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a63c7fa1 | 1 | /* Overflow tests for stat, statfs, and lseek functions. |
b168057a | 2 | Copyright (C) 2011-2015 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 | } |