From patchwork Thu Feb 14 00:01:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Khalid Aziz X-Patchwork-Id: 10811435 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0532713B4 for ; Thu, 14 Feb 2019 00:05:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E9DC62DCD3 for ; Thu, 14 Feb 2019 00:05:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DD7EF2DD6F; Thu, 14 Feb 2019 00:05:42 +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=-5.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 0C7262DCD3 for ; Thu, 14 Feb 2019 00:05:41 +0000 (UTC) Received: (qmail 30618 invoked by uid 550); 14 Feb 2019 00:05:12 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 30538 invoked from network); 14 Feb 2019 00:05:11 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : in-reply-to : references; s=corp-2018-07-02; bh=MZqi6ournax3KQmG8JyBwhw5kF/1WOYT8qIrSyRL3+o=; b=5c4qlL7951pylpPk/LYjHCqBaQh+OE07SNEncySbv9VpXjItDk191jRy8R2qAS/Si7wk 5azy3SAjL1y5ZU+ayiqvpGeYyYPej1QFoowA8i7hY6LnuqWwGRdVeXP9R8NT7EnzXbG6 VmTdJcDS8tsN+qApiiulm6FgWZxe8R1C9yy4gLDgnBMg2ET8uYg5u30QJc9jnecDxXLZ Ws9u2vhvaPb5ONbVL/qJNVAlo/vUy0Ks8iSwt4n7n8NmKRBZtbPL12yeMBe53Z6nM1Be It7bqaU0WEZ+yaRGwGM5y3xEn/ALsicHwZUxBoSgDXDN78jBld75C6noZszpY4wmUtbI 7A== From: Khalid Aziz To: juergh@gmail.com, tycho@tycho.ws, jsteckli@amazon.de, ak@linux.intel.com, torvalds@linux-foundation.org, liran.alon@oracle.com, keescook@google.com, akpm@linux-foundation.org, mhocko@suse.com, catalin.marinas@arm.com, will.deacon@arm.com, jmorris@namei.org, konrad.wilk@oracle.com Cc: Juerg Haefliger , deepa.srinivasan@oracle.com, chris.hyser@oracle.com, tyhicks@canonical.com, dwmw@amazon.co.uk, andrew.cooper3@citrix.com, jcm@redhat.com, boris.ostrovsky@oracle.com, kanth.ghatraju@oracle.com, oao.m.martins@oracle.com, jmattson@google.com, pradeep.vincent@oracle.com, john.haxby@oracle.com, tglx@linutronix.de, kirill.shutemov@linux.intel.com, hch@lst.de, steven.sistare@oracle.com, labbott@redhat.com, luto@kernel.org, dave.hansen@intel.com, peterz@infradead.org, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Tycho Andersen Subject: [RFC PATCH v8 04/14] swiotlb: Map the buffer if it was unmapped by XPFO Date: Wed, 13 Feb 2019 17:01:27 -0700 Message-Id: X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9166 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=845 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902130157 X-Virus-Scanned: ClamAV using ClamSMTP From: Juerg Haefliger v6: * guard against lookup_xpfo() returning NULL CC: Konrad Rzeszutek Wilk Signed-off-by: Juerg Haefliger Signed-off-by: Tycho Andersen Reviewed-by: Khalid Aziz Reviewed-by: Konrad Rzeszutek Wilk --- include/linux/xpfo.h | 4 ++++ kernel/dma/swiotlb.c | 3 ++- mm/xpfo.c | 15 +++++++++++++++ 3 files changed, 21 insertions(+), 1 deletion(-) diff --git a/include/linux/xpfo.h b/include/linux/xpfo.h index b15234745fb4..cba37ffb09b1 100644 --- a/include/linux/xpfo.h +++ b/include/linux/xpfo.h @@ -36,6 +36,8 @@ void xpfo_kunmap(void *kaddr, struct page *page); void xpfo_alloc_pages(struct page *page, int order, gfp_t gfp); void xpfo_free_pages(struct page *page, int order); +bool xpfo_page_is_unmapped(struct page *page); + #else /* !CONFIG_XPFO */ static inline void xpfo_kmap(void *kaddr, struct page *page) { } @@ -43,6 +45,8 @@ static inline void xpfo_kunmap(void *kaddr, struct page *page) { } static inline void xpfo_alloc_pages(struct page *page, int order, gfp_t gfp) { } static inline void xpfo_free_pages(struct page *page, int order) { } +static inline bool xpfo_page_is_unmapped(struct page *page) { return false; } + #endif /* CONFIG_XPFO */ #endif /* _LINUX_XPFO_H */ diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 045930e32c0e..820a54b57491 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -396,8 +396,9 @@ static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr, { unsigned long pfn = PFN_DOWN(orig_addr); unsigned char *vaddr = phys_to_virt(tlb_addr); + struct page *page = pfn_to_page(pfn); - if (PageHighMem(pfn_to_page(pfn))) { + if (PageHighMem(page) || xpfo_page_is_unmapped(page)) { /* The buffer does not have a mapping. Map it in and copy */ unsigned int offset = orig_addr & ~PAGE_MASK; char *buffer; diff --git a/mm/xpfo.c b/mm/xpfo.c index 24b33d3c20cb..67884736bebe 100644 --- a/mm/xpfo.c +++ b/mm/xpfo.c @@ -221,3 +221,18 @@ void xpfo_kunmap(void *kaddr, struct page *page) spin_unlock(&xpfo->maplock); } EXPORT_SYMBOL(xpfo_kunmap); + +bool xpfo_page_is_unmapped(struct page *page) +{ + struct xpfo *xpfo; + + if (!static_branch_unlikely(&xpfo_inited)) + return false; + + xpfo = lookup_xpfo(page); + if (unlikely(!xpfo) && !xpfo->inited) + return false; + + return test_bit(XPFO_PAGE_UNMAPPED, &xpfo->flags); +} +EXPORT_SYMBOL(xpfo_page_is_unmapped);