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
81
82
83
84
85
86
87
88
89
|
/**
* Seccomp Library test program
*
* Copyright (c) 2012 Red Hat <pmoore@redhat.com>
* Copyright (c) 2021 Microsoft Corporation <paulmoore@microsoft.com>
* Author: Paul Moore <paul@paul-moore.com>
*/
/*
* This library is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License as
* published by the Free Software Foundation.
*
* This library 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 Lesser General Public License
* along with this library; if not, see <http://www.gnu.org/licenses>.
*/
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <stdlib.h>
#include <seccomp.h>
#include "util.h"
int main(int argc, char *argv[])
{
int rc;
int iter, ctr;
char *syscall;
struct util_options opts;
scmp_filter_ctx ctx = NULL;
rc = util_getopt(argc, argv, &opts);
if (rc < 0)
goto out;
ctx = seccomp_init(SCMP_ACT_KILL);
if (ctx == NULL)
return ENOMEM;
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(brk), 0);
if (rc != 0)
goto out;
/* same syscall, many chains */
for (iter = 0; iter < 100; iter++) {
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(chdir), 3,
SCMP_A0(SCMP_CMP_EQ, iter),
SCMP_A1(SCMP_CMP_NE, 0x0),
SCMP_A2(SCMP_CMP_LT, SSIZE_MAX));
if (rc != 0)
goto out;
}
/* many syscalls, same chain */
for (iter = 0, ctr = 0; iter < 10000 && ctr < 100; iter++) {
if (iter == SCMP_SYS(chdir))
continue;
syscall = seccomp_syscall_resolve_num_arch(SCMP_ARCH_NATIVE,
iter);
if (syscall) {
free(syscall);
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, iter, 1,
SCMP_A0(SCMP_CMP_NE, 0));
if (rc != 0)
goto out;
ctr++;
}
}
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(close), 0);
if (rc != 0)
goto out;
rc = util_filter_output(&opts, ctx);
if (rc)
goto out;
out:
seccomp_release(ctx);
return (rc < 0 ? -rc : rc);
}
|
