diff options
Diffstat (limited to 'pkg/sentry/platform/kvm')
20 files changed, 4 insertions, 1180 deletions
diff --git a/pkg/sentry/platform/kvm/BUILD b/pkg/sentry/platform/kvm/BUILD deleted file mode 100644 index 5c52d4007..000000000 --- a/pkg/sentry/platform/kvm/BUILD +++ /dev/null @@ -1,79 +0,0 @@ -load("//tools/go_stateify:defs.bzl", "go_library") -load("@io_bazel_rules_go//go:def.bzl", "go_test") - -package(licenses = ["notice"]) - -go_library( - name = "kvm", - srcs = [ - "address_space.go", - "allocator.go", - "bluepill.go", - "bluepill_amd64.go", - "bluepill_amd64.s", - "bluepill_amd64_unsafe.go", - "bluepill_arm64.go", - "bluepill_arm64.s", - "bluepill_arm64_unsafe.go", - "bluepill_fault.go", - "bluepill_unsafe.go", - "context.go", - "filters_amd64.go", - "filters_arm64.go", - "kvm.go", - "kvm_amd64.go", - "kvm_amd64_unsafe.go", - "kvm_arm64.go", - "kvm_arm64_unsafe.go", - "kvm_const.go", - "kvm_const_arm64.go", - "machine.go", - "machine_amd64.go", - "machine_amd64_unsafe.go", - "machine_arm64.go", - "machine_arm64_unsafe.go", - "machine_unsafe.go", - "physical_map.go", - "virtual_map.go", - ], - importpath = "gvisor.dev/gvisor/pkg/sentry/platform/kvm", - visibility = ["//pkg/sentry:internal"], - deps = [ - "//pkg/abi/linux", - "//pkg/atomicbitops", - "//pkg/cpuid", - "//pkg/log", - "//pkg/procid", - "//pkg/seccomp", - "//pkg/sentry/arch", - "//pkg/sentry/platform", - "//pkg/sentry/platform/interrupt", - "//pkg/sentry/platform/ring0", - "//pkg/sentry/platform/ring0/pagetables", - "//pkg/sentry/platform/safecopy", - "//pkg/sentry/time", - "//pkg/sentry/usermem", - ], -) - -go_test( - name = "kvm_test", - srcs = [ - "kvm_test.go", - "virtual_map_test.go", - ], - embed = [":kvm"], - tags = [ - "manual", - "nogotsan", - "requires-kvm", - ], - deps = [ - "//pkg/sentry/arch", - "//pkg/sentry/platform", - "//pkg/sentry/platform/kvm/testutil", - "//pkg/sentry/platform/ring0", - "//pkg/sentry/platform/ring0/pagetables", - "//pkg/sentry/usermem", - ], -) diff --git a/pkg/sentry/platform/kvm/bluepill_arm64.go b/pkg/sentry/platform/kvm/bluepill_arm64.go index 552341721..552341721 100644..100755 --- a/pkg/sentry/platform/kvm/bluepill_arm64.go +++ b/pkg/sentry/platform/kvm/bluepill_arm64.go diff --git a/pkg/sentry/platform/kvm/bluepill_arm64.s b/pkg/sentry/platform/kvm/bluepill_arm64.s index c61700892..c61700892 100644..100755 --- a/pkg/sentry/platform/kvm/bluepill_arm64.s +++ b/pkg/sentry/platform/kvm/bluepill_arm64.s diff --git a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go index e5fac0d6a..e5fac0d6a 100644..100755 --- a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go +++ b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go diff --git a/pkg/sentry/platform/kvm/filters_amd64.go b/pkg/sentry/platform/kvm/filters_amd64.go index 7d949f1dd..7d949f1dd 100644..100755 --- a/pkg/sentry/platform/kvm/filters_amd64.go +++ b/pkg/sentry/platform/kvm/filters_amd64.go diff --git a/pkg/sentry/platform/kvm/filters_arm64.go b/pkg/sentry/platform/kvm/filters_arm64.go index 9245d07c2..9245d07c2 100644..100755 --- a/pkg/sentry/platform/kvm/filters_arm64.go +++ b/pkg/sentry/platform/kvm/filters_arm64.go diff --git a/pkg/sentry/platform/kvm/kvm_arm64.go b/pkg/sentry/platform/kvm/kvm_arm64.go index 2319c86d3..2319c86d3 100644..100755 --- a/pkg/sentry/platform/kvm/kvm_arm64.go +++ b/pkg/sentry/platform/kvm/kvm_arm64.go diff --git a/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go b/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go index 6531bae1d..6531bae1d 100644..100755 --- a/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go +++ b/pkg/sentry/platform/kvm/kvm_arm64_unsafe.go diff --git a/pkg/sentry/platform/kvm/kvm_const_arm64.go b/pkg/sentry/platform/kvm/kvm_const_arm64.go index 5a74c6e36..5a74c6e36 100644..100755 --- a/pkg/sentry/platform/kvm/kvm_const_arm64.go +++ b/pkg/sentry/platform/kvm/kvm_const_arm64.go diff --git a/pkg/sentry/platform/kvm/kvm_state_autogen.go