gvisor: change syscall.RawSyscall to syscall.RawSyscall6 where required

Before https://golang.org/cl/173160 syscall.RawSyscall would zero out
the last three register arguments to the system call. That no longer happens.
For system calls that take more than three arguments, use RawSyscall6 to
ensure that we pass zero, not random data, for the additional arguments.

PiperOrigin-RevId: 271062527

2 files changed, 9 insertions, 9 deletions

diff --git a/pkg/sentry/platform/ptrace/subprocess.go b/pkg/sentry/platform/ptrace/subprocess.go
index 4f8f9c5d9..9f0ecfbe4 100644
--- a/pkg/sentry/platform/ptrace/subprocess.go
+++ b/pkg/sentry/platform/ptrace/subprocess.go
@@ -267,7 +267,7 @@ func (s *subprocess) newThread() *thread {
 
 // attach attaches to the thread.
 func (t *thread) attach() {
-	if _, _, errno := syscall.RawSyscall(syscall.SYS_PTRACE, syscall.PTRACE_ATTACH, uintptr(t.tid), 0); errno != 0 {
+	if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, syscall.PTRACE_ATTACH, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 		panic(fmt.Sprintf("unable to attach: %v", errno))
 	}
 
@@ -417,7 +417,7 @@ func (t *thread) syscall(regs *syscall.PtraceRegs) (uintptr, error) {
 
 	for {
 		// Execute the syscall instruction.
-		if _, _, errno := syscall.RawSyscall(syscall.SYS_PTRACE, syscall.PTRACE_SYSCALL, uintptr(t.tid), 0); errno != 0 {
+		if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, syscall.PTRACE_SYSCALL, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 			panic(fmt.Sprintf("ptrace syscall-enter failed: %v", errno))
 		}
 
@@ -435,7 +435,7 @@ func (t *thread) syscall(regs *syscall.PtraceRegs) (uintptr, error) {
 	}
 
 	// Complete the actual system call.
-	if _, _, errno := syscall.RawSyscall(syscall.SYS_PTRACE, syscall.PTRACE_SYSCALL, uintptr(t.tid), 0); errno != 0 {
+	if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, syscall.PTRACE_SYSCALL, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 		panic(fmt.Sprintf("ptrace syscall-enter failed: %v", errno))
 	}
 
@@ -526,17 +526,17 @@ func (s *subprocess) switchToApp(c *context, ac arch.Context) bool {
 	for {
 		// Start running until the next system call.
 		if isSingleStepping(regs) {
-			if _, _, errno := syscall.RawSyscall(
+			if _, _, errno := syscall.RawSyscall6(
 				syscall.SYS_PTRACE,
 				syscall.PTRACE_SYSEMU_SINGLESTEP,
-				uintptr(t.tid), 0); errno != 0 {
+				uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 				panic(fmt.Sprintf("ptrace sysemu failed: %v", errno))
 			}
 		} else {
-			if _, _, errno := syscall.RawSyscall(
+			if _, _, errno := syscall.RawSyscall6(
 				syscall.SYS_PTRACE,
 				syscall.PTRACE_SYSEMU,
-				uintptr(t.tid), 0); errno != 0 {
+				uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 				panic(fmt.Sprintf("ptrace sysemu failed: %v", errno))
 			}
 		}
diff --git a/pkg/sentry/platform/ptrace/subprocess_linux.go b/pkg/sentry/platform/ptrace/subprocess_linux.go
index f09b0b3d0..c075b5f91 100644
--- a/pkg/sentry/platform/ptrace/subprocess_linux.go
+++ b/pkg/sentry/platform/ptrace/subprocess_linux.go
@@ -53,7 +53,7 @@ func probeSeccomp() bool {
 
 	for {
 		// Attempt an emulation.
-		if _, _, errno := syscall.RawSyscall(syscall.SYS_PTRACE, syscall.PTRACE_SYSEMU, uintptr(t.tid), 0); errno != 0 {
+		if _, _, errno := syscall.RawSyscall6(syscall.SYS_PTRACE, syscall.PTRACE_SYSEMU, uintptr(t.tid), 0, 0, 0, 0); errno != 0 {
 			panic(fmt.Sprintf("ptrace syscall-enter failed: %v", errno))
 		}
 
@@ -266,7 +266,7 @@ func attachedThread(flags uintptr, defaultAction linux.BPFAction) (*thread, erro
 
 	// Enable cpuid-faulting; this may fail on older kernels or hardware,
 	// so we just disregard the result. Host CPUID will be enabled.
-	syscall.RawSyscall(syscall.SYS_ARCH_PRCTL, linux.ARCH_SET_CPUID, 0, 0)
+	syscall.RawSyscall6(syscall.SYS_ARCH_PRCTL, linux.ARCH_SET_CPUID, 0, 0, 0, 0, 0)
 
 	// Call the stub; should not return.
 	stubCall(stubStart, ppid)