Re: [Tinycc-devel] bounds checking bug?

[kf]

On 5/10/07, Rob Landley <address@hidden> wrote:
> On Thursday 10 May 2007 7:36 am, kf wrote:
> > Hi,
> >
> > I'm having a strange problem with free() with bounds checking turned
> > on. Below is a small program that reproduces the problem. The program
> > runs just fine if I don't use -b flag. My system is FC5. I'm using Rob
> > Landley's tinycc-rl-1.0.0.tar.bz2 release.
> >
> > Here is the transcript:
>
> I don't know why some mailers insert invisible whitespace (0xc2) into emails.
> It's really annoying to cut and paste and then have to delete and recreate
> all the whitespace because the compiler barfs trying to build it...

(Hmm, no barfing here, no matter which email client I use to copy paste it....)

> > $ cat t.c
> > #include <stdlib.h>
> >
> > int     main (int argc, char **argv)
> > {
> >         char    * s;
> >         size_t  n = 1000000;
> >
> >         s = malloc (n);
> >         if (!s) { printf("Failed\n"); exit (1); }
> >         free (s);
> >
> >         return 0;
> > }
> > $ tcc -b t.c; a.out
> > Segmentation fault
>
> Worked fine for me when I just tried it.

So, no tcc's fault then?

> Wouldn't you have to go ./a.out?

No, because . happens to be in my path...

> > $ gdb a.out
> > GNU gdb Red Hat Linux (6.3.0.0-1.122rh)
> > Copyright 2004 Free Software Foundation, Inc.
> > GDB is free software, covered by the GNU General Public License, and you are
> > welcome to change it and/or distribute copies of it under certain
> conditions.
> > Type "show copying" to see the conditions.
> > There is absolutely no warranty for GDB.  Type "show warranty" for details.
> > This GDB was configured as "i386-redhat-linux-gnu"...Using host
> > libthread_db library "/lib/libthread_db.so.1".
>
> *shrug*  I haven't used windows in ages.

? I have never used windows.

> Can somebody else out there reproduce this?
>
> > What's going on? Is it me, my system or tcc -b goofing up something?
>
> Dunno.  I can't reproduce it on Ubuntu 6.06.

Thanks anyways...

kf

> Rob