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Mon, 21 Mar 2022 17:03:42 +0000 (UTC) Received: from thuth.com (unknown [10.39.195.17]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5D8F640C1257; Mon, 21 Mar 2022 17:03:40 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org, Peter Maydell Subject: [PULL 7/8] hw/sd/sdhci: Prohibit DMA accesses to devices Date: Mon, 21 Mar 2022 18:03:19 +0100 Message-Id: <20220321170320.282496-8-thuth@redhat.com> In-Reply-To: <20220321170320.282496-1-thuth@redhat.com> References: <20220321170320.282496-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 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_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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: , Cc: qemu-block@nongnu.org, Bin Meng , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Alexander Bulekov , Gerd Hoffmann , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Philippe Mathieu-Daudé The issue reported by OSS-Fuzz produces the following backtrace: ==447470==ERROR: AddressSanitizer: heap-buffer-overflow READ of size 1 at 0x61500002a080 thread T0 #0 0x71766d47 in sdhci_read_dataport hw/sd/sdhci.c:474:18 #1 0x7175f139 in sdhci_read hw/sd/sdhci.c:1022:19 #2 0x721b937b in memory_region_read_accessor softmmu/memory.c:440:11 #3 0x72171e51 in access_with_adjusted_size softmmu/memory.c:554:18 #4 0x7216f47c in memory_region_dispatch_read1 softmmu/memory.c:1424:16 #5 0x7216ebb9 in memory_region_dispatch_read softmmu/memory.c:1452:9 #6 0x7212db5d in flatview_read_continue softmmu/physmem.c:2879:23 #7 0x7212f958 in flatview_read softmmu/physmem.c:2921:12 #8 0x7212f418 in address_space_read_full softmmu/physmem.c:2934:18 #9 0x721305a9 in address_space_rw softmmu/physmem.c:2962:16 #10 0x7175a392 in dma_memory_rw_relaxed include/sysemu/dma.h:89:12 #11 0x7175a0ea in dma_memory_rw include/sysemu/dma.h:132:12 #12 0x71759684 in dma_memory_read include/sysemu/dma.h:152:12 #13 0x7175518c in sdhci_do_adma hw/sd/sdhci.c:823:27 #14 0x7174bf69 in sdhci_data_transfer hw/sd/sdhci.c:935:13 #15 0x7176aaa7 in sdhci_send_command hw/sd/sdhci.c:376:9 #16 0x717629ee in sdhci_write hw/sd/sdhci.c:1212:9 #17 0x72172513 in memory_region_write_accessor softmmu/memory.c:492:5 #18 0x72171e51 in access_with_adjusted_size softmmu/memory.c:554:18 #19 0x72170766 in memory_region_dispatch_write softmmu/memory.c:1504:16 #20 0x721419ee in flatview_write_continue softmmu/physmem.c:2812:23 #21 0x721301eb in flatview_write softmmu/physmem.c:2854:12 #22 0x7212fca8 in address_space_write softmmu/physmem.c:2950:18 #23 0x721d9a53 in qtest_process_command softmmu/qtest.c:727:9 A DMA descriptor is previously filled in RAM. An I/O access to the device (frames #22 to #16) start the DMA engine (frame #13). The engine fetch the descriptor and execute the request, which itself accesses the SDHCI I/O registers (frame #1 and #0), triggering a re-entrancy issue. Fix by prohibit transactions from the DMA to devices. The DMA engine is thus restricted to memories. Reported-by: OSS-Fuzz (Issue 36391) Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Thomas Huth Resolves: https://gitlab.com/qemu-project/qemu/-/issues/451 Message-Id: <20211215205656.488940-3-philmd@redhat.com> Signed-off-by: Thomas Huth --- hw/sd/sdhci.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c index fe2f21f0c3..0e5e988927 100644 --- a/hw/sd/sdhci.c +++ b/hw/sd/sdhci.c @@ -741,6 +741,7 @@ static void sdhci_do_adma(SDHCIState *s) { unsigned int begin, length; const uint16_t block_size = s->blksize & BLOCK_SIZE_MASK; + const MemTxAttrs attrs = { .memory = true }; ADMADescr dscr = {}; MemTxResult res; int i; @@ -794,7 +795,7 @@ static void sdhci_do_adma(SDHCIState *s) res = dma_memory_write(s->dma_as, dscr.addr, &s->fifo_buffer[begin], s->data_count - begin, - MEMTXATTRS_UNSPECIFIED); + attrs); if (res != MEMTX_OK) { break; } @@ -823,7 +824,7 @@ static void sdhci_do_adma(SDHCIState *s) res = dma_memory_read(s->dma_as, dscr.addr, &s->fifo_buffer[begin], s->data_count - begin, - MEMTXATTRS_UNSPECIFIED); + attrs); if (res != MEMTX_OK) { break; } -- 2.27.0