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hw/sd: sdhci: Correctly set the controller status for ADMA

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Fixes: CVE-2020-17380
Fixes: CVE-2020-25085
Fixes: CVE-2021-3409

When an ADMA transfer is started, the codes forget to set the
controller status to indicate a transfer is in progress.

With this fix, the following 2 reproducers:

https://paste.debian.net/plain/1185136
https://paste.debian.net/plain/1185141

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 <alxndr@bu.edu>
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 <bmeng.cn@gmail.com>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Signed-off-by: Jiajie Li <lijiajie11@huawei.com>
This commit is contained in:
Chen Qun 2021-05-08 10:51:37 +08:00
parent 4a0b5b3647
commit dd8a18a37e
1 changed files with 75 additions and 0 deletions
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75
hw-sd-sdhci-Correctly-set-the-controller-status-for-.patch Normal file
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@ -0,0 +1,75 @@
From 8d286a071877216c5b282bb14f34ff3b09d3f3f8 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Sat, 8 May 2021 10:51:37 +0800
Subject: [PATCH] hw/sd: sdhci: Correctly set the controller status for ADMA
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fixes: CVE-2020-17380
Fixes: CVE-2020-25085
Fixes: CVE-2021-3409
When an ADMA transfer is started, the codes forget to set the
controller status to indicate a transfer is in progress.
With this fix, the following 2 reproducers:
https://paste.debian.net/plain/1185136
https://paste.debian.net/plain/1185141
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 <alxndr@bu.edu>
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 <bmeng.cn@gmail.com>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Jiajie Li <lijiajie11@huawei.com>
---
hw/sd/sdhci.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index fdb59f44e6..8c857d1e40 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -776,8 +776,9 @@ static void sdhci_do_adma(SDHCIState *s)
switch (dscr.attr & SDHC_ADMA_ATTR_ACT_MASK) {
case SDHC_ADMA_ATTR_ACT_TRAN: /* data transfer */
-
+ s->prnsts |= SDHC_DATA_INHIBIT | SDHC_DAT_LINE_ACTIVE;
if (s->trnmod & SDHC_TRNS_READ) {
+ s->prnsts |= SDHC_DOING_READ;
while (length) {
if (s->data_count == 0) {
for (n = 0; n < block_size; n++) {
@@ -807,6 +808,7 @@ static void sdhci_do_adma(SDHCIState *s)
}
}
} else {
+ s->prnsts |= SDHC_DOING_WRITE;
while (length) {
begin = s->data_count;
if ((length + begin) < block_size) {
--
2.27.0