> Not that the old code did either, so it's not like it's a new bug, but I
> thought I'd point it out anyway. As if we care (but you can probably
> trigger this by having an app that does
>
> munmap(NULL, TASK_SIZE);
>
> which will cause a SIGSEGV on return (because the stack doesn't exist) and
> then the core-dump should be empty.
Ok, damn you. I admit I thought of exactly this case and then glossed it
over because I didn't want to complicate the patch and discuss the arcane
justification. And I was doing a good job of repressing the memory of it
completely before you dredged it up.
> Not that I tested anythign that evil anyway, nor do I think we really care
> if it means that the gate_vma doesn't get shown in the core-dump either.
I didn't test it either. And I do sort of think the vDSO should be (the
only thing) in that case's core dump on anal principle. Now that you've
brought it up, I feel all dirty for ever having sent in code that doesn't
cover the case. (Not that we really care, since CONFIG_COMPAT_VDSO won't
actually be turned on in practice.)
Starting the loops with "vma = current->mm->mmap ?: gate_vma" should do it.
But I guess Andrew would prefer it:
static struct vm_area_struct *first_vma(struct task_struct *tsk,
struct vm_area_struct *gate_vma)
{
struct vm_area_struct *ret = tsk->mm->mmap;
if (ret)
return ret;
return gate_vma;
}
and:
for (vma = first_vma(current); vma; vma = next_vma(vma, gate_vma)) {
Thanks,
Roland
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