linux-kernel - Re: [PATCH] kdump: Fix exported size of vmcoreinfo note

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Message-ID: <20140114193508.GM3096@redhat.com>
Date:	Tue, 14 Jan 2014 14:35:08 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Kexec Mailing List <kexec@...ts.infradead.org>,
	Greg KH <greg@...ah.com>
Subject: Re: [PATCH] kdump: Fix exported size of vmcoreinfo note

CCed to old mail id of Greg. Fixing it.

On Tue, Jan 14, 2014 at 02:33:11PM -0500, Vivek Goyal wrote:
> Right now we seem to be exporting the max data size contained inside
> vmcoreinfo note. But this does not include the size of meta data around
> vmcore info data. Like name of the note and starting and ending elf_note.
> 
> I think user space expects total size and that size is put in PT_NOTE
> elf header. Things seem to be fine so far because we are not using
> vmcoreinfo note to the maximum capacity. But as it starts filling up,
> to capacity, at some point of time, problem will be visible.
> 
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
> ---
>  kernel/ksysfs.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6/kernel/ksysfs.c
> ===================================================================
> --- linux-2.6.orig/kernel/ksysfs.c	2014-01-14 14:09:42.107767503 -0500
> +++ linux-2.6/kernel/ksysfs.c	2014-01-14 14:15:24.385510314 -0500
> @@ -126,7 +126,7 @@ static ssize_t vmcoreinfo_show(struct ko
>  {
>  	return sprintf(buf, "%lx %x\n",
>  		       paddr_vmcoreinfo_note(),
> -		       (unsigned int)vmcoreinfo_max_size);
> +		       (unsigned int)sizeof(vmcoreinfo_note));
>  }
>  KERNEL_ATTR_RO(vmcoreinfo);
>  
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