strace/tests/seccomp_get_action_avail.c

/*
 * Check decoding of seccomp SECCOMP_GET_ACTION_AVAIL.
 *
 * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "tests.h"
#include <asm/unistd.h>

#ifdef __NR_seccomp

# include <stdio.h>
# include <stdint.h>
# include <unistd.h>

# ifdef HAVE_LINUX_SECCOMP_H
#  include <linux/seccomp.h>
# endif

# ifndef SECCOMP_GET_ACTION_AVAIL
#  define SECCOMP_GET_ACTION_AVAIL 2
# endif

static const char *errstr;

static long
k_seccomp(const kernel_ulong_t op, const kernel_ulong_t flags,
	  const kernel_ulong_t args)
{
	const long rc = syscall(__NR_seccomp, op, flags, args);
	errstr = sprintrc(rc);
	return rc;
}

int
main(void)
{
	TAIL_ALLOC_OBJECT_CONST_PTR(uint32_t, act);
	kernel_ulong_t op = (kernel_ulong_t) 0xfacefeed00000000ULL
				| SECCOMP_GET_ACTION_AVAIL;
	kernel_ulong_t flags = (kernel_ulong_t) 0xdeadbeef00000000ULL;
	unsigned int i;

	struct {
		uint32_t val;
		const char *str;
	} actions [] = {
		{ 0, "SECCOMP_RET_KILL_THREAD" },
# ifdef SECCOMP_RET_KILL_PROCESS
		{ ARG_STR(SECCOMP_RET_KILL_PROCESS) },
# endif
# ifdef SECCOMP_RET_TRAP
		{ ARG_STR(SECCOMP_RET_TRAP) },
# endif
# ifdef SECCOMP_RET_ERRNO
		{ ARG_STR(SECCOMP_RET_ERRNO) },
# endif
# ifdef SECCOMP_RET_TRACE
		{ ARG_STR(SECCOMP_RET_TRACE) },
# endif
# ifdef SECCOMP_RET_LOG
		{ ARG_STR(SECCOMP_RET_LOG) },
# endif
# ifdef SECCOMP_RET_ALLOW
		{ ARG_STR(SECCOMP_RET_ALLOW) },
# endif
		{ 0xffffffff, "0xffffffff /* SECCOMP_RET_??? */" }
	};

	for (i = 0; i < ARRAY_SIZE(actions); ++i) {
		*act = actions[i].val;
		k_seccomp(op, flags, (uintptr_t) act);
		printf("seccomp(SECCOMP_GET_ACTION_AVAIL, 0, [%s]) = %s\n",
		       actions[i].str, errstr);
	}

	*act = actions[0].val;

	k_seccomp(op, flags, (uintptr_t) (act + 1));
	printf("seccomp(SECCOMP_GET_ACTION_AVAIL, 0, %p) = %s\n",
	       act + 1, errstr);

	if (F8ILL_KULONG_SUPPORTED) {
		k_seccomp(op, flags, f8ill_ptr_to_kulong(act));
		printf("seccomp(SECCOMP_GET_ACTION_AVAIL, 0, %#jx) = %s\n",
		       (uintmax_t) f8ill_ptr_to_kulong(act), errstr);
	}

	flags |= 0xcafef00d;
	k_seccomp(op, flags, 0);
	printf("seccomp(SECCOMP_GET_ACTION_AVAIL, %u, NULL) = %s\n",
	       (unsigned int) flags, errstr);

	puts("+++ exited with 0 +++");
	return 0;
}

#else

SKIP_MAIN_UNDEFINED("__NR_seccomp")

#endif