panic when handling libbpf_tristate value

[xixiliguo]

Describe the bug

When load bpf object file which include libbpf_tristate logic, application will panic.

ebpf/internal/kconfig/kconfig.go

Line 160 in 3ae5b17

internal.NativeEndian.PutUint64(data, uint64(tri))

enum libbpf_tristate should be 32bit in c, so we should change to internal.NativeEndian.PutUint32(data, uint32(tri))

panic: runtime error: index out of range [7] with length 4

goroutine 1 [running]:
encoding/binary.littleEndian.PutUint64({}, {0xc000012938?, 0x562a80?, 0xc000169a29?}, 0x700000000000013?)
        /usr/local/go/src/encoding/binary/binary.go:115 +0x29
github.com/cilium/ebpf/internal/kconfig.putValueTri({0xc000012938?, 0xc000166000?, 0x0?}, {0x5c6728?, 0xc000166000?}, {0x6a3ee8?, 0xc000136240?})
        /root/project/ebpf/internal/kconfig/kconfig.go:160 +0xf5
github.com/cilium/ebpf/internal/kconfig.PutValue({0xc000012938, 0x4, 0x4}, {0x5c6728?, 0xc000166000?}, {0x6a3ee8, 0x1})
        /root/project/ebpf/internal/kconfig/kconfig.go:105 +0x85
github.com/cilium/ebpf.resolveKconfig(0xc00012d980)
        /root/project/ebpf/collection.go:649 +0xa25
github.com/cilium/ebpf.resolveKconfigReferences({0xc0001002d0, 0x3, 0x3})
        /root/project/ebpf/linker.go:427 +0x125
github.com/cilium/ebpf.newProgramWithOptions(0xc0001636d0, {0x10b2c0?, 0xc0?, 0x0?, 0x0?})
        /root/project/ebpf/prog.go:334 +0x9c5
github.com/cilium/ebpf.(*collectionLoader).loadProgram(0xc00007a160, {0x54a8bb, 0xf})
        /root/project/ebpf/collection.go:504 +0x3fc
github.com/cilium/ebpf.(*CollectionSpec).LoadAndAssign.func1({0x5c7ee0, 0x579a80}, {0x54a8bb, 0xf})
        /root/project/ebpf/collection.go:268 +0x1fa
github.com/cilium/ebpf.assignValues({0x557e20, 0xc000014460}, 0xc000163c68)
        /root/project/ebpf/collection.go:884 +0x3f3
github.com/cilium/ebpf.(*CollectionSpec).LoadAndAssign(0xc00010b440, {0x557e20, 0xc000014460}, 0x40bf01?)
        /root/project/ebpf/collection.go:280 +0x196
main.loadBpfObjects({0x557e20, 0xc000014460}, 0x0)
        /root/project/ebpf/examples/test/bpf_bpfel.go:41 +0x4a
main.main()
        /root/project/ebpf/examples/test/main.go:21 +0x45
exit status 2

How to reproduce

ebpf code

#include "bpf_endian.h"
#include "common.h"

char __license[] SEC("license") = "Dual MIT/GPL";


extern  enum libbpf_tristate CONFIG_VIRTIO_NET __kconfig;


SEC("kprobe")
int kprob_prog_func(struct xdp_md *ctx) {
	return CONFIG_VIRTIO_NET;
}

Version information

v0.16.0