1 /* Support functions handling ptrace_scope. 2 Copyright (C) 2019-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #include <support/check.h> 20 #include <support/xstdio.h> 21 #include <support/xptrace.h> 22 23 int support_ptrace_scope(void)24support_ptrace_scope (void) 25 { 26 int ptrace_scope = -1; 27 28 #ifdef __linux__ 29 /* YAMA may be not enabled. Otherwise it contains a value from 0 to 3: 30 - 0 classic ptrace permissions 31 - 1 restricted ptrace 32 - 2 admin-only attach 33 - 3 no attach */ 34 FILE *f = fopen ("/proc/sys/kernel/yama/ptrace_scope", "r"); 35 if (f != NULL) 36 { 37 TEST_COMPARE (fscanf (f, "%d", &ptrace_scope), 1); 38 xfclose (f); 39 } 40 #endif 41 42 return ptrace_scope; 43 } 44