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Re: [Xen-devel] [PATCH 4/4] x86: check for multiboot{1, 2} header presence


  • To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 19 Jun 2019 12:11:43 +0100
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  • Cc: Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
  • Delivery-date: Wed, 19 Jun 2019 11:11:59 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 19/06/2019 12:02, Roger Pau Monne wrote:
> After building the hypervisor binary. Note that the check is performed
> by searching for the magic header value at the start of the binary.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> ---
> Cc: Jan Beulich <jbeulich@xxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Cc: Wei Liu <wl@xxxxxxx>
> ---
>  xen/arch/x86/Makefile | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
> index 8a8d8f060f..9bb3bf6e6c 100644
> --- a/xen/arch/x86/Makefile
> +++ b/xen/arch/x86/Makefile
> @@ -102,6 +102,9 @@ 
> syms-warn-dup-$(CONFIG_SUPPRESS_DUPLICATE_SYMBOL_WARNINGS) :=
>  $(TARGET): $(TARGET)-syms $(efi-y) boot/mkelf32
>       ./boot/mkelf32 $(notes_phdrs) $(TARGET)-syms $(TARGET) 
> $(XEN_IMG_OFFSET) \
>                      `$(NM) $(TARGET)-syms | sed -ne 's/^\([^ ]*\) . 
> __2M_rwdata_end$$/0x\1/p'`
> +     # Check for multiboot{1,2} headers
> +     od -t x4 -N 8192 $(TARGET) | grep 1badb002 > /dev/null
> +     od -t x4 -N 32768 $(TARGET) | grep e85250d6 > /dev/null

Neat solution.  Is `grep -q` portable ?

~Andrew

>  
>  ALL_OBJS := $(BASEDIR)/arch/x86/boot/built_in.o 
> $(BASEDIR)/arch/x86/efi/built_in.o $(ALL_OBJS)
>  


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