linux-kernel - [071/117] kgdb: dont needlessly skip PAGE

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Message-Id: <20100510223323.794659945@kvm.kroah.org>
Date:	Mon, 10 May 2010 15:32:42 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Wufei <fei.wu@...driver.com>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: [071/117] kgdb: dont needlessly skip PAGE_USER test for Fsl booke

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Wufei <fei.wu@...driver.com>

commit 56151e753468e34aeb322af4b0309ab727c97d2e upstream.

The bypassing of this test is a leftover from 2.4 vintage
kernels, and is no longer appropriate, or even used by KGDB.
Currently KGDB uses probe_kernel_write() for all access to
memory via the KGDB core, so it can simply be deleted.

This fixes CVE-2010-1446.

CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: Kumar Gala <galak@...nel.crashing.org>
Signed-off-by: Wufei <fei.wu@...driver.com>
Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/powerpc/mm/fsl_booke_mmu.c |    5 -----
 1 file changed, 5 deletions(-)

--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c
@@ -155,15 +155,10 @@ static void settlbcam(int index, unsigne
 	if (cur_cpu_spec->cpu_features & MMU_FTR_BIG_PHYS)
 		TLBCAM[index].MAS7 = (u64)phys >> 32;
 
-#ifndef CONFIG_KGDB /* want user access for breakpoints */
 	if (flags & _PAGE_USER) {
 	   TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
 	   TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
 	}
-#else
-	TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
-	TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0);
-#endif
 
 	tlbcam_addrs[index].start = virt;
 	tlbcam_addrs[index].limit = virt + size - 1;


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