libc6 2.2.1 malloc() bug

["Nick Holgate" <holgate@debian.org>]

I have just setup a chroot woody installation and have found that the
hostname utility fails with a seg fault.

sparks:/# hostname
(null)
sparks:/# hostname -f
Segmentation fault

After a little investigation I have tracked it down to the first call to
malloc() always setting errno even when it succeeds. The hostname utility
relies on errno remaining zero  after a successful malloc().

Here is a little test program:

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

int
main
(	int	argc,
	char	*argv[]
)
{	char	*p;

	errno = 0;
	p     = malloc(128);

	printf("1st malloc %s - errno = %d\n",
		(p == NULL) ? "failed" : "succeeded",
		errno
	);

	errno = 0;
	p     = malloc(128);

	printf("2nd malloc %s - errno = %d\n",
		(p == NULL) ? "failed" : "succeeded",
		errno
	);
}

This is what it produced:

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err:
uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-==========================================
==
ii  libc6          2.1.3-13       GNU C Library: Shared libraries and
Timezone

1st malloc succeeded - errno = 0
2nd malloc succeeded - errno = 0

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err:
uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-==========================================
==
ii  libc6          2.2.1-1        GNU C Library: Shared libraries and
Timezone

1st malloc succeeded - errno = 38
2nd malloc succeeded - errno = 0


Sorry just a report, no fix.

Nick

----------------------------------------------------------------
Nick Holgate <holgate@debian.org>
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