/** * Enhanced Seccomp ARM Specific Code * * Copyright (c) 2013 Red Hat * Author: Paul Moore */ /* * 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 . */ #include #include #include #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, };