b/pkg/sentry/platform/kvm/kvm_state_autogen.go new file mode 100755 index 000000000..5ab0e0735 --- /dev/null +++ b/pkg/sentry/platform/kvm/kvm_state_autogen.go @@ -0,0 +1,4 @@ +// automatically generated by stateify. + +package kvm + diff --git a/pkg/sentry/platform/kvm/kvm_test.go b/pkg/sentry/platform/kvm/kvm_test.go deleted file mode 100644 index 30df725d4..000000000 --- a/pkg/sentry/platform/kvm/kvm_test.go +++ /dev/null @@ -1,533 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package kvm - -import ( - "math/rand" - "reflect" - "sync/atomic" - "syscall" - "testing" - "time" - - "gvisor.dev/gvisor/pkg/sentry/arch" - "gvisor.dev/gvisor/pkg/sentry/platform" - "gvisor.dev/gvisor/pkg/sentry/platform/kvm/testutil" - "gvisor.dev/gvisor/pkg/sentry/platform/ring0" - "gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables" - "gvisor.dev/gvisor/pkg/sentry/usermem" -) - -var dummyFPState = (*byte)(arch.NewFloatingPointData()) - -type testHarness interface { - Errorf(format string, args ...interface{}) - Fatalf(format string, args ...interface{}) -} - -func kvmTest(t testHarness, setup func(*KVM), fn func(*vCPU) bool) { - // Create the machine. - deviceFile, err := OpenDevice() - if err != nil { - t.Fatalf("error opening device file: %v", err) - } - k, err := New(deviceFile) - if err != nil { - t.Fatalf("error creating KVM instance: %v", err) - } - defer k.machine.Destroy() - - // Call additional setup. - if setup != nil { - setup(k) - } - - var c *vCPU // For recovery. - defer func() { - redpill() - if c != nil { - k.machine.Put(c) - } - }() - for { - c = k.machine.Get() - if !fn(c) { - break - } - - // We put the vCPU here and clear the value so that the - // deferred recovery will not re-put it above. - k.machine.Put(c) - c = nil - } -} - -func bluepillTest(t testHarness, fn func(*vCPU)) { - kvmTest(t, nil, func(c *vCPU) bool { - bluepill(c) - fn(c) - return false - }) -} - -func TestKernelSyscall(t *testing.T) { - bluepillTest(t, func(c *vCPU) { - redpill() // Leave guest mode. - if got := atomic.LoadUint32(&c.state); got != vCPUUser { - t.Errorf("vCPU not in ready state: got %v", got) - } - }) -} - -func hostFault() { - defer func() { - recover() - }() - var foo *int - *foo = 0 -} - -func TestKernelFault(t *testing.T) { - hostFault() // Ensure recovery works. - bluepillTest(t, func(c *vCPU) { - hostFault() - if got := atomic.LoadUint32(&c.state); got != vCPUUser { - t.Errorf("vCPU not in ready state: got %v", got) - } - }) -} - -func TestKernelFloatingPoint(t *testing.T) { - bluepillTest(t, func(c *vCPU) { - if !testutil.FloatingPointWorks() { - t.Errorf("floating point does not work, and it should!") - } - }) -} - -func applicationTest(t testHarness, useHostMappings bool, target func(), fn func(*vCPU, *syscall.PtraceRegs, *pagetables.PageTables) bool) { - // Initialize registers & page tables. - var ( - regs syscall.PtraceRegs - pt *pagetables.PageTables - ) - testutil.SetTestTarget(®s, target) - - kvmTest(t, func(k *KVM) { - // Create new page tables. - as, _, err := k.NewAddressSpace(nil /* invalidator */) - if err != nil { - t.Fatalf("can't create new address space: %v", err) - } - pt = as.(*addressSpace).pageTables - - if useHostMappings { - // Apply the physical mappings to these page tables. - // (This is normally dangerous, since they point to - // physical pages that may not exist. This shouldn't be - // done for regular user code, but is fine for test - // purposes.) - applyPhysicalRegions(func(pr physicalRegion) bool { - pt.Map(usermem.Addr(pr.virtual), pr.length, pagetables.MapOpts{ - AccessType: usermem.AnyAccess, - User: true, - }, pr.physical) - return true // Keep iterating. - }) - } - }, func(c *vCPU) bool { - // Invoke the function with the extra data. - return fn(c, ®s, pt) - }) -} - -func TestApplicationSyscall(t *testing.T) { - applicationTest(t, true, testutil.SyscallLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - FullRestore: true, - }, &si); err == platform.ErrContextInterrupt { - return true // Retry. - } else if err != nil { - t.Errorf("application syscall with full restore failed: %v", err) - } - return false - }) - applicationTest(t, true, testutil.SyscallLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err == platform.ErrContextInterrupt { - return true // Retry. - } else if err != nil { - t.Errorf("application syscall with partial restore failed: %v", err) - } - return false - }) -} - -func TestApplicationFault(t *testing.T) { - applicationTest(t, true, testutil.Touch, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - testutil.SetTouchTarget(regs, nil) // Cause fault. - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - FullRestore: true, - }, &si); err == platform.ErrContextInterrupt { - return true // Retry. - } else if err != platform.ErrContextSignal || si.Signo != int32(syscall.SIGSEGV) { - t.Errorf("application fault with full restore got (%v, %v), expected (%v, SIGSEGV)", err, si, platform.ErrContextSignal) - } - return false - }) - applicationTest(t, true, testutil.Touch, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - testutil.SetTouchTarget(regs, nil) // Cause fault. - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err == platform.ErrContextInterrupt { - return true // Retry. - } else if err != platform.ErrContextSignal || si.Signo != int32(syscall.SIGSEGV) { - t.Errorf("application fault with partial restore got (%v, %v), expected (%v, SIGSEGV)", err, si, platform.ErrContextSignal) - } - return false - }) -} - -func TestRegistersSyscall(t *testing.T) { - applicationTest(t, true, testutil.TwiddleRegsSyscall, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - testutil.SetTestRegs(regs) // Fill values for all registers. - for { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err == platform.ErrContextInterrupt { - continue // Retry. - } else if err != nil { - t.Errorf("application register check with partial restore got unexpected error: %v", err) - } - if err := testutil.CheckTestRegs(regs, false); err != nil { - t.Errorf("application register check with partial restore failed: %v", err) - } - break // Done. - } - return false - }) -} - -func TestRegistersFault(t *testing.T) { - applicationTest(t, true, testutil.TwiddleRegsFault, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - testutil.SetTestRegs(regs) // Fill values for all registers. - for { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - FullRestore: true, - }, &si); err == platform.ErrContextInterrupt { - continue // Retry. - } else if err != platform.ErrContextSignal || si.Signo != int32(syscall.SIGSEGV) { - t.Errorf("application register check with full restore got unexpected error: %v", err) - } - if err := testutil.CheckTestRegs(regs, true); err != nil { - t.Errorf("application register check with full restore failed: %v", err) - } - break // Done. - } - return false - }) -} - -func TestSegments(t *testing.T) { - applicationTest(t, true, testutil.TwiddleSegments, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - testutil.SetTestSegments(regs) - for { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - FullRestore: true, - }, &si); err == platform.ErrContextInterrupt { - continue // Retry. - } else if err != nil { - t.Errorf("application segment check with full restore got unexpected error: %v", err) - } - if err := testutil.CheckTestSegments(regs); err != nil { - t.Errorf("application segment check with full restore failed: %v", err) - } - break // Done. - } - return false - }) -} - -func TestBounce(t *testing.T) { - applicationTest(t, true, testutil.SpinLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - go func() { - time.Sleep(time.Millisecond) - c.BounceToKernel() - }() - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err != platform.ErrContextInterrupt { - t.Errorf("application partial restore: got %v, wanted %v", err, platform.ErrContextInterrupt) - } - return