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/**
* Enhanced Seccomp ARM Specific Code
*
* Copyright (c) 2013 Red Hat <pmoore@redhat.com>
* Author: Paul Moore <paul@paul-moore.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 <stdlib.h>
#include <errno.h>
#include <linux/audit.h>
#include "arch.h"
#include "arch-arm.h"
#include "syscalls.h"
#define __SCMP_NR_OABI_SYSCALL_BASE 0x900000
#define __SCMP_ARM_NR_BASE 0x0f0000
/* NOTE: we currently only support the ARM EABI, more info at the URL below:
* -> http://wiki.embeddedarm.com/wiki/EABI_vs_OABI */
#if 1
#define __SCMP_NR_BASE 0
#else
#define __SCMP_NR_BASE __SCMP_NR_OABI_SYSCALL_BASE
#endif
/**
* Resolve a syscall name to a number
* @param arch the architecture definition
* @param name the syscall name
*
* Resolve the given syscall name to the syscall number using the syscall table.
* Returns the syscall number on success, including negative pseudo syscall
* numbers; returns __NR_SCMP_ERROR on failure.
*
*/
int arm_syscall_resolve_name_munge(const struct arch_def *arch,
const char *name)
{
int sys;
/* NOTE: we don't want to modify the pseudo-syscall numbers */
sys = arch->syscall_resolve_name_raw(name);
if (sys == __NR_SCMP_ERROR || sys < 0)
return sys;
return (sys | __SCMP_NR_BASE);
}
/**
* Resolve a syscall number to a name
* @param arch the architecture definition
* @param num the syscall number
*
* Resolve the given syscall number to the syscall name using the syscall table.
* Returns a pointer to the syscall name string on success, including pseudo
* syscall names; returns NULL on failure.
*
*/
const char *arm_syscall_resolve_num_munge(const struct arch_def *arch, int num)
{
/* NOTE: we don't want to modify the pseudo-syscall numbers */
if (num >= 0)
num &= ~__SCMP_NR_BASE;
return arch->syscall_resolve_num_raw(num);
}
ARCH_DEF(arm)
const struct arch_def arch_def_arm = {
.token = SCMP_ARCH_ARM,
.token_bpf = AUDIT_ARCH_ARM,
.size = ARCH_SIZE_32,
.endian = ARCH_ENDIAN_LITTLE,
.syscall_resolve_name = arm_syscall_resolve_name_munge,
.syscall_resolve_name_raw = arm_syscall_resolve_name,
.syscall_resolve_num = arm_syscall_resolve_num_munge,
.syscall_resolve_num_raw = arm_syscall_resolve_num,
.syscall_rewrite = NULL,
.rule_add = NULL,
};
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