[op] Replace syscall package usage with golang.org/x/sys/unix in pkg/.

The syscall package has been deprecated in favor of golang.org/x/sys.

Note that syscall is still used in the following places:
- pkg/sentry/socket/hostinet/stack.go: some netlink related functionalities
  are not yet available in golang.org/x/sys.
- syscall.Stat_t is still used in some places because os.FileInfo.Sys() still
  returns it and not unix.Stat_t.

Updates #214

PiperOrigin-RevId: 360701387

3 files changed, 10 insertions, 8 deletions

diff --git a/pkg/sentry/limits/BUILD b/pkg/sentry/limits/BUILD
index cf591c4c1..21b0d1595 100644
--- a/pkg/sentry/limits/BUILD
+++ b/pkg/sentry/limits/BUILD
@@ -14,6 +14,7 @@ go_library(
         "//pkg/abi/linux",
         "//pkg/context",
         "//pkg/sync",
+        "@org_golang_x_sys//unix:go_default_library",
     ],
 )
 
@@ -24,4 +25,5 @@ go_test(
         "limits_test.go",
     ],
     library = ":limits",
+    deps = ["@org_golang_x_sys//unix:go_default_library"],
 )
diff --git a/pkg/sentry/limits/limits.go b/pkg/sentry/limits/limits.go
index 31b9e9ff6..7c6c4df01 100644
--- a/pkg/sentry/limits/limits.go
+++ b/pkg/sentry/limits/limits.go
@@ -16,8 +16,7 @@
 package limits
 
 import (
-	"syscall"
-
+	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/sync"
 )
 
@@ -125,10 +124,10 @@ func (l *LimitSet) Set(t LimitType, v Limit, privileged bool) (Limit, error) {
 	if _, ok := l.data[t]; ok {
 		// Unprivileged users can only lower their hard limits.
 		if l.data[t].Max < v.Max && !privileged {
-			return Limit{}, syscall.EPERM
+			return Limit{}, unix.EPERM
 		}
 		if v.Cur > v.Max {
-			return Limit{}, syscall.EINVAL
+			return Limit{}, unix.EINVAL
 		}
 	}
 	old := l.data[t]
diff --git a/pkg/sentry/limits/limits_test.go b/pkg/sentry/limits/limits_test.go
index 658a20f56..0ee877be4 100644
--- a/pkg/sentry/limits/limits_test.go
+++ b/pkg/sentry/limits/limits_test.go
@@ -15,8 +15,9 @@
 package limits
 
 import (
-	"syscall"
 	"testing"
+
+	"golang.org/x/sys/unix"
 )
 
 func TestSet(t *testing.T) {
@@ -27,9 +28,9 @@ func TestSet(t *testing.T) {
 	}{
 		{limit: Limit{Cur: 50, Max: 50}, privileged: false, expectedErr: nil},
 		{limit: Limit{Cur: 20, Max: 50}, privileged: false, expectedErr: nil},
-		{limit: Limit{Cur: 20, Max: 60}, privileged: false, expectedErr: syscall.EPERM},
-		{limit: Limit{Cur: 60, Max: 50}, privileged: false, expectedErr: syscall.EINVAL},
-		{limit: Limit{Cur: 11, Max: 10}, privileged: false, expectedErr: syscall.EINVAL},
+		{limit: Limit{Cur: 20, Max: 60}, privileged: false, expectedErr: unix.EPERM},
+		{limit: Limit{Cur: 60, Max: 50}, privileged: false, expectedErr: unix.EINVAL},
+		{limit: Limit{Cur: 11, Max: 10}, privileged: false, expectedErr: unix.EINVAL},
 		{limit: Limit{Cur: 20, Max: 60}, privileged: true, expectedErr: nil},
 	}