Merge release-20210301.0-5-ga9441aea2 (automated)

27 files changed, 292 insertions, 300 deletions

diff --git a/pkg/sentry/platform/kvm/bluepill.go b/pkg/sentry/platform/kvm/bluepill.go
index 2c970162e..fd1131638 100644
--- a/pkg/sentry/platform/kvm/bluepill.go
+++ b/pkg/sentry/platform/kvm/bluepill.go
@@ -17,8 +17,8 @@ package kvm
 import (
 	"fmt"
 	"reflect"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/safecopy"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
@@ -41,7 +41,7 @@ var (
 	//
 	// We use SIGCHLD because it is not masked by the runtime, and
 	// it will be ignored properly by other parts of the kernel.
-	bounceSignal = syscall.SIGCHLD
+	bounceSignal = unix.SIGCHLD
 
 	// bounceSignalMask has only bounceSignal set.
 	bounceSignalMask = uint64(1 << (uint64(bounceSignal) - 1))
@@ -62,7 +62,7 @@ var (
 //
 //go:nosplit
 func redpill() {
-	syscall.RawSyscall(^uintptr(0), 0, 0, 0)
+	unix.RawSyscall(^uintptr(0), 0, 0, 0)
 }
 
 // dieHandler is called by dieTrampoline.
diff --git a/pkg/sentry/platform/kvm/bluepill_amd64.go b/pkg/sentry/platform/kvm/bluepill_amd64.go
index 83a4766fb..f4b9a5321 100644
--- a/pkg/sentry/platform/kvm/bluepill_amd64.go
+++ b/pkg/sentry/platform/kvm/bluepill_amd64.go
@@ -17,15 +17,14 @@
 package kvm
 
 import (
-	"syscall"
-
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 )
 
 var (
 	// The action for bluepillSignal is changed by sigaction().
-	bluepillSignal = syscall.SIGSEGV
+	bluepillSignal = unix.SIGSEGV
 )
 
 // bluepillArchEnter is called during bluepillEnter.
diff --git a/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go b/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go
index 0063e947b..198bafdea 100644
--- a/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go
+++ b/pkg/sentry/platform/kvm/bluepill_amd64_unsafe.go
@@ -17,9 +17,9 @@
 package kvm
 
 import (
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 )
@@ -68,8 +68,8 @@ func getHypercallID(addr uintptr) int {
 func bluepillStopGuest(c *vCPU) {
 	// Interrupt: we must have requested an interrupt
 	// window; set the interrupt line.
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_INTERRUPT,
 		uintptr(unsafe.Pointer(&bounce))); errno != 0 {
@@ -83,8 +83,8 @@ func bluepillStopGuest(c *vCPU) {
 //
 //go:nosplit
 func bluepillSigBus(c *vCPU) {
-	if _, _, errno := syscall.RawSyscall( // escapes: no.
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall( // escapes: no.
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_NMI, 0); errno != 0 {
 		throw("NMI injection failed")
diff --git a/pkg/sentry/platform/kvm/bluepill_arm64.go b/pkg/sentry/platform/kvm/bluepill_arm64.go
index 6846abee9..e26b7da8d 100644
--- a/pkg/sentry/platform/kvm/bluepill_arm64.go
+++ b/pkg/sentry/platform/kvm/bluepill_arm64.go
@@ -17,15 +17,14 @@
 package kvm
 
 import (
-	"syscall"
-
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 )
 
 var (
 	// The action for bluepillSignal is changed by sigaction().
-	bluepillSignal = syscall.SIGILL
+	bluepillSignal = unix.SIGILL
 
 	// vcpuSErrBounce is the event of system error for bouncing KVM.
 	vcpuSErrBounce = kvmVcpuEvents{
diff --git a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
index dbbf2a897..07fc4f216 100644
--- a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
+++ b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
@@ -17,9 +17,9 @@
 package kvm
 
 import (
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 )
@@ -80,8 +80,8 @@ func getHypercallID(addr uintptr) int {
 //
 //go:nosplit
 func bluepillStopGuest(c *vCPU) {
-	if _, _, errno := syscall.RawSyscall( // escapes: no.
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall( // escapes: no.
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_VCPU_EVENTS,
 		uintptr(unsafe.Pointer(&vcpuSErrBounce))); errno != 0 {
@@ -94,12 +94,12 @@ func bluepillStopGuest(c *vCPU) {
 //go:nosplit
 func bluepillSigBus(c *vCPU) {
 	// Host must support ARM64_HAS_RAS_EXTN.
-	if _, _, errno := syscall.RawSyscall( // escapes: no.
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall( // escapes: no.
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_VCPU_EVENTS,
 		uintptr(unsafe.Pointer(&vcpuSErrNMI))); errno != 0 {
-		if errno == syscall.EINVAL {
+		if errno == unix.EINVAL {
 			throw("No ARM64_HAS_RAS_EXTN feature in host.")
 		}
 		throw("nmi sErr injection failed")
@@ -110,8 +110,8 @@ func bluepillSigBus(c *vCPU) {
 //
 //go:nosplit
 func bluepillExtDabt(c *vCPU) {
-	if _, _, errno := syscall.RawSyscall( // escapes: no.
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall( // escapes: no.
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_VCPU_EVENTS,
 		uintptr(unsafe.Pointer(&vcpuExtDabt))); errno != 0 {
diff --git a/pkg/sentry/platform/kvm/bluepill_fault.go b/pkg/sentry/platform/kvm/bluepill_fault.go
index a182e4f22..37c53fa02 100644
--- a/pkg/sentry/platform/kvm/bluepill_fault.go
+++ b/pkg/sentry/platform/kvm/bluepill_fault.go
@@ -16,8 +16,8 @@ package kvm
 
 import (
 	"sync/atomic"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
 
@@ -40,7 +40,7 @@ const (
 //
 //go:nosplit
 func yield() {
-	syscall.RawSyscall(syscall.SYS_SCHED_YIELD, 0, 0, 0)
+	unix.RawSyscall(unix.SYS_SCHED_YIELD, 0, 0, 0)
 }
 
 // calculateBluepillFault calculates the fault address range.
@@ -112,16 +112,16 @@ func handleBluepillFault(m *machine, physical uintptr, phyRegions []physicalRegi
 	atomic.StoreUint32(&m.nextSlot, slot)
 
 	switch errno {
-	case syscall.EEXIST:
+	case unix.EEXIST:
 		// The region already exists. It's possible that we raced with
 		// another vCPU here. We just revert nextSlot and return true,
 		// because this must have been satisfied by some other vCPU.
 		return virtualStart + (physical - physicalStart), true
-	case syscall.EINVAL:
+	case unix.EINVAL:
 		throw("set memory region failed; out of slots")
-	case syscall.ENOMEM:
+	case unix.ENOMEM:
 		throw("set memory region failed: out of memory")
-	case syscall.EFAULT:
+	case unix.EFAULT:
 		throw("set memory region failed: invalid physical range")
 	default:
 		throw("set memory region failed: unknown reason")
diff --git a/pkg/sentry/platform/kvm/bluepill_unsafe.go b/pkg/sentry/platform/kvm/bluepill_unsafe.go
index 55da6dd95..6f87236ad 100644
--- a/pkg/sentry/platform/kvm/bluepill_unsafe.go
+++ b/pkg/sentry/platform/kvm/bluepill_unsafe.go
@@ -21,9 +21,9 @@ package kvm
 
 import (
 	"sync/atomic"
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 )
 
@@ -102,23 +102,23 @@ func bluepillHandler(context unsafe.Pointer) {
 	}
 
 	for {
-		_, _, errno := syscall.RawSyscall(syscall.SYS_IOCTL, uintptr(c.fd), _KVM_RUN, 0) // escapes: no.
+		_, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(c.fd), _KVM_RUN, 0) // escapes: no.
 		switch errno {
 		case 0: // Expected case.
-		case syscall.EINTR:
+		case unix.EINTR:
 			// First, we process whatever pending signal
 			// interrupted KVM. Since we're in a signal handler
 			// currently, all signals are masked and the signal
 			// must have been delivered directly to this thread.
-			timeout := syscall.Timespec{}
-			sig, _, errno := syscall.RawSyscall6( // escapes: no.
-				syscall.SYS_RT_SIGTIMEDWAIT,
+			timeout := unix.Timespec{}
+			sig, _, errno := unix.RawSyscall6( // escapes: no.
+				unix.SYS_RT_SIGTIMEDWAIT,
 				uintptr(unsafe.Pointer(&bounceSignalMask)),
 				0,                                 // siginfo.
 				uintptr(unsafe.Pointer(&timeout)), // timeout.
 				8,                                 // sigset size.
 				0, 0)
-			if errno == syscall.EAGAIN {
+			if errno == unix.EAGAIN {
 				continue
 			}
 			if errno != 0 {
@@ -140,7 +140,7 @@ func bluepillHandler(context unsafe.Pointer) {
 				c.runData.requestInterruptWindow = 1
 				continue // Rerun vCPU.
 			}
-		case syscall.EFAULT:
+		case unix.EFAULT:
 			// If a fault is not serviceable due to the host
 			// backing pages having page permissions, instead of an
 			// MMIO exit we receive EFAULT from the run ioctl. We
@@ -148,7 +148,7 @@ func bluepillHandler(context unsafe.Pointer) {
 			// mode and have interrupts disabled.
 			bluepillSigBus(c)
 			continue // Rerun vCPU.
-		case syscall.ENOSYS:
+		case unix.ENOSYS:
 			bluepillHandleEnosys(c)
 			continue
 		default:
diff --git a/pkg/sentry/platform/kvm/filters_amd64.go b/pkg/sentry/platform/kvm/filters_amd64.go
index d3d216aa5..a78be3403 100644
--- a/pkg/sentry/platform/kvm/filters_amd64.go
+++ b/pkg/sentry/platform/kvm/filters_amd64.go
@@ -15,8 +15,6 @@
 package kvm
 
