52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
/*
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* Decoder of seccomp filter programs.
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*
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* Copyright (c) 2015-2018 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "defs.h"
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#include "bpf_filter.h"
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#include <linux/filter.h>
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#ifdef HAVE_LINUX_SECCOMP_H
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# include <linux/seccomp.h>
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#endif
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#ifndef SECCOMP_RET_ACTION_FULL
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# define SECCOMP_RET_ACTION_FULL 0xffff0000U
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#endif
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#include "xlat/seccomp_ret_action.h"
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static bool
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print_seccomp_filter_k(const struct bpf_filter_block *const fp)
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{
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if (BPF_CLASS(fp->code) == BPF_RET) {
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unsigned int action = SECCOMP_RET_ACTION_FULL & fp->k;
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unsigned int data = fp->k & ~action;
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printxval(seccomp_ret_action, action, "SECCOMP_RET_???");
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if (data)
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tprintf("|%#x", data);
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return true;
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}
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return false;
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}
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void
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print_seccomp_fprog(struct tcb *const tcp, const kernel_ulong_t addr,
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const unsigned short len)
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{
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print_bpf_fprog(tcp, addr, len, print_seccomp_filter_k);
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}
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void
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decode_seccomp_fprog(struct tcb *const tcp, const kernel_ulong_t addr)
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{
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decode_bpf_fprog(tcp, addr, print_seccomp_filter_k);
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}
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