Messages in this thread | | | From | Bryan Donlan <> | Date | Tue, 8 Dec 2009 01:28:45 -0500 | Subject | Re: [PATCH v6] Added PR_SET_PROCTITLE_AREA option for prctl() |
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On Tue, Dec 8, 2009 at 12:38 AM, Ingo Molnar <mingo@elte.hu> wrote: > > * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote: > >> > The feature looks useful, but the choice of a prctl as an API is strange >> > - it limits us to the current task only - while the ability to set >> > arguments for another task looks a more generic (and potentially more >> > useful) solution. >> >> No. It's impossible. >> /proc/{pid}/cmdline read user process's memory. iow, this prctl() don't >> receive string, it receive virtual address itself. [...] > > it's not 'impossible' at all, you yourself mention ptrace:
If another process is going to use ptrace to inject the cmdline string into the victim's address space, it can also temporarily hijack a thread to run prctl() on its behalf...
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