mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-31 07:52:25 -05:00
[chore]: Bump github.com/KimMachineGun/automemlimit from 0.2.4 to 0.2.5 (#1666)
Bumps [github.com/KimMachineGun/automemlimit](https://github.com/KimMachineGun/automemlimit) from 0.2.4 to 0.2.5. - [Release notes](https://github.com/KimMachineGun/automemlimit/releases) - [Commits](https://github.com/KimMachineGun/automemlimit/compare/v0.2.4...v0.2.5) --- updated-dependencies: - dependency-name: github.com/KimMachineGun/automemlimit dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
This commit is contained in:
dependabot[bot]
GitHub
parent
3f9b2336c0
commit
57dc742c76
200 changed files with 16392 additions and 38190 deletions
299
vendor/github.com/cilium/ebpf/linker.go
generated
vendored
299
vendor/github.com/cilium/ebpf/linker.go
generated
vendored
|
|
@ -1,133 +1,238 @@
|
|||
package ebpf
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"sync"
|
||||
|
||||
"github.com/cilium/ebpf/asm"
|
||||
"github.com/cilium/ebpf/internal/btf"
|
||||
"github.com/cilium/ebpf/btf"
|
||||
)
|
||||
|
||||
// link resolves bpf-to-bpf calls.
|
||||
// splitSymbols splits insns into subsections delimited by Symbol Instructions.
|
||||
// insns cannot be empty and must start with a Symbol Instruction.
|
||||
//
|
||||
// Each library may contain multiple functions / labels, and is only linked
|
||||
// if prog references one of these functions.
|
||||
// The resulting map is indexed by Symbol name.
|
||||
func splitSymbols(insns asm.Instructions) (map[string]asm.Instructions, error) {
|
||||
if len(insns) == 0 {
|
||||
return nil, errors.New("insns is empty")
|
||||
}
|
||||
|
||||
if insns[0].Symbol() == "" {
|
||||
return nil, errors.New("insns must start with a Symbol")
|
||||
}
|
||||
|
||||
var name string
|
||||
progs := make(map[string]asm.Instructions)
|
||||
for _, ins := range insns {
|
||||
if sym := ins.Symbol(); sym != "" {
|
||||
if progs[sym] != nil {
|
||||
return nil, fmt.Errorf("insns contains duplicate Symbol %s", sym)
|
||||
}
|
||||
name = sym
|
||||
}
|
||||
|
||||
progs[name] = append(progs[name], ins)
|
||||
}
|
||||
|
||||
return progs, nil
|
||||
}
|
||||
|
||||
// The linker is responsible for resolving bpf-to-bpf calls between programs
|
||||
// within an ELF. Each BPF program must be a self-contained binary blob,
|
||||
// so when an instruction in one ELF program section wants to jump to
|
||||
// a function in another, the linker needs to pull in the bytecode
|
||||
// (and BTF info) of the target function and concatenate the instruction
|
||||
// streams.
|
||||
//
|
||||
// Libraries also linked.
|
||||
func link(prog *ProgramSpec, libs []*ProgramSpec) error {
|
||||
var (
|
||||
linked = make(map[*ProgramSpec]bool)
|
||||
pending = []asm.Instructions{prog.Instructions}
|
||||
insns asm.Instructions
|
||||
)
|
||||
for len(pending) > 0 {
|
||||
insns, pending = pending[0], pending[1:]
|
||||
for _, lib := range libs {
|
||||
if linked[lib] {
|
||||
continue
|
||||
}
|
||||
// Later on in the pipeline, all call sites are fixed up with relative jumps
|
||||
// within this newly-created instruction stream to then finally hand off to
|
||||
// the kernel with BPF_PROG_LOAD.
|
||||
//
|
||||
// Each function is denoted by an ELF symbol and the compiler takes care of
|
||||
// register setup before each jump instruction.
|
||||
|
||||
needed, err := needSection(insns, lib.Instructions)
|
||||
if err != nil {
|
||||
return fmt.Errorf("linking %s: %w", lib.Name, err)
|
||||
}
|
||||
// hasFunctionReferences returns true if insns contains one or more bpf2bpf
|
||||
// function references.
|
||||
func hasFunctionReferences(insns asm.Instructions) bool {
|
||||
for _, i := range insns {
|
||||
if i.IsFunctionReference() {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
if !needed {
|
||||
continue
|
||||
}
|
||||
// applyRelocations collects and applies any CO-RE relocations in insns.
|
||||
//
|
||||
// Passing a nil target will relocate against the running kernel. insns are
|
||||
// modified in place.
