Date: Tue, 20 Jun 2006 20:03:53 +0300 From: Giorgos Keramidas <keramida@freebsd.org> To: Dan Lukes <dan@obluda.cz>, Jason Evans <jasone@freebsd.org> Cc: freebsd-security@freebsd.org Subject: Re: memory pages nulling when releasing Message-ID: <20060620170353.GB90842@gothmog.pc> In-Reply-To: <44980ECC.5000607@obluda.cz> References: <20060618203903.31161.qmail@web30306.mail.mud.yahoo.com> <44967861.6070509@obluda.cz> <20060620125350.10d0c9ef.nick@nickwithers.com> <44980ECC.5000607@obluda.cz>
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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.
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