preload.c

  1 /*
  2  * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU Lesser General Public License version 2.1
  6  * as published by the Free Software Foundation
  7  *
  8  * This program is distributed in the hope that it will be useful,
  9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 11  * GNU General Public License for more details.
 12  */
 13 
 14 #define _GNU_SOURCE
 15 #include <sys/ptrace.h>
 16 #include <sys/types.h>
 17 #include <signal.h>
 18 #include <stdio.h>
 19 #include <stdlib.h>
 20 #include <unistd.h>
 21 #include <string.h>
 22 #include <dlfcn.h>
 23 
 24 #include "../preload.h"
 25 
 26 #define ERROR(fmt, ...) do { \
 27         fprintf(stderr,"perload-jail: "fmt, ## __VA_ARGS__); \
 28         } while (0)
 29 
 30 static main_t __main__;
 31 
 32 static int __preload_main__(int argc, char **argv, char **envp)
 33 {
 34         unsetenv("LD_PRELOAD");
 35         kill(getpid(), SIGSTOP);
 36 
 37         return (*__main__)(argc, argv, envp);
 38 }
 39 
 40 int __libc_start_main(main_t main,
 41                         int argc,
 42                         char **argv,
 43                         ElfW(auxv_t) *auxvec,
 44                         __typeof (main) init,
 45                         void (*fini) (void),
 46                         void (*rtld_fini) (void),
 47                         void *stack_end)
 48 {
 49         start_main_t __start_main__;
 50 
 51         __start_main__ = dlsym(RTLD_NEXT, "__libc_start_main");
 52         if (!__start_main__) {
 53                 ERROR("failed to find __libc_start_main %s\n", dlerror());
 54                 return -1;
 55         }
 56         __main__ = main;
 57 
 58         return (*__start_main__)(__preload_main__, argc, argv, auxvec,
 59                 init, fini, rtld_fini, stack_end);
 60 }
 61 
 62 void __uClibc_main(main_t main,
 63                         int argc,
 64                         char **argv,
 65                         void (*app_init)(void),
 66                         void (*app_fini)(void),
 67                         void (*rtld_fini)(void),
 68                         void *stack_end attribute_unused)
 69 {
 70         uClibc_main __start_main__;
 71 
 72         __start_main__ = dlsym(RTLD_NEXT, "__uClibc_main");
 73         if (!__start_main__) {
 74                 ERROR("failed to find __uClibc_main %s\n", dlerror());
 75                 return;
 76         }
 77 
 78         __main__ = main;
 79 
 80         return (*__start_main__)(__preload_main__, argc, argv,
 81                 app_init, app_fini, rtld_fini, stack_end);
 82 }
 83
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Sources/procd/trace/preload.c