 import (
-	"syscall"
-
 	"golang.org/x/sys/unix"
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
@@ -26,17 +24,17 @@ import (
 // SyscallFilters returns syscalls made exclusively by the KVM platform.
 func (*KVM) SyscallFilters() seccomp.SyscallRules {
 	return seccomp.SyscallRules{
-		syscall.SYS_ARCH_PRCTL: {},
-		syscall.SYS_IOCTL:      {},
+		unix.SYS_ARCH_PRCTL: {},
+		unix.SYS_IOCTL:      {},
 		unix.SYS_MEMBARRIER: []seccomp.Rule{
 			{
 				seccomp.EqualTo(linux.MEMBARRIER_CMD_PRIVATE_EXPEDITED),
 				seccomp.EqualTo(0),
 			},
 		},
-		syscall.SYS_MMAP:            {},
-		syscall.SYS_RT_SIGSUSPEND:   {},
-		syscall.SYS_RT_SIGTIMEDWAIT: {},
-		0xffffffffffffffff:          {}, // KVM uses syscall -1 to transition to host.
+		unix.SYS_MMAP:            {},
+		unix.SYS_RT_SIGSUSPEND:   {},
+		unix.SYS_RT_SIGTIMEDWAIT: {},
+		0xffffffffffffffff:       {}, // KVM uses syscall -1 to transition to host.
 	}
 }
diff --git a/pkg/sentry/platform/kvm/filters_arm64.go b/pkg/sentry/platform/kvm/filters_arm64.go
index 21abc2a3d..4e5b91048 100644
--- a/pkg/sentry/platform/kvm/filters_arm64.go
+++ b/pkg/sentry/platform/kvm/filters_arm64.go
@@ -15,8 +15,6 @@
 package kvm
 
 import (
-	"syscall"
-
 	"golang.org/x/sys/unix"
 
 	"gvisor.dev/gvisor/pkg/abi/linux"
@@ -26,16 +24,16 @@ import (
 // SyscallFilters returns syscalls made exclusively by the KVM platform.
 func (*KVM) SyscallFilters() seccomp.SyscallRules {
 	return seccomp.SyscallRules{
-		syscall.SYS_IOCTL: {},
+		unix.SYS_IOCTL: {},
 		unix.SYS_MEMBARRIER: []seccomp.Rule{
 			{
 				seccomp.EqualTo(linux.MEMBARRIER_CMD_PRIVATE_EXPEDITED),
 				seccomp.EqualTo(0),
 			},
 		},
-		syscall.SYS_MMAP:            {},
-		syscall.SYS_RT_SIGSUSPEND:   {},
-		syscall.SYS_RT_SIGTIMEDWAIT: {},
-		0xffffffffffffffff:          {}, // KVM uses syscall -1 to transition to host.
+		unix.SYS_MMAP:            {},
+		unix.SYS_RT_SIGSUSPEND:   {},
+		unix.SYS_RT_SIGTIMEDWAIT: {},
+		0xffffffffffffffff:       {}, // KVM uses syscall -1 to transition to host.
 	}
 }
diff --git a/pkg/sentry/platform/kvm/kvm.go b/pkg/sentry/platform/kvm/kvm.go
index 7bdf57436..92c05a9ad 100644
--- a/pkg/sentry/platform/kvm/kvm.go
+++ b/pkg/sentry/platform/kvm/kvm.go
@@ -18,8 +18,8 @@ package kvm
 import (
 	"fmt"
 	"os"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/platform"
@@ -77,7 +77,7 @@ var (
 
 // OpenDevice opens the KVM device at /dev/kvm and returns the File.
 func OpenDevice() (*os.File, error) {
-	f, err := os.OpenFile("/dev/kvm", syscall.O_RDWR, 0)
+	f, err := os.OpenFile("/dev/kvm", unix.O_RDWR, 0)
 	if err != nil {
 		return nil, fmt.Errorf("error opening /dev/kvm: %v", err)
 	}
@@ -99,11 +99,11 @@ func New(deviceFile *os.File) (*KVM, error) {
 	// Create a new VM fd.
 	var (
 		vm    uintptr
-		errno syscall.Errno
+		errno unix.Errno
 	)
 	for {
-		vm, _, errno = syscall.Syscall(syscall.SYS_IOCTL, fd, _KVM_CREATE_VM, 0)
-		if errno == syscall.EINTR {
+		vm, _, errno = unix.Syscall(unix.SYS_IOCTL, fd, _KVM_CREATE_VM, 0)
+		if errno == unix.EINTR {
 			continue
 		}
 		if errno != 0 {
diff --git a/pkg/sentry/platform/kvm/kvm_amd64_unsafe.go b/pkg/sentry/platform/kvm/kvm_amd64_unsafe.go
index 46c4b9113..0c43d72f4 100644
--- a/pkg/sentry/platform/kvm/kvm_amd64_unsafe.go
+++ b/pkg/sentry/platform/kvm/kvm_amd64_unsafe.go
@@ -18,8 +18,9 @@ package kvm
 
 import (
 	"fmt"
-	"syscall"
 	"unsafe"
+
+	"golang.org/x/sys/unix"
 )
 
 var (
@@ -30,7 +31,7 @@ var (
 
 func updateSystemValues(fd int) error {
 	// Extract the mmap size.
-	sz, _, errno := syscall.RawSyscall(syscall.SYS_IOCTL, uintptr(fd), _KVM_GET_VCPU_MMAP_SIZE, 0)
+	sz, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(fd), _KVM_GET_VCPU_MMAP_SIZE, 0)
 	if errno != 0 {
 		return fmt.Errorf("getting VCPU mmap size: %v", errno)
 	}
@@ -39,19 +40,19 @@ func updateSystemValues(fd int) error {
 	runDataSize = int(sz)
 
 	// Must do the dance to figure out the number of entries.
-	_, _, errno = syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	_, _, errno = unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(fd),
 		_KVM_GET_SUPPORTED_CPUID,
 		uintptr(unsafe.Pointer(&cpuidSupported)))
-	if errno != 0 && errno != syscall.ENOMEM {
+	if errno != 0 && errno != unix.ENOMEM {
 		// Some other error occurred.
 		return fmt.Errorf("getting supported CPUID: %v", errno)
 	}
 
 	// The number should now be correct.
-	_, _, errno = syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	_, _, errno = unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(fd),
 		_KVM_GET_SUPPORTED_CPUID,
 		uintptr(unsafe.Pointer(&cpuidSupported)))
diff --git a/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go b/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go
index 48ccf8474..f07a9f34d 100644
--- a/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go
+++ b/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go
@@ -18,7 +18,8 @@ package kvm
 
 import (
 	"fmt"
-	"syscall"
+
+	"golang.org/x/sys/unix"
 )
 
 var (
@@ -28,7 +29,7 @@ var (
 
 func updateSystemValues(fd int) error {
 	// Extract the mmap size.
-	sz, _, errno := syscall.RawSyscall(syscall.SYS_IOCTL, uintptr(fd), _KVM_GET_VCPU_MMAP_SIZE, 0)
+	sz, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(fd), _KVM_GET_VCPU_MMAP_SIZE, 0)
 	if errno != 0 {
 		return fmt.Errorf("getting VCPU mmap size: %v", errno)
 	}
diff --git a/pkg/sentry/platform/kvm/machine.go b/pkg/sentry/platform/kvm/machine.go
index 1ece1b8d8..0e4cf01e1 100644
--- a/pkg/sentry/platform/kvm/machine.go
+++ b/pkg/sentry/platform/kvm/machine.go
@@ -18,8 +18,8 @@ import (
 	"fmt"
 	"runtime"
 	"sync/atomic"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/atomicbitops"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/procid"
@@ -153,7 +153,7 @@ type dieState struct {
 func (m *machine) newVCPU() *vCPU {
 	// Create the vCPU.
 	id := int(atomic.AddUint32(&m.nextID, 1) - 1)
-	fd, _, errno := syscall.RawSyscall(syscall.SYS_IOCTL, uintptr(m.fd), _KVM_CREATE_VCPU, uintptr(id))
+	fd, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(m.fd), _KVM_CREATE_VCPU, uintptr(id))
 	if errno != 0 {
 		panic(fmt.Sprintf("error creating new vCPU: %v", errno))
 	}
@@ -193,7 +193,7 @@ func newMachine(vm int) (*machine, error) {
 	m.available.L = &m.mu
 
 	// Pull the maximum vCPUs.
-	maxVCPUs, _, errno := syscall.RawSyscall(syscall.SYS_IOCTL, uintptr(m.fd), _KVM_CHECK_EXTENSION, _KVM_CAP_MAX_VCPUS)
+	maxVCPUs, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(m.fd), _KVM_CHECK_EXTENSION, _KVM_CAP_MAX_VCPUS)
 	if errno != 0 {
 		m.maxVCPUs = _KVM_NR_VCPUS
 	} else {
@@ -205,7 +205,7 @@ func newMachine(vm int) (*machine, error) {
 	m.kernel.Init(m.maxVCPUs)
 
 	// Pull the maximum slots.
-	maxSlots, _, errno := syscall.RawSyscall(syscall.SYS_IOCTL, uintptr(m.fd), _KVM_CHECK_EXTENSION, _KVM_CAP_MAX_MEMSLOTS)
+	maxSlots, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(m.fd), _KVM_CHECK_EXTENSION, _KVM_CAP_MAX_MEMSLOTS)
 	if errno != 0 {
 		m.maxSlots = _KVM_NR_MEMSLOTS
 	} else {
@@ -357,13 +357,13 @@ func (m *machine) Destroy() {
 				panic(fmt.Sprintf("error unmapping rundata: %v", err))
 			}
 		}
-		if err := syscall.Close(int(c.fd)); err != nil {
+		if err := unix.Close(int(c.fd)); err != nil {
 			panic(fmt.Sprintf("error closing vCPU fd: %v", err))
 		}
 	}
 
