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Date: Fri, 23 Mar 2012 10:41:36 +0400 From: Cyrill Gorcunov <gorcunov@...nvz.org> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, richard -rw- weinberger <richard.weinberger@...il.com>, LKML <linux-kernel@...r.kernel.org>, Oleg Nesterov <oleg@...hat.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Pavel Emelyanov <xemul@...allels.com>, Kees Cook <keescook@...omium.org>, Tejun Heo <tj@...nel.org>, Matt Helsley <matthltc@...ibm.com> Subject: Re: [patch 1/2] c/r: prctl: Add ability to set new mm_struct::exe_file On Thu, Mar 22, 2012 at 04:38:43PM -0700, Eric W. Biederman wrote: > > > > Andrew, take a look please, will the changelog and comments look > > better? > > Can you change this to take an actual address and get the exe_file > from an mmapped area and make certain that the mmaped_area is already > mapped MAP_EXEC. > > That will prevent out-right lies. > > At least then we will know that exe_file will at least be a file that is > mapped executable in the process's address space. It's not a lot better > but it makes /proc/<pid>/exe at almost as trustable as it is now. This won't work for all cases. When we restore a program we map new VM_EXEC areas _without_ vma::vm_file field. Cyrill -- 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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