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/* Support functions handling ptrace_scope.
Copyright (C) 2019-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/check.h>
#include <support/xstdio.h>
#include <support/xptrace.h>
int
support_ptrace_scope (void)
{
int ptrace_scope = -1;
#ifdef __linux__
/* YAMA may be not enabled. Otherwise it contains a value from 0 to 3:
- 0 classic ptrace permissions
- 1 restricted ptrace
- 2 admin-only attach
- 3 no attach */
FILE *f = fopen ("/proc/sys/kernel/yama/ptrace_scope", "r");
if (f != NULL)
{
TEST_COMPARE (fscanf (f, "%d", &ptrace_scope), 1);
xfclose (f);
}
#endif
return ptrace_scope;
}
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