 	// vCPUs are gone: teardown machine state.
-	if err := syscall.Close(m.fd); err != nil {
+	if err := unix.Close(m.fd); err != nil {
 		panic(fmt.Sprintf("error closing VM fd: %v", err))
 	}
 }
@@ -546,7 +546,7 @@ func (c *vCPU) NotifyInterrupt() {
 }
 
 // pid is used below in bounce.
-var pid = syscall.Getpid()
+var pid = unix.Getpid()
 
 // bounce forces a return to the kernel or to host mode.
 //
@@ -588,9 +588,9 @@ func (c *vCPU) bounce(forceGuestExit bool) {
 				// under memory pressure. Since we already
 				// marked ourselves as a waiter, we need to
 				// ensure that a signal is actually delivered.
-				if err := syscall.Tgkill(pid, int(atomic.LoadUint64(&c.tid)), bounceSignal); err == nil {
+				if err := unix.Tgkill(pid, int(atomic.LoadUint64(&c.tid)), bounceSignal); err == nil {
 					break
-				} else if err.(syscall.Errno) == syscall.EAGAIN {
+				} else if err.(unix.Errno) == unix.EAGAIN {
 					continue
 				} else {
 					// Nothing else should be returned by tgkill.
diff --git a/pkg/sentry/platform/kvm/machine_amd64.go b/pkg/sentry/platform/kvm/machine_amd64.go
index 59c752d73..6e583baa3 100644
--- a/pkg/sentry/platform/kvm/machine_amd64.go
+++ b/pkg/sentry/platform/kvm/machine_amd64.go
@@ -21,8 +21,8 @@ import (
 	"math/big"
 	"reflect"
 	"runtime/debug"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/cpuid"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/ring0/pagetables"
@@ -36,8 +36,8 @@ import (
 func (m *machine) initArchState() error {
 	// Set the legacy TSS address. This address is covered by the reserved
 	// range (up to 4GB). In fact, this is a main reason it exists.
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(m.fd),
 		_KVM_SET_TSS_ADDR,
 		uintptr(reservedMemory-(3*usermem.PageSize))); errno != 0 {
@@ -297,13 +297,13 @@ func (c *vCPU) fault(signal int32, info *arch.SignalInfo) (usermem.AccessType, e
 func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo) (usermem.AccessType, error) {
 	// Check for canonical addresses.
 	if regs := switchOpts.Registers; !ring0.IsCanonical(regs.Rip) {
-		return nonCanonical(regs.Rip, int32(syscall.SIGSEGV), info)
+		return nonCanonical(regs.Rip, int32(unix.SIGSEGV), info)
 	} else if !ring0.IsCanonical(regs.Rsp) {
-		return nonCanonical(regs.Rsp, int32(syscall.SIGBUS), info)
+		return nonCanonical(regs.Rsp, int32(unix.SIGBUS), info)
 	} else if !ring0.IsCanonical(regs.Fs_base) {
-		return nonCanonical(regs.Fs_base, int32(syscall.SIGBUS), info)
+		return nonCanonical(regs.Fs_base, int32(unix.SIGBUS), info)
 	} else if !ring0.IsCanonical(regs.Gs_base) {
-		return nonCanonical(regs.Gs_base, int32(syscall.SIGBUS), info)
+		return nonCanonical(regs.Gs_base, int32(unix.SIGBUS), info)
 	}
 
 	// Assign PCIDs.
@@ -332,11 +332,11 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 		return usermem.NoAccess, nil
 
 	case ring0.PageFault:
-		return c.fault(int32(syscall.SIGSEGV), info)
+		return c.fault(int32(unix.SIGSEGV), info)
 
 	case ring0.Debug, ring0.Breakpoint:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGTRAP),
+			Signo: int32(unix.SIGTRAP),
 			Code:  1, // TRAP_BRKPT (breakpoint).
 		}
 		info.SetAddr(switchOpts.Registers.Rip) // Include address.
@@ -348,7 +348,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 		ring0.InvalidTSS,
 		ring0.StackSegmentFault:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGSEGV),
+			Signo: int32(unix.SIGSEGV),
 			Code:  arch.SignalInfoKernel,
 		}
 		info.SetAddr(switchOpts.Registers.Rip) // Include address.
@@ -362,7 +362,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 
 	case ring0.InvalidOpcode:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGILL),
+			Signo: int32(unix.SIGILL),
 			Code:  1, // ILL_ILLOPC (illegal opcode).
 		}
 		info.SetAddr(switchOpts.Registers.Rip) // Include address.
@@ -370,7 +370,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 
 	case ring0.DivideByZero:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGFPE),
+			Signo: int32(unix.SIGFPE),
 			Code:  1, // FPE_INTDIV (divide by zero).
 		}
 		info.SetAddr(switchOpts.Registers.Rip) // Include address.
@@ -378,7 +378,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 
 	case ring0.Overflow:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGFPE),
+			Signo: int32(unix.SIGFPE),
 			Code:  2, // FPE_INTOVF (integer overflow).
 		}
 		info.SetAddr(switchOpts.Registers.Rip) // Include address.
@@ -387,7 +387,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 	case ring0.X87FloatingPointException,
 		ring0.SIMDFloatingPointException:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGFPE),
+			Signo: int32(unix.SIGFPE),
 			Code:  7, // FPE_FLTINV (invalid operation).
 		}
 		info.SetAddr(switchOpts.Registers.Rip) // Include address.
@@ -398,7 +398,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 
 	case ring0.AlignmentCheck:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGBUS),
+			Signo: int32(unix.SIGBUS),
 			Code:  2, // BUS_ADRERR (physical address does not exist).
 		}
 		return usermem.NoAccess, platform.ErrContextSignal
@@ -409,7 +409,7 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 		// really not. This could happen, e.g. if some file is
 		// truncated (and would generate a SIGBUS) and we map it
 		// directly into the instance.
-		return c.fault(int32(syscall.SIGBUS), info)
+		return c.fault(int32(unix.SIGBUS), info)
 
 	case ring0.DeviceNotAvailable,
 		ring0.DoubleFault,
diff --git a/pkg/sentry/platform/kvm/machine_amd64_unsafe.go b/pkg/sentry/platform/kvm/machine_amd64_unsafe.go
index b430f92c6..83bcc7406 100644
--- a/pkg/sentry/platform/kvm/machine_amd64_unsafe.go
+++ b/pkg/sentry/platform/kvm/machine_amd64_unsafe.go
@@ -19,9 +19,9 @@ package kvm
 import (
 	"fmt"
 	"sync/atomic"
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 )
 
@@ -31,15 +31,15 @@ import (
 //
 //go:nosplit
 func (c *vCPU) loadSegments(tid uint64) {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_ARCH_PRCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_ARCH_PRCTL,
 		linux.ARCH_GET_FS,
 		uintptr(unsafe.Pointer(&c.CPU.Registers().Fs_base)),
 		0); errno != 0 {
 		throw("getting FS segment")
 	}
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_ARCH_PRCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_ARCH_PRCTL,
 		linux.ARCH_GET_GS,
 		uintptr(unsafe.Pointer(&c.CPU.Registers().Gs_base)),
 		0); errno != 0 {
@@ -50,8 +50,8 @@ func (c *vCPU) loadSegments(tid uint64) {
 
 // setCPUID sets the CPUID to be used by the guest.
 func (c *vCPU) setCPUID() error {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_CPUID2,
 		uintptr(unsafe.Pointer(&cpuidSupported))); errno != 0 {
@@ -64,8 +64,8 @@ func (c *vCPU) setCPUID() error {
 //
 // If mustSucceed is true, then this function panics on error.
 func (c *vCPU) getTSCFreq() (uintptr, error) {
-	rawFreq, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	rawFreq, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_GET_TSC_KHZ,
 		0 /* ignored */)
@@ -77,8 +77,8 @@ func (c *vCPU) getTSCFreq() (uintptr, error) {
 
 // setTSCFreq sets the TSC frequency.
 func (c *vCPU) setTSCFreq(freq uintptr) error {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_TSC_KHZ,
 		freq /* khz */); errno != 0 {
@@ -95,8 +95,8 @@ func (c *vCPU) setTSC(value uint64) error {
 	}
 	registers.entries[0].index = _MSR_IA32_TSC
 	registers.entries[0].data = value
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_MSRS,
 		uintptr(unsafe.Pointer(&registers))); errno != 0 {
@@ -108,9 +108,9 @@ func (c *vCPU) setTSC(value uint64) error {
 // setUserRegisters sets user registers in the vCPU.
 //
 //go:nosplit
-func (c *vCPU) setUserRegisters(uregs *userRegs) syscall.Errno {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+func (c *vCPU) setUserRegisters(uregs *userRegs) unix.Errno {
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_REGS,
 		uintptr(unsafe.Pointer(uregs))); errno != 0 {
@@ -124,9 +124,9 @@ func (c *vCPU) setUserRegisters(uregs *userRegs) syscall.Errno {
 // This is safe to call from a nosplit context.
 //
 //go:nosplit
-func (c *vCPU) getUserRegisters(uregs *userRegs) syscall.Errno {
-	if _, _, errno := syscall.RawSyscall( // escapes: no.
-		syscall.SYS_IOCTL,
+func (c *vCPU) getUserRegisters(uregs *userRegs) unix.Errno {
+	if _, _, errno := unix.RawSyscall( // escapes: no.
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_GET_REGS,
 		uintptr(unsafe.Pointer(uregs))); errno != 0 {
@@ -137,8 +137,8 @@ func (c *vCPU) getUserRegisters(uregs *userRegs) syscall.Errno {
 
