diff options
| -rw-r--r-- | arch/x86_64/mm/fault.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/x86_64/mm/fault.c b/arch/x86_64/mm/fault.c index fd07b86..2a9c836 100644 --- a/arch/x86_64/mm/fault.c +++ b/arch/x86_64/mm/fault.c @@ -237,7 +237,7 @@ static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs, } /* - * Handle a fault on the vmalloc or module mapping area + * Handle a fault on the vmalloc area * * This assumes no large pages in there. */ @@ -283,7 +283,6 @@ static int vmalloc_fault(unsigned long address) that. */ if (!pte_present(*pte) || pte_pfn(*pte) != pte_pfn(*pte_ref)) BUG(); - __flush_tlb_all(); return 0; } @@ -346,9 +345,13 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs, * protection error (error_code & 9) == 0. */ if (unlikely(address >= TASK_SIZE64)) { + /* + * Don't check for the module range here: its PML4 + * is always initialized because it's shared with the main + * kernel text. Only vmalloc may need PML4 syncups. + */ if (!(error_code & 0xd) && - ((address >= VMALLOC_START && address < VMALLOC_END) || - (address >= MODULES_VADDR && address < MODULES_END))) { + ((address >= VMALLOC_START && address < VMALLOC_END))) { if (vmalloc_fault(address) < 0) goto bad_area_nosemaphore; return; |