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Date: Sat, 23 Nov 1996 08:10:07 -0800 (PST)
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From: Poul-Henning Kamp <phk@critter.tfs.com>
Subject: Re: bin/2093: /etc/malloc.conf and AMD 
Reply-To: Poul-Henning Kamp <phk@critter.tfs.com>
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The following reply was made to PR bin/2093; it has been noted by GNATS.

From: Poul-Henning Kamp <phk@critter.tfs.com>
To: gilham@csl.sri.com
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: bin/2093: /etc/malloc.conf and AMD 
Date: Sat, 23 Nov 1996 17:05:31 +0100

 I have mailed the author of amd on this issue:
 
 To: jsp@doc.ic.ac.uk
 Subject: AMD malloc problem.
 Date: Sat, 23 Nov 1996 17:02:39 +0100
 Message-ID: <12545.848764959@critter.tfs.com>
 From: Poul-Henning Kamp <phk@critter.tfs.com>
 
 
 Hi!
 
 We have received the attached bug-report in the FreeBSD group.
 
 Basically what seems to happen is that if malloc(3) and friends,
 exhibit some nasty but legal behaviour amd falls over.
 
 What happens when you set the malloc.conf to "AJ" is that all
 allocations gets filled with the byte value 0xd0 before being
 returned from malloc() or realloc() or when returned to free()
 or realloc().
 
 This generally exposes errors where the program tacitly expects
 the memory to be zero-filled, or if memory is used after being
 freed, both of which is far more common than one would expect.
 (amongst the previous casualities we can mention fsck, ranlib,
 systat &c &c)
 
 Should you wish to try to reproduce this problem, you can easily
 use the "phkmalloc" implementation, simply by adding the file
 	ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/\
 		src/lib/libc/stdlib/malloc.c
 to the sources of amd.
 
 The manpage is
 	ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/\
 		src/lib/libc/stdlib/malloc.3
 
 I must admit that I don't know if we are up to date with amd or
 if a newer version exists, in which case I presume we tell the
 original submitter to upgrade and test it again.
 
 Thanks in advance!
 
 Poul-Henning Kamp
 The FreeBSD core-team.