a9f55d0e7ed8b718641605f91553e4f150390dbd
chown() might drop the suid/sgid bit from files. hence let's chmod() after chown(). But also, let's tighten the transition a bit: before issuing chown() let's set the file mask to the minimum of the old and new access bitmask, so that at no point in time additional privs are available on the file with a non-matching ownership. Fixes: #12354
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