1// Copyright (c) 2022, Google Inc. 2// 3// Permission to use, copy, modify, and/or distribute this software for any 4// purpose with or without fee is hereby granted, provided that the above 5// copyright notice and this permission notice appear in all copies. 6// 7// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 10// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 14 15//go:build ignore 16 17// check_stack.go checks that each of its arguments has a non-executable stack. 18// See https://www.airs.com/blog/archives/518 for details. 19package main 20 21import ( 22 "debug/elf" 23 "fmt" 24 "os" 25) 26 27func checkStack(path string) { 28 file, err := elf.Open(path) 29 if err != nil { 30 fmt.Fprintf(os.Stderr, "Error opening %s: %s\n", path, err) 31 os.Exit(1) 32 } 33 defer file.Close() 34 35 for _, prog := range file.Progs { 36 if prog.Type == elf.PT_GNU_STACK && prog.Flags&elf.PF_X != 0 { 37 fmt.Fprintf(os.Stderr, "%s has an executable stack.\n", path) 38 os.Exit(1) 39 } 40 } 41} 42 43func main() { 44 for _, path := range os.Args[1:] { 45 checkStack(path) 46 } 47} 48