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Date: Tue, 14 Dec 2010 17:24:06 +0100 From: Oleg Nesterov <oleg@...hat.com> To: "Suzuki K. Poulose" <suzuki@...ibm.com> Cc: linux-kernel@...r.kernel.org, Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>, Christoph Hellwig <hch@....de>, Masami Hiramatsu <mhiramat@...hat.com>, Ananth N Mavinakayanahalli <ananth@...ibm.com>, Daisuke HATAYAMA <d.hatayama@...fujitsu.com>, Andi Kleen <andi@...stfloor.org>, Roland McGrath <roland@...hat.com>, Amerigo Wang <amwang@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [Patch 14/21] Create ELF header On 12/14, Suzuki K. Poulose wrote: > > +static void get_elfhdr_size(struct core_proc *cp) > +{ > + struct vm_area_struct *gate_vma; > + int segs; > + > + segs = cp->task->mm->map_count; But this is unsafe. What if cp->task was stopped when open_gencore() was called? In this case it can be killed/dead. cp->task->mm can be NULL. In fact, cp->task can point to nothing. Any usage of cp->task is not safe, afaics. Oleg. -- 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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