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Date: Mon, 24 Mar 2008 17:01:02 +0100 From: Pavel Machek <pavel@....cz> To: Oleg Nesterov <oleg@...sign.ru> Cc: Andrew Morton <akpm@...ux-foundation.org>, "Eric W. Biederman" <ebiederm@...ssion.com>, Pavel Emelyanov <xemul@...nvz.org>, Stephen Smalley <sds@...ho.nsa.gov>, Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] ptrace: it is fun to strace /sbin/init Hi! > Ptracing of /sbin/init is not allowed. Of course, this is dangerous, but may > be useful. Introduce the kernel boot parameter to allow this, so that we can't > surprise some special/secured systems. > > Afaics, with the recent changes there is no kernel problems with ptracing init, > it can't lose SIGNAL_UNKILLABLE flag and be killed by accident. However, admin > should know what it does, "gdb /sbin/init 1" stops init, it can't > reap zombies It can't be killed, but you can stop it and not ever restart it. From that point on, zombies will accumulate until we OOM, right? > @@ -803,6 +803,8 @@ and is between 256 and 4096 characters. > Run specified binary instead of /sbin/init as init > process. > > + init_ptrace [KNL] Allows to ptrace init. > + No words about it being dangerous, but I believe it is. If it is not, lets do the patch, but not optional. If it is dangerous, option does not make it better. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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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