1 files changed, 0 insertions, 373 deletions
diff --git a/vendor/github.com/cilium/ebpf/link/uprobe.go b/vendor/github.com/cilium/ebpf/link/uprobe.go
deleted file mode 100644
index edf925b57..000000000
--- a/vendor/github.com/cilium/ebpf/link/uprobe.go
+++ /dev/null
@@ -1,373 +0,0 @@
-package link
-
-import (
-	"debug/elf"
-	"errors"
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-	"sync"
-
-	"github.com/cilium/ebpf"
-	"github.com/cilium/ebpf/internal"
-)
-
-var (
-	uprobeEventsPath = filepath.Join(tracefsPath, "uprobe_events")
-
-	uprobeRetprobeBit = struct {
-		once  sync.Once
-		value uint64
-		err   error
-	}{}
-
-	uprobeRefCtrOffsetPMUPath = "/sys/bus/event_source/devices/uprobe/format/ref_ctr_offset"
-	// elixir.bootlin.com/linux/v5.15-rc7/source/kernel/events/core.c#L9799
-	uprobeRefCtrOffsetShift = 32
-	haveRefCtrOffsetPMU     = internal.FeatureTest("RefCtrOffsetPMU", "4.20", func() error {
-		_, err := os.Stat(uprobeRefCtrOffsetPMUPath)
-		if err != nil {
-			return internal.ErrNotSupported
-		}
-		return nil
-	})
-
-	// ErrNoSymbol indicates that the given symbol was not found
-	// in the ELF symbols table.
-	ErrNoSymbol = errors.New("not found")
-)
-
-// Executable defines an executable program on the filesystem.
-type Executable struct {
-	// Path of the executable on the filesystem.
-	path string
-	// Parsed ELF and dynamic symbols' addresses.
-	addresses map[string]uint64
-}
-
-// UprobeOptions defines additional parameters that will be used
-// when loading Uprobes.
-type UprobeOptions struct {
-	// Symbol address. Must be provided in case of external symbols (shared libs).
-	// If set, overrides the address eventually parsed from the executable.
-	Address uint64
-	// The offset relative to given symbol. Useful when tracing an arbitrary point
-	// inside the frame of given symbol.
-	//
-	// Note: this field changed from being an absolute offset to being relative
-	// to Address.
-	Offset uint64
-	// Only set the uprobe on the given process ID. Useful when tracing
-	// shared library calls or programs that have many running instances.
-	PID int
-	// Automatically manage SDT reference counts (semaphores).
-	//
-	// If this field is set, the Kernel will increment/decrement the
-	// semaphore located in the process memory at the provided address on
-	// probe attach/detach.
-	//
-	// See also:
-	// sourceware.org/systemtap/wiki/UserSpaceProbeImplementation (Semaphore Handling)
-	// github.com/torvalds/linux/commit/1cc33161a83d
-	// github.com/torvalds/linux/commit/a6ca88b241d5
-	RefCtrOffset uint64
-	// Arbitrary value that can be fetched from an eBPF program
-	// via `bpf_get_attach_cookie()`.
-	//
-	// Needs kernel 5.15+.
-	Cookie uint64
-}
-
-// To open a new Executable, use:
-//
-//  OpenExecutable("/bin/bash")
-//
-// The returned value can then be used to open Uprobe(s).
-func OpenExecutable(path string) (*Executable, error) {
-	if path == "" {
-		return nil, fmt.Errorf("path cannot be empty")
-	}
-
-	f, err := os.Open(path)
-	if err != nil {
-		return nil, fmt.Errorf("open file '%s': %w", path, err)
-	}
-	defer f.Close()
-
-	se, err := internal.NewSafeELFFile(f)
-	if err != nil {
-		return nil, fmt.Errorf("parse ELF file: %w", err)
-	}
-
-	if se.Type != elf.ET_EXEC && se.Type != elf.ET_DYN {
-		// ELF is not an executable or a shared object.
-		return nil, errors.New("the given file is not an executable or a shared object")
-	}
-
-	ex := Executable{
-		path:      path,
-		addresses: make(map[string]uint64),
-	}
-
-	if err := ex.load(se); err != nil {
-		return nil, err
-	}
-
-	return &ex, nil
-}
-
-func (ex *Executable) load(f *internal.SafeELFFile) error {
-	syms, err := f.Symbols()
-	if err != nil && !errors.Is(err, elf.ErrNoSymbols) {
-		return err
-	}
-
-	dynsyms, err := f.DynamicSymbols()
-	if err != nil && !errors.Is(err, elf.ErrNoSymbols) {
-		return err
-	}
-
-	syms = append(syms, dynsyms...)
