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Date: Wed, 20 Oct 2010 10:09:30 -0400 From: "John Stoffel" <john@...ffel.org> To: Al Viro <viro@...IV.linux.org.uk> Cc: John Stoffel <john@...ffel.org>, Mimi Zohar <zohar@...ux.vnet.ibm.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org, linux-fsdevel@...r.kernel.org, hch@...radead.org, Mimi Zohar <zohar@...ibm.com>, warthog9@...nel.org, david@...morbit.com, jmorris@...ei.org, kyle@...artin.ca, hpa@...or.com, akpm@...ux-foundation.org, mingo@...e.hu Subject: Re: [PATCH 1/3] IMA: move read/write counters into struct inode >>>>> "Al" == Al Viro <viro@...IV.linux.org.uk> writes: Al> On Wed, Oct 20, 2010 at 09:10:27AM -0400, John Stoffel wrote: >> Does this mean I can't replace /bin/sh on a running system using IMA >> at all, even if just one process has it opened and is running? So how >> the hell am I supposed to do live upgrades on a system? Al> rename(2). Prohibition against write(2) to binary being executed is Al> *old*. Try to do the following: Al> cp /bin/sh /tmp Al> /tmp/sh & Al> cat /bin/ls >/tmp/sh Al> and you'll get Al> sh: /tmp/sh: Text file busy Al> That has nothing to do with IMA... Duh, makes sense. Thanks for educating me. I still IMA is a waste of system resources... John -- 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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