glibc/sysdeps/unix/sysv/linux/clock_adjtime.c
Lukasz Majewski 63ff4a6d17 y2038: linux: Provide __clock_adjtime64 implementation
This patch replaces auto generated wrapper (as described in
sysdeps/unix/sysv/linux/syscalls.list) for clock_adjtime with one which adds
extra support for reading 64 bit time values on machines with __TIMESIZE != 64.

To achieve this goal new __clock_adjtime64 explicit 64 bit function for
adjusting Linux clock has been added.
Moreover, a 32 bit version - __clock_adjtime has been refactored to internally
use __clock_adjtime64.

The __clock_adjtime is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversions between 64 bit
struct __timespec64 and struct timespec.

The new __clock_adjtime64 syscall available from Linux 5.1+ has been used, when
applicable.
Up till v5.4 in the Linux kernel there was a bug preventing this call from
obtaining correct struct's timex time.tv_sec time after time_t overflow
(i.e. not being Y2038 safe).

Build tests:
- ./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Linux kernel, headers and minimal kernel version for glibc build test matrix:
- Linux v5.1 (with clock_adjtime64) and glibc build with v5.1 as
  minimal kernel version (--enable-kernel="5.1.0")
  The __ASSUME_TIME64_SYSCALLS flag defined.

- Linux v5.1 and default minimal kernel version
  The __ASSUME_TIME64_SYSCALLS not defined, but kernel supports clock_adjtime64
  syscall.

- Linux v4.19 (no clock_adjtime64 support) with default minimal kernel version
  for contemporary glibc (3.2.0)
  This kernel doesn't support clock_adjtime64 syscall, so the fallback to
  clock_adjtime is tested.

Above tests were performed with Y2038 redirection applied as well as without
(so the __TIMESIZE != 64 execution path is checked as well).

No regressions were observed.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2020-05-20 01:03:26 +02:00

74 lines
2.1 KiB
C

/* clock_adjtime -- tune kernel clock.
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; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <sysdep.h>
#include <sys/timex.h>
#include <kernel-features.h>
int
__clock_adjtime64 (const clockid_t clock_id, struct __timex64 *tx64)
{
#ifdef __ASSUME_TIME64_SYSCALLS
# ifndef __NR_clock_adjtime64
# define __NR_clock_adjtime64 __NR_clock_adjtime
# endif
return INLINE_SYSCALL_CALL (clock_adjtime64, clock_id, tx64);
#else
int ret = INLINE_SYSCALL_CALL (clock_adjtime64, clock_id, tx64);
if (errno != ENOSYS)
return ret;
if (tx64->modes & ADJ_SETOFFSET
&& ! in_time_t_range (tx64->time.tv_sec))
{
__set_errno (EOVERFLOW);
return -1;
}
struct timex tx32 = valid_timex64_to_timex (*tx64);
int retval = INLINE_SYSCALL_CALL (clock_adjtime, clock_id, &tx32);
if (retval >= 0)
*tx64 = valid_timex_to_timex64 (tx32);
return retval;
#endif
}
#if __TIMESIZE != 64
libc_hidden_def (__clock_adjtime64)
int
__clock_adjtime (const clockid_t clock_id, struct timex *tx)
{
struct __timex64 tx64;
int retval;
tx64 = valid_timex_to_timex64 (*tx);
retval = __clock_adjtime64 (clock_id, &tx64);
if (retval >= 0)
*tx = valid_timex64_to_timex (tx64);
return retval;
}
#endif
libc_hidden_def (__clock_adjtime);
strong_alias (__clock_adjtime, clock_adjtime)