|
||||
func applyRelocations(insns asm.Instructions, local, target *btf.Spec) error {
|
||||
var relos []*btf.CORERelocation
|
||||
var reloInsns []*asm.Instruction
|
||||
iter := insns.Iterate()
|
||||
for iter.Next() {
|
||||
if relo := btf.CORERelocationMetadata(iter.Ins); relo != nil {
|
||||
relos = append(relos, relo)
|
||||
reloInsns = append(reloInsns, iter.Ins)
|
||||
}
|
||||
}
|
||||
|
||||
linked[lib] = true
|
||||
prog.Instructions = append(prog.Instructions, lib.Instructions...)
|
||||
pending = append(pending, lib.Instructions)
|
||||
if len(relos) == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
if prog.BTF != nil && lib.BTF != nil {
|
||||
if err := btf.ProgramAppend(prog.BTF, lib.BTF); err != nil {
|
||||
return fmt.Errorf("linking BTF of %s: %w", lib.Name, err)
|
||||
}
|
||||
}
|
||||
target, err := maybeLoadKernelBTF(target)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
fixups, err := btf.CORERelocate(local, target, relos)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
for i, fixup := range fixups {
|
||||
if err := fixup.Apply(reloInsns[i]); err != nil {
|
||||
return fmt.Errorf("apply fixup %s: %w", &fixup, err)
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func needSection(insns, section asm.Instructions) (bool, error) {
|
||||
// A map of symbols to the libraries which contain them.
|
||||
symbols, err := section.SymbolOffsets()
|
||||
if err != nil {
|
||||
return false, err
|
||||
// flattenPrograms resolves bpf-to-bpf calls for a set of programs.
|
||||
//
|
||||
// Links all programs in names by modifying their ProgramSpec in progs.
|
||||
func flattenPrograms(progs map[string]*ProgramSpec, names []string) {
|
||||
// Pre-calculate all function references.
|
||||
refs := make(map[*ProgramSpec][]string)
|
||||
for _, prog := range progs {
|
||||
refs[prog] = prog.Instructions.FunctionReferences()
|
||||
}
|
||||
|
||||
for _, ins := range insns {
|
||||
if ins.Reference == "" {
|
||||
continue
|
||||
}
|
||||
|
||||
if ins.OpCode.JumpOp() != asm.Call || ins.Src != asm.PseudoCall {
|
||||
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, so we have to link it.
|
||||
return true, nil
|
||||
// Create a flattened instruction stream, but don't modify progs yet to
|
||||
// avoid linking multiple times.
|
||||
flattened := make([]asm.Instructions, 0, len(names))
|
||||
for _, name := range names {
|
||||
flattened = append(flattened, flattenInstructions(name, progs, refs))
|
||||
}
|
||||
|
||||
// None of the functions in the section are called.
|
||||
return false, nil
|
||||
// Finally, assign the flattened instructions.
|
||||
for i, name := range names {
|
||||
progs[name].Instructions = flattened[i]
|
||||
}
|
||||
}
|
||||
|
||||
func fixupJumpsAndCalls(insns asm.Instructions) error {
|
||||
symbolOffsets := make(map[string]asm.RawInstructionOffset)
|
||||
// flattenInstructions resolves bpf-to-bpf calls for a single program.
|
||||
//
|
||||
// Flattens the instructions of prog by concatenating the instructions of all
|
||||
// direct and indirect dependencies.
|
||||
//
|
||||
// progs contains all referenceable programs, while refs contain the direct
|
||||
// dependencies of each program.
|
||||
func flattenInstructions(name string, progs map[string]*ProgramSpec, refs map[*ProgramSpec][]string) asm.Instructions {
|
||||
prog := progs[name]
|
||||
|
||||
insns := make(asm.Instructions, len(prog.Instructions))
|
||||
copy(insns, prog.Instructions)
|
||||
|
||||
// Add all direct references of prog to the list of to be linked programs.
|
||||
pending := make([]string, len(refs[prog]))
|
||||
copy(pending, refs[prog])
|
||||
|
||||
// All references for which we've appended instructions.
|
||||
linked := make(map[string]bool)
|
||||
|
||||
// Iterate all pending references. We can't use a range since pending is
|
||||
// modified in the body below.
|
||||
for len(pending) > 0 {
|
||||
var ref string
|
||||
ref, pending = pending[0], pending[1:]
|
||||
|
||||
if linked[ref] {
|
||||
// We've already linked this ref, don't append instructions again.
|
||||
continue
|
||||
}
|
||||
|
||||
progRef := progs[ref]
|
||||
if progRef == nil {
|
||||
// We don't have instructions that go with this reference. This
|
||||
// happens when calling extern functions.
