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