| /* ********************************************************** |
| * Copyright (c) 2012 Google, Inc. All rights reserved. |
| * **********************************************************/ |
| |
| /* |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * * Neither the name of Google, Inc. nor the names of its contributors may be |
| * used to endorse or promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE, INC. OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| */ |
| |
| /* Helper exe that execs an exe with fake argv[0]. There isn't a way to do |
| * this from bash, so we need this helper. |
| * |
| * We use it for DR early injection by invoking it like so: |
| * drloader path/to/libdynamorio.so /path/to/app <args...> |
| * |
| * This way, the kernel puts the original path to the app on the stack as |
| * argv[0], and we don't have to shuffle the strings around to fix up |
| * /proc/pid/cmdline. |
| * |
| * XXX i#840: Eventually this should be folded into a drinject and drdeploy C |
| * implementation for Linux. |
| */ |
| |
| #include "configure.h" /* for UNIX */ |
| #include "globals_shared.h" /* for DYNAMORIO_VAR_EXE_PATH */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/stat.h> |
| |
| int |
| main(int argc, char **argv) |
| { |
| int r; |
| struct stat st; |
| char *libdr_so; |
| char *app; |
| |
| if (argc < 3) { |
| fprintf(stderr, "Usage: %s <libdynamorio.so> <app path> [argv...]\n", argv[0]); |
| return -1; |
| } |
| |
| /* Check if DR and the app exist. It's easier to give a good error message |
| * if we do this up front, rather than waiting for DR or execve to fail. |
| */ |
| libdr_so = argv[1]; |
| r = stat(libdr_so, &st); |
| if (r < 0) { |
| fprintf(stderr, "%s: can't stat %s\n", argv[0], libdr_so); |
| perror(argv[0]); |
| return -1; |
| } |
| |
| /* Check if the app exists. */ |
| app = argv[2]; |
| r = stat(app, &st); |
| if (r < 0) { |
| fprintf(stderr, "%s: can't stat %s\n", argv[0], app); |
| perror(argv[0]); |
| return -1; |
| } |
| |
| /* The execve syscall prototype is: |
| * int execve(char *filename, char *argv[], char *envp[]); |
| * We pass libdr_so as the filename. For argv, we pass the rest of the |
| * command line starting with the app's path. |
| */ |
| setenv(DYNAMORIO_VAR_EXE_PATH, app, true /*overwrite*/); |
| r = execv(libdr_so, &argv[2]); |
| /* Only returns on error. */ |
| fprintf(stderr, "%s: can't exec %s\n", argv[0], app); |
| perror(argv[0]); |
| return r; |
| } |