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bpf_seccomp_filter.c
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bpf_seccomp_filter.c
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/*
* Decoder of seccomp filter programs.
*
* Copyright (c) 2015-2018 Dmitry V. Levin <[email protected]>
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#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);
}