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efi: Check EFI revision in setup_efi_vars

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We need to check the runtime sys_table for the EFI version the firmware
specifies instead of just checking for a NULL QueryVariableInfo.  Older
implementations of EFI don't have QueryVariableInfo but the runtime is
a smaller structure, so the pointer to it may be pointing off into garbage.

This is apparently the case with several Apple firmwares that support EFI
1.10, and the current check causes them to no longer boot.  Fix based on
a suggestion from Matthew Garrett.

Signed-off-by: Josh Boyer <jwboyer@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Josh Boyer 2013-04-24 11:16:52 -04:00 committed by Matt Fleming
parent 51f8fbba64
commit f697036b93
1 changed files with 1 additions and 1 deletions
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2
arch/x86/boot/compressed/eboot.c
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@ -258,7 +258,7 @@ static efi_status_t setup_efi_vars(struct boot_params *params)
u64 store_size, remaining_size, var_size;
efi_status_t status;
if (!sys_table->runtime->query_variable_info)
if (sys_table->runtime->hdr.revision < EFI_2_00_SYSTEM_TABLE_REVISION)
return EFI_UNSUPPORTED;
data = (struct setup_data *)(unsigned long)params->hdr.setup_data;