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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Overflow tests for stat, statfs, and lseek functions.
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Copyright (C) 2020-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/stat.h>
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#include <sys/statfs.h>
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/* Test for overflows of structures where we ask the kernel to fill them
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in with standard 64-bit syscalls but return them through APIs that
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only expose the low 32 bits of some fields. */
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static inline off_t lseek_overflow (loff_t res)
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{
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off_t retval = (off_t) res;
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if (retval == res)
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return retval;
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__set_errno (EOVERFLOW);
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return (off_t) -1;
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}
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static inline int stat_overflow (struct stat *buf)
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{
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#if defined __INO_T_MATCHES_INO64_T || !STAT_IS_KERNEL_STAT
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return 0;
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#else
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if (buf->__st_ino_pad == 0 && buf->__st_size_pad == 0
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&& buf->__st_blocks_pad == 0)
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return 0;
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__set_errno (EOVERFLOW);
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return -1;
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#endif
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}
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/* Note that f_files and f_ffree may validly be a sign-extended -1. */
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static inline int statfs_overflow (struct statfs *buf)
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{
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#if __STATFS_MATCHES_STATFS64 || !STAT_IS_KERNEL_STAT
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return 0;
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#else
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if (buf->__f_blocks_pad == 0 && buf->__f_bfree_pad == 0
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&& buf->__f_bavail_pad == 0
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&& (buf->__f_files_pad == 0
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|| (buf->f_files == -1U && buf->__f_files_pad == -1))
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&& (buf->__f_ffree_pad == 0
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|| (buf->f_ffree == -1U && buf->__f_ffree_pad == -1)))
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return 0;
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__set_errno (EOVERFLOW);
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return -1;
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#endif
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}
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