oss-sec mailing list archives
Re: CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables
From: Josh Bressers <bressers () redhat com>
Date: Thu, 24 Feb 2011 15:22:32 -0500 (EST)
----- Original Message -----
On Thu, 2011-02-24 at 09:25 +0800, Eugene Teo wrote:On 02/24/2011 03:59 AM, Josh Bressers wrote:----- Original Message -----The kernel automatically evaluates partition tables of storage devices. The code for evaluating LDM partitions (in fs/partitions/ldm.c) contains a bug that allows to overflow the kernel heap. It may be possible to escalate privileges by exploiting this bug. (This bug is distinct from the LDM bug reported by Eugene Teo on 2011-02-23.) This should affect both, 2.4 and 2.6 kernel. As a prerequisite, CONFIG_LDM_PARTITION needs to be set.Can you point to a commit message or something else that is public? It's not clear how this differs from Eugene's request.As far as I can tell, it's not public yet. Timo will follow-up once his patch is accepted.The advisory Timo posted mentioned ldm_frag_add() so it's public for all practical purposes at this point: static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) { ... f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL); if (!f) { ldm_crit ("Out of memory."); return false; } ... memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size); return true; }
I would still like something along the lines of a proposed patch. I believe you folks (as you're much brighter than me), but I still don't quite grasp the difference. I suspect there is enough public information for MITRE to public a CVE though, so please use CVE-2011-1017. Thanks. -- JB
Current thread:
- CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables Timo Warns (Feb 23)
- Re: CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables Josh Bressers (Feb 23)
- Re: CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables Eugene Teo (Feb 23)
- Re: CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables Jon Oberheide (Feb 23)
- Re: CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables Josh Bressers (Feb 24)
- Re: CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables Eugene Teo (Feb 23)
- Re: CVE request: kernel: fs/partitions: Kernel heap overflow via corrupted LDM partition tables Josh Bressers (Feb 23)