Re: [PATCH] exec: redzone page zero before loading anything

[Samuel Thibault]

Justus Winter, le Mon 22 Sep 2014 18:30:24 +0200, a écrit :
> This prevents load_section from mapping any sections to page zero.

Ack.

> * exec/exec.c (do_exec): Redzone page zero before loading anything.
> ---
>  exec/exec.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/exec/exec.c b/exec/exec.c
> index 2fc1e44..0ecf2d3 100644
> --- a/exec/exec.c
> +++ b/exec/exec.c
> @@ -1116,6 +1116,16 @@ do_exec (file_t file,
>       mach_port_destroy (oldtask, destroynames[i]);
>      }
>  
> +  /* Map page zero redzoned.  */
> +  {
> +    vm_address_t addr = 0;
> +    e.error = vm_map (newtask,
> +                   &addr, vm_page_size, 0, 0, MACH_PORT_NULL, 0, 1,
> +                   VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);
> +    if (e.error)
> +      goto out;
> +  }
> +
>  /* XXX this should be below
>     it is here to work around a vm_map kernel bug. */
>    if (interp.file != MACH_PORT_NULL)
> -- 
> 2.1.0
> 

-- 
Samuel
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