On Thu, Jul 18, 2019 at 09:33:56PM +0000, Brooks Davis wrote: > Author: brooks > Date: Thu Jul 18 21:33:55 2019 > New Revision: 350116 > URL: https://svnweb.freebsd.org/changeset/base/350116 > > Log: > Document that setmode(3) is not thread safe. > > In some circumstances, setmode(3) may call umask(2) twice to retrieve > the current mode and then restore it. Between calls, the process will > have a umask of 0.
This race isn't especially serious, since it only occurs when security.bsd.unprivileged_proc_debug=0, but it's probably something to fix. The easiest solution would probably be to implement a getumask() syscall. -- Brooks
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