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/**
* Seccomp Library test program
*
* Copyright (c) 2019 Oracle and/or its affiliates. All rights reserved.
* Author: Tom Hromatka <tom.hromatka@oracle.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 <seccomp.h>
#include "util.h"
int main(int argc, char *argv[])
{
int rc;
struct util_options opts;
scmp_filter_ctx ctx = NULL;
rc = util_getopt(argc, argv, &opts);
if (rc < 0)
goto out;
rc = seccomp_api_set(1);
if (rc != 0)
return -rc;
ctx = seccomp_init(SCMP_ACT_ERRNO(100));
if (ctx == NULL)
return ENOMEM;
rc = seccomp_arch_remove(ctx, SCMP_ARCH_NATIVE);
if (rc != 0)
goto out;
rc = seccomp_arch_add(ctx, SCMP_ARCH_X86_64);
if (rc != 0)
goto out;
/* libseccomp utilizes a hash table to manage BPF blocks. It
* currently employs MurmurHash3 where the key is the hashed values
* of the BPF instruction blocks, the accumulator start, and the
* accumulator end. Changes to the hash algorithm will likely affect
* this test.
*/
/* The following rules were derived from an issue reported by Tor:
* https://github.com/seccomp/libseccomp/issues/148
*
* In the steps below, syscall 1001 is configured similarly to how
* Tor configured socket. The fairly complex rules below led to
* a hash collision with rt_sigaction (syscall 1000) in this test.
*/
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, 1001, 3,
SCMP_A0(SCMP_CMP_EQ, 1),
SCMP_A1(SCMP_CMP_MASKED_EQ, 0xf, 2),
SCMP_A2(SCMP_CMP_EQ, 3));
if (rc != 0)
goto out;
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, 1001, 2,
SCMP_A0(SCMP_CMP_EQ, 1),
SCMP_A1(SCMP_CMP_MASKED_EQ, 0xf, 1));
if (rc != 0)
goto out;
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, 1000, 1,
SCMP_A0(SCMP_CMP_EQ, 2));
if (rc != 0)
goto out;
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, 1000, 1,
SCMP_A0(SCMP_CMP_EQ, 1));
if (rc != 0)
goto out;
rc = util_filter_output(&opts, ctx);
if (rc)
goto out;
out:
seccomp_release(ctx);
return (rc < 0 ? -rc : rc);
}
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