From 8be45cc947832b3c02144c9d52921f499f2d77fe Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Wed, 3 Mar 2021 20:26:36 +0800 Subject: [PATCH] hw/sd: sdhci: Don't write to SDHC_SYSAD register when transfer is in progress MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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: outl 0xcf8 0x80001010 outl 0xcfc 0xfbefff00 outl 0xcf8 0x80001001 outl 0xcfc 0x06000000 write 0xfbefff2c 0x1 0x05 write 0xfbefff0f 0x1 0x37 write 0xfbefff0a 0x1 0x01 write 0xfbefff0f 0x1 0x29 write 0xfbefff0f 0x1 0x02 write 0xfbefff0f 0x1 0x03 write 0xfbefff04 0x1 0x01 write 0xfbefff05 0x1 0x01 write 0xfbefff07 0x1 0x02 write 0xfbefff0c 0x1 0x33 write 0xfbefff0e 0x1 0x20 write 0xfbefff0f 0x1 0x00 write 0xfbefff2a 0x1 0x01 write 0xfbefff0c 0x1 0x00 write 0xfbefff03 0x1 0x00 write 0xfbefff05 0x1 0x00 write 0xfbefff2a 0x1 0x02 write 0xfbefff0c 0x1 0x32 write 0xfbefff01 0x1 0x01 write 0xfbefff02 0x1 0x01 write 0xfbefff03 0x1 0x01 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-Universität Bochum) Reported-by: Sergej Schumilo (Ruhr-Universität Bochum) Reported-by: Simon Wörner (Ruhr-Universität 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 Tested-by: Alexander Bulekov Signed-off-by: Bin Meng Message-Id: <20210303122639.20004-3-bmeng.cn@gmail.com> Signed-off-by: Philippe Mathieu-Daudé CVE: CVE-2021-3409 CVE-2020-17380 Upstream-Status: Backport [import from ubuntu https://git.launchpad.net/ubuntu/+source/qemu/tree/debian/patches/CVE-2021-3409-2.patch?h=ubuntu/focal-security Upstream commit https://github.com/qemu/qemu/commit/8be45cc947832b3c02144c9d52921f499f2d77fe ] Signed-off-by: Chee Yang Lee --- hw/sd/sdhci.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) --- a/hw/sd/sdhci.c +++ b/hw/sd/sdhci.c @@ -1117,15 +1117,17 @@ sdhci_write(void *opaque, hwaddr offset, 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;