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virtcontainers: update context id of vsock to uint64

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The CID of VSock needs to be change to uint64. Otherwise that leads to
an endianess issue. For more details see
https://github.com/kata-containers/runtime/issues/947

Remove the uint64 introduced by #984

Fixes: #958

Signed-off-by: Alice Frosi <afrosi@de.ibm.com>
This commit is contained in:
Alice Frosi 2018-11-30 13:54:45 +00:00
parent 9dee04a314
commit deb6f16d82
5 changed files with 14 additions and 11 deletions
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2
virtcontainers/kata_agent.go
View File

@ -73,7 +73,7 @@ type KataAgentConfig struct {
}
type kataVSOCK struct {
contextID uint32
contextID uint64
port uint32
vhostFd *os.File
}

2
virtcontainers/qemu_arch_base.go
View File

@ -422,7 +422,7 @@ func (q *qemuArchBase) appendVSockPCI(devices []govmmQemu.Device, vsock kataVSOC
devices = append(devices,
govmmQemu.VSOCKDevice{
ID: fmt.Sprintf("vsock-%d", vsock.contextID),
ContextID: uint64(vsock.contextID),
ContextID: vsock.contextID,
VHostFD: vsock.vhostFd,
DisableModern: q.nestedRun,
},

4
virtcontainers/qemu_test.go
View File

@ -249,14 +249,14 @@ func TestQemuAddDeviceSerialPortDev(t *testing.T) {
}
func TestQemuAddDeviceKataVSOCK(t *testing.T) {
contextID := uint32(3)
contextID := uint64(3)
port := uint32(1024)
vHostFD := os.NewFile(1, "vsock")
expectedOut := []govmmQemu.Device{
govmmQemu.VSOCKDevice{
ID: fmt.Sprintf("vsock-%d", contextID),
ContextID: uint64(contextID),
ContextID: contextID,
VHostFD: vHostFD,
},
}

15
virtcontainers/utils/utils_linux.go
View File

@ -22,7 +22,10 @@ const ioctlVhostVsockSetGuestCid = 0x4008AF60
var ioctlFunc = ioctl
var maxUInt uint32 = 1<<32 - 1
// maxUInt represents the maximum valid value for the context ID.
// The upper 32 bits of the CID are reserved and zeroed.
// See http://stefanha.github.io/virtio/
var maxUInt uint64 = 1<<32 - 1
func ioctl(fd uintptr, request int, arg1 uint64) error {
if _, _, errno := unix.Syscall(
@ -51,15 +54,15 @@ func ioctl(fd uintptr, request int, arg1 uint64) error {
// - Reduce the probability of a *DoS attack*, since other processes don't know whatis the initial context ID
// used by findContextID to find a context ID available
//
func FindContextID() (*os.File, uint32, error) {
func FindContextID() (*os.File, uint64, error) {
// context IDs 0x0, 0x1 and 0x2 are reserved, 0x3 is the first context ID usable.
var firstContextID uint32 = 0x3
var firstContextID uint64 = 0x3
var contextID = firstContextID
// Generate a random number
n, err := rand.Int(rand.Reader, big.NewInt(int64(maxUInt)))
if err == nil && n.Int64() >= int64(firstContextID) {
contextID = uint32(n.Int64())
contextID = uint64(n.Int64())
}
// Open vhost-vsock device to check what context ID is available.
@ -72,14 +75,14 @@ func FindContextID() (*os.File, uint32, error) {
// Looking for the first available context ID.
for cid := contextID; cid <= maxUInt; cid++ {
if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, uint64(cid)); err == nil {
if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, cid); err == nil {
return vsockFd, cid, nil
}
}
// Last chance to get a free context ID.
for cid := contextID - 1; cid >= firstContextID; cid-- {
if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, uint64(cid)); err == nil {
if err := ioctlFunc(vsockFd.Fd(), ioctlVhostVsockSetGuestCid, cid); err == nil {
return vsockFd, cid, nil
}
}

2
virtcontainers/utils/utils_linux_test.go
View File

@ -26,7 +26,7 @@ func TestFindContextID(t *testing.T) {
maxUInt = orgMaxUInt
}()
VHostVSockDevicePath = "/dev/null"
maxUInt = uint32(1000000)
maxUInt = uint64(1000000)
f, cid, err := FindContextID()
assert.Nil(f)