oss-sec mailing list archives
Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server
From: akuster <akuster () mvista com>
Date: Tue, 29 Jun 2010 20:43:39 -1000
Eugene, On 06/29/2010 02:02 PM, Eugene Teo wrote:
On 06/30/2010 12:57 AM, akuster wrote:pSMBr->CountHigh looks to have been introduce by commit 381a420f5b23cedd9e166e052a93a7f4237bd57c back in 2.6.12-rc2. So would it be said this issue has been around since then?Which tree are you using? I got: fatal: bad object 381a420f5b23cedd9e166e052a93a7f4237bd57c.
I believe it is the historical git tree. git://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git
->CountHigh was added long ago. Even v2.6.9 (rhel-4) is affected.
I don't see that in our 2.6.10 tree. - Armin
EugeneOn 06/27/2010 10:41 PM, Eugene Teo wrote:"This was known to trigger with a OS/2 server. The server sets pSMBr->CountHigh to a incorrect value even in case of normal writes. This results in 'nbytes' being computed wrongly and triggers a kernel BUG at mm/filemap.c. void iov_iter_advance(struct iov_iter *i, size_t bytes) { BUG_ON(i->count< bytes);<--- BUG here Why the server is setting 'CountHigh' is not clear but only does so after writing 64k bytes. Though this looks like the server bug, the client side crash may not be acceptable. The workaround is to mask off high 16 bits if the number of bytes written as returned by the server is greater than the bytes requested by the client." https://bugzilla.redhat.com/show_bug.cgi?id=608583 http://git.kernel.org/linus/6513a81e9325d712f1bfb9a1d7b750134e49ff18
Current thread:
- CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server Eugene Teo (Jun 28)
- Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server Josh Bressers (Jun 28)
- Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server akuster (Jun 29)
- Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server Eugene Teo (Jun 29)
- Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server akuster (Jun 30)
- Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server Eugene Teo (Jun 30)
- Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server Eugene Teo (Jun 29)