bugtraq - Re: Linux kernel ELF core dump privilege elevation

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Date: Wed, 11 May 2005 23:51:21 +0200 (CEST)
From: Paul Starzetz <ihaquer@...c.pl>
To: Greg KH <gregkh@...e.de>
Cc: security@...c.pl, <linux-kernel@...r.kernel.org>,
	<full-disclosure@...ts.netsys.com>, <bugtraq@...urityfocus.com>,
	<vulnwatch@...nwatch.org>
Subject: Re: Linux kernel ELF core dump privilege elevation


On Wed, 11 May 2005, Greg KH wrote:

that seems ok.

> --- gregkh-2.6.orig/fs/binfmt_elf.c	2005-05-11 00:03:45.000000000 -0700
> +++ gregkh-2.6/fs/binfmt_elf.c	2005-05-11 00:09:17.000000000 -0700
> @@ -251,7 +251,7 @@
>  	}
>  
>  	/* Populate argv and envp */
> -	p = current->mm->arg_start;
> +	p = current->mm->arg_end = current->mm->arg_start;
>  	while (argc-- > 0) {
>  		size_t len;
>  		__put_user((elf_addr_t)p, argv++);
> @@ -1301,7 +1301,7 @@
>  static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
>  		       struct mm_struct *mm)
>  {
> -	int i, len;
> +	unsigned int i, len;
>  	
>  	/* first copy the parameters from user space */
>  	memset(psinfo, 0, sizeof(struct elf_prpsinfo));
> 

-- 
Paul Starzetz
iSEC Security Research
http://isec.pl/