From: Chris Wright <chris@wirex.com>
To: Junfeng Yang <yjf@stanford.edu>
Cc: linux-kernel@vger.kernel.org, mc@cs.stanford.edu
Subject: Re: [CHECKER] potential dereference of user pointer errors
Date: Fri, 21 Mar 2003 16:32:54 -0800 [thread overview]
Message-ID: <20030321163254.E646@figure1.int.wirex.com> (raw)
In-Reply-To: <Pine.GSO.4.44.0303202226230.24869-100000@elaine24.Stanford.EDU>; from yjf@stanford.edu on Thu, Mar 20, 2003 at 10:33:45PM -0800
* Junfeng Yang (yjf@stanford.edu) wrote:
>
> [UNKNOWN] sys_quotaoctl is a real system call. The entry point is at
> entry.S. But this file is under subdir fs. So there must be something we
> are missing
>
> /home/junfeng/linux-2.5.63/fs/block_dev.c:817:lookup_bdev: ERROR:TAINTED
> deferencing "path" tainted by [dist=1][called by
> /home/junfeng/linux-2.5.63/fs/quota.c:sys_quotactl:parm1]
Yup, this is a bug, should have a getname() in there. Patch below.
thanks,
-chris
--
Linux Security Modules http://lsm.immunix.org http://lsm.bkbits.net
===== fs/quota.c 1.12 vs edited =====
--- 1.12/fs/quota.c Sun Feb 2 13:40:31 2003
+++ edited/fs/quota.c Fri Mar 21 16:25:46 2003
@@ -221,12 +221,17 @@
uint cmds, type;
struct super_block *sb = NULL;
struct block_device *bdev;
+ char *tmp;
int ret = -ENODEV;
cmds = cmd >> SUBCMDSHIFT;
type = cmd & SUBCMDMASK;
- bdev = lookup_bdev(special);
+ tmp = getname(special);
+ if (IS_ERR(tmp))
+ return PTR_ERR(tmp);
+ bdev = lookup_bdev(tmp);
+ putname(tmp);
if (IS_ERR(bdev))
return PTR_ERR(bdev);
sb = get_super(bdev);
next prev parent reply other threads:[~2003-03-22 0:23 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-04 11:12 [CHECKER] potential races in kernel/*.c mm/*.c net/*ipv4*.c Dawson Engler
2003-03-04 12:24 ` Hugh Dickins
2003-03-04 13:23 ` Martin Josefsson
2003-03-21 6:33 ` [CHECKER] potential dereference of user pointer errors Junfeng Yang
2003-03-21 21:44 ` Chris Wright
2003-03-21 21:58 ` Junfeng Yang
2003-03-21 22:06 ` Chris Wright
2003-03-21 22:08 ` Junfeng Yang
2003-03-21 22:15 ` Chris Wright
2003-03-22 20:49 ` Alan Cox
2003-03-22 20:19 ` Chris Wright
2003-03-21 23:55 ` Chris Wright
2003-03-27 8:07 ` Jan Kasprzak
2003-03-27 17:10 ` Chris Wright
2003-04-21 7:49 ` [CHECKER] Help Needed! Junfeng Yang
2003-04-21 21:26 ` Chris Wright
2003-04-26 2:18 ` [CHECKER] 30 potential dereference of user-pointer errors Junfeng Yang
2003-04-27 9:26 ` James Morris
2003-04-28 1:55 ` Junfeng Yang
2003-04-27 20:18 ` Nick Holloway
2003-04-27 21:14 ` Junfeng Yang
2003-04-27 21:29 ` Junfeng Yang
2003-04-28 6:43 ` [CHECKER] 3 potential user-pointer errors in drivers/usb/serial that can print out arbitrary kernel data Junfeng Yang
2003-04-29 7:25 ` Greg KH
2003-04-29 9:14 ` Junfeng Yang
2003-04-28 6:50 ` [CHECKER] 8 potential user-pointer errors that allow arbitrary writes to kernel Junfeng Yang
2003-04-28 12:49 ` Alan Cox
2003-04-28 19:11 ` Junfeng Yang
2003-04-29 0:02 ` [CHECKER] 5 potential user-pointer errors in write_proc Junfeng Yang
2003-04-29 7:26 ` [CHECKER] 30 potential dereference of user-pointer errors Greg KH
2003-03-22 0:15 ` [CHECKER] potential dereference of user pointer errors Chris Wright
2003-03-22 0:32 ` Greg KH
2003-03-22 0:47 ` Chris Wright
2003-03-22 1:00 ` Greg KH
2003-03-22 0:32 ` Chris Wright [this message]
2003-03-23 23:10 ` Junfeng Yang
2003-03-24 0:24 ` [CHECKER] 63 potential calling blocking functions with locks held errors Junfeng Yang
2003-03-24 12:35 ` [CHECKER] 8 potential calling blocking kmalloc(GFP_KERNEL) " Junfeng Yang
2003-03-24 0:29 ` [CHECKER] 1 potential double unlock error Junfeng Yang
2003-03-24 9:07 ` [CHECKER] potential dereference of user pointer errors Jaroslav Kysela
2003-03-24 22:28 ` Raja R Harinath
2003-03-25 0:44 ` David S. Miller
2003-03-25 18:52 ` Raja R Harinath
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