thejh

# perf stat -e task-clock:u -e cycles:u -e instructions:u -e branches:u -e branch-misses:u -e dTLB-loads:u -e dTLB-load-misses:u -e dtlb_load_misses.walk_active:u ./spec_test map

 Performance counter stats for './spec_test map':

          1,150.38 msec task-clock:u                     #    1.000 CPUs utilized          
     5,370,185,772      cycles:u                         #    4.668 GHz                    
     1,331,717,669      instructions:u                   #    0.25  insn per cycle         
       307,326,910      branches:u                       #  267.153 M/sec                  
       102,502,300      branch-misses:u                  #   33.35% of all branches        
       102,427,183      dTLB-loads                       #   89.038 M/sec                  

thejh

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>

thejh

--- memtester-orig/memtester-4.3.0/tests.c	2012-06-09 23:45:22.000000000 +0200
+++ memtester-4.3.0/tests.c	2018-06-24 18:08:03.194020598 +0200
@@ -11,14 +11,17 @@
  * This file contains the functions for the actual tests, called from the
  * main routine in memtester.c.  See other comments in that file.
  *
  */
 
+#define _GNU_SOURCE
 #include <sys/types.h>

thejh

var Process = process.binding('process_wrap').Process;
var proc = new Process();
proc.onexit = function(a,b) {};
var env = process.env;
var env_ = [];
for (var key in env) env_.push(key+'='+env[key]);
proc.spawn({file:'/bin/sh',args:['sh','-c','id > /tmp/owned'],cwd:null,windowsVerbatimArguments:false,detached:false,envPairs:env_,stdio:[{type:'ignore'},{type:'ignore'},{type:'ignore'}]});

thejh

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>

thejh

github =
  # description: string
  # public: boolean
  # files: {string: content: string}
  postGist: (description, public, files, callback) ->
    request {
      uri: 'https://api.github.com/gists'
      method: 'POST'
      headers:
        'Authorization': BASIC_AUTH_DATA

thejh

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>

thejh

~/tmp/pdf$ cat localtime_hack.c 
#include <time.h>

__attribute__((constructor)) static void localtime_hack(void) {
  time_t t = {0};
  localtime(&t);
}
~/tmp/pdf$ gcc -shared -fPIC -o localtime_hack.so localtime_hack.c 
~/tmp/pdf$ LD_BIND_NOW=1 LD_PRELOAD=./localtime_hack.so strace -f -e trace='!write,pread64,brk' pdftoppm test.pdf test.png 2>&1 | grep -A10000000 'open.*test\.pdf'
openat(AT_FDCWD, "test.pdf", O_RDONLY)  = 3

thejh

From 0bc2bc09d4c23cc5b48cea4bc2fb926a1fa72598 Mon Sep 17 00:00:00 2001
From: Jann Horn <jannh@google.com>
Date: Fri, 12 Apr 2019 16:13:30 +0200
Subject: [PATCH] objtool: Handle multiply-referenced and
 out-of-order-referenced jump tables

With clang from git master, code can be generated where a function contains
two indirect jump instructions that use the same switch table. To deal with
this case and similar ones properly, convert the switch table parsing to
use two passes:

thejh

import os
import struct

# flags are encoded into chunk size
FLAGS_MASK = 0x7
PAGEMAP_PRESENT = 1<<63
PAGEMAP_SWAPPED = 1<<62

main_arena = gdb.parse_and_eval('&main_arena')
bins_per_arena = int(gdb.parse_and_eval(