internal/linux: use unix.Auxv

Use the newly added Auxv wrapper added in golang.org/x/sys/unix v0.30.0
instead of manually go:linknaming runtime.getAuxv. This also allows to
get rid of the check for malformed auxv data as it is already performed
by unix.Auxv.

Signed-off-by: Tobias Klauser <[email protected]>

Author: tklauser

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/go-quicktest/qt v1.101.0
 	github.com/google/go-cmp v0.6.0
 	github.com/jsimonetti/rtnetlink/v2 v2.0.1
-	golang.org/x/sys v0.28.0
+	golang.org/x/sys v0.30.0
 )
 
 require (

go.sum

@@ -23,5 +23,5 @@ golang.org/x/net v0.33.0 h1:74SYHlV8BIgHIFC/LrYkOGIwL19eTYXQ5wc6TBuO36I=
 golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
-golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=

internal/linux/auxv.go

@@ -1,12 +1,11 @@
 package linux
 
 import (
-	"errors"
 	"fmt"
 	"io"
-	_ "unsafe"
 
 	"github.com/cilium/ebpf/internal"
+	"github.com/cilium/ebpf/unix"
 )
 
 type auxvPairReader interface {
@@ -20,9 +19,6 @@ const (
 	_AT_SYSINFO_EHDR = 33 // Offset to vDSO blob in process image
 )
 
-//go:linkname runtime_getAuxv runtime.getAuxv
-func runtime_getAuxv() []uintptr
-
 type auxvRuntimeReader struct {
 	data  []uintptr
 	index int
@@ -54,10 +50,9 @@ func newAuxvRuntimeReader() (auxvPairReader, error) {
 		return nil, fmt.Errorf("read auxv from runtime: %w", internal.ErrNotSupportedOnOS)
 	}
 
-	data := runtime_getAuxv()
-
-	if len(data)%2 != 0 {
-		return nil, errors.New("malformed auxv passed from runtime")
+	data, err := unix.Auxv()
+	if err != nil {
+		return nil, fmt.Errorf("read auxv from runtime: %w", err)
 	}
 
 	return &auxvRuntimeReader{

internal/unix/types_linux.go

@@ -195,3 +195,7 @@ func SchedSetaffinity(pid int, set *CPUSet) error {
 func SchedGetaffinity(pid int, set *CPUSet) error {
 	return linux.SchedGetaffinity(pid, set)
 }
+
+func Auxv() ([][2]uintptr, error) {
+	return linux.Auxv()
+}

internal/unix/types_other.go

@@ -278,3 +278,7 @@ func SchedSetaffinity(pid int, set *CPUSet) error {
 func SchedGetaffinity(pid int, set *CPUSet) error {
 	return errNonLinux()
 }
+
+func Auxv() ([][2]uintptr, error) {
+	return nil, errNonLinux()
+}