File hw-char-bcm2835_aux-Allow-less-than-32-b.patch of Package qemu.30221

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File hw-char-bcm2835_aux-Allow-less-than-32-b.patch of Package qemu.30221

From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <f4bug@amsat.org>
Date: Fri, 2 Oct 2020 20:10:32 +0200
Subject: hw/char/bcm2835_aux: Allow less than 32-bit accesses
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Git-commit: 3059344f01e1bf9625570ef2e8396fa011e9431d
References: bsc#1172382 (CVE-2020-13754)

The "BCM2835 ARM Peripherals" datasheet [*] chapter 2
("Auxiliaries: UART1 & SPI1, SPI2"), list the register
sizes as 3/8/16/32 bits. We assume this means this
peripheral allows 8-bit accesses.

This was not an issue until commit 5d971f9e67 which reverted
("memory: accept mismatching sizes in memory_region_access_valid").

The model is implemented as 32-bit accesses (see commit 97398d900c,
all registers are 32-bit) so replace MemoryRegionOps.valid as
MemoryRegionOps.impl, and re-introduce MemoryRegionOps.valid
with a 8/32-bit range.

[*] https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

Fixes: 97398d900c ("bcm2835_aux: add emulation of BCM2835 AUX (aka UART1) block")
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20201002181032.1899463-1-f4bug@amsat.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Dario Faggioli <dfaggioli@suse.com>
---
 hw/char/bcm2835_aux.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/char/bcm2835_aux.c b/hw/char/bcm2835_aux.c
index a6fc1bf152bed5d7c9f55307e44b..261b77b5364de42d341457d3f21f 100644
--- a/hw/char/bcm2835_aux.c
+++ b/hw/char/bcm2835_aux.c
@@ -249,7 +249,9 @@ static const MemoryRegionOps bcm2835_aux_ops = {
     .read = bcm2835_aux_read,
     .write = bcm2835_aux_write,
     .endianness = DEVICE_NATIVE_ENDIAN,
-    .valid.min_access_size = 4,
+    .impl.min_access_size = 4,
+    .impl.max_access_size = 4,
+    .valid.min_access_size = 1,
     .valid.max_access_size = 4,
 };

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File hw-char-bcm2835_aux-Allow-less-than-32-b.patch of Package qemu.30221

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