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