 // setSystemRegisters sets system registers.
 func (c *vCPU) setSystemRegisters(sregs *systemRegs) error {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_SREGS,
 		uintptr(unsafe.Pointer(sregs))); errno != 0 {
@@ -150,9 +150,9 @@ func (c *vCPU) setSystemRegisters(sregs *systemRegs) error {
 // getSystemRegisters sets system registers.
 //
 //go:nosplit
-func (c *vCPU) getSystemRegisters(sregs *systemRegs) syscall.Errno {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+func (c *vCPU) getSystemRegisters(sregs *systemRegs) unix.Errno {
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_GET_SREGS,
 		uintptr(unsafe.Pointer(sregs))); errno != 0 {
diff --git a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
index 78cbd9701..059aa43d0 100644
--- a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
+++ b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
@@ -20,9 +20,9 @@ import (
 	"fmt"
 	"reflect"
 	"sync/atomic"
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/ring0/pagetables"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
@@ -39,8 +39,8 @@ var vcpuInit kvmVcpuInit
 
 // initArchState initializes architecture-specific state.
 func (m *machine) initArchState() error {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(m.fd),
 		_KVM_ARM_PREFERRED_TARGET,
 		uintptr(unsafe.Pointer(&vcpuInit))); errno != 0 {
@@ -62,8 +62,8 @@ func (c *vCPU) initArchState() error {
 	regGet.addr = uint64(reflect.ValueOf(&dataGet).Pointer())
 
 	vcpuInit.features[0] |= (1 << _KVM_ARM_VCPU_PSCI_0_2)
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_ARM_VCPU_INIT,
 		uintptr(unsafe.Pointer(&vcpuInit))); errno != 0 {
@@ -186,8 +186,8 @@ func (c *vCPU) loadSegments(tid uint64) {
 }
 
 func (c *vCPU) setOneRegister(reg *kvmOneReg) error {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_ONE_REG,
 		uintptr(unsafe.Pointer(reg))); errno != 0 {
@@ -197,8 +197,8 @@ func (c *vCPU) setOneRegister(reg *kvmOneReg) error {
 }
 
 func (c *vCPU) getOneRegister(reg *kvmOneReg) error {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_GET_ONE_REG,
 		uintptr(unsafe.Pointer(reg))); errno != 0 {
@@ -211,9 +211,9 @@ func (c *vCPU) getOneRegister(reg *kvmOneReg) error {
 func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo) (usermem.AccessType, error) {
 	// Check for canonical addresses.
 	if regs := switchOpts.Registers; !ring0.IsCanonical(regs.Pc) {
-		return nonCanonical(regs.Pc, int32(syscall.SIGSEGV), info)
+		return nonCanonical(regs.Pc, int32(unix.SIGSEGV), info)
 	} else if !ring0.IsCanonical(regs.Sp) {
-		return nonCanonical(regs.Sp, int32(syscall.SIGSEGV), info)
+		return nonCanonical(regs.Sp, int32(unix.SIGSEGV), info)
 	}
 
 	// Assign PCIDs.
@@ -247,23 +247,23 @@ func (c *vCPU) SwitchToUser(switchOpts ring0.SwitchOpts, info *arch.SignalInfo)
 		// Fast path: system call executed.
 		return usermem.NoAccess, nil
 	case ring0.PageFault:
-		return c.fault(int32(syscall.SIGSEGV), info)
+		return c.fault(int32(unix.SIGSEGV), info)
 	case ring0.El0ErrNMI:
-		return c.fault(int32(syscall.SIGBUS), info)
+		return c.fault(int32(unix.SIGBUS), info)
 	case ring0.Vector(bounce): // ring0.VirtualizationException.
 		return usermem.NoAccess, platform.ErrContextInterrupt
 	case ring0.El0SyncUndef:
-		return c.fault(int32(syscall.SIGILL), info)
+		return c.fault(int32(unix.SIGILL), info)
 	case ring0.El0SyncDbg:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGTRAP),
+			Signo: int32(unix.SIGTRAP),
 			Code:  1, // TRAP_BRKPT (breakpoint).
 		}
 		info.SetAddr(switchOpts.Registers.Pc) // Include address.
 		return usermem.AccessType{}, platform.ErrContextSignal
 	case ring0.El0SyncSpPc:
 		*info = arch.SignalInfo{
-			Signo: int32(syscall.SIGBUS),
+			Signo: int32(unix.SIGBUS),
 			Code:  2, // BUS_ADRERR (physical address does not exist).
 		}
 		return usermem.NoAccess, platform.ErrContextSignal
diff --git a/pkg/sentry/platform/kvm/machine_unsafe.go b/pkg/sentry/platform/kvm/machine_unsafe.go
index c322551d2..49e1c7136 100644
--- a/pkg/sentry/platform/kvm/machine_unsafe.go
+++ b/pkg/sentry/platform/kvm/machine_unsafe.go
@@ -23,9 +23,9 @@ import (
 	"fmt"
 	"math"
 	"sync/atomic"
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 )
 
@@ -41,7 +41,7 @@ func exitsyscall()
 // directly (instead of wrapping in an error) to avoid allocations.
 //
 //go:nosplit
-func (m *machine) setMemoryRegion(slot int, physical, length, virtual uintptr, flags uint32) syscall.Errno {
+func (m *machine) setMemoryRegion(slot int, physical, length, virtual uintptr, flags uint32) unix.Errno {
 	userRegion := userMemoryRegion{
 		slot:          uint32(slot),
 		flags:         uint32(flags),
@@ -51,8 +51,8 @@ func (m *machine) setMemoryRegion(slot int, physical, length, virtual uintptr, f
 	}
 
 	// Set the region.
-	_, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	_, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(m.fd),
 		_KVM_SET_USER_MEMORY_REGION,
 		uintptr(unsafe.Pointer(&userRegion)))
@@ -61,12 +61,12 @@ func (m *machine) setMemoryRegion(slot int, physical, length, virtual uintptr, f
 
 // mapRunData maps the vCPU run data.
 func mapRunData(fd int) (*runData, error) {
-	r, _, errno := syscall.RawSyscall6(
-		syscall.SYS_MMAP,
+	r, _, errno := unix.RawSyscall6(
+		unix.SYS_MMAP,
 		0,
 		uintptr(runDataSize),
-		syscall.PROT_READ|syscall.PROT_WRITE,
-		syscall.MAP_SHARED,
+		unix.PROT_READ|unix.PROT_WRITE,
+		unix.MAP_SHARED,
 		uintptr(fd),
 		0)
 	if errno != 0 {
@@ -77,8 +77,8 @@ func mapRunData(fd int) (*runData, error) {
 
 // unmapRunData unmaps the vCPU run data.
 func unmapRunData(r *runData) error {
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_MUNMAP,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_MUNMAP,
 		uintptr(unsafe.Pointer(r)),
 		uintptr(runDataSize),
 		0); errno != 0 {
@@ -115,8 +115,8 @@ func (a *atomicAddressSpace) get() *addressSpace {
 //
 //go:nosplit
 func (c *vCPU) notify() {
-	_, _, errno := syscall.RawSyscall6( // escapes: no.
-		syscall.SYS_FUTEX,
+	_, _, errno := unix.RawSyscall6( // escapes: no.
+		unix.SYS_FUTEX,
 		uintptr(unsafe.Pointer(&c.state)),
 		linux.FUTEX_WAKE|linux.FUTEX_PRIVATE_FLAG,
 		math.MaxInt32, // Number of waiters.
@@ -133,13 +133,13 @@ func (c *vCPU) notify() {
 //
 // This panics on error.
 func (c *vCPU) waitUntilNot(state uint32) {
-	_, _, errno := syscall.Syscall6(
-		syscall.SYS_FUTEX,
+	_, _, errno := unix.Syscall6(
+		unix.SYS_FUTEX,
 		uintptr(unsafe.Pointer(&c.state)),
 		linux.FUTEX_WAIT|linux.FUTEX_PRIVATE_FLAG,
 		uintptr(state),
 		0, 0, 0)
-	if errno != 0 && errno != syscall.EINTR && errno != syscall.EAGAIN {
+	if errno != 0 && errno != unix.EINTR && errno != unix.EAGAIN {
 		panic("futex wait error")
 	}
 }
@@ -159,8 +159,8 @@ func (c *vCPU) setSignalMask() error {
 	data.length = 8 // Fixed sigset size.
 	data.mask1 = ^uint32(bounceSignalMask & 0xffffffff)
 	data.mask2 = ^uint32(bounceSignalMask >> 32)
-	if _, _, errno := syscall.RawSyscall(
-		syscall.SYS_IOCTL,
+	if _, _, errno := unix.RawSyscall(
+		unix.SYS_IOCTL,
 		uintptr(c.fd),
 		_KVM_SET_SIGNAL_MASK,
 		uintptr(unsafe.Pointer(&data))); errno != 0 {
diff --git a/pkg/sentry/platform/kvm/physical_map.go b/pkg/sentry/platform/kvm/physical_map.go
index 8bdec93ae..7376d8b8d 100644
--- a/pkg/sentry/platform/kvm/physical_map.go
+++ b/pkg/sentry/platform/kvm/physical_map.go
@@ -17,8 +17,8 @@ package kvm
 import (
 	"fmt"
 	"sort"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/ring0"
 	"gvisor.dev/gvisor/pkg/usermem"
@@ -90,12 +90,12 @@ func fillAddressSpace() (excludedRegions []region) {
 	required := uintptr(requiredAddr)
 	current := required // Attempted mmap size.
 	for filled := uintptr(0); filled < required && current > 0; {
-		addr, _, errno := syscall.RawSyscall6(
-			syscall.SYS_MMAP,
+		addr, _, errno := unix.RawSyscall6(
+			unix.SYS_MMAP,
 			0, // Suggested address.
 			current,
-			syscall.PROT_NONE,
-			syscall.MAP_ANONYMOUS|syscall.MAP_PRIVATE|syscall.MAP_NORESERVE,
+			unix.PROT_NONE,
+			unix.MAP_ANONYMOUS|unix.MAP_PRIVATE|unix.MAP_NORESERVE,
 			0, 0)
 		if errno != 0 {
 			// Attempt half the size; overflow not possible.
diff --git a/pkg/sentry/platform/ptrace/filters.go b/pkg/sentry/platform/ptrace/filters.go
index 20fc62acb..ba4503b0d 100644
--- a/pkg/sentry/platform/ptrace/filters.go
+++ b/pkg/sentry/platform/ptrace/filters.go
@@ -15,16 +15,15 @@
 package ptrace
 
 import (
-	"syscall"
-
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/seccomp"
 )
 
