oss-sec mailing list archives
Re: CVE request - kernel: cifs: Fix a kernel BUG with remote OS/2 server
From: Eugene Teo <eugeneteo () kernel sg>
Date: Wed, 30 Jun 2010 08:02:25 +0800
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.
->CountHigh was added long ago. Even v2.6.9 (rhel-4) is affected. Eugene
On 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
-- main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }
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)