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: Mon, 28 Jul 2008 13:35:04 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Eric Sandeen <sandeen@...hat.com> Cc: linux-kernel@...r.kernel.org, mhalcrow@...ibm.com, stable@...nel.org Subject: Re: [PATCH] eCryptfs - use page_alloc not kmalloc to get a page of memory On Mon, 28 Jul 2008 11:13:03 -0500 Eric Sandeen <sandeen@...hat.com> wrote: > With SLUB debugging turned on in 2.6.26, I was getting memory corruption > when testing eCryptfs. The root cause turned out to be that eCryptfs > was doing kmalloc(PAGE_CACHE_SIZE); virt_to_page() and treating that > as a nice page-aligned chunk of memory. But at least with SLUB debugging > on, this is not always true, and the page we get from virt_to_page does > not necessarily match the PAGE_CACHE_SIZE worth of memory we got from > kmalloc. > > My simple testcase was 2 loops doing "rm -f fileX; cp /tmp/fileX ." for > 2 different multi-megabyte files. With this change I no longer see > the corruption. The fix applies to both 2.6.25 and to 2.6.26 and appears to be needed in both kernel versions, so I have tagged it for backporting into both. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists