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/*
* Copyright (c) 2017 William Pitcock <nenolod@dereferenced.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#ifndef PATH_MAX
#define PATH_MAX 16384
#endif
#ifndef LINKER
#error LINKER must be defined
#endif
#ifndef LIBGCOMPAT
#error LIBGCOMPAT must be defined
#endif
int main(int argc, char *argv[], char *envp[]) {
size_t i = 0;
char target[PATH_MAX];
char **new_argv = calloc(sizeof(char *), argc + 5);
memset(target, 0, sizeof(target));
if (readlink("/proc/self/exe", target, sizeof(target)) < 0) {
perror("readlink");
return EXIT_FAILURE;
}
new_argv[0] = argv[0];
new_argv[1] = "--preload";
new_argv[2] = LIBGCOMPAT;
new_argv[3] = target;
for (i = 1; i < argc; i++) {
new_argv[3 + i] = argv[i];
}
execve(LINKER, new_argv, envp);
/* execve only returns if there is an error. */
perror("execve");
return EXIT_FAILURE;
}
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