Re: [PATCH] system/rtc: Fix a possible year-2038 integer overflow problem

["Daniel P. Berrangé" <berrange@redhat.com>]

On Mon, May 18, 2026 at 06:02:55PM +0200, Thomas Huth wrote:
> From: Thomas Huth <thuth@redhat.com>
> 
> rtc_realtime_clock_offset is initialized with:
> 
>   rtc_realtime_clock_offset = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) / 1000;
> 
> And QEMU_CLOCK_REALTIME might be based on gettimeofday() in certain
> cases (see get_clock_realtime() in include/qemu/timer.h). So this
> counter will exceed 32 bits in the year 2038, thus we should not
> store this value in a normal integer variable. Change it to an int64_t
> to fix the problem.
> And while we're at it, also adjust the nearby rtc_host_datetime_offset
> variable to be on the safe side in the related code.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  system/rtc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


With regards,
Daniel
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