Bump dependency opencontainers/runc@v1.0.0-rc10

vendor/github.com/cilium/ebpf/linker.go

@@ -0,0 +1,70 @@
+package ebpf
+
+import (
+	"github.com/cilium/ebpf/asm"
+	"github.com/cilium/ebpf/internal/btf"
+	"github.com/pkg/errors"
+)
+
+// link resolves bpf-to-bpf calls.
+//
+// Each library may contain multiple functions / labels, and is only linked
+// if the program being edited references one of these functions.
+//
+// Libraries must not require linking themselves.
+func link(prog *ProgramSpec, libs []*ProgramSpec) error {
+	for _, lib := range libs {
+		insns, err := linkSection(prog.Instructions, lib.Instructions)
+		if err != nil {
+			return errors.Wrapf(err, "linking %s", lib.Name)
+		}
+
+		if len(insns) == len(prog.Instructions) {
+			continue
+		}
+
+		prog.Instructions = insns
+		if prog.BTF != nil && lib.BTF != nil {
+			if err := btf.ProgramAppend(prog.BTF, lib.BTF); err != nil {
+				return errors.Wrapf(err, "linking BTF of %s", lib.Name)
+			}
+		}
+	}
+	return nil
+}
+
+func linkSection(insns, section asm.Instructions) (asm.Instructions, error) {
+	// A map of symbols to the libraries which contain them.
+	symbols, err := section.SymbolOffsets()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, ins := range insns {
+		if ins.Reference == "" {
+			continue
+		}
+
+		if ins.OpCode.JumpOp() != asm.Call || ins.Src != asm.R1 {
+			continue
+		}
+
+		if ins.Constant != -1 {
+			// This is already a valid call, no need to link again.
+			continue
+		}
+
+		if _, ok := symbols[ins.Reference]; !ok {
+			// Symbol isn't available in this section
+			continue
+		}
+
+		// At this point we know that at least one function in the
+		// library is called from insns. Merge the two sections.
+		// The rewrite of ins.Constant happens in asm.Instruction.Marshal.
+		return append(insns, section...), nil
+	}
+
+	// None of the functions in the section are called. Do nothing.
+	return insns, nil
+}