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Re: [PATCH v4 1/3] kexec: Move vmcoreinfo out of the kernel's .bss section

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On 20/04/17 13:39, Xunlei Pang wrote:
> As Eric said,
> "what we need to do is move the variable vmcoreinfo_note out
> of the kernel's .bss section.  And modify the code to regenerate
> and keep this information in something like the control page.
> 
> Definitely something like this needs a page all to itself, and ideally
> far away from any other kernel data structures.  I clearly was not
> watching closely the data someone decided to keep this silly thing
> in the kernel's .bss section."
> 
> This patch allocates extra pages for these vmcoreinfo_XXX variables,
> one advantage is that it enhances some safety of vmcoreinfo, because
> vmcoreinfo now is kept far away from other kernel data structures.
> 
> Suggested-by: Eric Biederman <ebiederm@xmission.com>
> Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
> Cc: Juergen Gross <jgross@suse.com>
> Signed-off-by: Xunlei Pang <xlpang@redhat.com>

Xen parts: Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen

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[PATCH v4 1/3] kexec: Move vmcoreinfo out of the kernel's .bss section Xunlei Pang <xlpang@redhat.com> - 2017-04-20 13:50 +0200
  [PATCH v4 2/3] powerpc/fadump: Use the correct VMCOREINFO_NOTE_SIZE for phdr Xunlei Pang <xlpang@redhat.com> - 2017-04-20 13:50 +0200
    Re: [PATCH v4 2/3] powerpc/fadump: Use the correct  VMCOREINFO_NOTE_SIZE for phdr Xunlei Pang <xpang@redhat.com> - 2017-04-21 03:00 +0200
  [PATCH v4 3/3] kdump: Protect vmcoreinfo data under the crash memory Xunlei Pang <xlpang@redhat.com> - 2017-04-20 13:50 +0200
  Re: [PATCH v4 1/3] kexec: Move vmcoreinfo out of the kernel's .bss  section Juergen Gross <jgross@suse.com> - 2017-04-20 16:30 +0200
  Re: [PATCH v4 1/3] kexec: Move vmcoreinfo out of the kernel's .bss  section Michael Holzheu <holzheu@linux.vnet.ibm.com> - 2017-04-24 17:20 +0200

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