68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
|
/* Overflow tests for stat, statfs, and lseek functions.
|
||
|
|
Copyright (C) 2020-2022 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
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
|
||
|
|
<https://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 defined __INO_T_MATCHES_INO64_T || !STAT_IS_KERNEL_STAT
|
||
|
|
return 0;
|
||
|
|
#else
|
||
|
|
if (buf->__st_ino_pad == 0 && buf->__st_size_pad == 0
|
||
|
|
&& buf->__st_blocks_pad == 0)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
__set_errno (EOVERFLOW);
|
||
|
|
return -1;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Note that f_files and f_ffree may validly be a sign-extended -1. */
|
||
|
|
static inline int statfs_overflow (struct statfs *buf)
|
||
|
|
{
|
||
|
|
#if __STATFS_MATCHES_STATFS64 || !STAT_IS_KERNEL_STAT
|
||
|
|
return 0;
|
||
|
|
#else
|
||
|
|
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;
|
||
|
|
#endif
|
||
|
|
}
|