| /* Overflow tests for stat, statfs, and lseek functions. |
| Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. |
| |
| 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sys/stat.h> |
| #include <sys/statfs.h> |
| |
| /* Test for overflows of structures where we ask the kernel to fill them |
| in with standard 64-bit syscalls but return them through APIs that |
| only expose the low 32 bits of some fields. */ |
| |
| static inline off_t lseek_overflow (loff_t res) |
| { |
| off_t retval = (off_t) res; |
| if (retval == res) |
| return retval; |
| |
| __set_errno (EOVERFLOW); |
| return (off_t) -1; |
| } |
| |
| static inline int stat_overflow (struct stat *buf) |
| { |
| if (buf->__st_ino_pad == 0 && buf->__st_size_pad == 0 && |
| buf->__st_blocks_pad == 0) |
| return 0; |
| |
| __set_errno (EOVERFLOW); |
| return -1; |
| } |
| |
| /* Note that f_files and f_ffree may validly be a sign-extended -1. */ |
| static inline int statfs_overflow (struct statfs *buf) |
| { |
| if (buf->__f_blocks_pad == 0 && buf->__f_bfree_pad == 0 && |
| buf->__f_bavail_pad == 0 && |
| (buf->__f_files_pad == 0 || |
| (buf->f_files == -1U && buf->__f_files_pad == -1)) && |
| (buf->__f_ffree_pad == 0 || |
| (buf->f_ffree == -1U && buf->__f_ffree_pad == -1))) |
| return 0; |
| |
| __set_errno (EOVERFLOW); |
| return -1; |
| } |
