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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/unix/sysv/linux/generic/wordsize-32/overflow.h
1 /* Overflow tests for stat, statfs, and lseek functions.
2 Copyright (C) 2011-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
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.
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.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library. If not, see
18 <https://www.gnu.org/licenses/>. */
21 #include <sys/statfs.h>
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. */
27 static inline off_t
lseek_overflow (loff_t res
)
29 off_t retval
= (off_t
) res
;
33 __set_errno (EOVERFLOW
);
37 static inline int stat_overflow (struct stat
*buf
)
39 #if defined __INO_T_MATCHES_INO64_T
42 if (buf
->__st_ino_pad
== 0 && buf
->__st_size_pad
== 0
43 && buf
->__st_blocks_pad
== 0)
46 __set_errno (EOVERFLOW
);
51 /* Note that f_files and f_ffree may validly be a sign-extended -1. */
52 static inline int statfs_overflow (struct statfs
*buf
)
54 #if __STATFS_MATCHES_STATFS64
57 if (buf
->__f_blocks_pad
== 0 && buf
->__f_bfree_pad
== 0
58 && buf
->__f_bavail_pad
== 0
59 && (buf
->__f_files_pad
== 0
60 || (buf
->f_files
== -1U && buf
->__f_files_pad
== -1))
61 && (buf
->__f_ffree_pad
== 0
62 || (buf
->f_ffree
== -1U && buf
->__f_ffree_pad
== -1)))
65 __set_errno (EOVERFLOW
);