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Re: lib/25367: arc4random state is shared across forks
The following reply was made to PR lib/25367; it has been noted by GNATS.
From: David Holland <dholland-bugs%netbsd.org@localhost>
Subject: Re: lib/25367: arc4random state is shared across forks
Date: Wed, 22 Aug 2012 04:06:06 +0000
On Sun, Aug 19, 2012 at 04:25:02PM +0000, David Laight wrote:
> Optimising getpid() (or having an optimised getpid() function) is one
> possibility. All that requires is for libc to zero the cached pid
> value in the child of fork().
> Although vfork() and others? may need special consideration.
I think it's ok for a vfork child to share the arc4random state with
its parent, because it'll be shared read/write rather than copied.
David A. Holland
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