Duplicate SMB file_ids leading to Windows client cache poisoning

[Ralph Boehme]

On 12/8/21 00:18, Steven Engelhardt via samba-technical wrote:
> We would appreciate any guidance on the correct long-term resolution
> of this issue.

the function that calculated the itime from the filesystem timestamps is 
make_file_id_from_itime().

It will use the oldest one of atime, mtime or ctime. What is your 
servers's filesystem timestamp granularity?

Can you share the result of running stat cli command on files that 
triggered the issue? Or just generally share info about your filesystem 
and its timestamp granularity?

I'M thinking that maybe we should just use the current time for the 
itime as returned by clock_gettime_mono().

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba
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