Date: Tue, 20 Jul 1999 10:54:46 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Bob Bishop <rb@gid.co.uk> Cc: "Kelly Yancey" <kbyanc@alcnet.com>, <crandall@matchlogic.com>, <freebsd-hackers@FreeBSD.ORG> Subject: Re: RE: Overcommit and calloc() Message-ID: <199907201754.KAA06018@apollo.backplane.com> References: <l0302092bb3ba6fac9d72@[194.32.164.2]>
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:Hi,
:
:At 1:28 pm -0400 20/7/99, Kelly Yancey wrote:
:>[...]
:> On recent thought though, I seem to recall having read in the 4.4BSD
:>Daemon book that having the kernel zero memory is not the preferred
:>practice, but present because when they tried to stop many progrems dies
:>which assumed memory was initialized to zero.
:
:Handing out unzeroed memory is a potential security hole.
:
:--
:Bob Bishop (0118) 977 4017 international code +44 118
:rb@gid.co.uk fax (0118) 989 4254 between 0800 and 1800 UK
It should also be noted that unless your system is entirely cpu-bound,
there is no cost to the kernel to zero memory because it pre-zero's
pages in its idle loop.
-Matt
Matthew Dillon
<dillon@backplane.com>
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