Date: Tue, 20 Jun 2006 10:43:57 -0700 From: Jason Evans <jasone@FreeBSD.org> To: Giorgos Keramidas <keramida@freebsd.org> Cc: Dan Lukes <dan@obluda.cz>, freebsd-security@freebsd.org Subject: Re: memory pages nulling when releasing Message-ID: <449833DD.70904@FreeBSD.org> In-Reply-To: <20060620170353.GB90842@gothmog.pc> References: <20060618203903.31161.qmail@web30306.mail.mud.yahoo.com> <44967861.6070509@obluda.cz> <20060620125350.10d0c9ef.nick@nickwithers.com> <44980ECC.5000607@obluda.cz> <20060620170353.GB90842@gothmog.pc>
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Giorgos Keramidas wrote: > On 2006-06-20 17:05, Dan Lukes <dan@obluda.cz> wrote: > >>>There's "Z" malloc option that's used to initialise page with zeros >>>instead of 0xd0 >> >>Difference betwen Z and J isn't the fill value only. Z apply >>for allocations of new memory (when imalloc() called); J apply >>on changes in allocated block size (e.g. realloc) and free. So >>'Z' doesn't "zero on free" but "zero on alloc". Well, things >>aren't simple as Z implies J ... >> >>BTW, Z nor J doesn't imply 'R' despite of text of manual page. > > > Are you sure? Then we should fix the manpage. > Cc'ing Jason Evans, who may be interested too. The man page looks accurate to me. What aspect of the descriptions of 'J' and 'Z' do you think is incorrect? Thanks, Jason
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