linux-kernel - Re: [PATCH 1/2] mm: Avoid putting a bad page back on the LRU

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Message-Id: <20080429143329.3a17ef91.akpm@linux-foundation.org>
Date:	Tue, 29 Apr 2008 14:33:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Russ Anderson <rja@....com>
Cc:	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	torvalds@...ux-foundation.org, tony.luck@...el.com,
	clameter@....com
Subject: Re: [PATCH 1/2] mm: Avoid putting a bad page back on the LRU

On Mon, 28 Apr 2008 14:23:58 -0500
Russ Anderson <rja@....com> wrote:

> --- test.orig/include/linux/kernel.h	2008-04-25 15:22:07.640501421 -0500
> +++ test/include/linux/kernel.h	2008-04-25 15:42:02.826266036 -0500
> @@ -412,6 +412,7 @@ struct sysinfo {
>  	unsigned long totalhigh;	/* Total high memory size */
>  	unsigned long freehigh;		/* Available high memory size */
>  	unsigned int mem_unit;		/* Memory unit size in bytes */
> +	unsigned int badpages;		/* Number of bad (PG_memerror) pages */
>  	char _f[20-2*sizeof(long)-sizeof(int)];	/* Padding: libc5 uses this.. */
>  };

eek.  sys_sysinfo() copies this structure out to userspace verbatim. 
Increasing its size by four bytes will cause memory scribbles in userspace
applications.

That's fixable by suitably adjusting sysinfo._f, but given the lack of
version information in the sysinfo struct, I'm not sure how useful this
change really is.

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