[edk2-devel] [edk2-platforms PATCH] Marvell/RealTimeClockLib: Allow only Unix Epoch in LibSetWakeupTime
Laszlo Ersek
lersek at redhat.com
Mon Dec 21 20:09:43 UTC 2020
Hi Marcin,
On 12/21/20 17:37, Marcin Wojtas wrote:
> Because the Armada RTC uses a 32-bit counter for seconds,
> the maximum time span is just over 136 years.
> Time is stored in Unix Epoch format, so it starts in 1970,
> Therefore it can not exceed the year 2106.
>
> The issue emerged during ACS test case, which does not pass
> Unix Epoch-relative time and caused EfiTimeToEpoch to assert.
>
> Signed-off-by: Marcin Wojtas <mw at semihalf.com>
> ---
> Silicon/Marvell/Armada7k8k/Library/RealTimeClockLib/RealTimeClockLib.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/Silicon/Marvell/Armada7k8k/Library/RealTimeClockLib/RealTimeClockLib.c b/Silicon/Marvell/Armada7k8k/Library/RealTimeClockLib/RealTimeClockLib.c
> index a811fd368e..40ab01ed41 100644
> --- a/Silicon/Marvell/Armada7k8k/Library/RealTimeClockLib/RealTimeClockLib.c
> +++ b/Silicon/Marvell/Armada7k8k/Library/RealTimeClockLib/RealTimeClockLib.c
> @@ -179,6 +179,16 @@ LibSetWakeupTime (
> {
> UINTN WakeupSeconds;
>
> + //
> + // Because the Armada RTC uses a 32-bit counter for seconds,
> + // the maximum time span is just over 136 years.
> + // Time is stored in Unix Epoch format, so it starts in 1970,
> + // Therefore it can not exceed the year 2106.
> + //
> + if ((Time->Year < 1970) || (Time->Year >= 2106)) {
> + return EFI_UNSUPPORTED;
> + }
> +
> // Convert time to raw seconds
> WakeupSeconds = EfiTimeToEpoch (Time);
> if (WakeupSeconds > MAX_UINT32) {
>
please see:
- edk2-platforms commit fbdfe8c4100d ("Silicon/Marvell/RealTimeClockLib:
make EpochSeconds, WakeupSeconds UINTN", 2020-12-21) -- part of this is
already visible in the context above,
- edk2 commit c06635ea3f4b ("EmbeddedPkg/TimeBaseLib: remove useless
truncation to 32-bit", 2020-12-21).
If you advance the edk2 submodule reference in edk2-platforms to or past
c06635ea3f4b, then the "Time->Year >= 2106" condition will be covered
already, by the (WakeupSeconds > MAX_UINT32) check.
Preventing ASSERT (JulianDate >= EPOCH_JULIAN_DATE) from firing in
EfiGetEpochDays() still makes sense, so the (Time->Year < 1970) check
can still be added usefully, I think.
Thanks
Laszlo
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#69340): https://edk2.groups.io/g/devel/message/69340
Mute This Topic: https://groups.io/mt/79129320/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-
More information about the edk2-devel-archive
mailing list