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linux: Add {f}stat{at} y2038 support

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A new struct __stat{64}_t64 type is added with the required
__timespec64 time definition.  Only LFS is added, 64-bit time with
32-bit offsets is not supposed to be supported (no existing glibc
configuration supports such a combination).  It is done with an extra
__NR_statx call plus a conversion to the new __stat{64}_t64 type.
The statx call is done only for 32-bit time_t ABIs.

Internally some extra routines to copy from/to struct stat{64}
to struct __stat{64} used on multiple implementations (stat, fstat,
lstat, and fstatat) are added on a extra implementation
(stat_t64_cp.c).  Alse some extra routines to copy from statx to
__stat{64} is added on statx_cp.c.

Checked with a build for all affected ABIs. I also checked on x86_64,
i686, powerpc, powerpc64le, sparcv9, sparc64, s390, and s390x.

Reviewed-by: Lukasz Majewski <lukma@denx.de>
This commit is contained in:
Adhemerval Zanella
2020-07-20 16:02:04 -03:00
parent 20b39d5946
commit aa03f722f3
14 changed files with 354 additions and 47 deletions
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56
sysdeps/unix/sysv/linux/stat_t64_cp.c Normal file
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/* Struct stat/stat64 to stat/stat64 conversion for Linux.
Copyright (C) 2020 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 <stat_t64_cp.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#if __TIMESIZE != 64
int
__cp_stat64_t64_stat64 (const struct __stat64_t64 *st64_t64,
struct stat64 *st64)
{
if (! in_time_t_range (st64_t64->st_atim.tv_sec)
|| ! in_time_t_range (st64_t64->st_mtim.tv_sec)
|| ! in_time_t_range (st64_t64->st_ctim.tv_sec))
{
__set_errno (EOVERFLOW);
return -1;
}
/* Clear both pad and reserved fields. */
memset (st64, 0, sizeof (*st64));
st64->st_dev = st64_t64->st_dev,
st64->st_ino = st64_t64->st_ino;
st64->st_mode = st64_t64->st_mode;
st64->st_nlink = st64_t64->st_nlink;
st64->st_uid = st64_t64->st_uid;
st64->st_gid = st64_t64->st_gid;
st64->st_rdev = st64_t64->st_rdev;
st64->st_size = st64_t64->st_size;
st64->st_blksize = st64_t64->st_blksize;
st64->st_blocks = st64_t64->st_blocks;
st64->st_atim = valid_timespec64_to_timespec (st64_t64->st_atim);
st64->st_mtim = valid_timespec64_to_timespec (st64_t64->st_mtim);
st64->st_ctim = valid_timespec64_to_timespec (st64_t64->st_ctim);
return 0;
}
#endif