-
-	for _, s := range syms {
-		if elf.ST_TYPE(s.Info) != elf.STT_FUNC {
-			// Symbol not associated with a function or other executable code.
-			continue
-		}
-
-		address := s.Value
-
-		// Loop over ELF segments.
-		for _, prog := range f.Progs {
-			// Skip uninteresting segments.
-			if prog.Type != elf.PT_LOAD || (prog.Flags&elf.PF_X) == 0 {
-				continue
-			}
-
-			if prog.Vaddr <= s.Value && s.Value < (prog.Vaddr+prog.Memsz) {
-				// If the symbol value is contained in the segment, calculate
-				// the symbol offset.
-				//
-				// fn symbol offset = fn symbol VA - .text VA + .text offset
-				//
-				// stackoverflow.com/a/40249502
-				address = s.Value - prog.Vaddr + prog.Off
-				break
-			}
-		}
-
-		ex.addresses[s.Name] = address
-	}
-
-	return nil
-}
-
-// address calculates the address of a symbol in the executable.
-//
-// opts must not be nil.
-func (ex *Executable) address(symbol string, opts *UprobeOptions) (uint64, error) {
-	if opts.Address > 0 {
-		return opts.Address + opts.Offset, nil
-	}
-
-	address, ok := ex.addresses[symbol]
-	if !ok {
-		return 0, fmt.Errorf("symbol %s: %w", symbol, ErrNoSymbol)
-	}
-
-	// Symbols with location 0 from section undef are shared library calls and
-	// are relocated before the binary is executed. Dynamic linking is not
-	// implemented by the library, so mark this as unsupported for now.
-	//
-	// Since only offset values are stored and not elf.Symbol, if the value is 0,
-	// assume it's an external symbol.
-	if address == 0 {
-		return 0, fmt.Errorf("cannot resolve %s library call '%s': %w "+
-			"(consider providing UprobeOptions.Address)", ex.path, symbol, ErrNotSupported)
-	}
-
-	return address + opts.Offset, nil
-}
-
-// Uprobe attaches the given eBPF program to a perf event that fires when the
-// given symbol starts executing in the given Executable.
-// For example, /bin/bash::main():
-//
-//  ex, _ = OpenExecutable("/bin/bash")
-//  ex.Uprobe("main", prog, nil)
-//
-// When using symbols which belongs to shared libraries,
-// an offset must be provided via options:
-//
-//  up, err := ex.Uprobe("main", prog, &UprobeOptions{Offset: 0x123})
-//
-// Note: Setting the Offset field in the options supersedes the symbol's offset.
-//
-// Losing the reference to the resulting Link (up) will close the Uprobe
-// and prevent further execution of prog. The Link must be Closed during
-// program shutdown to avoid leaking system resources.
-//
-// Functions provided by shared libraries can currently not be traced and
-// will result in an ErrNotSupported.
-func (ex *Executable) Uprobe(symbol string, prog *ebpf.Program, opts *UprobeOptions) (Link, error) {
-	u, err := ex.uprobe(symbol, prog, opts, false)
-	if err != nil {
-		return nil, err
-	}
-
-	lnk, err := attachPerfEvent(u, prog)
-	if err != nil {
-		u.Close()
-		return nil, err
-	}
-
-	return lnk, nil
-}
-
-// Uretprobe attaches the given eBPF program to a perf event that fires right
-// before the given symbol exits. For example, /bin/bash::main():
-//
-//  ex, _ = OpenExecutable("/bin/bash")
-//  ex.Uretprobe("main", prog, nil)
-//
-// When using symbols which belongs to shared libraries,
-// an offset must be provided via options:
-//
-//  up, err := ex.Uretprobe("main", prog, &UprobeOptions{Offset: 0x123})
-//
-// Note: Setting the Offset field in the options supersedes the symbol's offset.
-//
-// Losing the reference to the resulting Link (up) will close the Uprobe
-// and prevent further execution of prog. The Link must be Closed during
-// program shutdown to avoid leaking system resources.
-//
-// Functions provided by shared libraries can currently not be traced and
-// will result in an ErrNotSupported.
