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[Bug 16] malfunction of __clear_pt_page when a virtual address is accessed and at that time the corresponding PDTE is invalid: FIX large page issue

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Balazs Gerofi bgerofi@riken.jp
2013-05-10 12:40:50 +09:00
parent d5a6343dd3
commit b83083b9a2
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kernel/memory.c
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@ -385,6 +385,11 @@ static int __clear_pt_page(struct page_table *pt, void *virt, int largepage)
return 0; return 0;
} }
} }
if ((pt->entry[l2idx] & PFL2_PRESENT)) {
return -EINVAL;
}
pt = phys_to_virt(pt->entry[l2idx] & PAGE_MASK); pt = phys_to_virt(pt->entry[l2idx] & PAGE_MASK);
pt->entry[l1idx] = 0; pt->entry[l1idx] = 0;