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Date: Thu, 29 Apr 2010 10:13:18 +0800
From: Hui Zhu <>
CC: Paul Gortmaker <>,
        +security-linux <>,
        "Wessel, Jason" <>,
        Wu Fei <>
Subject: CVE request - Linux Kernel KGDB/ppc issue

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.


View attachment "0001-kgdb-don-t-needlessly-skip-PAGE_USER-test-for-Fsl-bo.patch" of type "text/x-diff" (1448 bytes)

View attachment "0002-kgdb-don-t-needlessly-skip-PAGE_USER-test.patch" of type "text/x-diff" (1439 bytes)

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