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Re: unexpected behavior of cp and mv



On 2020-04-30 at 15:27, Alberto Sentieri wrote:

> I run tcpdump while running my simple program on both stretch and 
> buster. On stretch, x2 uses SMB (version 1, I guess) protocol, while
> on buster it uses SMB2 (version 2 or 3).
> 
> So, the problem can be solved by adding vers=1.0 to mount.cifs
> options. Any version from 2.0 and above will incur in the same
> utimensat error. I set vers to 1.0 and it worked properly.

Beware: this is a security hole. My understanding (based on experiences
in my workplace) is that the SMBv1 protocol is known to be inherently,
unfixably insecure, to the point that current Windows versions will not
speak it unless explicitly told to in an out-of-the-way and inconvenient
configuration location.

I would not consider forcing the use of SMBv1 to be a satisfactory
resolution, unless you can be 100% sure that nothing malicious will ever
be in a position to mess around here.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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