| 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
| ||
|
Message-Id: <1203446512.11987.36.camel@localhost.localdomain> Date: Tue, 19 Feb 2008 12:41:51 -0600 From: Adam Litke <agl@...ibm.com> To: Andy Whitcroft <apw@...dowen.org> Cc: Andrew Morton <akpm@...l.org>, Nishanth Aravamudan <nacc@...ibm.com>, William Irwin <wli@...omorphy.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] hugetlb: ensure we do not reference a surplus page after handing it to buddy Indeed. I'll take credit for this thinko... On Tue, 2008-02-19 at 18:28 +0000, Andy Whitcroft wrote: > When we free a page via free_huge_page and we detect that we are in > surplus the page will be returned to the buddy. After this we no longer > own the page. However at the end free_huge_page we clear out our mapping > pointer from page private. Even where the page is not a surplus we > free the page to the hugepage pool, drop the pool locks and then clear > page private. In either case the page may have been reallocated. BAD. > > Make sure we clear out page private before we free the page. > > Signed-off-by: Andy Whitcroft <apw@...dowen.org> Acked-by: Adam Litke <agl@...ibm.com> -- Adam Litke - (agl at us.ibm.com) IBM Linux Technology Center -- 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