main.c revision ed07e00d438c74b7a23c01bfffde77e3968305e4
1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- User-mode execve(), and other stuff shared between stage1 ---*/ 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- and stage2. m_ume.c ---*/ 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This file is part of Valgrind, a dynamic binary instrumentation 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown framework. 10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Copyright (C) 2000-2010 Julian Seward 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown jseward@acm.org 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is free software; you can redistribute it and/or 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown modify it under the terms of the GNU General Public License as 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown published by the Free Software Foundation; either version 2 of the 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown License, or (at your option) any later version. 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This program is distributed in the hope that it will be useful, but 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown WITHOUT ANY WARRANTY; without even the implied warranty of 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown General Public License for more details. 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown You should have received a copy of the GNU General Public License 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown along with this program; if not, write to the Free Software 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 02111-1307, USA. 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The GNU General Public License is contained in the file COPYING. 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown*/ 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_basics.h" 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_vki.h" 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcbase.h" 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcassert.h" // VG_(exit), vg_assert 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcfile.h" // VG_(close) et al 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_libcprint.h" // VG_(message) 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_mallocfree.h" // VG_(strdup) 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_syscall.h" // VG_(mk_SysRes_Error) 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_options.h" // VG_(clo_xml) 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "pub_core_ume.h" // self 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include "priv_ume.h" 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Browntypedef struct { 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Bool (*match_fn)(Char *hdr, Int len); 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int (*load_fn)(Int fd, const HChar *name, ExeInfo *info); 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} ExeHandler; 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic ExeHandler exe_handlers[] = { 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Nb: AIX5 doesn't use m_ume, which is why it's not represented here. 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#if defined(VGO_linux) 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown { VG_(match_ELF), VG_(load_ELF) }, 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#elif defined(VGO_darwin) 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown { VG_(match_macho), VG_(load_macho) }, 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#else 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown# error "unknown OS" 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown { VG_(match_script), VG_(load_script) }, 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown}; 64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#define EXE_HANDLER_COUNT (sizeof(exe_handlers)/sizeof(exe_handlers[0])) 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// Check the file looks executable. 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownSysRes 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownVG_(pre_exec_check)(const HChar* exe_name, Int* out_fd, Bool allow_setuid) 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int fd, ret, i; 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown SysRes res; 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Char buf[4096]; 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown SizeT bufsz = 4096, fsz; 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Bool is_setuid = False; 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Check it's readable 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = VG_(open)(exe_name, VKI_O_RDONLY, 0); 79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (sr_isError(res)) { 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return res; 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown fd = sr_Res(res); 83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 84ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Check we have execute permissions 85ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ret = VG_(check_executable)(&is_setuid, (HChar*)exe_name, allow_setuid); 86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (0 != ret) { 87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(close)(fd); 88ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (is_setuid && !VG_(clo_xml)) { 89ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(message)(Vg_UserMsg, "\n"); 90ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(message)(Vg_UserMsg, 91ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "Warning: Can't execute setuid/setgid executable: %s\n", 92ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exe_name); 93ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(message)(Vg_UserMsg, "Possible workaround: remove " 94ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "--trace-children=yes, if in effect\n"); 95ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(message)(Vg_UserMsg, "\n"); 96ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 97ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return VG_(mk_SysRes_Error)(ret); 98ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 99ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 100ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown fsz = (SizeT)VG_(fsize)(fd); 101ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (fsz < bufsz) 102ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bufsz = fsz; 103ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 104ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = VG_(pread)(fd, buf, bufsz, 0); 105ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (sr_isError(res) || sr_Res(res) != bufsz) { 106ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(close)(fd); 107ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return VG_(mk_SysRes_Error)(VKI_EACCES); 108ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 109ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown bufsz = sr_Res(res); 110ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 111ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Look for a matching executable format 112ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown for (i = 0; i < EXE_HANDLER_COUNT; i++) { 113ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if ((*exe_handlers[i].match_fn)(buf, bufsz)) { 114ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = VG_(mk_SysRes_Success)(i); 115ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown break; 116ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 117ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 118ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (i == EXE_HANDLER_COUNT) { 119ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Rejected by all executable format handlers. 120ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = VG_(mk_SysRes_Error)(VKI_ENOEXEC); 121ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 122ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 123ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Write the 'out_fd' param if necessary, or close the file. 124ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!sr_isError(res) && out_fd) { 125ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown *out_fd = fd; 126ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else { 127ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(close)(fd); 128ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 129ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 130ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return res; 131ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 132ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 133ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// returns: 0 = success, non-0 is failure 134ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// 135ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// We can execute only binaries (ELF, etc) or scripts that begin with "#!". 136ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// (Not, for example, scripts that don't begin with "#!"; see the 137ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// VG_(do_exec)() invocation from m_main.c for how that's handled.) 138ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownInt VG_(do_exec_inner)(const HChar* exe, ExeInfo* info) 139ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 140ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown SysRes res; 141ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int fd; 142ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int ret; 143ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 144ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = VG_(pre_exec_check)(exe, &fd, False/*allow_setuid*/); 145ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (sr_isError(res)) 146ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return sr_Err(res); 147ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 148ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown vg_assert2(sr_Res(res) >= 0 && sr_Res(res) < EXE_HANDLER_COUNT, 149ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "invalid VG_(pre_exec_check) result"); 150ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 151ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ret = (*exe_handlers[sr_Res(res)].load_fn)(fd, exe, info); 152ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 153ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(close)(fd); 154ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 155ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return ret; 156ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 157ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 158ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 159ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic Bool is_hash_bang_file(Char* f) 160ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 161ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown SysRes res = VG_(open)(f, VKI_O_RDONLY, 0); 162ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!sr_isError(res)) { 163ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Char buf[3] = {0,0,0}; 164ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int fd = sr_Res(res); 165ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int n = VG_(read)(fd, buf, 2); 166ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (n == 2 && VG_STREQ("#!", buf)) 167ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return True; 168ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 169ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return False; 170ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 171ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 172ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// Look at the first 80 chars, and if any are greater than 127, it's binary. 173ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// This is crude, but should be good enough. Note that it fails on a 174ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// zero-length file, as we want. 175ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic Bool is_binary_file(Char* f) 176ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 177ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown SysRes res = VG_(open)(f, VKI_O_RDONLY, 0); 178ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!sr_isError(res)) { 179ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown UChar buf[80]; 180ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int fd = sr_Res(res); 181ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int n = VG_(read)(fd, buf, 80); 182ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int i; 183ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown for (i = 0; i < n; i++) { 184ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (buf[i] > 127) 185ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return True; // binary char found 186ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 187ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return False; 188ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else { 189ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Something went wrong. This will only happen if we earlier 190ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // succeeded in opening the file but fail here (eg. the file was 191ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // deleted between then and now). 192ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fmsg)("%s: unknown error\n", f); 193ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(exit)(126); // 126 == NOEXEC 194ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 195ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 196ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 197ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// If the do_exec fails we try to emulate what the shell does (I used 198ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// bash as a guide). It's worth noting that the shell can execute some 199ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// things that VG_(do_exec)() (which subsitutes for the kernel's exec()) 200ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// will refuse to (eg. scripts lacking a "#!" prefix). 201ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic Int do_exec_shell_followup(Int ret, HChar* exe_name, ExeInfo* info) 202ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 203ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Char* default_interp_name = "/bin/sh"; 204ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown SysRes res; 205ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct vg_stat st; 206ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 207ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (VKI_ENOEXEC == ret) { 208ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // It was an executable file, but in an unacceptable format. Probably 209ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // is a shell script lacking the "#!" prefix; try to execute it so. 210ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 211ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Is it a binary file? 212ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (is_binary_file(exe_name)) { 213ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fmsg)("%s: cannot execute binary file\n", exe_name); 214ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(exit)(126); // 126 == NOEXEC 215ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 216ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 217ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Looks like a script. Run it with /bin/sh. This includes 218ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // zero-length files. 219ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 220ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown info->interp_name = VG_(strdup)("ume.desf.1", default_interp_name); 221ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown info->interp_args = NULL; 222ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (info->argv && info->argv[0] != NULL) 223ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown info->argv[0] = (char *)exe_name; 224ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 225ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ret = VG_(do_exec_inner)(info->interp_name, info); 226ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 227ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (0 != ret) { 228ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Something went wrong with executing the default interpreter 229ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fmsg)("%s: bad interpreter (%s): %s\n", 230ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exe_name, info->interp_name, VG_(strerror)(ret)); 231ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(exit)(126); // 126 == NOEXEC 232ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 233ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 234ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else if (0 != ret) { 235ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Something else went wrong. Try to make the error more specific, 236ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // and then print a message and abort. 237ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 238ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Was it a directory? 239ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = VG_(stat)(exe_name, &st); 240ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (!sr_isError(res) && VKI_S_ISDIR(st.mode)) { 241ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fmsg)("%s: is a directory\n", exe_name); 242ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 243ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Was it not executable? 244ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else if (0 != VG_(check_executable)(NULL, exe_name, 245ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown False/*allow_setuid*/)) { 246ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fmsg)("%s: %s\n", exe_name, VG_(strerror)(ret)); 247ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 248ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Did it start with "#!"? If so, it must have been a bad interpreter. 249ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else if (is_hash_bang_file(exe_name)) { 250ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fmsg)("%s: bad interpreter: %s\n", exe_name, VG_(strerror)(ret)); 251ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 252ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // Otherwise it was something else. 253ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } else { 254ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(fmsg)("%s: %s\n", exe_name, VG_(strerror)(ret)); 255ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 256ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // 126 means NOEXEC; I think this is Posix, and that in some cases we 257ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown // should be returning 127, meaning NOTFOUND. Oh well. 258ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown VG_(exit)(126); 259ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 260ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return ret; 261ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 262ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 263ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 264ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// This emulates the kernel's exec(). If it fails, it then emulates the 265ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// shell's handling of the situation. 266ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// See ume.h for an indication of which entries of 'info' are inputs, which 267ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown// are outputs, and which are both. 268ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* returns: 0 = success, non-0 is failure */ 269ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff BrownInt VG_(do_exec)(const HChar* exe_name, ExeInfo* info) 270ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 271ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Int ret; 272ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 273ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown info->interp_name = NULL; 274ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown info->interp_args = NULL; 275ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 276ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ret = VG_(do_exec_inner)(exe_name, info); 277ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 278ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (0 != ret) { 279ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Char* exe_name_casted = (Char*)exe_name; 280ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ret = do_exec_shell_followup(ret, exe_name_casted, info); 281ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 282ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return ret; 283ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 284ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 285ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 286ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--- end ---*/ 287ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/*--------------------------------------------------------------------*/ 288