15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#ifndef SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__ 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#define SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <stdint.h> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace playground2 { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Iterates over the entire system call range from 0..0xFFFFFFFFu. This 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// iterator is aware of how system calls look like and will skip quickly 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// over ranges that can't contain system calls. It iterates more slowly 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// whenever it reaches a range that is potentially problematic, returning 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// the last invalid value before a valid range of system calls, and the 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// first invalid value after a valid range of syscalls. It iterates over 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// individual values whenever it is in the normal range for system calls 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// (typically MIN_SYSCALL..MAX_SYSCALL). 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// If |invalid_only| is true, this iterator will only return invalid 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// syscall numbers, but will still skip quickly over invalid ranges, 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// returning the first invalid value in the range and then skipping 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// to the last invalid value in the range. 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Example usage: 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// for (SyscallIterator iter(false); !iter.Done(); ) { 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// uint32_t sysnum = iter.Next(); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// // Do something with sysnum. 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// } 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// TODO(markus): Make this a classic C++ iterator. 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class SyscallIterator { 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) explicit SyscallIterator(bool invalid_only) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : invalid_only_(invalid_only), 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) done_(false), 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) num_(0) {} 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool Done() const { return done_; } 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t Next(); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static bool IsValid(uint32_t num); 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static bool IsArmPrivate(uint32_t num); 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool invalid_only_; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool done_; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32_t num_; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DISALLOW_IMPLICIT_CONSTRUCTORS(SyscallIterator); 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace playground2 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#endif // SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_ITERATOR_H__ 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 57