false - }) - applicationTest(t, true, testutil.SpinLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - go func() { - time.Sleep(time.Millisecond) - c.BounceToKernel() - }() - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - FullRestore: true, - }, &si); err != platform.ErrContextInterrupt { - t.Errorf("application full restore: got %v, wanted %v", err, platform.ErrContextInterrupt) - } - return false - }) -} - -func TestBounceStress(t *testing.T) { - applicationTest(t, true, testutil.SpinLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - randomSleep := func() { - // O(hundreds of microseconds) is appropriate to ensure - // different overlaps and different schedules. - if n := rand.Intn(1000); n > 100 { - time.Sleep(time.Duration(n) * time.Microsecond) - } - } - for i := 0; i < 1000; i++ { - // Start an asynchronously executing goroutine that - // calls Bounce at pseudo-random point in time. - // This should wind up calling Bounce when the - // kernel is in various stages of the switch. - go func() { - randomSleep() - c.BounceToKernel() - }() - randomSleep() - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err != platform.ErrContextInterrupt { - t.Errorf("application partial restore: got %v, wanted %v", err, platform.ErrContextInterrupt) - } - c.unlock() - randomSleep() - c.lock() - } - return false - }) -} - -func TestInvalidate(t *testing.T) { - var data uintptr // Used below. - applicationTest(t, true, testutil.Touch, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - testutil.SetTouchTarget(regs, &data) // Read legitimate value. - for { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err == platform.ErrContextInterrupt { - continue // Retry. - } else if err != nil { - t.Errorf("application partial restore: got %v, wanted nil", err) - } - break // Done. - } - // Unmap the page containing data & invalidate. - pt.Unmap(usermem.Addr(reflect.ValueOf(&data).Pointer() & ^uintptr(usermem.PageSize-1)), usermem.PageSize) - for { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - Flush: true, - }, &si); err == platform.ErrContextInterrupt { - continue // Retry. - } else if err != platform.ErrContextSignal { - t.Errorf("application partial restore: got %v, wanted %v", err, platform.ErrContextSignal) - } - break // Success. - } - return false - }) -} - -// IsFault returns true iff the given signal represents a fault. -func IsFault(err error, si *arch.SignalInfo) bool { - return err == platform.ErrContextSignal && si.Signo == int32(syscall.SIGSEGV) -} - -func TestEmptyAddressSpace(t *testing.T) { - applicationTest(t, false, testutil.SyscallLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err == platform.ErrContextInterrupt { - return true // Retry. - } else if !IsFault(err, &si) { - t.Errorf("first fault with partial restore failed got %v", err) - t.Logf("registers: %#v", ®s) - } - return false - }) - applicationTest(t, false, testutil.SyscallLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - FullRestore: true, - }, &si); err == platform.ErrContextInterrupt { - return true // Retry. - } else if !IsFault(err, &si) { - t.Errorf("first fault with full restore failed got %v", err) - t.Logf("registers: %#v", ®s) - } - return false - }) -} - -func TestWrongVCPU(t *testing.T) { - kvmTest(t, nil, func(c1 *vCPU) bool { - kvmTest(t, nil, func(c2 *vCPU) bool { - // Basic test, one then the other. - bluepill(c1) - bluepill(c2) - if c2.switches == 0 { - // Don't allow the test to proceed if this fails. - t.Fatalf("wrong vCPU#2 switches: vCPU1=%+v,vCPU2=%+v", c1, c2) - } - - // Alternate vCPUs; we expect to need to trigger the - // wrong vCPU path on each switch. - for i := 0; i < 100; i++ { - bluepill(c1) - bluepill(c2) - } - if count := c1.switches; count < 90 { - t.Errorf("wrong vCPU#1 switches: vCPU1=%+v,vCPU2=%+v", c1, c2) - } - if count := c2.switches; count < 90 { - t.Errorf("wrong vCPU#2 switches: vCPU1=%+v,vCPU2=%+v", c1, c2) - } - return false - }) - return false - }) - kvmTest(t, nil, func(c1 *vCPU) bool { - kvmTest(t, nil, func(c2 *vCPU) bool { - bluepill(c1) - bluepill(c2) - return false - }) - return false - }) -} - -func BenchmarkApplicationSyscall(b *testing.B) { - var ( - i int // Iteration includes machine.Get() / machine.Put(). - a int // Count for ErrContextInterrupt. - ) - applicationTest(b, true, testutil.SyscallLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err == platform.ErrContextInterrupt { - a++ - return true // Ignore. - } else if err != nil { - b.Fatalf("benchmark failed: %v", err) - } - i++ - return i < b.N - }) - if a != 0 { - b.Logf("ErrContextInterrupt occurred %d times (in %d iterations).", a, a+i) - } -} - -func BenchmarkKernelSyscall(b *testing.B) { - // Note that the target passed here is irrelevant, we never execute SwitchToUser. - applicationTest(b, true, testutil.Getpid, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - // iteration does not include machine.Get() / machine.Put(). - for i := 0; i < b.N; i++ { - testutil.Getpid() - } - return false - }) -} - -func BenchmarkWorldSwitchToUserRoundtrip(b *testing.B) { - // see BenchmarkApplicationSyscall. - var ( - i int - a int - ) - applicationTest(b, true, testutil.SyscallLoop, func(c *vCPU, regs *syscall.PtraceRegs, pt *pagetables.PageTables) bool { - var si arch.SignalInfo - if _, err := c.SwitchToUser(ring0.SwitchOpts{ - Registers: regs, - FloatingPointState: dummyFPState, - PageTables: pt, - }, &si); err == platform.ErrContextInterrupt { - a++ - return true // Ignore. - } else if err != nil { - b.Fatalf("benchmark failed: %v", err) - } - // This will intentionally cause the world switch. By executing - // a host syscall here, we force the transition between guest - // and host mode. - testutil.Getpid() - i++ - return i < b.N - }) - if a != 0 { - b.Logf("ErrContextInterrupt occurred %d times (in %d iterations).", a, a+i) - } -} diff --git a/pkg/sentry/platform/kvm/machine_arm64.go b/pkg/sentry/platform/kvm/machine_arm64.go index 7ae47f291..7ae47f291 100644..100755 --- a/pkg/sentry/platform/kvm/machine_arm64.go +++ b/pkg/sentry/platform/kvm/machine_arm64.go diff --git a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go index 3f2f97a6b..3f2f97a6b 100644..100755 --- a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go +++ b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go diff --git a/pkg/sentry/platform/kvm/testutil/BUILD b/pkg/sentry/platform/kvm/testutil/BUILD deleted file mode 100644 index b0e45f159..000000000 --- a/pkg/sentry/platform/kvm/testutil/BUILD +++ /dev/null @@ -1,17 +0,0 @@ -load("//tools/go_stateify:defs.bzl", "go_library") - -package(licenses = ["notice"]) - -go_library( - name = "testutil", - testonly = 1, - srcs = [ - "testutil.go", - "testutil_amd64.go", - "testutil_amd64.s", - "testutil_arm64.go", - "testutil_arm64.s", - ], - importpath = "gvisor.dev/gvisor/pkg/sentry/platform/kvm/testutil", - visibility = ["//pkg/sentry/platform/kvm:__pkg__"], -) diff --git a/pkg/sentry/platform/kvm/testutil/testutil.go b/pkg/sentry/platform/kvm/testutil/testutil.go deleted file mode 100644 index 5c1efa0fd..000000000 --- a/pkg/sentry/platform/kvm/testutil/testutil.go +++ /dev/null @@ -1,72 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Package testutil provides common assembly stubs for testing. -package testutil - -import ( - "fmt" - "strings" -) - -// Getpid executes a trivial system call. -func Getpid() - -// Touch touches the value in the first register. -func Touch() - -// SyscallLoop executes a syscall and loops. -func SyscallLoop() - -// SpinLoop spins on the CPU. -func SpinLoop() - -// HaltLoop immediately halts and loops. -func HaltLoop() - -// TwiddleRegsFault twiddles registers then faults. -func TwiddleRegsFault() - -// TwiddleRegsSyscall twiddles registers then executes a syscall. -func TwiddleRegsSyscall() - -// FloatingPointWorks is a floating point test. -// -// It returns true or false. -func FloatingPointWorks() bool - -// RegisterMismatchError is used for checking registers. -type RegisterMismatchError []string - -// Error returns a human-readable error. -func (r RegisterMismatchError) Error() string { - return strings.Join([]string(r), ";") -} - -// addRegisterMisatch allows simple chaining of register mismatches. -func addRegisterMismatch(err error, reg string, got, expected interface{}) error { - errStr := fmt.Sprintf("%s got %08x, expected %08x", reg, got, expected) - switch r := err.