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[44.242.66.180]) by smtp.gmail.com with ESMTPSA id gz14sm10813069ejc.105.2021.02.15.07.11.33 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Feb 2021 07:11:38 -0800 (PST) From: Bin Meng To: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Mauro Matteo Cascella , Li Qiang , Alexander Bulekov , Alistair Francis , Prasad J Pandit , Bandan Das Subject: [PATCH 2/4] hw/sd: sdhci: Don't write to SDHC_SYSAD register when transfer is in progress Date: Mon, 15 Feb 2021 23:11:09 +0800 Message-Id: <1613401871-59515-3-git-send-email-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1613401871-59515-1-git-send-email-bmeng.cn@gmail.com> References: <1613401871-59515-1-git-send-email-bmeng.cn@gmail.com> Received-SPF: pass client-ip=2a00:1450:4864:20::52e; envelope-from=bmeng.cn@gmail.com; helo=mail-ed1-x52e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-stable@nongnu.org, qemu-block@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Per "SD Host Controller Standard Specification Version 7.00" chapter 2.2.1 SDMA System Address Register: This register can be accessed only if no transaction is executing (i.e., after a transaction has stopped). With this fix, the following reproducer: https://paste.debian.net/plain/1185137 cannot be reproduced with the following QEMU command line: $ qemu-system-x86_64 -nographic -machine accel=qtest -m 512M \ -nodefaults -device sdhci-pci,sd-spec-version=3 \ -drive if=sd,index=0,file=null-co://,format=raw,id=mydrive \ -device sd-card,drive=mydrive -qtest stdio Cc: qemu-stable@nongnu.org Fixes: CVE-2020-17380 Fixes: CVE-2020-25085 Fixes: CVE-2021-3409 Fixes: d7dfca0807a0 ("hw/sdhci: introduce standard SD host controller") Reported-by: Alexander Bulekov Reported-by: Cornelius Aschermann (Ruhr-University Bochum) Reported-by: Muhammad Ramdhan Reported-by: Sergej Schumilo (Ruhr-University Bochum) Reported-by: Simon Wrner (Ruhr-University Bochum) Buglink: https://bugs.launchpad.net/qemu/+bug/1892960 Buglink: https://bugs.launchpad.net/qemu/+bug/1909418 Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1928146 Signed-off-by: Bin Meng --- hw/sd/sdhci.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c index 1c5ab26..05cb281 100644 --- a/hw/sd/sdhci.c +++ b/hw/sd/sdhci.c @@ -1122,15 +1122,17 @@ sdhci_write(void *opaque, hwaddr offset, uint64_t val, unsigned size) switch (offset & ~0x3) { case SDHC_SYSAD: - s->sdmasysad = (s->sdmasysad & mask) | value; - MASKED_WRITE(s->sdmasysad, mask, value); - /* Writing to last byte of sdmasysad might trigger transfer */ - if (!(mask & 0xFF000000) && TRANSFERRING_DATA(s->prnsts) && s->blkcnt && - s->blksize && SDHC_DMA_TYPE(s->hostctl1) == SDHC_CTRL_SDMA) { - if (s->trnmod & SDHC_TRNS_MULTI) { - sdhci_sdma_transfer_multi_blocks(s); - } else { - sdhci_sdma_transfer_single_block(s); + if (!TRANSFERRING_DATA(s->prnsts)) { + s->sdmasysad = (s->sdmasysad & mask) | value; + MASKED_WRITE(s->sdmasysad, mask, value); + /* Writing to last byte of sdmasysad might trigger transfer */ + if (!(mask & 0xFF000000) && s->blkcnt && s->blksize && + SDHC_DMA_TYPE(s->hostctl1) == SDHC_CTRL_SDMA) { + if (s->trnmod & SDHC_TRNS_MULTI) { + sdhci_sdma_transfer_multi_blocks(s); + } else { + sdhci_sdma_transfer_single_block(s); + } } } break; -- 2.7.4