bnoordhuis

"use strict"
const inspector = require("node:inspector/promises")
const session = new inspector.Session()
session.connect()
countPromises(session).then(console.log)

async function countPromises(session) {
    // resource management: put all results in an object group
    const objectGroup = crypto.randomUUID()

bnoordhuis

A system crash at an inopportune time left my file system in a corrupted state. Fixing it up with fsck(1) worked just fine but made a subsequent system upgrade fail with an unusual error:

dpkg: error processing /var/cache/apt/archives/libfoo-1.2.3_amd64.deb (--unpack):
unable to install (supposed) new info file `/var/lib/dpkg/tmp.ci/symbols': Operation not permitted

The directory /var/lib/dpkg/tmp.ci did not exist. Creating it manually and re-running the upgrade failed exactly the same way (and removed the directory again.)

bnoordhuis

" vim > vi
set nocompatible

syntax on
filetype on
filetype plugin on
filetype indent on

" auto reload changes files (that don't have unsaved changes)
set autoread

bnoordhuis

// Copyright (c) 2019, Ben Noordhuis <[email protected]>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

bnoordhuis

// Copyright (c) 2017, Ben Noordhuis <[email protected]>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

bnoordhuis

diff --git a/tools/clang/include/clang/Driver/Options.td b/tools/clang/include/clang/Driver/Options.td
index d03ab04..0e03a0a 100644
--- a/tools/clang/include/clang/Driver/Options.td
+++ b/tools/clang/include/clang/Driver/Options.td
@@ -479,6 +479,12 @@ def fno_autolink : Flag <["-"], "fno-autolink">, Group<f_Group>,
   Flags<[DriverOption, CC1Option]>,
   HelpText<"Disable generation of linker directives for automatic library linking">;
 
+def fdelete_null_pointer_checks : Flag<["-"], "fdelete-null-pointer-checks">,
+    Group<f_Group>, Flags<[CC1Option]>,

bnoordhuis

user mode linux: build and run

Generate default .config.

$ make defconfig ARCH=um SUBARCH=x86_64

Build the linux ELF binary.

$ make -j8 linux ARCH=um SUBARCH=x86_64

bnoordhuis

// scons mode=debug arch=x64
// g++ -m64 -Wall -ggdb stack-guard.cc -Iinclude libv8_g.a -lpthread && ./a.out; echo "$?"
//
// gcc version 4.4.5 (Debian 4.4.5-8)
// http://v8.googlecode.com/svn/trunk@r6858
//
// Repros on x64, does not repro in ia32
#include "v8.h"
#include <iostream>
#include <assert.h>

bnoordhuis

// Crashes OS X 10.8, `cc un.c && while :; do ./a.out ; done` to run.
// The buffer overflow usually gets triggered within the first three
// or four runs.  Make sure you back up your data first!

#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <sys/socket.h>

bnoordhuis

// Copyright (c) 2014, Ben Noordhuis <[email protected]>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES