++) { + folio = folios[i]; + npages = folio_nr_pages(folio); + foffset = start - folio_pos(folio); + offset = foffset % PAGE_SIZE; + for (j = foffset / PAGE_SIZE; j < npages; j++) { + len = min_t(size_t, maxsize, PAGE_SIZE - offset); + p = kmap_local_page(folio_page(folio, j)); + ret = crypto_shash_update(shash, p, len); + kunmap_local(p); + if (ret < 0) + return ret; + maxsize -= len; + if (maxsize <= 0) + return 0; + start += len; + offset = 0; + index++; + } + } + } while (nr == ARRAY_SIZE(folios)); + return 0; +} + +/* + * Pass the data from an iterator into a hash. + */ +static int cifs_shash_iter(const struct iov_iter *iter, size_t maxsize, + struct shash_desc *shash) +{ + if (maxsize == 0) + return 0; + + switch (iov_iter_type(iter)) { + case ITER_BVEC: + return cifs_shash_bvec(iter, maxsize, shash); + case ITER_KVEC: + return cifs_shash_kvec(iter, maxsize, shash); + case ITER_XARRAY: + return cifs_shash_xarray(iter, maxsize, shash); + default: + pr_err("cifs_shash_iter(%u) unsupported\n", iov_iter_type(iter)); + WARN_ON_ONCE(1); + return -EIO; + } +} + int __cifs_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server, char *signature, struct shash_desc *shash)