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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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20
sysdeps/unix/sysv/linux/fstat64.c
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@ -19,16 +19,30 @@
#define __fstat __redirect___fstat
#define fstat __redirect_fstat
#include <sys/stat.h>
#undef __fstat
#undef fstat
#include <fcntl.h>
#include <kernel_stat.h>
#include <stat_t64_cp.h>
int
__fstat64_time64 (int fd, struct __stat64_t64 *buf)
{
return __fstatat64_time64 (fd, "", buf, AT_EMPTY_PATH);
}
#if __TIMESIZE != 64
hidden_def (__fstat64_time64)
int
__fstat64 (int fd, struct stat64 *buf)
{
return __fstatat64 (fd, "", buf, AT_EMPTY_PATH);
struct __stat64_t64 st_t64;
return __fstat64_time64 (fd, &st_t64)
?: __cp_stat64_t64_stat64 (&st_t64, buf);
}
#endif
#undef __fstat
#undef fstat
hidden_def (__fstat64)
weak_alias (__fstat64, fstat64)