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/**
* Seccomp Library test program
*
* Copyright (c) 2018-2020 Oracle and/or its affiliates.
* 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 <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <seccomp.h>
#include "util.h"
#define ARG_COUNT_MAX 2
struct syscall_errno {
int syscall;
int error;
int arg_cnt;
/* To make the test more interesting, arguments are added to several
* syscalls. To keep the test simple, the arguments always use
* SCMP_CMP_EQ.
*/
int args[ARG_COUNT_MAX];
};
struct syscall_errno table[] = {
{ SCMP_SYS(read), 0, 2, { 100, 101 } },
{ SCMP_SYS(write), 1, 1, { 102, 0 } },
{ SCMP_SYS(open), 2, 0, { 0, 0 } },
{ SCMP_SYS(close), 3, 0, { 0, 0 } },
{ SCMP_SYS(stat), 4, 0, { 0, 0 } },
{ SCMP_SYS(fstat), 5, 1, { 103, 0 } },
{ SCMP_SYS(lstat), 6, 0, { 0, 0 } },
{ SCMP_SYS(poll), 7, 0, { 0, 0 } },
{ SCMP_SYS(lseek), 8, 1, { 104, 0 } },
{ SCMP_SYS(mmap), 9, 0, { 0, 0 } },
{ SCMP_SYS(mprotect), 10, 1, { 105, 0 } },
{ SCMP_SYS(munmap), 11, 0, { 0, 0 } },
{ SCMP_SYS(brk), 12, 0, { 0, 0 } },
{ SCMP_SYS(rt_sigaction), 13, 0, { 0, 0 } },
{ SCMP_SYS(rt_sigprocmask), 14, 0, { 0, 0 } },
{ SCMP_SYS(rt_sigreturn), 15, 0, { 0, 0 } },
{ SCMP_SYS(ioctl), 16, 0, { 0, 0 } },
{ SCMP_SYS(pread64), 17, 1, { 106, 0 } },
{ SCMP_SYS(pwrite64), 18, 2, { 107, 108 } },
};
const int table_size = sizeof(table) / sizeof(table[0]);
int main(int argc, char *argv[])
{
int rc, fd, i;
scmp_filter_ctx ctx = NULL;
/* stdout */
fd = 1;
ctx = seccomp_init(SCMP_ACT_ALLOW);
if (ctx == NULL) {
rc = ENOMEM;
goto out;
}
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;
rc = seccomp_arch_add(ctx, SCMP_ARCH_AARCH64);
if (rc < 0)
goto out;
rc = seccomp_attr_set(ctx, SCMP_FLTATR_CTL_OPTIMIZE, 2);
if (rc < 0)
goto out;
for (i = 0; i < table_size; i++) {
switch (table[i].arg_cnt) {
case 2:
rc = seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(table[i].error),
table[i].syscall, 2,
SCMP_A0(SCMP_CMP_EQ,
table[i].args[0]),
SCMP_A1(SCMP_CMP_EQ,
table[i].args[1]));
break;
case 1:
rc = seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(table[i].error),
table[i].syscall, 1,
SCMP_A0(SCMP_CMP_EQ,
table[i].args[0]));
break;
case 0:
default:
rc = seccomp_rule_add(ctx,
SCMP_ACT_ERRNO(table[i].error),
table[i].syscall, 0);
break;
}
if (rc < 0)
goto out;
}
rc = seccomp_export_pfc(ctx, fd);
if (rc < 0)
goto out;
out:
seccomp_release(ctx);
close(fd);
return (rc < 0 ? -rc : rc);
}
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