linux-kernel - Re: [PATCH] kernel 2.6.24.1 still vulnerable to the vmsplice local root exploit

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Date:	Sun, 10 Feb 2008 14:02:27 +0100
From:	"Oliver Pinter" <oliver.pntr@...il.com>
To:	"Bastian Blank" <bastian@...di.eu.org>,
	"Niki Denev" <ndenev@...il.com>, "Willy Tarreau" <w@....eu>,
	linux-kernel@...r.kernel.org, jens.axboe@...cle.com
Cc:	stable@...nel.org
Subject: Re: [PATCH] kernel 2.6.24.1 still vulnerable to the vmsplice local root exploit

thx it fixed for 2.6.22

>>>>>>>

commit f6e993b835393543bab2d917f9dea75218473edd
Author: Oliver Pinter <oliver.pntr@...il.com>
Date:   Sun Feb 10 14:03:46 2008 +0100

    [PATCH] vm: splice local root exploit fix for 2.6.22.y

    Based on Bastian Blank's patch

    Fix for CVE_2008_0009 and CVE_2008-0010

    ----->8-----

    oliver@...cs:/tmp$ ./2617_26241_root_exploit
    -----------------------------------
     Linux vmsplice Local Root Exploit
      By qaaz
      -----------------------------------
      [+] mmap: 0x0 .. 0x1000
      [+] page: 0x0
      [+] page: 0x20
      [+] mmap: 0x4000 .. 0x5000
      [+] page: 0x4000
      [+] page: 0x4020
      [+] mmap: 0x1000 .. 0x2000
      [+] page: 0x1000
      [+] mmap: 0xb7f1a000 .. 0xb7f4c000
      [-] vmsplice: Bad address

    -----8<-----

    Signed-off-by: Oliver Pinter <oliver.pntr@...il.com>

diff --git a/fs/splice.c b/fs/splice.c
index e263d3b..d8b106e 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1182,6 +1182,12 @@ static int get_iovec_page_array(const struct
iovec __user *iov,
 		if (unlikely(!base))
 			break;

+		/* CVE-2008-0009, CVE-2008-0010 fix */
+		if(!access_ok(VERIFY_READ, base, len)) {
+			error = -EFAULT;
+			break;
+		}
+
 		/*
 		 * Get this base offset and number of pages, then map
 		 * in the user pages.


<<<<<<<

On 2/10/08, Bastian Blank <bastian@...di.eu.org> wrote:
> On Sun, Feb 10, 2008 at 12:39:05PM +0000, Niki Denev wrote:
> > This patch is against 2.6.24.1 which has already the fix to
> vmsplice_to_user
> > With it i can't exploit the hole, and it is returns "invalid address"
>
> This is the vmsplice_to_pipe path and I have many reports that it is not
> fixed.
>
> Bastian
>
> --
> If there are self-made purgatories, then we all have to live in them.
> 		-- Spock, "This Side of Paradise", stardate 3417.7
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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>

oliver@...cs:/tmp$ ./2617_26241_root_exploit
-----------------------------------
 Linux vmsplice Local Root Exploit
 By qaaz
-----------------------------------
[+] mmap: 0x0 .. 0x1000
[+] page: 0x0
[+] page: 0x20
[+] mmap: 0x4000 .. 0x5000
[+] page: 0x4000
[+] page: 0x4020
[+] mmap: 0x1000 .. 0x2000
[+] page: 0x1000
[+] mmap: 0xb7f1a000 .. 0xb7f4c000
[-] vmsplice: Bad addres

-- 
Thanks,
Oliver
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