lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Tue, 19 Nov 2013 23:09:29 +1100 From: Dave Chinner <david@...morbit.com> To: Christoph Hellwig <hch@...radead.org>, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, xfs@....sgi.com Subject: Re: [BUG] ext2/3/4: dio reads stale data when we do some append dio writes On Tue, Nov 19, 2013 at 07:51:22PM +0800, Zheng Liu wrote: > On Tue, Nov 19, 2013 at 03:18:26AM -0800, Christoph Hellwig wrote: > > On Tue, Nov 19, 2013 at 07:19:47PM +0800, Zheng Liu wrote: > > > Yes, I know that XFS has a shared/exclusive lock. I guess that is why > > > it can pass the test. But another question is why xfs fails when we do > > > some append dio writes with doing buffered read. > > > > Can you provide a test case for that issue? > > Simple. Reader just need to open this file without O_DIRECT flag. I > paste the full code snippet below. Please take care of this line: > readfd = open(argv[1], /*O_DIRECT|*/O_RDONLY, S_IRWXU); > > The result of this program on my own sand box looks like below: > encounter an error: offset 0 .... > if (ret >= 0) { > for (j = 0; j < ret; j++) { > if (rbuf[i] != 'a') { > fprintf(stderr, "encounter an error: offset %ld\n", > i); > goto err; Should be checking rbuf[j], perhaps? Cheers, Dave. -- Dave Chinner david@...morbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists