Date: Fri, 30 Apr 2010 08:44:55 +0800 From: Eugene Teo <eugene@...hat.com> To: oss-security@...ts.openwall.com CC: Hui Zhu <hui.zhu@...driver.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, +security-linux <security-linux@...driver.com>, "Wessel, Jason" <jason.wessel@...driver.com>, Wu Fei <fei.wu@...driver.com> Subject: Re: CVE request - Linux Kernel KGDB/ppc issue On 04/29/2010 10:13 AM, Hui Zhu wrote: > Hi All, > > The problem is that if KGDB is enabled on a powerpc board, a > test that checks if a page is user or kernel is bypassed. > This means that a user can write to arbitrary kernel address space. > > Upon further investigation, we found that kernels older than > the v2.6.30-rc1 release have the same problem for non-booke > ppc chips (74xx, 8641D), so we need two patches for kernels > up to that date, and then one patch for ones after that date. http://email@example.com/msg30044.html Sun, 01 Mar 2009 22:25:03 -0800 "Note: While at it, I removed a non-sensical statement related to CONFIG_KGDB in ppc_mmu_32.c which could cause kernel mappings to be user accessible when that option is enabled. Probably something that bitrot." Eugene
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