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
|
// copy_test_relro.cc -- test copy relocs against read-only and relro symbols.
// Copyright (C) 2016-2022 Free Software Foundation, Inc.
// Written by Cary Coutant <ccoutant@gmail.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// 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.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
#include <cassert>
#include <stdint.h>
#include <signal.h>
#include <setjmp.h>
extern int* const p;
extern const int b[];
extern const int* const q;
extern const int c;
int a = 123;
extern const int* const cp __attribute__ ((section (".rodata"))) = &c;
extern const int* const* const qp __attribute__ ((section (".rodata"))) = &q;
volatile int segfaults = 0;
sigjmp_buf jmp;
void segv(int)
{
++segfaults;
siglongjmp(jmp, 1);
}
int main()
{
assert(*p == 123);
assert(b[0] == 100);
assert(b[1] == 200);
assert(b[2] == 300);
assert(b[3] == 400);
assert(c == 500);
struct sigaction act;
act.sa_handler = segv;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGSEGV, &act, 0);
assert(segfaults == 0);
if (sigsetjmp(jmp, 1) == 0)
*const_cast<const int **>(&p) = &c;
assert(segfaults == 1);
if (sigsetjmp(jmp, 1) == 0)
*const_cast<int *>(b) = 99;
assert(segfaults == 2);
if (sigsetjmp(jmp, 1) == 0)
*const_cast<int *>(cp) = c - 1;
assert(segfaults == 3);
if (sigsetjmp(jmp, 1) == 0)
*const_cast<int **>(qp) = &a;
assert(segfaults == 4);
return 0;
}
|
