1 /* Overflow tests for stat, statfs, and lseek functions.
2 Copyright (C) 2020-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
20 #include <sys/statfs.h>
22 /* Test for overflows of structures where we ask the kernel to fill them
23 in with standard 64-bit syscalls but return them through APIs that
24 only expose the low 32 bits of some fields. */
26 static inline off_t
lseek_overflow (loff_t res
)
28 off_t retval
= (off_t
) res
;
32 __set_errno (EOVERFLOW
);
36 static inline int stat_overflow (struct stat
*buf
)
38 #if defined __INO_T_MATCHES_INO64_T || !STAT_IS_KERNEL_STAT
41 if (buf
->__st_ino_pad
== 0 && buf
->__st_size_pad
== 0
42 && buf
->__st_blocks_pad
== 0)
45 __set_errno (EOVERFLOW
);
50 /* Note that f_files and f_ffree may validly be a sign-extended -1. */
51 static inline int statfs_overflow (struct statfs
*buf
)
53 #if __STATFS_MATCHES_STATFS64 || !STAT_IS_KERNEL_STAT
56 if (buf
->__f_blocks_pad
== 0 && buf
->__f_bfree_pad
== 0
57 && buf
->__f_bavail_pad
== 0
58 && (buf
->__f_files_pad
== 0
59 || (buf
->f_files
== -1U && buf
->__f_files_pad
== -1))
60 && (buf
->__f_ffree_pad
== 0
61 || (buf
->f_ffree
== -1U && buf
->__f_ffree_pad
== -1)))
64 __set_errno (EOVERFLOW
);