Date: Thu, 16 Mar 2017 10:24:48 -0700 From: Xin LI <delphij@gmail.com> To: Andrey Chernov <ache@freebsd.org> Cc: Steven Chamberlain <steven@pyro.eu.org>, "freebsd-security@freebsd.org" <freebsd-security@freebsd.org>, freebsd <freebsd-hackers@freebsd.org> Subject: Re: arc4random weakness Message-ID: <CAGMYy3v4f1y6SwPjj=hqJVLA=ar0aAWsK4mwMGoQV3dEKC7=iA@mail.gmail.com> In-Reply-To: <5160183b-9778-59aa-6cf9-118014a588eb@freebsd.org> References: <CAD2Ti28acbW%2BpGQR5UihECWvg9WduGmVzkVFug_2ZWRF2zyTBw@mail.gmail.com> <20170313220639.GB65190@pyro.eu.org> <20170315130615.GC25448@pyro.eu.org> <5160183b-9778-59aa-6cf9-118014a588eb@freebsd.org>
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On Wed, Mar 15, 2017 at 1:13 PM, Andrey Chernov <ache@freebsd.org> wrote: > On 15.03.2017 16:06, Steven Chamberlain wrote: >> Also it is great to see INHERIT_ZERO was added to mmap(2)! > > It is not so great. For a program which forks very often zeroing even > one page will be slowdown. It will be better and faster to implement it > as fork syscall wrapper setting single variable, as it already done for > threaded lib. I think it's exactly what it was done (and unlike a fork wrapper, the zeroing only happens on-demand, i.e. when the page is first touched). Cheers,
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