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/**
* Enhanced Seccomp Architecture/Machine Specific Code
*
* Copyright (c) 2012 Red Hat <pmoore@redhat.com>
* Author: Paul Moore <pmoore@redhat.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>.
*/
#ifndef _ARCH_H
#define _ARCH_H
#include <inttypes.h>
#include <stddef.h>
#include <seccomp.h>
#include "system.h"
struct db_api_arg;
struct arch_def {
uint32_t token;
uint32_t token_bpf;
enum {
ARCH_SIZE_UNSPEC = 0,
ARCH_SIZE_32 = 32,
ARCH_SIZE_64 = 64,
} size;
enum {
ARCH_ENDIAN_UNSPEC = 0,
ARCH_ENDIAN_LITTLE,
ARCH_ENDIAN_BIG,
} endian;
};
/* arch_def for the current architecture */
extern const struct arch_def *arch_def_native;
/* NOTE: Syscall mappings can be found by running the following commands
* on the specific architecture's include file:
* # gcc -E -dM <file> | grep '__NR_'
* where <file> in many cases is /usr/include/asm/unistd.h, however,
* depending on the architecture you may need to use a different header.
* Further, you can automatically format this list for use as a struct
* initializer with the following command:
* # gcc -E -dM <file> | grep '__NR_' | \
* sed -e 's/#define[ \t]\+__NR_//' | sort | \
* sed -e 's/\([^ \t]\+\)\([ \t]\+\)\([0-9]\+\)/\t{ \"\1\", \3 },/'
* Finally, when creating a table/array of this structure, the final
* sentinel entry should be "{ NULL, __NR_SCMP_ERROR }"; see the existing
* tables as an example.
*/
struct arch_syscall_def {
const char *name;
unsigned int num;
};
#define DATUM_MAX ((scmp_datum_t)-1)
#define D64_LO(x) ((uint32_t)((uint64_t)(x) & 0x00000000ffffffff))
#define D64_HI(x) ((uint32_t)((uint64_t)(x) >> 32))
#define ARG_COUNT_MAX 6
int arch_valid(uint32_t arch);
const struct arch_def *arch_def_lookup(uint32_t token);
int arch_arg_count_max(const struct arch_def *arch);
/**
* Determine the argument offset
* @param _arg the argument number
*
* Return the correct offset of the given argument.
*
*/
#define arch_arg_offset(_arg) (offsetof(struct seccomp_data, args[_arg]))
int arch_arg_offset_lo(const struct arch_def *arch, unsigned int arg);
int arch_arg_offset_hi(const struct arch_def *arch, unsigned int arg);
int arch_syscall_resolve_name(const struct arch_def *arch, const char *name);
const char *arch_syscall_resolve_num(const struct arch_def *arch, int num);
int arch_syscall_translate(const struct arch_def *arch, int *syscall);
int arch_syscall_rewrite(const struct arch_def *arch, unsigned int strict,
int *syscall);
int arch_filter_rewrite(const struct arch_def *arch,
unsigned int strict,
int *syscall, struct db_api_arg *chain);
#endif
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