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Re: [PATCH v6] Avoid crash calling PrintErrMesg from efi_multiboot2


  • To: Jan Beulich <jbeulich@xxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Mon, 17 Feb 2025 16:41:03 +0000
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  • Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 17 Feb 2025 16:41:15 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 17/02/2025 4:31 pm, Jan Beulich wrote:
> On 17.02.2025 17:26, Frediano Ziglio wrote:
>> --- a/xen/common/efi/efi-common.mk
>> +++ b/xen/common/efi/efi-common.mk
>> @@ -2,6 +2,7 @@ EFIOBJ-y := boot.init.o pe.init.o ebmalloc.o runtime.o
>>  EFIOBJ-$(CONFIG_COMPAT) += compat.o
>>  
>>  CFLAGS-y += -fshort-wchar
>> +CFLAGS-y += -fno-jump-tables
>>  CFLAGS-y += -iquote $(srctree)/common/efi
>>  CFLAGS-y += -iquote $(srcdir)
> Do source files other than boot.c really need this? Do any other files outside
> of efi/ maybe also need this (iirc this point was made along with the v5 
> comment
> you got)?

Every TU reachable from efi_multiboot2() needs this, because all of
those have logic executed at an incorrect virtual address.

~Andrew



 


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