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[Qemu-ppc] [PATCH 0/1] qemu/nbd: fix segmentation fault when .desc is no
From: |
Murilo Opsfelder Araujo |
Subject: |
[Qemu-ppc] [PATCH 0/1] qemu/nbd: fix segmentation fault when .desc is not null-terminated |
Date: |
Fri, 5 Jan 2018 11:32:40 -0200 |
Hello, QEMU community.
The following patch is to fix a segmentation fault when nbd_runtime_opts.desc is
not null-terminated.
This issue emerged when building QEMU with --enable-gcov, as described by
https://bugs.launchpad.net/qemu/+bug/1727259.
To reproduce on ppc64le, run the following commands on QEMU git tree:
mkdir build
mkdir -p tests/qemu-iotests/scratch
cd build
../configure --target-list=ppc64-softmmu --enable-gcov
make -j$(nproc)
./qemu-img create -f qcow2 -o compat=1.1 ./tests/qemu-iotests/scratch/t.qcow2
64M
./qemu-io --cache writeback -f qcow2 -c "write -P 0xa 0x1000 0x1000"
./tests/qemu-iotests/scratch/t.qcow2
./qemu-io --cache writeback -f qcow2 -c "write -P 0xb 0x2000 0x1000"
./tests/qemu-iotests/scratch/t.qcow2
./qemu-img snapshot -c sn1 ./tests/qemu-iotests/scratch/t.qcow2
./qemu-io --cache writeback -f qcow2 -c "write -P 0xc 0x1000 0x1000"
./tests/qemu-iotests/scratch/t.qcow2
./qemu-io --cache writeback -f qcow2 -c "write -P 0xd 0x2000 0x1000"
./tests/qemu-iotests/scratch/t.qcow2
./qemu-img check -f qcow2 ./tests/qemu-iotests/scratch/t.qcow2
./qemu-io --cache writeback -f qcow2 -c "read -P 0xc 0x1000 0x1000"
./tests/qemu-iotests/scratch/t.qcow2
./qemu-io --cache writeback -f qcow2 -c "read -P 0xd 0x2000 0x1000"
./tests/qemu-iotests/scratch/t.qcow2
# run in background, wait some seconds until it starts
./qemu-nbd -v -t -k ${PWD}/tests/qemu-iotests/scratch/test_qemu_nbd_socket
./tests/qemu-iotests/scratch/t.qcow2 -l sn1 &
sleep 5
# this will cause qemu-io to segfault
./qemu-io --cache writeback -f qcow2 -f raw --cache=writeback -r -c "read -P
0xa 0x1000 0x1000"
nbd:unix:${PWD}/tests/qemu-iotests/scratch/test_qemu_nbd_socket
# kill qemu-nbd
kill $(pidof qemu-nbd)
Cheers
Murilo
Murilo Opsfelder Araujo (1):
block/nbd: fix segmentation fault when .desc is not null-terminated
block/nbd.c | 1 +
1 file changed, 1 insertion(+)
--
2.14.3
- [Qemu-ppc] [PATCH 0/1] qemu/nbd: fix segmentation fault when .desc is not null-terminated,
Murilo Opsfelder Araujo <=