1 2 /*--------------------------------------------------------------------*/ 3 /*--- Client-space code for the core. vg_preloaded.c ---*/ 4 /*--------------------------------------------------------------------*/ 5 6 /* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2000-2012 Julian Seward 11 jseward (at) acm.org 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 26 02111-1307, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29 */ 30 31 32 /* --------------------------------------------------------------------- 33 ALL THE CODE IN THIS FILE RUNS ON THE SIMULATED CPU. 34 35 These functions are not called directly - they're the targets of code 36 redirection or load notifications (see pub_core_redir.h for info). 37 They're named weirdly so that the intercept code can find them when the 38 shared object is initially loaded. 39 40 Note that this filename has the "vg_" prefix because it can appear 41 in stack traces, and the "vg_" makes it a little clearer that it 42 originates from Valgrind. 43 ------------------------------------------------------------------ */ 44 45 #include "pub_core_basics.h" 46 #include "pub_core_clreq.h" 47 #include "pub_core_debuginfo.h" // Needed for pub_core_redir.h 48 #include "pub_core_redir.h" // For VG_NOTIFY_ON_LOAD 49 50 #if defined(VGO_linux) 51 52 /* --------------------------------------------------------------------- 53 Hook for running __libc_freeres once the program exits. 54 ------------------------------------------------------------------ */ 55 56 void VG_NOTIFY_ON_LOAD(freeres)( void ); 57 void VG_NOTIFY_ON_LOAD(freeres)( void ) 58 { 59 # if !defined(__UCLIBC__) \ 60 && !defined(VGPV_arm_linux_android) && !defined(VGPV_x86_linux_android) 61 extern void __libc_freeres(void); 62 __libc_freeres(); 63 # endif 64 VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__LIBC_FREERES_DONE, 65 0, 0, 0, 0, 0); 66 /*NOTREACHED*/ 67 *(volatile int *)0 = 'x'; 68 } 69 70 /* --------------------------------------------------------------------- 71 Wrapper for indirect functions which need to be redirected. 72 ------------------------------------------------------------------ */ 73 74 void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void); 75 void * VG_NOTIFY_ON_LOAD(ifunc_wrapper) (void) 76 { 77 OrigFn fn; 78 Addr result = 0; 79 80 /* Call the original indirect function and get it's result */ 81 VALGRIND_GET_ORIG_FN(fn); 82 CALL_FN_W_v(result, fn); 83 84 /* Ask the valgrind core running on the real CPU (as opposed to this 85 code which runs on the emulated CPU) to update the redirection that 86 led to this function. This client request eventually gives control to 87 the function VG_(redir_add_ifunc_target) in m_redir.c */ 88 VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__ADD_IFUNC_TARGET, 89 fn.nraddr, result, 0, 0, 0); 90 return (void*)result; 91 } 92 93 #elif defined(VGO_darwin) 94 95 #include "config.h" /* VERSION */ 96 97 /* --------------------------------------------------------------------- 98 Darwin crash log hints 99 ------------------------------------------------------------------ */ 100 101 /* This string will be inserted into crash logs, so crashes while 102 running under Valgrind can be distinguished from other crashes. */ 103 __private_extern__ char *__crashreporter_info__ = "Instrumented by Valgrind " VERSION; 104 105 /* --------------------------------------------------------------------- 106 Darwin environment cleanup 107 ------------------------------------------------------------------ */ 108 109 /* Scrubbing DYLD_INSERT_LIBRARIES from envp during exec is insufficient, 110 as there are other ways to launch a process with environment that 111 valgrind can't catch easily (i.e. launchd). 112 Instead, scrub DYLD_INSERT_LIBRARIES from the parent process once 113 dyld is done loading vg_preload.so. 114 */ 115 #include <string.h> 116 #include <crt_externs.h> 117 118 // GrP fixme copied from m_libcproc 119 static void env_unsetenv ( Char **env, const Char *varname ) 120 { 121 Char **from; 122 Char **to = NULL; 123 Int len = strlen(varname); 124 125 for (from = to = env; from && *from; from++) { 126 if (!(strncmp(varname, *from, len) == 0 && (*from)[len] == '=')) { 127 *to = *from; 128 to++; 129 } 130 } 131 *(to++) = *(from++); 132 /* fix the 4th "char* apple" pointer (aka. executable path pointer) */ 133 *(to++) = *(from++); 134 *to = NULL; 135 } 136 137 static void vg_cleanup_env(void) __attribute__((constructor)); 138 static void vg_cleanup_env(void) 139 { 140 Char **envp = (Char**)*_NSGetEnviron(); 141 env_unsetenv(envp, "VALGRIND_LAUNCHER"); 142 env_unsetenv(envp, "DYLD_SHARED_REGION"); 143 // GrP fixme should be more like mash_colon_env() 144 env_unsetenv(envp, "DYLD_INSERT_LIBRARIES"); 145 } 146 147 /* --------------------------------------------------------------------- 148 Darwin arc4random (rdar://6166275) 149 ------------------------------------------------------------------ */ 150 151 #include <fcntl.h> 152 #include <unistd.h> 153 154 int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void); 155 int VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random)(void) 156 { 157 static int rnd = -1; 158 int result; 159 160 if (rnd < 0) rnd = open("/dev/random", O_RDONLY); 161 162 read(rnd, &result, sizeof(result)); 163 return result; 164 } 165 166 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void); 167 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_stir)(void) 168 { 169 // do nothing 170 } 171 172 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen); 173 void VG_REPLACE_FUNCTION_ZU(libSystemZdZaZddylib, arc4random_addrandom)(unsigned char *dat, int datlen) 174 { 175 // do nothing 176 // GrP fixme ought to check [dat..dat+datlen) is defined 177 // but don't care if it's initialized 178 } 179 180 #else 181 182 # error Unknown OS 183 #endif 184 185 /*--------------------------------------------------------------------*/ 186 /*--- end ---*/ 187 /*--------------------------------------------------------------------*/ 188