(type) { - case nil: - // Return a new register mismatch. - return RegisterMismatchError{errStr} - case RegisterMismatchError: - // Append the error. - r = append(r, errStr) - return r - default: - // Leave as is. - return err - } -} diff --git a/pkg/sentry/platform/kvm/testutil/testutil_amd64.go b/pkg/sentry/platform/kvm/testutil/testutil_amd64.go deleted file mode 100644 index 4c108abbf..000000000 --- a/pkg/sentry/platform/kvm/testutil/testutil_amd64.go +++ /dev/null @@ -1,138 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// +build amd64 - -package testutil - -import ( - "reflect" - "syscall" -) - -// TwiddleSegments reads segments into known registers. -func TwiddleSegments() - -// SetTestTarget sets the rip appropriately. -func SetTestTarget(regs *syscall.PtraceRegs, fn func()) { - regs.Rip = uint64(reflect.ValueOf(fn).Pointer()) -} - -// SetTouchTarget sets rax appropriately. -func SetTouchTarget(regs *syscall.PtraceRegs, target *uintptr) { - if target != nil { - regs.Rax = uint64(reflect.ValueOf(target).Pointer()) - } else { - regs.Rax = 0 - } -} - -// RewindSyscall rewinds a syscall RIP. -func RewindSyscall(regs *syscall.PtraceRegs) { - regs.Rip -= 2 -} - -// SetTestRegs initializes registers to known values. -func SetTestRegs(regs *syscall.PtraceRegs) { - regs.R15 = 0x15 - regs.R14 = 0x14 - regs.R13 = 0x13 - regs.R12 = 0x12 - regs.Rbp = 0xb9 - regs.Rbx = 0xb4 - regs.R11 = 0x11 - regs.R10 = 0x10 - regs.R9 = 0x09 - regs.R8 = 0x08 - regs.Rax = 0x44 - regs.Rcx = 0xc4 - regs.Rdx = 0xd4 - regs.Rsi = 0x51 - regs.Rdi = 0xd1 - regs.Rsp = 0x59 -} - -// CheckTestRegs checks that registers were twiddled per TwiddleRegs. -func CheckTestRegs(regs *syscall.PtraceRegs, full bool) (err error) { - if need := ^uint64(0x15); regs.R15 != need { - err = addRegisterMismatch(err, "R15", regs.R15, need) - } - if need := ^uint64(0x14); regs.R14 != need { - err = addRegisterMismatch(err, "R14", regs.R14, need) - } - if need := ^uint64(0x13); regs.R13 != need { - err = addRegisterMismatch(err, "R13", regs.R13, need) - } - if need := ^uint64(0x12); regs.R12 != need { - err = addRegisterMismatch(err, "R12", regs.R12, need) - } - if need := ^uint64(0xb9); regs.Rbp != need { - err = addRegisterMismatch(err, "Rbp", regs.Rbp, need) - } - if need := ^uint64(0xb4); regs.Rbx != need { - err = addRegisterMismatch(err, "Rbx", regs.Rbx, need) - } - if need := ^uint64(0x10); regs.R10 != need { - err = addRegisterMismatch(err, "R10", regs.R10, need) - } - if need := ^uint64(0x09); regs.R9 != need { - err = addRegisterMismatch(err, "R9", regs.R9, need) - } - if need := ^uint64(0x08); regs.R8 != need { - err = addRegisterMismatch(err, "R8", regs.R8, need) - } - if need := ^uint64(0x44); regs.Rax != need { - err = addRegisterMismatch(err, "Rax", regs.Rax, need) - } - if need := ^uint64(0xd4); regs.Rdx != need { - err = addRegisterMismatch(err, "Rdx", regs.Rdx, need) - } - if need := ^uint64(0x51); regs.Rsi != need { - err = addRegisterMismatch(err, "Rsi", regs.Rsi, need) - } - if need := ^uint64(0xd1); regs.Rdi != need { - err = addRegisterMismatch(err, "Rdi", regs.Rdi, need) - } - if need := ^uint64(0x59); regs.Rsp != need { - err = addRegisterMismatch(err, "Rsp", regs.Rsp, need) - } - // Rcx & R11 are ignored if !full is set. - if need := ^uint64(0x11); full && regs.R11 != need { - err = addRegisterMismatch(err, "R11", regs.R11, need) - } - if need := ^uint64(0xc4); full && regs.Rcx != need { - err = addRegisterMismatch(err, "Rcx", regs.Rcx, need) - } - return -} - -var fsData uint64 = 0x55 -var gsData uint64 = 0x85 - -// SetTestSegments initializes segments to known values. -func SetTestSegments(regs *syscall.PtraceRegs) { - regs.Fs_base = uint64(reflect.ValueOf(&fsData).Pointer()) - regs.Gs_base = uint64(reflect.ValueOf(&gsData).Pointer()) -} - -// CheckTestSegments checks that registers were twiddled per TwiddleSegments. -func CheckTestSegments(regs *syscall.PtraceRegs) (err error) { - if regs.Rax != fsData { - err = addRegisterMismatch(err, "Rax", regs.Rax, fsData) - } - if regs.Rbx != gsData { - err = addRegisterMismatch(err, "Rbx", regs.Rcx, gsData) - } - return -} diff --git a/pkg/sentry/platform/kvm/testutil/testutil_amd64.s b/pkg/sentry/platform/kvm/testutil/testutil_amd64.s deleted file mode 100644 index 491ec0c2a..000000000 --- a/pkg/sentry/platform/kvm/testutil/testutil_amd64.s +++ /dev/null @@ -1,98 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// +build amd64 - -// test_util_amd64.s provides AMD64 test functions. - -#include "funcdata.h" -#include "textflag.h" - -TEXT ·Getpid(SB),NOSPLIT,$0 - NO_LOCAL_POINTERS - MOVQ $39, AX // getpid - SYSCALL - RET - -TEXT ·Touch(SB),NOSPLIT,$0 -start: - MOVQ 0(AX), BX // deref AX - MOVQ $39, AX // getpid - SYSCALL - JMP start - -TEXT ·HaltLoop(SB),NOSPLIT,$0 -start: - HLT - JMP start - -TEXT ·SyscallLoop(SB),NOSPLIT,$0 -start: - SYSCALL - JMP start - -TEXT ·SpinLoop(SB),NOSPLIT,$0 -start: - JMP start - -TEXT ·FloatingPointWorks(SB),NOSPLIT,$0-8 - NO_LOCAL_POINTERS - MOVQ $1, AX - MOVQ AX, X0 - MOVQ $39, AX // getpid - SYSCALL - MOVQ X0, AX - CMPQ AX, $1 - SETEQ ret+0(FP) - RET - -#define TWIDDLE_REGS() \ - NOTQ R15; \ - NOTQ R14; \ - NOTQ R13; \ - NOTQ R12; \ - NOTQ BP; \ - NOTQ BX; \ - NOTQ R11; \ - NOTQ R10; \ - NOTQ R9; \ - NOTQ R8; \ - NOTQ AX; \ - NOTQ CX; \ - NOTQ DX; \ - NOTQ SI; \ - NOTQ DI; \ - NOTQ SP; - -TEXT ·TwiddleRegsSyscall(SB),NOSPLIT,$0 - TWIDDLE_REGS() - SYSCALL - RET // never reached - -TEXT ·TwiddleRegsFault(SB),NOSPLIT,$0 - TWIDDLE_REGS() - JMP AX // must fault - RET // never reached - -#define READ_FS() BYTE $0x64; BYTE $0x48; BYTE $0x8b; BYTE $0x00; -#define READ_GS() BYTE $0x65; BYTE $0x48; BYTE $0x8b; BYTE $0x00; - -TEXT ·TwiddleSegments(SB),NOSPLIT,$0 - MOVQ $0x0, AX - READ_GS() - MOVQ AX, BX - MOVQ $0x0, AX - READ_FS() - SYSCALL - RET // never reached diff --git a/pkg/sentry/platform/kvm/testutil/testutil_arm64.go b/pkg/sentry/platform/kvm/testutil/testutil_arm64.go deleted file mode 100644 index 40b2e4acc..000000000 --- a/pkg/sentry/platform/kvm/testutil/testutil_arm64.go +++ /dev/null @@ -1,59 +0,0 @@ -// Copyright 2019 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// +build arm64 - -package testutil - -import ( - "fmt" - "reflect" - "syscall" -) - -// SetTestTarget sets the rip appropriately. -func SetTestTarget(regs *syscall.PtraceRegs, fn func()) { - regs.Pc = uint64(reflect.ValueOf(fn).Pointer()) -} - -// SetTouchTarget sets rax appropriately. -func SetTouchTarget(regs *syscall.PtraceRegs, target *uintptr) { - if target != nil { - regs.Regs[8] = uint64(reflect.ValueOf(target).Pointer()) - } else { - regs.Regs[8] = 0 - } -} - -// RewindSyscall rewinds a syscall RIP. -func RewindSyscall(regs *syscall.PtraceRegs) { - regs.Pc -= 4 -} - -// SetTestRegs initializes registers to known values. -func SetTestRegs(regs *syscall.PtraceRegs) { - for i := 0; i <= 30; i++ { - regs.Regs[i] = uint64(i) + 1 - } -} - -// CheckTestRegs checks that registers were twiddled per TwiddleRegs. -func CheckTestRegs(regs *syscall.PtraceRegs, full bool) (err error) { - for i := 0; i <= 30; i++ { - if need := ^uint64(i + 1); regs.Regs[i] != need { - err = addRegisterMismatch(err, fmt.Sprintf("R%d", i), regs.Regs[i], need) - } - } - return -} diff --git a/pkg/sentry/platform/kvm/testutil/testutil_arm64.s b/pkg/sentry/platform/kvm/testutil/testutil_arm64.s deleted file mode 100644 index 2cd28b2d2..000000000 --- a/pkg/sentry/platform/kvm/testutil/testutil_arm64.s +++ /dev/null @@ -1,91 +0,0 @@ -// Copyright 2019 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// +build arm64 - -// test_util_arm64.s provides ARM64 test functions. - -#include "funcdata.h" -#include "textflag.h" - -#define SYS_GETPID 172 - -// This function simulates the getpid syscall. -TEXT ·Getpid(SB),NOSPLIT,$0 - NO_LOCAL_POINTERS - MOVD $SYS_GETPID, R8 - SVC - RET - -TEXT ·Touch(SB),NOSPLIT,$0 -start: - MOVD 0(R8), R1 - MOVD $SYS_GETPID, R8 // getpid - SVC - B start - -TEXT ·HaltLoop(SB),NOSPLIT,$0 -start: - HLT - B start - -// This function simulates a loop of syscall. -TEXT ·SyscallLoop(SB),NOSPLIT,$0 -start: - SVC - B start - -TEXT ·SpinLoop(SB),NOSPLIT,$0 -start: - B start - -// MVN: bitwise logical NOT -// This case simulates an application that modified R0-R30. -#define TWIDDLE_REGS() \ - MVN R0, R0; \ - MVN R1, R1; \ - MVN R2, R2; \ - MVN R3, R3; \ - MVN R4, R4; \ - MVN R5, R5; \ - MVN R6, R6; \ - MVN R7, R7; \ - MVN R8, R8; \ - MVN R9, R9; \ - MVN R10, R10; \ - MVN R11, R11; \ - MVN R12, R12; \ - MVN R13, R13; \ - MVN R14, R14; \ - MVN R15, R15; \ - MVN R16, R16; \ - MVN R17, R17; \ - MVN R18_PLATFORM, R18_PLATFORM; \ - MVN R19, R19; \ - MVN R20, R20; \ - MVN R21, R21; \ - MVN R22, R22; \ - MVN R23, R23; \ - MVN R24, R24; \ - MVN R25, R25; \ - MVN R26, R26; \ - MVN R27, R27; \ - MVN g, g; \ - MVN R29, R29; \ - MVN R30, R30; - -TEXT ·TwiddleRegsSyscall(SB),NOSPLIT,$0 - TWIDDLE_REGS() - SVC - RET // never reached diff --git a/pkg/sentry/platform/kvm/virtual_map_test.go b/pkg/sentry/platform/kvm/virtual_map_test.go deleted file mode 100644 index 6a2f145be..000000000 --- a/pkg/sentry/platform/kvm/virtual_map_test.go +++ /dev/null @@ -1,93 +0,0 @@ -// Copyright 2018 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package kvm - -import ( - "syscall" - "testing" - - "gvisor.dev/gvisor/pkg/sentry/usermem" -) - -type checker struct { - ok bool - accessType usermem.AccessType -} - -func (c *checker) Containing(addr uintptr) func(virtualRegion) { - c.ok = false // Reset for below calls. - return func(vr virtualRegion) { - if vr.virtual <= addr && addr < vr.virtual+vr.length { - c.ok = true - c.accessType = vr.accessType - } - } -} - -func TestParseMaps(t *testing.T) { - c := new(checker) - - // Simple test. - if err := applyVirtualRegions(c.Containing(0)); err != nil { - t.Fatalf("unexpected error: %v", err) - } - - // MMap a new page. - addr, _, errno := syscall.RawSyscall6( - syscall.SYS_MMAP, 0, usermem.PageSize, - syscall.PROT_READ|syscall.PROT_WRITE, - syscall.MAP_ANONYMOUS|syscall.MAP_PRIVATE, 0, 0) - if errno != 0 { - t.Fatalf("unexpected map error: %v", errno) - } - - // Re-parse maps. - if err := applyVirtualRegions(c.Containing(addr)); err != nil { - syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0) - t.Fatalf("unexpected error: %v", err) - } - - // Assert that it now does contain the region. - if !c.ok { - syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0) - t.Fatalf("updated map does not contain 0x%08x, expected true", addr) - } - - // Map the region as PROT_NONE. - newAddr, _, errno := syscall.RawSyscall6( - syscall.SYS_MMAP, addr, usermem.PageSize, - syscall.PROT_NONE, - syscall.MAP_ANONYMOUS|syscall.MAP_FIXED|syscall.MAP_PRIVATE, 0, 0) - if errno != 0 { - t.Fatalf("unexpected map error: %v", errno) - } - if newAddr != addr { - t.Fatalf("unable to remap address: got 0x%08x, wanted 0x%08x", newAddr, addr) - } - - // Re-parse maps. - if err := applyVirtualRegions(c.Containing(addr)); err != nil { - t.Fatalf("unexpected error: %v", err) - } - if !c.ok { - t.Fatalf("final map does not contain 0x%08x, expected true", addr) - } - if c.accessType.Read || c.accessType.Write || c.accessType.Execute { - t.Fatalf("final map has incorrect permissions for 0x%08x", addr) - } - - // Unmap the region. - syscall.RawSyscall(syscall.SYS_MUNMAP, addr, usermem.PageSize, 0) -} |