github/kata-containers
1
0
Fork 1
mirror of https://github.com/kata-containers/kata-containers.git synced 2025-07-04 02:56:18 +00:00
Code Issues Projects Releases Wiki Activity

virtcontainers: update context id of vsock to uint64

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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)