linux-kernel - Re: new module to check constant memory for corruption

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Message-ID: <87eh12hr1t.fsf@tassilo.jf.intel.com>
Date:	Sat, 12 Apr 2014 20:00:30 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Alexander.Kleinsorge@....de
Cc:	linux-kernel@...r.kernel.org
Subject: Re: new module to check constant memory for corruption

Alexander.Kleinsorge@....de writes:

> ramcheck kernel module
> new module to check constant memory for corruption
>
> detect corruption of constant kernel memory (text and data) periodically.
> runtime costs about 1..2 ms per sec (about 10 mb with 5 mb/ms),
> which is distributed over 8 (BLOCKS) time partitions (less than half
> ms per sec).
> in case of checksum (xor) error, an kernel log is posted.
> manual trigger via /proc/ramcheck is possible.
> range: kallsyms_lookup_name("_text") .. kallsyms_lookup_name("__end_rodata")


Can you explain how this works? How does it handle legal writes?

If it just checks its own memory it could be done in user space.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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