Date: Sun, 14 May 2006 11:33:38 +0200 From: Ulrich Spoerlein <uspoerlein@gmail.com> To: "Matthew D. Fuller" <fullermd@over-yonder.net> Cc: freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: INVARIANTS (was Re: RELENG_4 -> 5 -> 6: significant performance regression) Message-ID: <20060514093338.GB1025@roadrunner.informatik.uni-wuerzburg.de> In-Reply-To: <20060513160337.GG3874@over-yonder.net> References: <20060427181226.GA66431@xor.obsecurity.org> <20060428122448.K57436@atlantis.atlantis.dp.ua> <20060428182818.GA10410@xor.obsecurity.org> <20060512161836.R75964@atlantis.atlantis.dp.ua> <20060513020051.GB18438@xor.obsecurity.org> <20060513084236.W74146@atlantis.atlantis.dp.ua> <20060513143740.GA46313@xor.obsecurity.org> <20060513155232.GF3874@over-yonder.net> <20060513155826.GA47324@xor.obsecurity.org> <20060513160337.GG3874@over-yonder.net>
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--ncSAzJYg3Aa9+CRW Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Matthew D. Fuller wrote: > On Sat, May 13, 2006 at 11:58:26AM -0400 I heard the voice of > Kris Kennaway, and lo! it spake thus: > >=20 > > FYI, INVARIANTS adds checks but does not (is not supposed to) divert > > code paths. >=20 > It does at least in UMA; it does a lot of bzero()/NULL'ing out of > memory, which might hide later uninitialized-use bugs that could bite > you without it Shouldn't it write something like 0xdeadc0de or 0x0d0d0d0d to memory -- like user-land memory debugging tools do -- to catch read-before-write bugs? Ulrich Spoerlein --=20 PGP Key ID: 20FEE9DD Encrypted mail welcome! Fingerprint: AEC9 AF5E 01AC 4EE1 8F70 6CBD E76E 2227 20FE E9DD Which is worse: ignorance or apathy? Don't know. Don't care. --ncSAzJYg3Aa9+CRW Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQFEZvly524iJyD+6d0RAlwyAKCMHI4J21YtgRBRsduARhRidFtLDACgpAkr wvDec/cNcg0T0v/WrQ9ANto= =6dv7 -----END PGP SIGNATURE----- --ncSAzJYg3Aa9+CRW--
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