From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx180.postini.com [74.125.245.180]) by kanga.kvack.org (Postfix) with SMTP id B733A6B0044 for ; Mon, 2 Apr 2012 05:46:08 -0400 (EDT) Received: by bkwq16 with SMTP id q16so2637110bkw.14 for ; Mon, 02 Apr 2012 02:46:07 -0700 (PDT) Message-ID: <4F79755B.3030703@openvz.org> Date: Mon, 02 Apr 2012 13:46:03 +0400 From: Konstantin Khlebnikov MIME-Version: 1.0 Subject: Re: [PATCH 6/7] mm: kill vma flag VM_EXECUTABLE References: <20120331091049.19373.28994.stgit@zurg> <20120331092929.19920.54540.stgit@zurg> <20120331201324.GA17565@redhat.com> <20120331203912.GB687@moon> In-Reply-To: <20120331203912.GB687@moon> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Cyrill Gorcunov Cc: Oleg Nesterov , "linux-mm@kvack.org" , Andrew Morton , "linux-kernel@vger.kernel.org" , Eric Paris , "linux-security-module@vger.kernel.org" , "oprofile-list@lists.sf.net" , Matt Helsley , Linus Torvalds , Al Viro Cyrill Gorcunov wrote: > On Sat, Mar 31, 2012 at 10:13:24PM +0200, Oleg Nesterov wrote: >> >> Add Cyrill. This conflicts with >> c-r-prctl-add-ability-to-set-new-mm_struct-exe_file.patch in -mm. > > Thanks for CC'ing, Oleg. I think if thise series go in it won't > be a problem to update my patch accordingly. In this patch I leave mm->exe_file lockless. After exec/fork we can change it only for current task and only if mm->mm_users == 1. something like this: task_lock(current); if (atomic_read(¤t->mm->mm_users) == 1) set_mm_exe_file(current->mm, new_file); else ret = -EBUSY; task_unlock(current); task_lock() protect this code against get_task_mm() -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org