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
|
/*
* libpulp - User-space Livepatching Library
*
* Copyright (C) 2020-2021 SUSE Software Solutions GmbH
*
* This file is part of libpulp.
*
* libpulp is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* libpulp 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with libpulp. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/mman.h>
#include <stdlib.h>
/* This function is here for messing with seccomp. Seccomp disables
mmap with EXEC | WRITE attributes, so if we call it we should get
a memory allocation error with ENOPERM. */
__attribute__((constructor))
static void initialize(void)
{
void *page = mmap(NULL, 128, PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
/* Check if we got the page. */
if (page == (void *) -1L || page == NULL) {
/* We did not get the page, abort. */
abort();
}
/* Clean memory. */
munmap(page, 128);
}
int
baker_dozen(void)
{
return 13;
}
|
