Re: [Cent OS 4.3] Bug in do_execve().

[Hirokazu Takahashi]

Hi,

The current do_execve() doesn't have the bug.
You should let CentOS team know the bug instead.

> Hello.
> 
> Kernel 2.6.9 has a bug that forgets to undo open_exec() in do_execve().
> This bug was fixed in 2.6.10.
> 
> I noticed this bug remains in kernel-2.6.9-34.EL.src.rpm for Cent OS.
> Distributors who use 2.6.9-based kernels, please check this.
> 
> ---------- Start of patch ----------
> --- before/exec.c	2006-04-10 11:34:58.000000000 +0900
> +++ after/exec.c	2006-04-10 13:04:51.000000000 +0900
> @@ -1168,8 +1168,11 @@ int do_execve(char * filename,
>  
>  	retval = -ENOMEM;
>  	bprm = kmalloc(sizeof(*bprm), GFP_KERNEL);
> -	if (!bprm)
> +	if (!bprm) {
> +		allow_write_access(file);
> +		fput(file);
>  		goto out_ret;
> +	}
>  	memset(bprm, 0, sizeof(*bprm));
>  
>  	bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
> ---------- End of patch ----------
> 
> Regards.

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