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kgdb: don't needlessly skip PAGE_USER test for Fsl booke

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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@kernel.crashing.org>
CC: Paul Mackerras <paulus@samba.org>
CC: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Wufei <fei.wu@windriver.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Wufei 2010-04-28 17:42:32 -04:00 committed by Jason Wessel
parent 79dba2eaa7
commit 56151e7534
1 changed files with 0 additions and 5 deletions
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5
arch/powerpc/mm/fsl_booke_mmu.c
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@ -155,15 +155,10 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
if (cur_cpu_spec->cpu_features & MMU_FTR_BIG_PHYS) if (cur_cpu_spec->cpu_features & MMU_FTR_BIG_PHYS)
TLBCAM[index].MAS7 = (u64)phys >> 32; TLBCAM[index].MAS7 = (u64)phys >> 32;
#ifndef CONFIG_KGDB /* want user access for breakpoints */
if (flags & _PAGE_USER) { if (flags & _PAGE_USER) {
TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR; TLBCAM[index].MAS3 |= MAS3_UX | MAS3_UR;
TLBCAM[index].MAS3 |= ((flags & _PAGE_RW) ? MAS3_UW : 0); 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].start = virt;
tlbcam_addrs[index].limit = virt + size - 1; tlbcam_addrs[index].limit = virt + size - 1;