1 /* 2 * Force legacy printpath/umovestr using PR_SET_DUMPABLE. 3 * 4 * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "tests.h" 31 32 #ifdef HAVE_PRCTL 33 # include <sys/prctl.h> 34 #endif 35 36 #if defined HAVE_PRCTL && defined PR_SET_DUMPABLE 37 38 # include <stdio.h> 39 # include <unistd.h> 40 41 # include "test_ucopy.h" 42 43 int 44 main(void) 45 { 46 if (!test_process_vm_readv()) 47 perror_msg_and_skip("process_vm_readv"); 48 49 /* 50 * Clearing dumpable flag disallows process_vm_readv. 51 * If the kernel does not contain commit 52 * 84d77d3f06e7e8dea057d10e8ec77ad71f721be3, then 53 * PTRACE_PEEKDATA remains allowed. 54 */ 55 if (prctl(PR_SET_DUMPABLE, 0)) 56 perror_msg_and_skip("PR_SET_DUMPABLE 0"); 57 58 if (!test_ptrace_peekdata()) 59 perror_msg_and_skip("PTRACE_PEEKDATA"); 60 61 test_printpath(sizeof(long) * 4); 62 63 puts("+++ exited with 0 +++"); 64 return 0; 65 } 66 67 #else 68 69 SKIP_MAIN_UNDEFINED("HAVE_PRCTL && PR_SET_DUMPABLE") 70 71 #endif 72