|
||||
continue
|
||||
}
|
||||
|
||||
insns = append(insns, progRef.Instructions...)
|
||||
linked[ref] = true
|
||||
|
||||
// Make sure we link indirect references.
|
||||
pending = append(pending, refs[progRef]...)
|
||||
}
|
||||
|
||||
return insns
|
||||
}
|
||||
|
||||
// fixupAndValidate is called by the ELF reader right before marshaling the
|
||||
// instruction stream. It performs last-minute adjustments to the program and
|
||||
// runs some sanity checks before sending it off to the kernel.
|
||||
func fixupAndValidate(insns asm.Instructions) error {
|
||||
iter := insns.Iterate()
|
||||
for iter.Next() {
|
||||
ins := iter.Ins
|
||||
|
||||
if ins.Symbol == "" {
|
||||
continue
|
||||
// Map load was tagged with a Reference, but does not contain a Map pointer.
|
||||
if ins.IsLoadFromMap() && ins.Reference() != "" && ins.Map() == nil {
|
||||
return fmt.Errorf("instruction %d: map %s: %w", iter.Index, ins.Reference(), asm.ErrUnsatisfiedMapReference)
|
||||
}
|
||||
|
||||
if _, ok := symbolOffsets[ins.Symbol]; ok {
|
||||
return fmt.Errorf("duplicate symbol %s", ins.Symbol)
|
||||
}
|
||||
|
||||
symbolOffsets[ins.Symbol] = iter.Offset
|
||||
}
|
||||
|
||||
iter = insns.Iterate()
|
||||
for iter.Next() {
|
||||
i := iter.Index
|
||||
offset := iter.Offset
|
||||
ins := iter.Ins
|
||||
|
||||
switch {
|
||||
case ins.IsFunctionCall() && ins.Constant == -1:
|
||||
// Rewrite bpf to bpf call
|
||||
callOffset, ok := symbolOffsets[ins.Reference]
|
||||
if !ok {
|
||||
return fmt.Errorf("instruction %d: reference to missing symbol %q", i, ins.Reference)
|
||||
}
|
||||
|
||||
ins.Constant = int64(callOffset - offset - 1)
|
||||
|
||||
case ins.OpCode.Class() == asm.JumpClass && ins.Offset == -1:
|
||||
// Rewrite jump to label
|
||||
jumpOffset, ok := symbolOffsets[ins.Reference]
|
||||
if !ok {
|
||||
return fmt.Errorf("instruction %d: reference to missing symbol %q", i, ins.Reference)
|
||||
}
|
||||
|
||||
ins.Offset = int16(jumpOffset - offset - 1)
|
||||
}
|
||||
fixupProbeReadKernel(ins)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// fixupProbeReadKernel replaces calls to bpf_probe_read_{kernel,user}(_str)
|
||||
// with bpf_probe_read(_str) on kernels that don't support it yet.
|
||||
func fixupProbeReadKernel(ins *asm.Instruction) {
|
||||
if !ins.IsBuiltinCall() {
|
||||
return
|
||||
}
|
||||
|
||||
// Kernel supports bpf_probe_read_kernel, nothing to do.
|
||||
if haveProbeReadKernel() == nil {
|
||||
return
|
||||
}
|
||||
|
||||
switch asm.BuiltinFunc(ins.Constant) {
|
||||
case asm.FnProbeReadKernel, asm.FnProbeReadUser:
|
||||
ins.Constant = int64(asm.FnProbeRead)
|
||||
case asm.FnProbeReadKernelStr, asm.FnProbeReadUserStr:
|
||||
ins.Constant = int64(asm.FnProbeReadStr)
|
||||
}
|
||||
}
|
||||
|
||||
var kernelBTF struct {
|
||||
sync.Mutex
|
||||
spec *btf.Spec
|
||||
}
|
||||
|
||||
// maybeLoadKernelBTF loads the current kernel's BTF if spec is nil, otherwise
|
||||
// it returns spec unchanged.
|
||||
//
|
||||
// The kernel BTF is cached for the lifetime of the process.
|
||||
func maybeLoadKernelBTF(spec *btf.Spec) (*btf.Spec, error) {
|
||||
if spec != nil {
|
||||
return spec, nil
|
||||
}
|
||||
|
||||
kernelBTF.Lock()
|
||||
defer kernelBTF.Unlock()
|
||||
|
||||
if kernelBTF.spec != nil {
|
||||
return kernelBTF.spec, nil
|
||||
}
|
||||
|
||||
var err error
|
||||
kernelBTF.spec, err = btf.LoadKernelSpec()
|
||||
return kernelBTF.spec, err
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue