Re: [HACKERS] patch for memory overrun on Linux(i386)

On Sat, 21 Mar 1998, Bruce Momjian wrote:

> >
> >
> > Some things just require confirmation...can someone else (Thomas?) running
> > Linux comment on this before I apply it?  I just find it kinda unexpected
> > to see something that doesn't work for SCO doesn't work for Linux too :)
>
> On BSDI, malloc man pages says:
>
>      The allocated space is suitably aligned (after possible pointer coercion)
>      for storage of any type of object.
>
> I don't believe this is a standard, and I think Linux may not follow it.
> I think I heard somewhere they don't.  We certainly need to have this
> checked before use in a patch.
>
>
> --
> Bruce Momjian                          |  830 Blythe Avenue
> maillist@candle.pha.pa.us              |  Drexel Hill, Pennsylvania 19026
>   +  If your life is a hard drive,     |  (610) 353-9879(w)
>   +  Christ can be your backup.        |  (610) 853-3000(h)
>

From the linux man page:
 For calloc() and malloc(), the value returned is a pointer
       to the allocated memory, which is suitably aligned for any
       kind of variable, or NULL if the request fails.

       realloc() returns a pointer to the newly allocated memory,
       which is suitably aligned for any kind of variable and may
       be  different from ptr, or NULL if the request fails or if
       size was equal to 0.   If  realloc()  fails  the  original
       block is left untouched - it is not freed or moved.




Marc Zuckman
marc@fallon.classyad.com

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