/*
|
* Decoder of seccomp filter programs.
|
*
|
* Copyright (c) 2015-2017 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 "defs.h"
|
|
#include "bpf_filter.h"
|
|
#include <linux/filter.h>
|
#ifdef HAVE_LINUX_SECCOMP_H
|
# include <linux/seccomp.h>
|
#endif
|
#ifndef SECCOMP_RET_ACTION_FULL
|
# define SECCOMP_RET_ACTION_FULL 0xffff0000U
|
#endif
|
#include "xlat/seccomp_ret_action.h"
|
|
static bool
|
print_seccomp_filter_k(const struct bpf_filter_block *const fp)
|
{
|
if (BPF_CLASS(fp->code) == BPF_RET) {
|
unsigned int action = SECCOMP_RET_ACTION_FULL & fp->k;
|
unsigned int data = fp->k & ~action;
|
|
printxval(seccomp_ret_action, action, "SECCOMP_RET_???");
|
if (data)
|
tprintf("|%#x", data);
|
|
return true;
|
}
|
|
return false;
|
}
|
|
void
|
print_seccomp_fprog(struct tcb *const tcp, const kernel_ulong_t addr,
|
const unsigned short len)
|
{
|
print_bpf_fprog(tcp, addr, len, print_seccomp_filter_k);
|
}
|
|
void
|
decode_seccomp_fprog(struct tcb *const tcp, const kernel_ulong_t addr)
|
{
|
decode_bpf_fprog(tcp, addr, print_seccomp_filter_k);
|
}
|
