[38812] in bugtraq
Re: Linux kernel ELF core dump privilege elevation
daemon@ATHENA.MIT.EDU (Greg KH)
Wed May 11 20:26:13 2005
Date: Wed, 11 May 2005 11:12:11 -0700
From: Greg KH <gregkh@suse.de>
To: security@isec.pl, linux-kernel@vger.kernel.org
Cc: full-disclosure@lists.netsys.com, bugtraq@securityfocus.com,
vulnwatch@vulnwatch.org
Message-ID: <20050511181211.GA16652@kroah.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <Pine.LNX.4.44.0505101615410.1618-100000@isec.pl>
On Wed, May 11, 2005 at 01:08:56PM +0200, Paul Starzetz wrote:
> Hi,
>
> since it became clear from the discussion in January about the uselib()
> vulnerability, that the Linux community prefers full, non-embargoed
> disclosure of kernel bugs, I release full details right now. However to
> follows at least some of the responsable disclosure rules, no exploit code will be
> released. Instead, only a proof-of-concept code is released to demonstrate
> the vulnerability.
<snip>
And here's a patch for 2.6 that is completly untested. I'll work on
testing it today and if it works, we will release a new 2.6.11.y release
with this fix in it.
thanks,
greg k-h
Subject: possibly fix Linux kernel ELF core dump privilege elevation
As noted by Paul Starzetz
references CAN-something-I-need-to-go-look-up...
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
fs/binfmt_elf.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
--- 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));
