On 2023-09-02 04:18, Bruno Haible wrote:
> chmod fails with EACCES, hence per POSIX
> <https://pubs.opengroup.org/onlinepubs/9699919799/functions/chmod.html>
> it's buggy.

Thanks, I reported the bug with chmod, chown, etc. to the linux-cifs 
mailing list, here:

https://lore.kernel.org/linux-cifs/fe8ab586-c697-583b-650d-3adac64df7b2@cs.ucla.edu/T/#u

I did some testing with fsetxattr and found that it has a similar issue 
even with ext4; for example, setxattr("/", "a", "b", 1, 0) fails with 
EACCES. This is not a POSIX violation, since POSIX lacks setxattr. 
However it's bad form. And it means coreutils needs the attached 
workaround not just for CIFS, but also for ext4 in some (rare) cases.

I installed the attached workaround on coreutils and am closing the bug 
report. Thanks again for mentioning it.