HHello everyone,

My BSP still uses an older version of Linux and libc with a 32-bit time_t.

While migrating to ptxdist-2025.01.0, I encountered an unexpected crash in
the ntpd service. Specifically, when the BSP acts as an ntpd server, the
crash occurs on the client side.

After investigating the issue, I believe I have identified a bug. On my
system, time_t is effectively an int32_t. In the function that converts a
double to the NTP time format, I found the following code:

double d;
uint32_t intl;
intl = (uint32_t)(time_t)d;

Here, the integer part of d represents the number of seconds since
1900-01-01T00:00:00.0, which exceeds 31 bits.

Casting d to time_t in the server truncates the value to 0x7fffffff,
leading to a crash in the client.

The solution is to avoid the cast to time_t when sizeof(time_t) == 4.

I have attached a proposed patch for this issue. If someone with more
authority in the project could report this upstream, that would be
appreciated.

Best regards,

Ruggero