commit 66aaf6fea4293fdb0f9f233ea612e3b53efc4172 Author: Yawning Angel yawning@schwanenlied.me Date: Thu Apr 13 07:58:01 2017 +0000

Bug 21764: Use bubblewrap's `--die-with-parent` when supported.

Tor Browser nightly (ESR52, e10s) doesn't exit cleanly when SIGINT is sent to `sandboxed-tor-browser` without this. Unfortunately the option requires bubblewrap >= 0.1.8, but at least exiting firefox normally works fine with older bubblewrap. --- ChangeLog | 1 + .../internal/sandbox/hugbox.go | 86 +++++++++++++--------- 2 files changed, 51 insertions(+), 36 deletions(-)

diff --git a/ChangeLog b/ChangeLog index 92ce6c0..d634264 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,4 +1,5 @@ Changes in version 0.0.5 - UNRELEASED: + * Bug 21764: Use bubblewrap's `--die-with-parent` when supported. * Fix e10s Web Content crash on systems with grsec kernels. * Add `prlimit64` to the firefox system call whitelist.

diff --git a/src/cmd/sandboxed-tor-browser/internal/sandbox/hugbox.go b/src/cmd/sandboxed-tor-browser/internal/sandbox/hugbox.go index 118b7a7..dd2e51a 100644 --- a/src/cmd/sandboxed-tor-browser/internal/sandbox/hugbox.go +++ b/src/cmd/sandboxed-tor-browser/internal/sandbox/hugbox.go @@ -91,9 +91,10 @@ type hugbox struct {

// Internal options, not to be *modified* except via helpers, unless you // know what you are doing. - bwrapPath string - args []string - fileData [][]byte + bwrapPath string + bwrapVersion *bwrapVersion + args []string + fileData [][]byte

runtimeDir string // Set at creation time. } @@ -244,6 +245,12 @@ func (h *hugbox) run() (*Process, error) { h.file("/etc/passwd", []byte(passwdBody)) h.file("/etc/group", []byte(groupBody))

+ dieWithParent := h.bwrapVersion.atLeast(0, 1, 8) + if dieWithParent { + Debugf("sandbox: bubblewrap supports `--die-with-parent`.") + fdArgs = append(fdArgs, "--die-with-parent") + } + if h.fakeDbus { h.setupDbus() } @@ -421,23 +428,47 @@ func newHugbox() (*hugbox, error) { return nil, fmt.Errorf("sandbox: unable to find bubblewrap binary") }

- // Bubblewrap <= 0.1.2-2 (in Debian terms, 0.1.3 for the rest of us), is - // a really bad idea because I'm a retard, and didn't expect bubblewrap - // to be ptrace-able when I contributed support for the hostname. - // - // There is a CVE for it. Sensible people have made 0.1.3 available, - // including jessie-backports. Ubuntu is still shipping an old version. - // Sucks to be them. - if ok, err := bubblewrapAtLeast(h.bwrapPath, 0, 1, 3); err != nil { + // Query and cache the bubblewrap version. + var err error + if h.bwrapVersion, err = getBwrapVersion(h.bwrapPath); err != nil { return nil, err - } else if !ok { - return nil, fmt.Errorf("sandbox: bubblewrap appears to be older than 0.1.3, you MUST upgrade.") + } else { + Debugf("sandbox: bubblewrap '%v' detected.", h.bwrapVersion) + + // Bubblewrap <= 0.1.2-2 (in Debian terms, 0.1.3 for the rest of us), + // is a really bad idea because I'm a retard, and didn't expect + // bubblewrap to be ptrace-able when I contributed support for setting + // the hostname. + if !h.bwrapVersion.atLeast(0, 1, 3) { + return nil, fmt.Errorf("sandbox: bubblewrap appears to be older than 0.1.3, you MUST upgrade.") + } }

return h, nil }

-func getBubblewrapVersion(f string) (int, int, int, error) { +type bwrapVersion struct { + maj, min, pl int +} + +func (v *bwrapVersion) atLeast(maj, min, pl int) bool { + if v.maj > maj { + return true + } + if v.maj == maj && v.min > min { + return true + } + if v.maj == maj && v.min == min && v.pl >= pl { + return true + } + return false +} + +func (v *bwrapVersion) String() string { + return fmt.Sprintf("%d.%d.%d", v.maj, v.min, v.pl) +} + +func getBwrapVersion(f string) (*bwrapVersion, error) { cmd := &exec.Cmd{ Path: f, Args: []string{f, "--version"}, @@ -448,7 +479,7 @@ func getBubblewrapVersion(f string) (int, int, int, error) { } out, err := cmd.CombinedOutput() if err != nil { - return 0, 0, 0, fmt.Errorf("sandbox: failed to query bubblewrap version: %v", string(out)) + return nil, fmt.Errorf("sandbox: failed to query bubblewrap version: %v", string(out)) } vStr := strings.TrimPrefix(string(out), "bubblewrap ") vStr = strings.TrimSpace(vStr) @@ -456,37 +487,20 @@ func getBubblewrapVersion(f string) (int, int, int, error) { // Split into major/minor/pl. v := strings.Split(vStr, ".") if len(v) < 3 { - return 0, 0, 0, fmt.Errorf("unable to determine bubblewrap version") + return nil, fmt.Errorf("unable to determine bubblewrap version") }

+ // Parse the version. var iVers [3]int for i := 0; i < 3; i++ { iv, err := strconv.Atoi(v[i]) if err != nil { - return 0, 0, 0, fmt.Errorf("unable to determine bubblewrap version: %v", err) + return nil, fmt.Errorf("unable to parse bubblewrap version: %v", err) } iVers[i] = iv }

- return iVers[0], iVers[1], iVers[2], nil -} - -func bubblewrapAtLeast(f string, maj, min, pl int) (bool, error) { - iMaj, iMin, iPl, err := getBubblewrapVersion(f) - if err != nil { - return false, err - } - - if iMaj > maj { - return true, nil - } - if iMaj == maj && iMin > min { - return true, nil - } - if iMaj == maj && iMin == min && iPl >= pl { - return true, nil - } - return false, nil + return &bwrapVersion{maj: iVers[0], min: iVers[1], pl: iVers[2]}, nil }

func writeBuffer(w io.WriteCloser, contents []byte) error {