 // SyscallFilters returns syscalls made exclusively by the ptrace platform.
 func (*PTrace) SyscallFilters() seccomp.SyscallRules {
 	return seccomp.SyscallRules{
-		syscall.SYS_PTRACE: {},
-		syscall.SYS_TGKILL: {},
-		syscall.SYS_WAIT4:  {},
+		unix.SYS_PTRACE: {},
+		unix.SYS_TGKILL: {},
+		unix.SYS_WAIT4:  {},
 	}
 }
diff --git a/pkg/sentry/platform/ptrace/ptrace_arm64_unsafe.go b/pkg/sentry/platform/ptrace/ptrace_arm64_unsafe.go
index 32b8a6be9..4f7fe993a 100644
--- a/pkg/sentry/platform/ptrace/ptrace_arm64_unsafe.go
+++ b/pkg/sentry/platform/ptrace/ptrace_arm64_unsafe.go
@@ -17,21 +17,21 @@
 package ptrace
 
 import (
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 )
 
 // getTLS gets the thread local storage register.
 func (t *thread) getTLS(tls *uint64) error {
-	iovec := syscall.Iovec{
+	iovec := unix.Iovec{
 		Base: (*byte)(unsafe.Pointer(tls)),
 		Len:  uint64(unsafe.Sizeof(*tls)),
 	}
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_GETREGSET,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_GETREGSET,
 		uintptr(t.tid),
 		linux.NT_ARM_TLS,
 		uintptr(unsafe.Pointer(&iovec)),
@@ -44,13 +44,13 @@ func (t *thread) getTLS(tls *uint64) error {
 
 // setTLS sets the thread local storage register.
 func (t *thread) setTLS(tls *uint64) error {
-	iovec := syscall.Iovec{
+	iovec := unix.Iovec{
 		Base: (*byte)(unsafe.Pointer(tls)),
 		Len:  uint64(unsafe.Sizeof(*tls)),
 	}
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_SETREGSET,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_SETREGSET,
 		uintptr(t.tid),
 		linux.NT_ARM_TLS,
 		uintptr(unsafe.Pointer(&iovec)),
diff --git a/pkg/sentry/platform/ptrace/ptrace_unsafe.go b/pkg/sentry/platform/ptrace/ptrace_unsafe.go
index 8b72d24e8..2c21f946e 100644
--- a/pkg/sentry/platform/ptrace/ptrace_unsafe.go
+++ b/pkg/sentry/platform/ptrace/ptrace_unsafe.go
@@ -15,9 +15,9 @@
 package ptrace
 
 import (
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/usermem"
@@ -25,13 +25,13 @@ import (
 
 // getRegs gets the general purpose register set.
 func (t *thread) getRegs(regs *arch.Registers) error {
-	iovec := syscall.Iovec{
+	iovec := unix.Iovec{
 		Base: (*byte)(unsafe.Pointer(regs)),
 		Len:  uint64(unsafe.Sizeof(*regs)),
 	}
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_GETREGSET,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_GETREGSET,
 		uintptr(t.tid),
 		linux.NT_PRSTATUS,
 		uintptr(unsafe.Pointer(&iovec)),
@@ -44,13 +44,13 @@ func (t *thread) getRegs(regs *arch.Registers) error {
 
 // setRegs sets the general purpose register set.
 func (t *thread) setRegs(regs *arch.Registers) error {
-	iovec := syscall.Iovec{
+	iovec := unix.Iovec{
 		Base: (*byte)(unsafe.Pointer(regs)),
 		Len:  uint64(unsafe.Sizeof(*regs)),
 	}
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_SETREGSET,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_SETREGSET,
 		uintptr(t.tid),
 		linux.NT_PRSTATUS,
 		uintptr(unsafe.Pointer(&iovec)),
@@ -61,15 +61,15 @@ func (t *thread) setRegs(regs *arch.Registers) error {
 	return nil
 }
 
-// getFPRegs gets the floating-point data via the GETREGSET ptrace syscall.
+// getFPRegs gets the floating-point data via the GETREGSET ptrace unix.
 func (t *thread) getFPRegs(fpState *arch.FloatingPointData, fpLen uint64, useXsave bool) error {
-	iovec := syscall.Iovec{
+	iovec := unix.Iovec{
 		Base: (*byte)(fpState),
 		Len:  fpLen,
 	}
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_GETREGSET,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_GETREGSET,
 		uintptr(t.tid),
 		fpRegSet(useXsave),
 		uintptr(unsafe.Pointer(&iovec)),
@@ -80,15 +80,15 @@ func (t *thread) getFPRegs(fpState *arch.FloatingPointData, fpLen uint64, useXsa
 	return nil
 }
 
-// setFPRegs sets the floating-point data via the SETREGSET ptrace syscall.
+// setFPRegs sets the floating-point data via the SETREGSET ptrace unix.
 func (t *thread) setFPRegs(fpState *arch.FloatingPointData, fpLen uint64, useXsave bool) error {
-	iovec := syscall.Iovec{
+	iovec := unix.Iovec{
 		Base: (*byte)(fpState),
 		Len:  fpLen,
 	}
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_SETREGSET,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_SETREGSET,
 		uintptr(t.tid),
 		fpRegSet(useXsave),
 		uintptr(unsafe.Pointer(&iovec)),
@@ -101,9 +101,9 @@ func (t *thread) setFPRegs(fpState *arch.FloatingPointData, fpLen uint64, useXsa
 
 // getSignalInfo retrieves information about the signal that caused the stop.
 func (t *thread) getSignalInfo(si *arch.SignalInfo) error {
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_GETSIGINFO,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_GETSIGINFO,
 		uintptr(t.tid),
 		0,
 		uintptr(unsafe.Pointer(si)),
@@ -123,18 +123,18 @@ func (t *thread) getSignalInfo(si *arch.SignalInfo) error {
 func (t *thread) clone() (*thread, error) {
 	r, ok := usermem.Addr(stackPointer(&t.initRegs)).RoundUp()
 	if !ok {
-		return nil, syscall.EINVAL
+		return nil, unix.EINVAL
 	}
 	rval, err := t.syscallIgnoreInterrupt(
 		&t.initRegs,
-		syscall.SYS_CLONE,
+		unix.SYS_CLONE,
 		arch.SyscallArgument{Value: uintptr(
-			syscall.CLONE_FILES |
-				syscall.CLONE_FS |
-				syscall.CLONE_SIGHAND |
-				syscall.CLONE_THREAD |
-				syscall.CLONE_PTRACE |
-				syscall.CLONE_VM)},
+			unix.CLONE_FILES |
+				unix.CLONE_FS |
+				unix.CLONE_SIGHAND |
+				unix.CLONE_THREAD |
+				unix.CLONE_PTRACE |
+				unix.CLONE_VM)},
 		// The stack pointer is just made up, but we have it be
 		// something sensible so the kernel doesn't think we're
 		// up to no good. Which we are.
@@ -158,9 +158,9 @@ func (t *thread) clone() (*thread, error) {
 // getEventMessage retrieves a message about the ptrace event that just happened.
 func (t *thread) getEventMessage() (uintptr, error) {
 	var msg uintptr
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_GETEVENTMSG,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_GETEVENTMSG,
 		uintptr(t.tid),
 		0,
 		uintptr(unsafe.Pointer(&msg)),
diff --git a/pkg/sentry/platform/ptrace/stub_unsafe.go b/pkg/sentry/platform/ptrace/stub_unsafe.go
index 341dde143..780227248 100644
--- a/pkg/sentry/platform/ptrace/stub_unsafe.go
+++ b/pkg/sentry/platform/ptrace/stub_unsafe.go
@@ -16,9 +16,9 @@ package ptrace
 
 import (
 	"reflect"
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/safecopy"
 	"gvisor.dev/gvisor/pkg/usermem"
 )
@@ -56,17 +56,17 @@ func stubInit() {
 		// something that may have been there already. We just walk
 		// down the address space until we find a place where the stub
 		// can be placed.
-		addr, _, errno := syscall.RawSyscall6(
-			syscall.SYS_MMAP,
+		addr, _, errno := unix.RawSyscall6(
+			unix.SYS_MMAP,
 			stubStart,
 			mapLen,
-			syscall.PROT_WRITE|syscall.PROT_READ,
-			syscall.MAP_PRIVATE|syscall.MAP_ANONYMOUS,
+			unix.PROT_WRITE|unix.PROT_READ,
+			unix.MAP_PRIVATE|unix.MAP_ANONYMOUS,
 			0 /* fd */, 0 /* offset */)
 		if addr != stubStart || errno != 0 {
 			if addr != 0 {
 				// Unmap the region we've mapped accidentally.
-				syscall.RawSyscall(syscall.SYS_MUNMAP, addr, mapLen, 0)
+				unix.RawSyscall(unix.SYS_MUNMAP, addr, mapLen, 0)
 			}
 
 			// Attempt to begin at a lower address.
@@ -79,11 +79,11 @@ func stubInit() {
 		copy(targetSlice, stubSlice)
 
 		// Make the stub executable.
-		if _, _, errno := syscall.RawSyscall(
-			syscall.SYS_MPROTECT,
+		if _, _, errno := unix.RawSyscall(
+			unix.SYS_MPROTECT,
 			stubStart,
 			mapLen,
-			syscall.PROT_EXEC|syscall.PROT_READ); errno != 0 {
+			unix.PROT_EXEC|unix.PROT_READ); errno != 0 {
 			panic("mprotect failed: " + errno.Error())
 		}
 
diff --git a/pkg/sentry/platform/ptrace/subprocess.go b/pkg/sentry/platform/ptrace/subprocess.go
index 17fb0a0d8..acccbfe2e 100644
--- a/pkg/sentry/platform/ptrace/subprocess.go
+++ b/pkg/sentry/platform/ptrace/subprocess.go
@@ -18,7 +18,6 @@ import (
 	"fmt"
 	"os"
 	"runtime"
-	"syscall"
 
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/log"
@@ -35,9 +34,9 @@ import (
 //
 // These constants are only used in subprocess.go.
 const (
-	ERESTARTSYS    = syscall.Errno(512)
-	ERESTARTNOINTR = syscall.Errno(513)
-	ERESTARTNOHAND = syscall.Errno(514)
+	ERESTARTSYS    = unix.Errno(512)
+	ERESTARTNOINTR = unix.Errno(513)
+	ERESTARTNOHAND = unix.Errno(514)
 )
 
 // globalPool exists to solve two distinct problems:
@@ -96,7 +95,7 @@ func (tp *threadPool) lookupOrCreate(currentTID int32, newThread func() *thread)
 		// threads never exiting.
 		for origTID, t := range tp.threads {
 			// Signal zero is an easy existence check.
-			if err := syscall.Tgkill(syscall.Getpid(), int(origTID), 0); err != nil {
+			if err := unix.Tgkill(unix.Getpid(), int(origTID), 0); err != nil {
 				// This thread has been abandoned; reuse it.
 				delete(tp.threads, origTID)
 				tp.threads[currentTID] = t
@@ -186,7 +185,7 @@ func newSubprocess(create func() (*thread, error)) (*subprocess, error) {
 			// (Hopefully nobody tgkilled it with a signal <
 			// SIGSTOP before the SIGSTOP was delivered, in which
 			// case that signal would be delivered before SIGSTOP.)
-			if sig := t.wait(stopped); sig != syscall.SIGSTOP {
+			if sig := t.wait(stopped); sig != unix.SIGSTOP {
 				panic(fmt.Sprintf("error waiting for new clone: expected SIGSTOP, got %v", sig))
 			}
 
@@ -269,7 +268,7 @@ func (s *subprocess) newThread() *thread {
 
 // attach attaches to the thread.
 func (t *thread) attach() {
-	if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, syscall.PTRACE_ATTACH, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
+	if _, _, errno := unix.RawSyscall6(unix.SYS_PTRACE, unix.PTRACE_ATTACH, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 		panic(fmt.Sprintf("unable to attach: %v", errno))
 	}
 
@@ -277,7 +276,7 @@ func (t *thread) attach() {
 	// stopped from the SIGSTOP queued by CLONE_PTRACE (see inner loop of
 	// newSubprocess), so we always expect to see signal-delivery-stop with
 	// SIGSTOP.
-	if sig := t.wait(stopped); sig != syscall.SIGSTOP {
+	if sig := t.wait(stopped); sig != unix.SIGSTOP {
 		panic(fmt.Sprintf("wait failed: expected SIGSTOP, got %v", sig))
 	}
 
@@ -301,7 +300,7 @@ func (t *thread) grabInitRegs() {
 //
 // Because the SIGSTOP is not suppressed, the thread will enter group-stop.
 func (t *thread) detach() {
-	if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, syscall.PTRACE_DETACH, uintptr(t.tid), 0, uintptr(syscall.SIGSTOP), 0, 0); errno != 0 {
+	if _, _, errno := unix.RawSyscall6(unix.SYS_PTRACE, unix.PTRACE_DETACH, uintptr(t.tid), 0, uintptr(unix.SIGSTOP), 0, 0); errno != 0 {
 		panic(fmt.Sprintf("can't detach new clone: %v", errno))
 	}
 }
@@ -331,14 +330,14 @@ func (t *thread) dumpAndPanic(message string) {
 
 func (t *thread) unexpectedStubExit() {
 	msg, err := t.getEventMessage()
-	status := syscall.WaitStatus(msg)
-	if status.Signaled() && status.Signal() == syscall.SIGKILL {
+	status := unix.WaitStatus(msg)
+	if status.Signaled() && status.Signal() == unix.SIGKILL {
 		// SIGKILL can be only sent by a user or OOM-killer. In both
 		// these cases, we don't need to panic. There is no reasons to
 		// think that something wrong in gVisor.
 		log.Warningf("The ptrace stub process %v has been killed by SIGKILL.", t.tgid)
 		pid := os.Getpid()
-		syscall.Tgkill(pid, pid, syscall.Signal(syscall.SIGKILL))
+		unix.Tgkill(pid, pid, unix.Signal(unix.SIGKILL))
 	}
 	t.dumpAndPanic(fmt.Sprintf("wait failed: the process %d:%d exited: %x (err %v)", t.tgid, t.tid, msg, err))
 }
@@ -346,12 +345,12 @@ func (t *thread) unexpectedStubExit() {
 // wait waits for a stop event.
 //
 // Precondition: outcome is a valid waitOutcome.
-func (t *thread) wait(outcome waitOutcome) syscall.Signal {
-	var status syscall.WaitStatus
+func (t *thread) wait(outcome waitOutcome) unix.Signal {
+	var status unix.WaitStatus
 
 	for {
-		r, err := syscall.Wait4(int(t.tid), &status, syscall.WALL|syscall.WUNTRACED, nil)
-		if err == syscall.EINTR || err == syscall.EAGAIN {
+		r, err := unix.Wait4(int(t.tid), &status, unix.WALL|unix.WUNTRACED, nil)
+		if err == unix.EINTR || err == unix.EAGAIN {
 			// Wait was interrupted; wait again.
 			continue
 		} else if err != nil {
@@ -369,12 +368,12 @@ func (t *thread) wait(outcome waitOutcome) syscall.Signal {
 			if stopSig == 0 {
 				continue // Spurious stop.
 			}
-			if stopSig == syscall.SIGTRAP {
-				if status.TrapCause() == syscall.PTRACE_EVENT_EXIT {
+			if stopSig == unix.SIGTRAP {
+				if status.TrapCause() == unix.PTRACE_EVENT_EXIT {
 					t.unexpectedStubExit()
 				}
 				// Re-encode the trap cause the way it's expected.
-				return stopSig | syscall.Signal(status.TrapCause()<<8)
+				return stopSig | unix.Signal(status.TrapCause()<<8)
 			}
 			// Not a trap signal.
 			return stopSig
@@ -382,7 +381,7 @@ func (t *thread) wait(outcome waitOutcome) syscall.Signal {
 			if !status.Exited() && !status.Signaled() {
 				t.dumpAndPanic(fmt.Sprintf("ptrace status unexpected: got %v, wanted exited", status))
 			}
-			return syscall.Signal(status.ExitStatus())
+			return unix.Signal(status.ExitStatus())
 		default:
 			// Should not happen.
 			t.dumpAndPanic(fmt.Sprintf("unknown outcome: %v", outcome))
@@ -397,7 +396,7 @@ func (t *thread) wait(outcome waitOutcome) syscall.Signal {
 // manually created threads.
 func (t *thread) destroy() {
 	t.detach()
-	syscall.Tgkill(int(t.tgid), int(t.tid), syscall.Signal(syscall.SIGKILL))
+	unix.Tgkill(int(t.tgid), int(t.tid), unix.Signal(unix.SIGKILL))
 	t.wait(killed)
 }
 
@@ -407,12 +406,12 @@ func (t *thread) init() {
 	// set PTRACE_O_EXITKILL to ensure that the unexpected exit of the
 	// sentry will immediately kill the associated stubs.
 	const PTRACE_O_EXITKILL = 0x100000
-	_, _, errno := syscall.RawSyscall6(
-		syscall.SYS_PTRACE,
-		syscall.PTRACE_SETOPTIONS,
+	_, _, errno := unix.RawSyscall6(
+		unix.SYS_PTRACE,
+		unix.PTRACE_SETOPTIONS,
 		uintptr(t.tid),
 		0,
-		syscall.PTRACE_O_TRACESYSGOOD|syscall.PTRACE_O_TRACEEXIT|PTRACE_O_EXITKILL,
+		unix.PTRACE_O_TRACESYSGOOD|unix.PTRACE_O_TRACEEXIT|PTRACE_O_EXITKILL,
 		0, 0)
 	if errno != 0 {
 		panic(fmt.Sprintf("ptrace set options failed: %v", errno))
@@ -434,17 +433,17 @@ func (t *thread) syscall(regs *arch.Registers) (uintptr, error) {
 		// Execute the syscall instruction. The task has to stop on the
 		// trap instruction which is right after the syscall
 		// instruction.
-		if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, syscall.PTRACE_CONT, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
+		if _, _, errno := unix.RawSyscall6(unix.SYS_PTRACE, unix.PTRACE_CONT, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 			panic(fmt.Sprintf("ptrace syscall-enter failed: %v", errno))
 		}
 
 		sig := t.wait(stopped)
-		if sig == syscall.SIGTRAP {
+		if sig == unix.SIGTRAP {
 			// Reached syscall-enter-stop.
 			break
 		} else {
 			// Some other signal caused a thread stop; ignore.
-			if sig != syscall.SIGSTOP && sig != syscall.SIGCHLD {
+			if sig != unix.SIGSTOP && sig != unix.SIGCHLD {
 				log.Warningf("The thread %d:%d has been interrupted by %d", t.tgid, t.tid, sig)
 			}
 			continue
@@ -483,7 +482,7 @@ func (t *thread) syscallIgnoreInterrupt(
 
 // NotifyInterrupt implements interrupt.Receiver.NotifyInterrupt.
 func (t *thread) NotifyInterrupt() {
-	syscall.Tgkill(int(t.tgid), int(t.tid), syscall.Signal(platform.SignalInterrupt))
+	unix.Tgkill(int(t.tgid), int(t.tid), unix.Signal(platform.SignalInterrupt))
 }
 
 // switchToApp is called from the main SwitchToApp entrypoint.
@@ -532,15 +531,15 @@ func (s *subprocess) switchToApp(c *context, ac arch.Context) bool {
 	for {
 		// Start running until the next system call.
 		if isSingleStepping(regs) {
-			if _, _, errno := syscall.RawSyscall6(
-				syscall.SYS_PTRACE,
+			if _, _, errno := unix.RawSyscall6(
+				unix.SYS_PTRACE,
 				unix.PTRACE_SYSEMU_SINGLESTEP,
 				uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 				panic(fmt.Sprintf("ptrace sysemu failed: %v", errno))
 			}
 		} else {
-			if _, _, errno := syscall.RawSyscall6(
-				syscall.SYS_PTRACE,
+			if _, _, errno := unix.RawSyscall6(
+				unix.SYS_PTRACE,
 				unix.PTRACE_SYSEMU,
 				uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 				panic(fmt.Sprintf("ptrace sysemu failed: %v", errno))
@@ -550,7 +549,7 @@ func (s *subprocess) switchToApp(c *context, ac arch.Context) bool {
 		// Wait for the syscall-enter stop.
 		sig := t.wait(stopped)
 
-		if sig == syscall.SIGSTOP {
+		if sig == unix.SIGSTOP {
 			// SIGSTOP was delivered to another thread in the same thread
 			// group, which initiated another group stop. Just ignore it.
 			continue
@@ -571,7 +570,7 @@ func (s *subprocess) switchToApp(c *context, ac arch.Context) bool {
 		}
 
 		// Is it a system call?
-		if sig == (syscallEvent | syscall.SIGTRAP) {
+		if sig == (syscallEvent | unix.SIGTRAP) {
 			s.arm64SyscallWorkaround(t, regs)
 
 			// Ensure registers are sane.
@@ -619,14 +618,14 @@ func (s *subprocess) syscall(sysno uintptr, args ...arch.SyscallArgument) (uintp
 func (s *subprocess) MapFile(addr usermem.Addr, f memmap.File, fr memmap.FileRange, at usermem.AccessType, precommit bool) error {
 	var flags int
 	if precommit {
-		flags |= syscall.MAP_POPULATE
+		flags |= unix.MAP_POPULATE
 	}
 	_, err := s.syscall(
-		syscall.SYS_MMAP,
+		unix.SYS_MMAP,
 		arch.SyscallArgument{Value: uintptr(addr)},
 		arch.SyscallArgument{Value: uintptr(fr.Length())},
 		arch.SyscallArgument{Value: uintptr(at.Prot())},
-		arch.SyscallArgument{Value: uintptr(flags | syscall.MAP_SHARED | syscall.MAP_FIXED)},
+		arch.SyscallArgument{Value: uintptr(flags | unix.MAP_SHARED | unix.MAP_FIXED)},
 		arch.SyscallArgument{Value: uintptr(f.FD())},
 		arch.SyscallArgument{Value: uintptr(fr.Start)})
 	return err
@@ -653,7 +652,7 @@ func (s *subprocess) Unmap(addr usermem.Addr, length uint64) {
 	}
 	s.mu.Unlock()
 	_, err := s.syscall(
-		syscall.SYS_MUNMAP,
+		unix.SYS_MUNMAP,
 		arch.SyscallArgument{Value: uintptr(addr)},
 		arch.SyscallArgument{Value: uintptr(length)})
 	if err != nil {
diff --git a/pkg/sentry/platform/ptrace/subprocess_amd64.go b/pkg/sentry/platform/ptrace/subprocess_amd64.go
index 04815282b..9252c0bd7 100644
--- a/pkg/sentry/platform/ptrace/subprocess_amd64.go
+++ b/pkg/sentry/platform/ptrace/subprocess_amd64.go
@@ -19,7 +19,6 @@ package ptrace
 import (
 	"fmt"
 	"strings"
-	"syscall"
 
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
@@ -96,7 +95,7 @@ func updateSyscallRegs(regs *arch.Registers) {
 func syscallReturnValue(regs *arch.Registers) (uintptr, error) {
 	rval := int64(regs.Rax)
 	if rval < 0 {
-		return 0, syscall.Errno(-rval)
+		return 0, unix.Errno(-rval)
 	}
 	return uintptr(rval), nil
 }
@@ -179,7 +178,7 @@ func patchSignalInfo(regs *arch.Registers, signalInfo *arch.SignalInfo) {
 //
 //go:nosplit
 func enableCpuidFault() {
-	syscall.RawSyscall6(syscall.SYS_ARCH_PRCTL, linux.ARCH_SET_CPUID, 0, 0, 0, 0, 0)
+	unix.RawSyscall6(unix.SYS_ARCH_PRCTL, linux.ARCH_SET_CPUID, 0, 0, 0, 0, 0)
 }
 
 // appendArchSeccompRules append architecture specific seccomp rules when creating BPF program.
@@ -189,9 +188,9 @@ func appendArchSeccompRules(rules []seccomp.RuleSet, defaultAction linux.BPFActi
 		// Rules for trapping vsyscall access.
 		seccomp.RuleSet{
 			Rules: seccomp.SyscallRules{
-				syscall.SYS_GETTIMEOFDAY: {},
-				syscall.SYS_TIME:         {},
-				unix.SYS_GETCPU:          {}, // SYS_GETCPU was not defined in package syscall on amd64.
+				unix.SYS_GETTIMEOFDAY: {},
+				unix.SYS_TIME:         {},
+				unix.SYS_GETCPU:       {}, // SYS_GETCPU was not defined in package syscall on amd64.
 			},
 			Action:   linux.SECCOMP_RET_TRAP,
 			Vsyscall: true,
@@ -200,7 +199,7 @@ func appendArchSeccompRules(rules []seccomp.RuleSet, defaultAction linux.BPFActi
 		rules = append(rules,
 			seccomp.RuleSet{
 				Rules: seccomp.SyscallRules{
-					syscall.SYS_ARCH_PRCTL: []seccomp.Rule{
+					unix.SYS_ARCH_PRCTL: []seccomp.Rule{
 						{seccomp.EqualTo(linux.ARCH_SET_CPUID), seccomp.EqualTo(0)},
 					},
 				},
@@ -227,19 +226,19 @@ func probeSeccomp() bool {
 
 	// Set registers to the yield system call. This call is not allowed
 	// by the filters specified in the attachThread function.
-	regs := createSyscallRegs(&t.initRegs, syscall.SYS_SCHED_YIELD)
+	regs := createSyscallRegs(&t.initRegs, unix.SYS_SCHED_YIELD)
 	if err := t.setRegs(&regs); err != nil {
 		panic(fmt.Sprintf("ptrace set regs failed: %v", err))
 	}
 
 	for {
 		// Attempt an emulation.
-		if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, unix.PTRACE_SYSEMU, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
+		if _, _, errno := unix.RawSyscall6(unix.SYS_PTRACE, unix.PTRACE_SYSEMU, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 			panic(fmt.Sprintf("ptrace syscall-enter failed: %v", errno))
 		}
 
 		sig := t.wait(stopped)
-		if sig == (syscallEvent | syscall.SIGTRAP) {
+		if sig == (syscallEvent | unix.SIGTRAP) {
 			// Did the seccomp errno hook already run? This would
 			// indicate that seccomp is first in line and we're
 			// less than 4.8.
diff --git a/pkg/sentry/platform/ptrace/subprocess_arm64.go b/pkg/sentry/platform/ptrace/subprocess_arm64.go
index 416132967..c0cbc0686 100644
--- a/pkg/sentry/platform/ptrace/subprocess_arm64.go
+++ b/pkg/sentry/platform/ptrace/subprocess_arm64.go
@@ -19,7 +19,6 @@ package ptrace
 import (
 	"fmt"
 	"strings"
-	"syscall"
 
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
@@ -99,7 +98,7 @@ func updateSyscallRegs(regs *arch.Registers) {
 func syscallReturnValue(regs *arch.Registers) (uintptr, error) {
 	rval := int64(regs.Regs[0])
 	if rval < 0 {
-		return 0, syscall.Errno(-rval)
+		return 0, unix.Errno(-rval)
 	}
 	return uintptr(rval), nil
 }
@@ -185,8 +184,8 @@ func (s *subprocess) arm64SyscallWorkaround(t *thread, regs *arch.Registers) {
 	// signal, resume a stub thread and catch it on a signal handling.
 	t.NotifyInterrupt()
 	for {
-		if _, _, errno := syscall.RawSyscall6(
-			syscall.SYS_PTRACE,
+		if _, _, errno := unix.RawSyscall6(
+			unix.SYS_PTRACE,
 			unix.PTRACE_SYSEMU,
 			uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 			panic(fmt.Sprintf("ptrace sysemu failed: %v", errno))
@@ -194,12 +193,12 @@ func (s *subprocess) arm64SyscallWorkaround(t *thread, regs *arch.Registers) {
 
 		// Wait for the syscall-enter stop.
 		sig := t.wait(stopped)
-		if sig == syscall.SIGSTOP {
+		if sig == unix.SIGSTOP {
 			// SIGSTOP was delivered to another thread in the same thread
 			// group, which initiated another group stop. Just ignore it.
 			continue
 		}
-		if sig == (syscallEvent | syscall.SIGTRAP) {
+		if sig == (syscallEvent | unix.SIGTRAP) {
 			t.dumpAndPanic(fmt.Sprintf("unexpected syscall event"))
 		}
 		break
diff --git a/pkg/sentry/platform/ptrace/subprocess_linux.go b/pkg/sentry/platform/ptrace/subprocess_linux.go
index 8548853da..4f0260432 100644
--- a/pkg/sentry/platform/ptrace/subprocess_linux.go
+++ b/pkg/sentry/platform/ptrace/subprocess_linux.go
@@ -18,8 +18,8 @@ package ptrace
 
 import (
 	"fmt"
-	"syscall"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/log"
 	"gvisor.dev/gvisor/pkg/procid"
@@ -27,7 +27,7 @@ import (
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 )
 
-const syscallEvent syscall.Signal = 0x80
+const syscallEvent unix.Signal = 0x80
 
 // createStub creates a fresh stub processes.
 //
@@ -63,7 +63,7 @@ func createStub() (*thread, error) {
 	//
 	// In addition, we set the PTRACE_O_TRACEEXIT option to log more
 	// information about a stub process when it receives a fatal signal.
-	return attachedThread(uintptr(syscall.SIGKILL)|syscall.CLONE_FILES, defaultAction)
+	return attachedThread(uintptr(unix.SIGKILL)|unix.CLONE_FILES, defaultAction)
 }
 
 // attachedThread returns a new attached thread.
@@ -78,38 +78,38 @@ func attachedThread(flags uintptr, defaultAction linux.BPFAction) (*thread, erro
 	if defaultAction != linux.SECCOMP_RET_ALLOW {
 		rules = append(rules, seccomp.RuleSet{
 			Rules: seccomp.SyscallRules{
-				syscall.SYS_CLONE: []seccomp.Rule{
+				unix.SYS_CLONE: []seccomp.Rule{
 					// Allow creation of new subprocesses (used by the master).
-					{seccomp.EqualTo(syscall.CLONE_FILES | syscall.SIGKILL)},
+					{seccomp.EqualTo(unix.CLONE_FILES | unix.SIGKILL)},
 					// Allow creation of new threads within a single address space (used by addresss spaces).
 					{seccomp.EqualTo(
-						syscall.CLONE_FILES |
-							syscall.CLONE_FS |
-							syscall.CLONE_SIGHAND |
-							syscall.CLONE_THREAD |
-							syscall.CLONE_PTRACE |
-							syscall.CLONE_VM)},
+						unix.CLONE_FILES |
+							unix.CLONE_FS |
+							unix.CLONE_SIGHAND |
+							unix.CLONE_THREAD |
+							unix.CLONE_PTRACE |
+							unix.CLONE_VM)},
 				},
 
 				// For the initial process creation.
-				syscall.SYS_WAIT4: {},
-				syscall.SYS_EXIT:  {},
+				unix.SYS_WAIT4: {},
+				unix.SYS_EXIT:  {},
 
 				// For the stub prctl dance (all).
-				syscall.SYS_PRCTL: []seccomp.Rule{
-					{seccomp.EqualTo(syscall.PR_SET_PDEATHSIG), seccomp.EqualTo(syscall.SIGKILL)},
+				unix.SYS_PRCTL: []seccomp.Rule{
+					{seccomp.EqualTo(unix.PR_SET_PDEATHSIG), seccomp.EqualTo(unix.SIGKILL)},
 				},
-				syscall.SYS_GETPPID: {},
+				unix.SYS_GETPPID: {},
 
 				// For the stub to stop itself (all).
-				syscall.SYS_GETPID: {},
-				syscall.SYS_KILL: []seccomp.Rule{
-					{seccomp.MatchAny{}, seccomp.EqualTo(syscall.SIGSTOP)},
+				unix.SYS_GETPID: {},
+				unix.SYS_KILL: []seccomp.Rule{
+					{seccomp.MatchAny{}, seccomp.EqualTo(unix.SIGSTOP)},
 				},
 
 				// Injected to support the address space operations.
-				syscall.SYS_MMAP:   {},
-				syscall.SYS_MUNMAP: {},
+				unix.SYS_MMAP:   {},
+				unix.SYS_MUNMAP: {},
 			},
 			Action: linux.SECCOMP_RET_ALLOW,
 		})
@@ -125,17 +125,17 @@ func attachedThread(flags uintptr, defaultAction linux.BPFAction) (*thread, erro
 	var (
 		pid   uintptr
 		ppid  uintptr
-		errno syscall.Errno
+		errno unix.Errno
 	)
 
 	// Remember the current ppid for the pdeathsig race.
-	ppid, _, _ = syscall.RawSyscall(syscall.SYS_GETPID, 0, 0, 0)
+	ppid, _, _ = unix.RawSyscall(unix.SYS_GETPID, 0, 0, 0)
 
 	// Among other things, beforeFork masks all signals.
 	beforeFork()
 
 	// Do the clone.
-	pid, _, errno = syscall.RawSyscall6(syscall.SYS_CLONE, flags, 0, 0, 0, 0, 0)
+	pid, _, errno = unix.RawSyscall6(unix.SYS_CLONE, flags, 0, 0, 0, 0, 0)
 	if errno != 0 {
 		afterFork()
 		return nil, errno
@@ -152,7 +152,7 @@ func attachedThread(flags uintptr, defaultAction linux.BPFAction) (*thread, erro
 			tid:  int32(pid),
 			cpu:  ^uint32(0),
 		}
-		if sig := t.wait(stopped); sig != syscall.SIGSTOP {
+		if sig := t.wait(stopped); sig != unix.SIGSTOP {
 			return nil, fmt.Errorf("wait failed: expected SIGSTOP, got %v", sig)
 		}
 		t.attach()
@@ -165,8 +165,8 @@ func attachedThread(flags uintptr, defaultAction linux.BPFAction) (*thread, erro
 	// prevents the stub from getting PTY job control signals intended only
 	// for the sentry process. We must call this before restoring signal
 	// mask.
-	if _, _, errno := syscall.RawSyscall(syscall.SYS_SETSID, 0, 0, 0); errno != 0 {
-		syscall.RawSyscall(syscall.SYS_EXIT, uintptr(errno), 0, 0)
+	if _, _, errno := unix.RawSyscall(unix.SYS_SETSID, 0, 0, 0); errno != 0 {
+		unix.RawSyscall(unix.SYS_EXIT, uintptr(errno), 0, 0)
 	}
 
 	// afterForkInChild resets all signals to their default dispositions
@@ -176,13 +176,13 @@ func attachedThread(flags uintptr, defaultAction linux.BPFAction) (*thread, erro
 	// Explicitly unmask all signals to ensure that the tracer can see
 	// them.
 	if errno := unmaskAllSignals(); errno != 0 {
-		syscall.RawSyscall(syscall.SYS_EXIT, uintptr(errno), 0, 0)
+		unix.RawSyscall(unix.SYS_EXIT, uintptr(errno), 0, 0)
 	}
 
 	// Set an aggressive BPF filter for the stub and all it's children. See
 	// the description of the BPF program built above.
 	if errno := seccomp.SetFilter(instrs); errno != 0 {
-		syscall.RawSyscall(syscall.SYS_EXIT, uintptr(errno), 0, 0)
+		unix.RawSyscall(unix.SYS_EXIT, uintptr(errno), 0, 0)
 	}
 
 	// Enable cpuid-faulting.
@@ -218,8 +218,8 @@ func (s *subprocess) createStub() (*thread, error) {
 	// See above re: SIGKILL.
 	pid, err := t.syscallIgnoreInterrupt(
 		&regs,
-		syscall.SYS_CLONE,
-		arch.SyscallArgument{Value: uintptr(syscall.SIGKILL | syscall.CLONE_FILES)},
+		unix.SYS_CLONE,
+		arch.SyscallArgument{Value: uintptr(unix.SIGKILL | unix.CLONE_FILES)},
 		arch.SyscallArgument{Value: 0},
 		arch.SyscallArgument{Value: 0},
 		arch.SyscallArgument{Value: 0},
@@ -237,10 +237,10 @@ func (s *subprocess) createStub() (*thread, error) {
 	// If the child actually exited, the attach below will fail.
 	_, err = t.syscallIgnoreInterrupt(
 		&t.initRegs,
-		syscall.SYS_WAIT4,
+		unix.SYS_WAIT4,
 		arch.SyscallArgument{Value: uintptr(pid)},
 		arch.SyscallArgument{Value: 0},
-		arch.SyscallArgument{Value: syscall.WALL | syscall.WUNTRACED},
+		arch.SyscallArgument{Value: unix.WALL | unix.WUNTRACED},
 		arch.SyscallArgument{Value: 0},
 		arch.SyscallArgument{Value: 0},
 		arch.SyscallArgument{Value: 0})
diff --git a/pkg/sentry/platform/ptrace/subprocess_linux_unsafe.go b/pkg/sentry/platform/ptrace/subprocess_linux_unsafe.go
index 533e45497..9c342c59b 100644
--- a/pkg/sentry/platform/ptrace/subprocess_linux_unsafe.go
+++ b/pkg/sentry/platform/ptrace/subprocess_linux_unsafe.go
@@ -18,17 +18,17 @@
 package ptrace
 
 import (
-	"syscall"
 	"unsafe"
 
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux"
 )
 
 // unmaskAllSignals unmasks all signals on the current thread.
 //
 //go:nosplit
-func unmaskAllSignals() syscall.Errno {
+func unmaskAllSignals() unix.Errno {
 	var set linux.SignalSet
-	_, _, errno := syscall.RawSyscall6(syscall.SYS_RT_SIGPROCMASK, linux.SIG_SETMASK, uintptr(unsafe.Pointer(&set)), 0, linux.SignalSetSize, 0, 0)
+	_, _, errno := unix.RawSyscall6(unix.SYS_RT_SIGPROCMASK, linux.SIG_SETMASK, uintptr(unsafe.Pointer(&set)), 0, linux.SignalSetSize, 0, 0)
 	return errno
 }