-func (ex *Executable) Uretprobe(symbol string, prog *ebpf.Program, opts *UprobeOptions) (Link, error) {
-	u, err := ex.uprobe(symbol, prog, opts, true)
-	if err != nil {
-		return nil, err
-	}
-
-	lnk, err := attachPerfEvent(u, prog)
-	if err != nil {
-		u.Close()
-		return nil, err
-	}
-
-	return lnk, nil
-}
-
-// uprobe opens a perf event for the given binary/symbol and attaches prog to it.
-// If ret is true, create a uretprobe.
-func (ex *Executable) uprobe(symbol string, prog *ebpf.Program, opts *UprobeOptions, ret bool) (*perfEvent, error) {
-	if prog == nil {
-		return nil, fmt.Errorf("prog cannot be nil: %w", errInvalidInput)
-	}
-	if prog.Type() != ebpf.Kprobe {
-		return nil, fmt.Errorf("eBPF program type %s is not Kprobe: %w", prog.Type(), errInvalidInput)
-	}
-	if opts == nil {
-		opts = &UprobeOptions{}
-	}
-
-	offset, err := ex.address(symbol, opts)
-	if err != nil {
-		return nil, err
-	}
-
-	pid := opts.PID
-	if pid == 0 {
-		pid = perfAllThreads
-	}
-
-	if opts.RefCtrOffset != 0 {
-		if err := haveRefCtrOffsetPMU(); err != nil {
-			return nil, fmt.Errorf("uprobe ref_ctr_offset: %w", err)
-		}
-	}
-
-	args := probeArgs{
-		symbol:       symbol,
-		path:         ex.path,
-		offset:       offset,
-		pid:          pid,
-		refCtrOffset: opts.RefCtrOffset,
-		ret:          ret,
-		cookie:       opts.Cookie,
-	}
-
-	// Use uprobe PMU if the kernel has it available.
-	tp, err := pmuUprobe(args)
-	if err == nil {
-		return tp, nil
-	}
-	if err != nil && !errors.Is(err, ErrNotSupported) {
-		return nil, fmt.Errorf("creating perf_uprobe PMU: %w", err)
-	}
-
-	// Use tracefs if uprobe PMU is missing.
-	args.symbol = sanitizeSymbol(symbol)
-	tp, err = tracefsUprobe(args)
-	if err != nil {
-		return nil, fmt.Errorf("creating trace event '%s:%s' in tracefs: %w", ex.path, symbol, err)
-	}
-
-	return tp, nil
-}
-
-// pmuUprobe opens a perf event based on the uprobe PMU.
-func pmuUprobe(args probeArgs) (*perfEvent, error) {
-	return pmuProbe(uprobeType, args)
-}
-
-// tracefsUprobe creates a Uprobe tracefs entry.
-func tracefsUprobe(args probeArgs) (*perfEvent, error) {
-	return tracefsProbe(uprobeType, args)
-}
-
-// sanitizeSymbol replaces every invalid character for the tracefs api with an underscore.
-// It is equivalent to calling regexp.MustCompile("[^a-zA-Z0-9]+").ReplaceAllString("_").
-func sanitizeSymbol(s string) string {
-	var b strings.Builder
-	b.Grow(len(s))
-	var skip bool
-	for _, c := range []byte(s) {
-		switch {
-		case c >= 'a' && c <= 'z',
-			c >= 'A' && c <= 'Z',
-			c >= '0' && c <= '9':
-			skip = false
-			b.WriteByte(c)
-
-		default:
-			if !skip {
-				b.WriteByte('_')
-				skip = true
-			}
-		}
-	}
-
-	return b.String()
-}
-
-// uprobeToken creates the PATH:OFFSET(REF_CTR_OFFSET) token for the tracefs api.
-func uprobeToken(args probeArgs) string {
-	po := fmt.Sprintf("%s:%#x", args.path, args.offset)
-
-	if args.refCtrOffset != 0 {
-		// This is not documented in Documentation/trace/uprobetracer.txt.
-		// elixir.bootlin.com/linux/v5.15-rc7/source/kernel/trace/trace.c#L5564
-		po += fmt.Sprintf("(%#x)", args.refCtrOffset)
-	}
-
-	return po
-}
-
-func uretprobeBit() (uint64, error) {
-	uprobeRetprobeBit.once.Do(func() {
-		uprobeRetprobeBit.value, uprobeRetprobeBit.err = determineRetprobeBit(uprobeType)
-	})
-	return uprobeRetprobeBit.value, uprobeRetprobeBit.err
-}