Date: Sun, 10 Nov 2002 20:57:44 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: aurelien.nephtali@wanadoo.fr Cc: current@FreeBSD.ORG Subject: Re: Value 0xd0d0d0d0 ? Message-ID: <20021110.205744.31819780.imp@bsdimp.com> In-Reply-To: <20021109124930.GA1429@nebula.wanadoo.fr> References: <20021109124930.GA1429@nebula.wanadoo.fr>
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In message: <20021109124930.GA1429@nebula.wanadoo.fr>
Aurelien Nephtali <aurelien.nephtali@wanadoo.fr> writes:
: I would like to know where/when the value 0xd0d0d0d0 is assigned to a pointer ?
: Sometimes I have some pointers which have a correct value before and suddenly
: they got this odd 0xd0d0d0d0 value :/
That's a feature of FreeBSD's malloc. On free, the old memory is
overwritten with 0xd0 to preclude access after free (which is
undefined and a source of many bugs). This is a bug in your program
almost certainly.
man malloc will show you how to turn this off.
Warner
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