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Subjectproblems with changing UID/GID

POSIX states that the credentials (uid, gid, capabilities, etc.) are
process-wide. So when one thread within the process changes some part
of the credentials, all threads see the change.

But, the credentials are per-task in Linux, so it's possible to have
two tasks in a process running under different UIDs.

It may have problems when we change UID/GID in one task within the
thread group.

How to deal with it? Will Linux kernel move credentials into a shared

Thank you.

Best Regards,
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