projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| a63c7fa1 | 1 | /* Overflow tests for stat, statfs, and lseek functions. |
| 568035b7 | 2 | Copyright (C) 2011-2013 Free Software Foundation, Inc. |
| a63c7fa1 CM |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| a63c7fa1 CM |
19 | |
| 20 | #include <sys/stat.h> | |
| 21 | #include <sys/statfs.h> | |
| 22 | ||
| 23 | /* Test for overflows of structures where we ask the kernel to fill them | |
| 24 | in with standard 64-bit syscalls but return them through APIs that | |
| 25 | only expose the low 32 bits of some fields. */ | |
| 26 | ||
| 27 | static inline off_t lseek_overflow (loff_t res) | |
| 28 | { | |
| 29 | off_t retval = (off_t) res; | |
| 30 | if (retval == res) | |
| 31 | return retval; | |
| 32 | ||
| 33 | __set_errno (EOVERFLOW); | |
| 34 | return (off_t) -1; | |
| 35 | } | |
| 36 | ||
| 37 | static inline int stat_overflow (struct stat *buf) | |
| 38 | { | |
| 39 | if (buf->__st_ino_pad == 0 && buf->__st_size_pad == 0 && | |
| 40 | buf->__st_blocks_pad == 0) | |
| 41 | return 0; | |
| 42 | ||
| 43 | __set_errno (EOVERFLOW); | |
| 44 | return -1; | |
| 45 | } | |
| 46 | ||
| 47 | /* Note that f_files and f_ffree may validly be a sign-extended -1. */ | |
| 48 | static inline int statfs_overflow (struct statfs *buf) | |
| 49 | { | |
| 50 | if (buf->__f_blocks_pad == 0 && buf->__f_bfree_pad == 0 && | |
| 51 | buf->__f_bavail_pad == 0 && | |
| 52 | (buf->__f_files_pad == 0 || | |
| 53 | (buf->f_files == -1U && buf->__f_files_pad == -1)) && | |
| 54 | (buf->__f_ffree_pad == 0 || | |
| 55 | (buf->f_ffree == -1U && buf->__f_ffree_pad == -1))) | |
| 56 | return 0; | |
| 57 | ||
| 58 | __set_errno (EOVERFLOW); | |
| 59 | return -1; | |
| 60 | } |