Date: Fri, 10 Sep 2010 02:39:58 -0700 (PDT) From: Roland McGrath <roland@...hat.com> To: Oleg Nesterov <oleg@...hat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, oss-security@...ts.openwall.com, Solar Designer <solar@...nwall.com>, Kees Cook <kees.cook@...onical.com>, Al Viro <viro@...iv.linux.org.uk>, Neil Horman <nhorman@...driver.com>, linux-fsdevel@...r.kernel.org, pageexec@...email.hu, Brad Spengler <spender@...ecurity.net>, Eugene Teo <eugene@...hat.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Subject: Re: [PATCH 1/2] oom: don't ignore rss in nascent mm > I wonder if it makes sense to move ->cred_guard_mutex from task_struct > to signal_struct and thus make multiple-threads-inside-exec impossible. > Only one thread can win anyway. That probably makes sense. Note that cred_guard_mutex is also overloaded for ptrace_attach, so this would add some more serialization of attaches to threads in the same group. But as long as actual attachment serializes on tasklist_lock anyway, it doesn't make a material difference. (Even without that, it would presumably be the same debugger attaching serially to threads in the same group, so it wouldn't degrade anything in practice.) Thanks, Roland
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