From patchwork Tue Sep 27 08:18:59 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 12990302 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 27F6BC07E9D for ; Tue, 27 Sep 2022 10:06:08 +0000 (UTC) Received: from localhost ([::1]:55784 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1od5xj-0002eJ-RQ for qemu-devel@archiver.kernel.org; Tue, 27 Sep 2022 04:29:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54874) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1od5oQ-0005Os-7a for qemu-devel@nongnu.org; Tue, 27 Sep 2022 04:19:33 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:47931) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1od5oO-0000J8-G5 for qemu-devel@nongnu.org; Tue, 27 Sep 2022 04:19:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1664266767; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5nyN9zf4XTCE2tFR3Vt7TfVm0hv0qRla4YlTg9dQiCI=; b=a1n7qII9h/3dGdagKpCAsiwLcIMd6qSzEnRQW4eQL6+1oc/hpgWyddt/Q0/Snd642KKQCN awYKFQeowYxFY+lO7c8eletmqzXnAnW5jUib01ukvnPiPws9yBXa0JeIEp7TKs8+TmyIn2 j3fETCOGXH3kkrAhP9cdvDsPXPKuBks= 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-663-KSadr7CxNomHjU5Vjv264Q-1; Tue, 27 Sep 2022 04:19:24 -0400 X-MC-Unique: KSadr7CxNomHjU5Vjv264Q-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 235AA101A528; Tue, 27 Sep 2022 08:19:24 +0000 (UTC) Received: from sirius.home.kraxel.org (unknown [10.39.192.24]) by smtp.corp.redhat.com (Postfix) with ESMTPS id ABE532087440; Tue, 27 Sep 2022 08:19:23 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 7BB3A1800996; Tue, 27 Sep 2022 10:19:13 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Cc: Qiuhao Li , "Michael S. Tsirkin" , Stefan Hajnoczi , Eric Blake , Darren Kenny , Bandan Das , Alexander Bulekov , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Markus Armbruster , Akihiko Odaki , Alexandre Ratchov , Laurent Vivier , Paolo Bonzini , Thomas Huth , Gerd Hoffmann , Peter Maydell Subject: [PULL 11/24] hw/usb/hcd-xhci: Check whether DMA accesses fail Date: Tue, 27 Sep 2022 10:18:59 +0200 Message-Id: <20220927081912.180983-12-kraxel@redhat.com> In-Reply-To: <20220927081912.180983-1-kraxel@redhat.com> References: <20220927081912.180983-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Thomas Huth If a guest sets up bad descriptors, it could force QEMU to access non-existing memory regions. Thus we should check the return value of dma_memory_read/write() to make sure that these errors don't go unnoticed. Signed-off-by: Thomas Huth Message-Id: <20220817160016.49752-1-thuth@redhat.com> Signed-off-by: Gerd Hoffmann --- hw/usb/hcd-xhci.c | 64 +++++++++++++++++++++++++++++++++++------------ 1 file changed, 48 insertions(+), 16 deletions(-) diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c index 3c48b58ddeb5..acd60b1a4904 100644 --- a/hw/usb/hcd-xhci.c +++ b/hw/usb/hcd-xhci.c @@ -463,6 +463,12 @@ static void xhci_mfwrap_timer(void *opaque) xhci_mfwrap_update(xhci); } +static void xhci_die(XHCIState *xhci) +{ + xhci->usbsts |= USBSTS_HCE; + DPRINTF("xhci: asserted controller error\n"); +} + static inline dma_addr_t xhci_addr64(uint32_t low, uint32_t high) { if (sizeof(dma_addr_t) == 4) { @@ -488,7 +494,14 @@ static inline void xhci_dma_read_u32s(XHCIState *xhci, dma_addr_t addr, assert((len % sizeof(uint32_t)) == 0); - dma_memory_read(xhci->as, addr, buf, len, MEMTXATTRS_UNSPECIFIED); + if (dma_memory_read(xhci->as, addr, buf, len, + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA memory access failed!