Date: Tue, 20 Jun 2006 21:19:01 +0200 From: Dan Lukes <dan@obluda.cz> To: Jason Evans <jasone@FreeBSD.org> Cc: freebsd-security@freebsd.org, Giorgos Keramidas <keramida@freebsd.org> Subject: Re: memory pages nulling when releasing Message-ID: <44984A25.8060001@obluda.cz> In-Reply-To: <449833DD.70904@FreeBSD.org> 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> <449833DD.70904@FreeBSD.org>
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Jason Evans napsal/wrote, On 06/20/06 19:43:
>>> BTW, Z nor J doesn't imply 'R' despite of text of manual page.
> The man page looks accurate to me. What aspect of the descriptions of
> 'J' and 'Z' do you think is incorrect?
From manual page:
=======================
J ...
This options also sets the ``R'' option.
...
Z This option implicitly sets the ``J'' and ``R'' options,
=======================
From libc/stdlib/malloc.c (the lines containing malloc_realloc + some
lines around)
=======================
static int malloc_realloc;
...
case 'r': malloc_realloc = 0; break;
case 'R': malloc_realloc = 1; break;
case 'j': malloc_junk = 0; break;
...
if (!malloc_realloc && /* Unless we have to, */
size <= osize && /* .. or are too small, ...
if (!malloc_realloc && /* Unless we have to, */
size <= osize && /* ..or are too small, */
=======================
The malloc_realloc seems to be set on one place only - when R/r
present. Then it is used only. I see no dependency to J nor Z
I send no PR because I have submitted several more important PR's which
are untouched for months. I don't want to overload committers nor PR
database.
Dan
--
Dan Lukes SISAL MFF UK
AKA: dan@obluda.cz, dan@freebsd.cz,dan@kolej.mff.cuni.cz
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