From 59ff172f8064757e2302f9b4fb7583ec2841d591 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Thu, 8 Jan 2015 10:49:40 -0800 Subject: NPTL: Refactor cpu_set_t validation to be sysdeps-controlled This removes Linuxisms related to cpu_set_t validation from the generic NPTL code and puts them into a new sysdeps header file. --- sysdeps/unix/sysv/linux/check-cpuset.h | 48 ++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/check-cpuset.h (limited to 'sysdeps/unix') diff --git a/sysdeps/unix/sysv/linux/check-cpuset.h b/sysdeps/unix/sysv/linux/check-cpuset.h new file mode 100644 index 0000000000..1d55e0bb0e --- /dev/null +++ b/sysdeps/unix/sysv/linux/check-cpuset.h @@ -0,0 +1,48 @@ +/* Validate cpu_set_t values for NPTL. Linux version. + Copyright (C) 2002-2015 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 + . */ + +#include +#include + + +/* Defined in pthread_setaffinity.c. */ +extern size_t __kernel_cpumask_size attribute_hidden; +extern int __determine_cpumask_size (pid_t tid); + +/* Returns 0 if CS and SZ are valid values for the cpuset and cpuset size + respectively. Otherwise it returns an error number. */ +static inline int +check_cpuset_attr (const cpu_set_t *cs, const size_t sz) +{ + if (__kernel_cpumask_size == 0) + { + int res = __determine_cpumask_size (THREAD_SELF->tid); + if (res) + return res; + } + + /* Check whether the new bitmask has any bit set beyond the + last one the kernel accepts. */ + for (size_t cnt = __kernel_cpumask_size; cnt < sz; ++cnt) + if (((char *) cs)[cnt] != '\0') + /* Found a nonzero byte. This means the user request cannot be + fulfilled. */ + return EINVAL; + + return 0; +} -- cgit 1.4.1