\n", + __func__); + memset(buf, 0xff, len); + xhci_die(xhci); + return; + } for (i = 0; i < (len / sizeof(uint32_t)); i++) { buf[i] = le32_to_cpu(buf[i]); @@ -496,7 +509,7 @@ static inline void xhci_dma_read_u32s(XHCIState *xhci, dma_addr_t addr, } static inline void xhci_dma_write_u32s(XHCIState *xhci, dma_addr_t addr, - uint32_t *buf, size_t len) + const uint32_t *buf, size_t len) { int i; uint32_t tmp[5]; @@ -508,7 +521,13 @@ static inline void xhci_dma_write_u32s(XHCIState *xhci, dma_addr_t addr, for (i = 0; i < n; i++) { tmp[i] = cpu_to_le32(buf[i]); } - dma_memory_write(xhci->as, addr, tmp, len, MEMTXATTRS_UNSPECIFIED); + if (dma_memory_write(xhci->as, addr, tmp, len, + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA memory access failed!\n", + __func__); + xhci_die(xhci); + return; + } } static XHCIPort *xhci_lookup_port(XHCIState *xhci, struct USBPort *uport) @@ -593,12 +612,6 @@ static inline int xhci_running(XHCIState *xhci) return !(xhci->usbsts & USBSTS_HCH); } -static void xhci_die(XHCIState *xhci) -{ - xhci->usbsts |= USBSTS_HCE; - DPRINTF("xhci: asserted controller error\n"); -} - static void xhci_write_event(XHCIState *xhci, XHCIEvent *event, int v) { XHCIInterrupter *intr = &xhci->intr[v]; @@ -619,7 +632,12 @@ static void xhci_write_event(XHCIState *xhci, XHCIEvent *event, int v) ev_trb.status, ev_trb.control); addr = intr->er_start + TRB_SIZE*intr->er_ep_idx; - dma_memory_write(xhci->as, addr, &ev_trb, TRB_SIZE, MEMTXATTRS_UNSPECIFIED); + if (dma_memory_write(xhci->as, addr, &ev_trb, TRB_SIZE, + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA memory access failed!\n", + __func__); + xhci_die(xhci); + } intr->er_ep_idx++; if (intr->er_ep_idx >= intr->er_size) { @@ -680,8 +698,12 @@ static TRBType xhci_ring_fetch(XHCIState *xhci, XHCIRing *ring, XHCITRB *trb, while (1) { TRBType type; - dma_memory_read(xhci->as, ring->dequeue, trb, TRB_SIZE, - MEMTXATTRS_UNSPECIFIED); + if (dma_memory_read(xhci->as, ring->dequeue, trb, TRB_SIZE, + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA memory access failed!\n", + __func__); + return 0; + } trb->addr = ring->dequeue; trb->ccs = ring->ccs; le64_to_cpus(&trb->parameter); @@ -798,8 +820,14 @@ static void xhci_er_reset(XHCIState *xhci, int v) xhci_die(xhci); return; } - dma_memory_read(xhci->as, erstba, &seg, sizeof(seg), - MEMTXATTRS_UNSPECIFIED); + if (dma_memory_read(xhci->as, erstba, &seg, sizeof(seg), + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA memory access failed!\n", + __func__); + xhci_die(xhci); + return; + } + le32_to_cpus(&seg.addr_low); le32_to_cpus(&seg.addr_high); le32_to_cpus(&seg.size); @@ -2415,8 +2443,12 @@ static TRBCCode xhci_get_port_bandwidth(XHCIState *xhci, uint64_t pctx) /* TODO: actually implement real values here */ bw_ctx[0] = 0; memset(&bw_ctx[1], 80, xhci->numports); /* 80% */ - dma_memory_write(xhci->as, ctx, bw_ctx, sizeof(bw_ctx), - MEMTXATTRS_UNSPECIFIED); + if (dma_memory_write(xhci->as, ctx, bw_ctx, sizeof(bw_ctx), + MEMTXATTRS_UNSPECIFIED) != MEMTX_OK) { + qemu_log_mask(LOG_GUEST_ERROR, "%s: DMA memory write failed!\n", + __func__); + return CC_TRB_ERROR; + } return CC_SUCCESS; }