Merge remote-tracking branch 'remotes/philmd-gitlab/tags/sdcard-CVE-2020-13253-pull-request' into staging

Fix CVE-2020-13253

By using invalidated address, guest can do out-of-bounds accesses.
These patches fix the issue by only allowing SD card image sizes
power of 2, and not switching to SEND_DATA state when the address
is invalid (out of range).

This issue was found using QEMU fuzzing mode (using --enable-fuzzing,
see docs/devel/fuzzing.txt) and reported by Alexander Bulekov.

Reproducer:
  https://bugs.launchpad.net/qemu/+bug/1880822/comments/1

CI jobs results:
. https://cirrus-ci.com/build/5157142548185088
. https://gitlab.com/philmd/qemu/-/pipelines/166381731
. https://travis-ci.org/github/philmd/qemu/builds/707956535

# gpg: Signature made Tue 14 Jul 2020 14:54:44 BST
# gpg:                using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD  6BB2 E3E3 2C2C DEAD C0DE

* remotes/philmd-gitlab/tags/sdcard-CVE-2020-13253-pull-request:
  hw/sd/sdcard: Do not switch to ReceivingData if address is invalid
  hw/sd/sdcard: Update coding style to make checkpatch.pl happy
  hw/sd/sdcard: Do not allow invalid SD card sizes
  hw/sd/sdcard: Simplify realize() a bit
  hw/sd/sdcard: Restrict Class 6 commands to SCSD cards
  tests/acceptance/boot_linux: Expand SD card image to power of 2
  tests/acceptance/boot_linux: Tag tests using a SD card with 'device:sd'
  docs/orangepi: Add instructions for resizing SD image to power of two
  MAINTAINERS: Cc qemu-block mailing list

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/docs/system/arm/orangepi.rst b/docs/system/arm/orangepi.rst
index c41adad488..6f23907fb6 100644
--- a/docs/system/arm/orangepi.rst
+++ b/docs/system/arm/orangepi.rst
@@ -127,6 +127,16 @@ can be downloaded from:
 Alternatively, you can also choose to build you own image with buildroot
 using the orangepi_pc_defconfig. Also see https://buildroot.org for more information.
 
+When using an image as an SD card, it must be resized to a power of two. This can be
+done with the qemu-img command. It is recommended to only increase the image size
+instead of shrinking it to a power of two, to avoid loss of data. For example,
+to prepare a downloaded Armbian image, first extract it and then increase
+its size to one gigabyte as follows:
+
+.. code-block:: bash
+
+  $ qemu-img resize Armbian_19.11.3_Orangepipc_bionic_current_5.3.9.img 1G
+
 You can choose to attach the selected image either as an SD card or as USB mass storage.
 For example, to boot using the Orange Pi PC Debian image on SD card, simply add the -sd
 argument and provide the proper root= kernel parameter:
@@ -213,12 +223,12 @@ Next, unzip the NetBSD image and write the U-Boot binary including SPL using:
   $ dd if=/path/to/u-boot-sunxi-with-spl.bin of=armv7.img bs=1024 seek=8 conv=notrunc
 
 Finally, before starting the machine the SD image must be extended such
-that the NetBSD kernel will not conclude the NetBSD partition is larger than
-the emulated SD card:
+that the size of the SD image is a power of two and that the NetBSD kernel
+will not conclude the NetBSD partition is larger than the emulated SD card:
 
 .. code-block:: bash
 
-  $ dd if=/dev/zero bs=1M count=64 >> armv7.img
+  $ qemu-img resize armv7.img 2G
 
 Start the machine using the following command: