1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- Client-space code for the core. vg_preloaded.c ---*/ 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This file is part of Valgrind, a dynamic binary instrumentation 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown framework. 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 10663860b1408516d02ebfcb3a9999a134e6cfb223Ben Cheng Copyright (C) 2000-2012 Julian Seward 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown jseward@acm.org 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is free software; you can redistribute it and/or 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown modify it under the terms of the GNU General Public License as 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown published by the Free Software Foundation; either version 2 of the 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown License, or (at your option) any later version. 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is distributed in the hope that it will be useful, but 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown WITHOUT ANY WARRANTY; without even the implied warranty of 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown General Public License for more details. 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown You should have received a copy of the GNU General Public License 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown along with this program; if not, write to the Free Software 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 02111-1307, USA. 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The GNU General Public License is contained in the file COPYING. 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* --------------------------------------------------------------------- 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ALL THE CODE IN THIS FILE RUNS ON THE SIMULATED CPU. 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown These functions are not called directly - they're the targets of code 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown redirection or load notifications (see pub_core_redir.h for info). 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown They're named weirdly so that the intercept code can find them when the 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown shared object is initially loaded. 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Note that this filename has the "vg_" prefix because it can appear 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown in stack traces, and the "vg_" makes it a little clearer that it 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown originates from Valgrind. 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ------------------------------------------------------------------ */ 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_basics.h" 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_clreq.h" 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_debuginfo.h" // Needed for pub_core_redir.h 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_redir.h" // For VG_NOTIFY_ON_LOAD 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 50b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov#if defined(VGO_linux) 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* --------------------------------------------------------------------- 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Hook for running __libc_freeres once the program exits. 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ------------------------------------------------------------------ */ 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_NOTIFY_ON_LOAD(freeres)( void ); 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_NOTIFY_ON_LOAD(freeres)( void ) 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 59663860b1408516d02ebfcb3a9999a134e6cfb223Ben Cheng# if !defined(__UCLIBC__) \ 60663860b1408516d02ebfcb3a9999a134e6cfb223Ben Cheng && !defined(VGPV_arm_linux_android) && !defined(VGPV_x86_linux_android) 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown extern void __libc_freeres(void); 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown __libc_freeres(); 63b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov# endif 64b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__LIBC_FREERES_DONE, 65b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov 0, 0, 0, 0, 0); 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /*NOTREACHED*/ 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *(volatile int *)0 = 'x'; 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* --------------------------------------------------------------------- 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Wrapper for indirect functions which need to be redirected. 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ------------------------------------------------------------------ */ 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void); 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void) 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown OrigFn fn; 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Addr result = 0; 79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Call the original indirect function and get it's result */ 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VALGRIND_GET_ORIG_FN(fn); 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown CALL_FN_W_v(result, fn); 83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 84ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Ask the valgrind core running on the real CPU (as opposed to this 85ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown code which runs on the emulated CPU) to update the redirection that 86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown led to this function. This client request eventually gives control to 87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown the function VG_(redir_add_ifunc_target) in m_redir.c */ 88b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__ADD_IFUNC_TARGET, 89b32f58018498ea2225959b0ba11c18f0c433deefEvgeniy Stepanov fn.nraddr, result, 0, 0, 0); 90ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return (void*)result; 91ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 92ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 93ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#elif defined(VGO_darwin) 94ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 95ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "config.h" /* VERSION */ 96ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 97ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* --------------------------------------------------------------------- 98ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Darwin crash log hints 99ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ------------------------------------------------------------------ */ 100ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 101ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* This string will be inserted into crash logs, so crashes while 102ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown running under Valgrind can be distinguished from other crashes. */ 103ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown__private_extern__ char *__crashreporter_info__ = "Instrumented by Valgrind " VERSION; 104ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 105ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* --------------------------------------------------------------------- 106ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Darwin environment cleanup 107ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ------------------------------------------------------------------ */ 108ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 109ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* Scrubbing DYLD_INSERT_LIBRARIES from envp during exec is insufficient, 110ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown as there are other ways to launch a process with environment that 111ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown valgrind can't catch easily (i.e. launchd). 112ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Instead, scrub DYLD_INSERT_LIBRARIES from the parent process once 113ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown dyld is done loading vg_preload.so. 114ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 115ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <string.h> 116ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <crt_externs.h> 117ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 118ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// GrP fixme copied from m_libcproc 119ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void env_unsetenv ( Char **env, const Char *varname ) 120ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 121ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Char **from; 122ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Char **to = NULL; 123ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int len = strlen(varname); 124ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 125ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown for (from = to = env; from && *from; from++) { 126ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!(strncmp(varname, *from, len) == 0 && (*from)[len] == '=')) { 127ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *to = *from; 128ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown to++; 129ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 130ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 131ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *(to++) = *(from++); 132ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* fix the 4th "char* apple" pointer (aka. executable path pointer) */ 133ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *(to++) = *(from++); 134ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *to = NULL; 135ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 136ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 137ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void vg_cleanup_env(void) __attribute__((constructor)); 138ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void vg_cleanup_env(void) 139ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 140ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Char **envp = (Char**)*_NSGetEnviron(); 141ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown env_unsetenv(envp, "VALGRIND_LAUNCHER"); 142ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown env_unsetenv(envp, "DYLD_SHARED_REGION"); 143ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // GrP fixme should be more like mash_colon_env() 144ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown env_unsetenv(envp, "DYLD_INSERT_LIBRARIES"); 145ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 146ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 147ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* --------------------------------------------------------------------- 148ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Darwin arc4random (rdar://6166275) 149ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ------------------------------------------------------------------ */ 150ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 151ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <fcntl.h> 152ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <unistd.h> 153ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 154ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void); 155ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void) 156ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 157ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown static int rnd = -1; 158ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int result; 159ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 160ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (rnd < 0) rnd = open("/dev/random", O_RDONLY); 161ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 162ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown read(rnd, &result, sizeof(result)); 163ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return result; 164ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 165ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 166ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void); 167ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void) 168ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 169ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // do nothing 170ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 171ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 172ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen); 173ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownvoid VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen) 174ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 175ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // do nothing 176ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // GrP fixme ought to check [dat..dat+datlen) is defined 177ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // but don't care if it's initialized 178ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 179ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 180ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#else 181ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 182ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown# error Unknown OS 183ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 184ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 185ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 186ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- end ---*/ 187ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 188