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SubjectRe: [PATCH v8 3/6] Uprobes: Support SDT markers having reference count (semaphore)

On 08/13/2018 06:47 PM, Oleg Nesterov wrote:
> On 08/13, Ravi Bangoria wrote:
>>> But damn, process creation (exec) is trivial. We could add a new uprobe_exec()
>>> hook and avoid delayed_uprobe_install() in uprobe_mmap().
>> I'm sorry. I didn't get this.
> Sorry for confusion...
> I meant, if only exec*( could race with _register(), we could add another uprobe
> hook which updates all (delayed) counters before return to user-mode.


>>> Afaics, the really problematic case is dlopen() which can race with _register()
>>> too, right?
>> dlopen() should internally use mmap() right? So what is the problem here? Can
>> you please elaborate.
> What I tried to say is that we can't avoid uprobe_mmap()->delayed_uprobe_install()
> because dlopen() can race with _register() too, just like exec.

Right :)


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