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

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>

1 files changed, 17 insertions, 3 deletions

diff --git a/sysdeps/unix/sysv/linux/stat64.c b/sysdeps/unix/sysv/linux/stat64.c
index 2f40037c2c..bd8b17ac49 100644
--- a/sysdeps/unix/sysv/linux/stat64.c
+++ b/sysdeps/unix/sysv/linux/stat64.c
@@ -19,16 +19,30 @@
 #define __stat __redirect___stat
 #define stat   __redirect_stat
 #include <sys/stat.h>
-#undef __stat
-#undef stat
 #include <fcntl.h>
 #include <kernel_stat.h>
+#include <stat_t64_cp.h>
+
+int
+__stat64_time64 (const char *file, struct __stat64_t64 *buf)
+{
+  return __fstatat64_time64 (AT_FDCWD, file, buf, 0);
+}
+#if __TIMESIZE != 64
+hidden_def (__stat64_time64)
 
 int
 __stat64 (const char *file, struct stat64 *buf)
 {
-  return __fstatat64 (AT_FDCWD, file, buf, 0);
+  struct __stat64_t64 st_t64;
+  return __stat64_time64 (file, &st_t64)
+	 ?: __cp_stat64_t64_stat64 (&st_t64, buf);
 }
+#endif
+
+#undef __stat
+#undef stat
+
 hidden_def (__stat64)
 weak_alias (__stat64, stat64)