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add patch_process_vm(). (in progress)

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This function patches specified range of specified user space even if
the range is not writable.

refs #401
This commit is contained in:
NAKAMURA Gou
2015-03-03 19:25:05 +09:00
parent 22d8d169b6
commit 2eac58aab3
3 changed files with 67 additions and 4 deletions
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9
kernel/process.c
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@ -1378,7 +1378,7 @@ static int page_fault_process_memory_range(struct process_vm *vm, struct vm_rang
ihk_mc_spinlock_lock_noirq(&vm->page_table_lock);
/*****/
ptep = ihk_mc_pt_lookup_pte(vm->page_table, (void *)fault_addr, &pgaddr, &pgsize, &p2align);
if (!(reason & PF_PROT) && ptep && !pte_is_null(ptep)
if (!(reason & (PF_PROT | PF_PATCH)) && ptep && !pte_is_null(ptep)
&& !pte_is_fileoff(ptep, pgsize)) {
if (!pte_is_present(ptep)) {
error = -EFAULT;
@ -1439,7 +1439,10 @@ static int page_fault_process_memory_range(struct process_vm *vm, struct vm_rang
}
page = phys_to_page(phys);
/*****/
if ((range->flag & VR_PRIVATE) && (!page || page_is_in_memobj(page) || page_is_multi_mapped(page))) {
if (((range->flag & VR_PRIVATE)
|| ((reason & PF_PATCH)
&& !(range->flag & VR_PROT_WRITE)))
&& (!page || page_is_in_memobj(page) || page_is_multi_mapped(page))) {
if (!(attr & PTATTR_DIRTY)) {
attr &= ~PTATTR_WRITABLE;
}
@ -1513,7 +1516,7 @@ static int do_page_fault_process_vm(struct process_vm *vm, void *fault_addr0, ui
}
if (((range->flag & VR_PROT_MASK) == VR_PROT_NONE)
|| ((reason & PF_WRITE)
|| (((reason & PF_WRITE) && !(reason & PF_PATCH))
&& !(range->flag & VR_PROT_WRITE))
|| ((reason & PF_INSTR)
&& !(range->flag & VR_PROT_EXEC))) {