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and subject line Bug#232430: libc6: strtof is completelly broken, garbage is returned
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From: Roberto Gordo Saez <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: libc6: strtof is completelly broken, garbage is returned
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Date: Thu, 12 Feb 2004 18:44:25 +0100
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Package: libc6
Version: 2.3.2.ds1-11
Severity: important
The function strtof does not work at all, it always returns garbage.
Many programs are silently broken by this bug. This small
example will return a random number, without using rand :-)
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
int main (void)
{
printf ("%f\n", strtof ("5E+2", NULL));
return 0;
}
Actually, the value returned by strtof seems to come from a pointer
freely walking through the stack; declaring a new, unused variable
sometimes makes a different value returned, like in this case:
int main (void)
{
int a;
printf ("%f\n", strtof ("5E+2", NULL));
return 0;
}
Is not Debian specific. Tested on Red Hat Advanced Server 2.1, Gentoo
and Debian Sid (powerpc and x86). Many glibc versions are affected, not
only this one. Probably there are no security implications, but still
not tested.
It is not something new:
http://mail.gnu.org/archive/html/bug-glibc/2002-03/msg00336.html
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.2
Locale: LANG=en_US, LC_CTYPE=en_US
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routines [gl
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Date: Sat, 14 Feb 2004 20:30:19 -0500
From: Daniel Jacobowitz <[EMAIL PROTECTED]>
To: Roberto Gordo Saez <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Subject: Re: Bug#232430: libc6: strtof is completelly broken, garbage is returned
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On Thu, Feb 12, 2004 at 09:20:13PM +0100, Roberto Gordo Saez wrote:
> On Thu, Feb 12, 2004 at 01:41:53PM -0500, Daniel Jacobowitz wrote:
> > [EMAIL PROTECTED]:~% gcc -g -o stof stof.c -Wall
> > stof.c: In function `main':
> > stof.c:7: warning: implicit declaration of function `strtof'
> > stof.c:7: warning: double format, different type arg (arg 2)
> >
> > Always, always use compiler warnings when looking at a problem like
> > this one.
> >
> > According to stdlib.h strtof is only available in C99 mode. If I add
> > -std=c99 the program works. If you add -D_GNU_SOURCE, it probably will
> > work then also.
> >
> > At most the man page needs a note. It does already say:
> > CONFORMING TO
> > ANSI C describes strtod, C99 describes the other two functions.
>
> I was thinking that the default C mode for gcc was C99, but now i've
> discovered that it is really a mix of C90 and C99. This default mode
> annoys me... but you are totally right here, this bug should be closed.
>
> Can you believe that two persons were looking with gdb and were doing
> some more weird and deeper tests, and none of us thought into simply
> activating the warnings? :-)
Thanks for following up! Closing the bug.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
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