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Date: Tue, 8 Dec 2009 06:38:51 +0100 From: Ingo Molnar <mingo@...e.hu> To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> Cc: Bryan Donlan <bdonlan@...il.com>, Ulrich Drepper <drepper@...hat.com>, Timo Sirainen <tss@....fi>, WANG Cong <xiyou.wangcong@...il.com>, Oleg Nesterov <oleg@...hat.com>, LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH v6] Added PR_SET_PROCTITLE_AREA option for prctl() * KOSAKI Motohiro <kosaki.motohiro@...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: > [...] I don't want any task allow to change another task's memory > except ptrace. And i did not mean to allow 'any' task to be allowed to do this - security checks apply, obviously. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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