Re: [PATCH 04/10] x86: mce: fix error handling

From: Borislav Petkov
Date: Thu Jul 29 2010 - 06:17:27 EST

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Date: Thu, Jul 29, 2010 at 05:51:00AM -0400

> > IMO memmory allocation fails are dangerous in kernel mode. As it is
> > probably not exploitable because of boot time, it can destroy some
> > sensitive data like dirty disk caches those are going to be written on
> > disk.
> It's true for runtime, but not for normal boot time.
> Anyways if it happens on boot time the only thing you can do is panic,
> but someone else
> will likely panic anyways for you. Just ignoring it like your patch
> effectively does
> (because nothing will ever look at the ENOMEMs for an initcall)

Not true, initcall_debug will at least dump the -ENOMEM or the other
-E's if enabled on the cmdline. So even only for that case does the
patch make sense.

It's a whole different question whether it actually is prudent to turn
on error reporting of failed initcalls unconditionally.


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